mirror of https://bitbucket.org/ausocean/av.git
Merged in audio-compression (pull request #142)
stream/adpcm & cmd/adpcm: Audio compression (ADPCM) Approved-by: kortschak <dan@kortschak.io>
This commit is contained in:
Trek Hopton
commit
adf58b800b
|
|
@ -5,6 +5,7 @@ av is a collection of tools and packages written in Go for audio-video processin
|
|||
# Authors
|
||||
Alan Noble
|
||||
Saxon A. Nelson-Milton <saxon.milton@gmail.com>
|
||||
Trek Hopton <trek@ausocean.org>
|
||||
|
||||
# Description
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,333 @@
|
|||
/*
|
||||
NAME
|
||||
adpcm.go
|
||||
|
||||
DESCRIPTION
|
||||
adpcm.go contains functions for encoding/compressing pcm into adpcm and decoding/decompressing back to pcm.
|
||||
|
||||
AUTHOR
|
||||
Trek Hopton <trek@ausocean.org>
|
||||
|
||||
LICENSE
|
||||
adpcm.go is Copyright (C) 2018 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 [GNU licenses](http://www.gnu.org/licenses).
|
||||
*/
|
||||
|
||||
/*
|
||||
Original IMA/DVI ADPCM specification: (http://www.cs.columbia.edu/~hgs/audio/dvi/IMA_ADPCM.pdf).
|
||||
Reference algorithms for ADPCM compression and decompression are in part 6.
|
||||
*/
|
||||
|
||||
package adpcm
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"encoding/binary"
|
||||
"fmt"
|
||||
)
|
||||
|
||||
// encoder is used to encode to ADPCM from PCM data.
|
||||
// pred and index hold state that persists between calls to encodeSample and calcHead.
|
||||
// dest is the output buffer that implements io.writer and io.bytewriter, ie. where the encoded ADPCM data is written to.
|
||||
type encoder struct {
|
||||
dest *bytes.Buffer
|
||||
pred int16
|
||||
index int16
|
||||
}
|
||||
|
||||
// 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
|
||||
}
|
||||
|
||||
// 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).
|
||||
var indexTable = []int16{
|
||||
-1, -1, -1, -1, 2, 4, 6, 8,
|
||||
-1, -1, -1, -1, 2, 4, 6, 8,
|
||||
}
|
||||
|
||||
// Quantize step size table (see spec).
|
||||
var stepTable = []int16{
|
||||
7, 8, 9, 10, 11, 12, 13, 14,
|
||||
16, 17, 19, 21, 23, 25, 28, 31,
|
||||
34, 37, 41, 45, 50, 55, 60, 66,
|
||||
73, 80, 88, 97, 107, 118, 130, 143,
|
||||
157, 173, 190, 209, 230, 253, 279, 307,
|
||||
337, 371, 408, 449, 494, 544, 598, 658,
|
||||
724, 796, 876, 963, 1060, 1166, 1282, 1411,
|
||||
1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024,
|
||||
3327, 3660, 4026, 4428, 4871, 5358, 5894, 6484,
|
||||
7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
|
||||
15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794,
|
||||
32767,
|
||||
}
|
||||
|
||||
// NewEncoder retuns a new ADPCM encoder.
|
||||
func NewEncoder(dst *bytes.Buffer) *encoder {
|
||||
e := encoder{
|
||||
dest: dst,
|
||||
}
|
||||
return &e
|
||||
}
|
||||
|
||||
// NewDecoder retuns a new ADPCM decoder.
|
||||
func NewDecoder(dst *bytes.Buffer) *decoder {
|
||||
d := decoder{
|
||||
step: stepTable[0],
|
||||
dest: dst,
|
||||
}
|
||||
return &d
|
||||
}
|
||||
|
||||
// encodeSample takes a single 16 bit PCM sample and
|
||||
// returns a byte of which the last 4 bits are an encoded ADPCM nibble.
|
||||
func (e *encoder) encodeSample(sample int16) byte {
|
||||
// Find difference of actual sample from encoder's prediction.
|
||||
delta := sample - e.pred
|
||||
|
||||
// Create and set sign bit for nibble and find absolute value of difference.
