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/*
* AiffAudioFileReader.java
*
* This file is part of Tritonus: http://www.tritonus.org/
*/
/*
* Copyright (c) 2000 by Florian Bomers <http://www.bomers.de>
* Copyright (c) 1999 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.sampled.file;
import java.io.DataInputStream;
import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.UnsupportedAudioFileException;
import org.tritonus.share.sampled.file.TAudioFileFormat;
import org.tritonus.share.sampled.file.TAudioFileReader;
import org.tritonus.share.TDebug;
/** Class for reading AIFF and AIFF-C files.
*
* @author Florian Bomers
* @author Matthias Pfisterer
*/
public class AiffAudioFileReader extends TAudioFileReader
{
private static final int READ_LIMIT = 1000;
public AiffAudioFileReader()
{
super(READ_LIMIT);
}
private void skipChunk(DataInputStream dataInputStream, int chunkLength, int chunkRead)
throws IOException {
chunkLength-=chunkRead;
if (chunkLength>0) {
dataInputStream.skip(chunkLength + (chunkLength % 2));
}
}
private AudioFormat readCommChunk(DataInputStream dataInputStream, int chunkLength)
throws IOException, UnsupportedAudioFileException {
int nNumChannels = dataInputStream.readShort();
if (nNumChannels <= 0) {
throw new UnsupportedAudioFileException(
"not an AIFF file: number of channels must be positive");
}
if (TDebug.TraceAudioFileReader) {
TDebug.out("Found "+nNumChannels+" channels.");
}
// ignored: frame count
dataInputStream.readInt();
int nSampleSize = dataInputStream.readShort();
float fSampleRate = (float) readIeeeExtended(dataInputStream);
if (fSampleRate <= 0.0) {
throw new UnsupportedAudioFileException(
"not an AIFF file: sample rate must be positive");
}
if (TDebug.TraceAudioFileReader) {
TDebug.out("Found framerate "+fSampleRate);
}
AudioFormat.Encoding encoding = AudioFormat.Encoding.PCM_SIGNED;
int nRead=18;
if (chunkLength>nRead) {
int nEncoding=dataInputStream.readInt();
nRead+=4;
if (nEncoding==AiffTool.AIFF_COMM_PCM) {
// PCM - nothing to do
}
else if (nEncoding==AiffTool.AIFF_COMM_ULAW) {
// ULAW
encoding=AudioFormat.Encoding.ULAW;
nSampleSize=8;
}
else if (nEncoding==AiffTool.AIFF_COMM_IMA_ADPCM) {
encoding = new AudioFormat.Encoding("IMA_ADPCM");
nSampleSize=4;
}
else {
throw new UnsupportedAudioFileException(
"Encoding 0x"+Integer.toHexString(nEncoding)
+" of AIFF file not supported");
}
}
/* In case of IMA ADPCM, frame size is 0.5 bytes (since it is
always mono). A value of 1 as frame size would be wrong.
Handling of frame size 0 in defined nowhere. So the best
solution is to set the frame size to unspecified (-1).
*/
int nFrameSize = (nSampleSize == 4) ?
AudioSystem.NOT_SPECIFIED :
calculateFrameSize(nSampleSize, nNumChannels);
if (TDebug.TraceAudioFileReader) { TDebug.out("calculated frame size: " + nFrameSize); }
skipChunk(dataInputStream, chunkLength, nRead);
AudioFormat format = new AudioFormat(encoding,
fSampleRate,
nSampleSize,
nNumChannels,
nFrameSize,
fSampleRate,
true);
return format;
}
private void readVerChunk(DataInputStream dataInputStream, int chunkLength)
throws IOException, UnsupportedAudioFileException {
if (chunkLength<4) {
throw new UnsupportedAudioFileException(
"Corrput AIFF file: FVER chunk too small.");
}
int nVer=dataInputStream.readInt();
if (nVer!=AiffTool.AIFF_FVER_TIME_STAMP) {
throw new UnsupportedAudioFileException(
"Unsupported AIFF file: version not known.");
}
skipChunk(dataInputStream, chunkLength, 4);
}
protected AudioFileFormat getAudioFileFormat(InputStream inputStream, long lFileSizeInBytes)
throws UnsupportedAudioFileException, IOException
{
if (TDebug.TraceAudioFileReader) {TDebug.out("AiffAudioFileReader.getAudioFileFormat(InputStream, long): begin"); }
DataInputStream dataInputStream = new DataInputStream(inputStream);
int nMagic = dataInputStream.readInt();
if (nMagic != AiffTool.AIFF_FORM_MAGIC) {
throw new UnsupportedAudioFileException(
"not an AIFF file: header magic is not FORM");
}
int nTotalLength = dataInputStream.readInt();
nMagic = dataInputStream.readInt();
boolean bIsAifc;
if (nMagic == AiffTool.AIFF_AIFF_MAGIC) {
bIsAifc = false;
} else if (nMagic == AiffTool.AIFF_AIFC_MAGIC) {
bIsAifc = true;
} else {
throw new UnsupportedAudioFileException(
"unsupported IFF file: header magic neither AIFF nor AIFC");
}
boolean bFVerFound=!bIsAifc;
boolean bCommFound=false;
boolean bSSndFound=false;
AudioFormat format=null;
int nDataChunkLength=0;
// walk through the chunks
// chunks may be in any order. However, in this implementation, SSND must be last
while (!bFVerFound || !bCommFound || !bSSndFound) {
nMagic = dataInputStream.readInt();
int nChunkLength = dataInputStream.readInt();
switch (nMagic) {
case AiffTool.AIFF_COMM_MAGIC:
format=readCommChunk(dataInputStream, nChunkLength);
if (TDebug.TraceAudioFileReader) {
TDebug.out("Read COMM chunk with length "+nChunkLength);
}
bCommFound=true;
break;
case AiffTool.AIFF_FVER_MAGIC:
if (!bFVerFound) {
readVerChunk(dataInputStream, nChunkLength);
if (TDebug.TraceAudioFileReader) {
TDebug.out("Read FVER chunk with length "+nChunkLength);
}
bFVerFound=true;
} else {
skipChunk(dataInputStream, nChunkLength, 0);
}
break;
case AiffTool.AIFF_SSND_MAGIC:
if (!bCommFound || !bFVerFound) {
throw new UnsupportedAudioFileException(
"cannot handle AIFF file: SSND not last chunk");
}
bSSndFound=true;
nDataChunkLength=nChunkLength-8;
// 8 information bytes of no interest
dataInputStream.skip(8);
if (TDebug.TraceAudioFileReader) {
TDebug.out("Found SSND chunk with length "+nChunkLength);
}
break;
default:
if (TDebug.TraceAudioFileReader) {
TDebug.out("Skipping unknown chunk: "
+Integer.toHexString(nMagic));
}
skipChunk(dataInputStream, nChunkLength, 0);
break;
}
}
// TODO: length argument has to be in frames
AudioFileFormat audioFileFormat = new TAudioFileFormat(
bIsAifc ? AudioFileFormat.Type.AIFC : AudioFileFormat.Type.AIFF,
format,
nDataChunkLength / format.getFrameSize(),
nTotalLength + 8);
if (TDebug.TraceAudioFileReader) {TDebug.out("AiffAudioFileReader.getAudioFileFormat(InputStream, long): end"); }
return audioFileFormat;
}
}
/*** AiffAudioFileReader.java ***/
|
