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.
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
10 #ifndef MEDIA_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_
11 #define MEDIA_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_
15 #include "base/files/file_util.h"
16 #include "base/files/scoped_file.h"
17 #include "base/threading/thread.h"
18 #include "media/video/capture/video_capture_device.h"
19 #include "media/video/capture/video_capture_types.h"
23 // Linux V4L2 implementation of VideoCaptureDevice.
24 class VideoCaptureDeviceLinux
: public VideoCaptureDevice
{
26 static VideoPixelFormat
V4l2FourCcToChromiumPixelFormat(uint32 v4l2_fourcc
);
27 static std::list
<int> GetListOfUsableFourCCs(bool favour_mjpeg
);
29 explicit VideoCaptureDeviceLinux(const Name
& device_name
);
30 ~VideoCaptureDeviceLinux() override
;
32 // VideoCaptureDevice implementation.
33 void AllocateAndStart(const VideoCaptureParams
& params
,
34 scoped_ptr
<Client
> client
) override
;
35 void StopAndDeAllocate() override
;
38 void SetRotation(int rotation
);
41 // Internal delegate doing the actual capture setting, buffer allocation and
42 // circulacion with the V4L2 API. Created and deleted in the thread where
43 // VideoCaptureDeviceLinux lives but otherwise operating on |v4l2_thread_|.
44 class V4L2CaptureDelegate
;
45 scoped_refptr
<V4L2CaptureDelegate
> capture_impl_
;
47 base::Thread v4l2_thread_
; // Thread used for reading data from the device.
49 const Name device_name_
;
51 DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux
);
56 #endif // MEDIA_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_