| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Linux specific implementation of VideoCaptureDevice. |
| // V4L2 is used for capturing. V4L2 does not provide its own thread for |
| // capturing so this implementation uses a Chromium thread for fetching frames |
| // from V4L2. |
| |
| #ifndef MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_ |
| #define MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_ |
| |
| #include <stdint.h> |
| |
| #include <memory> |
| #include <vector> |
| |
| #include "base/files/file_util.h" |
| #include "base/files/scoped_file.h" |
| #include "base/macros.h" |
| #include "base/threading/thread.h" |
| #include "media/capture/video/linux/v4l2_capture_device_impl.h" |
| #include "media/capture/video/video_capture_device.h" |
| #include "media/capture/video_capture_types.h" |
| |
| namespace media { |
| |
| class V4L2CaptureDelegate; |
| |
| // Linux V4L2 implementation of VideoCaptureDevice. |
| class VideoCaptureDeviceLinux : public VideoCaptureDevice { |
| public: |
| static VideoPixelFormat V4l2FourCcToChromiumPixelFormat(uint32_t v4l2_fourcc); |
| static std::vector<uint32_t> GetListOfUsableFourCCs(bool favour_mjpeg); |
| |
| explicit VideoCaptureDeviceLinux( |
| scoped_refptr<V4L2CaptureDevice> v4l2, |
| const VideoCaptureDeviceDescriptor& device_descriptor); |
| ~VideoCaptureDeviceLinux() override; |
| |
| // VideoCaptureDevice implementation. |
| void AllocateAndStart(const VideoCaptureParams& params, |
| std::unique_ptr<Client> client) override; |
| void StopAndDeAllocate() override; |
| void TakePhoto(TakePhotoCallback callback) override; |
| void GetPhotoState(GetPhotoStateCallback callback) override; |
| void SetPhotoOptions(mojom::PhotoSettingsPtr settings, |
| SetPhotoOptionsCallback callback) override; |
| |
| protected: |
| virtual void SetRotation(int rotation); |
| |
| const VideoCaptureDeviceDescriptor device_descriptor_; |
| |
| private: |
| const scoped_refptr<V4L2CaptureDevice> v4l2_; |
| |
| // Internal delegate doing the actual capture setting, buffer allocation and |
| // circulation with the V4L2 API. Created in the thread where |
| // VideoCaptureDeviceLinux lives but otherwise operating and deleted on |
| // |v4l2_thread_|. |
| std::unique_ptr<V4L2CaptureDelegate> capture_impl_; |
| |
| // Photo-related requests waiting for |v4l2_thread_| to be active. |
| std::vector<base::OnceClosure> photo_requests_queue_; |
| |
| base::Thread v4l2_thread_; // Thread used for reading data from the device. |
| |
| // SetRotation() may get called even when the device is not started. When that |
| // is the case we remember the value here and use it as soon as the device |
| // gets started. |
| int rotation_; |
| |
| SEQUENCE_CHECKER(sequence_checker_); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux); |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_ |