File video capture device supports MJPEG format

media/capture/video/file_video_capture_device_factory.cc

 // 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/capture/video/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"
@@ skipping 45 matching lines @@
 #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 =
+  scoped_ptr<base::MemoryMappedFile> mapped_file =
       FileVideoCaptureDevice::OpenFileForRead(GetFilePathFromCommandLine());
-  if (!file.IsValid())
+  if (!mapped_file->IsValid())

[kcwu, 2015/08/14 11:50:04]

OpenFileForRead() may return nullptr

[henryhsu, 2015/08/17 02:39:33]

Done.

     return;
   VideoCaptureFormat capture_format;
-  FileVideoCaptureDevice::ParseFileAndExtractVideoFormat(&file,
-                                                         &capture_format);
+  int frame_size;
+  if (FileVideoCaptureDevice::ParseFileAndExtractVideoFormat(
+        mapped_file.get(), &capture_format, &frame_size) < 0) {
+    return;
+  }
   supported_formats->push_back(capture_format);
 }
 
 }  // namespace media