1 /* 2 * Copyright (C) 2009 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_BUFFER_GROUP_H_ 18 19 #define MEDIA_BUFFER_GROUP_H_ 20 21 #include <media/stagefright/MediaBuffer.h> 22 #include <utils/Errors.h> 23 #include <utils/threads.h> 24 25 namespace android { 26 27 class MediaBuffer; 28 class MetaData; 29 30 class MediaBufferGroup : public MediaBufferObserver { 31 public: 32 MediaBufferGroup(); 33 ~MediaBufferGroup(); 34 35 void add_buffer(MediaBuffer *buffer); 36 37 // Blocks until a buffer is available and returns it to the caller, 38 // the returned buffer will have a reference count of 1. 39 status_t acquire_buffer(MediaBuffer **buffer); 40 41 protected: 42 virtual void signalBufferReturned(MediaBuffer *buffer); 43 44 private: 45 friend class MediaBuffer; 46 47 Mutex mLock; 48 Condition mCondition; 49 50 MediaBuffer *mFirstBuffer, *mLastBuffer; 51 52 MediaBufferGroup(const MediaBufferGroup &); 53 MediaBufferGroup &operator=(const MediaBufferGroup &); 54 }; 55 56 } // namespace android 57 58 #endif // MEDIA_BUFFER_GROUP_H_ 59