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Use a 2 frame audio buffer if possible to reduce audio latency

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This commit is contained in:
Cameron Gutman 2014-11-13 21:16:14 -08:00
parent 9d72314b9c
commit dfc3daabcd
1 changed files with 41 additions and 14 deletions
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53
app/src/main/java/com/limelight/binding/audio/AndroidAudioRenderer.java
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@ -31,23 +31,50 @@ public class AndroidAudioRenderer implements AudioRenderer {
return false;
}
bufferSize = Math.max(AudioTrack.getMinBufferSize(sampleRate,
channelConfig,
AudioFormat.ENCODING_PCM_16BIT),
FRAME_SIZE * 2);
// We're not supposed to request less than the minimum
// buffer size for our buffer, but it appears that we can
// do this on many devices and it lowers audio latency.
// We'll try the small buffer size first and if it fails,
// use the recommended larger buffer size.
try {
// Buffer two frames of audio if possible
bufferSize = FRAME_SIZE * 2;
// Round to next frame
bufferSize = (((bufferSize + (FRAME_SIZE - 1)) / FRAME_SIZE) * FRAME_SIZE);
track = new AudioTrack(AudioManager.STREAM_MUSIC,
sampleRate,
channelConfig,
AudioFormat.ENCODING_PCM_16BIT,
bufferSize,
AudioTrack.MODE_STREAM);
track.play();
} catch (Exception e) {
// Try to release the AudioTrack if we got far enough
try {
if (track != null) {
track.release();
}
} catch (Exception ignored) {}
// Now try the larger buffer size
bufferSize = Math.max(AudioTrack.getMinBufferSize(sampleRate,
channelConfig,
AudioFormat.ENCODING_PCM_16BIT),
FRAME_SIZE * 2);
// Round to next frame
bufferSize = (((bufferSize + (FRAME_SIZE - 1)) / FRAME_SIZE) * FRAME_SIZE);
track = new AudioTrack(AudioManager.STREAM_MUSIC,
sampleRate,
channelConfig,
AudioFormat.ENCODING_PCM_16BIT,
bufferSize,
AudioTrack.MODE_STREAM);
track.play();
}
LimeLog.info("Audio track buffer size: "+bufferSize);
track = new AudioTrack(AudioManager.STREAM_MUSIC,
sampleRate,
channelConfig,
AudioFormat.ENCODING_PCM_16BIT,
bufferSize,
AudioTrack.MODE_STREAM);
track.play();
return true;
}