|
||||
var nib byte
|
||||
if delta < 0 {
|
||||
nib = 8
|
||||
delta = -delta
|
||||
}
|
||||
|
||||
step := stepTable[e.index]
|
||||
diff := step >> 3
|
||||
var mask byte = 4
|
||||
|
||||
for i := 0; i < 3; i++ {
|
||||
if delta > step {
|
||||
nib |= mask
|
||||
delta -= step
|
||||
diff += step
|
||||
}
|
||||
mask >>= 1
|
||||
step >>= 1
|
||||
}
|
||||
|
||||
// Adjust predicted sample based on calculated difference.
|
||||
if nib&8 != 0 {
|
||||
e.pred -= diff
|
||||
} else {
|
||||
e.pred += diff
|
||||
}
|
||||
|
||||
e.index += indexTable[nib&7]
|
||||
|
||||
// Check for underflow and overflow.
|
||||
if e.index < 0 {
|
||||
e.index = 0
|
||||
} else if e.index > int16(len(stepTable)-1) {
|
||||
e.index = int16(len(stepTable) - 1)
|
||||
}
|
||||
|
||||
return nib
|
||||
}
|
||||
|
||||
// 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.
|
||||
func (d *decoder) decodeSample(nibble byte) int16 {
|
||||
// Calculate difference.
|
||||
var diff int16
|
||||
if nibble&4 != 0 {
|
||||
diff += d.step
|
||||
}
|
||||
if nibble&2 != 0 {
|
||||
diff += d.step >> 1
|
||||
}
|
||||
if nibble&1 != 0 {
|
||||
diff += d.step >> 2
|
||||
}
|
||||
diff += d.step >> 3
|
||||
|
||||
// Account for sign bit.
|
||||
if nibble&8 != 0 {
|
||||
diff = -diff
|
||||
}
|
||||
|
||||
// Adjust predicted sample based on calculated difference.
|
||||
d.pred += diff
|
||||
|
||||
// Adjust index into step size lookup table using nibble.
|
||||
d.index += indexTable[nibble]
|
||||
|
||||
// Check for overflow and underflow.
|
||||
if d.index < 0 {
|
||||
d.index = 0
|
||||
} else if d.index > int16(len(stepTable)-1) {
|
||||
d.index = int16(len(stepTable) - 1)
|
||||
}
|
||||
|
||||
// Find new quantizer step size.
|
||||
d.step = stepTable[d.index]
|
||||
|
||||
return d.pred
|
||||
}
|
||||
|
||||
// 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 (dest).
|
||||
// It returns the number of bytes written to the encoder's io.Writer (dest) along with any errors.
|
||||
func (e *encoder) calcHead(sample []byte) (int, error) {
|
||||
// Check that we are given 1 16-bit sample (2 bytes).
|
||||
const sampSize = 2
|
||||
if len(sample) != sampSize {
|
||||
return 0, fmt.Errorf("length of given byte array is: %v, expected: %v", len(sample), sampSize)
|
||||
}
|
||||
|
||||
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 {
|
||||
return n, err
|
||||
}
|
||||
|
||||
// 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.
|
||||
for i := 4; i < AdpcmBS; i++ {
|
||||
twoNibs := block[i]
|
||||
nib2 := byte(twoNibs >> 4)
|
||||
nib1 := byte((nib2 << 4) ^ twoNibs)
|
||||
|
||||
firstBytes := make([]byte, 2)
|
||||
binary.LittleEndian.PutUint16(firstBytes, uint16(d.decodeSample(nib1)))
|
||||
_n, err := d.dest.Write(firstBytes)
|
||||
n += _n
|
||||
if err != nil {
|
||||
return n, err
|
||||
}
|
||||
|
||||
secondBytes := make([]byte, 2)
|
||||
binary.LittleEndian.PutUint16(secondBytes, uint16(d.decodeSample(nib2)))
|
||||
_n, err = d.dest.Write(secondBytes)
|
||||
n += _n
|
||||
if err != nil {
|
||||
return n, err
|
||||
}
|
||||
}
|
||||
|
||||
return n, nil
|
||||
}
|
||||
|
||||
// Write takes a slice of bytes of arbitrary length representing pcm and encodes in into adpcm.
