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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_H
#define ANDROID_AUDIO_FAST_MIXER_H
#include <utils/Thread.h>
extern "C" {
#include "../private/bionic_futex.h"
}
#include "StateQueue.h"
#include "FastMixerState.h"
namespace android {
typedef StateQueue<FastMixerState> FastMixerStateQueue;
class FastMixer : public Thread {
public:
FastMixer() : Thread(false /*canCallJava*/) { }
virtual ~FastMixer() { }
FastMixerStateQueue* sq() { return &mSQ; }
private:
virtual bool threadLoop();
FastMixerStateQueue mSQ;
}; // class FastMixer
// Represents the dump state of a fast track
struct FastTrackDump {
FastTrackDump() : mUnderruns(0) { }
/*virtual*/ ~FastTrackDump() { }
uint32_t mUnderruns; // Underrun status, represented as follows:
// bit 0 == 0 means not currently in underrun
// bit 0 == 1 means currently in underrun
// bits 1 to 31 == total number of underruns
// Not reset to zero for new tracks or if track generation changes.
// This representation is used to keep the information atomic.
};
// The FastMixerDumpState keeps a cache of FastMixer statistics that can be logged by dumpsys.
// Each individual native word-sized field is accessed atomically. But the
// overall structure is non-atomic, that is there may be an inconsistency between fields.
// No barriers or locks are used for either writing or reading.
// Only POD types are permitted, and the contents shouldn't be trusted (i.e. do range checks).
// It has a different lifetime than the FastMixer, and so it can't be a member of FastMixer.
struct FastMixerDumpState {
FastMixerDumpState();
/*virtual*/ ~FastMixerDumpState();
void dump(int fd);
FastMixerState::Command mCommand; // current command
uint32_t mWriteSequence; // incremented before and after each write()
uint32_t mFramesWritten; // total number of frames written successfully
uint32_t mNumTracks; // total number of active fast tracks
uint32_t mWriteErrors; // total number of write() errors
uint32_t mUnderruns; // total number of underruns
uint32_t mOverruns; // total number of overruns
uint32_t mSampleRate;
size_t mFrameCount;
struct timespec mMeasuredWarmupTs; // measured warmup time
uint32_t mWarmupCycles; // number of loop cycles required to warmup
FastTrackDump mTracks[FastMixerState::kMaxFastTracks];
#ifdef FAST_MIXER_STATISTICS
// cycle times in seconds
float mMean;
float mMinimum;
float mMaximum;
float mStddev;
#endif
};
} // namespace android
#endif // ANDROID_AUDIO_FAST_MIXER_H
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