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Merge branch 'master' into revid-audio

This commit is contained in:
Trek H 2019-06-03 17:50:48 +09:30
parent e851ea228c 0da410166f
commit 3d7539c6df
48 changed files with 4117 additions and 951 deletions
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10
cmd/revid-cli/main.go
View File

@ -107,8 +107,9 @@ func handleFlags() revid.Config {
var ( var (
cpuprofile = flag.String("cpuprofile", "", "write cpu profile to `file`") cpuprofile = flag.String("cpuprofile", "", "write cpu profile to `file`")
inputPtr = flag.String("Input", "", "The input type: Raspivid, File, v4l, Audio")
inputCodecPtr = flag.String("InputCodec", "", "The codec of the input: H264, Mjpeg, PCM, ADPCM") inputCodecPtr = flag.String("InputCodec", "", "The codec of the input: H264, Mjpeg, PCM, ADPCM")
inputPtr = flag.String("Input", "", "The input type: Raspivid, File, v4l, Audio, RTSP")
rtspURLPtr = flag.String("RTSPURL", "", "The URL for an RTSP server.")
rtmpMethodPtr = flag.String("RtmpMethod", "", "The method used to send over rtmp: Ffmpeg, Librtmp") rtmpMethodPtr = flag.String("RtmpMethod", "", "The method used to send over rtmp: Ffmpeg, Librtmp")
quantizePtr = flag.Bool("Quantize", false, "Quantize input (non-variable bitrate)") quantizePtr = flag.Bool("Quantize", false, "Quantize input (non-variable bitrate)")
verbosityPtr = flag.String("Verbosity", "Info", "Verbosity: Debug, Info, Warning, Error, Fatal") verbosityPtr = flag.String("Verbosity", "Info", "Verbosity: Debug, Info, Warning, Error, Fatal")
@ -190,6 +191,8 @@ func handleFlags() revid.Config {
cfg.Input = revid.File cfg.Input = revid.File
case "Audio": case "Audio":
cfg.Input = revid.Audio cfg.Input = revid.Audio
case "RTSP":
cfg.Input = revid.RTSP
case "": case "":
default: default:
log.Log(logger.Error, pkg+"bad input argument") log.Log(logger.Error, pkg+"bad input argument")
@ -214,10 +217,6 @@ func handleFlags() revid.Config {
cfg.WriteRate = float64(*frameRatePtr) cfg.WriteRate = float64(*frameRatePtr)
} }
if len(outputs) == 0 {
cfg.Outputs = make([]uint8, 1)
}
for _, o := range outputs { for _, o := range outputs {
switch o { switch o {
case "File": case "File":
@ -248,6 +247,7 @@ func handleFlags() revid.Config {
netsender.ConfigFile = *configFilePtr netsender.ConfigFile = *configFilePtr
} }
cfg.RTSPURL = *rtspURLPtr
cfg.Quantize = *quantizePtr cfg.Quantize = *quantizePtr
cfg.Rotation = *rotationPtr cfg.Rotation = *rotationPtr
cfg.FlipHorizontal = *horizontalFlipPtr cfg.FlipHorizontal = *horizontalFlipPtr

393
codec/adpcm/adpcm.go
View File

@ -2,9 +2,6 @@
NAME NAME
adpcm.go adpcm.go
DESCRIPTION
adpcm.go contains functions for encoding/compressing pcm into adpcm and decoding/decompressing back to pcm.
AUTHOR AUTHOR
Trek Hopton <trek@ausocean.org> Trek Hopton <trek@ausocean.org>
@ -30,47 +27,25 @@ LICENSE
Reference algorithms for ADPCM compression and decompression are in part 6. Reference algorithms for ADPCM compression and decompression are in part 6.
*/ */
// Package adpcm provides functions to transcode between PCM and ADPCM.
package adpcm package adpcm
import ( import (
"bytes"
"encoding/binary" "encoding/binary"
"fmt" "fmt"
"io"
"math"
) )
// encoder is used to encode to ADPCM from PCM data. const (
// pred and index hold state that persists between calls to encodeSample and calcHead. byteDepth = 2 // We are working with 16-bit samples. TODO(Trek): make configurable.
// dest is the output buffer that implements io.writer and io.bytewriter, ie. where the encoded ADPCM data is written to. initSamps = 2 // Number of samples used to initialise the encoder.
type encoder struct { initBytes = initSamps * byteDepth
dest *bytes.Buffer headBytes = 4 // Number of bytes in the header of ADPCM.
pred int16 samplesPerEnc = 2 // Number of sample encoded at a time eg. 2 16-bit samples get encoded into 1 byte.
index int16 bytesPerEnc = samplesPerEnc * byteDepth
} compFact = 4 // In general ADPCM compresses by a factor of 4.
)
// decoder is used to decode from ADPCM to PCM data.
// pred, index, and step hold state that persists between calls to decodeSample.
// dest is the output buffer that implements io.writer and io.bytewriter, ie. where the decoded PCM data is written to.
type decoder struct {
dest *bytes.Buffer
pred int16
index int16
step int16
}
// BytesOutput will return the number of adpcm bytes that will be generated for the given pcm data
func BytesOutput(pcm int) int {
// for X pcm bytes, 2 bytes are left uncompressed, the rest is compressed by a factor of 4
// and a start index and padding byte are added.
return (pcm-2)/4 + 2 + 1 + 1
}
// PcmBS is the size of the blocks that an encoder uses.
// 'encodeBlock' will encode PcmBS bytes at a time and the output will be AdpcmBS bytes long.
const PcmBS = 1010
// AdpcmBS is the size of the blocks that a decoder uses.
// 'decodeBlock' will decode AdpcmBS bytes at a time and the output will be PcmBS bytes long.
const AdpcmBS = 256
// Table of index changes (see spec). // Table of index changes (see spec).
var indexTable = []int16{ var indexTable = []int16{
@ -94,28 +69,35 @@ var stepTable = []int16{
32767, 32767,
} }
// NewEncoder retuns a new ADPCM encoder. // Encoder is used to encode to ADPCM from PCM data.
func NewEncoder(dst *bytes.Buffer) *encoder { type Encoder struct {
e := encoder{ // dst is the destination for ADPCM-encoded data.
dest: dst, dst io.Writer
}
return &e est int16 // Estimation of sample based on quantised ADPCM nibble.
idx int16 // Index to step used for estimation.
} }
// NewDecoder retuns a new ADPCM decoder. // Decoder is used to decode from ADPCM to PCM data.
func NewDecoder(dst *bytes.Buffer) *decoder { type Decoder struct {
d := decoder{ // dst is the destination for PCM-encoded data.
step: stepTable[0], dst io.Writer
dest: dst,
} est int16 // Estimation of sample based on quantised ADPCM nibble.
return &d idx int16 // Index to step used for estimation.
step int16
}
// NewEncoder retuns a new ADPCM Encoder.
func NewEncoder(dst io.Writer) *Encoder {
return &Encoder{dst: dst}
} }
// encodeSample takes a single 16 bit PCM sample and // encodeSample takes a single 16 bit PCM sample and
// returns a byte of which the last 4 bits are an encoded ADPCM nibble. // returns a byte of which the last 4 bits are an encoded ADPCM nibble.
func (e *encoder) encodeSample(sample int16) byte { func (e *Encoder) encodeSample(sample int16) byte {
// Find difference of actual sample from encoder's prediction. // Find difference between the sample and the previous estimation.
delta := sample - e.pred delta := capAdd16(sample, -e.est)
// Create and set sign bit for nibble and find absolute value of difference. // Create and set sign bit for nibble and find absolute value of difference.
var nib byte var nib byte
@ -124,217 +106,250 @@ func (e *encoder) encodeSample(sample int16) byte {
delta = -delta delta = -delta
} }
step := stepTable[e.index] step := stepTable[e.idx]
diff := step >> 3 diff := step >> 3
var mask byte = 4 var mask byte = 4
for i := 0; i < 3; i++ { for i := 0; i < 3; i++ {
if delta > step { if delta > step {
nib |= mask nib |= mask
delta -= step delta = capAdd16(delta, -step)
diff += step diff = capAdd16(diff, step)
} }
mask >>= 1 mask >>= 1
step >>= 1 step >>= 1
} }
// Adjust predicted sample based on calculated difference.
if nib&8 != 0 { if nib&8 != 0 {
e.pred -= diff diff = -diff
} else {
e.pred += diff
} }
e.index += indexTable[nib&7] // Adjust estimated sample based on calculated difference.
e.est = capAdd16(e.est, diff)
e.idx += indexTable[nib&7]
// Check for underflow and overflow. // Check for underflow and overflow.
if e.index < 0 { if e.idx < 0 {
e.index = 0 e.idx = 0
} else if e.index > int16(len(stepTable)-1) { } else if e.idx > int16(len(stepTable)-1) {
e.index = int16(len(stepTable) - 1) e.idx = int16(len(stepTable) - 1)
} }
return nib return nib
} }
// calcHead sets the state for the Encoder by running the first sample through
// the Encoder, and writing the first sample to the Encoder's io.Writer (dst).
// It returns the number of bytes written to the Encoder's destination and the first error encountered.
func (e *Encoder) calcHead(sample []byte, pad bool) (int, error) {
// Check that we are given 1 sample.
if len(sample) != byteDepth {
return 0, fmt.Errorf("length of given byte array is: %v, expected: %v", len(sample), byteDepth)
}
n, err := e.dst.Write(sample)
if err != nil {
return n, err
}
_n, err := e.dst.Write([]byte{byte(int16(e.idx))})
if err != nil {
return n, err
}
n += _n
if pad {
_n, err = e.dst.Write([]byte{0x01})
} else {
_n, err = e.dst.Write([]byte{0x00})
}
n += _n
if err != nil {
return n, err
}
return n, nil
}
// init initializes the Encoder's estimation to the first uncompressed sample and the index to
// point to a suitable quantizer step size.
// The suitable step size is the closest step size in the stepTable to half the absolute difference of the first two samples.
func (e *Encoder) init(samples []byte) {
int1 := int16(binary.LittleEndian.Uint16(samples[:byteDepth]))
int2 := int16(binary.LittleEndian.Uint16(samples[byteDepth:initBytes]))
e.est = int1
halfDiff := math.Abs(math.Abs(float64(int1)) - math.Abs(float64(int2))/2)
closest := math.Abs(float64(stepTable[0]) - halfDiff)
var cInd int16
for i, step := range stepTable {
if math.Abs(float64(step)-halfDiff) < closest {
closest = math.Abs(float64(step) - halfDiff)
cInd = int16(i)
}
}
e.idx = cInd
}
// Write takes a slice of bytes of arbitrary length representing pcm and encodes it into adpcm.
// It writes its output to the Encoder's dst.
// The number of bytes written out is returned along with any error that occured.
func (e *Encoder) Write(b []byte) (int, error) {
// Check that pcm has enough data to initialize Decoder.
pcmLen := len(b)
if pcmLen < initBytes {
return 0, fmt.Errorf("length of given byte array must be >= %v", initBytes)
}
// Determine if there will be a byte that won't contain two full nibbles and will need padding.
pad := false
if (pcmLen-byteDepth)%bytesPerEnc != 0 {
pad = true
}
e.init(b[:initBytes])
n, err := e.calcHead(b[:byteDepth], pad)
if err != nil {
return n, err
}
// Skip the first sample and start at the end of the first two samples, then every two samples encode them into a byte of adpcm.
for i := byteDepth; i+bytesPerEnc-1 < pcmLen; i += bytesPerEnc {
nib1 := e.encodeSample(int16(binary.LittleEndian.Uint16(b[i : i+byteDepth])))
nib2 := e.encodeSample(int16(binary.LittleEndian.Uint16(b[i+byteDepth : i+bytesPerEnc])))
_n, err := e.dst.Write([]byte{byte((nib2 << 4) | nib1)})
n += _n
if err != nil {
return n, err
}
}
// If we've reached the end of the pcm data and there's a sample left over,
// compress it to a nibble and leave the first half of the byte padded with 0s.
if pad {
nib := e.encodeSample(int16(binary.LittleEndian.Uint16(b[pcmLen-byteDepth : pcmLen])))
_n, err := e.dst.Write([]byte{nib})
n += _n
if err != nil {
return n, err
}
}
return n, nil
}
// NewDecoder retuns a new ADPCM Decoder.
func NewDecoder(dst io.Writer) *Decoder {
return &Decoder{dst: dst}
}
// decodeSample takes a byte, the last 4 bits of which contain a single // decodeSample takes a byte, the last 4 bits of which contain a single
// 4 bit ADPCM nibble, and returns a 16 bit decoded PCM sample. // 4 bit ADPCM nibble, and returns a 16 bit decoded PCM sample.
func (d *decoder) decodeSample(nibble byte) int16 { func (d *Decoder) decodeSample(nibble byte) int16 {
// Calculate difference. // Calculate difference.
var diff int16 var diff int16
if nibble&4 != 0 { if nibble&4 != 0 {
diff += d.step diff = capAdd16(diff, d.step)
} }
if nibble&2 != 0 { if nibble&2 != 0 {
diff += d.step >> 1 diff = capAdd16(diff, d.step>>1)
} }
if nibble&1 != 0 { if nibble&1 != 0 {
diff += d.step >> 2 diff = capAdd16(diff, d.step>>2)
} }
diff += d.step >> 3 diff = capAdd16(diff, d.step>>3)
// Account for sign bit. // Account for sign bit.
if nibble&8 != 0 { if nibble&8 != 0 {
diff = -diff diff = -diff
} }
// Adjust predicted sample based on calculated difference. // Adjust estimated sample based on calculated difference.
d.pred += diff d.est = capAdd16(d.est, diff)
// Adjust index into step size lookup table using nibble. // Adjust index into step size lookup table using nibble.
d.index += indexTable[nibble] d.idx += indexTable[nibble]
// Check for overflow and underflow. // Check for overflow and underflow.
if d.index < 0 { if d.idx < 0 {
d.index = 0 d.idx = 0
} else if d.index > int16(len(stepTable)-1) { } else if d.idx > int16(len(stepTable)-1) {
d.index = int16(len(stepTable) - 1) d.idx = int16(len(stepTable) - 1)
} }
// Find new quantizer step size. // Find new quantizer step size.
d.step = stepTable[d.index] d.step = stepTable[d.idx]
return d.pred return d.est
} }
// calcHead sets the state for the encoder by running the first sample through // Write takes a slice of bytes of arbitrary length representing adpcm and decodes it into pcm.
// the encoder, and writing the first sample to the encoder's io.Writer (dest). // It writes its output to the Decoder's dst.
// It returns the number of bytes written to the encoder's io.Writer (dest) along with any errors. // The number of bytes written out is returned along with any error that occured.
func (e *encoder) calcHead(sample []byte) (int, error) { func (d *Decoder) Write(b []byte) (int, error) {
// Check that we are given 1 16-bit sample (2 bytes). // Initialize Decoder with first 4 bytes of b.
const sampSize = 2 d.est = int16(binary.LittleEndian.Uint16(b[:byteDepth]))
if len(sample) != sampSize { d.idx = int16(b[byteDepth])
return 0, fmt.Errorf("length of given byte array is: %v, expected: %v", len(sample), sampSize) d.step = stepTable[d.idx]
} n, err := d.dst.Write(b[:byteDepth])
intSample := int16(binary.LittleEndian.Uint16(sample))
e.encodeSample(intSample)
n, err := e.dest.Write(sample)
if err != nil {
return n, err
}
err = e.dest.WriteByte(byte(uint16(e.index)))
if err != nil {
return n, err
}
n++
err = e.dest.WriteByte(byte(0x00))
if err != nil {
return n, err
}
n++
return n, nil
}
// encodeBlock takes a slice of 1010 bytes (505 16-bit PCM samples).
// It writes encoded (compressed) bytes (each byte containing two ADPCM nibbles) to the encoder's io.Writer (dest).
// The number of bytes written is returned along with any errors.
// Note: nibbles are output in little endian order, eg. n1n0 n3n2 n5n4...
// Note: first 4 bytes are for initializing the decoder before decoding a block.
// - First two bytes contain the first 16-bit sample uncompressed.
// - Third byte is the decoder's starting index for the block, the fourth is padding and ignored.
func (e *encoder) encodeBlock(block []byte) (int, error) {
if len(block) != PcmBS {
return 0, fmt.Errorf("unsupported block size. Given: %v, expected: %v, ie. 505 16-bit PCM samples", len(block), PcmBS)
}
n, err := e.calcHead(block[0:2])
if err != nil {
return n, err
}
for i := 3; i < PcmBS; i += 4 {
nib1 := e.encodeSample(int16(binary.LittleEndian.Uint16(block[i-1 : i+1])))
nib2 := e.encodeSample(int16(binary.LittleEndian.Uint16(block[i+1 : i+3])))
err = e.dest.WriteByte(byte((nib2 << 4) | nib1))
if err != nil {
return n, err
}
n++
}
return n, nil
}
// decodeBlock takes a slice of 256 bytes, each byte after the first 4 should contain two ADPCM encoded nibbles.
// It writes the resulting decoded (decompressed) 16-bit PCM samples to the decoder's io.Writer (dest).
// The number of bytes written is returned along with any errors.
func (d *decoder) decodeBlock(block []byte) (int, error) {
if len(block) != AdpcmBS {
return 0, fmt.Errorf("unsupported block size. Given: %v, expected: %v", len(block), AdpcmBS)
}
// Initialize decoder with first 4 bytes of the block.
d.pred = int16(binary.LittleEndian.Uint16(block[0:2]))
d.index = int16(block[2])
d.step = stepTable[d.index]
n, err := d.dest.Write(block[0:2])
if err != nil { if err != nil {
return n, err return n, err
} }
// For each byte, seperate it into two nibbles (each nibble is a compressed sample), // For each byte, seperate it into two nibbles (each nibble is a compressed sample),
// then decode each nibble and output the resulting 16-bit samples. // then decode each nibble and output the resulting 16-bit samples.
for i := 4; i < AdpcmBS; i++ { // If padding flag is true (Adpcm[3]), only decode up until the last byte, then decode that separately.
twoNibs := block[i] for i := headBytes; i < len(b)-int(b[3]); i++ {
twoNibs := b[i]
nib2 := byte(twoNibs >> 4) nib2 := byte(twoNibs >> 4)
nib1 := byte((nib2 << 4) ^ twoNibs) nib1 := byte((nib2 << 4) ^ twoNibs)
firstBytes := make([]byte, 2) firstBytes := make([]byte, byteDepth)
binary.LittleEndian.PutUint16(firstBytes, uint16(d.decodeSample(nib1))) binary.LittleEndian.PutUint16(firstBytes, uint16(d.decodeSample(nib1)))
_n, err := d.dest.Write(firstBytes) _n, err := d.dst.Write(firstBytes)
n += _n n += _n
if err != nil { if err != nil {
return n, err return n, err
} }
secondBytes := make([]byte, 2) secondBytes := make([]byte, byteDepth)
binary.LittleEndian.PutUint16(secondBytes, uint16(d.decodeSample(nib2))) binary.LittleEndian.PutUint16(secondBytes, uint16(d.decodeSample(nib2)))
_n, err = d.dest.Write(secondBytes) _n, err = d.dst.Write(secondBytes)
n += _n n += _n
if err != nil { if err != nil {
return n, err return n, err
} }
} }
if b[3] == 0x01 {
return n, nil padNib := b[len(b)-1]
} samp := make([]byte, byteDepth)
binary.LittleEndian.PutUint16(samp, uint16(d.decodeSample(padNib)))
// Write takes a slice of bytes of arbitrary length representing pcm and encodes in into adpcm. _n, err := d.dst.Write(samp)
// It writes its output to the encoder's dest.
// The number of bytes written out is returned along with any error that occured.
func (e *encoder) Write(inPcm []byte) (int, error) {
numBlocks := len(inPcm) / PcmBS
n := 0
for i := 0; i < numBlocks; i++ {
block := inPcm[PcmBS*i : PcmBS*(i+1)]
_n, err := e.encodeBlock(block)
n += _n n += _n
if err != nil { if err != nil {
return n, err return n, err
} }
} }
return n, nil return n, nil
} }
// Write takes a slice of bytes of arbitrary length representing adpcm and decodes in into pcm. // capAdd16 adds two int16s together and caps at max/min int16 instead of overflowing
// It writes its output to the decoder's dest. func capAdd16(a, b int16) int16 {
// The number of bytes written out is returned along with any error that occured. c := int32(a) + int32(b)
func (d *decoder) Write(inAdpcm []byte) (int, error) { switch {
numBlocks := len(inAdpcm) / AdpcmBS case c < math.MinInt16:
n := 0 return math.MinInt16
for i := 0; i < numBlocks; i++ { case c > math.MaxInt16:
block := inAdpcm[AdpcmBS*i : AdpcmBS*(i+1)] return math.MaxInt16
_n, err := d.decodeBlock(block) default:
n += _n return int16(c)
if err != nil {
return n, err
}
} }
}
return n, nil
// EncBytes will return the number of adpcm bytes that will be generated when encoding the given amount of pcm bytes (n).
func EncBytes(n int) int {
// For 'n' pcm bytes, 1 sample is left uncompressed, the rest is compressed by a factor of 4
// and a start index and padding-flag byte are added.
// Also if there are an even number of samples, there will be half a byte of padding added to the last byte.
if n%bytesPerEnc == 0 {
return (n-byteDepth)/compFact + headBytes + 1
}
return (n-byteDepth)/compFact + headBytes
} }

