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Merge pull request hex007#192 from AShiningRay/ima-adpcm-support
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PlatformPlayer: Implement initial IMA ADPCM decoding support
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recompileorg authored Oct 12, 2023
2 parents 2b745e2 + 5f68847 commit d8aa5d9
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Showing 2 changed files with 464 additions and 6 deletions.
39 changes: 33 additions & 6 deletions src/org/recompile/mobile/PlatformPlayer.java
Original file line number Diff line number Diff line change
Expand Up @@ -274,10 +274,15 @@ public boolean isRunning()

private class wavPlayer extends audioplayer
{

/* PCM WAV variables */
private AudioInputStream wavStream;
private Clip wavClip;

/* IMA ADPCM WAV variables */
private WavImaAdpcmDecoder adpcmDec = new WavImaAdpcmDecoder();
InputStream decodedStream;
private int[] wavHeaderData = new int[4];

/* Player control variables */
private int loops = 0;

private long time = 0L;
Expand All @@ -286,10 +291,32 @@ public wavPlayer(InputStream stream)
{
try
{
wavStream = AudioSystem.getAudioInputStream(stream);
wavClip = AudioSystem.getClip();
wavClip.open(wavStream);
state = Player.PREFETCHED;
/*
* A wav header is generally 44-bytes long, and it is what we need to read in order to get
* the stream's format, frame size, bit rate, number of channels, etc. which gives us information
* on the kind of codec needed to play or decode the incoming stream. The stream needs to be reset
* or else PCM files will be loaded without a header and it might cause issues with playback.
*/
stream.mark(48);
wavHeaderData = adpcmDec.readHeader(stream);
stream.reset();

/* We only check for IMA ADPCM at the moment. */
if(wavHeaderData[0] != 17) /* If it's not IMA ADPCM we don't need to do anything to the stream. */
{
wavStream = AudioSystem.getAudioInputStream(stream);
wavClip = AudioSystem.getClip();
wavClip.open(wavStream);
state = Player.PREFETCHED;
}
else /* But if it is IMA ADPCM, we have to decode it manually. */
{
decodedStream = adpcmDec.decodeImaAdpcm(stream, wavHeaderData);
wavStream = AudioSystem.getAudioInputStream(decodedStream);
wavClip = AudioSystem.getClip();
wavClip.open(wavStream);
state = Player.PREFETCHED;
}
}
catch (Exception e)
{
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