1 /* 2 * Copyright (C) 2013 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 MEDIA_ADAPTER_H 18 #define MEDIA_ADAPTER_H 19 20 #include <media/stagefright/MediaSource.h> 21 #include <media/stagefright/foundation/ABase.h> 22 #include <media/stagefright/MediaBuffer.h> 23 #include <media/stagefright/MetaData.h> 24 #include <utils/threads.h> 25 26 namespace android { 27 28 // Convert the MediaMuxer's push model into MPEG4Writer's pull model. 29 // Used only by the MediaMuxer for now. 30 struct MediaAdapter : public MediaSource, public MediaBufferObserver { 31 public: 32 // MetaData is used to set the format and returned at getFormat. 33 MediaAdapter(const sp<MetaData> &meta); 34 virtual ~MediaAdapter(); 35 ///////////////////////////////////////////////// 36 // Inherited functions from MediaSource 37 ///////////////////////////////////////////////// 38 39 virtual status_t start(MetaData *params = NULL); 40 virtual status_t stop(); 41 virtual sp<MetaData> getFormat(); 42 virtual status_t read( 43 MediaBufferBase **buffer, const ReadOptions *options = NULL); 44 45 ///////////////////////////////////////////////// 46 // Inherited functions from MediaBufferObserver 47 ///////////////////////////////////////////////// 48 49 virtual void signalBufferReturned(MediaBufferBase *buffer); 50 51 ///////////////////////////////////////////////// 52 // Non-inherited functions: 53 ///////////////////////////////////////////////// 54 55 // pushBuffer() will wait for the read() finish, and read() will have a 56 // deep copy, such that after pushBuffer return, the buffer can be re-used. 57 status_t pushBuffer(MediaBuffer *buffer); 58 59 private: 60 Mutex mAdapterLock; 61 std::mutex mBufferGatingMutex; 62 // Make sure the read() wait for the incoming buffer. 63 Condition mBufferReadCond; 64 // Make sure the pushBuffer() wait for the current buffer consumed. 65 Condition mBufferReturnedCond; 66 67 MediaBuffer *mCurrentMediaBuffer; 68 69 bool mStarted; 70 sp<MetaData> mOutputFormat; 71 72 DISALLOW_EVIL_CONSTRUCTORS(MediaAdapter); 73 }; 74 75 } // namespace android 76 77 #endif // MEDIA_ADAPTER_H 78