mirror of https://bitbucket.org/ausocean/av.git
300 lines
7.3 KiB
Go
300 lines
7.3 KiB
Go
/*
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NAME
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revid - a testbed for re-muxing and re-directing video streams as MPEG-TS over various protocols.
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DESCRIPTION
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See Readme.md
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AUTHORS
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Alan Noble <anoble@gmail.com>
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Saxon A. Nelson-Milton <saxon.milton@gmail.com>
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LICENSE
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revid is Copyright (C) 2017 Alan Noble.
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It is free software: you can redistribute it and/or modify them
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with revid in gpl.txt. If not, see [GNU licenses](http://www.gnu.org/licenses).
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*/
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// revid is a testbed for re-muxing and re-directing video streams as MPEG-TS over various protocols.
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package revid
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import (
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"bufio"
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"bytes"
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"crypto/md5"
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"encoding/hex"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"os"
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"os/exec"
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"strconv"
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"time"
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"bitbucket.org/ausocean/av/h264"
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"bitbucket.org/ausocean/av/tsgenerator"
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"bitbucket.org/ausocean/av/ringbuffer"
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)
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// defaults and networking consts
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const (
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clipDuration = 1 // s
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defaultPID = 256
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defaultFrameRate = 25
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mp2tPacketSize = 188 // MPEG-TS packet size
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mp2tMaxPackets = 2016 * clipDuration // # first multiple of 7 and 8 greater than 2000
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udpPackets = 7 // # of UDP packets per ethernet frame (8 is the max)
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rtpPackets = 7 // # of RTP packets per ethernet frame (7 is the max)
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rtpHeaderSize = 12
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rtpSSRC = 1 // any value will do
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bufferSize = 100 / clipDuration
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httpTimeOut = 5 // s
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motionThreshold = "0.0025"
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qscale = "3"
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defaultRaspividCmd = "raspivid -o -"
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framesPerSec = 25
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packetsPerFrame = 7
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h264BufferSize = 500000
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)
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const (
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Raspivid = 0
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Rtp = 1
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H264Codec = 2
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File = 4
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HttpOut = 5
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)
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var cmd *exec.Cmd
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var inputReader *bufio.Reader
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type Config struct {
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Input uint8
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InputCmd string
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Output uint8
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OutputFileName string
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InputFileName string
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Height string
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Width string
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Bitrate string
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FrameRate string
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HttpAddress string
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}
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type RevidInst interface {
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Start()
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Stop()
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ChangeState(newConfig Config) error
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}
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type revidInst struct {
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expectCC int
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dumpCC int
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dumpPCRBase uint64
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conn net.Conn
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ffmpegPath string
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tempDir string
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ringBuffer ringbuffer.RingBuffer
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config Config
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isRunning bool
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Error *log.Logger
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outputFile *os.File
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inputFile *os.File
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generator tsgenerator.TsGenerator
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h264Parser h264.H264Parser
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}
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func NewRevidInstance(config Config) (r *revidInst, err error) {
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r = new(revidInst)
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r.ringBuffer = ringbuffer.NewRingBuffer(bufferSize, mp2tPacketSize*mp2tMaxPackets)
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r.Error = log.New(os.Stderr, "ERROR: ", log.Ldate|log.Ltime|log.Lshortfile)
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r.expectCC = -1
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r.dumpCC = -1
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r.dumpPCRBase = 0
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r.ChangeState(config)
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switch r.config.Output {
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case File:
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r.outputFile, err = os.Create(r.config.OutputFileName)
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if err != nil {
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return nil, err
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}
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}
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switch r.config.Input {
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case File:
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r.inputFile, err = os.Open(r.config.InputFileName)
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if err != nil {
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return nil, err
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}
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}
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r.generator = tsgenerator.NewTsGenerator(framesPerSec)
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r.h264Parser = h264.H264Parser{OutputChan: r.generator.GetNalInputChan()}
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// TODO: Need to create constructor for parser otherwise I'm going to break
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// something eventuallyl
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go r.h264Parser.Parse()
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go r.input()
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return
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}
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func (r *revidInst) ChangeState(newConfig Config) error {
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// TODO: check that the config is G
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r.config = newConfig
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return nil
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}
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func (r *revidInst) Start() {
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r.isRunning = true
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go r.generator.Generate()
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switch r.config.Input {
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case Raspivid:
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cmd = exec.Command("raspivid", "-o", "-", "-n", "-t", "0", "-b",
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r.config.Bitrate, "-w", r.config.Width, "-h", r.config.Height, "-fps", r.config.FrameRate)
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stdout, _ := cmd.StdoutPipe()
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err := cmd.Start()
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inputReader = bufio.NewReader(stdout)
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if err != nil {
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r.Error.Println(err.Error())
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return
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}
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case File:
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default:
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r.Error.Println("Input not valid!")
