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*
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* 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).
*
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package com.sun.media.sound;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.UnsupportedAudioFileException;
/**
* AIFF file reader and writer.
*
* @author Kara Kytle
* @author Jan Borgersen
* @author Florian Bomers
*/
public final class AiffFileReader extends SunFileReader {
private static final int MAX_READ_LENGTH = 8;
// METHODS TO IMPLEMENT AudioFileReader
/**
* Obtains the audio file format of the input stream provided. The stream must
* point to valid audio file data. In general, audio file providers may
* need to read some data from the stream before determining whether they
* support it. These parsers must
* be able to mark the stream, read enough data to determine whether they
* support the stream, and, if not, reset the stream's read pointer to its original
* position. If the input stream does not support this, this method may fail
* with an IOException.
* @param stream the input stream from which file format information should be
* extracted
* @return an <code>AudioFileFormat</code> object describing the audio file format
* @throws UnsupportedAudioFileException if the stream does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
* @see InputStream#markSupported
* @see InputStream#mark
*/
public AudioFileFormat getAudioFileFormat(InputStream stream) throws UnsupportedAudioFileException, IOException {
// fix for 4489272: AudioSystem.getAudioFileFormat() fails for InputStream, but works for URL
AudioFileFormat aff = getCOMM(stream, true);
// the following is not strictly necessary - but was implemented like that in 1.3.0 - 1.4.1
// so I leave it as it was. May remove this for 1.5.0
stream.reset();
return aff;
}
/**
* Obtains the audio file format of the URL provided. The URL must
* point to valid audio file data.
* @param url the URL from which file format information should be
* extracted
* @return an <code>AudioFileFormat</code> object describing the audio file format
* @throws UnsupportedAudioFileException if the URL does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
*/
public AudioFileFormat getAudioFileFormat(URL url) throws UnsupportedAudioFileException, IOException {
AudioFileFormat fileFormat = null;
InputStream urlStream = url.openStream(); // throws IOException
try {
fileFormat = getCOMM(urlStream, false);
} finally {
urlStream.close();
}
return fileFormat;
}
/**
* Obtains the audio file format of the File provided. The File must
* point to valid audio file data.
* @param file the File from which file format information should be
* extracted
* @return an <code>AudioFileFormat</code> object describing the audio file format
* @throws UnsupportedAudioFileException if the File does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
*/
public AudioFileFormat getAudioFileFormat(File file) throws UnsupportedAudioFileException, IOException {
AudioFileFormat fileFormat = null;
FileInputStream fis = new FileInputStream(file); // throws IOException
// part of fix for 4325421
try {
fileFormat = getCOMM(fis, false);
} finally {
fis.close();
}
return fileFormat;
}
/**
* Obtains an audio stream from the input stream provided. The stream must
* point to valid audio file data. In general, audio file providers may
* need to read some data from the stream before determining whether they
* support it. These parsers must
* be able to mark the stream, read enough data to determine whether they
* support the stream, and, if not, reset the stream's read pointer to its original
* position. If the input stream does not support this, this method may fail
* with an IOException.
* @param stream the input stream from which the <code>AudioInputStream</code> should be
* constructed
* @return an <code>AudioInputStream</code> object based on the audio file data contained
* in the input stream.
* @throws UnsupportedAudioFileException if the stream does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
* @see InputStream#markSupported
* @see InputStream#mark
*/
public AudioInputStream getAudioInputStream(InputStream stream) throws UnsupportedAudioFileException, IOException {
// getCOMM leaves the input stream at the beginning of the audio data
AudioFileFormat fileFormat = getCOMM(stream, true); // throws UnsupportedAudioFileException, IOException
// we've got everything, and the stream is at the
// beginning of the audio data, so return an AudioInputStream.
return new AudioInputStream(stream, fileFormat.getFormat(), fileFormat.getFrameLength());
}
/**
* Obtains an audio stream from the URL provided. The URL must
* point to valid audio file data.
* @param url the URL for which the <code>AudioInputStream</code> should be
* constructed
* @return an <code>AudioInputStream</code> object based on the audio file data pointed
* to by the URL
* @throws UnsupportedAudioFileException if the URL does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
*/
public AudioInputStream getAudioInputStream(URL url) throws UnsupportedAudioFileException, IOException {
InputStream urlStream = url.openStream(); // throws IOException
AudioFileFormat fileFormat = null;
try {
fileFormat = getCOMM(urlStream, false);
} finally {
if (fileFormat == null) {
urlStream.close();
}
}
return new AudioInputStream(urlStream, fileFormat.getFormat(), fileFormat.getFrameLength());
}
/**
* Obtains an audio stream from the File provided. The File must
* point to valid audio file data.
* @param file the File for which the <code>AudioInputStream</code> should be
* constructed
* @return an <code>AudioInputStream</code> object based on the audio file data pointed
* to by the File
* @throws UnsupportedAudioFileException if the File does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
*/
public AudioInputStream getAudioInputStream(File file)
throws UnsupportedAudioFileException, IOException {
FileInputStream fis = new FileInputStream(file); // throws IOException
AudioFileFormat fileFormat = null;
// part of fix for 4325421
try {
fileFormat = getCOMM(fis, false);
} finally {
if (fileFormat == null) {
fis.close();
}
}
return new AudioInputStream(fis, fileFormat.getFormat(), fileFormat.getFrameLength());
}
//--------------------------------------------------------------------
private AudioFileFormat getCOMM(InputStream is, boolean doReset)
throws UnsupportedAudioFileException, IOException {
DataInputStream dis = new DataInputStream(is);
if (doReset) {
dis.mark(MAX_READ_LENGTH);
}
// assumes a stream at the beginning of the file which has already
// passed the magic number test...
