MediaStreamVideoSource exports current video format

content/public/renderer/media_stream_api.cc

 // Copyright 2015 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 "content/public/renderer/media_stream_api.h"
 
 #include <utility>
 
 #include "base/callback.h"
 #include "base/guid.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/rand_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/renderer/media/media_stream_audio_source.h"
 #include "content/renderer/media/media_stream_video_capturer_source.h"
+#include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/media/media_stream_video_track.h"
 #include "content/renderer/render_thread_impl.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 #include "third_party/WebKit/public/web/WebMediaStreamRegistry.h"
 #include "url/gurl.h"
 
 namespace content {
 
@@ skipping 79 matching lines @@
   blink::WebMediaStreamTrack web_media_stream_track;
   web_media_stream_track.initialize(web_media_stream_source);
   RenderThreadImpl::current()
       ->GetPeerConnectionDependencyFactory()
       ->CreateLocalAudioTrack(web_media_stream_track);
 
   web_media_stream->addTrack(web_media_stream_track);
   return true;
 }
 
+const media::VideoCaptureFormat* GetCurrentVideoTrackFormat(
+    const blink::WebMediaStreamTrack& video_track) {
+  if (video_track.isNull())
+    return nullptr;
+
+  content::MediaStreamVideoSource* source =
+      content::MediaStreamVideoSource::GetVideoSource(video_track.source());
+  if (!source)
+    return nullptr;
+
+  return source->GetCurrentFormat();
+}
+
 }  // namespace content