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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 // Linux specific implementation of VideoCaptureDevice. | 5 // Linux specific implementation of VideoCaptureDevice. |
| 6 // V4L2 is used for capturing. V4L2 does not provide its own thread for | 6 // V4L2 is used for capturing. V4L2 does not provide its own thread for |
| 7 // capturing so this implementation uses a Chromium thread for fetching frames | 7 // capturing so this implementation uses a Chromium thread for fetching frames |
| 8 // from V4L2. | 8 // from V4L2. |
| 9 | 9 |
| 10 #ifndef MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_ | 10 #ifndef MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_ |
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| 24 namespace media { | 24 namespace media { |
| 25 | 25 |
| 26 class V4L2CaptureDelegate; | 26 class V4L2CaptureDelegate; |
| 27 | 27 |
| 28 // Linux V4L2 implementation of VideoCaptureDevice. | 28 // Linux V4L2 implementation of VideoCaptureDevice. |
| 29 class VideoCaptureDeviceLinux : public VideoCaptureDevice { | 29 class VideoCaptureDeviceLinux : public VideoCaptureDevice { |
| 30 public: | 30 public: |
| 31 static VideoPixelFormat V4l2FourCcToChromiumPixelFormat(uint32_t v4l2_fourcc); | 31 static VideoPixelFormat V4l2FourCcToChromiumPixelFormat(uint32_t v4l2_fourcc); |
| 32 static std::list<uint32_t> GetListOfUsableFourCCs(bool favour_mjpeg); | 32 static std::list<uint32_t> GetListOfUsableFourCCs(bool favour_mjpeg); |
| 33 | 33 |
| 34 explicit VideoCaptureDeviceLinux(const Name& device_name); | 34 explicit VideoCaptureDeviceLinux( |
| 35 const VideoCaptureDeviceDescriptor& device_descriptor); |
| 35 ~VideoCaptureDeviceLinux() override; | 36 ~VideoCaptureDeviceLinux() override; |
| 36 | 37 |
| 37 // VideoCaptureDevice implementation. | 38 // VideoCaptureDevice implementation. |
| 38 void AllocateAndStart(const VideoCaptureParams& params, | 39 void AllocateAndStart(const VideoCaptureParams& params, |
| 39 std::unique_ptr<Client> client) override; | 40 std::unique_ptr<Client> client) override; |
| 40 void StopAndDeAllocate() override; | 41 void StopAndDeAllocate() override; |
| 41 | 42 |
| 42 protected: | 43 protected: |
| 43 void SetRotation(int rotation); | 44 void SetRotation(int rotation); |
| 44 | 45 |
| 45 private: | 46 private: |
| 46 static int TranslatePowerLineFrequencyToV4L2(PowerLineFrequency frequency); | 47 static int TranslatePowerLineFrequencyToV4L2(PowerLineFrequency frequency); |
| 47 | 48 |
| 48 // Internal delegate doing the actual capture setting, buffer allocation and | 49 // Internal delegate doing the actual capture setting, buffer allocation and |
| 49 // circulation with the V4L2 API. Created and deleted in the thread where | 50 // circulation with the V4L2 API. Created and deleted in the thread where |
| 50 // VideoCaptureDeviceLinux lives but otherwise operating on |v4l2_thread_|. | 51 // VideoCaptureDeviceLinux lives but otherwise operating on |v4l2_thread_|. |
| 51 scoped_refptr<V4L2CaptureDelegate> capture_impl_; | 52 scoped_refptr<V4L2CaptureDelegate> capture_impl_; |
| 52 | 53 |
| 53 base::Thread v4l2_thread_; // Thread used for reading data from the device. | 54 base::Thread v4l2_thread_; // Thread used for reading data from the device. |
| 54 | 55 |
| 55 const Name device_name_; | 56 const VideoCaptureDeviceDescriptor device_descriptor_; |
| 56 | 57 |
| 57 DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux); | 58 DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux); |
| 58 }; | 59 }; |
| 59 | 60 |
| 60 } // namespace media | 61 } // namespace media |
| 61 | 62 |
| 62 #endif // MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_ | 63 #endif // MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_ |
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