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/*
* Copyright (C) 2009 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 MEDIA_BUFFER_H_
#define MEDIA_BUFFER_H_
#include <media/stagefright/foundation/MediaBufferBase.h>
#include <pthread.h>
#include <utils/Errors.h>
#include <utils/RefBase.h>
namespace android {
struct ABuffer;
class GraphicBuffer;
class MediaBuffer;
class MediaBufferObserver;
class MetaData;
class MediaBufferObserver {
public:
MediaBufferObserver() {}
virtual ~MediaBufferObserver() {}
virtual void signalBufferReturned(MediaBuffer *buffer) = 0;
private:
MediaBufferObserver(const MediaBufferObserver &);
MediaBufferObserver &operator=(const MediaBufferObserver &);
};
class MediaBuffer : public MediaBufferBase {
public:
// The underlying data remains the responsibility of the caller!
MediaBuffer(void *data, size_t size);
MediaBuffer(size_t size);
MediaBuffer(const sp<GraphicBuffer>& graphicBuffer);
MediaBuffer(const sp<ABuffer> &buffer);
// Decrements the reference count and returns the buffer to its
// associated MediaBufferGroup if the reference count drops to 0.
virtual void release();
// Increments the reference count.
virtual void add_ref();
void *data() const;
size_t size() const;
size_t range_offset() const;
size_t range_length() const;
void set_range(size_t offset, size_t length);
sp<GraphicBuffer> graphicBuffer() const;
sp<MetaData> meta_data();
// Clears meta data and resets the range to the full extent.
void reset();
void setObserver(MediaBufferObserver *group);
// Returns a clone of this MediaBuffer increasing its reference count.
// The clone references the same data but has its own range and
// MetaData.
MediaBuffer *clone();
int refcount() const;
protected:
virtual ~MediaBuffer();
private:
friend class MediaBufferGroup;
friend class OMXDecoder;
// For use by OMXDecoder, reference count must be 1, drop reference
// count to 0 without signalling the observer.
void claim();
MediaBufferObserver *mObserver;
MediaBuffer *mNextBuffer;
int mRefCount;
void *mData;
size_t mSize, mRangeOffset, mRangeLength;
sp<GraphicBuffer> mGraphicBuffer;
sp<ABuffer> mBuffer;
bool mOwnsData;
sp<MetaData> mMetaData;
MediaBuffer *mOriginal;
void setNextBuffer(MediaBuffer *buffer);
MediaBuffer *nextBuffer();
MediaBuffer(const MediaBuffer &);
MediaBuffer &operator=(const MediaBuffer &);
};
} // namespace android
#endif // MEDIA_BUFFER_H_
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