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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_AUDIO_FAST_MIXER_H
     18 #define ANDROID_AUDIO_FAST_MIXER_H
     19 
     20 #include <atomic>
     21 #include "FastThread.h"
     22 #include "StateQueue.h"
     23 #include "FastMixerState.h"
     24 #include "FastMixerDumpState.h"
     25 
     26 namespace android {
     27 
     28 class AudioMixer;
     29 
     30 typedef StateQueue<FastMixerState> FastMixerStateQueue;
     31 
     32 class FastMixer : public FastThread {
     33 
     34 public:
     35             FastMixer();
     36     virtual ~FastMixer();
     37 
     38             FastMixerStateQueue* sq();
     39 
     40     virtual void setMasterMono(bool mono) { mMasterMono.store(mono); /* memory_order_seq_cst */ }
     41     virtual void setBoottimeOffset(int64_t boottimeOffset) {
     42         mBoottimeOffset.store(boottimeOffset); /* memory_order_seq_cst */
     43     }
     44 private:
     45             FastMixerStateQueue mSQ;
     46 
     47     // callouts
     48     virtual const FastThreadState *poll();
     49     virtual void setNBLogWriter(NBLog::Writer *logWriter);
     50     virtual void onIdle();
     51     virtual void onExit();
     52     virtual bool isSubClassCommand(FastThreadState::Command command);
     53     virtual void onStateChange();
     54     virtual void onWork();
     55 
     56     // FIXME these former local variables need comments
     57     static const FastMixerState sInitial;
     58 
     59     FastMixerState  mPreIdle;   // copy of state before we went into idle
     60     int             mGenerations[FastMixerState::kMaxFastTracks];
     61                                 // last observed mFastTracks[i].mGeneration
     62     NBAIO_Sink*     mOutputSink;
     63     int             mOutputSinkGen;
     64     AudioMixer*     mMixer;
     65 
     66     // mSinkBuffer audio format is stored in format.mFormat.
     67     void*           mSinkBuffer;        // used for mixer output format translation
     68                                         // if sink format is different than mixer output.
     69     size_t          mSinkBufferSize;
     70     uint32_t        mSinkChannelCount;
     71     audio_channel_mask_t mSinkChannelMask;
     72     void*           mMixerBuffer;       // mixer output buffer.
     73     size_t          mMixerBufferSize;
     74     audio_format_t  mMixerBufferFormat; // mixer output format: AUDIO_FORMAT_PCM_(16_BIT|FLOAT).
     75 
     76     enum {UNDEFINED, MIXED, ZEROED} mMixerBufferState;
     77     NBAIO_Format    mFormat;
     78     unsigned        mSampleRate;
     79     int             mFastTracksGen;
     80     FastMixerDumpState mDummyFastMixerDumpState;
     81     int64_t         mTotalNativeFramesWritten;  // copied to dumpState->mFramesWritten
     82 
     83     // next 2 fields are valid only when timestampStatus == NO_ERROR
     84     ExtendedTimestamp mTimestamp;
     85     int64_t         mNativeFramesWrittenButNotPresented;
     86 
     87     // accessed without lock between multiple threads.
     88     std::atomic_bool mMasterMono;
     89     std::atomic_int_fast64_t mBoottimeOffset;
     90 };  // class FastMixer
     91 
     92 }   // namespace android
     93 
     94 #endif  // ANDROID_AUDIO_FAST_MIXER_H
     95