audio: Adjust stream buffer size calculation
When calculating buffer size, use powers of two
for "large" buffers only on SRs >= 44100 Hz.
With lower SRs, sizes rounded up to a multiple
of 2 give too high latency.
Bug: 328432688
Test: repro steps from b/328432688#comment3
Test: atest VtsHalAudioCoreTargetTest
Change-Id: I605ef8507fef030d349e85c33ed0229c9566ddb5
diff --git a/audio/aidl/default/include/core-impl/Module.h b/audio/aidl/default/include/core-impl/Module.h
index d6e8905..a326217 100644
--- a/audio/aidl/default/include/core-impl/Module.h
+++ b/audio/aidl/default/include/core-impl/Module.h
@@ -213,7 +213,7 @@
sampleRateHz);
// Round up to nearest 16 frames since in the framework this is the size of a mixer burst.
const int32_t multipleOf16 = (rawSizeFrames + 15) & ~15;
- if (multipleOf16 <= 512) return multipleOf16;
+ if (sampleRateHz < 44100 || multipleOf16 <= 512) return multipleOf16;
// Larger buffers should use powers of 2.
int32_t powerOf2 = 1;
while (powerOf2 < multipleOf16) powerOf2 <<= 1;