NativeDecoderpublic class NativeDecoder extends AudioCodec
| Fields Summary |
|---|
| private int | pendingDataSize | | private static final int | OUTSIZE | | private byte[] | pendingData | | private MpegAudio | mpa | | private int | nativeData | | private boolean | expectingSameInputBuffer | | private long | accumTS | | private AudioFormat | aFormat | | int[] | inRead | | int[] | inReq | | int[] | outWritten |
| Constructors Summary |
|---|
public NativeDecoder()
inputFormats = new Format[] {
/*
new AudioFormat(AudioFormat.MPEGLAYER3,
16000.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
new AudioFormat(AudioFormat.MPEGLAYER3,
22050.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
new AudioFormat(AudioFormat.MPEGLAYER3,
24000.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
new AudioFormat(AudioFormat.MPEGLAYER3,
32000.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
new AudioFormat(AudioFormat.MPEGLAYER3,
44100.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
new AudioFormat(AudioFormat.MPEGLAYER3,
48000.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
*/
new AudioFormat(AudioFormat.MPEG,
16000.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
new AudioFormat(AudioFormat.MPEG,
22050.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
new AudioFormat(AudioFormat.MPEG,
24000.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
new AudioFormat(AudioFormat.MPEG,
32000.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
new AudioFormat(AudioFormat.MPEG,
44100.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
new AudioFormat(AudioFormat.MPEG,
48000.,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED, // endian
AudioFormat.SIGNED),
};
|
| Methods Summary |
|---|
| public synchronized void | close()
if (nativeData != 0) {
mpa.nClose(nativeData);
nativeData = 0;
}
| | public java.lang.String | getName()
return "MPEG Layer 2 Decoder";
| | public javax.media.Format[] | getSupportedOutputFormats(javax.media.Format input)
if (input == null) {
return new Format[] { new AudioFormat(AudioFormat.LINEAR) };
} else if (input instanceof AudioFormat) {
AudioFormat af = (AudioFormat) input;
AudioFormat output = new AudioFormat(AudioFormat.LINEAR,
af.getSampleRate(),
af.getSampleSizeInBits(),
af.getChannels(),
AudioFormat.BIG_ENDIAN,
/*
The new version of the native
codec is adjusted to output
BIG_ENDIAN on both platforms.
Arch.isBigEndian()?
AudioFormat.BIG_ENDIAN :
AudioFormat.LITTLE_ENDIAN,
*/
AudioFormat.SIGNED);
outputFormats = new Format[] { output };
} else {
outputFormats = new Format[0];
}
return outputFormats;
| | public synchronized void | open()
if (nativeData != 0)
close();
try {
JMFSecurityManager.loadLibrary("jmutil");
JMFSecurityManager.loadLibrary("jmmpa");
mpa = new MpegAudio();
nativeData = mpa.nOpen(new int[1]);
if (nativeData == 0)
throw new ResourceUnavailableException("could not open " + getName());
pendingDataSize = 0;
expectingSameInputBuffer = false;
accumTS = 0;
aFormat = (AudioFormat)outputFormat;
//System.err.println("Input format is " + inputFormat);
//System.err.println("Output format is " + outputFormat);
return;
} catch (Throwable e) {
//System.err.println(e);
}
throw new ResourceUnavailableException("could not open " + getName());
| | public synchronized int | process(javax.media.Buffer in, javax.media.Buffer out)
boolean inputEOM = false;
if (isEOM(in)) {
if (pendingDataSize == 0) {
propagateEOM(out);
return BUFFER_PROCESSED_OK;
}
inputEOM = true;
}
Object inObject = in.getData();
Object outObject = out.getData();
if (outObject == null) {
outObject = new byte[OUTSIZE];
out.setData(outObject);
}
if (!(inObject instanceof byte[]) || !(outObject instanceof byte[]))
return BUFFER_PROCESSED_FAILED;
byte [] inData = (byte[]) inObject;
byte [] outData = (byte[]) outObject;
int inOffset = in.getOffset();
int inLength = in.getLength();
int outdataSize = outData.length;
int outOffset = 0;
int pendingDataOffset = 0;
if (!expectingSameInputBuffer) {
System.arraycopy(inData, inOffset, pendingData, pendingDataSize,
inLength);
pendingDataSize += inLength;
}
inReq[0] = 21;
if (nativeData != 0) {
while (true) {
// Does the output buffer have enough space left?
if (outOffset + 5000 > outdataSize)
break;
if (pendingDataSize < inReq[0])
break;
boolean returnVal =
MpegAudio.nConvert(nativeData,
pendingData, pendingDataOffset, pendingDataSize,
outData, outOffset, outdataSize - outOffset,
inRead, outWritten,
pendingDataOffset, inReq);
if (returnVal) {
// Decoded ok. There was some data written
//sbd: patch: if read more then available ignore last audio frame
if (inRead[0] > pendingDataSize) {
//System.out.println("mpa error: Read more than available !");
break;
}
outOffset += outWritten[0];
pendingDataOffset += inRead[0];
pendingDataSize -= inRead[0];
if (inReq[0] == 0)
inReq[0] = 21;
// For MP3, need header from next frame to remain in
// pendingData until EOM to deal with negative offset
// 9 = header with CRC + negative offset + 1 for pad
if (pendingDataSize < inRead[0] + 9)
break;
} else {
//System.err.println("NativeDecoder: error from nConvert!");
// If there was an error
// If there's some output data, break out of the loop
if (outOffset > 0)
break;
// else we've decoded nothing. return false.
else {
pendingDataSize = 0;
if (inputEOM) {
// Ignore error if EOM buffer
outOffset = 0;
break;
} else {
return BUFFER_PROCESSED_FAILED;
}
}
}
}
}
// Move the last chunk to the beginning of the pendingData buffer
if (pendingDataOffset != 0)
System.arraycopy(pendingData, pendingDataOffset,
pendingData, 0, pendingDataSize);
out.setLength(outOffset);
out.setFormat(outputFormat);
if (aFormat != null && accumTS != 0 && in.getTimeStamp() > 0)
out.setTimeStamp(in.getTimeStamp() + aFormat.computeDuration(accumTS));
if (inputEOM) {
if (outOffset == 0) {
// trying to process last bit of data and it isn't usable,
// discard it to avoid a loop and propagate EOM.
pendingDataSize = 0;
propagateEOM(out);
return BUFFER_PROCESSED_OK;
}
// processed remaining frame(s), return data and repeat the EOM.
expectingSameInputBuffer = true;
accumTS += out.getLength();
return BUFFER_PROCESSED_OK | INPUT_BUFFER_NOT_CONSUMED;
}
if (pendingDataSize > 1024) {
expectingSameInputBuffer = true;
accumTS += out.getLength();
return BUFFER_PROCESSED_OK | INPUT_BUFFER_NOT_CONSUMED;
} else {
expectingSameInputBuffer = false;
accumTS = 0;
return BUFFER_PROCESSED_OK;
}
| | public synchronized void | reset()
if (nativeData != 0) {
close();
try {
open();
} catch (ResourceUnavailableException rue) {
Log.error("MP2 Decoder: " + rue);
}
}
|
|
