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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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#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>
#include <media/nbaio/NBLog.h>
#include "FastThreadState.h"
namespace android {
struct FastMixerDumpState;
class VolumeProvider {
public:
// 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() { }
};
// Represents the state of a fast track
struct FastTrack {
FastTrack();
/*virtual*/ ~FastTrack();
ExtendedAudioBufferProvider* mBufferProvider; // must be NULL if inactive, or non-NULL if active
VolumeProvider* mVolumeProvider; // optional; if NULL then full-scale
audio_channel_mask_t mChannelMask; // AUDIO_CHANNEL_OUT_MONO or AUDIO_CHANNEL_OUT_STEREO
audio_format_t mFormat; // track format
int mGeneration; // increment when any field is assigned
};
// Represents a single state of the fast mixer
struct FastMixerState : FastThreadState {
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
// Extends FastThreadState::Command
static const Command
// 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
// This might be a one-time configuration rather than per-state
NBAIO_Sink* mTeeSink; // if non-NULL, then duplicate write()s to this non-blocking sink
// never returns NULL; asserts if command is invalid
static const char *commandToString(Command command);
}; // struct FastMixerState
} // namespace android
#endif // ANDROID_AUDIO_FAST_MIXER_STATE_H
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