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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_RENDERER_MEDIA_VIDEO_FRAME_PROVIDER_H_
6 #define CONTENT_RENDERER_MEDIA_VIDEO_FRAME_PROVIDER_H_
7 
8 #include "base/callback.h"
9 #include "base/memory/ref_counted.h"
10 #include "content/common/content_export.h"
11 
12 namespace media {
13 class VideoFrame;
14 }
15 
16 namespace content {
17 
18 // Define an interface to provide a sequence of video frames to clients.
19 // TODO(wjia): remove ref count.
20 // TODO(wjia): rename interface so it doesn't clash with cc::VideoFrameProvider.
21 class CONTENT_EXPORT VideoFrameProvider
22     : public base::RefCountedThreadSafe<VideoFrameProvider> {
23  public:
24   typedef base::Callback<void(const scoped_refptr<media::VideoFrame>&)>
25       RepaintCB;
26 
27   // Start to provide video frames to the caller.
28   virtual void Start() = 0;
29 
30   // Stop to provide video frames to the caller.
31   virtual void Stop() = 0;
32 
33   // Resume to provide video frames to the caller after being paused.
34   virtual void Play() = 0;
35 
36   // Put the provider in pause state and the caller will not receive video
37   // frames, but the provider might still generate video frames which are
38   // thrown away.
39   virtual void Pause() = 0;
40 
41  protected:
42   friend class base::RefCountedThreadSafe<VideoFrameProvider>;
43 
44   VideoFrameProvider();
45   virtual ~VideoFrameProvider();
46 
47  private:
48   DISALLOW_COPY_AND_ASSIGN(VideoFrameProvider);
49 };
50 
51 }  // namespace content
52 
53 #endif  // CONTENT_RENDERER_MEDIA_VIDEO_FRAME_PROVIDER_H_
54