14
codec/adpcm/adpcm_test.go
View File

@ -37,14 +37,13 @@ import (
// then compare the result with expected ADPCM. // then compare the result with expected ADPCM.
func TestEncodeBlock(t *testing.T) { func TestEncodeBlock(t *testing.T) {
// Read input pcm. // Read input pcm.
pcm, err := ioutil.ReadFile("../../../test/test-data/av/input/raw-voice.pcm") pcm, err := ioutil.ReadFile("../../../test/test-data/av/input/original_8kHz_adpcm_test.pcm")
if err != nil { if err != nil {
t.Errorf("Unable to read input PCM file: %v", err) t.Errorf("Unable to read input PCM file: %v", err)
} }
// Encode adpcm. // Encode adpcm.
numBlocks := len(pcm) / PcmBS comp := bytes.NewBuffer(make([]byte, 0, EncBytes(len(pcm))))
comp := bytes.NewBuffer(make([]byte, 0, AdpcmBS*numBlocks))
enc := NewEncoder(comp) enc := NewEncoder(comp)
_, err = enc.Write(pcm) _, err = enc.Write(pcm)
if err != nil { if err != nil {
@ -52,7 +51,7 @@ func TestEncodeBlock(t *testing.T) {
} }
// Read expected adpcm file. // Read expected adpcm file.
exp, err := ioutil.ReadFile("../../../test/test-data/av/output/encoded-voice.adpcm") exp, err := ioutil.ReadFile("../../../test/test-data/av/output/encoded_8kHz_adpcm_test.adpcm")
if err != nil { if err != nil {
t.Errorf("Unable to read expected ADPCM file: %v", err) t.Errorf("Unable to read expected ADPCM file: %v", err)
} }
@ -66,14 +65,13 @@ func TestEncodeBlock(t *testing.T) {
// resulting PCM with the expected decoded PCM. // resulting PCM with the expected decoded PCM.
func TestDecodeBlock(t *testing.T) { func TestDecodeBlock(t *testing.T) {
// Read adpcm. // Read adpcm.
comp, err := ioutil.ReadFile("../../../test/test-data/av/input/encoded-voice.adpcm") comp, err := ioutil.ReadFile("../../../test/test-data/av/input/encoded_8kHz_adpcm_test.adpcm")
if err != nil { if err != nil {
t.Errorf("Unable to read input ADPCM file: %v", err) t.Errorf("Unable to read input ADPCM file: %v", err)
} }
// Decode adpcm. // Decode adpcm.
numBlocks := len(comp) / AdpcmBS decoded := bytes.NewBuffer(make([]byte, 0, len(comp)*4))
decoded := bytes.NewBuffer(make([]byte, 0, PcmBS*numBlocks))
dec := NewDecoder(decoded) dec := NewDecoder(decoded)
_, err = dec.Write(comp) _, err = dec.Write(comp)
if err != nil { if err != nil {
@ -81,7 +79,7 @@ func TestDecodeBlock(t *testing.T) {
} }
// Read expected pcm file. // Read expected pcm file.
exp, err := ioutil.ReadFile("../../../test/test-data/av/output/decoded-voice.pcm") exp, err := ioutil.ReadFile("../../../test/test-data/av/output/decoded_8kHz_adpcm_test.pcm")
if err != nil { if err != nil {
t.Errorf("Unable to read expected PCM file: %v", err) t.Errorf("Unable to read expected PCM file: %v", err)
} }

95
codec/codecutil/bytescanner.go Normal file
View File

@ -0,0 +1,95 @@
/*
NAME
bytescanner.go
AUTHOR
Dan Kortschak <dan@ausocean.org>
LICENSE
This is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
// Package bytescan implements a byte-level scanner.
package codecutil
import "io"
// ByteScanner is a byte scanner.
type ByteScanner struct {
buf []byte
off int
// r is the source of data for the scanner.
r io.Reader
}
// NewByteScanner returns a scanner initialised with an io.Reader and a read buffer.
func NewByteScanner(r io.Reader, buf []byte) *ByteScanner {
return &ByteScanner{r: r, buf: buf[:0]}
}
// ScanUntil scans the scanner's underlying io.Reader until a delim byte
// has been read, appending all read bytes to dst. The resulting appended data,
// the last read byte and whether the last read byte was the delimiter.
func (c *ByteScanner) ScanUntil(dst []byte, delim byte) (res []byte, b byte, err error) {
outer:
for {
var i int
for i, b = range c.buf[c.off:] {
if b != delim {
continue
}
dst = append(dst, c.buf[c.off:c.off+i+1]...)
c.off += i + 1
break outer
}
dst = append(dst, c.buf[c.off:]...)
err = c.reload()
if err != nil {
break
}
}
return dst, b, err
}
// ReadByte is an unexported ReadByte.
func (c *ByteScanner) ReadByte() (byte, error) {
if c.off >= len(c.buf) {
err := c.reload()
if err != nil {
return 0, err
}
}
b := c.buf[c.off]
c.off++
return b, nil
}
// reload re-fills the scanner's buffer.
func (c *ByteScanner) reload() error {
n, err := c.r.Read(c.buf[:cap(c.buf)])
c.buf = c.buf[:n]
if err != nil {
if err != io.EOF {
return err
}
if n == 0 {
return io.EOF
}
}
c.off = 0
return nil
}

82
codec/codecutil/bytescanner_test.go Normal file
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@ -0,0 +1,82 @@
/*
NAME
bytescanner_test.go
DESCRIPTION
See Readme.md
AUTHOR
Dan Kortschak <dan@ausocean.org>
LICENSE
This is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package codecutil
import (
"bytes"
"reflect"
"testing"
)
type chunkEncoder [][]byte
func (e *chunkEncoder) Encode(b []byte) error {
*e = append(*e, b)
return nil
}
func (*chunkEncoder) Stream() <-chan []byte { panic("INVALID USE") }
func TestScannerReadByte(t *testing.T) {
data := []byte("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.")
for _, size := range []int{1, 2, 8, 1 << 10} {
r := NewByteScanner(bytes.NewReader(data), make([]byte, size))
var got []byte
for {
b, err := r.ReadByte()
if err != nil {
break
}
got = append(got, b)
}
if !bytes.Equal(got, data) {
t.Errorf("unexpected result for buffer size %d:\ngot :%q\nwant:%q", size, got, data)
}
}
}
func TestScannerScanUntilZero(t *testing.T) {
data := []byte("Lorem ipsum dolor sit amet, consectetur adipiscing elit,\x00 sed do eiusmod tempor incididunt ut \x00labore et dolore magna aliqua.")
for _, size := range []int{1, 2, 8, 1 << 10} {
r := NewByteScanner(bytes.NewReader(data), make([]byte, size))
var got [][]byte
for {
buf, _, err := r.ScanUntil(nil, 0x0)
got = append(got, buf)
if err != nil {
break
}
}
want := bytes.SplitAfter(data, []byte{0})
if !reflect.DeepEqual(got, want) {
t.Errorf("unexpected result for buffer zie %d:\ngot :%q\nwant:%q", size, got, want)
}
}
}

135
codec/h264/lex.go Normal file
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@ -0,0 +1,135 @@
/*
NAME
lex.go
DESCRIPTION
lex.go provides a lexer to lex h264 bytestream into access units.
AUTHOR
Dan Kortschak <dan@ausocean.org>
LICENSE
lex.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with revid in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
// lex.go provides a lexer to lex h264 bytestream into access units.
package h264
import (
"io"
"time"
"bitbucket.org/ausocean/av/codec/codecutil"
)
var noDelay = make(chan time.Time)
func init() {
close(noDelay)
}
var h264Prefix = [...]byte{0x00, 0x00, 0x01, 0x09, 0xf0}
// Lex lexes H.264 NAL units read from src into separate writes to dst with
// successive writes being performed not earlier than the specified delay.
// NAL units are split after type 1 (Coded slice of a non-IDR picture), 5
// (Coded slice of a IDR picture) and 8 (Picture parameter set).
func Lex(dst io.Writer, src io.Reader, delay time.Duration) error {
var tick <-chan time.Time
if delay == 0 {
tick = noDelay
} else {
ticker := time.NewTicker(delay)
defer ticker.Stop()
tick = ticker.C
}
const bufSize = 8 << 10
c := codecutil.NewByteScanner(src, make([]byte, 4<<10)) // Standard file buffer size.
buf := make([]byte, len(h264Prefix), bufSize)
copy(buf, h264Prefix[:])
writeOut := false
outer:
for {
var b byte
var err error
buf, b, err = c.ScanUntil(buf, 0x00)
if err != nil {
if err != io.EOF {
return err
}
break
}
for n := 1; b == 0x0 && n < 4; n++ {
b, err = c.ReadByte()
if err != nil {
if err != io.EOF {
return err
}
break outer
}
buf = append(buf, b)
if b != 0x1 || (n != 2 && n != 3) {
continue
}
if writeOut {
<-tick
_, err := dst.Write(buf[:len(buf)-(n+1)])
if err != nil {
return err
}
buf = make([]byte, len(h264Prefix)+n, bufSize)
copy(buf, h264Prefix[:])
buf = append(buf, 1)
writeOut = false
}
b, err = c.ReadByte()
if err != nil {
if err != io.EOF {
return err
}
break outer
}
buf = append(buf, b)
// http://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-H.264-200305-S!!PDF-E&type=items
// Table 7-1 NAL unit type codes
const (
nonIdrPic = 1
idrPic = 5
suppEnhInfo = 6
paramSet = 8
)
switch nalTyp := b & 0x1f; nalTyp {
case nonIdrPic, idrPic, paramSet, suppEnhInfo:
writeOut = true
}
}
}
if len(buf) == len(h264Prefix) {
return nil
}
<-tick
_, err := dst.Write(buf)
return err
}

139
codec/lex/lex_test.go → codec/h264/lex_test.go
View File

@ -3,7 +3,7 @@ NAME
lex_test.go lex_test.go
DESCRIPTION DESCRIPTION
See Readme.md lex_test.go provides tests for the lexer in lex.go.
AUTHOR AUTHOR
Dan Kortschak <dan@ausocean.org> Dan Kortschak <dan@ausocean.org>
@ -25,12 +25,11 @@ LICENSE
along with revid in gpl.txt. If not, see http://www.gnu.org/licenses. along with revid in gpl.txt. If not, see http://www.gnu.org/licenses.
*/ */
package lex // lex_test.go provides tests for the lexer in lex.go.
package h264
import ( import (
"bytes"
"reflect"
"testing"
"time" "time"
) )
@ -207,7 +206,7 @@ var h264Tests = []struct {
func TestH264(t *testing.T) { func TestH264(t *testing.T) {
for _, test := range h264Tests { for _, test := range h264Tests {
var buf chunkEncoder var buf chunkEncoder
err := H264(&buf, bytes.NewReader(test.input), test.delay) err := Lex(&buf, bytes.NewReader(test.input), test.delay)
if fmt.Sprint(err) != fmt.Sprint(test.err) { if fmt.Sprint(err) != fmt.Sprint(test.err) {
t.Errorf("unexpected error for %q: got:%v want:%v", test.name, err, test.err) t.Errorf("unexpected error for %q: got:%v want:%v", test.name, err, test.err)
} }
@ -221,131 +220,3 @@ func TestH264(t *testing.T) {
} }
} }
*/ */
var mjpegTests = []struct {
name string
input []byte
delay time.Duration
want [][]byte
err error
}{
{
name: "empty",
},
{
name: "null",
input: []byte{0xff, 0xd8, 0xff, 0xd9},
delay: 0,
want: [][]byte{{0xff, 0xd8, 0xff, 0xd9}},
},
{
name: "null delayed",
input: []byte{0xff, 0xd8, 0xff, 0xd9},
delay: time.Millisecond,
want: [][]byte{{0xff, 0xd8, 0xff, 0xd9}},
},
{
name: "full",
input: []byte{
0xff, 0xd8, 'f', 'u', 'l', 'l', 0xff, 0xd9,
0xff, 0xd8, 'f', 'r', 'a', 'm', 'e', 0xff, 0xd9,
0xff, 0xd8, 'w', 'i', 't', 'h', 0xff, 0xd9,
0xff, 0xd8, 'l', 'e', 'n', 'g', 't', 'h', 0xff, 0xd9,
0xff, 0xd8, 's', 'p', 'r', 'e', 'a', 'd', 0xff, 0xd9,
},
delay: 0,
want: [][]byte{
{0xff, 0xd8, 'f', 'u', 'l', 'l', 0xff, 0xd9},
{0xff, 0xd8, 'f', 'r', 'a', 'm', 'e', 0xff, 0xd9},
{0xff, 0xd8, 'w', 'i', 't', 'h', 0xff, 0xd9},
{0xff, 0xd8, 'l', 'e', 'n', 'g', 't', 'h', 0xff, 0xd9},
{0xff, 0xd8, 's', 'p', 'r', 'e', 'a', 'd', 0xff, 0xd9},
},
},
{
name: "full delayed",
input: []byte{
0xff, 0xd8, 'f', 'u', 'l', 'l', 0xff, 0xd9,
0xff, 0xd8, 'f', 'r', 'a', 'm', 'e', 0xff, 0xd9,
0xff, 0xd8, 'w', 'i', 't', 'h', 0xff, 0xd9,
0xff, 0xd8, 'l', 'e', 'n', 'g', 't', 'h', 0xff, 0xd9,
0xff, 0xd8, 's', 'p', 'r', 'e', 'a', 'd', 0xff, 0xd9,
},
delay: time.Millisecond,
want: [][]byte{
{0xff, 0xd8, 'f', 'u', 'l', 'l', 0xff, 0xd9},
{0xff, 0xd8, 'f', 'r', 'a', 'm', 'e', 0xff, 0xd9},
{0xff, 0xd8, 'w', 'i', 't', 'h', 0xff, 0xd9},
{0xff, 0xd8, 'l', 'e', 'n', 'g', 't', 'h', 0xff, 0xd9},
{0xff, 0xd8, 's', 'p', 'r', 'e', 'a', 'd', 0xff, 0xd9},
},
},
}
// FIXME this needs to be adapted
/*
func TestMJEG(t *testing.T) {
for _, test := range mjpegTests {
var buf chunkEncoder
err := MJPEG(&buf, bytes.NewReader(test.input), test.delay)
if fmt.Sprint(err) != fmt.Sprint(test.err) {
t.Errorf("unexpected error for %q: got:%v want:%v", test.name, err, test.err)
}
if err != nil {
continue
}
got := [][]byte(buf)
if !reflect.DeepEqual(got, test.want) {
t.Errorf("unexpected result for %q:\ngot :%#v\nwant:%#v", test.name, got, test.want)
}
}
}
*/
type chunkEncoder [][]byte
func (e *chunkEncoder) Encode(b []byte) error {
*e = append(*e, b)
return nil
}
func (*chunkEncoder) Stream() <-chan []byte { panic("INVALID USE") }
func TestScannerReadByte(t *testing.T) {
data := []byte("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.")
for _, size := range []int{1, 2, 8, 1 << 10} {
r := newScanner(bytes.NewReader(data), make([]byte, size))
var got []byte
for {
b, err := r.readByte()
if err != nil {
break
}
got = append(got, b)
}
if !bytes.Equal(got, data) {
t.Errorf("unexpected result for buffer size %d:\ngot :%q\nwant:%q", size, got, data)
}
}
}
func TestScannerScanUntilZero(t *testing.T) {
data := []byte("Lorem ipsum dolor sit amet, consectetur adipiscing elit,\x00 sed do eiusmod tempor incididunt ut \x00labore et dolore magna aliqua.")
for _, size := range []int{1, 2, 8, 1 << 10} {
r := newScanner(bytes.NewReader(data), make([]byte, size))
var got [][]byte
for {
buf, _, err := r.scanUntilZeroInto(nil)
got = append(got, buf)
if err != nil {
break
}
}
want := bytes.SplitAfter(data, []byte{0})
if !reflect.DeepEqual(got, want) {
t.Errorf("unexpected result for buffer zie %d:\ngot :%q\nwant:%q", size, got, want)
}
}
}

203
codec/h265/lex.go Normal file
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@ -0,0 +1,203 @@
/*
NAME
lex.go
DESCRIPTION
lex.go provides a lexer for taking RTP HEVC (H265) and lexing into access units.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
Copyright (C) 2019 the Australian Ocean Lab (AusOcean).
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
// Package h265 provides an RTP h265 lexer that can extract h265 access units
// from an RTP stream.
package h265
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"time"
"bitbucket.org/ausocean/av/protocol/rtp"
)
// NALU types.
const (
typeAggregation = 48
typeFragmentation = 49
typePACI = 50
)
// Buffer sizes.
const (
maxAUSize = 100000
maxRTPSize = 4096
)
// Lexer is an H265 lexer.
type Lexer struct {
donl bool // Indicates whether DONL and DOND will be used for the RTP stream.
buf *bytes.Buffer // Holds the current access unit.
frag bool // Indicates if we're currently dealing with a fragmentation packet.
}
// NewLexer returns a new Lexer.
func NewLexer(donl bool) *Lexer {
return &Lexer{
donl: donl,
buf: bytes.NewBuffer(make([]byte, 0, maxAUSize)),
}
}
// Lex continually reads RTP packets from the io.Reader src and lexes into
// access units which are written to the io.Writer dst. Lex expects that for
// each read from src, a single RTP packet is received.
func (l *Lexer) Lex(dst io.Writer, src io.Reader, delay time.Duration) error {
buf := make([]byte, maxRTPSize)
for {
n, err := src.Read(buf)
switch err {
case nil: // Do nothing.
case io.EOF:
return nil
default:
return fmt.Errorf("source read error: %v\n", err)
}
// Get payload from RTP packet.
payload, err := rtp.Payload(buf[:n])
if err != nil {
return fmt.Errorf("could not get rtp payload, failed with err: %v\n", err)
}
nalType := (payload[0] >> 1) & 0x3f
// If not currently fragmented then we ignore current write.
if l.frag && nalType != typeFragmentation {
l.buf.Reset()
l.frag = false
continue
}
switch nalType {
case typeAggregation:
l.handleAggregation(payload)
case typeFragmentation:
l.handleFragmentation(payload)
case typePACI:
l.handlePACI(payload)
default:
l.writeWithPrefix(payload)
}
markerIsSet, err := rtp.Marker(buf[:n])
if err != nil {
return fmt.Errorf("could not get marker bit, failed with err: %v\n", err)
}
if markerIsSet {
_, err := l.buf.WriteTo(dst)
if err != nil {
// TODO: work out what to do here.
}
l.buf.Reset()
}
}
return nil
}
// handleAggregation parses NAL units from an aggregation packet and writes
// them to the Lexers buffer buf.
func (l *Lexer) handleAggregation(d []byte) {
idx := 2
for idx < len(d) {
if l.donl {
switch idx {
case 2:
idx += 2
default:
idx++
}
}
size := int(binary.BigEndian.Uint16(d[idx:]))
idx += 2
nalu := d[idx : idx+size]
idx += size
l.writeWithPrefix(nalu)
}
}
// handleFragmentation parses NAL units from fragmentation packets and writes
// them to the Lexer's buf.
func (l *Lexer) handleFragmentation(d []byte) {
// Get start and end indiciators from FU header.
start := d[2]&0x80 != 0
end := d[2]&0x40 != 0
b1 := (d[0] & 0x81) | ((d[2] & 0x3f) << 1)
b2 := d[1]
if start {
d = d[1:]
if l.donl {
d = d[2:]
}
d[0] = b1
d[1] = b2
} else {
d = d[3:]
if l.donl {
d = d[2:]
}
}
switch {
case start && !end:
l.frag = true
l.writeWithPrefix(d)
case !start && end:
l.frag = false
fallthrough
case !start && !end:
l.writeNoPrefix(d)
default:
panic("bad fragmentation packet")
}
}
// handlePACI will handl PACI packets
//
// TODO: complete this
func (l *Lexer) handlePACI(d []byte) {
panic("unsupported nal type")
}
// write writes a NAL unit to the Lexer's buf in byte stream format using the
// start code.
func (l *Lexer) writeWithPrefix(d []byte) {
const prefix = "\x00\x00\x00\x01"
l.buf.Write([]byte(prefix))
l.buf.Write(d)
}
// writeNoPrefix writes data to the Lexer's buf. This is used for non start
// fragmentations of a NALU.
func (l *Lexer) writeNoPrefix(d []byte) {
l.buf.Write(d)
}

