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14b429de8d
Although half (non-fast track on sink rate) or one-third (non-fast track not on sink rate) of the buffer size of the created AudioTrack instance as the SL Enqueue buffer size is basically enough for dropout-free playback, only using the full size can avoid stutter upon (re)start of playback. Here are the various buffer sizes on different track/sink rate when on Bluetooth audio on Android O: aptX @ 48kHz: Sink rate: 48000 Hz 44100 Hz: 10632 frames (241.09 ms) 48000 Hz: 11544 frames (240.50 ms) 88200 Hz: 21216 frames (240.54 ms) 96000 Hz: 23088 frames (240.50 ms) 176400 Hz: 42384 frames (240.27 ms) 192000 Hz: 46128 frames (240.25 ms) SBC/AAC/aptX @ 44.1kHz: Sink rate: 44100 Hz 44100 Hz: 10776 frames (244.35 ms) 48000 Hz: 11748 frames (244.75 ms) 88200 Hz: 21552 frames (244.35 ms) 96000 Hz: 23448 frames (244.25 ms) 176400 Hz: 43056 frames (244.08 ms) 192000 Hz: 46848 frames (244.00 ms) The above results were produced with the following code: import android.media.AudioAttributes; import android.media.AudioFormat; import android.media.AudioTrack; class AudioInfo { public static void main(String[] args) { int nosr = AudioTrack.getNativeOutputSampleRate(3); System.out.printf("Sink rate: %d Hz\n", nosr); int[] rates = {44100,48000,88200,96000,176400,192000}; for (int rate: rates) { AudioAttributes aa = new AudioAttributes.Builder().setFlags(256).build(); AudioFormat af = new AudioFormat.Builder().setSampleRate(rate).build(); AudioTrack at = new AudioTrack(aa, af, 4, 1, 0); int sr = at.getSampleRate(); int bs = at.getBufferSizeInFrames(); float ms = bs * (float) 1000 / sr; at.release(); System.out.printf("%d Hz: %d frames (%.2f ms)\n", sr, bs, ms); } } } Therefore bumping the device buffer size to 250ms. |
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.. | ||
ao_alsa.c | ||
ao_audiounit.m | ||
ao_coreaudio_chmap.c | ||
ao_coreaudio_chmap.h | ||
ao_coreaudio_exclusive.c | ||
ao_coreaudio_properties.c | ||
ao_coreaudio_properties.h | ||
ao_coreaudio_utils.c | ||
ao_coreaudio_utils.h | ||
ao_coreaudio.c | ||
ao_jack.c | ||
ao_lavc.c | ||
ao_null.c | ||
ao_openal.c | ||
ao_opensles.c | ||
ao_oss.c | ||
ao_pcm.c | ||
ao_pulse.c | ||
ao_rsound.c | ||
ao_sdl.c | ||
ao_sndio.c | ||
ao_wasapi_changenotify.c | ||
ao_wasapi_utils.c | ||
ao_wasapi.c | ||
ao_wasapi.h | ||
ao.c | ||
ao.h | ||
internal.h | ||
pull.c | ||
push.c |