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 BUFFERQUEUE_SOURCE_H_ 18 #define BUFFERQUEUE_SOURCE_H_ 19 20 #include <media/stagefright/DataSource.h> 21 22 // number of SLuint32 fields to store a buffer event message in an item, by mapping each 23 // to the item key (SLuint32), the item size (SLuint32), and the item data (mask on SLuint32) 24 #define NB_BUFFEREVENT_ITEM_FIELDS 3 25 26 namespace android { 27 28 // a Stagefright DataSource that pulls data from an AndroidBufferQueue 29 30 class BufferQueueSource : public DataSource { 31 public: 32 33 // store an item structure to indicate a processed buffer 34 static const SLuint32 kItemProcessed[NB_BUFFEREVENT_ITEM_FIELDS]; 35 36 BufferQueueSource(IAndroidBufferQueue *androidBufferQueue); 37 38 virtual status_t initCheck() const; 39 40 virtual ssize_t readAt(off64_t offset, void *data, size_t size); 41 42 virtual status_t getSize(off64_t *size); 43 44 virtual ~BufferQueueSource(); 45 46 private: 47 // the Android Buffer Queue from which data is consumed 48 IAndroidBufferQueue* const mAndroidBufferQueueSource; 49 50 // a monotonically increasing offset used to translate an offset from the beginning 51 // of the stream, to an offset in each buffer from the buffer queue source 52 off64_t mStreamToBqOffset; 53 54 // indicates whether an EOS command has been reached when consuming the buffers in the queue 55 bool mEosReached; 56 57 BufferQueueSource(const BufferQueueSource &); 58 BufferQueueSource &operator=(const BufferQueueSource &); 59 }; 60 61 } // namespace android 62 63 #endif // BUFFERQUEUE_SOURCE_H_ 64 65
