org.tritonus.share.sampled.TConversionTool Maven / Gradle / Ivy
/*
* TConversionTool.java
*
* This file is part of Tritonus: http://www.tritonus.org/
*/
/*
* Copyright (c) 1999,2000 by Florian Bomers
* Copyright (c) 2000 by Matthias Pfisterer
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
|<--- this code is formatted to fit into 80 columns --->|
*/
package org.tritonus.share.sampled;
/**
* Useful methods for converting audio data.
*
* @author Florian Bomers
* @author Matthias Pfisterer
*/
/*
For convenience, a list of available methods is maintained here.
Some hints:
- buffers: always byte arrays
- offsets: always in bytes
- sampleCount: number of SAMPLES to read/write, as opposed to FRAMES or BYTES!
- when in buffer and out buffer are given, the data is copied,
otherwise it is replaced in the same buffer (buffer size is not checked!)
- a number (except "2") gives the number of bits in which format
the samples have to be.
- >8 bits per sample is always treated signed.
- all functions are tried to be optimized - hints welcome !
** "high level" methods **
changeOrderOrSign(buffer, nOffset, nByteLength, nBytesPerSample)
changeOrderOrSign(inBuffer, nInOffset, outBuffer, nOutOffset, nByteLength, nBytesPerSample)
** PCM byte order and sign conversion **
void convertSign8(buffer, byteOffset, sampleCount)
void swapOrder16(buffer, byteOffset, sampleCount)
void swapOrder24(buffer, byteOffset, sampleCount)
void swapOrder32(buffer, byteOffset, sampleCount)
void convertSign8(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount)
void swapOrder16(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount)
void swapOrder24(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount)
void swapOrder32(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount)
** conversion functions for byte arrays **
** these are for reference to see how to implement these conversions **
short bytesToShort16(highByte, lowByte)
short bytesToShort16(buffer, byteOffset, bigEndian)
short bytesToInt16(highByte, lowByte)
short bytesToInt16(buffer, byteOffset, bigEndian)
short bytesToInt24(buffer, byteOffset, bigEndian)
short bytesToInt32(buffer, byteOffset, bigEndian)
void shortToBytes16(sample, buffer, byteOffset, bigEndian)
void intToBytes24(sample, buffer, byteOffset, bigEndian)
void intToBytes32(sample, buffer, byteOffset, bigEndian)
** ULAW <-> PCM **
byte linear2ulaw(int sample)
short ulaw2linear(int ulawbyte)
void pcm162ulaw(buffer, byteOffset, sampleCount, bigEndian)
void pcm162ulaw(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount, bigEndian)
void pcm82ulaw(buffer, byteOffset, sampleCount, signed)
void pcm82ulaw(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount, signed)
void ulaw2pcm16(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount, bigEndian)
void ulaw2pcm8(buffer, byteOffset, sampleCount, signed)
void ulaw2pcm8(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount, signed)
** ALAW <-> PCM **
byte linear2alaw(short pcm_val)
short alaw2linear(byte ulawbyte)
void pcm162alaw(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount, bigEndian)
void pcm162alaw(buffer, byteOffset, sampleCount, bigEndian)
void pcm82alaw(buffer, byteOffset, sampleCount, signed)
void pcm82alaw(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount, signed)
void alaw2pcm16(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount, bigEndian)
void alaw2pcm8(buffer, byteOffset, sampleCount, signed)
void alaw2pcm8(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount, signed)
** ULAW <-> ALAW **
byte ulaw2alaw(byte sample)
void ulaw2alaw(buffer, byteOffset, sampleCount)
void ulaw2alaw(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount)
byte alaw2ulaw(byte sample)
void alaw2ulaw(buffer, byteOffset, sampleCount)
void alaw2ulaw(inBuffer, inByteOffset, outBuffer, outByteOffset, sampleCount)
*/
public class TConversionTool {
///////////////// sign/byte-order conversion ///////////////////////////////////
public static void convertSign8(byte[] buffer, int byteOffset, int sampleCount) {
sampleCount+=byteOffset;
for (int i=byteOffset; i0) {
outBuffer[outByteOffset++]=(byte)(inBuffer[inByteOffset++]+128);
sampleCount--;
}
}
public static void swapOrder16(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset, int sampleCount) {
while (sampleCount>0) {
outBuffer[outByteOffset++]=inBuffer[inByteOffset+1];
outBuffer[outByteOffset++]=inBuffer[inByteOffset++];
inByteOffset++;
sampleCount--;
}
}
public static void swapOrder24(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset, int sampleCount) {
while (sampleCount>0) {
outBuffer[outByteOffset++]=inBuffer[inByteOffset+2];
outByteOffset++;
outBuffer[outByteOffset++]=inBuffer[inByteOffset++];
inByteOffset++;
inByteOffset++;
sampleCount--;
}
}
public static void swapOrder32(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset, int sampleCount) {
while (sampleCount>0) {
outBuffer[outByteOffset++]=inBuffer[inByteOffset+3];
outBuffer[outByteOffset++]=inBuffer[inByteOffset+2];
outBuffer[outByteOffset++]=inBuffer[inByteOffset+1];
outBuffer[outByteOffset++]=inBuffer[inByteOffset++];
inByteOffset++;
inByteOffset++;
inByteOffset++;
sampleCount--;
}
}
///////////////// conversion functions for byte arrays ////////////////////////////
/**
* Converts 2 bytes to a signed sample of type short.
