chromium/src/third_party/blink/renderer/core/html/media/video_frame_callback_requester.h

// Copyright 2019 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_CORE_HTML_MEDIA_VIDEO_FRAME_CALLBACK_REQUESTER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_MEDIA_VIDEO_FRAME_CALLBACK_REQUESTER_H_

#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/supplementable.h"

namespace blink {

class HTMLVideoElement;

// Interface defining what the HTMLVideoElement should be aware
// of in order to support the <video>.requestVideoFrameCallback() API.
class CORE_EXPORT VideoFrameCallbackRequester
    : public GarbageCollected<VideoFrameCallbackRequester>,
      public Supplement<HTMLVideoElement> {
 public:
  static const char kSupplementName[];

  static VideoFrameCallbackRequester* From(HTMLVideoElement&);

  virtual ~VideoFrameCallbackRequester() = default;

  void Trace(Visitor*) const override;

  virtual void OnWebMediaPlayerCreated() = 0;
  virtual void OnWebMediaPlayerCleared() = 0;
  virtual void OnRequestVideoFrameCallback() = 0;

 protected:
  explicit VideoFrameCallbackRequester(HTMLVideoElement&);
  DISALLOW_COPY_AND_ASSIGN(VideoFrameCallbackRequester);
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_MEDIA_VIDEO_FRAME_CALLBACK_REQUESTER_H_