MediaStreamVideoSource exports current video format

content/renderer/media/media_stream_video_source.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 "content/renderer/media/media_stream_video_source.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 
@@ skipping 383 matching lines @@
 
   if (tracks_.empty())
     StopSource();
 }
 
 base::SingleThreadTaskRunner* MediaStreamVideoSource::io_task_runner() const {
   DCHECK(CalledOnValidThread());
   return track_adapter_->io_task_runner();
 }
 
+const media::VideoCaptureFormat*
+    MediaStreamVideoSource::GetCurrentFormat() const {
+  DCHECK(CalledOnValidThread());
+  if (state_ == STARTING || state_ == STARTED)
+    return &current_format_;
+  return nullptr;
+}
+
 void MediaStreamVideoSource::DoStopSource() {
   DCHECK(CalledOnValidThread());
   DVLOG(3) << "DoStopSource()";
   if (state_ == ENDED)
     return;
   track_adapter_->StopFrameMonitoring();
   StopSourceImpl();
   state_ = ENDED;
   SetReadyState(blink::WebMediaStreamSource::ReadyStateEnded);
 }
@@ skipping 162 matching lines @@
       callback(callback) {
 }
 
 MediaStreamVideoSource::TrackDescriptor::TrackDescriptor(
     const TrackDescriptor& other) = default;
 
 MediaStreamVideoSource::TrackDescriptor::~TrackDescriptor() {
 }
 
 }  // namespace content