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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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