|
||||
// 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
|
||||
if err != nil {
|
||||
return n, err
|
||||
}
|
||||
}
|
||||
|
||||
return n, nil
|
||||
}
|
||||
|
||||
// Write takes a slice of bytes of arbitrary length representing adpcm and decodes in into pcm.
|
||||
// It writes its output to the decoder's dest.
|
||||
// The number of bytes written out is returned along with any error that occured.
|
||||
func (d *decoder) Write(inAdpcm []byte) (int, error) {
|
||||
numBlocks := len(inAdpcm) / AdpcmBS
|
||||
n := 0
|
||||
for i := 0; i < numBlocks; i++ {
|
||||
block := inAdpcm[AdpcmBS*i : AdpcmBS*(i+1)]
|
||||
_n, err := d.decodeBlock(block)
|
||||
n += _n
|
||||
if err != nil {
|
||||
return n, err
|
||||
}
|
||||
}
|
||||
|
||||
return n, nil
|
||||
}
|
||||
|
|
@ -0,0 +1,92 @@
|
|||
/*
|
||||
NAME
|
||||
adpcm_test.go
|
||||
|
||||
DESCRIPTION
|
||||
adpcm_test.go contains tests for the adpcm package.
|
||||
|
||||
AUTHOR
|
||||
Trek Hopton <trek@ausocean.org>
|
||||
|
||||
LICENSE
|
||||
adpcm_test.go is Copyright (C) 2018 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 [GNU licenses](http://www.gnu.org/licenses).
|
||||
*/
|
||||
|
||||
package adpcm
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"io/ioutil"
|
||||
"testing"
|
||||
)
|
||||
|
||||
// TestEncodeBlock will read PCM data, encode it in blocks and generate ADPCM
|
||||
// then compare the result with expected ADPCM.
|
||||
func TestEncodeBlock(t *testing.T) {
|
||||
// Read input pcm.
|
||||
pcm, err := ioutil.ReadFile("../../../test/test-data/av/input/raw-voice.pcm")
|
||||
if err != nil {
|
||||
t.Errorf("Unable to read input PCM file: %v", err)
|
||||
}
|
||||
|
||||
// Encode adpcm.
|
||||
numBlocks := len(pcm) / PcmBS
|
||||
comp := bytes.NewBuffer(make([]byte, 0, AdpcmBS*numBlocks))
|
||||
enc := NewEncoder(comp)
|
||||
_, err = enc.Write(pcm)
|
||||
if err != nil {
|
||||
t.Errorf("Unable to write to encoder: %v", err)
|
||||
}
|
||||
|
||||
// Read expected adpcm file.
|
||||
exp, err := ioutil.ReadFile("../../../test/test-data/av/output/encoded-voice.adpcm")
|
||||
if err != nil {
|
||||
t.Errorf("Unable to read expected ADPCM file: %v", err)
|
||||
}
|
||||
|
||||
if !bytes.Equal(comp.Bytes(), exp) {
|
||||
t.Error("ADPCM generated does not match expected ADPCM")
|
||||
}
|
||||
}
|
||||
|
||||
// TestDecodeBlock will read encoded ADPCM, decode it in blocks and then compare the
|
||||
// resulting PCM with the expected decoded PCM.
|
||||
func TestDecodeBlock(t *testing.T) {
|
||||
// Read adpcm.
|
||||
comp, err := ioutil.ReadFile("../../../test/test-data/av/input/encoded-voice.adpcm")
|
||||
if err != nil {
|
||||
t.Errorf("Unable to read input ADPCM file: %v", err)
|
||||
}
|
||||
|
||||
// Decode adpcm.
|
||||
numBlocks := len(comp) / AdpcmBS
|
||||
decoded := bytes.NewBuffer(make([]byte, 0, PcmBS*numBlocks))
|
||||
dec := NewDecoder(decoded)
|
||||
_, err = dec.Write(comp)
|
||||
if err != nil {
|
||||
t.Errorf("Unable to write to decoder: %v", err)
|
||||
}
|
||||
|
||||
// Read expected pcm file.