262
codec/h265/lex_test.go Normal file
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@ -0,0 +1,262 @@
/*
NAME
lex_test.go
DESCRIPTION
lex_test.go provides tests to check validity of the Lexer found in lex.go.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
Copyright (C) 2019 the Australian Ocean Lab (AusOcean).
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package h265
import (
"io"
"testing"
)
// rtpReader provides the RTP stream.
type rtpReader struct {
packets [][]byte
idx int
}
// Read implements io.Reader.
func (r *rtpReader) Read(p []byte) (int, error) {
if r.idx == len(r.packets) {
return 0, io.EOF
}
b := r.packets[r.idx]
n := copy(p, b)
if n < len(r.packets[r.idx]) {
r.packets[r.idx] = r.packets[r.idx][n:]
} else {
r.idx++
}
return n, nil
}
// destination holds the access units extracted during the lexing process.
type destination [][]byte
// Write implements io.Writer.
func (d *destination) Write(p []byte) (int, error) {
t := make([]byte, len(p))
copy(t, p)
*d = append([][]byte(*d), t)
return len(p), nil
}
// TestLex checks that the Lexer can correctly extract H265 access units from
// HEVC RTP stream in RTP payload format.
func TestLex(t *testing.T) {
const rtpVer = 2
tests := []struct {
donl bool
packets [][]byte
expect [][]byte
}{
{
donl: false,
packets: [][]byte{
{ // Single NAL unit.
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x40, 0x00, // NAL header (type=32 VPS).
0x01, 0x02, 0x03, 0x04, // NAL Data.
},
{ // Fragmentation (start packet).
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x62, 0x00, // NAL header (type49).
0x80, // FU header.
0x01, 0x02, 0x03, // FU payload.
},
{ // Fragmentation (middle packet)
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x62, 0x00, // NAL header (type 49).
0x00, // FU header.
0x04, 0x05, 0x06, // FU payload.
},
{ // Fragmentation (end packet)
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x62, 0x00, // NAL header (type 49).
0x40, // FU header.
0x07, 0x08, 0x09, // FU payload
},
{ // Aggregation. Make last packet of access unit => marker bit true.
0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x60, 0x00, // NAL header (type 49).
0x00, 0x04, // NAL 1 size.
0x01, 0x02, 0x03, 0x04, // NAL 1 data.
0x00, 0x04, // NAL 2 size.
0x01, 0x02, 0x03, 0x04, // NAL 2 data.
},
{ // Singla NAL
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x40, 0x00, // NAL header (type=32 VPS).
0x01, 0x02, 0x03, 0x04, // NAL data.
},
{ // Singla NAL. Make last packet of access unit => marker bit true.
0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x40, 0x00, // NAL header (type=32 VPS).
0x01, 0x02, 0x03, 0x04, // NAL data.
},
},
expect: [][]byte{
// First access unit.
{
// NAL 1
0x00, 0x00, 0x00, 0x01, // Start code.
0x40, 0x00, // NAL header (type=32 VPS).
0x01, 0x02, 0x03, 0x04, // NAL data.
// NAL 2
0x00, 0x00, 0x00, 0x01, // Start code.
0x00, 0x00, 0x01, 0x02, 0x03, // FU payload.
0x04, 0x05, 0x06, // FU payload.
0x07, 0x08, 0x09, // FU payload.
// NAL 3
0x00, 0x00, 0x00, 0x01, // Start code.
0x01, 0x02, 0x03, 0x04, // NAL data.
// NAL 4
0x00, 0x00, 0x00, 0x01, // Start code.
0x01, 0x02, 0x03, 0x04, // NAL 2 data
},
// Second access unit.
{
// NAL 1
0x00, 0x00, 0x00, 0x01, // Start code.
0x40, 0x00, // NAL header (type=32 VPS).
0x01, 0x02, 0x03, 0x04, // Data.
// NAL 2
0x00, 0x00, 0x00, 0x01, // Start code.
0x40, 0x00, // NAL header (type=32 VPS).
0x01, 0x02, 0x03, 0x04, // Data.
},
},
},
{
donl: true,
packets: [][]byte{
{ // Single NAL unit.
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x40, 0x00, // NAL header (type=32 VPS).
0x00, 0x00, // DONL
0x01, 0x02, 0x03, 0x04, // NAL Data.
},
{ // Fragmentation (start packet).
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x62, 0x00, // NAL header (type49).
0x80, // FU header.
0x00, 0x00, // DONL
0x01, 0x02, 0x03, // FU payload.
},
{ // Fragmentation (middle packet)
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x62, 0x00, // NAL header (type 49).
0x00, // FU header.
0x00, 0x00, // DONL
0x04, 0x05, 0x06, // FU payload.
},
{ // Fragmentation (end packet)
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x62, 0x00, // NAL header (type 49).
0x40, // FU header.
0x00, 0x00, // DONL
0x07, 0x08, 0x09, // FU payload
},
{ // Aggregation. Make last packet of access unit => marker bit true.
0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x60, 0x00, // NAL header (type 49).
0x00, 0x00, // DONL
0x00, 0x04, // NAL 1 size.
0x01, 0x02, 0x03, 0x04, // NAL 1 data.
0x00, // DOND
0x00, 0x04, // NAL 2 size.
0x01, 0x02, 0x03, 0x04, // NAL 2 data.
},
{ // Singla NAL
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x40, 0x00, // NAL header (type=32 VPS)
0x00, 0x00, // DONL.
0x01, 0x02, 0x03, 0x04, // NAL data.
},
{ // Singla NAL. Make last packet of access unit => marker bit true.
0x80, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // RTP header.
0x40, 0x00, // NAL header (type=32 VPS).
0x00, 0x00, // DONL
0x01, 0x02, 0x03, 0x04, // NAL data.
},
},
expect: [][]byte{
// First access unit.
{
// NAL 1
0x00, 0x00, 0x00, 0x01, // Start code.
0x40, 0x00, // NAL header (type=32 VPS).
0x00, 0x00, // DONL
0x01, 0x02, 0x03, 0x04, // NAL data.
// NAL 2
0x00, 0x00, 0x00, 0x01, // Start code.
0x00, 0x00, 0x01, 0x02, 0x03, // FU payload.
0x04, 0x05, 0x06, // FU payload.
0x07, 0x08, 0x09, // FU payload.
// NAL 3
0x00, 0x00, 0x00, 0x01, // Start code.
0x01, 0x02, 0x03, 0x04, // NAL data.
// NAL 4
0x00, 0x00, 0x00, 0x01, // Start code.
0x01, 0x02, 0x03, 0x04, // NAL 2 data
},
// Second access unit.
{
// NAL 1
0x00, 0x00, 0x00, 0x01, // Start code.
0x40, 0x00, // NAL header (type=32 VPS).
0x00, 0x00, // DONL
0x01, 0x02, 0x03, 0x04, // Data.
// NAL 2
0x00, 0x00, 0x00, 0x01, // Start code.
0x40, 0x00, // NAL header (type=32 VPS).
0x00, 0x00, // DONL
0x01, 0x02, 0x03, 0x04, // Data.
},
},
},
}
for testNum, test := range tests {
r := &rtpReader{packets: test.packets}
d := &destination{}
err := NewLexer(test.donl).Lex(d, r, 0)
if err != nil {
t.Fatalf("error lexing: %v\n", err)
}
for i, accessUnit := range test.expect {
for j, part := range accessUnit {
if part != [][]byte(*d)[i][j] {
t.Fatalf("did not get expected data for test: %v.\nGot: %v\nWant: %v\n", testNum, d, test.expect)
}
}
}
}
}

280
codec/lex/lex.go
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@ -1,280 +0,0 @@
/*
NAME
lex.go
AUTHOR
Dan Kortschak <dan@ausocean.org>
Trek Hopton <trek@ausocean.org>
LICENSE
lex.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with revid in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
// Package lex provides lexers for video encodings.
package lex
import (
"bufio"
"bytes"
"fmt"
"io"
"time"
)
var noDelay = make(chan time.Time)
func init() {
close(noDelay)
}
var h264Prefix = [...]byte{0x00, 0x00, 0x01, 0x09, 0xf0}
// H264 lexes H.264 NAL units read from src into separate writes to dst with
// successive writes being performed not earlier than the specified delay.
// NAL units are split after type 1 (Coded slice of a non-IDR picture), 5
// (Coded slice of a IDR picture) and 8 (Picture parameter set).
func H264(dst io.Writer, src io.Reader, delay time.Duration, bufSize int) error {
var tick <-chan time.Time
if delay == 0 {
tick = noDelay
} else {
ticker := time.NewTicker(delay)
defer ticker.Stop()
tick = ticker.C
}
bufSize = 8 << 10 //TODO(Trek): Pass this in rather than set it in here.
c := newScanner(src, make([]byte, 4<<10)) // Standard file buffer size.
buf := make([]byte, len(h264Prefix), bufSize)
copy(buf, h264Prefix[:])
writeOut := false
outer:
for {
var b byte
var err error
buf, b, err = c.scanUntilZeroInto(buf)
if err != nil {
if err != io.EOF {
return err
}
break
}
for n := 1; b == 0x0 && n < 4; n++ {
b, err = c.readByte()
if err != nil {
if err != io.EOF {
return err
}
break outer
}
buf = append(buf, b)
if b != 0x1 || (n != 2 && n != 3) {
continue
}
if writeOut {
<-tick
_, err := dst.Write(buf[:len(buf)-(n+1)])
if err != nil {
return err
}
buf = make([]byte, len(h264Prefix)+n, bufSize)
copy(buf, h264Prefix[:])
buf = append(buf, 1)
writeOut = false
}
b, err = c.readByte()
if err != nil {
if err != io.EOF {
return err
}
break outer
}
buf = append(buf, b)
// http://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-H.264-200305-S!!PDF-E&type=items
// Table 7-1 NAL unit type codes
const (
nonIdrPic = 1
idrPic = 5
suppEnhInfo = 6
paramSet = 8
)
switch nalTyp := b & 0x1f; nalTyp {
case nonIdrPic, idrPic, paramSet, suppEnhInfo:
writeOut = true
}
}
}
if len(buf) == len(h264Prefix) {
return nil
}
<-tick
_, err := dst.Write(buf)
return err
}
// scanner is a byte scanner.
type scanner struct {
buf []byte
off int
// r is the source of data for the scanner.
r io.Reader
}
// newScanner returns a scanner initialised with an io.Reader and a read buffer.
func newScanner(r io.Reader, buf []byte) *scanner {
return &scanner{r: r, buf: buf[:0]}
}
// scanUntilZeroInto scans the scanner's underlying io.Reader until a zero byte
// has been read, appending all read bytes to dst. The resulting appended data,
// the last read byte and whether the last read byte was zero are returned.
func (c *scanner) scanUntilZeroInto(dst []byte) (res []byte, b byte, err error) {
outer:
for {
var i int
for i, b = range c.buf[c.off:] {
if b != 0x0 {
continue
}
dst = append(dst, c.buf[c.off:c.off+i+1]...)
c.off += i + 1
break outer
}
dst = append(dst, c.buf[c.off:]...)
err = c.reload()
if err != nil {
break
}
}
return dst, b, err
}
// readByte is an unexported ReadByte.
func (c *scanner) readByte() (byte, error) {
if c.off >= len(c.buf) {
err := c.reload()
if err != nil {
return 0, err
}
}
b := c.buf[c.off]
c.off++
return b, nil
}
// reload re-fills the scanner's buffer.
func (c *scanner) reload() error {
n, err := c.r.Read(c.buf[:cap(c.buf)])
c.buf = c.buf[:n]
if err != nil {
if err != io.EOF {
return err
}
if n == 0 {
return io.EOF
}
}
c.off = 0
return nil
}
// MJPEG parses MJPEG frames read from src into separate writes to dst with
// successive writes being performed not earlier than the specified delay.
func MJPEG(dst io.Writer, src io.Reader, delay time.Duration, bufSize int) error {
var tick <-chan time.Time
if delay == 0 {
tick = noDelay
} else {
ticker := time.NewTicker(delay)
defer ticker.Stop()
tick = ticker.C
}
r := bufio.NewReader(src)
for {
buf := make([]byte, 2, 4<<10)
n, err := r.Read(buf)
if n < 2 {
return nil
}
if err != nil {
return err
}
if !bytes.Equal(buf, []byte{0xff, 0xd8}) {
return fmt.Errorf("parser: not MJPEG frame start: %#v", buf)
}
var last byte
for {
b, err := r.ReadByte()
if err != nil {
return err
}
buf = append(buf, b)
if last == 0xff && b == 0xd9 {
break
}
last = b
}
<-tick
_, err = dst.Write(buf)
if err != nil {
return err
}
}
}
// PCM reads from the given source and breaks the PCM into chunks that
// are an appropriate size for mts and pes packets.
func PCM(dst io.Writer, src io.Reader, delay time.Duration, bufSize int) error {
var tick <-chan time.Time
if delay == 0 {
tick = noDelay
} else {
ticker := time.NewTicker(delay)
defer ticker.Stop()
tick = ticker.C
}
for {
<-tick
buf := make([]byte, bufSize)
_, err := src.Read(buf)
if err != nil {
return err
}
_, err = dst.Write(buf)
if err != nil {
return err
}
}
}
// ADPCM reads from the given source and breaks the ADPCM into chunks that
// are an appropriate size for mts and pes packets.
// Since PCM and ADPCM are not any different when it comes to how they are
// transmitted, ADPCM is just a wrapper for PCM.
func ADPCM(dst io.Writer, src io.Reader, delay time.Duration, bufSize int) error {
err := PCM(dst, src, delay, bufSize)
return err
}

89
codec/mjpeg/lex.go Normal file
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@ -0,0 +1,89 @@
/*
NAME
lex.go
DESCRIPTION
lex.go provides a lexer to extract separate JPEG images from a MJPEG stream.
AUTHOR
Dan Kortschak <dan@ausocean.org>
LICENSE
lex.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with revid in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
// lex.go provides a lexer to extract separate JPEG images from a MJPEG stream.
package mjpeg
import (
"bufio"
"bytes"
"fmt"
"io"
"time"
)
var noDelay = make(chan time.Time)
func init() {
close(noDelay)
}
// Lex parses MJPEG frames read from src into separate writes to dst with
// successive writes being performed not earlier than the specified delay.
func Lex(dst io.Writer, src io.Reader, delay time.Duration) error {
var tick <-chan time.Time
if delay == 0 {
tick = noDelay
} else {
ticker := time.NewTicker(delay)
defer ticker.Stop()
tick = ticker.C
}
r := bufio.NewReader(src)
for {
buf := make([]byte, 2, 4<<10)
n, err := r.Read(buf)
if n < 2 {
return nil
}
if err != nil {
return err
}
if !bytes.Equal(buf, []byte{0xff, 0xd8}) {
return fmt.Errorf("parser: not MJPEG frame start: %#v", buf)
}
var last byte
for {
b, err := r.ReadByte()
if err != nil {
return err
}
buf = append(buf, b)
if last == 0xff && b == 0xd9 {
break
}
last = b
}
<-tick
_, err = dst.Write(buf)
if err != nil {
return err
}
}
}

114
codec/mjpeg/lex_test.go Normal file
View File

@ -0,0 +1,114 @@
/*
NAME
lex_test.go
DESCRIPTION
lex_test.go provides testing for the lexer in lex.go.
AUTHOR
Dan Kortschak <dan@ausocean.org>
LICENSE
lex_test.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with revid in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
// lex_test.go provides testing for the lexer in lex.go.
package mjpeg
import (
"time"
)
var mjpegTests = []struct {
name string
input []byte
delay time.Duration
want [][]byte
err error
}{
{
name: "empty",
},
{
name: "null",
input: []byte{0xff, 0xd8, 0xff, 0xd9},
delay: 0,
want: [][]byte{{0xff, 0xd8, 0xff, 0xd9}},
},
{
name: "null delayed",
input: []byte{0xff, 0xd8, 0xff, 0xd9},
delay: time.Millisecond,
want: [][]byte{{0xff, 0xd8, 0xff, 0xd9}},
},
{
name: "full",
input: []byte{
0xff, 0xd8, 'f', 'u', 'l', 'l', 0xff, 0xd9,
0xff, 0xd8, 'f', 'r', 'a', 'm', 'e', 0xff, 0xd9,
0xff, 0xd8, 'w', 'i', 't', 'h', 0xff, 0xd9,
0xff, 0xd8, 'l', 'e', 'n', 'g', 't', 'h', 0xff, 0xd9,
0xff, 0xd8, 's', 'p', 'r', 'e', 'a', 'd', 0xff, 0xd9,
},
delay: 0,
want: [][]byte{
{0xff, 0xd8, 'f', 'u', 'l', 'l', 0xff, 0xd9},
{0xff, 0xd8, 'f', 'r', 'a', 'm', 'e', 0xff, 0xd9},
{0xff, 0xd8, 'w', 'i', 't', 'h', 0xff, 0xd9},
{0xff, 0xd8, 'l', 'e', 'n', 'g', 't', 'h', 0xff, 0xd9},
{0xff, 0xd8, 's', 'p', 'r', 'e', 'a', 'd', 0xff, 0xd9},
},
},
{
name: "full delayed",
input: []byte{
0xff, 0xd8, 'f', 'u', 'l', 'l', 0xff, 0xd9,
0xff, 0xd8, 'f', 'r', 'a', 'm', 'e', 0xff, 0xd9,
0xff, 0xd8, 'w', 'i', 't', 'h', 0xff, 0xd9,
0xff, 0xd8, 'l', 'e', 'n', 'g', 't', 'h', 0xff, 0xd9,
0xff, 0xd8, 's', 'p', 'r', 'e', 'a', 'd', 0xff, 0xd9,
},
delay: time.Millisecond,
want: [][]byte{
{0xff, 0xd8, 'f', 'u', 'l', 'l', 0xff, 0xd9},
{0xff, 0xd8, 'f', 'r', 'a', 'm', 'e', 0xff, 0xd9},
{0xff, 0xd8, 'w', 'i', 't', 'h', 0xff, 0xd9},
{0xff, 0xd8, 'l', 'e', 'n', 'g', 't', 'h', 0xff, 0xd9},
{0xff, 0xd8, 's', 'p', 'r', 'e', 'a', 'd', 0xff, 0xd9},
},
},
}
// FIXME this needs to be adapted
/*
func Lex(t *testing.T) {
for _, test := range mjpegTests {
var buf chunkEncoder
err := MJPEG(&buf, bytes.NewReader(test.input), test.delay)
if fmt.Sprint(err) != fmt.Sprint(test.err) {
t.Errorf("unexpected error for %q: got:%v want:%v", test.name, err, test.err)
}
if err != nil {
continue
}
got := [][]byte(buf)
if !reflect.DeepEqual(got, test.want) {
t.Errorf("unexpected result for %q:\ngot :%#v\nwant:%#v", test.name, got, test.want)
}
}
}
*/

2
codec/pcm/pcm.go
View File

@ -24,6 +24,8 @@ LICENSE
You should have received a copy of the GNU General Public License in gpl.txt. You should have received a copy of the GNU General Public License in gpl.txt.
If not, see [GNU licenses](http://www.gnu.org/licenses). If not, see [GNU licenses](http://www.gnu.org/licenses).
*/ */
// Package pcm provides functions for processing and converting pcm audio.
package pcm package pcm
import ( import (

115
container/flv/flv_test.go Normal file
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@ -0,0 +1,115 @@
/*
NAME
flv_test.go
DESCRIPTION
flv_test.go provides testing for functionality provided in flv.go.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with revid in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package flv
import (
"bytes"
"testing"
)
// TestVideoTagBytes checks that we can correctly get a []byte representation
// of a VideoTag using VideoTag.Bytes().
func TestVideoTagBytes(t *testing.T) {
tests := []struct {
tag VideoTag
expected []byte
}{
{
tag: VideoTag{
TagType: VideoTagType,
DataSize: 12,
Timestamp: 1234,
TimestampExtended: 56,
FrameType: KeyFrameType,
Codec: H264,
PacketType: AVCNALU,
CompositionTime: 0,
Data: []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07},
},
expected: []byte{
0x09, // TagType.
0x00, 0x00, 0x0c, // DataSize.
0x00, 0x04, 0xd2, // Timestamp.
0x38, // TimestampExtended.
0x00, 0x00, 0x00, // StreamID. (always 0)
0x17, // FrameType=0001, Codec=0111
0x01, // PacketType.
0x00, 0x00, 0x00, // CompositionTime
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, // VideoData.
0x00, 0x00, 0x00, 0x00, // previousTagSize.
},
},
}
for testNum, test := range tests {
got := test.tag.Bytes()
if !bytes.Equal(got, test.expected) {
t.Errorf("did not get expected result for test: %v.\n Got: %v\n Want: %v\n", testNum, got, test.expected)
}
}
}
// TestAudioTagBytes checks that we can correctly get a []byte representation of
// an AudioTag using AudioTag.Bytes().
func TestAudioTagBytes(t *testing.T) {
tests := []struct {
tag AudioTag
expected []byte
}{
{
tag: AudioTag{
TagType: AudioTagType,
DataSize: 8,
Timestamp: 1234,
TimestampExtended: 56,
SoundFormat: AACAudioFormat,
SoundRate: 3,
SoundSize: true,
SoundType: true,
Data: []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07},
},
expected: []byte{
0x08, // TagType.
0x00, 0x00, 0x08, // DataSize.
0x00, 0x04, 0xd2, // Timestamp.
0x38, // TimestampExtended.
0x00, 0x00, 0x00, // StreamID. (always 0)
0xaf, // SoundFormat=1010,SoundRate=11,SoundSize=1,SoundType=1
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, // AudioData.
0x00, 0x00, 0x00, 0x00, // previousTagSize.
},
},
}
for testNum, test := range tests {
got := test.tag.Bytes()
if !bytes.Equal(got, test.expected) {
t.Errorf("did not get expected result for test: %v.\n Got: %v\n Want: %v\n", testNum, got, test.expected)
}
}
}

144
container/mts/audio_test.go
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@ -1,144 +0,0 @@
/*
NAME
audio_test.go
AUTHOR
Trek Hopton <trek@ausocean.org>
LICENSE
audio_test.go is Copyright (C) 2017-2019 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License in gpl.txt.
If not, see http://www.gnu.org/licenses.
*/
package mts
import (
"bytes"
"io"
"io/ioutil"
"testing"
"github.com/Comcast/gots/packet"
"github.com/Comcast/gots/pes"
"bitbucket.org/ausocean/av/container/mts/meta"
)
type nopCloser struct{ io.Writer }
func (nopCloser) Close() error { return nil }
// TestEncodePcm tests the mpegts encoder's ability to encode pcm audio data.
// It reads and encodes input pcm data into mpegts, then decodes the mpegts and compares the result to the input pcm.
func TestEncodePcm(t *testing.T) {
Meta = meta.New()
var buf bytes.Buffer
sampleRate := 48000
sampleSize := 2
chunkSize := 16000
writeFreq := float64(sampleRate*sampleSize) / float64(chunkSize)
e := NewEncoder(nopCloser{&buf}, writeFreq, Audio)
inPath := "../../../test/test-data/av/input/sweep_400Hz_20000Hz_-3dBFS_5s_48khz.pcm"
inPcm, err := ioutil.ReadFile(inPath)
if err != nil {
t.Errorf("unable to read file: %v", err)
}
// Break pcm into blocks and encode to mts and get the resulting bytes.
for i := 0; i < len(inPcm); i += chunkSize {
if len(inPcm)-i < chunkSize {
block := inPcm[i:]
_, err = e.Write(block)
if err != nil {
t.Errorf("unable to write block: %v", err)
}
} else {
block := inPcm[i : i+chunkSize]
_, err = e.Write(block)
if err != nil {
t.Errorf("unable to write block: %v", err)
}
}
}
clip := buf.Bytes()
// Get the first MTS packet to check
var pkt packet.Packet
pesPacket := make([]byte, 0, chunkSize)
got := make([]byte, 0, len(inPcm))
i := 0
if i+PacketSize <= len(clip) {
copy(pkt[:], clip[i:i+PacketSize])
}
// Loop through MTS packets until all the audio data from PES packets has been retrieved
for i+PacketSize <= len(clip) {
// Check MTS packet
if !(pkt.PID() == AudioPid) {
i += PacketSize
if i+PacketSize <= len(clip) {
copy(pkt[:], clip[i:i+PacketSize])
}
continue
}
if !pkt.PayloadUnitStartIndicator() {
i += PacketSize
if i+PacketSize <= len(clip) {
copy(pkt[:], clip[i:i+PacketSize])
}
} else {
// Copy the first MTS payload
payload, err := pkt.Payload()
if err != nil {
t.Errorf("unable to get MTS payload: %v", err)
}
pesPacket = append(pesPacket, payload...)
i += PacketSize
if i+PacketSize <= len(clip) {
copy(pkt[:], clip[i:i+PacketSize])
}
// Copy the rest of the MTS payloads that are part of the same PES packet
for (!pkt.PayloadUnitStartIndicator()) && i+PacketSize <= len(clip) {
payload, err = pkt.Payload()
if err != nil {
t.Errorf("unable to get MTS payload: %v", err)
}
pesPacket = append(pesPacket, payload...)
i += PacketSize
if i+PacketSize <= len(clip) {
copy(pkt[:], clip[i:i+PacketSize])
}
}
}
// Get the audio data from the current PES packet
pesHeader, err := pes.NewPESHeader(pesPacket)
if err != nil {
t.Errorf("unable to read PES packet: %v", err)
}
got = append(got, pesHeader.Data()...)
pesPacket = pesPacket[:0]
}
// Compare data from MTS with original data.
if !bytes.Equal(got, inPcm) {
t.Error("data decoded from mts did not match input data")
}
}

