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      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:
     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