src/cobalt/dom/html_video_element.h

/*
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * 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 COBALT_DOM_HTML_VIDEO_ELEMENT_H_
#define COBALT_DOM_HTML_VIDEO_ELEMENT_H_

#include <string>

#include "cobalt/dom/html_media_element.h"
#include "cobalt/dom/video_playback_quality.h"
#include "media/base/shell_video_frame_provider.h"

namespace cobalt {
namespace dom {

// The HTMLVideoElement is used to play videos.
//   https://www.w3.org/TR/html5/embedded-content-0.html#the-video-element
class HTMLVideoElement : public HTMLMediaElement {
 public:
  typedef ::media::ShellVideoFrameProvider ShellVideoFrameProvider;

  static const char kTagName[];

  explicit HTMLVideoElement(Document* document);

  // Web API: HTMLVideoElement
  //
  uint32 width() const;
  uint32 height() const;
  void set_width(uint32 width);
  void set_height(uint32 height);
  uint32 video_width() const;
  uint32 video_height() const;
  scoped_refptr<VideoPlaybackQuality> GetVideoPlaybackQuality() const;

  // Custom, not in any spec
  //
  // From HTMLElement
  scoped_refptr<HTMLVideoElement> AsHTMLVideoElement() OVERRIDE { return this; }

  // TODO: ShellVideoFrameProvider is guaranteed to be long live and
  // thread safe. However, it is actually a singleton internally. We should find
  // a better way to support concurrent video playbacks.
  scoped_refptr<ShellVideoFrameProvider> GetVideoFrameProvider();

  DEFINE_WRAPPABLE_TYPE(HTMLVideoElement);

 private:
  // Thread checker ensures that HTMLMediaElement::GetVideoFrameProvider() is
  // only called from the thread that the HTMLMediaElement is created in.
  base::ThreadChecker thread_checker_;

  DISALLOW_COPY_AND_ASSIGN(HTMLVideoElement);
};

}  // namespace dom
}  // namespace cobalt

#endif  // COBALT_DOM_HTML_VIDEO_ELEMENT_H_