Enumerate MJPEG as the prefered format if set.

media/video/capture/win/video_capture_device_win.cc

 // Copyright (c) 2012 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/win/video_capture_device_win.h"
 
 #include <ks.h>
 #include <ksmedia.h>
 
 #include <algorithm>
@@ skipping 333 matching lines @@
   ScopedMediaType media_type;
 
   // Get the windows capability from the capture device.
   // GetStreamCaps can return S_FALSE which we consider an error. Therefore the
   // FAILED macro can't be used.
   hr = stream_config->GetStreamCaps(
       found_capability.stream_index, media_type.Receive(), caps.get());
   if (hr != S_OK) {
     SetErrorState("Failed to get capture device capabilities");
     return;
-  } else {
-    if (media_type->formattype == FORMAT_VideoInfo) {
-      VIDEOINFOHEADER* h =
-          reinterpret_cast<VIDEOINFOHEADER*>(media_type->pbFormat);
-      if (format.frame_rate > 0)
-        h->AvgTimePerFrame = kSecondsToReferenceTime / format.frame_rate;
-    }
-    // Set the sink filter to request this format.
-    sink_filter_->SetRequestedMediaFormat(format);
-    // Order the capture device to use this format.
-    hr = stream_config->SetFormat(media_type.get());
-    if (FAILED(hr)) {
-      // TODO(grunell): Log the error. http://crbug.com/405016.
-      SetErrorState("Failed to set capture device output format");
-      return;
-    }
+  }
+  if (media_type->formattype == FORMAT_VideoInfo) {
+    VIDEOINFOHEADER* h =
+        reinterpret_cast<VIDEOINFOHEADER*>(media_type->pbFormat);
+    if (format.frame_rate > 0)
+      h->AvgTimePerFrame = kSecondsToReferenceTime / format.frame_rate;
+  }
+  // Set the sink filter to request this format.
+  sink_filter_->SetRequestedMediaFormat(format);
+  // Order the capture device to use this format.
+  hr = stream_config->SetFormat(media_type.get());
+  if (FAILED(hr)) {
+    // TODO(grunell): Log the error. http://crbug.com/405016.
+    SetErrorState("Failed to set capture device output format");
+    return;
   }
 
   SetAntiFlickerInCaptureFilter();
 
   if (media_type->subtype == kMediaSubTypeHDYC) {
     // HDYC pixel format, used by the DeckLink capture card, needs an AVI
     // decompressor filter after source, let |graph_builder_| add it.
     hr = graph_builder_->Connect(output_capture_pin_.get(),
                                  input_sink_pin_.get());
   } else {
@@ skipping 232 matching lines @@
     return E_FAIL;
   return S_OK;
 }
 
 void VideoCaptureDeviceWin::SetErrorState(const std::string& reason) {
   DCHECK(CalledOnValidThread());
   state_ = kError;
   client_->OnError(reason);
 }
 }  // namespace media