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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_VIDEO_FRAME_HANDLE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_VIDEO_FRAME_HANDLE_H_
#include "base/memory/scoped_refptr.h"
#include "media/base/video_frame.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/wtf/thread_safe_ref_counted.h"
#include "third_party/blink/renderer/platform/wtf/threading_primitives.h"
namespace blink {
// Wrapper class that allows sharing a single |frame_| reference across
// multiple VideoFrames, which can be invalidated for all frames at once.
class MODULES_EXPORT VideoFrameHandle
: public WTF::ThreadSafeRefCounted<VideoFrameHandle> {
public:
explicit VideoFrameHandle(scoped_refptr<media::VideoFrame>);
// Returns a copy of |frame_|, which should be re-used throughout the scope
// of a function call, instead of calling frame() multiple times. Otherwise
// the frame could be destroyed between calls.
scoped_refptr<media::VideoFrame> frame();
// Releases the underlying media::VideoFrame reference, affecting all
// blink::VideoFrames and blink::Planes that hold a reference to |this|.
void Invalidate();
private:
friend class WTF::ThreadSafeRefCounted<VideoFrameHandle>;
~VideoFrameHandle() = default;
WTF::Mutex mutex_;
scoped_refptr<media::VideoFrame> frame_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBCODECS_VIDEO_FRAME_HANDLE_H_
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