// Copyright 2014 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.

#include "media/video/capture/file_video_capture_device_factory.h"

#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/strings/sys_string_conversions.h"
#include "media/base/media_switches.h"
#include "media/video/capture/file_video_capture_device.h"

namespace media {

const char kFileVideoCaptureDeviceName[] =
    "/dev/placeholder-for-file-backed-fake-capture-device";

// Inspects the command line and retrieves the file path parameter.
base::FilePath GetFilePathFromCommandLine() {
  base::FilePath command_line_file_path =
      CommandLine::ForCurrentProcess()->GetSwitchValuePath(
          switches::kUseFileForFakeVideoCapture);
  CHECK(!command_line_file_path.empty());
  return command_line_file_path;
}

scoped_ptr<VideoCaptureDevice> FileVideoCaptureDeviceFactory::Create(
    const VideoCaptureDevice::Name& device_name) {
  DCHECK(thread_checker_.CalledOnValidThread());
#if defined(OS_WIN)
  return scoped_ptr<VideoCaptureDevice>(new FileVideoCaptureDevice(
      base::FilePath(base::SysUTF8ToWide(device_name.name()))));
#else
  return scoped_ptr<VideoCaptureDevice>(new FileVideoCaptureDevice(
      base::FilePath(device_name.name())));
#endif
}

void FileVideoCaptureDeviceFactory::GetDeviceNames(
    VideoCaptureDevice::Names* const device_names) {
  DCHECK(thread_checker_.CalledOnValidThread());
  DCHECK(device_names->empty());
  base::FilePath command_line_file_path = GetFilePathFromCommandLine();
#if defined(OS_WIN)
  device_names->push_back(VideoCaptureDevice::Name(
      base::SysWideToUTF8(command_line_file_path.value()),
      kFileVideoCaptureDeviceName));
#elif defined(OS_MACOSX)
  device_names->push_back(VideoCaptureDevice::Name(
      command_line_file_path.value(),
      kFileVideoCaptureDeviceName,
      VideoCaptureDevice::Name::AVFOUNDATION));
#else
  device_names->push_back(VideoCaptureDevice::Name(
      command_line_file_path.value(),
      kFileVideoCaptureDeviceName));
#endif
}

void FileVideoCaptureDeviceFactory::GetDeviceSupportedFormats(
    const VideoCaptureDevice::Name& device,
    VideoCaptureFormats* supported_formats) {
  DCHECK(thread_checker_.CalledOnValidThread());
  base::File file =
      FileVideoCaptureDevice::OpenFileForRead(GetFilePathFromCommandLine());
  VideoCaptureFormat capture_format;
  FileVideoCaptureDevice::ParseFileAndExtractVideoFormat(&file,
                                                         &capture_format);
  supported_formats->push_back(capture_format);
}

}  // namespace media