aaudio: rework buffer sizing strategy, treat latency as performance hint#836
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For output, use 2 bursts (matching Oboe defaults) for low-latency streams and keep defaults for power-saving; for input, maximize buffer size to reduce XRuns. Remove hardcoded setFramesPerDataCallback/ setBufferCapacityInFrames and let AAudio choose optimal values. Check the actual performance mode granted by AAudio rather than the requested latency to decide whether to tune the output buffer. This avoids shrinking the buffer below AAudio's default when the mode is downgraded (e.g. Bluetooth routing).
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This is green on CI. |
Pehrsons
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Mar 24, 2026
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LGTM
I trust you've done a fair bit of manual testing across devices (phones and headphones) here.
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I've tested a bunch of scenarios across: Xiaomi Redmi 14C (Android 14), Samsung S9+ (Android 10), and the emulator (various versions) with several Bluetooth and wired headphones/headsets plus the built-in speakers. |
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Rework our AAudio backend's buffer sizing strategy based on AAudio best practices and a thorough review of the decisions made in liboboe and Chromium. Also only do buffer size tuning if
LOW_LATENCYperformance mode was actually granted.Note that we no longer call
setFramesPerDataCallback, so we'll get data callbacks in AAudio's preferred size rather than forcing sizes that could result in internal buffering in AAudio. I think this will be better for latency/performance, but if it turns out to be problematic we can revisit this.This also makes
0005-increase-aaudio-powersaving-buffering.patchin Gecko obsolete, so it will be dropped when this change is imported.