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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. |
11 | 11 |
12 #ifndef MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_H_ | 12 #ifndef MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_H_ |
13 #define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_H_ | 13 #define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_H_ |
14 | 14 |
15 #include <list> | 15 #include <list> |
16 #include <string> | 16 #include <string> |
17 | 17 |
18 #include "base/logging.h" | 18 #include "base/logging.h" |
19 #include "base/memory/ref_counted.h" | 19 #include "base/memory/ref_counted.h" |
20 #include "base/memory/scoped_ptr.h" | 20 #include "base/memory/scoped_ptr.h" |
21 #include "base/time/time.h" | 21 #include "base/time/time.h" |
22 #include "media/base/media_export.h" | 22 #include "media/base/media_export.h" |
| 23 #include "media/base/video_frame.h" |
23 #include "media/video/capture/video_capture_types.h" | 24 #include "media/video/capture/video_capture_types.h" |
24 | 25 |
25 namespace media { | 26 namespace media { |
26 | 27 |
27 class MEDIA_EXPORT VideoCaptureDevice { | 28 class MEDIA_EXPORT VideoCaptureDevice { |
28 public: | 29 public: |
29 // Represents a capture device name and ID. | 30 // Represents a capture device name and ID. |
30 // You should not create an instance of this class directly by e.g. setting | 31 // You should not create an instance of this class directly by e.g. setting |
31 // various properties directly. Instead use | 32 // various properties directly. Instead use |
32 // VideoCaptureDevice::GetDeviceNames to do this for you and if you need to | 33 // VideoCaptureDevice::GetDeviceNames to do this for you and if you need to |
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165 // This method will try to reserve an output buffer and copy from |data| | 166 // This method will try to reserve an output buffer and copy from |data| |
166 // into the output buffer. If no output buffer is available, the frame will | 167 // into the output buffer. If no output buffer is available, the frame will |
167 // be silently dropped. | 168 // be silently dropped. |
168 virtual void OnIncomingCapturedFrame( | 169 virtual void OnIncomingCapturedFrame( |
169 const uint8* data, | 170 const uint8* data, |
170 int length, | 171 int length, |
171 base::Time timestamp, | 172 base::Time timestamp, |
172 int rotation, // Clockwise. | 173 int rotation, // Clockwise. |
173 bool flip_vert, | 174 bool flip_vert, |
174 bool flip_horiz, | 175 bool flip_horiz, |
175 const VideoCaptureCapability& frame_info) = 0; | 176 const VideoCaptureFormat& frame_format) = 0; |
176 | 177 |
177 // Captured a new video frame, held in |buffer|. | 178 // Captured a new video frame, held in |buffer|. |
178 // | 179 // |
179 // As the frame is backed by a reservation returned by | 180 // As the frame is backed by a reservation returned by |
180 // ReserveOutputBuffer(), delivery is guaranteed and will require no | 181 // ReserveOutputBuffer(), delivery is guaranteed and will require no |
181 // additional copies in the browser process. |dimensions| indicates the | 182 // additional copies in the browser process. |dimensions| indicates the |
182 // frame width and height of the buffer contents; this is assumed to be of | 183 // frame width and height of the buffer contents; this is assumed to be of |
183 // |format| format and tightly packed. | 184 // |format| format and tightly packed. |
184 virtual void OnIncomingCapturedBuffer(const scoped_refptr<Buffer>& buffer, | 185 virtual void OnIncomingCapturedBuffer(const scoped_refptr<Buffer>& buffer, |
185 media::VideoFrame::Format format, | 186 media::VideoFrame::Format format, |
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201 static void GetDeviceNames(Names* device_names); | 202 static void GetDeviceNames(Names* device_names); |
202 | 203 |
203 // Gets the capabilities of a particular device attached to the system. This | 204 // Gets the capabilities of a particular device attached to the system. This |
204 // method should be called before allocating or starting a device. In case | 205 // method should be called before allocating or starting a device. In case |
205 // format enumeration is not supported, or there was a problem, the formats | 206 // format enumeration is not supported, or there was a problem, the formats |
206 // array will be empty. | 207 // array will be empty. |
207 static void GetDeviceSupportedFormats(const Name& device, | 208 static void GetDeviceSupportedFormats(const Name& device, |
208 VideoCaptureCapabilities* formats); | 209 VideoCaptureCapabilities* formats); |
209 | 210 |
210 // Prepare the camera for use. After this function has been called no other | 211 // Prepare the camera for use. After this function has been called no other |
211 // applications can use the camera. On completion Client::OnFrameInfo() | 212 // applications can use the camera. StopAndDeAllocate() must be called before |
212 // is called informing of the resulting resolution and frame rate. | 213 // the object is deleted. |
213 // StopAndDeAllocate() must be called before the object is deleted. | 214 virtual void AllocateAndStart(const VideoCaptureParams& params, |
214 virtual void AllocateAndStart( | 215 scoped_ptr<Client> client) = 0; |
215 const VideoCaptureCapability& capture_format, | |
216 scoped_ptr<Client> client) = 0; | |
217 | 216 |
218 // Deallocates the camera, possibly asynchronously. | 217 // Deallocates the camera, possibly asynchronously. |
219 // | 218 // |
220 // This call requires the device to do the following things, eventually: put | 219 // This call requires the device to do the following things, eventually: put |
221 // camera hardware into a state where other applications could use it, free | 220 // camera hardware into a state where other applications could use it, free |
222 // the memory associated with capture, and delete the |client| pointer passed | 221 // the memory associated with capture, and delete the |client| pointer passed |
223 // into AllocateAndStart. | 222 // into AllocateAndStart. |
224 // | 223 // |
225 // If deallocation is done asynchronously, then the device implementation must | 224 // If deallocation is done asynchronously, then the device implementation must |
226 // ensure that a subsequent AllocateAndStart() operation targeting the same ID | 225 // ensure that a subsequent AllocateAndStart() operation targeting the same ID |
227 // would be sequenced through the same task runner, so that deallocation | 226 // would be sequenced through the same task runner, so that deallocation |
228 // happens first. | 227 // happens first. |
229 virtual void StopAndDeAllocate() = 0; | 228 virtual void StopAndDeAllocate() = 0; |
230 }; | 229 }; |
231 | 230 |
232 } // namespace media | 231 } // namespace media |
233 | 232 |
234 #endif // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_H_ | 233 #endif // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_H_ |
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