* This is a reference function.
*/
public static short bytesToShort16(byte highByte, byte lowByte) {
return (short) ((highByte<<8) | (lowByte & 0xFF));
}
/**
* Converts 2 successive bytes starting at byteOffset in
* buffer to a signed sample of type short.
*
* For little endian, buffer[byteOffset] is interpreted as low byte,
* whereas it is interpreted as high byte in big endian.
*
This is a reference function.
*/
public static short bytesToShort16(byte[] buffer, int byteOffset, boolean bigEndian) {
return bigEndian?
((short) ((buffer[byteOffset]<<8) | (buffer[byteOffset+1] & 0xFF))):
((short) ((buffer[byteOffset+1]<<8) | (buffer[byteOffset] & 0xFF)));
}
/**
* Converts 2 bytes to a signed integer sample with 16bit range.
*
This is a reference function.
*/
public static int bytesToInt16(byte highByte, byte lowByte) {
return (highByte<<8) | (lowByte & 0xFF);
}
/**
* Converts 2 successive bytes starting at byteOffset in
* buffer to a signed integer sample with 16bit range.
*
* For little endian, buffer[byteOffset] is interpreted as low byte,
* whereas it is interpreted as high byte in big endian.
*
This is a reference function.
*/
public static int bytesToInt16(byte[] buffer, int byteOffset, boolean bigEndian) {
return bigEndian?
((buffer[byteOffset]<<8) | (buffer[byteOffset+1] & 0xFF)):
((buffer[byteOffset+1]<<8) | (buffer[byteOffset] & 0xFF));
}
/**
* Converts 3 successive bytes starting at byteOffset in
* buffer to a signed integer sample with 24bit range.
*
* For little endian, buffer[byteOffset] is interpreted as lowest byte,
* whereas it is interpreted as highest byte in big endian.
*
This is a reference function.
*/
public static int bytesToInt24(byte[] buffer, int byteOffset, boolean bigEndian) {
return bigEndian?
((buffer[byteOffset]<<16) // let Java handle sign-bit
| ((buffer[byteOffset+1] & 0xFF)<<8) // inhibit sign-bit handling
| (buffer[byteOffset+2] & 0xFF)):
((buffer[byteOffset+2]<<16) // let Java handle sign-bit
| ((buffer[byteOffset+1] & 0xFF)<<8) // inhibit sign-bit handling
| (buffer[byteOffset] & 0xFF));
}
/**
* Converts a 4 successive bytes starting at byteOffset in
* buffer to a signed 32bit integer sample.
*
* For little endian, buffer[byteOffset] is interpreted as lowest byte,
* whereas it is interpreted as highest byte in big endian.
*
This is a reference function.
*/
public static int bytesToInt32(byte[] buffer, int byteOffset, boolean bigEndian) {
return bigEndian?
((buffer[byteOffset]<<24) // let Java handle sign-bit
| ((buffer[byteOffset+1] & 0xFF)<<16) // inhibit sign-bit handling
| ((buffer[byteOffset+2] & 0xFF)<<8) // inhibit sign-bit handling
| (buffer[byteOffset+3] & 0xFF)):
((buffer[byteOffset+3]<<24) // let Java handle sign-bit
| ((buffer[byteOffset+2] & 0xFF)<<16) // inhibit sign-bit handling
| ((buffer[byteOffset+1] & 0xFF)<<8) // inhibit sign-bit handling
| (buffer[byteOffset] & 0xFF));
}
/**
* Converts a sample of type short to 2 bytes in an array.
* sample is interpreted as signed (as Java does).
*
* For little endian, buffer[byteOffset] is filled with low byte of sample,
* and buffer[byteOffset+1] is filled with high byte of sample.
*
For big endian, this is reversed.
*
This is a reference function.
*/
public static void shortToBytes16(short sample, byte[] buffer, int byteOffset, boolean bigEndian) {
intToBytes16(sample, buffer, byteOffset, bigEndian);
}
/**
* Converts a 16 bit sample of type int to 2 bytes in an array.
* sample is interpreted as signed (as Java does).
*
* For little endian, buffer[byteOffset] is filled with low byte of sample,
* and buffer[byteOffset+1] is filled with high byte of sample + sign bit.
