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      1 /*
      2  * Copyright (C) 2010 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 /** \file CAudioPlayer.c AudioPlayer class */
     18 
     19 #include "sles_allinclusive.h"
     20 
     21 
     22 /** \brief Hook called by Object::Realize when an audio player is realized */
     23 
     24 SLresult CAudioPlayer_Realize(void *self, SLboolean async)
     25 {
     26     CAudioPlayer *this = (CAudioPlayer *) self;
     27     SLresult result = SL_RESULT_SUCCESS;
     28 
     29 #ifdef ANDROID
     30     result = android_audioPlayer_realize(this, async);
     31 #endif
     32 
     33 #ifdef USE_SNDFILE
     34     result = SndFile_Realize(this);
     35 #endif
     36 
     37     // At this point the channel count and sample rate might still be unknown,
     38     // depending on the data source and the platform implementation.
     39     // If they are unknown here, then they will be determined during prefetch.
     40 
     41     return result;
     42 }
     43 
     44 
     45 /** \brief Hook called by Object::Resume when an audio player is resumed */
     46 
     47 SLresult CAudioPlayer_Resume(void *self, SLboolean async)
     48 {
     49     return SL_RESULT_SUCCESS;
     50 }
     51 
     52 
     53 /** \brief Hook called by Object::Destroy when an audio player is destroyed */
     54 
     55 void CAudioPlayer_Destroy(void *self)
     56 {
     57     CAudioPlayer *this = (CAudioPlayer *) self;
     58     freeDataLocatorFormat(&this->mDataSource);
     59     freeDataLocatorFormat(&this->mDataSink);
     60 #ifdef USE_SNDFILE
     61     SndFile_Destroy(this);
     62 #endif
     63 #ifdef ANDROID
     64     android_audioPlayer_destroy(this);
     65 #endif
     66 }
     67 
     68 
     69 /** \brief Hook called by Object::Destroy before an audio player is about to be destroyed */
     70 
     71 bool CAudioPlayer_PreDestroy(void *self)
     72 {
     73 #ifdef USE_OUTPUTMIXEXT
     74     CAudioPlayer *this = (CAudioPlayer *) self;
     75     // Safe to proceed immediately if a track has not yet been assigned
     76     Track *track = this->mTrack;
     77     if (NULL == track)
     78         return true;
     79     CAudioPlayer *audioPlayer = track->mAudioPlayer;
     80     if (NULL == audioPlayer)
     81         return true;
     82     assert(audioPlayer == this);
     83     // Request the mixer thread to unlink this audio player's track
     84     this->mDestroyRequested = true;
     85     while (this->mDestroyRequested) {
     86         object_cond_wait(self);
     87     }
     88     // Mixer thread has acknowledged the request
     89 #endif
     90     return true;
     91 }
     92 
     93 
     94 /** \brief Given an audio player, return its data sink, which is guaranteed to be a non-NULL output
     95  *  mix.  This function is used by effect send.
     96  */
     97 
     98 COutputMix *CAudioPlayer_GetOutputMix(CAudioPlayer *audioPlayer)
     99 {
    100     assert(NULL != audioPlayer);
    101     assert(SL_DATALOCATOR_OUTPUTMIX == audioPlayer->mDataSink.mLocator.mLocatorType);
    102     SLObjectItf outputMix = audioPlayer->mDataSink.mLocator.mOutputMix.outputMix;
    103     assert(NULL != outputMix);
    104     return (COutputMix *) outputMix;
    105 }
    106