media/capture/video/file_video_capture_device_factory.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/capture/video/file_video_capture_device_factory.h"
   6
   7 #include "base/command_line.h"
   8 #include "base/files/file_path.h"
   9 #include "base/strings/sys_string_conversions.h"
  10 #include "media/base/media_switches.h"
  11 #include "media/capture/video/file_video_capture_device.h"
  12
  13 namespace media {
  14
  15 const char kFileVideoCaptureDeviceName[] =
  16     "/dev/placeholder-for-file-backed-fake-capture-device";
  17
  18 // Inspects the command line and retrieves the file path parameter.
  19 base::FilePath GetFilePathFromCommandLine() {
  20   base::FilePath command_line_file_path =
  21       base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(
  22           switches::kUseFileForFakeVideoCapture);
  23   CHECK(!command_line_file_path.empty());
  24   return command_line_file_path;
  25 }
  26
  27 scoped_ptr<VideoCaptureDevice> FileVideoCaptureDeviceFactory::Create(
  28     const VideoCaptureDevice::Name& device_name) {
  29   DCHECK(thread_checker_.CalledOnValidThread());
  30 #if defined(OS_WIN)
  31   return scoped_ptr<VideoCaptureDevice>(new FileVideoCaptureDevice(
  32       base::FilePath(base::SysUTF8ToWide(device_name.name()))));
  33 #else
  34   return scoped_ptr<VideoCaptureDevice>(
  35       new FileVideoCaptureDevice(base::FilePath(device_name.name())));
  36 #endif
  37 }
  38
  39 void FileVideoCaptureDeviceFactory::GetDeviceNames(
  40     VideoCaptureDevice::Names* const device_names) {
  41   DCHECK(thread_checker_.CalledOnValidThread());
  42   DCHECK(device_names->empty());
  43   const base::FilePath command_line_file_path = GetFilePathFromCommandLine();
  44 #if defined(OS_WIN)
  45   device_names->push_back(VideoCaptureDevice::Name(
  46       base::SysWideToUTF8(command_line_file_path.value()),
  47       kFileVideoCaptureDeviceName, VideoCaptureDevice::Name::DIRECT_SHOW));
  48 #elif defined(OS_MACOSX)
  49   device_names->push_back(VideoCaptureDevice::Name(
  50       command_line_file_path.value(), kFileVideoCaptureDeviceName,
  51       VideoCaptureDevice::Name::AVFOUNDATION));
  52 #elif defined(OS_LINUX)
  53   device_names->push_back(VideoCaptureDevice::Name(
  54       command_line_file_path.value(), kFileVideoCaptureDeviceName,
  55       VideoCaptureDevice::Name::V4L2_SINGLE_PLANE));
  56 #else
  57   device_names->push_back(VideoCaptureDevice::Name(
  58       command_line_file_path.value(), kFileVideoCaptureDeviceName));
  59 #endif
  60 }
  61
  62 void FileVideoCaptureDeviceFactory::GetDeviceSupportedFormats(
  63     const VideoCaptureDevice::Name& device,
  64     VideoCaptureFormats* supported_formats) {
  65   DCHECK(thread_checker_.CalledOnValidThread());
  66   base::File file =
  67       FileVideoCaptureDevice::OpenFileForRead(GetFilePathFromCommandLine());
  68   if (!file.IsValid())
  69     return;
  70   VideoCaptureFormat capture_format;
  71   FileVideoCaptureDevice::ParseFileAndExtractVideoFormat(&file,
  72                                                          &capture_format);
  73   supported_formats->push_back(capture_format);
  74 }
  75
  76 }  // namespace media