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// 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_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_
#define MEDIA_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_
#include <string>
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/threading/thread.h"
#include "media/base/video_capture_types.h"
#include "media/capture/video/video_capture_device.h"
namespace media {
class V4L2CaptureDelegate;
// Linux V4L2 implementation of VideoCaptureDevice.
class VideoCaptureDeviceLinux : public VideoCaptureDevice {
public:
static VideoPixelFormat V4l2FourCcToChromiumPixelFormat(
uint32 v4l2_fourcc);
static std::list<uint32_t> GetListOfUsableFourCCs(bool favour_mjpeg);
explicit VideoCaptureDeviceLinux(const Name& device_name);
~VideoCaptureDeviceLinux() override;
// VideoCaptureDevice implementation.
void AllocateAndStart(const VideoCaptureParams& params,
scoped_ptr<Client> client) override;
void StopAndDeAllocate() override;
protected:
void SetRotation(int rotation);
private:
static int TranslatePowerLineFrequencyToV4L2(int frequency);
// Internal delegate doing the actual capture setting, buffer allocation and
// circulation with the V4L2 API. Created and deleted in the thread where
// VideoCaptureDeviceLinux lives but otherwise operating on |v4l2_thread_|.
scoped_refptr<V4L2CaptureDelegate> capture_impl_;
base::Thread v4l2_thread_; // Thread used for reading data from the device.
const Name device_name_;
DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux);
};
} // namespace media
#endif // MEDIA_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_
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