|
||||
exp, err := ioutil.ReadFile("../../../test/test-data/av/output/decoded-voice.pcm")
|
||||
if err != nil {
|
||||
t.Errorf("Unable to read expected PCM file: %v", err)
|
||||
}
|
||||
|
||||
if !bytes.Equal(decoded.Bytes(), exp) {
|
||||
t.Error("PCM generated does not match expected PCM")
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,71 @@
|
|||
/*
|
||||
NAME
|
||||
decode-pcm.go
|
||||
|
||||
DESCRIPTION
|
||||
decode-pcm.go is a program for decoding/decompressing an adpcm file to a pcm file.
|
||||
|
||||
AUTHOR
|
||||
Trek Hopton <trek@ausocean.org>
|
||||
|
||||
LICENSE
|
||||
decode-pcm.go is Copyright (C) 2018 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 [GNU licenses](http://www.gnu.org/licenses).
|
||||
*/
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"flag"
|
||||
"fmt"
|
||||
"io/ioutil"
|
||||
"log"
|
||||
|
||||
"bitbucket.org/ausocean/av/audio/adpcm"
|
||||
)
|
||||
|
||||
// This program accepts an input file encoded in adpcm and outputs a decoded pcm file.
|
||||
// Input and output file names can be specified as arguments.
|
||||
func main() {
|
||||
var inPath string
|
||||
var outPath string
|
||||
flag.StringVar(&inPath, "in", "encoded.adpcm", "file path of input")
|
||||
flag.StringVar(&outPath, "out", "decoded.pcm", "file path of output data")
|
||||
flag.Parse()
|
||||
|
||||
// Read adpcm.
|
||||
comp, err := ioutil.ReadFile(inPath)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
fmt.Println("Read", len(comp), "bytes from file", inPath)
|
||||
|
||||
// Decode adpcm.
|
||||
numBlocks := len(comp) / adpcm.AdpcmBS
|
||||
decoded := bytes.NewBuffer(make([]byte, 0, adpcm.PcmBS*numBlocks))
|
||||
dec := adpcm.NewDecoder(decoded)
|
||||
_, err = dec.Write(comp)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
// Save pcm to file.
|
||||
err = ioutil.WriteFile(outPath, decoded.Bytes(), 0644)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
fmt.Println("Decoded and wrote", len(decoded.Bytes()), "bytes to file", outPath)
|
||||
}
|
||||
|
|
@ -0,0 +1,71 @@
|
|||
/*
|
||||
NAME
|
||||
encode-pcm.go
|
||||
|
||||
DESCRIPTION
|
||||
encode-pcm.go is a program for encoding/compressing a pcm file to an adpcm file.
|
||||
|
||||
AUTHOR
|
||||
Trek Hopton <trek@ausocean.org>
|
||||
|
||||
LICENSE
|
||||
encode-pcm.go is Copyright (C) 2018 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 [GNU licenses](http://www.gnu.org/licenses).
|
||||
*/
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"flag"
|
||||
"fmt"
|
||||
"io/ioutil"
|
||||
"log"
|
||||
|
||||
"bitbucket.org/ausocean/av/audio/adpcm"
|
||||
)
|
||||
|
||||
// This program accepts an input pcm file and outputs an encoded adpcm file.
|
||||
// Input and output file names can be specified as arguments.
|
||||
func main() {
|
||||
var inPath string
|
||||
var adpcmPath string
|
||||
flag.StringVar(&inPath, "in", "data.pcm", "file path of input data")
|
||||
flag.StringVar(&adpcmPath, "out", "encoded.adpcm", "file path of output")
|
||||
flag.Parse()
|
||||
|
||||
// Read pcm.
|
||||
pcm, err := ioutil.ReadFile(inPath)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
fmt.Println("Read", len(pcm), "bytes from file", inPath)
|
||||
|
||||
// Encode adpcm.
|
||||
numBlocks := len(pcm) / adpcm.PcmBS
|
||||
comp := bytes.NewBuffer(make([]byte, 0, adpcm.AdpcmBS*numBlocks))
|
||||
enc := adpcm.NewEncoder(comp)
|
||||
_, err = enc.Write(pcm)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
// Save adpcm to file.
|
||||
err = ioutil.WriteFile(adpcmPath, comp.Bytes(), 0644)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
fmt.Println("Encoded and wrote", len(comp.Bytes()), "bytes to file", adpcmPath)
|
||||
}
|
||||
Loading…
Reference in New Issue