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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 // VideoCaptureDevice is the abstract base class for realizing video capture | 5 // VideoCaptureDevice is the abstract base class for realizing video capture |
| 6 // device support in Chromium. It provides the interface for OS dependent | 6 // device support in Chromium. It provides the interface for OS dependent |
| 7 // implementations. | 7 // implementations. |
| 8 // The class is created and functions are invoked on a thread owned by | 8 // The class is created and functions are invoked on a thread owned by |
| 9 // VideoCaptureManager. Capturing is done on other threads, depending on the OS | 9 // VideoCaptureManager. Capturing is done on other threads, depending on the OS |
| 10 // specific implementation. | 10 // specific implementation. |
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| 34 #include "media/capture/video_capture_types.h" | 34 #include "media/capture/video_capture_types.h" |
| 35 #include "mojo/public/cpp/bindings/array.h" | 35 #include "mojo/public/cpp/bindings/array.h" |
| 36 #include "ui/gfx/gpu_memory_buffer.h" | 36 #include "ui/gfx/gpu_memory_buffer.h" |
| 37 | 37 |
| 38 namespace tracked_objects { | 38 namespace tracked_objects { |
| 39 class Location; | 39 class Location; |
| 40 } // namespace tracked_objects | 40 } // namespace tracked_objects |
| 41 | 41 |
| 42 namespace media { | 42 namespace media { |
| 43 | 43 |
| 44 class CAPTURE_EXPORT FrameBufferPool { | |
| 45 public: | |
| 46 virtual ~FrameBufferPool() {} | |
| 47 | |
| 48 virtual void SetBufferHold(int buffer_id) = 0; | |
| 49 virtual void ReleaseBufferHold(int buffer_id) = 0; | |
| 50 virtual mojo::ScopedSharedBufferHandle GetHandleForTransit(int buffer_id) = 0; | |
| 51 }; | |
| 52 | |
| 53 class CAPTURE_EXPORT VideoFrameConsumerFeedbackObserver { | 44 class CAPTURE_EXPORT VideoFrameConsumerFeedbackObserver { |
| 54 public: | 45 public: |
| 55 virtual ~VideoFrameConsumerFeedbackObserver() {} | 46 virtual ~VideoFrameConsumerFeedbackObserver() {} |
| 56 | 47 |
| 57 // During processing of a video frame, consumers may report back their | 48 // During processing of a video frame, consumers may report back their |
| 58 // utilization level to the source device. The device may use this information | 49 // utilization level to the source device. The device may use this information |
| 59 // to adjust the rate of data it pushes out. Values are interpreted as | 50 // to adjust the rate of data it pushes out. Values are interpreted as |
| 60 // follows: | 51 // follows: |
| 61 // Less than 0.0 is meaningless and should be ignored. 1.0 indicates a | 52 // Less than 0.0 is meaningless and should be ignored. 1.0 indicates a |
| 62 // maximum sustainable utilization. Greater than 1.0 indicates the consumer | 53 // maximum sustainable utilization. Greater than 1.0 indicates the consumer |
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| 150 // Captured new video data, held in |frame| or |buffer|, respectively for | 141 // Captured new video data, held in |frame| or |buffer|, respectively for |
| 151 // OnIncomingCapturedVideoFrame() and OnIncomingCapturedBuffer(). | 142 // OnIncomingCapturedVideoFrame() and OnIncomingCapturedBuffer(). |
| 152 // | 143 // |
| 153 // In both cases, as the frame is backed by a reservation returned by | 144 // In both cases, as the frame is backed by a reservation returned by |
| 154 // ReserveOutputBuffer(), delivery is guaranteed and will require no | 145 // ReserveOutputBuffer(), delivery is guaranteed and will require no |
| 155 // additional copies in the browser process. | 146 // additional copies in the browser process. |
| 156 // See OnIncomingCapturedData for details of |reference_time| and | 147 // See OnIncomingCapturedData for details of |reference_time| and |
| 157 // |timestamp|. | 148 // |timestamp|. |
| 158 // TODO(chfremer): Consider removing one of the two in order to simplify the | 149 // TODO(chfremer): Consider removing one of the two in order to simplify the |
| 159 // interface. | 150 // interface. |
| 160 virtual void OnIncomingCapturedBuffer(std::unique_ptr<Buffer> buffer, | 151 virtual void OnIncomingCapturedBuffer( |
| 161 const VideoCaptureFormat& format, | 152 std::unique_ptr<Buffer> buffer, |
| 162 base::TimeTicks reference_time, | 153 const VideoCaptureFormat& frame_format, |
| 163 base::TimeDelta timestamp) = 0; | 154 base::TimeTicks reference_time, |
| 155 base::TimeDelta timestamp) = 0; |
| 164 virtual void OnIncomingCapturedVideoFrame( | 156 virtual void OnIncomingCapturedVideoFrame( |
| 165 std::unique_ptr<Buffer> buffer, | 157 std::unique_ptr<Buffer> buffer, |
| 166 scoped_refptr<VideoFrame> frame) = 0; | 158 scoped_refptr<VideoFrame> frame) = 0; |
| 167 | 159 |
| 168 // Attempts to reserve the same Buffer provided in the last call to one of | 160 // Attempts to reserve the same Buffer provided in the last call to one of |
| 169 // the OnIncomingCapturedXXX() methods. This will fail if the content of the | 161 // the OnIncomingCapturedXXX() methods. This will fail if the content of the |
| 170 // Buffer has not been preserved, or if the |dimensions|, |format|, or | 162 // Buffer has not been preserved, or if the |dimensions|, |format|, or |
| 171 // |storage| disagree with how it was reserved via ReserveOutputBuffer(). | 163 // |storage| disagree with how it was reserved via ReserveOutputBuffer(). |
| 172 // When this operation fails, nullptr will be returned. | 164 // When this operation fails, nullptr will be returned. |
| 173 virtual std::unique_ptr<Buffer> ResurrectLastOutputBuffer( | 165 virtual std::unique_ptr<Buffer> ResurrectLastOutputBuffer( |
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| 275 | 267 |
| 276 private: | 268 private: |
| 277 // Gets the power line frequency from the current system time zone if this is | 269 // Gets the power line frequency from the current system time zone if this is |
| 278 // defined, otherwise returns 0. | 270 // defined, otherwise returns 0. |
| 279 PowerLineFrequency GetPowerLineFrequencyForLocation() const; | 271 PowerLineFrequency GetPowerLineFrequencyForLocation() const; |
| 280 }; | 272 }; |
| 281 | 273 |
| 282 } // namespace media | 274 } // namespace media |
| 283 | 275 |
| 284 #endif // MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_DEVICE_H_ | 276 #endif // MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_DEVICE_H_ |
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