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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef REMOTING_CAPTURER_VIDEO_FRAME_QUEUE_H_ | 5 #ifndef MEDIA_VIDEO_CAPTURE_SCREEN_SCREEN_CAPTURE_FRAME_QUEUE_H_ |
6 #define REMOTING_CAPTURER_VIDEO_FRAME_QUEUE_H_ | 6 #define MEDIA_VIDEO_CAPTURE_SCREEN_SCREEN_CAPTURE_FRAME_QUEUE_H_ |
7 | 7 |
8 #include "base/compiler_specific.h" | 8 #include "base/compiler_specific.h" |
9 #include "base/memory/scoped_ptr.h" | 9 #include "base/memory/scoped_ptr.h" |
10 | 10 |
11 namespace remoting { | 11 namespace media { |
12 | 12 |
13 class VideoFrame; | 13 class ScreenCaptureFrame; |
14 | 14 |
15 // Represents a queue of reusable video frames. Provides access to the 'current' | 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 | 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 | 17 // the 'previous' frame - the predecessor of the current frame swapped by |
18 // DoneWithCurrentFrame() call, if any. | 18 // DoneWithCurrentFrame() call, if any. |
19 // | 19 // |
20 // The caller is expected to (re)allocate frames if current_frame_needs_update() | 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, | 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 | 22 // say, frame dimensions change). The queue records which frames need updating |
23 // which the caller can query. | 23 // which the caller can query. |
24 class VideoFrameQueue { | 24 class ScreenCaptureFrameQueue { |
25 public: | 25 public: |
26 VideoFrameQueue(); | 26 ScreenCaptureFrameQueue(); |
27 ~VideoFrameQueue(); | 27 ~ScreenCaptureFrameQueue(); |
28 | 28 |
29 // Moves to the next frame in the queue, moving the 'current' frame to become | 29 // Moves to the next frame in the queue, moving the 'current' frame to become |
30 // the 'previous' one. | 30 // the 'previous' one. |
31 void DoneWithCurrentFrame(); | 31 void DoneWithCurrentFrame(); |
32 | 32 |
33 // Replaces the current frame with a new one allocated by the caller. | 33 // Replaces the current frame with a new one allocated by the caller. |
34 // The existing frame (if any) is destroyed. | 34 // The existing frame (if any) is destroyed. |
35 void ReplaceCurrentFrame(scoped_ptr<VideoFrame> frame); | 35 void ReplaceCurrentFrame(scoped_ptr<ScreenCaptureFrame> frame); |
36 | 36 |
37 // Marks all frames obsolete and resets the previous frame pointer. No | 37 // Marks all frames obsolete and resets the previous frame pointer. No |
38 // frames are freed though as the caller can still access them. | 38 // frames are freed though as the caller can still access them. |
39 void SetAllFramesNeedUpdate(); | 39 void SetAllFramesNeedUpdate(); |
40 | 40 |
41 VideoFrame* current_frame() const { | 41 ScreenCaptureFrame* current_frame() const { |
42 return frames_[current_].get(); | 42 return frames_[current_].get(); |
43 } | 43 } |
44 | 44 |
45 bool current_frame_needs_update() const { | 45 bool current_frame_needs_update() const { |
46 return !current_frame() || needs_update_[current_]; | 46 return !current_frame() || needs_update_[current_]; |
47 } | 47 } |
48 | 48 |
49 VideoFrame* previous_frame() const { return previous_; } | 49 ScreenCaptureFrame* previous_frame() const { return previous_; } |
50 | 50 |
51 private: | 51 private: |
52 // Index of the current frame. | 52 // Index of the current frame. |
53 int current_; | 53 int current_; |
54 | 54 |
55 static const int kQueueLength = 2; | 55 static const int kQueueLength = 2; |
56 scoped_ptr<VideoFrame> frames_[kQueueLength]; | 56 scoped_ptr<ScreenCaptureFrame> frames_[kQueueLength]; |
57 | 57 |
58 // True if the corresponding frame needs to be re-allocated. | 58 // True if the corresponding frame needs to be re-allocated. |
59 bool needs_update_[kQueueLength]; | 59 bool needs_update_[kQueueLength]; |
60 | 60 |
61 // Points to the previous frame if any. | 61 // Points to the previous frame if any. |
62 VideoFrame* previous_; | 62 ScreenCaptureFrame* previous_; |
63 | 63 |
64 DISALLOW_COPY_AND_ASSIGN(VideoFrameQueue); | 64 DISALLOW_COPY_AND_ASSIGN(ScreenCaptureFrameQueue); |
65 }; | 65 }; |
66 | 66 |
67 } // namespace remoting | 67 } // namespace media |
68 | 68 |
69 #endif // REMOTING_CAPTURER_VIDEO_FRAME_QUEUE_H_ | 69 #endif // MEDIA_VIDEO_CAPTURE_SCREEN_SCREEN_CAPTURE_FRAME_QUEUE_H_ |
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