*
For big endian, this is reversed.
*
Before calling this function, it should be assured that sample
* is in the 16bit range - it will not be clipped.
*
This is a reference function.
*/
public static void intToBytes16(int sample, byte[] buffer, int byteOffset, boolean bigEndian) {
if (bigEndian) {
buffer[byteOffset++]=(byte) (sample >> 8);
buffer[byteOffset]=(byte) (sample & 0xFF);
} else {
buffer[byteOffset++]=(byte) (sample & 0xFF);
buffer[byteOffset]=(byte) (sample >> 8);
}
}
/**
* Converts a 24 bit sample of type int to 3 bytes in an array.
* sample is interpreted as signed (as Java does).
*
* For little endian, buffer[byteOffset] is filled with low byte of sample,
* and buffer[byteOffset+2] is filled with the high byte of sample + sign bit.
*
For big endian, this is reversed.
*
Before calling this function, it should be assured that sample
* is in the 24bit range - it will not be clipped.
*
This is a reference function.
*/
public static void intToBytes24(int sample, byte[] buffer, int byteOffset, boolean bigEndian) {
if (bigEndian) {
buffer[byteOffset++]=(byte) (sample >> 16);
buffer[byteOffset++]=(byte) ((sample >>> 8) & 0xFF);
buffer[byteOffset]=(byte) (sample & 0xFF);
} else {
buffer[byteOffset++]=(byte) (sample & 0xFF);
buffer[byteOffset++]=(byte) ((sample >>> 8) & 0xFF);
buffer[byteOffset]=(byte) (sample >> 16);
}
}
/**
* Converts a 32 bit sample of type int to 4 bytes in an array.
* sample is interpreted as signed (as Java does).
*
* For little endian, buffer[byteOffset] is filled with lowest byte of sample,
* and buffer[byteOffset+3] is filled with the high byte of sample + sign bit.
*
For big endian, this is reversed.
*
This is a reference function.
*/
public static void intToBytes32(int sample, byte[] buffer, int byteOffset, boolean bigEndian) {
if (bigEndian) {
buffer[byteOffset++]=(byte) (sample >> 24);
buffer[byteOffset++]=(byte) ((sample >>> 16) & 0xFF);
buffer[byteOffset++]=(byte) ((sample >>> 8) & 0xFF);
buffer[byteOffset]=(byte) (sample & 0xFF);
} else {
buffer[byteOffset++]=(byte) (sample & 0xFF);
buffer[byteOffset++]=(byte) ((sample >>> 8) & 0xFF);
buffer[byteOffset++]=(byte) ((sample >>> 16) & 0xFF);
buffer[byteOffset]=(byte) (sample >> 24);
}
}
/////////////////////// ULAW ///////////////////////////////////////////
private static final boolean ZEROTRAP=true;
private static final short BIAS=0x84;
private static final int CLIP=32635;
private static final int exp_lut1[] ={
0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,
4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
};
/**
* Converts a linear signed 16bit sample to a uLaw byte.
* Ported to Java by fb.
*
Originally by:
* Craig Reese: IDA/Supercomputing Research Center
* Joe Campbell: Department of Defense
* 29 September 1989
*/
public static byte linear2ulaw(int sample) {
int sign, exponent, mantissa, ulawbyte;
if (sample>32767) sample=32767;
else if (sample<-32768) sample=-32768;
/* Get the sample into sign-magnitude. */
sign = (sample >> 8) & 0x80; /* set aside the sign */
if (sign != 0) sample = -sample; /* get magnitude */
if (sample > CLIP) sample = CLIP; /* clip the magnitude */
/* Convert from 16 bit linear to ulaw. */
sample = sample + BIAS;
exponent = exp_lut1[(sample >> 7) & 0xFF];
mantissa = (sample >> (exponent + 3)) & 0x0F;
ulawbyte = ~(sign | (exponent << 4) | mantissa);
if (ZEROTRAP)
if (ulawbyte == 0) ulawbyte = 0x02; /* optional CCITT trap */
return((byte) ulawbyte);
}
/* u-law to linear conversion table */
private static short[] u2l = {
-32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956,
-23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764,
-15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412,
-11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316,
-7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
-5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
-3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
-2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
-1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
-1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
-876, -844, -812, -780, -748, -716, -684, -652,
-620, -588, -556, -524, -492, -460, -428, -396,
-372, -356, -340, -324, -308, -292, -276, -260,
-244, -228, -212, -196, -180, -164, -148, -132,
-120, -112, -104, -96, -88, -80, -72, -64,
-56, -48, -40, -32, -24, -16, -8, 0,
32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
876, 844, 812, 780, 748, 716, 684, 652,
620, 588, 556, 524, 492, 460, 428, 396,
372, 356, 340, 324, 308, 292, 276, 260,
244, 228, 212, 196, 180, 164, 148, 132,
120, 112, 104, 96, 88, 80, 72, 64,
56, 48, 40, 32, 24, 16, 8, 0
};
public static short ulaw2linear(byte ulawbyte) {
return u2l[ulawbyte & 0xFF];
}
/**
* Converts a buffer of signed 16bit big endian samples to uLaw.
