Java example source code file (PCMtoPCMCodec.java)
The PCMtoPCMCodec.java Java example source code/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* questions.
*/
package com.sun.media.sound;
import java.io.IOException;
import java.util.Vector;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
/**
* Converts among signed/unsigned and little/big endianness of sampled.
*
* @author Jan Borgersen
*/
public final class PCMtoPCMCodec extends SunCodec {
private static final AudioFormat.Encoding[] inputEncodings = {
AudioFormat.Encoding.PCM_SIGNED,
AudioFormat.Encoding.PCM_UNSIGNED,
};
private static final AudioFormat.Encoding[] outputEncodings = {
AudioFormat.Encoding.PCM_SIGNED,
AudioFormat.Encoding.PCM_UNSIGNED,
};
private static final int tempBufferSize = 64;
private byte tempBuffer [] = null;
/**
* Constructs a new PCMtoPCM codec object.
*/
public PCMtoPCMCodec() {
super( inputEncodings, outputEncodings);
}
// NEW CODE
/**
*/
public AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat){
if( sourceFormat.getEncoding().equals( AudioFormat.Encoding.PCM_SIGNED ) ||
sourceFormat.getEncoding().equals( AudioFormat.Encoding.PCM_UNSIGNED ) ) {
AudioFormat.Encoding encs[] = new AudioFormat.Encoding[2];
encs[0] = AudioFormat.Encoding.PCM_SIGNED;
encs[1] = AudioFormat.Encoding.PCM_UNSIGNED;
return encs;
} else {
return new AudioFormat.Encoding[0];
}
}
/**
*/
public AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat){
// filter out targetEncoding from the old getOutputFormats( sourceFormat ) method
AudioFormat[] formats = getOutputFormats( sourceFormat );
Vector newFormats = new Vector();
for(int i=0; i<formats.length; i++ ) {
if( formats[i].getEncoding().equals( targetEncoding ) ) {
newFormats.addElement( formats[i] );
}
}
AudioFormat[] formatArray = new AudioFormat[newFormats.size()];
for (int i = 0; i < formatArray.length; i++) {
formatArray[i] = (AudioFormat)(newFormats.elementAt(i));
}
return formatArray;
}
/**
*/
public AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding, AudioInputStream sourceStream) {
if( isConversionSupported(targetEncoding, sourceStream.getFormat()) ) {
AudioFormat sourceFormat = sourceStream.getFormat();
AudioFormat targetFormat = new AudioFormat( targetEncoding,
sourceFormat.getSampleRate(),
sourceFormat.getSampleSizeInBits(),
sourceFormat.getChannels(),
sourceFormat.getFrameSize(),
sourceFormat.getFrameRate(),
sourceFormat.isBigEndian() );
return getAudioInputStream( targetFormat, sourceStream );
} else {
throw new IllegalArgumentException("Unsupported conversion: " + sourceStream.getFormat().toString() + " to " + targetEncoding.toString() );
}
}
/**
* use old code
*/
public AudioInputStream getAudioInputStream(AudioFormat targetFormat, AudioInputStream sourceStream){
return getConvertedStream( targetFormat, sourceStream );
}
// OLD CODE
/**
* Opens the codec with the specified parameters.
* @param stream stream from which data to be processed should be read
* @param outputFormat desired data format of the stream after processing
* @return stream from which processed data may be read
* @throws IllegalArgumentException if the format combination supplied is
* not supported.
*/
/* public AudioInputStream getConvertedStream(AudioFormat outputFormat, AudioInputStream stream) {*/
private AudioInputStream getConvertedStream(AudioFormat outputFormat, AudioInputStream stream) {
AudioInputStream cs = null;
AudioFormat inputFormat = stream.getFormat();
if( inputFormat.matches(outputFormat) ) {
cs = stream;
} else {
cs = (AudioInputStream) (new PCMtoPCMCodecStream(stream, outputFormat));
tempBuffer = new byte[tempBufferSize];
}
return cs;
}
/**
* Obtains the set of output formats supported by the codec
* given a particular input format.
* If no output formats are supported for this input format,
* returns an array of length 0.
* @return array of supported output formats.
