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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // Linux specific implementation of VideoCaptureDevice. | |
| 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 | |
| 8 // from V4L2. | |
| 9 | |
| 10 #ifndef MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_ | |
| 11 #define MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_ | |
| 12 | |
| 13 #include <stdint.h> | |
| 14 | |
| 15 #include <string> | |
| 16 | |
| 17 #include "base/files/file_util.h" | |
| 18 #include "base/files/scoped_file.h" | |
| 19 #include "base/macros.h" | |
| 20 #include "base/threading/thread.h" | |
| 21 #include "media/base/video_capture_types.h" | |
| 22 #include "media/capture/video/video_capture_device.h" | |
| 23 | |
| 24 namespace media { | |
| 25 | |
| 26 class V4L2CaptureDelegate; | |
| 27 | |
| 28 // Linux V4L2 implementation of VideoCaptureDevice. | |
| 29 class VideoCaptureDeviceLinux : public VideoCaptureDevice { | |
| 30 public: | |
| 31 static VideoPixelFormat V4l2FourCcToChromiumPixelFormat(uint32_t v4l2_fourcc); | |
| 32 static std::list<uint32_t> GetListOfUsableFourCCs(bool favour_mjpeg); | |
| 33 | |
| 34 explicit VideoCaptureDeviceLinux( | |
| 35 const VideoCaptureDeviceDescriptor& device_descriptor); | |
| 36 ~VideoCaptureDeviceLinux() override; | |
| 37 | |
| 38 // VideoCaptureDevice implementation. | |
| 39 void AllocateAndStart(const VideoCaptureParams& params, | |
| 40 std::unique_ptr<Client> client) override; | |
| 41 void StopAndDeAllocate() override; | |
| 42 | |
| 43 protected: | |
| 44 void SetRotation(int rotation); | |
| 45 | |
| 46 private: | |
| 47 static int TranslatePowerLineFrequencyToV4L2(PowerLineFrequency frequency); | |
| 48 | |
| 49 // Internal delegate doing the actual capture setting, buffer allocation and | |
| 50 // circulation with the V4L2 API. Created and deleted in the thread where | |
| 51 // VideoCaptureDeviceLinux lives but otherwise operating on |v4l2_thread_|. | |
| 52 scoped_refptr<V4L2CaptureDelegate> capture_impl_; | |
| 53 | |
| 54 base::Thread v4l2_thread_; // Thread used for reading data from the device. | |
| 55 | |
| 56 const VideoCaptureDeviceDescriptor device_descriptor_; | |
| 57 | |
| 58 DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux); | |
| 59 }; | |
| 60 | |
| 61 } // namespace media | |
| 62 | |
| 63 #endif // MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_ | |
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Chromium Code Reviews
Issue 2214533002:
move //media/capture to //device/capture (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master