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Side by Side Diff: content/renderer/media/video_frame_compositor.h

Issue 495353003: Move WebMediaPlayerImpl and its dependencies to media/blink. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: . Created 6 years, 3 months ago
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1 // Copyright 2014 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_COMPOSITOR_H_
6 #define CONTENT_RENDERER_MEDIA_VIDEO_FRAME_COMPOSITOR_H_
7
8 #include "base/callback.h"
9 #include "base/memory/ref_counted.h"
10 #include "cc/layers/video_frame_provider.h"
11 #include "content/common/content_export.h"
12 #include "ui/gfx/size.h"
13
14 namespace media {
15 class VideoFrame;
16 }
17
18 namespace content {
19
20 // VideoFrameCompositor handles incoming frames by notifying the compositor and
21 // dispatching callbacks when detecting changes in video frames.
22 //
23 // Typical usage is to deliver ready-to-be-displayed video frames to
24 // UpdateCurrentFrame() so that VideoFrameCompositor can take care of tracking
25 // changes in video frames and firing callbacks as needed.
26 //
27 // VideoFrameCompositor must live on the same thread as the compositor.
28 class CONTENT_EXPORT VideoFrameCompositor
29 : NON_EXPORTED_BASE(public cc::VideoFrameProvider) {
30 public:
31 // |natural_size_changed_cb| is run with the new natural size of the video
32 // frame whenever a change in natural size is detected. It is not called the
33 // first time UpdateCurrentFrame() is called. Run on the same thread as the
34 // caller of UpdateCurrentFrame().
35 //
36 // |opacity_changed_cb| is run when a change in opacity is detected. It *is*
37 // called the first time UpdateCurrentFrame() is called. Run on the same
38 // thread as the caller of UpdateCurrentFrame().
39 //
40 // TODO(scherkus): Investigate the inconsistency between the callbacks with
41 // respect to why we don't call |natural_size_changed_cb| on the first frame.
42 // I suspect it was for historical reasons that no longer make sense.
43 VideoFrameCompositor(
44 const base::Callback<void(gfx::Size)>& natural_size_changed_cb,
45 const base::Callback<void(bool)>& opacity_changed_cb);
46 virtual ~VideoFrameCompositor();
47
48 // cc::VideoFrameProvider implementation.
49 virtual void SetVideoFrameProviderClient(
50 cc::VideoFrameProvider::Client* client) OVERRIDE;
51 virtual scoped_refptr<media::VideoFrame> GetCurrentFrame() OVERRIDE;
52 virtual void PutCurrentFrame(
53 const scoped_refptr<media::VideoFrame>& frame) OVERRIDE;
54
55 // Updates the current frame and notifies the compositor.
56 void UpdateCurrentFrame(const scoped_refptr<media::VideoFrame>& frame);
57
58 private:
59 base::Callback<void(gfx::Size)> natural_size_changed_cb_;
60 base::Callback<void(bool)> opacity_changed_cb_;
61
62 cc::VideoFrameProvider::Client* client_;
63
64 scoped_refptr<media::VideoFrame> current_frame_;
65
66 DISALLOW_COPY_AND_ASSIGN(VideoFrameCompositor);
67 };
68
69 } // namespace content
70
71 #endif // CONTENT_RENDERER_MEDIA_VIDEO_FRAME_COMPOSITOR_H_
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