public AudioFormat[] getTargetFormats(
AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat) {
if ((AudioFormat.Encoding.PCM_SIGNED.equals(targetEncoding)
&& AudioFormat.Encoding.ULAW.equals(sourceFormat.getEncoding()))
|| (AudioFormat.Encoding.ULAW.equals(targetEncoding)
&& AudioFormat.Encoding.PCM_SIGNED.equals(sourceFormat.getEncoding()))) {
return getOutputFormats(sourceFormat);
} else {
return new AudioFormat[0];
}
}
public AudioInputStream getAudioInputStream(
AudioFormat.Encoding targetEncoding, AudioInputStream sourceStream) {
AudioFormat sourceFormat = sourceStream.getFormat();
AudioFormat.Encoding sourceEncoding = sourceFormat.getEncoding();
if (sourceEncoding.equals(targetEncoding)) {
return sourceStream;
} else {
AudioFormat targetFormat = null;
if (!isConversionSupported(targetEncoding, sourceStream.getFormat())) {
throw new IllegalArgumentException(
"Unsupported conversion: "
+ sourceStream.getFormat().toString()
+ " to "
+ targetEncoding.toString());
}
if (AudioFormat.Encoding.ULAW.equals(sourceEncoding)
&& AudioFormat.Encoding.PCM_SIGNED.equals(targetEncoding)) {
targetFormat =
new AudioFormat(
targetEncoding,
sourceFormat.getSampleRate(),
16,
sourceFormat.getChannels(),
2 * sourceFormat.getChannels(),
sourceFormat.getSampleRate(),
sourceFormat.isBigEndian());
} else if (AudioFormat.Encoding.PCM_SIGNED.equals(sourceEncoding)
&& AudioFormat.Encoding.ULAW.equals(targetEncoding)) {
targetFormat =
new AudioFormat(
targetEncoding,
sourceFormat.getSampleRate(),
8,
sourceFormat.getChannels(),
sourceFormat.getChannels(),
sourceFormat.getSampleRate(),
false);
} else {
throw new IllegalArgumentException(
"Unsupported conversion: "
+ sourceStream.getFormat().toString()
+ " to "
+ targetEncoding.toString());
}
return getAudioInputStream(targetFormat, sourceStream);
}
}
/* public AudioFormat[] getOutputFormats(AudioFormat inputFormat) { */
private AudioFormat[] getOutputFormats(AudioFormat inputFormat) {
Vector formats = new Vector();
AudioFormat format;
if ((inputFormat.getSampleSizeInBits() == 16)
&& AudioFormat.Encoding.PCM_SIGNED.equals(inputFormat.getEncoding())) {
format =
new AudioFormat(
AudioFormat.Encoding.ULAW,
inputFormat.getSampleRate(),
8,
inputFormat.getChannels(),
inputFormat.getChannels(),
inputFormat.getSampleRate(),
false);
formats.addElement(format);
}
if (AudioFormat.Encoding.ULAW.equals(inputFormat.getEncoding())) {
format =
new AudioFormat(
AudioFormat.Encoding.PCM_SIGNED,
inputFormat.getSampleRate(),
16,
inputFormat.getChannels(),
inputFormat.getChannels() * 2,
inputFormat.getSampleRate(),
false);
formats.addElement(format);
format =
new AudioFormat(
AudioFormat.Encoding.PCM_SIGNED,
inputFormat.getSampleRate(),
16,
inputFormat.getChannels(),
inputFormat.getChannels() * 2,
inputFormat.getSampleRate(),
true);
formats.addElement(format);
}
AudioFormat[] formatArray = new AudioFormat[formats.size()];
for (int i = 0; i < formatArray.length; i++) {
formatArray[i] = (AudioFormat) (formats.elementAt(i));
}
return formatArray;
}
/**
* Numbers used here are verbatim from Javazoom
*
* @param baseFormat
* @return
*/
private AudioFormat getDecodedFormat(AudioFormat baseFormat) {
// Do we need to "decode" the base format?
