Pass stereo gains as packed minifloat
This will allow (eventually) a greater dynamic range for gains.
However there are still a few remaining places in effects and mixer
that will also need to be changed in order to get the full benefit.
Also fixes a minor bug: was not checking for NaN in AudioTrack C++.
Change-Id: I63bce9e82e0a61546d8ff475fb94bcb700d99c96
diff --git a/services/audioflinger/FastMixerState.h b/services/audioflinger/FastMixerState.h
index be1a376..e388fb3 100644
--- a/services/audioflinger/FastMixerState.h
+++ b/services/audioflinger/FastMixerState.h
@@ -17,6 +17,7 @@
#ifndef ANDROID_AUDIO_FAST_MIXER_STATE_H
#define ANDROID_AUDIO_FAST_MIXER_STATE_H
+#include <audio_utils/minifloat.h>
#include <system/audio.h>
#include <media/ExtendedAudioBufferProvider.h>
#include <media/nbaio/NBAIO.h>
@@ -29,9 +30,8 @@
class VolumeProvider {
public:
- // Return the track volume in U4_12 format: left in lower half, right in upper half. The
- // provider implementation is responsible for validating that the return value is in range.
- virtual uint32_t getVolumeLR() = 0;
+ // The provider implementation is responsible for validating that the return value is in range.
+ virtual gain_minifloat_packed_t getVolumeLR() = 0;
protected:
VolumeProvider() { }
virtual ~VolumeProvider() { }