ADPCMCodec.java
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package cn.org.hentai.jtt1078.codec;
import cn.org.hentai.jtt1078.server.Jtt1078Decoder;
import cn.org.hentai.jtt1078.util.ByteHolder;
import cn.org.hentai.jtt1078.util.Packet;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Arrays;
/**
* Created by houcheng on 2019-12-05.
* ADPCM 和 PCM转换
*/
public final class ADPCMCodec extends AudioCodec
{
static int[] indexTable = {
-1, -1, -1, -1, 2, 4, 6, 8,
-1, -1, -1, -1, 2, 4, 6, 8
};
static int[] stepsizeTable = {
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
};
public static class State
{
public short valprev;
public byte index;
}
public byte[] toPCM(byte[] data)
{
State state = new State();
int dlen = data.length / 2;
byte[] temp;
// 如果前四字节是00 01 52 00，则是海思头，需要去掉，否则就视为普通的ADPCM编码
if (data[0] == 0x00 && data[1] == 0x01 && (data[2] & 0xff) == (data.length - 4) / 2 && data[3] == 0x00)
{
dlen = (data.length - 8);
temp = new byte[data.length - 8];
System.arraycopy(data, 8, temp, 0, temp.length);
state.valprev = (short)(((data[5] << 8) & 0xff00) | (data[4] & 0xff));
state.index = data[6];
}
else
{
dlen = data.length - 4;
temp = new byte[data.length - 4];
System.arraycopy(data, 4, temp, 0, temp.length);
state.valprev = (short)(((data[1] << 8) & 0xff00) | (data[0] & 0xff));
state.index = data[2];
}
short[] outdata = new short[dlen * 2];
adpcm_decoder(temp, outdata, dlen * 2, state);
temp = new byte[dlen * 4];
for (int i = 0, k = 0; i < outdata.length; i++)
{
short s = outdata[i];
temp[k++] = (byte)(s & 0xff);
temp[k++] = (byte)((s >> 8) & 0xff);
}
return temp;
}
public byte[] fromPCM(byte[] data)
{
return null;
}
public static void adpcm_coder(short[] indata, byte[] outdata, int len, State state)
{
int val; /* Current input sample value */
int sign; /* Current adpcm sign bit */
int delta; /* Current adpcm output value */
int diff; /* Difference between val and valprev */
int step; /* Stepsize */
int valpred; /* Predicted output value */
int vpdiff; /* Current change to valpred */
int index; /* Current step change index */
int outputbuffer = 0; /* place to keep previous 4-bit value */
int bufferstep; /* toggle between outputbuffer/output */
byte[] outp = outdata;
short[] inp = indata;
valpred = state.valprev;
index = state.index;
step = stepsizeTable[index];
bufferstep = 1;
int k = 0;
for ( int i = 0; len > 0 ; len--, i++) {
val = inp[i];
/* Step 1 - compute difference with previous value */
diff = val - valpred;
sign = (diff < 0) ? 8 : 0;
if ( sign != 0) diff = (-diff);
/* Step 2 - Divide and clamp */
/* Note:
