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Use 20 ms as the default audio buffer size on Android

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It turns out that Android will not pick a low latency buffer size by default.

(cherry picked from commit c381b2bdfa)
This commit is contained in:
Sam Lantinga
2026-02-13 14:32:46 -08:00
parent d390a4e8f0
commit 2f4919c6ff
1 changed files with 9 additions and 5 deletions
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14
src/audio/aaudio/SDL_aaudio.c
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@@ -321,11 +321,15 @@ static bool BuildAAudioStream(SDL_AudioDevice *device)
ctx.AAudioStreamBuilder_setSampleRate(builder, device->spec.freq);
ctx.AAudioStreamBuilder_setChannelCount(builder, device->spec.channels);
// If no specific buffer size has been requested, the device will pick the optimal
if(SDL_GetHint(SDL_HINT_AUDIO_DEVICE_SAMPLE_FRAMES)) {
ctx.AAudioStreamBuilder_setBufferCapacityInFrames(builder, 2 * device->sample_frames); // AAudio requires that the buffer capacity is at least
ctx.AAudioStreamBuilder_setFramesPerDataCallback(builder, device->sample_frames); // twice the size of the data callback buffer size
}
int32_t sample_frames;
if (SDL_GetHint(SDL_HINT_AUDIO_DEVICE_SAMPLE_FRAMES)) {
sample_frames = device->sample_frames;
} else {
// Use 20 ms for the default audio buffer size
sample_frames = (device->spec.freq / 50);
}
ctx.AAudioStreamBuilder_setBufferCapacityInFrames(builder, 2 * sample_frames); // AAudio requires that the buffer capacity is at least
ctx.AAudioStreamBuilder_setFramesPerDataCallback(builder, sample_frames); // twice the size of the data callback buffer size
const aaudio_direction_t direction = (recording ? AAUDIO_DIRECTION_INPUT : AAUDIO_DIRECTION_OUTPUT);
ctx.AAudioStreamBuilder_setDirection(builder, direction);