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