1 /* 2 * Copyright (C) 2011 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 AAC_BQ_TO_PCM_H_ 18 #define AAC_BQ_TO_PCM_H_ 19 20 #include "android/android_AudioToCbRenderer.h" 21 #include "android/BufferQueueSource.h" 22 #include "android/include/AacAdtsExtractor.h" 23 24 //-------------------------------------------------------------------------------------------------- 25 namespace android { 26 27 // Class to receive AAC ADTS data through an Android Buffer Queue, decode it and output 28 // the PCM samples through a registered callback (just like its superclass, AudioToCbRenderer). 29 // The implementation mainly overrides AudioSfDecoder::onPrepare() for the specificities 30 // of the data source creation, but all other behavior remains the same (e.g. PCM format metadata) 31 32 class AacBqToPcmCbRenderer : public AudioToCbRenderer 33 { 34 public: 35 36 AacBqToPcmCbRenderer(AudioPlayback_Parameters* params); 37 virtual ~AacBqToPcmCbRenderer(); 38 39 void registerSourceQueueCallback(const void* user, void *context, const void *caller); 40 41 // verifies the given memory starts and ends on ADTS frame boundaries. 42 // This is for instance used whenever ADTS data is being enqueued through an 43 // SL / XA AndroidBufferQueue interface so only parseable ADTS data goes in 44 // the buffer queue, and no ADTS frame is stored across two buffers. 45 static SLresult validateBufferStartEndOnFrameBoundaries(void* data, size_t size); 46 47 protected: 48 49 // Async event handlers (called from GenericPlayer's event loop) 50 virtual void onPrepare(); 51 52 53 private: 54 // mutex used to protect mBqSource 55 Mutex mBqSourceLock; 56 sp<BufferQueueSource> mBqSource; 57 58 private: 59 DISALLOW_EVIL_CONSTRUCTORS(AacBqToPcmCbRenderer); 60 61 }; 62 63 } // namespace android 64 65 #endif //AAC_BQ_TO_PCM_H_ 66