// leaves the input stream at the beginning of the audio data
int fileRead = 0;
int dataLength = 0;
AudioFormat format = null;
// Read the magic number
int magic = dis.readInt();
// $$fb: fix for 4369044: javax.sound.sampled.AudioSystem.getAudioInputStream() works wrong with Cp037
if (magic != AiffFileFormat.AIFF_MAGIC) {
// not AIFF, throw exception
if (doReset) {
dis.reset();
}
throw new UnsupportedAudioFileException("not an AIFF file");
}
int length = dis.readInt();
int iffType = dis.readInt();
fileRead += 12;
int totallength;
if(length <= 0 ) {
length = AudioSystem.NOT_SPECIFIED;
totallength = AudioSystem.NOT_SPECIFIED;
} else {
totallength = length + 8;
}
// Is this an AIFC or just plain AIFF file.
boolean aifc = false;
// $$fb: fix for 4369044: javax.sound.sampled.AudioSystem.getAudioInputStream() works wrong with Cp037
if (iffType == AiffFileFormat.AIFC_MAGIC) {
aifc = true;
}
// Loop through the AIFF chunks until
// we get to the SSND chunk.
boolean ssndFound = false;
while (!ssndFound) {
// Read the chunk name
int chunkName = dis.readInt();
int chunkLen = dis.readInt();
fileRead += 8;
int chunkRead = 0;
// Switch on the chunk name.
switch (chunkName) {
case AiffFileFormat.FVER_MAGIC:
// Ignore format version for now.
break;
case AiffFileFormat.COMM_MAGIC:
// AIFF vs. AIFC
// $$fb: fix for 4399551: Repost of bug candidate: cannot replay aif file (Review ID: 108108)
if ((!aifc && chunkLen < 18) || (aifc && chunkLen < 22)) {
throw new UnsupportedAudioFileException("Invalid AIFF/COMM chunksize");
}
// Read header info.
int channels = dis.readUnsignedShort();
if (channels <= 0) {
throw new UnsupportedAudioFileException("Invalid number of channels");
}
dis.readInt(); // numSampleFrames
int sampleSizeInBits = dis.readUnsignedShort();
if (sampleSizeInBits < 1 || sampleSizeInBits > 32) {
throw new UnsupportedAudioFileException("Invalid AIFF/COMM sampleSize");
}
float sampleRate = (float) read_ieee_extended(dis);
chunkRead += (2 + 4 + 2 + 10);
// If this is not AIFC then we assume it's
// a linearly encoded file.
AudioFormat.Encoding encoding = AudioFormat.Encoding.PCM_SIGNED;
if (aifc) {
int enc = dis.readInt(); chunkRead += 4;
switch (enc) {
case AiffFileFormat.AIFC_PCM:
encoding = AudioFormat.Encoding.PCM_SIGNED;
break;
case AiffFileFormat.AIFC_ULAW:
encoding = AudioFormat.Encoding.ULAW;
sampleSizeInBits = 8; // Java Sound convention
break;
default:
throw new UnsupportedAudioFileException("Invalid AIFF encoding");
}
}
int frameSize = calculatePCMFrameSize(sampleSizeInBits, channels);
//$fb what's that ??
//if (sampleSizeInBits == 8) {
// encoding = AudioFormat.Encoding.PCM_SIGNED;
//}
format = new AudioFormat(encoding, sampleRate,
sampleSizeInBits, channels,
frameSize, sampleRate, true);
break;
case AiffFileFormat.SSND_MAGIC:
// Data chunk.
// we are getting *weird* numbers for chunkLen sometimes;
// this really should be the size of the data chunk....
int dataOffset = dis.readInt();
int blocksize = dis.readInt();
chunkRead += 8;
// okay, now we are done reading the header. we need to set the size
// of the data segment. we know that sometimes the value we get for
// the chunksize is absurd. this is the best i can think of:if the
// value seems okay, use it. otherwise, we get our value of
// length by assuming that everything left is the data segment;
// its length should be our original length (for all AIFF data chunks)
// minus what we've read so far.
// $$kk: we should be able to get length for the data chunk right after
// we find "SSND." however, some aiff files give *weird* numbers. what
// is going on??
if (chunkLen < length) {
dataLength = chunkLen - chunkRead;
} else {
// $$kk: 11.03.98: this seems dangerous!
dataLength = length - (fileRead + chunkRead);
}
ssndFound = true;
break;
} // switch
fileRead += chunkRead;
// skip the remainder of this chunk
if (!ssndFound) {
int toSkip = chunkLen - chunkRead;
if (toSkip > 0) {
fileRead += dis.skipBytes(toSkip);
}
}
} // while
if (format == null) {
throw new UnsupportedAudioFileException("missing COMM chunk");
}
AudioFileFormat.Type type = aifc?AudioFileFormat.Type.AIFC:AudioFileFormat.Type.AIFF;
return new AiffFileFormat(type, totallength, format, dataLength / format.getFrameSize());
}
// HELPER METHODS
/** write_ieee_extended(DataOutputStream dos, double f) throws IOException {
* Extended precision IEEE floating-point conversion routine.
/**代码未完, 请加载全部代码(NowJava.com).**/
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