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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef BUFFERQUEUE_SOURCE_H_
#define BUFFERQUEUE_SOURCE_H_
#include <media/stagefright/DataSource.h>
// number of SLuint32 fields to store a buffer event message in an item, by mapping each
// to the item key (SLuint32), the item size (SLuint32), and the item data (mask on SLuint32)
#define NB_BUFFEREVENT_ITEM_FIELDS 3
namespace android {
// a Stagefright DataSource that pulls data from an AndroidBufferQueue
class BufferQueueSource : public DataSource {
public:
// store an item structure to indicate a processed buffer
static const SLuint32 kItemProcessed[NB_BUFFEREVENT_ITEM_FIELDS];
BufferQueueSource(IAndroidBufferQueue *androidBufferQueue);
virtual status_t initCheck() const;
virtual ssize_t readAt(off64_t offset, void *data, size_t size);
virtual status_t getSize(off64_t *size);
virtual ~BufferQueueSource();
private:
// the Android Buffer Queue from which data is consumed
IAndroidBufferQueue* const mAndroidBufferQueueSource;
// a monotonically increasing offset used to translate an offset from the beginning
// of the stream, to an offset in each buffer from the buffer queue source
off64_t mStreamToBqOffset;
// indicates whether an EOS command has been reached when consuming the buffers in the queue
bool mEosReached;
BufferQueueSource(const BufferQueueSource &);
BufferQueueSource &operator=(const BufferQueueSource &);
};
} // namespace android
#endif // BUFFERQUEUE_SOURCE_H_