8
container/mts/discontinuity.go
View File

@ -4,8 +4,8 @@ NAME
DESCRIPTION DESCRIPTION
discontinuity.go provides functionality for detecting discontinuities in discontinuity.go provides functionality for detecting discontinuities in
mpegts and accounting for using the discontinuity indicator in the adaptation MPEG-TS and accounting for using the discontinuity indicator in the adaptation
field. field.
AUTHOR AUTHOR
Saxon A. Nelson-Milton <saxon@ausocean.org> Saxon A. Nelson-Milton <saxon@ausocean.org>
@ -33,7 +33,7 @@ import (
"github.com/Comcast/gots/packet" "github.com/Comcast/gots/packet"
) )
// discontinuityRepairer provides function to detect discontinuities in mpegts // discontinuityRepairer provides function to detect discontinuities in MPEG-TS
// and set the discontinuity indicator as appropriate. // and set the discontinuity indicator as appropriate.
type DiscontinuityRepairer struct { type DiscontinuityRepairer struct {
expCC map[int]int expCC map[int]int
@ -56,7 +56,7 @@ func (dr *DiscontinuityRepairer) Failed() {
dr.decExpectedCC(PatPid) dr.decExpectedCC(PatPid)
} }
// Repair takes a clip of mpegts and checks that the first packet, which should // Repair takes a clip of MPEG-TS and checks that the first packet, which should
// be a PAT, contains a cc that is expected, otherwise the discontinuity indicator // be a PAT, contains a cc that is expected, otherwise the discontinuity indicator
// is set to true. // is set to true.
func (dr *DiscontinuityRepairer) Repair(d []byte) error { func (dr *DiscontinuityRepairer) Repair(d []byte) error {

106
container/mts/encoder.go
View File

@ -55,30 +55,6 @@ var (
}, },
}, },
} }
// standardPmt is a minimal PMT, without descriptors for time and location.
standardPmt = psi.PSI{
Pf: 0x00,
Tid: 0x02,
Ssi: true,
Sl: 0x12,
Tss: &psi.TSS{
Tide: 0x01,
V: 0,
Cni: true,
Sn: 0,
Lsn: 0,
Sd: &psi.PMT{
Pcrpid: 0x0100,
Pil: 0,
Essd: &psi.ESSD{
St: 0x1b,
Epid: 0x0100,
Esil: 0x00,
},
},
},
}
) )
const ( const (
@ -94,38 +70,41 @@ var Meta *meta.Data
var ( var (
patTable = standardPat.Bytes() patTable = standardPat.Bytes()
pmtTable = standardPmt.Bytes() pmtTable []byte
) )
const ( const (
sdtPid = 17 sdtPid = 17
patPid = 0 patPid = 0
pmtPid = 4096 pmtPid = 4096
videoPid = 256 videoPid = 256
// AudioPid is the Id for packets containing audio data audioPid = 210
AudioPid = 210 H264ID = 27
videoStreamID = 0xe0 // First video stream ID. H265ID = 36
audioStreamID = 0xc0 // First audio stream ID. audioStreamID = 0xc0 // First audio stream ID.
) )
// Video and Audio constants are used to communicate which media type will be encoded when creating a // Constants used to communicate which media codec will be packetized.
// new encoder with NewEncoder.
const ( const (
Video = iota EncodeH264 = iota
Audio EncodeH265
EncodeAudio
) )
// Time related constants. // Time-related constants.
const ( const (
// ptsOffset is the offset added to the clock to determine // ptsOffset is the offset added to the clock to determine
// the current presentation timestamp. // the current presentation timestamp.
ptsOffset = 700 * time.Millisecond ptsOffset = 700 * time.Millisecond
// pcrFreq is the base Program Clock Reference frequency. // PCRFrequency is the base Program Clock Reference frequency in Hz.
pcrFreq = 90000 // Hz PCRFrequency = 90000
// PTSFrequency is the presentation timestamp frequency in Hz.
PTSFrequency = 90000
) )
// Encoder encapsulates properties of an mpegts generator. // Encoder encapsulates properties of an MPEG-TS generator.
type Encoder struct { type Encoder struct {
dst io.WriteCloser dst io.WriteCloser
@ -153,14 +132,41 @@ func NewEncoder(dst io.WriteCloser, rate float64, mediaType int) *Encoder {
var mPid int var mPid int
var sid byte var sid byte
switch mediaType { switch mediaType {
case Audio: case EncodeAudio:
mPid = AudioPid mPid = audioPid
sid = audioStreamID sid = audioStreamID
case Video: case EncodeH265:
mPid = videoPid mPid = videoPid
sid = videoStreamID sid = H265ID
case EncodeH264:
mPid = videoPid
sid = H264ID
} }
// standardPmt is a minimal PMT, without descriptors for metadata.
pmtTable = (&psi.PSI{
Pf: 0x00,
Tid: 0x02,
Ssi: true,
Sl: 0x12,
Tss: &psi.TSS{
Tide: 0x01,
V: 0,
Cni: true,
Sn: 0,
Lsn: 0,
Sd: &psi.PMT{
Pcrpid: 0x0100,
Pil: 0,
Essd: &psi.ESSD{
St: byte(sid),
Epid: 0x0100,
Esil: 0x00,
},
},
},
}).Bytes()
return &Encoder{ return &Encoder{
dst: dst, dst: dst,
@ -202,7 +208,7 @@ func (e *Encoder) TimeBasedPsi(b bool, sendCount int) {
e.pktCount = e.psiSendCount e.pktCount = e.psiSendCount
} }
// Write implements io.Writer. Write takes raw video or audio data and encodes into mpegts, // Write implements io.Writer. Write takes raw video or audio data and encodes into MPEG-TS,
// then sending it to the encoder's io.Writer destination. // then sending it to the encoder's io.Writer destination.
func (e *Encoder) Write(data []byte) (int, error) { func (e *Encoder) Write(data []byte) (int, error) {
now := time.Now() now := time.Now()
@ -257,7 +263,7 @@ func (e *Encoder) Write(data []byte) (int, error) {
return len(data), nil return len(data), nil
} }
// writePSI creates mpegts with pat and pmt tables - with pmt table having updated // writePSI creates MPEG-TS with pat and pmt tables - with pmt table having updated
// location and time data. // location and time data.
func (e *Encoder) writePSI() error { func (e *Encoder) writePSI() error {
// Write PAT. // Write PAT.
@ -265,7 +271,7 @@ func (e *Encoder) writePSI() error {
PUSI: true, PUSI: true,
PID: PatPid, PID: PatPid,
CC: e.ccFor(PatPid), CC: e.ccFor(PatPid),
AFC: HasPayload, AFC: hasPayload,
Payload: psi.AddPadding(patTable), Payload: psi.AddPadding(patTable),
} }
_, err := e.dst.Write(patPkt.Bytes(e.tsSpace[:PacketSize])) _, err := e.dst.Write(patPkt.Bytes(e.tsSpace[:PacketSize]))
@ -283,7 +289,7 @@ func (e *Encoder) writePSI() error {
PUSI: true, PUSI: true,
PID: PmtPid, PID: PmtPid,
CC: e.ccFor(PmtPid), CC: e.ccFor(PmtPid),
AFC: HasPayload, AFC: hasPayload,
Payload: psi.AddPadding(pmtTable), Payload: psi.AddPadding(pmtTable),
} }
_, err = e.dst.Write(pmtPkt.Bytes(e.tsSpace[:PacketSize])) _, err = e.dst.Write(pmtPkt.Bytes(e.tsSpace[:PacketSize]))
@ -301,12 +307,12 @@ func (e *Encoder) tick() {
// pts retuns the current presentation timestamp. // pts retuns the current presentation timestamp.
func (e *Encoder) pts() uint64 { func (e *Encoder) pts() uint64 {
return uint64((e.clock + e.ptsOffset).Seconds() * pcrFreq) return uint64((e.clock + e.ptsOffset).Seconds() * PTSFrequency)
} }
// pcr returns the current program clock reference. // pcr returns the current program clock reference.
func (e *Encoder) pcr() uint64 { func (e *Encoder) pcr() uint64 {
return uint64(e.clock.Seconds() * pcrFreq) return uint64(e.clock.Seconds() * PCRFrequency)
} }
// ccFor returns the next continuity counter for pid. // ccFor returns the next continuity counter for pid.

252
container/mts/encoder_test.go Normal file
View File

@ -0,0 +1,252 @@
/*
NAME
encoder_test.go
AUTHOR
Trek Hopton <trek@ausocean.org>
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
encoder_test.go is Copyright (C) 2017-2019 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License in gpl.txt.
If not, see http://www.gnu.org/licenses.
*/
package mts
import (
"bytes"
"io"
"io/ioutil"
"testing"
"github.com/Comcast/gots/packet"
"github.com/Comcast/gots/pes"
"bitbucket.org/ausocean/av/container/mts/meta"
)
type nopCloser struct{ io.Writer }
func (nopCloser) Close() error { return nil }
type destination struct {
packets [][]byte
}
func (d *destination) Write(p []byte) (int, error) {
tmp := make([]byte, PacketSize)
copy(tmp, p)
d.packets = append(d.packets, tmp)
return len(p), nil
}
// TestEncodeVideo checks that we can correctly encode some dummy data into a
// valid MPEG-TS stream. This checks for correct MPEG-TS headers and also that the
// original data is stored correctly and is retreivable.
func TestEncodeVideo(t *testing.T) {
Meta = meta.New()
const dataLength = 440
const numOfPackets = 3
const stuffingLen = 100
// Generate test data.
data := make([]byte, 0, dataLength)
for i := 0; i < dataLength; i++ {
data = append(data, byte(i))
}
// Expect headers for PID 256 (video)
// NB: timing fields like PCR are neglected.
expectedHeaders := [][]byte{
{
0x47, // Sync byte.
0x41, // TEI=0, PUSI=1, TP=0, PID=00001 (256).
0x00, // PID(Cont)=00000000.
0x30, // TSC=00, AFC=11(adaptation followed by payload), CC=0000(0).
0x07, // AFL= 7.
0x50, // DI=0,RAI=1,ESPI=0,PCRF=1,OPCRF=0,SPF=0,TPDF=0, AFEF=0.
},
{
0x47, // Sync byte.
0x01, // TEI=0, PUSI=0, TP=0, PID=00001 (256).
0x00, // PID(Cont)=00000000.
0x31, // TSC=00, AFC=11(adaptation followed by payload), CC=0001(1).
0x01, // AFL= 1.
0x00, // DI=0,RAI=0,ESPI=0,PCRF=0,OPCRF=0,SPF=0,TPDF=0, AFEF=0.
},
{
0x47, // Sync byte.
0x01, // TEI=0, PUSI=0, TP=0, PID=00001 (256).
0x00, // PID(Cont)=00000000.
0x32, // TSC=00, AFC=11(adaptation followed by payload), CC=0010(2).
0x57, // AFL= 1+stuffingLen.
0x00, // DI=0,RAI=0,ESPI=0,PCRF=1,OPCRF=0,SPF=0,TPDF=0, AFEF=0.
},
}
// Create the dst and write the test data to encoder.
dst := &destination{}
_, err := NewEncoder(nopCloser{dst}, 25, EncodeH264).Write(data)
if err != nil {
t.Fatalf("could not write data to encoder, failed with err: %v\n", err)
}
// Check headers.
var expectedIdx int
for _, p := range dst.packets {
// Get PID.
var _p packet.Packet
copy(_p[:], p)
pid := packet.Pid(&_p)
if pid == VideoPid {
// Get mts header, excluding PCR.
gotHeader := p[0:6]
wantHeader := expectedHeaders[expectedIdx]
if !bytes.Equal(gotHeader, wantHeader) {
t.Errorf("did not get expected header for idx: %v.\n Got: %v\n Want: %v\n", expectedIdx, gotHeader, wantHeader)
}
expectedIdx++
}
}
// Gather payload data from packets to form the total PES packet.
var pesData []byte
for _, p := range dst.packets {
var _p packet.Packet
copy(_p[:], p)
pid := packet.Pid(&_p)
if pid == VideoPid {
payload, err := packet.Payload(&_p)
if err != nil {
t.Fatalf("could not get payload from mts packet, failed with err: %v\n", err)
}
pesData = append(pesData, payload...)
}
}
// Get data from the PES packet and compare with the original data.
pes, err := pes.NewPESHeader(pesData)
if err != nil {
t.Fatalf("got error from pes creation: %v\n", err)
}
_data := pes.Data()
if !bytes.Equal(data, _data) {
t.Errorf("did not get expected result.\n Got: %v\n Want: %v\n", data, _data)
}
}
// TestEncodePcm tests the MPEG-TS encoder's ability to encode pcm audio data.
// It reads and encodes input pcm data into MPEG-TS, then decodes the MPEG-TS and compares the result to the input pcm.
func TestEncodePcm(t *testing.T) {
Meta = meta.New()
var buf bytes.Buffer
sampleRate := 48000
sampleSize := 2
blockSize := 16000
writeFreq := float64(sampleRate*sampleSize) / float64(blockSize)
e := NewEncoder(nopCloser{&buf}, writeFreq, EncodeAudio)
inPath := "../../../test/test-data/av/input/sweep_400Hz_20000Hz_-3dBFS_5s_48khz.pcm"
inPcm, err := ioutil.ReadFile(inPath)
if err != nil {
t.Errorf("unable to read file: %v", err)
}
// Break pcm into blocks and encode to mts and get the resulting bytes.
for i := 0; i < len(inPcm); i += blockSize {
if len(inPcm)-i < blockSize {
block := inPcm[i:]
_, err = e.Write(block)
if err != nil {
t.Errorf("unable to write block: %v", err)
}
} else {
block := inPcm[i : i+blockSize]
_, err = e.Write(block)
if err != nil {
t.Errorf("unable to write block: %v", err)
}
}
}
clip := buf.Bytes()
// Get the first MTS packet to check
var pkt packet.Packet
pesPacket := make([]byte, 0, blockSize)
got := make([]byte, 0, len(inPcm))
i := 0
if i+PacketSize <= len(clip) {
copy(pkt[:], clip[i:i+PacketSize])
}
// Loop through MTS packets until all the audio data from PES packets has been retrieved
for i+PacketSize <= len(clip) {
// Check MTS packet
if !(pkt.PID() == audioPid) {
i += PacketSize
if i+PacketSize <= len(clip) {
copy(pkt[:], clip[i:i+PacketSize])
}
continue
}
if !pkt.PayloadUnitStartIndicator() {
i += PacketSize
if i+PacketSize <= len(clip) {
copy(pkt[:], clip[i:i+PacketSize])
}
} else {
// Copy the first MTS payload
payload, err := pkt.Payload()
if err != nil {
t.Errorf("unable to get MTS payload: %v", err)
}
pesPacket = append(pesPacket, payload...)
i += PacketSize
if i+PacketSize <= len(clip) {
copy(pkt[:], clip[i:i+PacketSize])
}
// Copy the rest of the MTS payloads that are part of the same PES packet
for (!pkt.PayloadUnitStartIndicator()) && i+PacketSize <= len(clip) {
payload, err = pkt.Payload()
if err != nil {
t.Errorf("unable to get MTS payload: %v", err)
}
pesPacket = append(pesPacket, payload...)
i += PacketSize
if i+PacketSize <= len(clip) {
copy(pkt[:], clip[i:i+PacketSize])
}
}
}
// Get the audio data from the current PES packet
pesHeader, err := pes.NewPESHeader(pesPacket)
if err != nil {
t.Errorf("unable to read PES packet: %v", err)
}
got = append(got, pesHeader.Data()...)
pesPacket = pesPacket[:0]
}
// Compare data from MTS with original data.
if !bytes.Equal(got, inPcm) {
t.Error("data decoded from mts did not match input data")
}
}

4
container/mts/metaEncode_test.go
View File

@ -48,7 +48,7 @@ const fps = 25
func TestMetaEncode1(t *testing.T) { func TestMetaEncode1(t *testing.T) {
Meta = meta.New() Meta = meta.New()
var buf bytes.Buffer var buf bytes.Buffer
e := NewEncoder(nopCloser{&buf}, fps, Video) e := NewEncoder(nopCloser{&buf}, fps, EncodeH264)
Meta.Add("ts", "12345678") Meta.Add("ts", "12345678")
if err := e.writePSI(); err != nil { if err := e.writePSI(); err != nil {
t.Errorf(errUnexpectedErr, err.Error()) t.Errorf(errUnexpectedErr, err.Error())
@ -76,7 +76,7 @@ func TestMetaEncode1(t *testing.T) {
func TestMetaEncode2(t *testing.T) { func TestMetaEncode2(t *testing.T) {
Meta = meta.New() Meta = meta.New()
var buf bytes.Buffer var buf bytes.Buffer
e := NewEncoder(nopCloser{&buf}, fps, Video) e := NewEncoder(nopCloser{&buf}, fps, EncodeH264)
Meta.Add("ts", "12345678") Meta.Add("ts", "12345678")
Meta.Add("loc", "1234,4321,1234") Meta.Add("loc", "1234,4321,1234")
if err := e.writePSI(); err != nil { if err := e.writePSI(); err != nil {

176
container/mts/mpegts.go
View File

@ -1,7 +1,7 @@
/* /*
NAME NAME
mpegts.go - provides a data structure intended to encapsulate the properties mpegts.go - provides a data structure intended to encapsulate the properties
of an MpegTs packet and also functions to allow manipulation of these packets. of an MPEG-TS packet and also functions to allow manipulation of these packets.
DESCRIPTION DESCRIPTION
See Readme.md See Readme.md
@ -26,6 +26,7 @@ LICENSE
along with revid in gpl.txt. If not, see [GNU licenses](http://www.gnu.org/licenses). along with revid in gpl.txt. If not, see [GNU licenses](http://www.gnu.org/licenses).
*/ */
// Package mts provides MPEGT-TS (mts) encoding and related functions.
package mts package mts
import ( import (
@ -33,13 +34,10 @@ import (
"fmt" "fmt"
"github.com/Comcast/gots/packet" "github.com/Comcast/gots/packet"
"github.com/Comcast/gots/pes"
) )
// General mpegts packet properties. const PacketSize = 188
const (
PacketSize = 188
PayloadSize = 176
)
// Program ID for various types of ts packets. // Program ID for various types of ts packets.
const ( const (
@ -52,7 +50,7 @@ const (
// StreamID is the id of the first stream. // StreamID is the id of the first stream.
const StreamID = 0xe0 const StreamID = 0xe0
// HeadSize is the size of an mpegts packet header. // HeadSize is the size of an MPEG-TS packet header.
const HeadSize = 4 const HeadSize = 4
// Consts relating to adaptation field. // Consts relating to adaptation field.
@ -163,28 +161,28 @@ type Packet struct {
Payload []byte // Mpeg ts Payload Payload []byte // Mpeg ts Payload
} }
// FindPmt will take a clip of mpegts and try to find a PMT table - if one // FindPmt will take a clip of MPEG-TS and try to find a PMT table - if one
// is found, then it is returned along with its index, otherwise nil, -1 and an error is returned. // is found, then it is returned along with its index, otherwise nil, -1 and an error is returned.
func FindPmt(d []byte) ([]byte, int, error) { func FindPmt(d []byte) ([]byte, int, error) {
return FindPid(d, PmtPid) return FindPid(d, PmtPid)
} }
// FindPat will take a clip of mpegts and try to find a PAT table - if one // FindPat will take a clip of MPEG-TS and try to find a PAT table - if one
// is found, then it is returned along with its index, otherwise nil, -1 and an error is returned. // is found, then it is returned along with its index, otherwise nil, -1 and an error is returned.
func FindPat(d []byte) ([]byte, int, error) { func FindPat(d []byte) ([]byte, int, error) {
return FindPid(d, PatPid) return FindPid(d, PatPid)
} }
// FindPid will take a clip of mpegts and try to find a packet with given PID - if one // FindPid will take a clip of MPEG-TS and try to find a packet with given PID - if one
// is found, then it is returned along with its index, otherwise nil, -1 and an error is returned. // is found, then it is returned along with its index, otherwise nil, -1 and an error is returned.
func FindPid(d []byte, pid uint16) (pkt []byte, i int, err error) { func FindPid(d []byte, pid uint16) (pkt []byte, i int, err error) {
if len(d) < PacketSize { if len(d) < PacketSize {
return nil, -1, errors.New("Mmpegts data not of valid length") return nil, -1, errors.New("MPEG-TS data not of valid length")
} }
for i = 0; i < len(d); i += PacketSize { for i = 0; i < len(d); i += PacketSize {
p := (uint16(d[i+1]&0x1f) << 8) | uint16(d[i+2]) p := (uint16(d[i+1]&0x1f) << 8) | uint16(d[i+2])
if p == pid { if p == pid {
pkt = d[i+4 : i+PacketSize] pkt = d[i : i+PacketSize]
return return
} }
} }
@ -194,16 +192,69 @@ func FindPid(d []byte, pid uint16) (pkt []byte, i int, err error) {
// FillPayload takes a channel and fills the packets Payload field until the // FillPayload takes a channel and fills the packets Payload field until the
// channel is empty or we've the packet reaches capacity // channel is empty or we've the packet reaches capacity
func (p *Packet) FillPayload(data []byte) int { func (p *Packet) FillPayload(data []byte) int {
currentPktLen := 6 + asInt(p.PCRF)*6 + asInt(p.OPCRF)*6 + currentPktLen := 6 + asInt(p.PCRF)*6
asInt(p.SPF)*1 + asInt(p.TPDF)*1 + len(p.TPD) if len(data) > PacketSize-currentPktLen {
if len(data) > PayloadSize-currentPktLen { p.Payload = make([]byte, PacketSize-currentPktLen)
p.Payload = make([]byte, PayloadSize-currentPktLen)
} else { } else {
p.Payload = make([]byte, len(data)) p.Payload = make([]byte, len(data))
} }
return copy(p.Payload, data) return copy(p.Payload, data)
} }
// Bytes interprets the fields of the ts packet instance and outputs a
// corresponding byte slice
func (p *Packet) Bytes(buf []byte) []byte {
if buf == nil || cap(buf) < PacketSize {
buf = make([]byte, PacketSize)
}
if p.OPCRF {
panic("original program clock reference field unsupported")
}
if p.SPF {
panic("splicing countdown unsupported")
}
if p.TPDF {
panic("transport private data unsupported")
}
if p.AFEF {
panic("adaptation field extension unsupported")
}
buf = buf[:6]
buf[0] = 0x47
buf[1] = (asByte(p.TEI)<<7 | asByte(p.PUSI)<<6 | asByte(p.Priority)<<5 | byte((p.PID&0xFF00)>>8))
buf[2] = byte(p.PID & 0x00FF)
buf[3] = (p.TSC<<6 | p.AFC<<4 | p.CC)
var maxPayloadSize int
if p.AFC&0x2 != 0 {
maxPayloadSize = PacketSize - 6 - asInt(p.PCRF)*6
} else {
maxPayloadSize = PacketSize - 4
}
stuffingLen := maxPayloadSize - len(p.Payload)
if p.AFC&0x2 != 0 {
buf[4] = byte(1 + stuffingLen + asInt(p.PCRF)*6)
buf[5] = (asByte(p.DI)<<7 | asByte(p.RAI)<<6 | asByte(p.ESPI)<<5 | asByte(p.PCRF)<<4 | asByte(p.OPCRF)<<3 | asByte(p.SPF)<<2 | asByte(p.TPDF)<<1 | asByte(p.AFEF))
} else {
buf = buf[:4]
}
for i := 40; p.PCRF && i >= 0; i -= 8 {
buf = append(buf, byte((p.PCR<<15)>>uint(i)))
}
for i := 0; i < stuffingLen; i++ {
buf = append(buf, 0xff)
}
curLen := len(buf)
buf = buf[:PacketSize]
copy(buf[curLen:], p.Payload)
return buf
}
func asInt(b bool) int { func asInt(b bool) int {
if b { if b {
return 1 return 1
@ -218,55 +269,6 @@ func asByte(b bool) byte {
return 0 return 0
} }
// Bytes interprets the fields of the ts packet instance and outputs a
// corresponding byte slice
func (p *Packet) Bytes(buf []byte) []byte {
if buf == nil || cap(buf) != PacketSize {
buf = make([]byte, 0, PacketSize)
}
buf = buf[:0]
stuffingLength := 182 - len(p.Payload) - len(p.TPD) - asInt(p.PCRF)*6 -
asInt(p.OPCRF)*6 - asInt(p.SPF)
var stuffing []byte
if stuffingLength > 0 {
stuffing = make([]byte, stuffingLength)
}
for i := range stuffing {
stuffing[i] = 0xFF
}
afl := 1 + asInt(p.PCRF)*6 + asInt(p.OPCRF)*6 + asInt(p.SPF) + asInt(p.TPDF) + len(p.TPD) + len(stuffing)
buf = append(buf, []byte{
0x47,
(asByte(p.TEI)<<7 | asByte(p.PUSI)<<6 | asByte(p.Priority)<<5 | byte((p.PID&0xFF00)>>8)),
byte(p.PID & 0x00FF),
(p.TSC<<6 | p.AFC<<4 | p.CC),
}...)
if p.AFC == 3 || p.AFC == 2 {
buf = append(buf, []byte{
byte(afl), (asByte(p.DI)<<7 | asByte(p.RAI)<<6 | asByte(p.ESPI)<<5 |
asByte(p.PCRF)<<4 | asByte(p.OPCRF)<<3 | asByte(p.SPF)<<2 |
asByte(p.TPDF)<<1 | asByte(p.AFEF)),
}...)
for i := 40; p.PCRF && i >= 0; i -= 8 {
buf = append(buf, byte((p.PCR<<15)>>uint(i)))
}
for i := 40; p.OPCRF && i >= 0; i -= 8 {
buf = append(buf, byte(p.OPCR>>uint(i)))
}
if p.SPF {
buf = append(buf, p.SC)
}
if p.TPDF {
buf = append(buf, append([]byte{p.TPDL}, p.TPD...)...)
}
buf = append(buf, p.Ext...)
buf = append(buf, stuffing...)
}
buf = append(buf, p.Payload...)
return buf
}
type Option func(p *packet.Packet) type Option func(p *packet.Packet)
// addAdaptationField adds an adaptation field to p, and applys the passed options to this field. // addAdaptationField adds an adaptation field to p, and applys the passed options to this field.
@ -315,3 +317,47 @@ func DiscontinuityIndicator(f bool) Option {
p[DiscontinuityIndicatorIdx] |= DiscontinuityIndicatorMask & set p[DiscontinuityIndicatorIdx] |= DiscontinuityIndicatorMask & set
} }
} }
// GetPTSRange retreives the first and last PTS of an MPEGTS clip.
func GetPTSRange(clip []byte, pid uint16) (pts [2]uint64, err error) {
// Find the first packet with PID pidType.
pkt, _, err := FindPid(clip, pid)
if err != nil {
return [2]uint64{}, err
}
// Get the payload of the packet, which will be the start of the PES packet.
var _pkt packet.Packet
copy(_pkt[:], pkt)
payload, err := packet.Payload(&_pkt)
if err != nil {
fmt.Printf("_pkt: %v\n", _pkt)
return [2]uint64{}, err
}
// Get the the first PTS from the PES header.
_pes, err := pes.NewPESHeader(payload)
if err != nil {
return [2]uint64{}, err
}
pts[0] = _pes.PTS()
// Get the final PTS searching from end of clip for access unit start.
for i := len(clip) - PacketSize; i >= 0; i -= PacketSize {
copy(_pkt[:], clip[i:i+PacketSize])
if packet.PayloadUnitStartIndicator(&_pkt) && uint16(_pkt.PID()) == pid {
payload, err = packet.Payload(&_pkt)
if err != nil {
return [2]uint64{}, err
}
_pes, err = pes.NewPESHeader(payload)
if err != nil {
return [2]uint64{}, err
}
pts[1] = _pes.PTS()
return
}
}
return [2]uint64{}, errors.New("could only find one access unit in mpegts clip")
}

