[WIP] Move media/capture to device/capture

media/capture/video/file_video_capture_device.h

-// Copyright 2013 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_FILE_VIDEO_CAPTURE_DEVICE_H_
-#define MEDIA_CAPTURE_VIDEO_FILE_VIDEO_CAPTURE_DEVICE_H_
-
-#include <stdint.h>
-
-#include <memory>
-#include <string>
-
-#include "base/files/file.h"
-#include "base/files/memory_mapped_file.h"
-#include "base/macros.h"
-#include "base/threading/thread.h"
-#include "base/threading/thread_checker.h"
-#include "media/capture/video/video_capture_device.h"
-
-namespace media {
-
-class VideoFileParser;
-
-// Implementation of a VideoCaptureDevice class that reads from a file. Used for
-// testing the video capture pipeline when no real hardware is available. The
-// supported file formats are YUV4MPEG2 (a.k.a. Y4M) and MJPEG/JPEG. YUV4MPEG2
-// is a minimal container with a series of uncompressed video only frames, see
-// the link http://wiki.multimedia.cx/index.php?title=YUV4MPEG2 for more
-// information on the file format. Several restrictions and notes apply, see the
-// implementation file.
-// Example Y4M videos can be found in http://media.xiph.org/video/derf.
-// Example MJPEG videos can be found in media/data/test/bear.mjpeg.
-// Restrictions: Y4M videos should have .y4m file extension and MJPEG videos
-// should have .mjpeg file extension.
-class CAPTURE_EXPORT FileVideoCaptureDevice : public VideoCaptureDevice {
- public:
-  // Reads and parses the header of a |file_path|, returning the collected
-  // pixel format in |video_format|. Returns true on file parsed successfully,
-  // or false.
-  // Restrictions: Only trivial Y4M per-frame headers and MJPEG are supported.
-  static bool GetVideoCaptureFormat(const base::FilePath& file_path,
-                                    media::VideoCaptureFormat* video_format);
-
-  // Constructor of the class, with a fully qualified file path as input, which
-  // represents the Y4M or MJPEG file to stream repeatedly.
-  explicit FileVideoCaptureDevice(const base::FilePath& file_path);
-
-  // VideoCaptureDevice implementation, class methods.
-  ~FileVideoCaptureDevice() override;
-  void AllocateAndStart(
-      const VideoCaptureParams& params,
-      std::unique_ptr<VideoCaptureDevice::Client> client) override;
-  void StopAndDeAllocate() override;
-
- private:
-  // Opens a given file |file_path| for reading, and stores collected format
-  // information in |video_format|. Returns the parsed file to the
-  // caller, who is responsible for closing it.
-  static std::unique_ptr<VideoFileParser> GetVideoFileParser(
-      const base::FilePath& file_path,
-      media::VideoCaptureFormat* video_format);
-
-  // Called on the |capture_thread_|.
-  void OnAllocateAndStart(const VideoCaptureParams& params,
-                          std::unique_ptr<Client> client);
-  void OnStopAndDeAllocate();
-  const uint8_t* GetNextFrame();
-  void OnCaptureTask();
-
-  // |thread_checker_| is used to check that destructor, AllocateAndStart() and
-  // StopAndDeAllocate() are called in the correct thread that owns the object.
-  base::ThreadChecker thread_checker_;
-
-  // |capture_thread_| is used for internal operations via posting tasks to it.
-  // It is active between OnAllocateAndStart() and OnStopAndDeAllocate().
-  base::Thread capture_thread_;
-  // The following members belong to |capture_thread_|.
-  std::unique_ptr<VideoCaptureDevice::Client> client_;
-  const base::FilePath file_path_;
-  std::unique_ptr<VideoFileParser> file_parser_;
-  VideoCaptureFormat capture_format_;
-  // Target time for the next frame.
-  base::TimeTicks next_frame_time_;
-  // The system time when we receive the first frame.
-  base::TimeTicks first_ref_time_;
-
-  DISALLOW_COPY_AND_ASSIGN(FileVideoCaptureDevice);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_CAPTURE_VIDEO_FILE_VIDEO_CAPTURE_DEVICE_H_