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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 <linux/futex.h>
     21 #include <sys/syscall.h>
     22 #include <utils/Debug.h>
     23 #include "FastThread.h"
     24 #include <utils/Thread.h>
     25 #include "StateQueue.h"
     26 #include "FastMixerState.h"
     27 #include "FastMixerDumpState.h"
     28 
     29 namespace android {
     30 
     31 class AudioMixer;
     32 
     33 typedef StateQueue<FastMixerState> FastMixerStateQueue;
     34 
     35 class FastMixer : public FastThread {
     36 
     37 public:
     38             FastMixer();
     39     virtual ~FastMixer();
     40 
     41             FastMixerStateQueue* sq();
     42 
     43 private:
     44             FastMixerStateQueue mSQ;
     45 
     46     // callouts
     47     virtual const FastThreadState *poll();
     48     virtual void setLog(NBLog::Writer *logWriter);
     49     virtual void onIdle();
     50     virtual void onExit();
     51     virtual bool isSubClassCommand(FastThreadState::Command command);
     52     virtual void onStateChange();
     53     virtual void onWork();
     54 
     55     // FIXME these former local variables need comments and to be renamed to have "m" prefix
     56     static const FastMixerState initial;
     57     FastMixerState preIdle; // copy of state before we went into idle
     58     long slopNs;        // accumulated time we've woken up too early (> 0) or too late (< 0)
     59     int fastTrackNames[FastMixerState::kMaxFastTracks]; // handles used by mixer to identify tracks
     60     int generations[FastMixerState::kMaxFastTracks];    // last observed mFastTracks[i].mGeneration
     61     NBAIO_Sink *outputSink;
     62     int outputSinkGen;
     63     AudioMixer* mixer;
     64 
     65     // mSinkBuffer audio format is stored in format.mFormat.
     66     void* mSinkBuffer;                  // used for mixer output format translation
     67                                         // if sink format is different than mixer output.
     68     size_t mSinkBufferSize;
     69     uint32_t mSinkChannelCount;
     70     audio_channel_mask_t mSinkChannelMask;
     71     void* mMixerBuffer;                 // mixer output buffer.
     72     size_t mMixerBufferSize;
     73     audio_format_t mMixerBufferFormat;  // mixer output format: AUDIO_FORMAT_PCM_(16_BIT|FLOAT).
     74 
     75     enum {UNDEFINED, MIXED, ZEROED} mMixerBufferState;
     76     NBAIO_Format format;
     77     unsigned sampleRate;
     78     int fastTracksGen;
     79     FastMixerDumpState dummyDumpState;
     80     uint32_t totalNativeFramesWritten;  // copied to dumpState->mFramesWritten
     81 
     82     // next 2 fields are valid only when timestampStatus == NO_ERROR
     83     AudioTimestamp timestamp;
     84     uint32_t nativeFramesWrittenButNotPresented;
     85 
     86 };  // class FastMixer
     87 
     88 }   // namespace android
     89 
     90 #endif  // ANDROID_AUDIO_FAST_MIXER_H
     91