* The uLaw bytes overwrite the original 16 bit values.
* The first byte-offset of the uLaw bytes is byteOffset.
* It will be written sampleCount/2 bytes.
*/
public static void pcm162ulaw(byte[] buffer, int byteOffset, int sampleCount, boolean bigEndian) {
int shortIndex=byteOffset;
int ulawIndex=shortIndex;
if (bigEndian) {
while (sampleCount>0) {
buffer[ulawIndex++]=linear2ulaw
(bytesToInt16(buffer[shortIndex], buffer[shortIndex+1]));
shortIndex++;
shortIndex++;
sampleCount--;
}
} else {
while (sampleCount>0) {
buffer[ulawIndex++]=linear2ulaw
(bytesToInt16(buffer[shortIndex+1], buffer[shortIndex]));
shortIndex++;
shortIndex++;
sampleCount--;
}
}
}
/**
* Fills outBuffer with ulaw samples.
* reading starts from inBuffer[inByteOffset].
* writing starts at outBuffer[outByteOffset].
* There will be sampleCount*2 bytes read from inBuffer;
* There will be sampleCount bytes written to outBuffer.
*/
public static void pcm162ulaw(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset,
int sampleCount, boolean bigEndian) {
int shortIndex=inByteOffset;
int ulawIndex=outByteOffset;
if (bigEndian) {
while (sampleCount>0) {
outBuffer[ulawIndex++]=linear2ulaw
(bytesToInt16(inBuffer[shortIndex], inBuffer[shortIndex+1]));
shortIndex++;
shortIndex++;
sampleCount--;
}
} else {
while (sampleCount>0) {
outBuffer[ulawIndex++]=linear2ulaw
(bytesToInt16(inBuffer[shortIndex+1], inBuffer[shortIndex]));
shortIndex++;
shortIndex++;
sampleCount--;
}
}
}
// TODO: either direct 8bit pcm to ulaw, or better conversion from 8bit to 16bit
/**
* Converts a buffer of 8bit samples to uLaw.
* The uLaw bytes overwrite the original 8 bit values.
* The first byte-offset of the uLaw bytes is byteOffset.
* It will be written sampleCount bytes.
*/
public static void pcm82ulaw(byte[] buffer, int byteOffset, int sampleCount, boolean signed) {
sampleCount+=byteOffset;
if (signed) {
for (int i=byteOffset; ibytes written to outBuffer.
*/
public static void pcm82ulaw(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset, int sampleCount, boolean signed) {
int ulawIndex=outByteOffset;
int pcmIndex=inByteOffset;
if (signed) {
while (sampleCount>0) {
outBuffer[ulawIndex++]=linear2ulaw(inBuffer[pcmIndex++] << 8);
sampleCount--;
}
} else {
while (sampleCount>0) {
outBuffer[ulawIndex++]=linear2ulaw(((byte) (inBuffer[pcmIndex++]+128)) << 8);
sampleCount--;
}
}
}
/**
* Fills outBuffer with pcm signed 16 bit samples.
* reading starts from inBuffer[inByteOffset].
* writing starts at outBuffer[outByteOffset].
* There will be sampleCount bytes read from inBuffer;
* There will be sampleCount*2 bytes written to outBuffer.
*/
public static void ulaw2pcm16(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset,
int sampleCount, boolean bigEndian) {
int shortIndex=outByteOffset;
int ulawIndex=inByteOffset;
while (sampleCount>0) {
intToBytes16
(u2l[inBuffer[ulawIndex++] & 0xFF], outBuffer, shortIndex++, bigEndian);
shortIndex++;
sampleCount--;
}
}
// TODO: either direct 8bit pcm to ulaw, or better conversion from 8bit to 16bit
/**
* Inplace-conversion of a ulaw buffer to 8bit samples.
* The 8bit bytes overwrite the original ulaw values.
* The first byte-offset of the uLaw bytes is byteOffset.
* It will be written sampleCount bytes.
*/
public static void ulaw2pcm8(byte[] buffer, int byteOffset, int sampleCount, boolean signed) {
sampleCount+=byteOffset;
if (signed) {
for (int i=byteOffset; i> 8) & 0xFF);
}
} else {
for (int i=byteOffset; i>8)+128);
}
}
}
/**
* Fills outBuffer with ulaw samples.
* reading starts from inBuffer[inByteOffset].
* writing starts at outBuffer[outByteOffset].
* There will be sampleCount bytes written to outBuffer.
