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Side by Side Diff: remoting/host/video_frame_queue.h

Issue 11470028: Move screen capturers to remoting/capturer. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 8 years ago
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1 // Copyright (c) 2012 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 REMOTING_HOST_VIDEO_FRAME_QUEUE_H_
6 #define REMOTING_HOST_VIDEO_FRAME_QUEUE_H_
7
8 #include "base/compiler_specific.h"
9 #include "base/memory/scoped_ptr.h"
10
11 namespace remoting {
12
13 class VideoFrame;
14
15 // Represents a queue of reusable video frames. Provides access to the 'current'
16 // frame - the frame that the caller is working with at the moment, and to
17 // the 'previous' frame - the predecessor of the current frame swapped by
18 // DoneWithCurrentFrame() call, if any.
19 //
20 // The caller is expected to (re)allocate frames if current_frame_needs_update()
21 // is set. The caller can mark all frames in the queue for reallocation (when,
22 // say, frame dimensions change). The queue records which frames need updating
23 // which the caller can query.
24 class VideoFrameQueue {
25 public:
26 VideoFrameQueue();
27 ~VideoFrameQueue();
28
29 // Moves to the next frame in the queue, moving the 'current' frame to become
30 // the 'previous' one.
31 void DoneWithCurrentFrame();
32
33 // Replaces the current frame with a new one allocated by the caller.
34 // The existing frame (if any) is destroyed.
35 void ReplaceCurrentFrame(scoped_ptr<VideoFrame> frame);
36
37 // Marks all frames obsolete and resets the previous frame pointer. No
38 // frames are freed though as the caller can still access them.
39 void SetAllFramesNeedUpdate();
40
41 VideoFrame* current_frame() const {
42 return frames_[current_].get();
43 }
44
45 bool current_frame_needs_update() const {
46 return !current_frame() || needs_update_[current_];
47 }
48
49 VideoFrame* previous_frame() const { return previous_; }
50
51 private:
52 // Index of the current frame.
53 int current_;
54
55 static const int kQueueLength = 2;
56 scoped_ptr<VideoFrame> frames_[kQueueLength];
57
58 // True if the corresponding frame needs to be re-allocated.
59 bool needs_update_[kQueueLength];
60
61 // Points to the previous frame if any.
62 VideoFrame* previous_;
63
64 DISALLOW_COPY_AND_ASSIGN(VideoFrameQueue);
65 };
66
67 } // namespace remoting
68
69 #endif // REMOTING_HOST_VIDEO_FRAME_QUEUE_H_
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