266
container/mts/mpegts_test.go Normal file
View File

@ -0,0 +1,266 @@
/*
NAME
mpegts_test.go
DESCRIPTION
mpegts_test.go contains testing for functionality found in mpegts.go.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package mts
import (
"bytes"
"math/rand"
"testing"
"time"
"bitbucket.org/ausocean/av/container/mts/pes"
"bitbucket.org/ausocean/av/container/mts/psi"
"github.com/Comcast/gots/packet"
)
// TestGetPTSRange checks that GetPTSRange can correctly get the first and last
// PTS in an MPEGTS clip.
func TestGetPTSRange(t *testing.T) {
const (
numOfFrames = 20
maxFrameSize = 1000
minFrameSize = 100
rate = 25 // fps
interval = float64(1) / rate // s
ptsFreq = 90000 // Hz
)
// Generate randomly sized data for each frame.
rand.Seed(time.Now().UnixNano())
frames := make([][]byte, numOfFrames)
for i := range frames {
size := rand.Intn(maxFrameSize-minFrameSize) + minFrameSize
frames[i] = make([]byte, size)
}
var clip bytes.Buffer
// Write the PSI first.
err := writePSI(&clip)
if err != nil {
t.Fatalf("did not expect error writing psi: %v", err)
}
// Now write frames.
var curTime float64
for _, frame := range frames {
nextPTS := curTime * ptsFreq
err = writeFrame(&clip, frame, uint64(nextPTS))
if err != nil {
t.Fatalf("did not expect error writing frame: %v", err)
}
curTime += interval
}
got, err := GetPTSRange(clip.Bytes(), videoPid)
if err != nil {
t.Fatalf("did not expect error getting PTS range: %v", err)
}
want := [2]uint64{0, uint64((numOfFrames - 1) * interval * ptsFreq)}
if got != want {
t.Errorf("did not get expected result.\n Got: %v\n Want: %v\n", got, want)
}
}
// writePSI is a helper function write the PSI found at the start of a clip.
func writePSI(b *bytes.Buffer) error {
// Write PAT.
pat := Packet{
PUSI: true,
PID: PatPid,
CC: 0,
AFC: HasPayload,
Payload: psi.AddPadding(patTable),
}
_, err := b.Write(pat.Bytes(nil))
if err != nil {
return err
}
// Write PMT.
pmt := Packet{
PUSI: true,
PID: PmtPid,
CC: 0,
AFC: HasPayload,
Payload: psi.AddPadding(pmtTable),
}
_, err = b.Write(pmt.Bytes(nil))
if err != nil {
return err
}
return nil
}
// writeFrame is a helper function used to form a PES packet from a frame, and
// then fragment this across MPEGTS packets where they are then written to the
// given buffer.
func writeFrame(b *bytes.Buffer, frame []byte, pts uint64) error {
// Prepare PES data.
pesPkt := pes.Packet{
StreamID: H264ID,
PDI: hasPTS,
PTS: pts,
Data: frame,
HeaderLength: 5,
}
buf := pesPkt.Bytes(nil)
// Write PES data acroos MPEGTS packets.
pusi := true
for len(buf) != 0 {
pkt := Packet{
PUSI: pusi,
PID: videoPid,
RAI: pusi,
CC: 0,
AFC: hasAdaptationField | hasPayload,
PCRF: pusi,
}
n := pkt.FillPayload(buf)
buf = buf[n:]
pusi = false
_, err := b.Write(pkt.Bytes(nil))
if err != nil {
return err
}
}
return nil
}
// TestBytes checks that Packet.Bytes() correctly produces a []byte
// representation of a Packet.
func TestBytes(t *testing.T) {
const payloadLen, payloadChar, stuffingChar = 120, 0x11, 0xff
const stuffingLen = PacketSize - payloadLen - 12
tests := []struct {
packet Packet
expectedHeader []byte
}{
{
packet: Packet{
PUSI: true,
PID: 1,
RAI: true,
CC: 4,
AFC: HasPayload | HasAdaptationField,
PCRF: true,
PCR: 1,
},
expectedHeader: []byte{
0x47, // Sync byte.
0x40, // TEI=0, PUSI=1, TP=0, PID=00000.
0x01, // PID(Cont)=00000001.
0x34, // TSC=00, AFC=11(adaptation followed by payload), CC=0100(4).
byte(7 + stuffingLen), // AFL=.
0x50, // DI=0,RAI=1,ESPI=0,PCRF=1,OPCRF=0,SPF=0,TPDF=0, AFEF=0.
0x00, 0x00, 0x00, 0x00, 0x80, 0x00, // PCR.
},
},
}
for testNum, test := range tests {
// Construct payload.
payload := make([]byte, 0, payloadLen)
for i := 0; i < payloadLen; i++ {
payload = append(payload, payloadChar)
}
// Fill the packet payload.
test.packet.FillPayload(payload)
// Create expected packet data and copy in expected header.
expected := make([]byte, len(test.expectedHeader), PacketSize)
copy(expected, test.expectedHeader)
// Append stuffing.
for i := 0; i < stuffingLen; i++ {
expected = append(expected, stuffingChar)
}
// Append payload to expected bytes.
expected = append(expected, payload...)
// Compare got with expected.
got := test.packet.Bytes(nil)
if !bytes.Equal(got, expected) {
t.Errorf("did not get expected result for test: %v.\n Got: %v\n Want: %v\n", testNum, got, expected)
}
}
}
// TestFindPid checks that FindPid can correctly extract the first instance
// of a PID from an MPEG-TS stream.
func TestFindPid(t *testing.T) {
const targetPacketNum, numOfPackets, targetPid, stdPid = 6, 15, 1, 0
// Prepare the stream of packets.
var stream []byte
for i := 0; i < numOfPackets; i++ {
pid := uint16(stdPid)
if i == targetPacketNum {
pid = targetPid
}
p := Packet{
PID: pid,
AFC: hasPayload | hasAdaptationField,
}
p.FillPayload([]byte{byte(i)})
stream = append(stream, p.Bytes(nil)...)
}
// Try to find the targetPid in the stream.
p, i, err := FindPid(stream, targetPid)
if err != nil {
t.Fatalf("unexpected error finding PID: %v\n", err)
}
// Check the payload.
var _p packet.Packet
copy(_p[:], p)
payload, err := packet.Payload(&_p)
if err != nil {
t.Fatalf("unexpected error getting packet payload: %v\n", err)
}
got := payload[0]
if got != targetPacketNum {
t.Errorf("payload of found packet is not correct.\nGot: %v, Want: %v\n", got, targetPacketNum)
}
// Check the index.
_got := i / PacketSize
if _got != targetPacketNum {
t.Errorf("index of found packet is not correct.\nGot: %v, want: %v\n", _got, targetPacketNum)
}
}

19
container/mts/pes/pes.go
View File

@ -26,7 +26,13 @@ LICENSE
package pes package pes
<<<<<<< HEAD
const MaxPesSize = 64 * 1 << 10 // 65536 const MaxPesSize = 64 * 1 << 10 // 65536
=======
import "github.com/Comcast/gots"
const MaxPesSize = 64 * 1 << 10
>>>>>>> master
/* /*
The below data struct encapsulates the fields of an PES packet. Below is The below data struct encapsulates the fields of an PES packet. Below is
@ -108,16 +114,11 @@ func (p *Packet) Bytes(buf []byte) []byte {
boolByte(p.ACIF)<<2 | boolByte(p.CRCF)<<1 | boolByte(p.EF)), boolByte(p.ACIF)<<2 | boolByte(p.CRCF)<<1 | boolByte(p.EF)),
p.HeaderLength, p.HeaderLength,
}...) }...)
if p.PDI == byte(2) { if p.PDI == byte(2) {
pts := 0x2100010001 | (p.PTS&0x1C0000000)<<3 | (p.PTS&0x3FFF8000)<<2 | ptsIdx := len(buf)
(p.PTS&0x7FFF)<<1 buf = buf[:ptsIdx+5]
buf = append(buf, []byte{ gots.InsertPTS(buf[ptsIdx:], p.PTS)
byte((pts & 0xFF00000000) >> 32),
byte((pts & 0x00FF000000) >> 24),
byte((pts & 0x0000FF0000) >> 16),
byte((pts & 0x000000FF00) >> 8),
byte(pts & 0x00000000FF),
}...)
} }
buf = append(buf, append(p.Stuff, p.Data...)...) buf = append(buf, append(p.Stuff, p.Data...)...)
return buf return buf

2
container/mts/psi/helpers.go
View File

@ -125,7 +125,7 @@ func trimTo(d []byte, t byte) []byte {
} }
// addPadding adds an appropriate amount of padding to a pat or pmt table for // addPadding adds an appropriate amount of padding to a pat or pmt table for
// addition to an mpegts packet // addition to an MPEG-TS packet
func AddPadding(d []byte) []byte { func AddPadding(d []byte) []byte {
t := make([]byte, PacketSize) t := make([]byte, PacketSize)
copy(t, d) copy(t, d)

2
container/mts/psi/psi.go
View File

@ -32,7 +32,7 @@ import (
"github.com/Comcast/gots/psi" "github.com/Comcast/gots/psi"
) )
// PacketSize of psi (without mpegts header) // PacketSize of psi (without MPEG-TS header)
const PacketSize = 184 const PacketSize = 184
// Lengths of section definitions. // Lengths of section definitions.

7
exp/adpcm/decode-pcm/decode-pcm.go
View File

@ -2,9 +2,6 @@
NAME NAME
decode-pcm.go decode-pcm.go
DESCRIPTION
decode-pcm.go is a program for decoding/decompressing an adpcm file to a pcm file.
AUTHOR AUTHOR
Trek Hopton <trek@ausocean.org> Trek Hopton <trek@ausocean.org>
@ -25,6 +22,7 @@ LICENSE
If not, see [GNU licenses](http://www.gnu.org/licenses). If not, see [GNU licenses](http://www.gnu.org/licenses).
*/ */
// decode-pcm is a command-line program for decoding/decompressing an adpcm file to a pcm file.
package main package main
import ( import (
@ -54,8 +52,7 @@ func main() {
fmt.Println("Read", len(comp), "bytes from file", inPath) fmt.Println("Read", len(comp), "bytes from file", inPath)
// Decode adpcm. // Decode adpcm.
numBlocks := len(comp) / adpcm.AdpcmBS decoded := bytes.NewBuffer(make([]byte, 0, len(comp)*4))
decoded := bytes.NewBuffer(make([]byte, 0, adpcm.PcmBS*numBlocks))
dec := adpcm.NewDecoder(decoded) dec := adpcm.NewDecoder(decoded)
_, err = dec.Write(comp) _, err = dec.Write(comp)
if err != nil { if err != nil {

7
exp/adpcm/encode-pcm/encode-pcm.go
View File

@ -2,9 +2,6 @@
NAME NAME
encode-pcm.go encode-pcm.go
DESCRIPTION
encode-pcm.go is a program for encoding/compressing a pcm file to an adpcm file.
AUTHOR AUTHOR
Trek Hopton <trek@ausocean.org> Trek Hopton <trek@ausocean.org>
@ -25,6 +22,7 @@ LICENSE
If not, see [GNU licenses](http://www.gnu.org/licenses). If not, see [GNU licenses](http://www.gnu.org/licenses).
*/ */
// encode-pcm is a command-line program for encoding/compressing a pcm file to an adpcm file.
package main package main
import ( import (
@ -54,8 +52,7 @@ func main() {
fmt.Println("Read", len(pcm), "bytes from file", inPath) fmt.Println("Read", len(pcm), "bytes from file", inPath)
// Encode adpcm. // Encode adpcm.
numBlocks := len(pcm) / adpcm.PcmBS comp := bytes.NewBuffer(make([]byte, 0, adpcm.EncBytes(len(pcm))))
comp := bytes.NewBuffer(make([]byte, 0, adpcm.AdpcmBS*numBlocks))
enc := adpcm.NewEncoder(comp) enc := adpcm.NewEncoder(comp)
_, err = enc.Write(pcm) _, err = enc.Write(pcm)
if err != nil { if err != nil {

5
exp/pcm/resample/resample.go
View File

@ -2,9 +2,6 @@
NAME NAME
resample.go resample.go
DESCRIPTION
resample.go is a program for resampling a pcm file.
AUTHOR AUTHOR
Trek Hopton <trek@ausocean.org> Trek Hopton <trek@ausocean.org>
@ -24,6 +21,8 @@ LICENSE
You should have received a copy of the GNU General Public License in gpl.txt. You should have received a copy of the GNU General Public License in gpl.txt.
If not, see [GNU licenses](http://www.gnu.org/licenses). If not, see [GNU licenses](http://www.gnu.org/licenses).
*/ */
// resample is a command-line program for resampling a pcm file.
package main package main
import ( import (

5
exp/pcm/stereo-to-mono/stereo-to-mono.go
View File

@ -2,9 +2,6 @@
NAME NAME
stereo-to-mono.go stereo-to-mono.go
DESCRIPTION
stereo-to-mono.go is a program for converting a mono pcm file to a stereo pcm file.
AUTHOR AUTHOR
Trek Hopton <trek@ausocean.org> Trek Hopton <trek@ausocean.org>
@ -24,6 +21,8 @@ LICENSE
You should have received a copy of the GNU General Public License in gpl.txt. You should have received a copy of the GNU General Public License in gpl.txt.
If not, see [GNU licenses](http://www.gnu.org/licenses). If not, see [GNU licenses](http://www.gnu.org/licenses).
*/ */
// stereo-to-mono is a command-line program for converting a mono pcm file to a stereo pcm file.
package main package main
import ( import (

288
protocol/rtcp/client.go Normal file
View File

@ -0,0 +1,288 @@
/*
NAME
client.go
DESCRIPTION
Client.go provides an implemntation of a basic RTCP Client that will send
receiver reports, and receive sender reports to parse relevant statistics.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package rtcp
import (
"encoding/binary"
"errors"
"fmt"
"math"
"net"
"sync"
"time"
"bitbucket.org/ausocean/av/protocol/rtp"
"bitbucket.org/ausocean/utils/logger"
)
const (
clientSSRC = 1 // Any non-zero value will do.
defaultClientName = "Client"
defaultSendInterval = 2 * time.Second
delayUnit = 1.0 / 65536.0
pkg = "rtcp: "
rtcpVer = 2
receiverBufSize = 200
)
// Log describes a function signature required by the RTCP for the purpose of
// logging.
type Log func(lvl int8, msg string, args ...interface{})
// Client is an RTCP Client that will handle receiving SenderReports from a server
// and sending out ReceiverReports.
type Client struct {
cAddr *net.UDPAddr // Address of client.
sAddr *net.UDPAddr // Address of RTSP server.
name string // Name of the client for source description purposes.
sourceSSRC uint32 // Source identifier of this client.
mu sync.Mutex // Will be used to change parameters during operation safely.
seq uint32 // Last RTP sequence number.
senderTs [8]byte // The timestamp of the last sender report.
interval time.Duration // Interval between sender report and receiver report.
receiveTime time.Time // Time last sender report was received.
buf [receiverBufSize]byte // Buf used to store the receiver report and source descriptions.
conn *net.UDPConn // The UDP connection used for receiving and sending RTSP packets.
wg sync.WaitGroup // This is used to wait for send and recv routines to stop when Client is stopped.
quit chan struct{} // Channel used to communicate quit signal to send and recv routines.
log Log // Used to log any messages.
rtpClt *rtp.Client
err chan error // Client will send any errors through this chan. Can be accessed by Err().
}
// NewClient returns a pointer to a new Client.
func NewClient(clientAddress, serverAddress string, rtpClt *rtp.Client, l Log) (*Client, error) {
c := &Client{
name: defaultClientName,
quit: make(chan struct{}),
interval: defaultSendInterval,
rtpClt: rtpClt,
log: l,
}
var err error
c.cAddr, err = net.ResolveUDPAddr("udp", clientAddress)
if err != nil {
return nil, errors.New(fmt.Sprintf("can't resolve Client address, failed with error: %v\n", err))
}
c.sAddr, err = net.ResolveUDPAddr("udp", serverAddress)
if err != nil {
return nil, errors.New(fmt.Sprintf("can't resolve server address, failed with error: %v\n", err))
}
c.conn, err = net.DialUDP("udp", c.cAddr, c.sAddr)
if err != nil {
return nil, errors.New(fmt.Sprintf("can't dial, failed with error: %v\n", err))
}
return c, nil
}
// SetSendInterval sets a custom receiver report send interval (default is 5 seconds.)
func (c *Client) SetSendInterval(d time.Duration) {
c.interval = d
}
// SetName sets a custom client name for use in receiver report source description.
// Default is "Client".
func (c *Client) SetName(name string) {
c.name = name
}
// Start starts the listen and send routines. This will start the process of
// receiving and parsing sender reports, and the process of sending receiver
// reports to the server.
func (c *Client) Start() {
c.log(logger.Debug, pkg+"Client is starting")
c.err = make(chan error)
c.wg.Add(2)
go c.recv()
go c.send()
}
// Stop sends a quit signal to the send and receive routines and closes the
// UDP connection. It will wait until both routines have returned.
func (c *Client) Stop() {
c.log(logger.Debug, pkg+"Client is stopping")
close(c.quit)
c.conn.Close()
c.wg.Wait()
close(c.err)
}
// Err provides read access to the Client err channel. This must be checked
// otherwise the client will block if an error encountered.
func (c *Client) Err() <-chan error {
return c.err
}
// recv reads from the UDP connection and parses SenderReports.
func (c *Client) recv() {
defer c.wg.Done()
c.log(logger.Debug, pkg+"Client is receiving")
buf := make([]byte, 4096)
for {
select {
case <-c.quit:
return
default:
n, _, err := c.conn.ReadFromUDP(buf)
if err != nil {
c.err <- err
continue
}
c.log(logger.Debug, pkg+"sender report received", "report", buf[:n])
c.parse(buf[:n])
}
}
}
// send writes receiver reports to the server.
func (c *Client) send() {
defer c.wg.Done()
c.log(logger.Debug, pkg+"Client is sending")
for {
select {
case <-c.quit:
return
default:
time.Sleep(c.interval)
report := ReceiverReport{
Header: Header{
Version: rtcpVer,
Padding: false,
ReportCount: 1,
Type: typeReceiverReport,
},
SenderSSRC: clientSSRC,
Blocks: []ReportBlock{
ReportBlock{
SourceIdentifier: c.rtpClt.SSRC(),
FractionLost: 0,
PacketsLost: math.MaxUint32,
HighestSequence: uint32((c.rtpClt.Cycles() << 16) | c.rtpClt.Sequence()),
Jitter: c.jitter(),
SenderReportTs: c.lastSenderTs(),
SenderReportDelay: c.delay(),
},
},
Extensions: nil,
}
description := Description{
Header: Header{
Version: rtcpVer,
Padding: false,
ReportCount: 1,
Type: typeDescription,
},
Chunks: []Chunk{
Chunk{
SSRC: clientSSRC,
Items: []SDESItem{
SDESItem{
Type: typeCName,
Text: []byte(c.name),
},
},
},
},
}
c.log(logger.Debug, pkg+"sending receiver report")
_, err := c.conn.Write(c.formPayload(&report, &description))
if err != nil {
c.err <- err
}
}
}
}
// formPayload takes a pointer to a ReceiverReport and a pointer to a
// Source Description and calls Bytes on both, writing to the underlying Client
// buf. A slice to the combined writtem memory is returned.
func (c *Client) formPayload(r *ReceiverReport, d *Description) []byte {
rl := len(r.Bytes(c.buf[:]))
dl := len(d.Bytes(c.buf[rl:]))
t := rl + dl
if t > cap(c.buf) {
panic("Client buf not big enough")
}
return c.buf[:t]
}
// parse will read important statistics from sender reports.
func (c *Client) parse(buf []byte) {
c.markReceivedTime()
t, err := ParseTimestamp(buf)
if err != nil {
c.err <- fmt.Errorf("could not get timestamp from sender report, failed with error: %v", err)
}
c.setSenderTs(t)
}
// jitter returns the interarrival jitter as described by RTCP specifications:
// https://tools.ietf.org/html/rfc3550
// TODO(saxon): complete this.
func (c *Client) jitter() uint32 {
return 0
}
// setSenderTs allows us to safely set the current sender report timestamp.
func (c *Client) setSenderTs(t Timestamp) {
c.mu.Lock()
binary.BigEndian.PutUint32(c.senderTs[:], t.Seconds)
binary.BigEndian.PutUint32(c.senderTs[4:], t.Fraction)
c.mu.Unlock()
}
// lastSenderTs returns the timestamp of the most recent sender report.
func (c *Client) lastSenderTs() uint32 {
c.mu.Lock()
t := binary.BigEndian.Uint32(c.senderTs[2:])
c.mu.Unlock()
return t
}
// delay returns the duration between the receive time of the last sender report
// and now. This is called when forming a receiver report.
func (c *Client) delay() uint32 {
c.mu.Lock()
t := c.receiveTime
c.mu.Unlock()
return uint32(time.Now().Sub(t).Seconds() / delayUnit)
}
// markReceivedTime is called when a sender report is received to mark the receive time.
func (c *Client) markReceivedTime() {
c.mu.Lock()
c.receiveTime = time.Now()
c.mu.Unlock()
}