*/
public static void ulaw2pcm8(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset, int sampleCount, boolean signed) {
int ulawIndex=inByteOffset;
int pcmIndex=outByteOffset;
if (signed) {
while (sampleCount>0) {
outBuffer[pcmIndex++]=
(byte) ((u2l[inBuffer[ulawIndex++] & 0xFF] >> 8) & 0xFF);
sampleCount--;
}
} else {
while (sampleCount>0) {
outBuffer[pcmIndex++]=
(byte) ((u2l[inBuffer[ulawIndex++] & 0xFF]>>8)+128);
sampleCount--;
}
}
}
//////////////////// ALAW ////////////////////////////
/*
* 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.
*
* linear2alaw() - Convert a 16-bit linear PCM value to 8-bit A-law
*
* linear2alaw() accepts an 16-bit integer and encodes it as A-law data.
*
* Linear Input Code Compressed Code
* ------------------------ ---------------
* 0000000wxyza 000wxyz
* 0000001wxyza 001wxyz
* 000001wxyzab 010wxyz
* 00001wxyzabc 011wxyz
* 0001wxyzabcd 100wxyz
* 001wxyzabcde 101wxyz
* 01wxyzabcdef 110wxyz
* 1wxyzabcdefg 111wxyz
*
* For further information see John C. Bellamy's Digital Telephony, 1982,
* John Wiley & Sons, pps 98-111 and 472-476.
*/
private static final byte QUANT_MASK = 0xf; /* Quantization field mask. */
private static final byte SEG_SHIFT = 4; /* Left shift for segment number. */
private static final short[] seg_end = {
0xFF, 0x1FF, 0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF
};
public static byte linear2alaw(short pcm_val) /* 2's complement (16-bit range) */
{
byte mask;
byte seg=8;
byte aval;
if (pcm_val >= 0) {
mask = (byte) 0xD5; /* sign (7th) bit = 1 */
} else {
mask = 0x55; /* sign bit = 0 */
pcm_val = (short) (-pcm_val - 8);
}
/* Convert the scaled magnitude to segment number. */
for (int i = 0; i < 8; i++) {
if (pcm_val <= seg_end[i]) {
seg=(byte) i;
break;
}
}
/* Combine the sign, segment, and quantization bits. */
if (seg >= 8) /* out of range, return maximum value. */
return (byte) ((0x7F ^ mask) & 0xFF);
else {
aval = (byte) (seg << SEG_SHIFT);
if (seg < 2)
aval |= (pcm_val >> 4) & QUANT_MASK;
else
aval |= (pcm_val >> (seg + 3)) & QUANT_MASK;
return (byte) ((aval ^ mask) & 0xFF);
}
}
private static short[] a2l = {
-5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736,
-7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784,
-2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368,
-3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392,
-22016, -20992, -24064, -23040, -17920, -16896, -19968, -18944,
-30208, -29184, -32256, -31232, -26112, -25088, -28160, -27136,
-11008, -10496, -12032, -11520, -8960, -8448, -9984, -9472,
-15104, -14592, -16128, -15616, -13056, -12544, -14080, -13568,
-344, -328, -376, -360, -280, -264, -312, -296,
-472, -456, -504, -488, -408, -392, -440, -424,
-88, -72, -120, -104, -24, -8, -56, -40,
-216, -200, -248, -232, -152, -136, -184, -168,
-1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184,
-1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696,
-688, -656, -752, -720, -560, -528, -624, -592,
-944, -912, -1008, -976, -816, -784, -880, -848,
5504, 5248, 6016, 5760, 4480, 4224, 4992, 4736,
7552, 7296, 8064, 7808, 6528, 6272, 7040, 6784,
2752, 2624, 3008, 2880, 2240, 2112, 2496, 2368,
3776, 3648, 4032, 3904, 3264, 3136, 3520, 3392,
22016, 20992, 24064, 23040, 17920, 16896, 19968, 18944,
30208, 29184, 32256, 31232, 26112, 25088, 28160, 27136,
11008, 10496, 12032, 11520, 8960, 8448, 9984, 9472,
15104, 14592, 16128, 15616, 13056, 12544, 14080, 13568,
344, 328, 376, 360, 280, 264, 312, 296,
472, 456, 504, 488, 408, 392, 440, 424,
88, 72, 120, 104, 24, 8, 56, 40,
216, 200, 248, 232, 152, 136, 184, 168,
1376, 1312, 1504, 1440, 1120, 1056, 1248, 1184,
1888, 1824, 2016, 1952, 1632, 1568, 1760, 1696,
688, 656, 752, 720, 560, 528, 624, 592,
944, 912, 1008, 976, 816, 784, 880, 848
};
public static short alaw2linear(byte ulawbyte) {
return a2l[ulawbyte & 0xFF];
}
/**
* Converts a buffer of signed 16bit big endian samples to uLaw.
* The uLaw bytes overwrite the original 16 bit values.
* The first byte-offset of the uLaw bytes is byteOffset.