if (AudioFormat.Encoding.PCM_SIGNED.equals(baseFormat.getEncoding())
|| AudioFormat.Encoding.PCM_UNSIGNED.equals(baseFormat.getEncoding())) {
return baseFormat;
}
return new AudioFormat(
AudioFormat.Encoding.PCM_SIGNED,
baseFormat.getSampleRate(),
16,
baseFormat.getChannels(),
baseFormat.getChannels() * 2,
baseFormat.getSampleRate(),
false);
}
@Override
public AudioFileFormat.Type[] getAudioFileTypes(AudioInputStream stream) {
AudioFileFormat.Type[] filetypes = new AudioFileFormat.Type[types.length];
System.arraycopy(types, 0, filetypes, 0, types.length);
// make sure we can write this stream
AudioFormat format = stream.getFormat();
AudioFormat.Encoding encoding = format.getEncoding();
if (AudioFormat.Encoding.ALAW.equals(encoding)
|| AudioFormat.Encoding.ULAW.equals(encoding)
|| AudioFormat.Encoding.PCM_SIGNED.equals(encoding)
|| AudioFormat.Encoding.PCM_UNSIGNED.equals(encoding)) {
return filetypes;
}
return new AudioFileFormat.Type[0];
}
public AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat) {
if (AudioFormat.Encoding.PCM_SIGNED.equals(sourceFormat.getEncoding())) {
if (sourceFormat.getSampleSizeInBits() == 16) {
AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1];
enc[0] = AudioFormat.Encoding.ULAW;
return enc;
} else {
return new AudioFormat.Encoding[0];
}
} else if (AudioFormat.Encoding.ULAW.equals(sourceFormat.getEncoding())) {
if (sourceFormat.getSampleSizeInBits() == 8) {
AudioFormat.Encoding enc[] = new AudioFormat.Encoding[1];
enc[0] = AudioFormat.Encoding.PCM_SIGNED;
return enc;
} else {
return new AudioFormat.Encoding[0];
}
} else {
return new AudioFormat.Encoding[0];
}
}
private InputStream getFileStream(WaveFileFormat waveFileFormat, InputStream audioStream)
throws IOException {
// private method ... assumes audioFileFormat is a supported file type
// WAVE header fields
AudioFormat audioFormat = waveFileFormat.getFormat();
int headerLength = waveFileFormat.getHeaderSize();
int riffMagic = WaveFileFormat.RIFF_MAGIC;
int waveMagic = WaveFileFormat.WAVE_MAGIC;
int fmtMagic = WaveFileFormat.FMT_MAGIC;
int fmtLength = WaveFileFormat.getFmtChunkSize(waveFileFormat.getWaveType());
short wav_type = (short) waveFileFormat.getWaveType();
short channels = (short) audioFormat.getChannels();
short sampleSizeInBits = (short) audioFormat.getSampleSizeInBits();
int sampleRate = (int) audioFormat.getSampleRate();
int frameSizeInBytes = audioFormat.getFrameSize();
int frameRate = (int) audioFormat.getFrameRate();
int avgBytesPerSec = channels * sampleSizeInBits * sampleRate / 8;
short blockAlign = (short) ((sampleSizeInBits / 8) * channels);
int dataMagic = WaveFileFormat.DATA_MAGIC;
int dataLength = waveFileFormat.getFrameLength() * frameSizeInBytes;
int length = waveFileFormat.getByteLength();
int riffLength = dataLength + headerLength - 8;
byte header[] = null;
ByteArrayInputStream headerStream = null;
ByteArrayOutputStream baos = null;
DataOutputStream dos = null;
SequenceInputStream waveStream = null;
AudioFormat audioStreamFormat = null;
AudioFormat.Encoding encoding = null;
InputStream codedAudioStream = audioStream;
// if audioStream is an AudioInputStream and we need to convert, do it here...
if (audioStream instanceof AudioInputStream) {
audioStreamFormat = ((AudioInputStream) audioStream).getFormat();
encoding = audioStreamFormat.getEncoding();
if (AudioFormat.Encoding.PCM_SIGNED.equals(encoding)) {
if (sampleSizeInBits == 8) {
wav_type = WaveFileFormat.WAVE_FORMAT_PCM;
// plug in the transcoder to convert from PCM_SIGNED to PCM_UNSIGNED
codedAudioStream =
AudioSystem.getAudioInputStream(
new AudioFormat(
AudioFormat.Encoding.PCM_UNSIGNED,
audioStreamFormat.getSampleRate(),
audioStreamFormat.getSampleSizeInBits(),
audioStreamFormat.getChannels(),
audioStreamFormat.getFrameSize(),
audioStreamFormat.getFrameRate(),
false),
(AudioInputStream) audioStream);
}
}
if ((AudioFormat.Encoding.PCM_SIGNED.equals(encoding) && audioStreamFormat.isBigEndian())
|| (AudioFormat.Encoding.PCM_UNSIGNED.equals(encoding)
&& !audioStreamFormat.isBigEndian())
|| (AudioFormat.Encoding.PCM_UNSIGNED.equals(encoding)
&& audioStreamFormat.isBigEndian())) {
if (sampleSizeInBits != 8) {
wav_type = WaveFileFormat.WAVE_FORMAT_PCM;
// plug in the transcoder to convert to PCM_SIGNED_LITTLE_ENDIAN
codedAudioStream =
AudioSystem.getAudioInputStream(
new AudioFormat(
AudioFormat.Encoding.PCM_SIGNED,
audioStreamFormat.getSampleRate(),
audioStreamFormat.getSampleSizeInBits(),
audioStreamFormat.getChannels(),
audioStreamFormat.getFrameSize(),
audioStreamFormat.getFrameRate(),
false),
(AudioInputStream) audioStream);
}
}
}
// Now push the header into a stream, concat, and return the new SequenceInputStream
baos = new ByteArrayOutputStream();
dos = new DataOutputStream(baos);
// we write in littleendian...
dos.writeInt(riffMagic);
dos.writeInt(big2little(riffLength));
dos.writeInt(waveMagic);
dos.writeInt(fmtMagic);
dos.writeInt(big2little(fmtLength));
dos.writeShort(big2littleShort(wav_type));
dos.writeShort(big2littleShort(channels));
dos.writeInt(big2little(sampleRate));
dos.writeInt(big2little(avgBytesPerSec));
dos.writeShort(big2littleShort(blockAlign));
dos.writeShort(big2littleShort(sampleSizeInBits));
// $$fb 2002-04-16: Fix for 4636355: RIFF audio headers could be _more_ spec compliant
if (wav_type != WaveFileFormat.WAVE_FORMAT_PCM) {
// add length 0 for "codec specific data length"
dos.writeShort(0);
}
dos.writeInt(dataMagic);
dos.writeInt(big2little(dataLength));
dos.close();
header = baos.toByteArray();
headerStream = new ByteArrayInputStream(header);
waveStream = new SequenceInputStream(headerStream, new NoCloseInputStream(codedAudioStream));
return waveStream;
}