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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 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 // VideoRendererBase creates its own thread for the sole purpose of timing frame | 5 // VideoRendererBase creates its own thread for the sole purpose of timing frame |
| 6 // presentation. It handles reading from the decoder and stores the results in | 6 // presentation. It handles reading from the decoder and stores the results in |
| 7 // a queue of decoded frames, calling OnFrameAvailable() on subclasses to notify | 7 // a queue of decoded frames, calling OnFrameAvailable() on subclasses to notify |
| 8 // when a frame is ready to display. | 8 // when a frame is ready to display. |
| 9 // | 9 // |
| 10 // The media filter methods Initialize(), Stop(), SetPlaybackRate() and Seek() | 10 // The media filter methods Initialize(), Stop(), SetPlaybackRate() and Seek() |
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| 87 // | 87 // |
| 88 // Implementors should avoid doing any sort of heavy work in this method and | 88 // Implementors should avoid doing any sort of heavy work in this method and |
| 89 // instead post a task to a common/worker thread to handle rendering. Slowing | 89 // instead post a task to a common/worker thread to handle rendering. Slowing |
| 90 // down the video thread may result in losing synchronization with audio. | 90 // down the video thread may result in losing synchronization with audio. |
| 91 // | 91 // |
| 92 // IMPORTANT: This method is called on the video renderer thread, which is | 92 // IMPORTANT: This method is called on the video renderer thread, which is |
| 93 // different from the thread OnInitialize(), OnStop(), and the rest of the | 93 // different from the thread OnInitialize(), OnStop(), and the rest of the |
| 94 // class executes on. | 94 // class executes on. |
| 95 virtual void OnFrameAvailable() = 0; | 95 virtual void OnFrameAvailable() = 0; |
| 96 | 96 |
| 97 virtual VideoDecoder* GetDecoder() { | 97 virtual VideoDecoder* GetDecoder(); |
| 98 return decoder_.get(); | |
| 99 } | |
| 100 | 98 |
| 101 int width() { return width_; } | 99 int width() { return width_; } |
| 102 int height() { return height_; } | 100 int height() { return height_; } |
| 103 VideoFrame::Format surface_format() { return surface_format_; } | 101 VideoFrame::Format surface_format() { return surface_format_; } |
| 104 VideoFrame::SurfaceType surface_type() { return surface_type_; } | 102 VideoFrame::SurfaceType surface_type() { return surface_type_; } |
| 105 | 103 |
| 106 void ReadInput(scoped_refptr<VideoFrame> frame); | 104 void ReadInput(scoped_refptr<VideoFrame> frame); |
| 107 | 105 |
| 108 private: | 106 private: |
| 109 // Callback from video decoder to deliver decoded video frames and decrements | 107 // Callback from video decoder to deliver decoded video frames and decrements |
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| 210 scoped_ptr<FilterCallback> seek_callback_; | 208 scoped_ptr<FilterCallback> seek_callback_; |
| 211 | 209 |
| 212 base::TimeDelta seek_timestamp_; | 210 base::TimeDelta seek_timestamp_; |
| 213 | 211 |
| 214 DISALLOW_COPY_AND_ASSIGN(VideoRendererBase); | 212 DISALLOW_COPY_AND_ASSIGN(VideoRendererBase); |
| 215 }; | 213 }; |
| 216 | 214 |
| 217 } // namespace media | 215 } // namespace media |
| 218 | 216 |
| 219 #endif // MEDIA_FILTERS_VIDEO_RENDERER_BASE_H_ | 217 #endif // MEDIA_FILTERS_VIDEO_RENDERER_BASE_H_ |
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