* It will be written sampleCount/2 bytes.
*/
public static void pcm162alaw(byte[] buffer, int byteOffset, int sampleCount, boolean bigEndian) {
int shortIndex=byteOffset;
int alawIndex=shortIndex;
if (bigEndian) {
while (sampleCount>0) {
buffer[alawIndex++]=
linear2alaw(bytesToShort16
(buffer[shortIndex], buffer[shortIndex+1]));
shortIndex++;
shortIndex++;
sampleCount--;
}
} else {
while (sampleCount>0) {
buffer[alawIndex++]=
linear2alaw(bytesToShort16
(buffer[shortIndex+1], buffer[shortIndex]));
shortIndex++;
shortIndex++;
sampleCount--;
}
}
}
/**
* Fills outBuffer with alaw samples.
* reading starts from inBuffer[inByteOffset].
* writing starts at outBuffer[outByteOffset].
* There will be sampleCount*2 bytes read from inBuffer;
* There will be sampleCount bytes written to outBuffer.
*/
public static void pcm162alaw(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset, int sampleCount, boolean bigEndian) {
int shortIndex=inByteOffset;
int alawIndex=outByteOffset;
if (bigEndian) {
while (sampleCount>0) {
outBuffer[alawIndex++]=linear2alaw
(bytesToShort16(inBuffer[shortIndex], inBuffer[shortIndex+1]));
shortIndex++;
shortIndex++;
sampleCount--;
}
} else {
while (sampleCount>0) {
outBuffer[alawIndex++]=linear2alaw
(bytesToShort16(inBuffer[shortIndex+1], inBuffer[shortIndex]));
shortIndex++;
shortIndex++;
sampleCount--;
}
}
}
/**
* Converts a buffer of 8bit samples to alaw.
* The alaw bytes overwrite the original 8 bit values.
* The first byte-offset of the aLaw bytes is byteOffset.
* It will be written sampleCount bytes.
*/
public static void pcm82alaw(byte[] buffer, int byteOffset, int sampleCount, boolean signed) {
sampleCount+=byteOffset;
if (signed) {
for (int i=byteOffset; ibytes written to outBuffer.
*/
public static void pcm82alaw(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset, int sampleCount, boolean signed) {
int alawIndex=outByteOffset;
int pcmIndex=inByteOffset;
if (signed) {
while (sampleCount>0) {
outBuffer[alawIndex++]=
linear2alaw((short) (inBuffer[pcmIndex++] << 8));
sampleCount--;
}
} else {
while (sampleCount>0) {
outBuffer[alawIndex++]=
linear2alaw((short) (((byte) (inBuffer[pcmIndex++]+128)) << 8));
sampleCount--;
}
}
}
/**
* Converts an alaw buffer to 8bit pcm samples
* The 8bit bytes overwrite the original alaw values.
* The first byte-offset of the aLaw bytes is byteOffset.
* It will be written sampleCount bytes.
*/
public static void alaw2pcm8(byte[] buffer, int byteOffset, int sampleCount, boolean signed) {
sampleCount+=byteOffset;
if (signed) {
for (int i=byteOffset; i> 8) & 0xFF);
}
} else {
for (int i=byteOffset; i>8)+128);
}
}
}
/**
* Fills outBuffer with alaw samples.
* reading starts from inBuffer[inByteOffset].
* writing starts at outBuffer[outByteOffset].
* There will be sampleCount bytes written to outBuffer.
*/
public static void alaw2pcm8(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset, int sampleCount, boolean signed) {
int alawIndex=inByteOffset;
int pcmIndex=outByteOffset;
if (signed) {
while (sampleCount>0) {
outBuffer[pcmIndex++]=
(byte) ((a2l[inBuffer[alawIndex++] & 0xFF] >> 8) & 0xFF);
sampleCount--;
}
} else {
while (sampleCount>0) {
outBuffer[pcmIndex++]=
(byte) ((a2l[inBuffer[alawIndex++] & 0xFF]>>8)+128);
sampleCount--;
}
}
}
/**
* Fills outBuffer with pcm signed 16 bit samples.
* reading starts from inBuffer[inByteOffset].
* writing starts at outBuffer[outByteOffset].
* There will be sampleCount bytes read from inBuffer;
* There will be sampleCount*2 bytes written to outBuffer.
