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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_GROUP_H_
#define MEDIA_BUFFER_GROUP_H_
#include <media/stagefright/MediaBuffer.h>
#include <utils/Errors.h>
#include <utils/threads.h>
namespace android {
class MediaBuffer;
class MetaData;
class MediaBufferGroup : public MediaBufferObserver {
public:
MediaBufferGroup(size_t growthLimit = 0);
// create a media buffer group with preallocated buffers
MediaBufferGroup(size_t buffers, size_t buffer_size, size_t growthLimit = 0);
~MediaBufferGroup();
void add_buffer(MediaBuffer *buffer);
bool has_buffers();
// If nonBlocking is false, it blocks until a buffer is available and
// passes it to the caller in *buffer, while returning OK.
// The returned buffer will have a reference count of 1.
// If nonBlocking is true and a buffer is not immediately available,
// buffer is set to NULL and it returns WOULD_BLOCK.
// If requestedSize is 0, any free MediaBuffer will be returned.
// If requestedSize is > 0, the returned MediaBuffer should have buffer
// size of at least requstedSize.
status_t acquire_buffer(
MediaBuffer **buffer, bool nonBlocking = false, size_t requestedSize = 0);
size_t buffers() const { return mBuffers.size(); }
// If buffer is nullptr, have acquire_buffer() check for remote release.
virtual void signalBufferReturned(MediaBuffer *buffer);
private:
friend class MediaBuffer;
Mutex mLock;
Condition mCondition;
size_t mGrowthLimit; // Do not automatically grow group larger than this.
std::list<MediaBuffer *> mBuffers;
MediaBufferGroup(const MediaBufferGroup &);
MediaBufferGroup &operator=(const MediaBufferGroup &);
};
} // namespace android
#endif // MEDIA_BUFFER_GROUP_H_