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 25namespace android { 26 27class MediaBuffer; 28class MetaData; 29 30class MediaBufferGroup : public MediaBufferObserver { 31public: 32 MediaBufferGroup(); 33 ~MediaBufferGroup(); 34 35 void add_buffer(MediaBuffer *buffer); 36 37 // If nonBlocking is false, it blocks until a buffer is available and 38 // passes it to the caller in *buffer, while returning OK. 39 // The returned buffer will have a reference count of 1. 40 // If nonBlocking is true and a buffer is not immediately available, 41 // buffer is set to NULL and it returns WOULD_BLOCK. 42 status_t acquire_buffer(MediaBuffer **buffer, bool nonBlocking = false); 43 44protected: 45 virtual void signalBufferReturned(MediaBuffer *buffer); 46 47private: 48 friend class MediaBuffer; 49 50 Mutex mLock; 51 Condition mCondition; 52 53 MediaBuffer *mFirstBuffer, *mLastBuffer; 54 55 MediaBufferGroup(const MediaBufferGroup &); 56 MediaBufferGroup &operator=(const MediaBufferGroup &); 57}; 58 59} // namespace android 60 61#endif // MEDIA_BUFFER_GROUP_H_ 62