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* Copyright (C) 2012 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <system/audio.h>
#include <media/ExtendedAudioBufferProvider.h>
#include <media/nbaio/NBAIO.h>
#include <media/nbaio/NBLog.h>
namespace android {
struct FastMixerDumpState;
class VolumeProvider {
// 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;
VolumeProvider() { }
virtual ~VolumeProvider() { }
// Represents the state of a fast track
struct FastTrack {
/*virtual*/ ~FastTrack();
ExtendedAudioBufferProvider* mBufferProvider; // must be NULL if inactive, or non-NULL if active
VolumeProvider* mVolumeProvider; // optional; if NULL then full-scale
unsigned mSampleRate; // optional; if zero then use mixer sample rate
audio_channel_mask_t mChannelMask; // AUDIO_CHANNEL_OUT_MONO or AUDIO_CHANNEL_OUT_STEREO
int mGeneration; // increment when any field is assigned
// Represents a single state of the fast mixer
struct FastMixerState {
/*virtual*/ ~FastMixerState();
static const unsigned kMaxFastTracks = 8; // must be between 2 and 32 inclusive
// all pointer fields use raw pointers; objects are owned and ref-counted by the normal mixer
FastTrack mFastTracks[kMaxFastTracks];
int mFastTracksGen; // increment when any mFastTracks[i].mGeneration is incremented
unsigned mTrackMask; // bit i is set if and only if mFastTracks[i] is active
NBAIO_Sink* mOutputSink; // HAL output device, must already be negotiated
int mOutputSinkGen; // increment when mOutputSink is assigned
size_t mFrameCount; // number of frames per fast mix buffer
enum Command {
INITIAL = 0, // used only for the initial state
HOT_IDLE = 1, // do nothing
COLD_IDLE = 2, // wait for the futex
IDLE = 3, // either HOT_IDLE or COLD_IDLE
EXIT = 4, // exit from thread
// The following commands also process configuration changes, and can be "or"ed:
MIX = 0x8, // mix tracks
WRITE = 0x10, // write to output sink
MIX_WRITE = 0x18, // mix tracks and write to output sink
} mCommand;
int32_t* mColdFutexAddr; // for COLD_IDLE only, pointer to the associated futex
unsigned mColdGen; // increment when COLD_IDLE is requested so it's only performed once
// This might be a one-time configuration rather than per-state
FastMixerDumpState* mDumpState; // if non-NULL, then update dump state periodically
NBAIO_Sink* mTeeSink; // if non-NULL, then duplicate write()s to this non-blocking sink
NBLog::Writer* mNBLogWriter; // non-blocking logger
}; // struct FastMixerState
} // namespace android