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Working buffer size should be around 0.1-0.3 sec of data

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- This appears to work on a wide grange of older Gingerbread through to the latest Nexus class devices
    - TODO : we really should write a dynamic calculation/adjustment routine to determine the best working buffer for
      any device this code runs on =)
This commit is contained in:
Aaron Culliney 2015-07-05 13:00:08 -07:00
parent 8ecab7cf91
commit dfbb13906a
1 changed files with 6 additions and 19 deletions
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25
src/audio/soundcore-opensles.c
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@ -597,26 +597,13 @@ static long opensles_systemSetup(INOUT AudioContext_s **audio_context) {
// latency ... this is less aggressive than calculations made in DevicePropertyCalculator.java
android_monoBufferSubmitSizeSamples >>= 1;
android_stereoBufferSubmitSizeSamples >>= 1;
opensles_audio_backend.systemSettings.monoBufferSizeSamples = android_deviceSampleRateHz * 0.3/*sec*/;
opensles_audio_backend.systemSettings.stereoBufferSizeSamples = android_deviceSampleRateHz * 0.3/*sec*/;
} else {
opensles_audio_backend.systemSettings.monoBufferSizeSamples = android_deviceSampleRateHz * 0.125/*sec*/;
opensles_audio_backend.systemSettings.stereoBufferSizeSamples = android_deviceSampleRateHz * 0.125/*sec*/;
}
// TODO FIXME ... the *4 is a leaky abstraction from speaker.c ...
// The "goldilocks zone" is between 1/4 to 1/2 of the total buffer size.
// Also with fast sample rates and smaller buffer sizes ... the speaker feedback to the CPU appears not to be fast
// enough and so we get frequent underruns and glitching ... TODO FIXME investigate this ...
unsigned long idealMonoBufferSizeSamples = 4 * android_monoBufferSubmitSizeSamples;
if (idealMonoBufferSizeSamples < 8192) {
// clamp to a larger minimum buffer size to avoid underflows
idealMonoBufferSizeSamples = 8192;
}
unsigned long idealStereoBufferSizeSamples = 4 * android_stereoBufferSubmitSizeSamples;
if (idealStereoBufferSizeSamples < 16384) {
// clamp to a larger minimum buffer size to avoid underflows
idealStereoBufferSizeSamples = 16384;
}
opensles_audio_backend.systemSettings.monoBufferSizeSamples = idealMonoBufferSizeSamples;
opensles_audio_backend.systemSettings.stereoBufferSizeSamples = idealStereoBufferSizeSamples;
#warning TODO FIXME ^^^^^ need a dynamic bufferSize calculation/calibration routine to determine optimal buffer size for device ... may also need a user-initiated calibration too
do {
//