1 /* 2 ** 3 ** Copyright 2017, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #ifndef INCLUDING_FROM_AUDIOFLINGER_H 19 #error This header file should only be included from AudioFlinger.h 20 #endif 21 22 // playback track 23 class MmapTrack : public TrackBase { 24 public: 25 MmapTrack(ThreadBase *thread, 26 const audio_attributes_t& attr, 27 uint32_t sampleRate, 28 audio_format_t format, 29 audio_channel_mask_t channelMask, 30 audio_session_t sessionId, 31 bool isOut, 32 const android::content::AttributionSourceState& attributionSource, 33 pid_t creatorPid, 34 audio_port_handle_t portId = AUDIO_PORT_HANDLE_NONE); 35 virtual ~MmapTrack(); 36 37 // TrackBase virtual 38 virtual status_t initCheck() const; 39 virtual status_t start(AudioSystem::sync_event_t event, 40 audio_session_t triggerSession); 41 virtual void stop(); isFastTrack()42 virtual bool isFastTrack() const { return false; } isDirect()43 bool isDirect() const override { return true; } 44 45 void appendDumpHeader(String8& result); 46 void appendDump(String8& result, bool active); 47 48 // protected by MMapThread::mLock setSilenced_l(bool silenced)49 void setSilenced_l(bool silenced) { mSilenced = silenced; 50 mSilencedNotified = false;} 51 // protected by MMapThread::mLock isSilenced_l()52 bool isSilenced_l() const { return mSilenced; } 53 // protected by MMapThread::mLock getAndSetSilencedNotified_l()54 bool getAndSetSilencedNotified_l() { bool silencedNotified = mSilencedNotified; 55 mSilencedNotified = true; 56 return silencedNotified; } 57 private: 58 friend class MmapThread; 59 60 DISALLOW_COPY_AND_ASSIGN(MmapTrack); 61 62 // AudioBufferProvider interface 63 virtual status_t getNextBuffer(AudioBufferProvider::Buffer* buffer); 64 // releaseBuffer() not overridden 65 66 // ExtendedAudioBufferProvider interface 67 virtual size_t framesReady() const; 68 virtual int64_t framesReleased() const; 69 virtual void onTimestamp(const ExtendedTimestamp ×tamp); 70 71 pid_t mPid; 72 bool mSilenced; // protected by MMapThread::mLock 73 bool mSilencedNotified; // protected by MMapThread::mLock 74 }; // end of Track 75 76