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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_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_
#define MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_
#include <stdint.h>
#include <string>
#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/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::list<uint32_t> GetListOfUsableFourCCs(bool favour_mjpeg);
explicit VideoCaptureDeviceLinux(
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:
static int TranslatePowerLineFrequencyToV4L2(PowerLineFrequency frequency);
// 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::list<base::Closure> photo_requests_queue_;
base::Thread v4l2_thread_; // Thread used for reading data from the device.
DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux);
};
} // namespace media
#endif // MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_
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