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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_BASE_VIDEO_FRAME_POOL_H_
#define MEDIA_BASE_VIDEO_FRAME_POOL_H_
#include <stddef.h>
#include "media/base/media_export.h"
#include "media/base/video_frame.h"
namespace base {
class TickClock;
}
namespace media {
// Simple VideoFrame pool used to avoid unnecessarily allocating and destroying
// VideoFrame objects. The pool manages the memory for the VideoFrame
// returned by CreateFrame(). When one of these VideoFrames is destroyed,
// the memory is returned to the pool for use by a subsequent CreateFrame()
// call. The memory in the pool is retained for the life of the
// VideoFramePool object. If the parameters passed to CreateFrame() change
// during the life of this object, then the memory used by frames with the old
// parameter values will be purged from the pool.
class MEDIA_EXPORT VideoFramePool {
public:
VideoFramePool();
VideoFramePool(const VideoFramePool&) = delete;
VideoFramePool& operator=(const VideoFramePool&) = delete;
~VideoFramePool();
// Returns a frame from the pool that matches the specified
// parameters or creates a new frame if no suitable frame exists in
// the pool. The pool is drained if no matching frame is found.
// The buffer for the new frame will be zero initialized. Reused frames will
// not be zero initialized.
scoped_refptr<VideoFrame> CreateFrame(VideoPixelFormat format,
const gfx::Size& coded_size,
const gfx::Rect& visible_rect,
const gfx::Size& natural_size,
base::TimeDelta timestamp);
protected:
friend class VideoFramePoolTest;
// Returns the number of frames in the pool for testing purposes.
size_t GetPoolSizeForTesting() const;
// Allows injection of a base::SimpleTestClock for testing.
void SetTickClockForTesting(const base::TickClock* tick_clock);
private:
class PoolImpl;
scoped_refptr<PoolImpl> pool_;
};
} // namespace media
#endif // MEDIA_BASE_VIDEO_FRAME_POOL_H_
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