*/
/* public AudioFormat[] getOutputFormats(AudioFormat inputFormat) { */
private AudioFormat[] getOutputFormats(AudioFormat inputFormat) {
Vector formats = new Vector();
AudioFormat format;
int sampleSize = inputFormat.getSampleSizeInBits();
boolean isBigEndian = inputFormat.isBigEndian();
if ( sampleSize==8 ) {
if ( AudioFormat.Encoding.PCM_SIGNED.equals(inputFormat.getEncoding()) ) {
format = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
false );
formats.addElement(format);
}
if ( AudioFormat.Encoding.PCM_UNSIGNED.equals(inputFormat.getEncoding()) ) {
format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
false );
formats.addElement(format);
}
} else if ( sampleSize==16 ) {
if ( AudioFormat.Encoding.PCM_SIGNED.equals(inputFormat.getEncoding()) && isBigEndian ) {
format = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
true );
formats.addElement(format);
format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
false );
formats.addElement(format);
format = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
false );
formats.addElement(format);
}
if ( AudioFormat.Encoding.PCM_UNSIGNED.equals(inputFormat.getEncoding()) && isBigEndian ) {
format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
true );
formats.addElement(format);
format = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
false );
formats.addElement(format);
format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
false );
formats.addElement(format);
}
if ( AudioFormat.Encoding.PCM_SIGNED.equals(inputFormat.getEncoding()) && !isBigEndian ) {
format = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
false );
formats.addElement(format);
format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
true );
formats.addElement(format);
format = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
true );
formats.addElement(format);
}
if ( AudioFormat.Encoding.PCM_UNSIGNED.equals(inputFormat.getEncoding()) && !isBigEndian ) {
format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
false );
formats.addElement(format);
format = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
true );
formats.addElement(format);
format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
inputFormat.getSampleRate(),
inputFormat.getSampleSizeInBits(),
inputFormat.getChannels(),
inputFormat.getFrameSize(),
inputFormat.getFrameRate(),
true );
formats.addElement(format);
}
}
AudioFormat[] formatArray;
synchronized(formats) {
formatArray = new AudioFormat[formats.size()];
for (int i = 0; i < formatArray.length; i++) {
formatArray[i] = (AudioFormat)(formats.elementAt(i));
}
}
return formatArray;
}
class PCMtoPCMCodecStream extends AudioInputStream {
private final int PCM_SWITCH_SIGNED_8BIT = 1;
private final int PCM_SWITCH_ENDIAN = 2;
private final int PCM_SWITCH_SIGNED_LE = 3;
private final int PCM_SWITCH_SIGNED_BE = 4;
private final int PCM_UNSIGNED_LE2SIGNED_BE = 5;
private final int PCM_SIGNED_LE2UNSIGNED_BE = 6;
private final int PCM_UNSIGNED_BE2SIGNED_LE = 7;
private final int PCM_SIGNED_BE2UNSIGNED_LE = 8;
private final int sampleSizeInBytes;
private int conversionType = 0;
PCMtoPCMCodecStream(AudioInputStream stream, AudioFormat outputFormat) {
super(stream, outputFormat, -1);
int sampleSizeInBits = 0;
AudioFormat.Encoding inputEncoding = null;
AudioFormat.Encoding outputEncoding = null;
boolean inputIsBigEndian;
boolean outputIsBigEndian;
AudioFormat inputFormat = stream.getFormat();
// throw an IllegalArgumentException if not ok
if ( ! (isConversionSupported(inputFormat, outputFormat)) ) {
throw new IllegalArgumentException("Unsupported conversion: " + inputFormat.toString() + " to " + outputFormat.toString());
}
inputEncoding = inputFormat.getEncoding();
outputEncoding = outputFormat.getEncoding();
inputIsBigEndian = inputFormat.isBigEndian();
outputIsBigEndian = outputFormat.isBigEndian();
sampleSizeInBits = inputFormat.getSampleSizeInBits();
sampleSizeInBytes = sampleSizeInBits/8;
// determine conversion to perform
if( sampleSizeInBits==8 ) {
if( AudioFormat.Encoding.PCM_UNSIGNED.equals(inputEncoding) &&
AudioFormat.Encoding.PCM_SIGNED.equals(outputEncoding) ) {
conversionType = PCM_SWITCH_SIGNED_8BIT;
if(Printer.debug) Printer.debug("PCMtoPCMCodecStream: conversionType = PCM_SWITCH_SIGNED_8BIT");
} else if( AudioFormat.Encoding.PCM_SIGNED.equals(inputEncoding) &&
AudioFormat.Encoding.PCM_UNSIGNED.equals(outputEncoding) ) {
conversionType = PCM_SWITCH_SIGNED_8BIT;
if(Printer.debug) Printer.debug("PCMtoPCMCodecStream: conversionType = PCM_SWITCH_SIGNED_8BIT");
}
} else {
if( inputEncoding.equals(outputEncoding) && (inputIsBigEndian != outputIsBigEndian) ) {
conversionType = PCM_SWITCH_ENDIAN;
if(Printer.debug) Printer.debug("PCMtoPCMCodecStream: conversionType = PCM_SWITCH_ENDIAN");
} else if (AudioFormat.Encoding.PCM_UNSIGNED.equals(inputEncoding) && !inputIsBigEndian &&
AudioFormat.Encoding.PCM_SIGNED.equals(outputEncoding) && outputIsBigEndian) {
conversionType = PCM_UNSIGNED_LE2SIGNED_BE;
if(Printer.debug) Printer.debug("PCMtoPCMCodecStream: conversionType = PCM_UNSIGNED_LE2SIGNED_BE");
} else if (AudioFormat.Encoding.PCM_SIGNED.equals(inputEncoding) && !inputIsBigEndian &&
AudioFormat.Encoding.PCM_UNSIGNED.equals(outputEncoding) && outputIsBigEndian) {
conversionType = PCM_SIGNED_LE2UNSIGNED_BE;
if(Printer.debug) Printer.debug("PCMtoPCMCodecStream: conversionType = PCM_SIGNED_LE2UNSIGNED_BE");
} else if (AudioFormat.Encoding.PCM_UNSIGNED.equals(inputEncoding) && inputIsBigEndian &&
AudioFormat.Encoding.PCM_SIGNED.equals(outputEncoding) && !outputIsBigEndian) {
conversionType = PCM_UNSIGNED_BE2SIGNED_LE;
if(Printer.debug) Printer.debug("PCMtoPCMCodecStream: conversionType = PCM_UNSIGNED_BE2SIGNED_LE");
} else if (AudioFormat.Encoding.PCM_SIGNED.equals(inputEncoding) && inputIsBigEndian &&
AudioFormat.Encoding.PCM_UNSIGNED.equals(outputEncoding) && !outputIsBigEndian) {
conversionType = PCM_SIGNED_BE2UNSIGNED_LE;
if(Printer.debug) Printer.debug("PCMtoPCMCodecStream: conversionType = PCM_SIGNED_BE2UNSIGNED_LE");
}
}
// set the audio stream length in frames if we know it
frameSize = inputFormat.getFrameSize();
if( frameSize == AudioSystem.NOT_SPECIFIED ) {
frameSize=1;
}
if( stream instanceof AudioInputStream ) {
frameLength = stream.getFrameLength();
} else {
frameLength = AudioSystem.NOT_SPECIFIED;
}
// set framePos to zero
framePos = 0;
}
/**
* Note that this only works for sign conversions.