232
protocol/rtcp/client_test.go Normal file
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@ -0,0 +1,232 @@
/*
NAME
client_test.go
DESCRIPTION
client_test.go contains testing utilities for functionality provided in client.go.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package rtcp
import (
"bytes"
"encoding/binary"
"fmt"
"math"
"net"
"strings"
"testing"
"time"
"bitbucket.org/ausocean/av/protocol/rtp"
"bitbucket.org/ausocean/utils/logger"
)
// TestFromPayload checks that formPayload is working as expected.
func TestFormPayload(t *testing.T) {
// Expected data from a valid RTCP packet.
expect := []byte{
0x81, 0xc9, 0x00, 0x07,
0xd6, 0xe0, 0x98, 0xda,
0x6f, 0xad, 0x40, 0xc6,
0x00, 0xff, 0xff, 0xff,
0x00, 0x01, 0x83, 0x08,
0x00, 0x00, 0x00, 0x20,
0xb9, 0xe1, 0x25, 0x2a,
0x00, 0x00, 0x2b, 0xf9,
0x81, 0xca, 0x00, 0x04,
0xd6, 0xe0, 0x98, 0xda,
0x01, 0x08, 0x73, 0x61,
0x78, 0x6f, 0x6e, 0x2d,
0x70, 0x63, 0x00, 0x00,
}
report := ReceiverReport{
Header: Header{
Version: 2,
Padding: false,
ReportCount: 1,
Type: typeReceiverReport,
},
SenderSSRC: 3605043418,
Blocks: []ReportBlock{
ReportBlock{
SourceIdentifier: 1873625286,
FractionLost: 0,
PacketsLost: math.MaxUint32,
HighestSequence: 99080,
Jitter: 32,
SenderReportTs: 3118540074,
SenderReportDelay: 11257,
},
},
Extensions: nil,
}
description := Description{
Header: Header{
Version: 2,
Padding: false,
ReportCount: 1,
Type: typeDescription,
},
Chunks: []Chunk{
Chunk{
SSRC: 3605043418,
Items: []SDESItem{
SDESItem{
Type: typeCName,
Text: []byte("saxon-pc"),
},
},
},
},
}
c := &Client{}
p := c.formPayload(&report, &description)
if !bytes.Equal(p, expect) {
t.Fatalf("unexpected result.\nGot: %v\n Want: %v\n", p, expect)
}
bufAddr := fmt.Sprintf("%p", c.buf[:])
pAddr := fmt.Sprintf("%p", p)
if bufAddr != pAddr {
t.Errorf("unexpected result.\nGot: %v\n want: %v\n", pAddr, bufAddr)
}
}
// dummyLogger will allow logging to be done by the testing pkg.
type dummyLogger testing.T
func (dl *dummyLogger) log(lvl int8, msg string, args ...interface{}) {
var l string
switch lvl {
case logger.Warning:
l = "warning"
case logger.Debug:
l = "debug"
case logger.Info:
l = "info"
case logger.Error:
l = "error"
case logger.Fatal:
l = "fatal"
}
msg = l + ": " + msg
for i := 0; i < len(args); i++ {
msg += " %v"
}
if len(args) == 0 {
dl.Log(msg + "\n")
return
}
dl.Logf(msg+"\n", args)
}
// TestReceiveAndSend tests basic RTCP client behaviour with a basic RTCP server.
// The RTCP client will send through receiver reports, and the RTCP server will
// respond with sender reports.
func TestReceiveAndSend(t *testing.T) {
const clientAddr, serverAddr = "localhost:8000", "localhost:8001"
rtpClt, err := rtp.NewClient("localhost:8002")
if err != nil {
t.Fatalf("unexpected error when creating RTP client: %v", err)
}
c, err := NewClient(
clientAddr,
serverAddr,
rtpClt,
(*dummyLogger)(t).log,
)
if err != nil {
t.Fatalf("unexpected error when creating client: %v\n", err)
}
go func() {
for {
err, ok := <-c.Err()
if ok {
const errConnClosed = "use of closed network connection"
if !strings.Contains(err.Error(), errConnClosed) {
t.Fatalf("error received from client error chan: %v\n", err)
}
} else {
return
}
}
}()
c.Start()
sAddr, err := net.ResolveUDPAddr("udp", serverAddr)
if err != nil {
t.Fatalf("could not resolve test server address, failed with error: %v", err)
}
cAddr, err := net.ResolveUDPAddr("udp", clientAddr)
if err != nil {
t.Fatalf("could not resolve client address, failed with error: %v", err)
}
conn, err := net.DialUDP("udp", sAddr, cAddr)
if err != nil {
t.Fatalf("could not dial, failed with error: %v\n", err)
}
buf := make([]byte, 4096)
for i := 0; i < 5; i++ {
t.Log("SERVER: waiting for receiver report\n")
n, _, _ := conn.ReadFromUDP(buf)
t.Logf("SERVER: receiver report received: \n%v\n", buf[:n])
now := time.Now().Second()
var time [8]byte
binary.BigEndian.PutUint64(time[:], uint64(now))
msw := binary.BigEndian.Uint32(time[:4])
lsw := binary.BigEndian.Uint32(time[4:])
report := SenderReport{
Header: Header{
Version: rtcpVer,
Padding: false,
ReportCount: 0,
Type: typeSenderReport,
},
SSRC: 1234567,
TimestampMSW: msw,
TimestampLSW: lsw,
RTPTimestamp: 0,
PacketCount: 0,
OctetCount: 0,
}
r := report.Bytes()
t.Logf("SERVER: sending sender report: \n%v\n", r)
_, err := conn.Write(r)
if err != nil {
t.Errorf("did not expect error: %v\n", err)
}
}
c.Stop()
}

60
protocol/rtcp/parse.go Normal file
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@ -0,0 +1,60 @@
/*
NAME
parse.go
DESCRIPTION
parse.go contains functionality for parsing RTCP packets.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package rtcp
import (
"encoding/binary"
"errors"
)
// Timestamp describes an NTP timestamp, see https://tools.ietf.org/html/rfc1305
type Timestamp struct {
Seconds uint32
Fraction uint32
}
// ParseTimestamp gets the timestamp from a receiver report and returns it as
// a Timestamp as defined above. If the given bytes do not represent a valid
// receiver report, an error is returned.
func ParseTimestamp(buf []byte) (Timestamp, error) {
if len(buf) < 4 {
return Timestamp{}, errors.New("bad RTCP packet, not of sufficient length")
}
if (buf[0]&0xc0)>>6 != rtcpVer {
return Timestamp{}, errors.New("incompatible RTCP version")
}
if buf[1] != typeSenderReport {
return Timestamp{}, errors.New("RTCP packet is not of sender report type")
}
return Timestamp{
Seconds: binary.BigEndian.Uint32(buf[8:]),
Fraction: binary.BigEndian.Uint32(buf[12:]),
}, nil
}

61
protocol/rtcp/parse_test.go Normal file
View File

@ -0,0 +1,61 @@
/*
NAME
parse_test.go
DESCRIPTION
parse_test.go provides testing utilities for functionality found in parse.go.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package rtcp
import (
"testing"
)
// TestTimestamp checks that Timestamp correctly returns the most signicicant
// word, and least signiciant word, of a receiver report timestamp.
func TestTimestamp(t *testing.T) {
const expectedMSW = 2209003992
const expectedLSW = 1956821460
report := []byte{
0x80, 0xc8, 0x00, 0x06,
0x6f, 0xad, 0x40, 0xc6,
0x83, 0xaa, 0xb9, 0xd8, // Most significant word of timestamp (2209003992)
0x74, 0xa2, 0xb9, 0xd4, // Least significant word of timestamp (1956821460)
0x4b, 0x1c, 0x5a, 0xa5,
0x00, 0x00, 0x00, 0x66,
0x00, 0x01, 0xc2, 0xc5,
}
ts, err := ParseTimestamp(report)
if err != nil {
t.Fatalf("did not expect error: %v", err)
}
if ts.Seconds != expectedMSW {
t.Errorf("most significant word of timestamp is not what's expected. \nGot: %v\n Want: %v\n", ts.Seconds, expectedMSW)
}
if ts.Fraction != expectedLSW {
t.Errorf("least significant word of timestamp is not what's expected. \nGot: %v\n Want: %v\n", ts.Fraction, expectedLSW)
}
}

222
protocol/rtcp/rtcp.go Normal file
View File

@ -0,0 +1,222 @@
/*
NAME
rtcp.go
DESCRIPTION
rtcp.go contains structs to describe RTCP packets, and functionality to form
[]bytes of these structs.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
// Package RTCP provides RTCP data structures and a client for communicating
// with an RTCP service.
package rtcp
import (
"encoding/binary"
)
// RTCP packet types.
const (
typeSenderReport = 200
typeReceiverReport = 201
typeDescription = 202
)
// Source Description Item types.
const (
typeCName = 1
)
const (
reportBlockSize = 6
senderReportSize = 28
)
// ReceiverReport describes an RTCP receiver report packet.
type ReceiverReport struct {
Header // Standard RTCP packet header.
SenderSSRC uint32 // SSRC of the sender of this report.
Blocks []ReportBlock // Report blocks.
Extensions [][4]byte // Contains any extensions to the packet.
}
// Bytes returns a []byte of the ReceiverReport r.
func (r *ReceiverReport) Bytes(buf []byte) []byte {
l := 8 + 4*reportBlockSize*len(r.Blocks) + 4*len(r.Extensions)
if buf == nil || cap(buf) < l {
buf = make([]byte, l)
}
buf = buf[:l]
l = 1 + reportBlockSize*len(r.Blocks) + len(r.Extensions)
r.writeHeader(buf, l)
binary.BigEndian.PutUint32(buf[4:], r.SenderSSRC)
idx := 8
for _, b := range r.Blocks {
binary.BigEndian.PutUint32(buf[idx:], b.SourceIdentifier)
binary.BigEndian.PutUint32(buf[idx+4:], b.PacketsLost)
buf[idx+4] = b.FractionLost
binary.BigEndian.PutUint32(buf[idx+8:], b.HighestSequence)
binary.BigEndian.PutUint32(buf[idx+12:], b.Jitter)
binary.BigEndian.PutUint32(buf[idx+16:], b.SenderReportTs)
binary.BigEndian.PutUint32(buf[idx+20:], b.SenderReportDelay)
idx += 24
}
for _, e := range r.Extensions {
copy(buf[idx:], e[:])
idx += 4
}
return buf
}
// ReportBlock describes an RTCP report block used in Sender/Receiver Reports.
type ReportBlock struct {
SourceIdentifier uint32 // Source identifier.
FractionLost uint8 // Fraction of packets lost.
PacketsLost uint32 // Cumulative number of packets lost.
HighestSequence uint32 // Extended highest sequence number received.
Jitter uint32 // Interarrival jitter.
SenderReportTs uint32 // Last sender report timestamp.
SenderReportDelay uint32 // Delay since last sender report.
}
// Description describes a source description RTCP packet.
type Description struct {
Header // Standard RTCP packet header.
Chunks []Chunk // Chunks to describe items of each SSRC.
}
// Bytes returns an []byte of the Description d.
func (d *Description) Bytes(buf []byte) []byte {
bodyLen := d.bodyLen()
rem := bodyLen % 4
if rem != 0 {
bodyLen += 4 - rem
}
l := 4 + bodyLen
if buf == nil || cap(buf) < l {
buf = make([]byte, l)
}
buf = buf[:l]
d.writeHeader(buf, bodyLen/4)
idx := 4
for _, c := range d.Chunks {
binary.BigEndian.PutUint32(buf[idx:], c.SSRC)
idx += 4
for _, i := range c.Items {
buf[idx] = i.Type
buf[idx+1] = byte(len(i.Text))
idx += 2
copy(buf[idx:], i.Text)
idx += len(i.Text)
}
}
return buf
}
// bodyLen calculates the body length of a source description packet in bytes.
func (d *Description) bodyLen() int {
var l int
for _, c := range d.Chunks {
l += c.len()
}
return l
}
// SenderReport describes an RTCP sender report.
type SenderReport struct {
Header // Standard RTCP header.
SSRC uint32 // SSRC of sender.
TimestampMSW uint32 // Most significant word of timestamp.
TimestampLSW uint32 // Least significant word of timestamp.
RTPTimestamp uint32 // Current RTP timestamp.
PacketCount uint32 // Senders packet count.
OctetCount uint32 // Senders octet count.
// Report blocks (unimplemented)
// ...
}
// Bytes returns a []byte of the SenderReport.
func (r *SenderReport) Bytes() []byte {
buf := make([]byte, senderReportSize)
r.writeHeader(buf, senderReportSize-1)
for i, w := range []uint32{
r.SSRC,
r.TimestampMSW,
r.TimestampLSW,
r.RTPTimestamp,
r.PacketCount,
r.OctetCount,
} {
binary.BigEndian.PutUint32(buf[i+4:], w)
}
return buf
}
// Header describes a standard RTCP packet header.
type Header struct {
Version uint8 // RTCP version.
Padding bool // Padding indicator.
ReportCount uint8 // Number of reports contained.
Type uint8 // Type of RTCP packet.
}
// SDESItem describes a source description item.
type SDESItem struct {
Type uint8 // Type of item.
Text []byte // Item text.
}
// Chunk describes a source description chunk for a given SSRC.
type Chunk struct {
SSRC uint32 // SSRC of the source being described by the below items.
Items []SDESItem // Items describing the source.
}
// len returns the len of a chunk in bytes.
func (c *Chunk) len() int {
tot := 4
for _, i := range c.Items {
tot += 2 + len(i.Text)
}
return tot
}
// writeHeader writes the standard RTCP header given a buffer to write to and l
// the RTCP body length that needs to be encoded into the header.
func (h Header) writeHeader(buf []byte, l int) {
buf[0] = h.Version<<6 | asByte(h.Padding)<<5 | 0x1f&h.ReportCount
buf[1] = h.Type
binary.BigEndian.PutUint16(buf[2:], uint16(l))
}
func asByte(b bool) byte {
if b {
return 0x01
}
return 0x00
}

112
protocol/rtcp/rtcp_test.go Normal file
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@ -0,0 +1,112 @@
/*
NAME
rtcp_test.go
DESCRIPTION
rtcp_test.go contains testing utilities for functionality provided in rtcp_test.go.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package rtcp
import (
"bytes"
"math"
"testing"
)
// TestReceiverReportBytes checks that we can correctly obtain a []byte of an
// RTCP receiver report from the struct representation.
func TestReceiverReportBytes(t *testing.T) {
expect := []byte{
0x81, 0xc9, 0x00, 0x07,
0xd6, 0xe0, 0x98, 0xda,
0x6f, 0xad, 0x40, 0xc6,
0x00, 0xff, 0xff, 0xff,
0x00, 0x01, 0x83, 0x08,
0x00, 0x00, 0x00, 0x20,
0xb9, 0xe1, 0x25, 0x2a,
0x00, 0x00, 0x2b, 0xf9,
}
report := ReceiverReport{
Header: Header{
Version: 2,
Padding: false,
ReportCount: 1,
Type: typeReceiverReport,
},
SenderSSRC: 3605043418,
Blocks: []ReportBlock{
ReportBlock{
SourceIdentifier: 1873625286,
FractionLost: 0,
PacketsLost: math.MaxUint32,
HighestSequence: 99080,
Jitter: 32,
SenderReportTs: 3118540074,
SenderReportDelay: 11257,
},
},
Extensions: nil,
}
got := report.Bytes(nil)
if !bytes.Equal(got, expect) {
t.Errorf("did not get expected result. \nGot: %v\nWant: %v\n", got, expect)
}
}
// TestSourceDescriptionBytes checks that we can correctly obtain a []byte of an
// RTCP source description from the struct representation.
func TestSourceDescriptionBytes(t *testing.T) {
expect := []byte{
0x81, 0xca, 0x00, 0x04,
0xd6, 0xe0, 0x98, 0xda,
0x01, 0x08, 0x73, 0x61,
0x78, 0x6f, 0x6e, 0x2d,
0x70, 0x63, 0x00, 0x00,
}
description := Description{
Header: Header{
Version: 2,
Padding: false,
ReportCount: 1,
Type: typeDescription,
},
Chunks: []Chunk{
Chunk{
SSRC: 3605043418,
Items: []SDESItem{
SDESItem{
Type: typeCName,
Text: []byte("saxon-pc"),
},
},
},
},
}
got := description.Bytes(nil)
if !bytes.Equal(got, expect) {
t.Errorf("Did not get expected result.\nGot: %v\n Want: %v\n", got, expect)
}
}

6
protocol/rtmp/rtmp_test.go
View File

@ -38,7 +38,7 @@ import (
"testing" "testing"
"time" "time"
"bitbucket.org/ausocean/av/codec/lex" "bitbucket.org/ausocean/av/codec/h264"
"bitbucket.org/ausocean/av/container/flv" "bitbucket.org/ausocean/av/container/flv"
) )
@ -199,7 +199,7 @@ func TestFromFrame(t *testing.T) {
if err != nil { if err != nil {
t.Errorf("Failed to create flv encoder with error: %v", err) t.Errorf("Failed to create flv encoder with error: %v", err)
} }
err = lex.H264(flvEncoder, bytes.NewReader(videoData), time.Second/time.Duration(frameRate)) err = h264.Lex(flvEncoder, bytes.NewReader(videoData), time.Second/time.Duration(frameRate))
if err != nil { if err != nil {
t.Errorf("Lexing failed with error: %v", err) t.Errorf("Lexing failed with error: %v", err)
} }
@ -251,7 +251,7 @@ func TestFromFile(t *testing.T) {
if err != nil { if err != nil {
t.Fatalf("failed to create encoder: %v", err) t.Fatalf("failed to create encoder: %v", err)
} }
err = lex.H264(flvEncoder, f, time.Second/time.Duration(25)) err = h264.Lex(flvEncoder, f, time.Second/time.Duration(25))
if err != nil { if err != nil {
t.Errorf("Lexing and encoding failed with error: %v", err) t.Errorf("Lexing and encoding failed with error: %v", err)
} }