*/
public static void alaw2pcm16(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset,
int sampleCount, boolean bigEndian) {
int shortIndex=outByteOffset;
int alawIndex=inByteOffset;
while (sampleCount>0) {
intToBytes16
(a2l[inBuffer[alawIndex++] & 0xFF], outBuffer, shortIndex++, bigEndian);
shortIndex++;
sampleCount--;
}
}
//////////////////////// cross conversion alaw <-> ulaw ////////////////////////////////////////
private static byte[] u2a = {
-86, -85, -88, -87, -82, -81, -84, -83, -94, -93, -96, -95, -90, -89, -92, -91,
-70, -69, -72, -71, -66, -65, -68, -67, -78, -77, -80, -79, -74, -73, -76, -75,
-118, -117, -120, -119, -114, -113, -116, -115, -126, -125, -128, -127, -122, -121, -124, -123,
-101, -104, -103, -98, -97, -100, -99, -110, -109, -112, -111, -106, -105, -108, -107, -22,
-24, -23, -18, -17, -20, -19, -30, -29, -32, -31, -26, -25, -28, -27, -6, -8,
-2, -1, -4, -3, -14, -13, -16, -15, -10, -9, -12, -11, -53, -55, -49, -51,
-62, -61, -64, -63, -58, -57, -60, -59, -38, -37, -40, -39, -34, -33, -36, -35,
-46, -46, -45, -45, -48, -48, -47, -47, -42, -42, -41, -41, -44, -44, -43, -43,
42, 43, 40, 41, 46, 47, 44, 45, 34, 35, 32, 33, 38, 39, 36, 37,
58, 59, 56, 57, 62, 63, 60, 61, 50, 51, 48, 49, 54, 55, 52, 53,
10, 11, 8, 9, 14, 15, 12, 13, 2, 3, 0, 1, 6, 7, 4, 5,
27, 24, 25, 30, 31, 28, 29, 18, 19, 16, 17, 22, 23, 20, 21, 106,
104, 105, 110, 111, 108, 109, 98, 99, 96, 97, 102, 103, 100, 101, 122, 120,
126, 127, 124, 125, 114, 115, 112, 113, 118, 119, 116, 117, 75, 73, 79, 77,
66, 67, 64, 65, 70, 71, 68, 69, 90, 91, 88, 89, 94, 95, 92, 93,
82, 82, 83, 83, 80, 80, 81, 81, 86, 86, 87, 87, 84, 84, 85, 85,
};
public static byte ulaw2alaw(byte sample) {
return u2a[sample & 0xFF];
}
/**
* Converts a buffer of uLaw samples to aLaw.
*/
public static void ulaw2alaw(byte[] buffer, int byteOffset, int sampleCount) {
sampleCount+=byteOffset;
for (int i=byteOffset; i0) {
outBuffer[alawIndex++]=u2a[inBuffer[ulawIndex++] & 0xFF];
sampleCount--;
}
}
private static byte[] a2u = {
-86, -85, -88, -87, -82, -81, -84, -83, -94, -93, -96, -95, -90, -89, -92, -91,
-71, -70, -73, -72, -67, -66, -69, -68, -79, -78, -80, -80, -75, -74, -77, -76,
-118, -117, -120, -119, -114, -113, -116, -115, -126, -125, -128, -127, -122, -121, -124, -123,
-102, -101, -104, -103, -98, -97, -100, -99, -110, -109, -112, -111, -106, -105, -108, -107,
-30, -29, -32, -31, -26, -25, -28, -27, -35, -35, -36, -36, -33, -33, -34, -34,
-12, -10, -16, -14, -4, -2, -8, -6, -22, -21, -24, -23, -18, -17, -20, -19,
-56, -55, -58, -57, -52, -51, -54, -53, -64, -63, -65, -65, -60, -59, -62, -61,
-42, -41, -44, -43, -38, -37, -40, -39, -49, -49, -50, -50, -46, -45, -48, -47,
42, 43, 40, 41, 46, 47, 44, 45, 34, 35, 32, 33, 38, 39, 36, 37,
57, 58, 55, 56, 61, 62, 59, 60, 49, 50, 48, 48, 53, 54, 51, 52,
10, 11, 8, 9, 14, 15, 12, 13, 2, 3, 0, 1, 6, 7, 4, 5,
26, 27, 24, 25, 30, 31, 28, 29, 18, 19, 16, 17, 22, 23, 20, 21,
98, 99, 96, 97, 102, 103, 100, 101, 93, 93, 92, 92, 95, 95, 94, 94,
116, 118, 112, 114, 124, 126, 120, 122, 106, 107, 104, 105, 110, 111, 108, 109,
72, 73, 70, 71, 76, 77, 74, 75, 64, 65, 63, 63, 68, 69, 66, 67,
86, 87, 84, 85, 90, 91, 88, 89, 79, 79, 78, 78, 82, 83, 80, 81,
};
public static byte alaw2ulaw(byte sample) {
return a2u[sample & 0xFF];
}
/**
* Converts a buffer of aLaw samples to uLaw.
* The uLaw bytes overwrite the original aLaw values.
* The first byte-offset of the uLaw bytes is byteOffset.
* It will be written sampleCount bytes.
*/
public static void alaw2ulaw(byte[] buffer, int byteOffset, int sampleCount) {
sampleCount+=byteOffset;
for (int i=byteOffset; ibytes written to outBuffer.
