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 <list> 22 23 #include <media/stagefright/MediaBufferBase.h> 24 #include <utils/Errors.h> 25 #include <utils/threads.h> 26 27 namespace android { 28 29 class MediaBufferBase; 30 31 class MediaBufferGroup : public MediaBufferObserver { 32 public: 33 MediaBufferGroup(size_t growthLimit = 0); 34 35 // create a media buffer group with preallocated buffers 36 MediaBufferGroup(size_t buffers, size_t buffer_size, size_t growthLimit = 0); 37 38 ~MediaBufferGroup(); 39 40 void add_buffer(MediaBufferBase *buffer); 41 42 bool has_buffers(); 43 44 // If nonBlocking is false, it blocks until a buffer is available and 45 // passes it to the caller in *buffer, while returning OK. 46 // The returned buffer will have a reference count of 1. 47 // If nonBlocking is true and a buffer is not immediately available, 48 // buffer is set to NULL and it returns WOULD_BLOCK. 49 // If requestedSize is 0, any free MediaBuffer will be returned. 50 // If requestedSize is > 0, the returned MediaBuffer should have buffer 51 // size of at least requstedSize. 52 status_t acquire_buffer( 53 MediaBufferBase **buffer, bool nonBlocking = false, size_t requestedSize = 0); 54 55 size_t buffers() const; 56 57 // If buffer is nullptr, have acquire_buffer() check for remote release. 58 virtual void signalBufferReturned(MediaBufferBase *buffer); 59 60 private: 61 struct InternalData; 62 InternalData *mInternal; 63 64 MediaBufferGroup(const MediaBufferGroup &); 65 MediaBufferGroup &operator=(const MediaBufferGroup &); 66 }; 67 68 } // namespace android 69 70 #endif // MEDIA_BUFFER_GROUP_H_ 71
