G711UCodec.java
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package cn.org.hentai.jtt1078.codec;
import cn.org.hentai.jtt1078.util.ByteUtils;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
/*
* This source code is a product of Sun Microsystems, Inc. and is provided
* for unrestricted use. Users may copy or modify this source code without
* charge.
*
* SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING
* THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun source code is provided with no support and without any obligation on
* the part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
/**
* Created by houcheng on 2019-12-11.
*/
public class G711UCodec extends AudioCodec
{
static final int ULAW = 1;
static final int ALAW = 2;
/* 16384 entries per table (16 bit) */
static byte[] linear_to_ulaw = new byte[65536];
/* 16384 entries per table (8 bit) */
static short[] ulaw_to_linear = new short[256];
static final int SIGN_BIT = 0x80;
static final int QUANT_MASK = 0x0f;
static final int NSEGS = 0x08;
static final int SEG_SHIFT = 0x04;
static final int SEG_MASK = 0x70;
static final int BIAS = 0x84;
static final int CLIP = 8159;
static short[] seg_aend = { 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF, 0x7FF, 0xFFF };
static short[] seg_uend = { 0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF, 0x7FF, 0xFFF, 0x1FFF };
int[] _u2a = { /* u- to A-law conversions */
1, 1, 2, 2, 3, 3, 4, 4,
5, 5, 6, 6, 7, 7, 8, 8,
9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24,
25, 27, 29, 31, 33, 34, 35, 36,
37, 38, 39, 40, 41, 42, 43, 44,
46, 48, 49, 50, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, 62,
64, 65, 66, 67, 68, 69, 70, 71,
72, 73, 74, 75, 76, 77, 78, 79,
/* corrected:
81, 82, 83, 84, 85, 86, 87, 88,
should be: */
80, 82, 83, 84, 85, 86, 87, 88,
89, 90, 91, 92, 93, 94, 95, 96,
97, 98, 99, 100, 101, 102, 103, 104,
105, 106, 107, 108, 109, 110, 111, 112,
113, 114, 115, 116, 117, 118, 119, 120,
121, 122, 123, 124, 125, 126, 127, 128};
int[] _a2u = { /* A- to u-law conversions */
1, 3, 5, 7, 9, 11, 13, 15,
16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31,
32, 32, 33, 33, 34, 34, 35, 35,
36, 37, 38, 39, 40, 41, 42, 43,
44, 45, 46, 47, 48, 48, 49, 49,
50, 51, 52, 53, 54, 55, 56, 57,
58, 59, 60, 61, 62, 63, 64, 64,
65, 66, 67, 68, 69, 70, 71, 72,
/* corrected:
73, 74, 75, 76, 77, 78, 79, 79,
should be: */
73, 74, 75, 76, 77, 78, 79, 80,
80, 81, 82, 83, 84, 85, 86, 87,
88, 89, 90, 91, 92, 93, 94, 95,
96, 97, 98, 99, 100, 101, 102, 103,
104, 105, 106, 107, 108, 109, 110, 111,
112, 113, 114, 115, 116, 117, 118, 119,
120, 121, 122, 123, 124, 125, 126, 127};
static
{
// 初始化ulaw表
for (int i = 0; i < 256; i++) ulaw_to_linear[i] = ulaw2linear((byte)i);
// 初始化ulaw2linear表
for (int i = 0; i < 65535; i++) linear_to_ulaw[i] = linear2ulaw((short)i);
}
public static short ulaw2linear(byte u_val)
{
short t;
u_val = (byte)(~u_val);
t = (short)(((u_val & QUANT_MASK) << 3) + BIAS);
t <<= (u_val & SEG_MASK) >>> SEG_SHIFT;
return ((u_val & SIGN_BIT) > 0 ? (short)(BIAS - t) : (short)(t - BIAS));
}
public static byte linear2ulaw(short pcm_val)
{
short mask;
short seg;
byte uval;
pcm_val = (short)(pcm_val >> 2);
if (pcm_val < 0)
{
pcm_val = (short)(-pcm_val);
mask = 0x7f;
}
else
{
mask = 0xff;
}
if (pcm_val > CLIP) pcm_val = CLIP;
pcm_val += (BIAS >> 2);
seg = search(pcm_val, seg_uend, (short)8);
if (seg >= 8)
{
return (byte)(0x7f ^ mask);
}
else
{
uval = (byte) ((seg << 4) | ((pcm_val >> (seg + 1)) & 0xF));
return (byte)(uval ^ mask);
}
}
static short search(short val, short[] table, short size)
{
for (short i = 0; i < size; i++)
{
if (val <= table[i]) return i;
}
return size;
}
static void ulaw_to_pcm16(int src_length, byte[] src_samples, byte[] dst_samples)
{
for (int i = 0, k = 0; i < src_length; i++)
{
short s = ulaw_to_linear[src_samples[i] & 0xff];
dst_samples[k++] = (byte)(s & 0xff);
dst_samples[k++] = (byte)((s >> 8) & 0xff);
}
}
static void pcm16_to_ulaw(int src_length, byte[] src_samples, byte[] dst_samples)
{
short[] s_samples = ByteUtils.toShortArray(src_samples);
for (int i = 0, k = 0; i < s_samples.length; i++)
{
dst_samples[k++] = linear2ulaw(s_samples[i]);
}
}
@Override
public byte[] toPCM(byte[] data)
{
byte[] temp;
// 如果前四字节是00 01 52 00，则是海思头，需要去掉
if (data[0] == 0x00 && data[1] == 0x01 && (data[2] & 0xff) == (data.length - 4) / 2 && data[3] == 0x00)
{
temp = new byte[data.length - 4];
System.arraycopy(data, 4, temp, 0, temp.length);
}
else temp = data;
byte[] dest = new byte[temp.length * 2];
ulaw_to_pcm16(temp.length, temp, dest);
return dest;
}
@Override
public byte[] fromPCM(byte[] data)
{
byte[] dest = new byte[data.length / 2];
pcm16_to_ulaw(data.length, data, dest);
return dest;
}
public static void main(String[] args) throws Exception
{
FileInputStream fis = new FileInputStream("d:\\fuck121212121.pcm");
int len = -1;
byte[] buff = new byte[320];
AudioCodec codec = new G711UCodec();
ByteArrayOutputStream baos = new ByteArrayOutputStream(4096 * 1024);
while ((len = fis.read(buff)) > -1)
{
baos.write(buff, 0, len);
}
new FileOutputStream("D:\\temp\\fuckfuckfuck.g711u").write(codec.fromPCM(baos.toByteArray()));
}
}