content/public/renderer/video_frame_provider.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_PUBLIC_RENDERER_VIDEO_FRAME_PROVIDER_H_
   6 #define CONTENT_PUBLIC_RENDERER_VIDEO_FRAME_PROVIDER_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/ref_counted.h"
  10
  11 namespace media {
  12 class VideoFrame;
  13 }
  14
  15 namespace content {
  16
  17 // Define an interface to provide a sequence of video frames to clients.
  18 // TODO(wjia): remove ref count.
  19 // TODO(wjia): rename interface so it doesn't clash with cc::VideoFrameProvider.
  20 class VideoFrameProvider
  21     : public base::RefCountedThreadSafe<VideoFrameProvider> {
  22  public:
  23   typedef base::Callback<void(const scoped_refptr<media::VideoFrame>&)>
  24       RepaintCB;
  25
  26   // Start to provide video frames to the caller.
  27   virtual void Start() = 0;
  28
  29   // Stop to provide video frames to the caller.
  30   virtual void Stop() = 0;
  31
  32   // Resume to provide video frames to the caller after being paused.
  33   virtual void Play() = 0;
  34
  35   // Put the provider in pause state and the caller will not receive video
  36   // frames, but the provider might still generate video frames which are
  37   // thrown away.
  38   virtual void Pause() = 0;
  39
  40  protected:
  41   friend class base::RefCountedThreadSafe<VideoFrameProvider>;
  42
  43   virtual ~VideoFrameProvider() {}
  44
  45 };
  46
  47 }  // namespace content
  48
  49 #endif  // CONTENT_PUBLIC_RENDERER_VIDEO_FRAME_PROVIDER_H_