[WIP] Move media/capture to device/capture

media/capture/video/linux/v4l2_capture_delegate.h

-// Copyright 2015 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.
-
-#ifndef MEDIA_CAPTURE_VIDEO_LINUX_V4L2_CAPTURE_DELEGATE_H_
-#define MEDIA_CAPTURE_VIDEO_LINUX_V4L2_CAPTURE_DELEGATE_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include "base/files/scoped_file.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "build/build_config.h"
-#include "media/capture/video/video_capture_device.h"
-
-#if defined(OS_OPENBSD)
-#include <sys/videoio.h>
-#else
-#include <linux/videodev2.h>
-#endif
-
-namespace tracked_objects {
-class Location;
-}  // namespace tracked_objects
-
-namespace media {
-
-// Class doing the actual Linux capture using V4L2 API. V4L2 SPLANE/MPLANE
-// capture specifics are implemented in derived classes. Created and destroyed
-// on the owner's thread, otherwise living and operating on |v4l2_task_runner_|.
-// TODO(mcasas): Make this class a non-ref-counted.
-class V4L2CaptureDelegate final
-    : public base::RefCountedThreadSafe<V4L2CaptureDelegate> {
- public:
-  // Retrieves the #planes for a given |fourcc|, or 0 if unknown.
-  static size_t GetNumPlanesForFourCc(uint32_t fourcc);
-  // Returns the Chrome pixel format for |v4l2_fourcc| or PIXEL_FORMAT_UNKNOWN.
-  static VideoPixelFormat V4l2FourCcToChromiumPixelFormat(
-      uint32_t v4l2_fourcc);
-
-  // Composes a list of usable and supported pixel formats, in order of
-  // preference, with MJPEG prioritised depending on |prefer_mjpeg|.
-  static std::list<uint32_t> GetListOfUsableFourCcs(bool prefer_mjpeg);
-
-  V4L2CaptureDelegate(
-      const VideoCaptureDevice::Name& device_name,
-      const scoped_refptr<base::SingleThreadTaskRunner>& v4l2_task_runner,
-      int power_line_frequency);
-
-  // Forward-to versions of VideoCaptureDevice virtual methods.
-  void AllocateAndStart(int width,
-                        int height,
-                        float frame_rate,
-                        std::unique_ptr<VideoCaptureDevice::Client> client);
-  void StopAndDeAllocate();
-
-  void SetRotation(int rotation);
-
- private:
-  friend class base::RefCountedThreadSafe<V4L2CaptureDelegate>;
-  ~V4L2CaptureDelegate();
-
-  // VIDIOC_QUERYBUFs a buffer from V4L2, creates a BufferTracker for it and
-  // enqueues it (VIDIOC_QBUF) back into V4L2.
-  bool MapAndQueueBuffer(int index);
-
-  void DoCapture();
-
-  void SetErrorState(const tracked_objects::Location& from_here,
-                     const std::string& reason);
-
-  const scoped_refptr<base::SingleThreadTaskRunner> v4l2_task_runner_;
-  const VideoCaptureDevice::Name device_name_;
-  const int power_line_frequency_;
-
-  // The following members are only known on AllocateAndStart().
-  VideoCaptureFormat capture_format_;
-  v4l2_format video_fmt_;
-  std::unique_ptr<VideoCaptureDevice::Client> client_;
-  base::ScopedFD device_fd_;
-
-  // Vector of BufferTracker to keep track of mmap()ed pointers and their use.
-  class BufferTracker;
-  std::vector<scoped_refptr<BufferTracker>> buffer_tracker_pool_;
-
-  bool is_capturing_;
-  int timeout_count_;
-
-  // Clockwise rotation in degrees. This value should be 0, 90, 180, or 270.
-  int rotation_;
-
-  DISALLOW_COPY_AND_ASSIGN(V4L2CaptureDelegate);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_CAPTURE_VIDEO_LINUX_V4L2_CAPTURE_DELEGATE_H_