audiohal: Support stateful downmixer effects
Fraunhofer's downmixer has additional buffering, this is incompatible
with how DownmixerBufferProvider used to process incomplete buffers.
Now the effects HIDL wrapper delivers frameCount updates in
audiobuffers to the server side. This fixes playback of multichannel
sound streams.
Bug: 36181621
Test: play 5.1 track from Play Music
Change-Id: I3b2cd097d61873c6ba329f1a574235ac88b21cac
diff --git a/media/libaudiohal/include/EffectBufferHalInterface.h b/media/libaudiohal/include/EffectBufferHalInterface.h
index 6fa7940..e862f6e 100644
--- a/media/libaudiohal/include/EffectBufferHalInterface.h
+++ b/media/libaudiohal/include/EffectBufferHalInterface.h
@@ -39,6 +39,8 @@
virtual void setExternalData(void* external) = 0;
virtual void setFrameCount(size_t frameCount) = 0;
+ virtual bool checkFrameCountChange() = 0; // returns whether frame count has been updated
+ // since the last call to this method
virtual void update() = 0; // copies data from the external buffer, noop for allocated buffers
virtual void commit() = 0; // copies data to the external buffer, noop for allocated buffers