118
protocol/rtp/client.go Normal file
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@ -0,0 +1,118 @@
/*
NAME
client.go
DESCRIPTION
client.go provides an RTP client.
AUTHOR
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean).
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package rtp
import (
"net"
"sync"
)
// Client describes an RTP client that can receive an RTP stream and implements
// io.Reader.
type Client struct {
r *PacketReader
ssrc uint32
mu sync.Mutex
sequence uint16
cycles uint16
}
// NewClient returns a pointer to a new Client.
//
// addr is the address of form <ip>:<port> that we expect to receive
// RTP at.
func NewClient(addr string) (*Client, error) {
c := &Client{r: &PacketReader{}}
a, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
}
c.r.PacketConn, err = net.ListenUDP("udp", a)
if err != nil {
return nil, err
}
return c, nil
}
// SSRC returns the identified for the source from which the RTP packets being
// received are coming from.
func (c *Client) SSRC() uint32 {
return c.ssrc
}
// Read implements io.Reader.
func (c *Client) Read(p []byte) (int, error) {
n, err := c.r.Read(p)
if err != nil {
return n, err
}
if c.ssrc == 0 {
c.ssrc, _ = SSRC(p[:n])
}
s, _ := Sequence(p[:n])
c.setSequence(s)
return n, err
}
// setSequence sets the most recently received sequence number, and updates the
// cycles count if the sequence number has rolled over.
func (c *Client) setSequence(s uint16) {
c.mu.Lock()
if s < c.sequence {
c.cycles++
}
c.sequence = s
c.mu.Unlock()
}
// Sequence returns the most recent RTP packet sequence number received.
func (c *Client) Sequence() uint16 {
c.mu.Lock()
defer c.mu.Unlock()
return c.sequence
}
// Cycles returns the number of RTP sequence number cycles that have been received.
func (c *Client) Cycles() uint16 {
c.mu.Lock()
defer c.mu.Unlock()
return c.cycles
}
// PacketReader provides an io.Reader interface to an underlying UDP PacketConn.
type PacketReader struct {
net.PacketConn
}
// Read implements io.Reader.
func (r PacketReader) Read(b []byte) (int, error) {
n, _, err := r.PacketConn.ReadFrom(b)
return n, err
}

125
protocol/rtp/client_test.go Normal file
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@ -0,0 +1,125 @@
/*
NAME
client_test.go
DESCRIPTION
client_test.go provides testing utilities to check RTP client functionality
provided in client.go.
AUTHOR
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean).
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package rtp
import (
"bytes"
"fmt"
"io"
"net"
"testing"
)
// TestReceive checks that the Client can correctly receive RTP packets and
// perform a specificed operation on the packets before storing in the ringBuffer.
func TestReceive(t *testing.T) {
const (
clientAddr = "localhost:8000"
packetsToSend = 20
)
testErr := make(chan error)
serverErr := make(chan error)
done := make(chan struct{})
clientReady := make(chan struct{})
var c *Client
// Start routine to read from client.
go func() {
// Create and start the client.
var err error
c, err = NewClient(clientAddr)
if err != nil {
testErr <- fmt.Errorf("could not create client, failed with error: %v\n", err)
}
close(clientReady)
// Read packets using the client and check them with expected.
var packetsReceived int
buf := make([]byte, 4096)
for packetsReceived != packetsToSend {
n, err := c.Read(buf)
switch err {
case nil:
case io.EOF:
continue
default:
testErr <- fmt.Errorf("unexpected error from c.Read: %v\n", err)
}
// Create expected data and apply operation if there is one.
expect := (&Packet{V: rtpVer, Payload: []byte{byte(packetsReceived)}}).Bytes(nil)
// Compare.
got := buf[:n]
if !bytes.Equal(got, expect) {
testErr <- fmt.Errorf("did not get expected result. \nGot: %v\n Want: %v\n", got, expect)
}
packetsReceived++
}
close(done)
}()
// Start the RTP server.
go func() {
<-clientReady
cAddr, err := net.ResolveUDPAddr("udp", clientAddr)
if err != nil {
serverErr <- fmt.Errorf("could not resolve server address, failed with err: %v\n", err)
}
conn, err := net.DialUDP("udp", nil, cAddr)
if err != nil {
serverErr <- fmt.Errorf("could not dial udp, failed with err: %v\n", err)
}
// Send packets to the client.
for i := 0; i < packetsToSend; i++ {
p := (&Packet{V: rtpVer, Payload: []byte{byte(i)}}).Bytes(nil)
_, err := conn.Write(p)
if err != nil {
serverErr <- fmt.Errorf("could not write packet to conn, failed with err: %v\n", err)
}
}
}()
<-clientReady
loop:
for {
select {
case err := <-testErr:
t.Fatal(err)
case err := <-serverErr:
t.Fatal(err)
case <-done:
break loop
default:
}
}
}

2
protocol/rtp/encoder.go
View File

@ -97,7 +97,7 @@ func min(a, b int) int {
// Encode takes a nalu unit and encodes it into an rtp packet and // Encode takes a nalu unit and encodes it into an rtp packet and
// writes to the io.Writer given in NewEncoder // writes to the io.Writer given in NewEncoder
func (e *Encoder) Encode(payload []byte) error { func (e *Encoder) Encode(payload []byte) error {
pkt := Pkt{ pkt := Packet{
V: rtpVer, // version V: rtpVer, // version
X: false, // header extension X: false, // header extension
CC: 0, // CSRC count CC: 0, // CSRC count

51
protocol/rtp/parse.go
View File

@ -34,14 +34,25 @@ import (
const badVer = "incompatible RTP version" const badVer = "incompatible RTP version"
// Payload returns the payload from an RTP packet provided the version is // Marker returns the state of the RTP marker bit, and an error if parsing fails.
// compatible, otherwise an error is returned. func Marker(d []byte) (bool, error) {
func Payload(d []byte) ([]byte, error) {
if len(d) < defaultHeadSize { if len(d) < defaultHeadSize {
panic("invalid RTP packet length") panic("invalid RTP packet length")
} }
if version(d) != rtpVer { if version(d) != rtpVer {
return nil, errors.New(badVer) return false, errors.New(badVer)
}
return d[1]&0x80 != 0, nil
}
// Payload returns the payload from an RTP packet provided the version is
// compatible, otherwise an error is returned.
func Payload(d []byte) ([]byte, error) {
err := checkPacket(d)
if err != nil {
return nil, err
} }
extLen := 0 extLen := 0
if hasExt(d) { if hasExt(d) {
@ -51,6 +62,38 @@ func Payload(d []byte) ([]byte, error) {
return d[payloadIdx:], nil return d[payloadIdx:], nil
} }
// SSRC returns the source identifier from an RTP packet. An error is return if
// the packet is not valid.
func SSRC(d []byte) (uint32, error) {
err := checkPacket(d)
if err != nil {
return 0, err
}
return binary.BigEndian.Uint32(d[8:]), nil
}
// Sequence returns the sequence number of an RTP packet. An error is returned
// if the packet is not valid.
func Sequence(d []byte) (uint16, error) {
err := checkPacket(d)
if err != nil {
return 0, err
}
return binary.BigEndian.Uint16(d[2:]), nil
}
// checkPacket checks the validity of the packet, firstly by checking size and
// then also checking that version is compatible with these utilities.
func checkPacket(d []byte) error {
if len(d) < defaultHeadSize {
return errors.New("invalid RTP packet length")
}
if version(d) != rtpVer {
return errors.New(badVer)
}
return nil
}
// hasExt returns true if an extension is present in the RTP packet. // hasExt returns true if an extension is present in the RTP packet.
func hasExt(d []byte) bool { func hasExt(d []byte) bool {
return (d[0] & 0x10 >> 4) == 1 return (d[0] & 0x10 >> 4) == 1

14
protocol/rtp/parse_test.go
View File

@ -35,7 +35,7 @@ import (
// TestVersion checks that we can correctly get the version from an RTP packet. // TestVersion checks that we can correctly get the version from an RTP packet.
func TestVersion(t *testing.T) { func TestVersion(t *testing.T) {
const expect = 1 const expect = 1
got := version((&Pkt{V: expect}).Bytes(nil)) got := version((&Packet{V: expect}).Bytes(nil))
if got != expect { if got != expect {
t.Errorf("unexpected version for RTP packet. Got: %v\n Want: %v\n", got, expect) t.Errorf("unexpected version for RTP packet. Got: %v\n Want: %v\n", got, expect)
} }
@ -46,7 +46,7 @@ func TestVersion(t *testing.T) {
func TestCsrcCount(t *testing.T) { func TestCsrcCount(t *testing.T) {
const ver, expect = 2, 2 const ver, expect = 2, 2
pkt := (&Pkt{ pkt := (&Packet{
V: ver, V: ver,
CC: expect, CC: expect,
CSRC: make([][4]byte, expect), CSRC: make([][4]byte, expect),
@ -64,7 +64,7 @@ func TestHasExt(t *testing.T) {
const ver = 2 const ver = 2
// First check for when there is an extension field. // First check for when there is an extension field.
pkt := &Pkt{ pkt := &Packet{
V: ver, V: ver,
X: true, X: true,
Extension: ExtensionHeader{ Extension: ExtensionHeader{
@ -93,19 +93,19 @@ func TestPayload(t *testing.T) {
expect := []byte{0x01, 0x02, 0x03, 0x04, 0x05} expect := []byte{0x01, 0x02, 0x03, 0x04, 0x05}
testPkts := [][]byte{ testPkts := [][]byte{
(&Pkt{ (&Packet{
V: ver, V: ver,
Payload: expect, Payload: expect,
}).Bytes(nil), }).Bytes(nil),
(&Pkt{ (&Packet{
V: ver, V: ver,
CC: 3, CC: 3,
CSRC: make([][4]byte, 3), CSRC: make([][4]byte, 3),
Payload: expect, Payload: expect,
}).Bytes(nil), }).Bytes(nil),
(&Pkt{ (&Packet{
V: ver, V: ver,
X: true, X: true,
Extension: ExtensionHeader{ Extension: ExtensionHeader{
@ -115,7 +115,7 @@ func TestPayload(t *testing.T) {
Payload: expect, Payload: expect,
}).Bytes(nil), }).Bytes(nil),
(&Pkt{ (&Packet{
V: ver, V: ver,
CC: 3, CC: 3,
CSRC: make([][4]byte, 3), CSRC: make([][4]byte, 3),

4
protocol/rtp/rtp.go
View File

@ -46,7 +46,7 @@ const (
// Pkt provides fields consistent with RFC3550 definition of an rtp packet // Pkt provides fields consistent with RFC3550 definition of an rtp packet
// The padding indicator does not need to be set manually, only the padding length // The padding indicator does not need to be set manually, only the padding length
type Pkt struct { type Packet struct {
V uint8 // Version (currently 2). V uint8 // Version (currently 2).
p bool // Padding indicator (0 => padding, 1 => padding). p bool // Padding indicator (0 => padding, 1 => padding).
X bool // Extension header indicator. X bool // Extension header indicator.
@ -69,7 +69,7 @@ type ExtensionHeader struct {
} }
// Bytes provides a byte slice of the packet // Bytes provides a byte slice of the packet
func (p *Pkt) Bytes(buf []byte) []byte { func (p *Packet) Bytes(buf []byte) []byte {
// Calculate the required length for the RTP packet. // Calculate the required length for the RTP packet.
headerExtensionLen := 0 headerExtensionLen := 0
if p.X { if p.X {

10
protocol/rtp/rtp_test.go
View File

@ -35,13 +35,13 @@ import (
// TODO (saxon): add more tests // TODO (saxon): add more tests
var rtpTests = []struct { var rtpTests = []struct {
num int num int
pkt Pkt pkt Packet
want []byte want []byte
}{ }{
// No padding, no CSRC and no extension. // No padding, no CSRC and no extension.
{ {
num: 1, num: 1,
pkt: Pkt{ pkt: Packet{
V: 2, V: 2,
p: false, p: false,
X: false, X: false,
@ -67,7 +67,7 @@ var rtpTests = []struct {
// With padding. // With padding.
{ {
num: 2, num: 2,
pkt: Pkt{ pkt: Packet{
V: 2, V: 2,
p: true, p: true,
X: false, X: false,
@ -101,7 +101,7 @@ var rtpTests = []struct {
// With padding and CSRC. // With padding and CSRC.
{ {
num: 3, num: 3,
pkt: Pkt{ pkt: Packet{
V: 2, V: 2,
p: true, p: true,
X: false, X: false,
@ -141,7 +141,7 @@ var rtpTests = []struct {
// With padding, CSRC and extension. // With padding, CSRC and extension.
{ {
num: 4, num: 4,
pkt: Pkt{ pkt: Packet{
V: 2, V: 2,
p: true, p: true,
X: true, X: true,

141
protocol/rtsp/client.go Normal file
View File

@ -0,0 +1,141 @@
/*
NAME
client.go
DESCRIPTION
client.go provides a Client type providing functionality to send RTSP requests
of methods DESCRIBE, OPTIONS, SETUP and PLAY to an RTSP server.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean).
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package rtsp
import (
"net"
"net/url"
"strconv"
)
// Client describes an RTSP Client.
type Client struct {
cSeq int
addr string
url *url.URL
conn net.Conn
sessionID string
}
// NewClient returns a pointer to a new Client and the local address of the
// RTSP connection. The address addr will be parsed and a connection to the
// RTSP server will be made.
func NewClient(addr string) (c *Client, local, remote *net.TCPAddr, err error) {
c = &Client{addr: addr}
c.url, err = url.Parse(addr)
if err != nil {
return nil, nil,nil, err
}
c.conn, err = net.Dial("tcp", c.url.Host)
if err != nil {
return nil, nil, nil, err
}
local = c.conn.LocalAddr().(*net.TCPAddr)
remote = c.conn.RemoteAddr().(*net.TCPAddr)
return
}
// Close closes the RTSP connection.
func (c *Client) Close() error {
return c.conn.Close()
}
// Describe forms and sends an RTSP request of method DESCRIBE to the RTSP server.
func (c *Client) Describe() (*Response, error) {
req, err := NewRequest("DESCRIBE", c.nextCSeq(), c.url, nil)
if err != nil {
return nil, err
}
req.Header.Add("Accept", "application/sdp")
return c.Do(req)
}
// Options forms and sends an RTSP request of method OPTIONS to the RTSP server.
func (c *Client) Options() (*Response, error) {
req, err := NewRequest("OPTIONS", c.nextCSeq(), c.url, nil)
if err != nil {
return nil, err
}
return c.Do(req)
}
// Setup forms and sends an RTSP request of method SETUP to the RTSP server.
func (c *Client) Setup(track, transport string) (*Response, error) {
u, err := url.Parse(c.addr + "/" + track)
if err != nil {
return nil, err
}
req, err := NewRequest("SETUP", c.nextCSeq(), u, nil)
if err != nil {
return nil, err
}
req.Header.Add("Transport", transport)
resp, err := c.Do(req)
if err != nil {
return nil, err
}
c.sessionID = resp.Header.Get("Session")
return resp, err
}
// Play forms and sends an RTSP request of method PLAY to the RTSP server
func (c *Client) Play() (*Response, error) {
req, err := NewRequest("PLAY", c.nextCSeq(), c.url, nil)
if err != nil {
return nil, err
}
req.Header.Add("Session", c.sessionID)
return c.Do(req)
}
// Do sends the given RTSP request req, reads any responses and returns the response
// and any errors.
func (c *Client) Do(req *Request) (*Response, error) {
err := req.Write(c.conn)
if err != nil {
return nil, err
}
resp, err := ReadResponse(c.conn)
if err != nil {
return nil, err
}
return resp, nil
}
// nextCSeq provides the next CSeq number for the next RTSP request.
func (c *Client) nextCSeq() string {
c.cSeq++
return strconv.Itoa(c.cSeq)
}

182
protocol/rtsp/rtsp.go Normal file
View File

@ -0,0 +1,182 @@
/*
NAME
rtsp.go
DESCRIPTION
rtsp.go provides functionality for forming and sending RTSP requests for
methods, DESCRIBE, OPTIONS, SETUP and PLAY, as described by
the RTSP standards, see https://tools.ietf.org/html/rfc7826
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean).
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
// Package rtsp provides an RTSP client implementation and methods for
// communication with an RTSP server to request video.
package rtsp
import (
"bufio"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"strings"
)
// Minimum response size to be considered valid in bytes.
const minResponse = 12
var errInvalidResponse = errors.New("invalid response")
// Request describes an RTSP request.
type Request struct {
Method string
URL *url.URL
Proto string
ProtoMajor int
ProtoMinor int
Header http.Header
ContentLength int
Body io.ReadCloser
}
// NewRequest returns a pointer to a new Request.
func NewRequest(method, cSeq string, u *url.URL, body io.ReadCloser) (*Request, error) {
req := &Request{
Method: method,
URL: u,
Proto: "RTSP",
ProtoMajor: 1,
ProtoMinor: 0,
Header: map[string][]string{"CSeq": []string{cSeq}},
Body: body,
}
return req, nil
}
// Write writes the request r to the given io.Writer w.
func (r *Request) Write(w io.Writer) error {
_, err := w.Write([]byte(r.String()))
return err
}
// String returns a formatted string of the Request.
func (r Request) String() string {
var b strings.Builder
fmt.Fprintf(&b, "%s %s %s/%d.%d\r\n", r.Method, r.URL.String(), r.Proto, r.ProtoMajor, r.ProtoMinor)
for k, v := range r.Header {
for _, v := range v {
fmt.Fprintf(&b, "%s: %s\r\n", k, v)
}
}
b.WriteString("\r\n")
if r.Body != nil {
s, _ := ioutil.ReadAll(r.Body)
b.WriteString(string(s))
}
return b.String()
}
// Response describes an RTSP response.
type Response struct {
Proto string
ProtoMajor int
ProtoMinor int
StatusCode int
ContentLength int
Header http.Header
Body io.ReadCloser
}
// String returns a formatted string of the Response.
func (r Response) String() string {
var b strings.Builder
fmt.Fprintf(&b, "%s/%d.%d %d\n", r.Proto, r.ProtoMajor, r.ProtoMinor, r.StatusCode)
for k, v := range r.Header {
for _, v := range v {
fmt.Fprintf(&b, "%s: %s", k, v)
}
}
return b.String()
}
// ReadResponse will read the response of the RTSP request from the connection,
// and return a pointer to a new Response.
func ReadResponse(r io.Reader) (*Response, error) {
resp := &Response{Header: make(map[string][]string)}
scanner := bufio.NewScanner(r)
// Read the first line.
scanner.Scan()
err := scanner.Err()
if err != nil {
return nil, err
}
s := scanner.Text()
if len(s) < minResponse || !strings.HasPrefix(s, "RTSP/") {
return nil, errInvalidResponse
}
resp.Proto = "RTSP"
n, err := fmt.Sscanf(s[5:], "%d.%d %d", &resp.ProtoMajor, &resp.ProtoMinor, &resp.StatusCode)
if err != nil || n != 3 {
return nil, fmt.Errorf("could not Sscanf response, error: %v", err)
}
// Read headers.
for scanner.Scan() {
err = scanner.Err()
if err != nil {
return nil, err
}
parts := strings.SplitN(scanner.Text(), ":", 2)
if len(parts) < 2 {
break
}
resp.Header.Add(strings.TrimSpace(parts[0]), strings.TrimSpace(parts[1]))
}
// Get the content length from the header.
resp.ContentLength, _ = strconv.Atoi(resp.Header.Get("Content-Length"))
resp.Body = closer{r}
return resp, nil
}
type closer struct {
io.Reader
}
func (c closer) Close() error {
if c.Reader == nil {
return nil
}
defer func() {
c.Reader = nil
}()
if r, ok := c.Reader.(io.ReadCloser); ok {
return r.Close()
}
return nil
}