* Other conversions require a read of at least 2 bytes.
*/
public int read() throws IOException {
// $$jb: do we want to implement this function?
int temp;
byte tempbyte;
if( frameSize==1 ) {
if( conversionType == PCM_SWITCH_SIGNED_8BIT ) {
temp = super.read();
if( temp < 0 ) return temp; // EOF or error
tempbyte = (byte) (temp & 0xf);
tempbyte = (tempbyte >= 0) ? (byte)(0x80 | tempbyte) : (byte)(0x7F & tempbyte);
temp = (int) tempbyte & 0xf;
return temp;
} else {
// $$jb: what to return here?
throw new IOException("cannot read a single byte if frame size > 1");
}
} else {
throw new IOException("cannot read a single byte if frame size > 1");
}
}
public int read(byte[] b) throws IOException {
return read(b, 0, b.length);
}
public int read(byte[] b, int off, int len) throws IOException {
int i;
// don't read fractional frames
if ( len%frameSize != 0 ) {
len -= (len%frameSize);
}
// don't read past our own set length
if( (frameLength!=AudioSystem.NOT_SPECIFIED) && ( (len/frameSize) >(frameLength-framePos)) ) {
len = (int)(frameLength-framePos) * frameSize;
}
int readCount = super.read(b, off, len);
byte tempByte;
if(readCount<0) { // EOF or error
return readCount;
}
// now do the conversions
switch( conversionType ) {
case PCM_SWITCH_SIGNED_8BIT:
switchSigned8bit(b,off,len,readCount);
break;
case PCM_SWITCH_ENDIAN:
switchEndian(b,off,len,readCount);
break;
case PCM_SWITCH_SIGNED_LE:
switchSignedLE(b,off,len,readCount);
break;
case PCM_SWITCH_SIGNED_BE:
switchSignedBE(b,off,len,readCount);
break;
case PCM_UNSIGNED_LE2SIGNED_BE:
case PCM_SIGNED_LE2UNSIGNED_BE:
switchSignedLE(b,off,len,readCount);
switchEndian(b,off,len,readCount);
break;
case PCM_UNSIGNED_BE2SIGNED_LE:
case PCM_SIGNED_BE2UNSIGNED_LE:
switchSignedBE(b,off,len,readCount);
switchEndian(b,off,len,readCount);
break;
default:
// do nothing
}
// we've done the conversion, just return the readCount
return readCount;
}
private void switchSigned8bit(byte[] b, int off, int len, int readCount) {
for(int i=off; i < (off+readCount); i++) {
b[i] = (b[i] >= 0) ? (byte)(0x80 | b[i]) : (byte)(0x7F & b[i]);
}
}
private void switchSignedBE(byte[] b, int off, int len, int readCount) {
for(int i=off; i < (off+readCount); i+= sampleSizeInBytes ) {
b[i] = (b[i] >= 0) ? (byte)(0x80 | b[i]) : (byte)(0x7F & b[i]);
}
}
private void switchSignedLE(byte[] b, int off, int len, int readCount) {
for(int i=(off+sampleSizeInBytes-1); i < (off+readCount); i+= sampleSizeInBytes ) {
b[i] = (b[i] >= 0) ? (byte)(0x80 | b[i]) : (byte)(0x7F & b[i]);
}
}
private void switchEndian(byte[] b, int off, int len, int readCount) {
if(sampleSizeInBytes == 2) {
for(int i=off; i < (off+readCount); i += sampleSizeInBytes ) {
byte temp;
temp = b[i];
b[i] = b[i+1];
b[i+1] = temp;
}
}
}
} // end class PCMtoPCMCodecStream
} // end class PCMtoPCMCodec
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