** This code *approximately* computes:
** delta = diff*4/step;
** vpdiff = (delta+0.5)*step/4;
** but in shift step bits are dropped. The net result of this is
** that even if you have fast mul/div hardware you cannot put it to
** good use since the fixup would be too expensive.
*/
delta = 0;
vpdiff = (step >> 3);
if ( diff >= step ) {
delta = 4;
diff -= step;
vpdiff += step;
}
step >>= 1;
if ( diff >= step ) {
delta |= 2;
diff -= step;
vpdiff += step;
}
step >>= 1;
if ( diff >= step ) {
delta |= 1;
vpdiff += step;
}
/* Step 3 - Update previous value */
if ( sign != 0 )
valpred -= vpdiff;
else
valpred += vpdiff;
/* Step 4 - Clamp previous value to 16 bits */
if ( valpred > 32767 )
valpred = 32767;
else if ( valpred < -32768 )
valpred = -32768;
/* Step 5 - Assemble value, update index and step values */
delta |= sign;
index += indexTable[delta];
if ( index < 0 ) index = 0;
if ( index > 88 ) index = 88;
step = stepsizeTable[index];
/* Step 6 - Output value */
if ( bufferstep != 0 ) {
outputbuffer = (delta << 4) & 0xf0;
} else {
outp[k++] = (byte)((delta & 0x0f) | outputbuffer);
}
bufferstep = bufferstep == 0 ? 1 : 0;
}
/* Output last step, if needed */
if ( bufferstep == 0 )
outp[k++] = (byte)outputbuffer;
state.valprev = (short)valpred;
state.index = (byte)index;
}
public static void adpcm_decoder(byte[] indata, short[] outdata, int len, State state)
{
// signed char *inp; /* Input buffer pointer */
// short *outp; /* output buffer pointer */
int sign; /* Current adpcm sign bit */
int delta; /* Current adpcm output value */
int step; /* Stepsize */
int valpred; /* Predicted value */
int vpdiff; /* Current change to valpred */
int index; /* Current step change index */
int inputbuffer = 0; /* place to keep next 4-bit value */
int bufferstep; /* toggle between inputbuffer/input */
short[] outp = outdata;
byte[] inp = indata;
valpred = state.valprev;
index = state.index;
if ( index < 0 ) index = 0;
if ( index > 88 ) index = 88;
step = stepsizeTable[index];
bufferstep = 0;
int k = 0;
for ( int i = 0; len > 0 ; len-- ) {
/* Step 1 - get the delta value */
if ( bufferstep != 0 ) {
delta = inputbuffer & 0xf;
} else {
inputbuffer = inp[i++];
delta = (inputbuffer >> 4) & 0xf;
}
bufferstep = bufferstep == 0 ? 1 : 0;
/* Step 2 - Find new index value (for later) */
index += indexTable[delta];
if ( index < 0 ) index = 0;
if ( index > 88 ) index = 88;
/* Step 3 - Separate sign and magnitude */
sign = delta & 8;
delta = delta & 7;
/* Step 4 - Compute difference and new predicted value */
/*
** Computes 'vpdiff = (delta+0.5)*step/4', but see comment
** in adpcm_coder.
*/
vpdiff = step >> 3;
if ( (delta & 4) > 0 ) vpdiff += step;
if ( (delta & 2) > 0 ) vpdiff += step>>1;
if ( (delta & 1) > 0 ) vpdiff += step>>2;
if ( sign != 0 )
valpred -= vpdiff;
else
valpred += vpdiff;
/* Step 5 - clamp output value */
if ( valpred > 32767 )
valpred = 32767;
else if ( valpred < -32768 )
valpred = -32768;
/* Step 6 - Update step value */
step = stepsizeTable[index];
/* Step 7 - Output value */
outp[k++] = (short)valpred;
}
state.valprev = (short)valpred;
state.index = (byte)index;
}
public static void main(String[] args) throws Exception
{
ByteArrayInputStream bais = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream(1024 * 1024 * 4);
int len = -1;
byte[] block = new byte[512];
FileInputStream fis = new FileInputStream("d:\\test\\g711\\streamax.bin");
FileOutputStream fos = new FileOutputStream("d:\\test\\g711\\111111111122222222222222.pcm");
ADPCMCodec codec = new ADPCMCodec();
Jtt1078Decoder decoder = new Jtt1078Decoder();
while ((len = fis.read(block)) > -1)
{
decoder.write(block, 0, len);
while (true)
{
Packet p = decoder.decode();
if (p == null) break;
int lengthOffset = 28;
int dataType = (p.seek(15).nextByte() >> 4) & 0x0f;
// 透传数据类型：0100，没有后面的时间以及Last I Frame Interval和Last Frame Interval字段
if (dataType == 0x04) lengthOffset = 28 - 8 - 2 - 2;
else if (dataType == 0x03) lengthOffset = 28 - 4;
// FFMpegManager.getInstance().feed(publisherId, packet.seek(lengthOffset + 2).nextBytes());
if (dataType == 0x00 || dataType == 0x01 || dataType == 0x02)
{
}
else
{
byte[] data = p.seek(lengthOffset + 2).nextBytes();
fos.write(codec.toPCM(data));
fos.flush();
}
}
}
fos.flush();
fis.close();
fos.close();
}
}