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}
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var h264Data []byte
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switch r.config.Input {
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case Raspivid:
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go func() {
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for r.isRunning {
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h264Data = make([]byte, 1)
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_, err := io.ReadFull(inputReader, h264Data)
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if err != nil {
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if err.Error() == "EOF" {
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r.Error.Println("No data from camera!")
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time.Sleep(5*time.Second)
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} else {
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r.Error.Println(err.Error())
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}
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} else {
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r.h264Parser.InputByteChan <- h264Data[0]
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}
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}
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}()
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case File:
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stats, err := r.inputFile.Stat()
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if err != nil {
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panic("Could not get file stats!")
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}
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h264Data = make([]byte, stats.Size())
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_, err = r.inputFile.Read(h264Data)
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if err != nil {
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r.Error.Println(err.Error())
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}
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for i := range h264Data {
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r.h264Parser.InputByteChan <- h264Data[i]
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}
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}
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go r.output()
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}
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func (r *revidInst) Stop() {
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if r.isRunning {
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r.isRunning = false
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r.generator.Stop()
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cmd.Process.Kill()
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}
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}
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func (r *revidInst) input() {
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clipSize := 0
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packetCount := 0
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now := time.Now()
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prevTime := now
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fmt.Println("reading")
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for {
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if clip, err := r.ringBuffer.Get(); err != nil {
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r.Error.Println(err.Error())
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return
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} else {
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for {
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tsPacket := <-(r.generator.GetTsOutputChan())
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byteSlice, err := tsPacket.ToByteSlice()
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if err != nil {
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r.Error.Println(err.Error())
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}
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upperBound := clipSize + mp2tPacketSize
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copy(clip[clipSize:upperBound], byteSlice)
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packetCount++
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clipSize += mp2tPacketSize
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// send if (1) our buffer is full or (2) 1 second has elapsed and we have % packetsPerFrame
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now = time.Now()
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if (packetCount == mp2tMaxPackets) ||
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(now.Sub(prevTime) > clipDuration*time.Second && packetCount%packetsPerFrame == 0) {
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if err := r.ringBuffer.DoneWriting(clipSize); err != nil {
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r.Error.Println(err.Error())
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return
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}
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clipSize = 0
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packetCount = 0
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prevTime = now
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break
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}
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}
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}
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}
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}
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func (r *revidInst) output() {
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for r.isRunning {
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if clip, err := r.ringBuffer.Read(); err == nil {
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switch r.config.Output {
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case File:
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r.outputFile.Write(clip)
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case HttpOut:
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for err := sendClipToHTTP(clip, r.config.HttpAddress); err != nil; {
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err = sendClipToHTTP(clip, r.config.HttpAddress)
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}
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default:
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r.Error.Println("No output?")
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}
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if err := r.ringBuffer.DoneReading(); err != nil {
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r.Error.Println(err.Error())
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}
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}
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}
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}
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// sendClipToHTPP posts a video clip via HTTP, using a new TCP connection each time.
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func sendClipToHTTP(clip []byte, output string) error {
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timeout := time.Duration(httpTimeOut * time.Second)
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client := http.Client{
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Timeout: timeout,
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}
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hash := md5.Sum(clip)
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url := output + strconv.Itoa(len(clip)) + "." + hex.EncodeToString(hash[:]) // NB: append size.digest to output
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fmt.Printf("Posting %s (%d bytes)\n", url, len(clip))
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resp, err := client.Post(url, "video/mp2t", bytes.NewReader(clip)) // lighter than NewBuffer
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if err != nil {
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return fmt.Errorf("Error posting to %s: %s", output, err)
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err == nil {
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fmt.Printf("%s\n", body)
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}
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return nil
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}
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