344
protocol/rtsp/rtsp_test.go Normal file
View File

@ -0,0 +1,344 @@
/*
NAME
0x r,tsp_test.go
DESCRIPTION
rtsp_test.go provides a test to check functionality provided in rtsp.go.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean).
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
*/
package rtsp
import (
"bytes"
"errors"
"fmt"
"io"
"net"
"net/url"
"strings"
"testing"
"time"
"unicode"
)
// The max request size we should get in bytes.
const maxRequest = 1024
// TestMethods checks that we can correctly form requests for each of the RTSP
// methods supported in the rtsp pkg. This test also checks that communication
// over a TCP connection is performed correctly.
func TestMethods(t *testing.T) {
const dummyURL = "rtsp://admin:admin@192.168.0.50:8554/CH001.sdp"
url, err := url.Parse(dummyURL)
if err != nil {
t.Fatalf("could not parse dummy address, failed with err: %v", err)
}
// tests holds tests which consist of a function used to create and write a
// request of a particular method, and also the expected request bytes
// to be received on the server side. The bytes in these tests have been
// obtained from a valid RTSP communication cltion..
tests := []struct {
method func(c *Client) (*Response, error)
expected []byte
}{
{
method: func(c *Client) (*Response, error) {
req, err := NewRequest("DESCRIBE", c.nextCSeq(), url, nil)
if err != nil {
return nil, err
}
req.Header.Add("Accept", "application/sdp")
return c.Do(req)
},
expected: []byte{
0x44, 0x45, 0x53, 0x43, 0x52, 0x49, 0x42, 0x45, 0x20, 0x72, 0x74, 0x73, 0x70, 0x3a, 0x2f, 0x2f, // |DESCRIBE rtsp://|
0x61, 0x64, 0x6d, 0x69, 0x6e, 0x3a, 0x61, 0x64, 0x6d, 0x69, 0x6e, 0x40, 0x31, 0x39, 0x32, 0x2e, // |admin:admin@192.|
0x31, 0x36, 0x38, 0x2e, 0x30, 0x2e, 0x35, 0x30, 0x3a, 0x38, 0x35, 0x35, 0x34, 0x2f, 0x43, 0x48, // |168.0.50:8554/CH|
0x30, 0x30, 0x31, 0x2e, 0x73, 0x64, 0x70, 0x20, 0x52, 0x54, 0x53, 0x50, 0x2f, 0x31, 0x2e, 0x30, // |001.sdp RTSP/1.0|
0x0d, 0x0a, 0x43, 0x53, 0x65, 0x71, 0x3a, 0x20, 0x32, 0x0d, 0x0a, 0x41, 0x63, 0x63, 0x65, 0x70, // |..CSeq: 2..Accep|
0x74, 0x3a, 0x20, 0x61, 0x70, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x73, // |t: application/s|
0x64, 0x70, 0x0d, 0x0a, 0x0d, 0x0a, /* */ // |dp....|
},
},
{
method: func(c *Client) (*Response, error) {
req, err := NewRequest("OPTIONS", c.nextCSeq(), url, nil)
if err != nil {
return nil, err
}
return c.Do(req)
},
expected: []byte{
0x4f, 0x50, 0x54, 0x49, 0x4f, 0x4e, 0x53, 0x20, 0x72, 0x74, 0x73, 0x70, 0x3a, 0x2f, 0x2f, 0x61, // |OPTIONS rtsp://a|
0x64, 0x6d, 0x69, 0x6e, 0x3a, 0x61, 0x64, 0x6d, 0x69, 0x6e, 0x40, 0x31, 0x39, 0x32, 0x2e, 0x31, // |dmin:admin@192.1|
0x36, 0x38, 0x2e, 0x30, 0x2e, 0x35, 0x30, 0x3a, 0x38, 0x35, 0x35, 0x34, 0x2f, 0x43, 0x48, 0x30, // |68.0.50:8554/CH0|
0x30, 0x31, 0x2e, 0x73, 0x64, 0x70, 0x20, 0x52, 0x54, 0x53, 0x50, 0x2f, 0x31, 0x2e, 0x30, 0x0d, // |01.sdp RTSP/1.0.|
0x0a, 0x43, 0x53, 0x65, 0x71, 0x3a, 0x20, 0x31, 0x0d, 0x0a, 0x0d, 0x0a, /* */ // |.CSeq: 1....|
},
},
{
method: func(c *Client) (*Response, error) {
u, err := url.Parse(dummyURL + "/track1")
if err != nil {
return nil, err
}
req, err := NewRequest("SETUP", c.nextCSeq(), u, nil)
if err != nil {
return nil, err
}
req.Header.Add("Transport", fmt.Sprintf("RTP/AVP;unicast;client_port=%d-%d", 6870, 6871))
return c.Do(req)
},
expected: []byte{
0x53, 0x45, 0x54, 0x55, 0x50, 0x20, 0x72, 0x74, 0x73, 0x70, 0x3a, 0x2f, 0x2f, 0x61, 0x64, 0x6d, // |SETUP rtsp://adm|
0x69, 0x6e, 0x3a, 0x61, 0x64, 0x6d, 0x69, 0x6e, 0x40, 0x31, 0x39, 0x32, 0x2e, 0x31, 0x36, 0x38, // |in:admin@192.168|
0x2e, 0x30, 0x2e, 0x35, 0x30, 0x3a, 0x38, 0x35, 0x35, 0x34, 0x2f, 0x43, 0x48, 0x30, 0x30, 0x31, // |.0.50:8554/CH001|
0x2e, 0x73, 0x64, 0x70, 0x2f, 0x74, 0x72, 0x61, 0x63, 0x6b, 0x31, 0x20, 0x52, 0x54, 0x53, 0x50, // |.sdp/track1 RTSP|
0x2f, 0x31, 0x2e, 0x30, 0x0d, 0x0a, 0x54, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x3a, // |/1.0..Transport:|
0x20, 0x52, 0x54, 0x50, 0x2f, 0x41, 0x56, 0x50, 0x3b, 0x75, 0x6e, 0x69, 0x63, 0x61, 0x73, 0x74, // | RTP/AVP;unicast|
0x3b, 0x63, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x5f, 0x70, 0x6f, 0x72, 0x74, 0x3d, 0x36, 0x38, 0x37, // |;client_port=687|
0x30, 0x2d, 0x36, 0x38, 0x37, 0x31, 0x0d, 0x0a, 0x43, 0x53, 0x65, 0x71, 0x3a, 0x20, 0x33, 0x0d, // |0-6871..CSeq: 3.|
0x0a, 0x0d, 0x0a, /* */ // |...|
},
},
{
method: func(c *Client) (*Response, error) {
req, err := NewRequest("PLAY", c.nextCSeq(), url, nil)
if err != nil {
return nil, err
}
req.Header.Add("Session", "00000021")
return c.Do(req)
},
expected: []byte{
0x50, 0x4c, 0x41, 0x59, 0x20, 0x72, 0x74, 0x73, 0x70, 0x3a, 0x2f, 0x2f, 0x61, 0x64, 0x6d, 0x69, // |PLAY rtsp://admi|
0x6e, 0x3a, 0x61, 0x64, 0x6d, 0x69, 0x6e, 0x40, 0x31, 0x39, 0x32, 0x2e, 0x31, 0x36, 0x38, 0x2e, // |n:admin@192.168.|
0x30, 0x2e, 0x35, 0x30, 0x3a, 0x38, 0x35, 0x35, 0x34, 0x2f, 0x43, 0x48, 0x30, 0x30, 0x31, 0x2e, // |0.50:8554/CH001.|
0x73, 0x64, 0x70, 0x20, 0x52, 0x54, 0x53, 0x50, 0x2f, 0x31, 0x2e, 0x30, 0x0d, 0x0a, 0x43, 0x53, // |sdp RTSP/1.0..CS|
0x65, 0x71, 0x3a, 0x20, 0x34, 0x0d, 0x0a, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x3a, 0x20, // |eq: 4..Session: |
0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x32, 0x31, 0x0d, 0x0a, 0x0d, 0x0a, /* */ // |00000021....|
},
},
}
const serverAddr = "rtsp://localhost:8005"
const retries = 10
clientErr := make(chan error)
serverErr := make(chan error)
done := make(chan struct{})
// This routine acts as the server.
go func() {
l, err := net.Listen("tcp", strings.TrimLeft(serverAddr, "rtsp://"))
if err != nil {
serverErr <- errors.New(fmt.Sprintf("server could not listen, error: %v", err))
}
conn, err := l.Accept()
if err != nil {
serverErr <- errors.New(fmt.Sprintf("server could not accept connection, error: %v", err))
}
buf := make([]byte, maxRequest)
var n int
for i, test := range tests {
loop:
for {
n, err = conn.Read(buf)
err, ok := err.(net.Error)
switch {
case err == nil:
break loop
case err == io.EOF:
case ok && err.Timeout():
default:
serverErr <- errors.New(fmt.Sprintf("server could not read conn, error: %v", err))
return
}
}
// Write a dummy response, client won't care.
conn.Write([]byte{'\n'})
want := test.expected
got := buf[:n]
if !equal(got, want) {
serverErr <- errors.New(fmt.Sprintf("unexpected result for test: %v. \nGot: %v\n Want: %v\n", i, got, want))
}
}
close(done)
}()
// This routine acts as the client.
go func() {
var clt *Client
var err error
// Keep trying to connect to server.
// TODO: use generalised retry utility when available.
for retry := 0; ; retry++ {
clt, _, _, err = NewClient(serverAddr)
if err == nil {
break
}
if retry > retries {
clientErr <- errors.New(fmt.Sprintf("client could not connect to server, error: %v", err))
}
time.Sleep(10 * time.Millisecond)
}
for i, test := range tests {
_, err = test.method(clt)
if err != nil && err != io.EOF && err != errInvalidResponse {
clientErr <- errors.New(fmt.Sprintf("error request for: %v err: %v", i, err))
}
}
}()
// We check for errors or a done signal from the server and client routines.
for {
select {
case err := <-clientErr:
t.Fatalf("client error: %v", err)
case err := <-serverErr:
t.Fatalf("server error: %v", err)
case <-done:
return
default:
}
}
}
// equal checks that the got slice is considered equivalent to the want slice,
// neglecting unimportant differences such as order of items in header and the
// CSeq number.
func equal(got, want []byte) bool {
const eol = "\r\n"
gotParts := strings.Split(strings.TrimRight(string(got), eol), eol)
wantParts := strings.Split(strings.TrimRight(string(want), eol), eol)
gotParts, ok := rmSeqNum(gotParts)
if !ok {
return false
}
wantParts, ok = rmSeqNum(wantParts)
if !ok {
return false
}
for _, gotStr := range gotParts {
for i, wantStr := range wantParts {
if gotStr == wantStr {
wantParts = append(wantParts[:i], wantParts[i+1:]...)
}
}
}
return len(wantParts) == 0
}
// rmSeqNum removes the CSeq number from a string in []string that contains it.
// If a CSeq field is not found nil and false is returned.
func rmSeqNum(s []string) ([]string, bool) {
for i, _s := range s {
if strings.Contains(_s, "CSeq") {
s[i] = strings.TrimFunc(s[i], func(r rune) bool { return unicode.IsNumber(r) })
return s, true
}
}
return nil, false
}
// TestReadResponse checks that ReadResponse behaves as expected.
func TestReadResponse(t *testing.T) {
// input has been obtained from a valid RTSP response.
input := []byte{
0x52, 0x54, 0x53, 0x50, 0x2f, 0x31, 0x2e, 0x30, 0x20, 0x32, 0x30, 0x30, 0x20, 0x4f, 0x4b, 0x0d, // |RTSP/1.0 200 OK.|
0x0a, 0x43, 0x53, 0x65, 0x71, 0x3a, 0x20, 0x32, 0x0d, 0x0a, 0x44, 0x61, 0x74, 0x65, 0x3a, 0x20, // |.CSeq: 2..Date: |
0x57, 0x65, 0x64, 0x2c, 0x20, 0x4a, 0x61, 0x6e, 0x20, 0x32, 0x31, 0x20, 0x31, 0x39, 0x37, 0x30, // |Wed, Jan 21 1970|
0x20, 0x30, 0x32, 0x3a, 0x33, 0x37, 0x3a, 0x31, 0x34, 0x20, 0x47, 0x4d, 0x54, 0x0d, 0x0a, 0x50, // | 02:37:14 GMT..P|
0x75, 0x62, 0x6c, 0x69, 0x63, 0x3a, 0x20, 0x4f, 0x50, 0x54, 0x49, 0x4f, 0x4e, 0x53, 0x2c, 0x20, // |ublic: OPTIONS, |
0x44, 0x45, 0x53, 0x43, 0x52, 0x49, 0x42, 0x45, 0x2c, 0x20, 0x53, 0x45, 0x54, 0x55, 0x50, 0x2c, // |DESCRIBE, SETUP,|
0x20, 0x54, 0x45, 0x41, 0x52, 0x44, 0x4f, 0x57, 0x4e, 0x2c, 0x20, 0x50, 0x4c, 0x41, 0x59, 0x2c, // | TEARDOWN, PLAY,|
0x20, 0x47, 0x45, 0x54, 0x5f, 0x50, 0x41, 0x52, 0x41, 0x4d, 0x45, 0x54, 0x45, 0x52, 0x2c, 0x20, // | GET_PARAMETER, |
0x53, 0x45, 0x54, 0x5f, 0x50, 0x41, 0x52, 0x41, 0x4d, 0x45, 0x54, 0x45, 0x52, 0x0d, 0x0a, 0x0d, // |SET_PARAMETER...|
0x0a,
}
expect := Response{
Proto: "RTSP",
ProtoMajor: 1,
ProtoMinor: 0,
StatusCode: 200,
ContentLength: 0,
Header: map[string][]string{
"Cseq": []string{"2"},
"Date": []string{"Wed, Jan 21 1970 02:37:14 GMT"},
"Public": []string{"OPTIONS, DESCRIBE, SETUP, TEARDOWN, PLAY, GET_PARAMETER, SET_PARAMETER"},
},
}
got, err := ReadResponse(bytes.NewReader(input))
if err != nil {
t.Fatalf("should not have got error: %v", err)
}
if !respEqual(*got, expect) {
t.Errorf("did not get expected result.\nGot: %+v\n Want: %+v\n", got, expect)
}
}
// respEqual checks the equality of two Responses.
func respEqual(got, want Response) bool {
for _, f := range [][2]interface{}{
{got.Proto, want.Proto},
{got.ProtoMajor, want.ProtoMajor},
{got.ProtoMinor, want.ProtoMinor},
{got.StatusCode, want.StatusCode},
{got.ContentLength, want.ContentLength},
} {
if f[0] != f[1] {
return false
}
}
if len(got.Header) != len(want.Header) {
return false
}
for k, v := range got.Header {
if len(v) != len(want.Header[k]) {
return false
}
for i, _v := range v {
if _v != want.Header[k][i] {
return false
}
}
}
return true
}

4
revid/config.go
View File

@ -45,6 +45,7 @@ type Config struct {
Packetization uint8 Packetization uint8
Quantize bool // Determines whether input to revid will have constant or variable bitrate. Quantize bool // Determines whether input to revid will have constant or variable bitrate.
RtmpUrl string RtmpUrl string
RTSPURL string
Bitrate uint Bitrate uint
OutputPath string OutputPath string
InputPath string InputPath string
@ -137,6 +138,7 @@ const (
Udp Udp
MpegtsRtp MpegtsRtp
Rtp Rtp
RTSP
) )
// Default config settings // Default config settings
@ -186,7 +188,7 @@ func (c *Config) Validate(r *Revid) error {
} }
switch c.Input { switch c.Input {
case Raspivid, V4L, File, Audio: case Raspivid, V4L, File, Audio, RTSP:
case NothingDefined: case NothingDefined:
c.Logger.Log(logger.Info, pkg+"no input type defined, defaulting", "input", defaultInput) c.Logger.Log(logger.Info, pkg+"no input type defined, defaulting", "input", defaultInput)
c.Input = defaultInput c.Input = defaultInput

150
revid/revid.go
View File

@ -32,6 +32,7 @@ import (
"errors" "errors"
"fmt" "fmt"
"io" "io"
"net"
"os" "os"
"os/exec" "os/exec"
"strconv" "strconv"
@ -39,9 +40,14 @@ import (
"sync" "sync"
"time" "time"
"bitbucket.org/ausocean/av/codec/lex" "bitbucket.org/ausocean/av/codec/codecutil"
"bitbucket.org/ausocean/av/codec/h264"
"bitbucket.org/ausocean/av/codec/h265"
"bitbucket.org/ausocean/av/container/flv" "bitbucket.org/ausocean/av/container/flv"
"bitbucket.org/ausocean/av/container/mts" "bitbucket.org/ausocean/av/container/mts"
"bitbucket.org/ausocean/av/protocol/rtcp"
"bitbucket.org/ausocean/av/protocol/rtp"
"bitbucket.org/ausocean/av/protocol/rtsp"
"bitbucket.org/ausocean/iot/pi/netsender" "bitbucket.org/ausocean/iot/pi/netsender"
"bitbucket.org/ausocean/utils/ioext" "bitbucket.org/ausocean/utils/ioext"
"bitbucket.org/ausocean/utils/logger" "bitbucket.org/ausocean/utils/logger"
@ -59,6 +65,12 @@ const (
rtmpConnectionTimeout = 10 rtmpConnectionTimeout = 10
) )
const (
rtpPort = 60000
rtcpPort = 60001
defaultServerRTCPPort = 17301
)
const pkg = "revid:" const pkg = "revid:"
type Logger interface { type Logger interface {
@ -161,8 +173,17 @@ func (r *Revid) reset(config Config) error {
r.config.Logger.SetLevel(config.LogLevel) r.config.Logger.SetLevel(config.LogLevel)
err = r.setupPipeline( err = r.setupPipeline(
func(dst io.WriteCloser, fps float64, medType int) (io.WriteCloser, error) { func(dst io.WriteCloser, fps int, medType int) (io.WriteCloser, error) {
e := mts.NewEncoder(dst, fps, medType) var st int
switch r.config.Input {
case Raspivid, File, V4L:
st = mts.EncodeH264
case RTSP:
st = mts.EncodeH265
case Audio:
st = mts.EncodeAudio
}
e := mts.NewEncoder(dst, float64(fps), st)
return e, nil return e, nil
}, },
func(dst io.WriteCloser, fps int) (io.WriteCloser, error) { func(dst io.WriteCloser, fps int) (io.WriteCloser, error) {
@ -267,28 +288,21 @@ func (r *Revid) setupPipeline(mtsEnc func(dst io.WriteCloser, rate float64, medi
switch r.config.Input { switch r.config.Input {
case Raspivid: case Raspivid:
r.setupInput = r.startRaspivid r.setupInput = r.startRaspivid
r.lexTo = h264.Lex
case V4L: case V4L:
r.setupInput = r.startV4L r.setupInput = r.startV4L
r.lexTo = h264.Lex
case File: case File:
r.setupInput = r.setupInputForFile r.setupInput = r.setupInputForFile
r.lexTo = h264.Lex
case RTSP:
r.setupInput = r.startRTSPCamera
r.lexTo = h265.NewLexer(false).Lex
case Audio: case Audio:
r.setupInput = r.startAudioDevice r.setupInput = r.startAudioDevice
r.lexTo = codecutil.LexBytes
} }
switch r.config.InputCodec {
case H264:
r.config.Logger.Log(logger.Info, pkg+"using H264 lexer")
r.lexTo = lex.H264
case Mjpeg:
r.config.Logger.Log(logger.Info, pkg+"using MJPEG lexer")
r.lexTo = lex.MJPEG
case PCM:
r.config.Logger.Log(logger.Info, pkg+"using PCM lexer")
r.lexTo = lex.PCM
case ADPCM:
r.config.Logger.Log(logger.Info, pkg+"using ADPCM lexer")
r.lexTo = lex.ADPCM
}
return nil return nil
} }
@ -647,6 +661,108 @@ func (r *Revid) startAudioDevice() (func() error, error) {
}, nil }, nil
} }
// startRTSPCamera uses RTSP to request an RTP stream from an IP camera. An RTP
// client is created from which RTP packets containing either h264/h265 can read
// by the selected lexer.
func (r *Revid) startRTSPCamera() (func() error, error) {
rtspClt, local, remote, err := rtsp.NewClient(r.config.RTSPURL)
if err != nil {
return nil, err
}
resp, err := rtspClt.Options()
if err != nil {
return nil, err
}
r.config.Logger.Log(logger.Info, pkg+"RTSP OPTIONS response", "response", resp.String())
resp, err = rtspClt.Describe()
if err != nil {
return nil, err
}
r.config.Logger.Log(logger.Info, pkg+"RTSP DESCRIBE response", "response", resp.String())
resp, err = rtspClt.Setup("track1", fmt.Sprintf("RTP/AVP;unicast;client_port=%d-%d", rtpPort, rtcpPort))
if err != nil {
return nil, err
}
r.config.Logger.Log(logger.Info, pkg+"RTSP SETUP response", "response", resp.String())
rtpCltAddr, rtcpCltAddr, rtcpSvrAddr, err := formAddrs(local, remote, *resp)
if err != nil {
return nil, err
}
resp, err = rtspClt.Play()
if err != nil {
return nil, err
}
r.config.Logger.Log(logger.Info, pkg+"RTSP server PLAY response", "response", resp.String())
rtpClt, err := rtp.NewClient(rtpCltAddr)
if err != nil {
return nil, err
}
rtcpClt, err := rtcp.NewClient(rtcpCltAddr, rtcpSvrAddr, rtpClt, r.config.Logger.Log)
if err != nil {
return nil, err
}
// Check errors from RTCP client until it has stopped running.
go func() {
for {
err, ok := <-rtcpClt.Err()
if ok {
r.config.Logger.Log(logger.Warning, pkg+"RTCP error", "error", err.Error())
} else {
return
}
}
}()
// Start the RTCP client.
rtcpClt.Start()
// Start reading data from the RTP client.
r.wg.Add(1)
go r.processFrom(rtpClt, time.Second/time.Duration(r.config.FrameRate))
return func() error {
rtspClt.Close()
rtcpClt.Stop()
return nil
}, nil
}
// formAddrs is a helper function to form the addresses for the RTP client,
// RTCP client, and the RTSP server's RTCP addr using the local, remote addresses
// of the RTSP conn, and the SETUP method response.
func formAddrs(local, remote *net.TCPAddr, setupResp rtsp.Response) (rtpCltAddr, rtcpCltAddr, rtcpSvrAddr string, err error) {
svrRTCPPort, err := parseSvrRTCPPort(setupResp)
if err != nil {
return "", "", "", err
}
rtpCltAddr = strings.Split(local.String(), ":")[0] + ":" + strconv.Itoa(rtpPort)
rtcpCltAddr = strings.Split(local.String(), ":")[0] + ":" + strconv.Itoa(rtcpPort)
rtcpSvrAddr = strings.Split(remote.String(), ":")[0] + ":" + strconv.Itoa(svrRTCPPort)
return
}
// parseServerRTCPPort is a helper function to get the RTSP server's RTCP port.
func parseSvrRTCPPort(resp rtsp.Response) (int, error) {
transport := resp.Header.Get("Transport")
for _, p := range strings.Split(transport, ";") {
if strings.Contains(p, "server_port") {
port, err := strconv.Atoi(strings.Split(p, "-")[1])
if err != nil {
return 0, err
}
return port, nil
}
}
return 0, errors.New("SETUP response did not provide RTCP port")
}
func (r *Revid) processFrom(read io.Reader, delay time.Duration, bufSize int) { func (r *Revid) processFrom(read io.Reader, delay time.Duration, bufSize int) {
r.config.Logger.Log(logger.Info, pkg+"reading input data") r.config.Logger.Log(logger.Info, pkg+"reading input data")
r.err <- r.lexTo(r.encoders, read, delay, bufSize) r.err <- r.lexTo(r.encoders, read, delay, bufSize)

6
revid/senders_test.go
View File

@ -134,7 +134,7 @@ func TestMtsSenderSegment(t *testing.T) {
const numberOfClips = 11 const numberOfClips = 11
dst := &destination{t: t, done: make(chan struct{}), doneAt: numberOfClips} dst := &destination{t: t, done: make(chan struct{}), doneAt: numberOfClips}
sender := newMtsSender(dst, (*dummyLogger)(t).log, rbSize, rbElementSize, 0) sender := newMtsSender(dst, (*dummyLogger)(t).log, rbSize, rbElementSize, 0)
encoder := mts.NewEncoder(sender, 25, mts.Video) encoder := mts.NewEncoder(sender, 25, mts.EncodeH264)
// Turn time based PSI writing off for encoder. // Turn time based PSI writing off for encoder.
const psiSendCount = 10 const psiSendCount = 10
@ -212,7 +212,7 @@ func TestMtsSenderFailedSend(t *testing.T) {
const clipToFailAt = 3 const clipToFailAt = 3
dst := &destination{t: t, testFails: true, failAt: clipToFailAt, done: make(chan struct{})} dst := &destination{t: t, testFails: true, failAt: clipToFailAt, done: make(chan struct{})}
sender := newMtsSender(dst, (*dummyLogger)(t).log, rbSize, rbElementSize, 0) sender := newMtsSender(dst, (*dummyLogger)(t).log, rbSize, rbElementSize, 0)
encoder := mts.NewEncoder(sender, 25, mts.Video) encoder := mts.NewEncoder(sender, 25, mts.EncodeH264)
// Turn time based PSI writing off for encoder and send PSI every 10 packets. // Turn time based PSI writing off for encoder and send PSI every 10 packets.
const psiSendCount = 10 const psiSendCount = 10
@ -292,7 +292,7 @@ func TestMtsSenderDiscontinuity(t *testing.T) {
const clipToDelay = 3 const clipToDelay = 3
dst := &destination{t: t, sendDelay: 10 * time.Millisecond, delayAt: clipToDelay, done: make(chan struct{})} dst := &destination{t: t, sendDelay: 10 * time.Millisecond, delayAt: clipToDelay, done: make(chan struct{})}
sender := newMtsSender(dst, (*dummyLogger)(t).log, 1, rbElementSize, 0) sender := newMtsSender(dst, (*dummyLogger)(t).log, 1, rbElementSize, 0)
encoder := mts.NewEncoder(sender, 25, mts.Video) encoder := mts.NewEncoder(sender, 25, mts.EncodeH264)
// Turn time based PSI writing off for encoder. // Turn time based PSI writing off for encoder.
const psiSendCount = 10 const psiSendCount = 10