*/
public static void alaw2ulaw(byte[] inBuffer, int inByteOffset,
byte[] outBuffer, int outByteOffset, int sampleCount) {
int ulawIndex=outByteOffset;
int alawIndex=inByteOffset;
while (sampleCount>0) {
outBuffer[ulawIndex++]=a2u[inBuffer[alawIndex++] & 0xFF];
sampleCount--;
}
}
//////////////////////// high level methods /////////////////////////////////////////////////
/*
* !! Here, unlike other functions in this class, the length is
* in bytes rather than samples !!
*/
public static void changeOrderOrSign(byte[] buffer, int nOffset,
int nByteLength, int nBytesPerSample) {
switch (nBytesPerSample) {
case 1:
convertSign8(buffer, nOffset, nByteLength);
break;
case 2:
swapOrder16(buffer, nOffset, nByteLength / 2);
break;
case 3:
swapOrder24(buffer, nOffset, nByteLength / 3);
break;
case 4:
swapOrder32(buffer, nOffset, nByteLength / 4);
break;
}
}
/*
* !! Here, unlike other functions in this class, the length is
* in bytes rather than samples !!
*/
public static void changeOrderOrSign(
byte[] inBuffer, int nInOffset,
byte[] outBuffer, int nOutOffset,
int nByteLength, int nBytesPerSample) {
switch (nBytesPerSample) {
case 1:
convertSign8(
inBuffer, nInOffset,
outBuffer, nOutOffset,
nByteLength);
break;
case 2:
swapOrder16(
inBuffer, nInOffset,
outBuffer, nOutOffset,
nByteLength / 2);
break;
case 3:
swapOrder24(
inBuffer, nInOffset,
outBuffer, nOutOffset,
nByteLength / 3);
break;
case 4:
swapOrder32(
inBuffer, nInOffset,
outBuffer, nOutOffset,
nByteLength / 4);
break;
}
}
///////////////// Annexe: how the arrays were created. //////////////////////////////////
/*
* Converts a uLaw byte to a linear signed 16bit sample.
* Ported to Java by fb.
*
Originally by:
*
* Craig Reese: IDA/Supercomputing Research Center
* 29 September 1989
*
* References:
*
* - CCITT Recommendation G.711 (very difficult to follow)
* - MIL-STD-188-113,"Interoperability and Performance Standards
* for Analog-to_Digital Conversion Techniques,"
* 17 February 1987
*
*/
/*
private static final int exp_lut2[] = {
0,132,396,924,1980,4092,8316,16764
};
public static short _ulaw2linear(int ulawbyte) {
int sign, exponent, mantissa, sample;
ulawbyte = ~ulawbyte;
sign = (ulawbyte & 0x80);
exponent = (ulawbyte >> 4) & 0x07;
mantissa = ulawbyte & 0x0F;
sample = exp_lut2[exponent] + (mantissa << (exponent + 3));
if (sign != 0) sample = -sample;
return((short) sample);
}*/
/* u- to A-law conversions: copied from CCITT G.711 specifications */
/*
private static byte[] _u2a = {
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,
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, (byte) 128};
*/
/* u-law to A-law conversion */
/*
* 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.
*/
/*
public static byte _ulaw2alaw(byte sample) {
sample &= 0xff;
return (byte) (((sample & 0x80)!=0) ? (0xD5 ^ (_u2a[(0x7F ^ sample) & 0x7F] - 1)) :
(0x55 ^ (_u2a[(0x7F ^ sample) & 0x7F] - 1)));
}*/
/* A- to u-law conversions */
/*
private static byte[] _a2u = {
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,
73, 74, 75, 76, 77, 78, 79, 79,
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};
*/
/*
* 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.
*/
/*
public static byte _alaw2ulaw(byte sample) {
sample &= 0xff;
return (byte) (((sample & 0x80)!=0) ? (0xFF ^ _a2u[(sample ^ 0xD5) & 0x7F]) :
(0x7F ^ _a2u[(sample ^ 0x55) & 0x7F]));
}
public static void print_a2u() {
System.out.println("\tprivate static byte[] a2u = {");
for (int i=-128; i<128; i++) {
if (((i+128) % 16)==0) {
System.out.print("\t\t");
}
byte b=(byte) i;
System.out.print(_alaw2ulaw(b)+", ");
if (((i+128) % 16)==15) {
System.out.println("");
}
}
System.out.println("\t};");
}
public static void print_u2a() {
System.out.println("\tprivate static byte[] u2a = {");
for (int i=-128; i<128; i++) {
if (((i+128) % 16)==0) {
System.out.print("\t\t");
}
byte b=(byte) i;
System.out.print(_ulaw2alaw(b)+", ");
if (((i+128) % 16)==15) {
System.out.println("");
}
}
System.out.println("\t};");
}
*/
}
/*** TConversionTool.java ***/