1 /* 2 ** 3 ** Copyright 2008, 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 ANDROID_AUDIO_OUTPUT_H 19 #define ANDROID_AUDIO_OUTPUT_H 20 21 #include <utils/Errors.h> 22 23 #include "android_audio_mio.h" 24 #include "utils/Timers.h" 25 26 using namespace android; 27 28 class AndroidAudioOutput : public AndroidAudioMIO 29 { 30 public: 31 OSCL_IMPORT_REF AndroidAudioOutput(); 32 OSCL_IMPORT_REF ~AndroidAudioOutput(); 33 34 virtual PVMFCommandId QueryUUID(const PvmfMimeString& aMimeType, Oscl_Vector<PVUuid, 35 OsclMemAllocator>& aUuids, bool aExactUuidsOnly=false, 36 const OsclAny* aContext=NULL); 37 38 virtual PVMFCommandId QueryInterface(const PVUuid& aUuid, PVInterface*& aInterfacePtr, 39 const OsclAny* aContext=NULL); 40 41 virtual void setParametersSync(PvmiMIOSession aSession, PvmiKvp* aParameters, 42 int num_elements, PvmiKvp * & aRet_kvp); 43 44 virtual PVMFCommandId DiscardData(PVMFTimestamp aTimestamp=0, const OsclAny* aContext=NULL); 45 46 virtual void cancelCommand(PVMFCommandId aCmdId); 47 48 virtual PVMFCommandId Stop(const OsclAny* aContext=NULL); 49 virtual PVMFCommandId Reset(const OsclAny* aContext=NULL); 50 51 52 private: 53 54 // Audio output request handling 55 // this mio queues the requests, the audio output thread dequeues and processes them 56 class OSSRequest 57 { 58 public: OSSRequest(uint8 * data,uint32 len,PVMFCommandId id,const OsclAny * ctx,const PVMFTimestamp & ts)59 OSSRequest(uint8* data, uint32 len, PVMFCommandId id, const OsclAny* ctx, const PVMFTimestamp& ts) : 60 iData(data), iDataLen(len), iCmdId(id), iContext(ctx), iTimestamp(ts) 61 {} 62 uint8* iData; 63 uint32 iDataLen; 64 PVMFCommandId iCmdId; 65 const OsclAny* iContext; 66 PVMFTimestamp iTimestamp; 67 }; 68 69 virtual void writeAudioBuffer(uint8* aData, uint32 aDataLen, PVMFCommandId cmdId, 70 OsclAny* aContext, PVMFTimestamp aTimestamp); 71 72 virtual void Run(); 73 74 virtual void returnAllBuffers(); 75 76 void RequestAndWaitForThreadExit(); 77 78 static int start_audout_thread_func(TOsclThreadFuncArg arg); 79 int audout_thread_func(); 80 81 // semaphores used to communicate with the audio output thread 82 OsclSemaphore* iAudioThreadSem; 83 OsclSemaphore* iAudioThreadTermSem; 84 OsclSemaphore* iAudioThreadReturnSem; 85 OsclSemaphore* iAudioThreadCreatedSem; 86 87 volatile bool iExitAudioThread; 88 volatile bool iReturnBuffers; 89 90 // active timing 91 AndroidAudioMIOActiveTimingSupport* iActiveTiming; 92 93 // oss request queue, needs to use lock mechanism to access 94 Oscl_Vector<OSSRequest,OsclMemAllocator> iOSSRequestQueue; 95 96 // lock used to access the oss request queue 97 OsclMutex iOSSRequestQueueLock; 98 99 // number of bytes in an input frame 100 int iInputFrameSizeInBytes; 101 102 // Wallclock time in nano secs to find the interval between write calls done to device. 103 nsecs_t iClockTimeOfWriting_ns; 104 }; 105 106 #endif // ANDROID_AUDIO_OUTPUT_H 107 108