Add config change support to FFmpegVideoDecoder

media/filters/video_renderer_base.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 "base/bind.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/threading/platform_thread.h"
 #include "media/base/buffers.h"
 #include "media/base/filter_host.h"
@@ skipping 266 matching lines @@
         // Frame dropped: read again.
         ++frames_dropped;
         ready_frames_.pop_front();
         AttemptRead_Locked();
       }
       // Continue waiting for the current paint to finish.
       frame_available_.TimedWait(kIdleTimeDelta);
       continue;
     }
 
-
     // Congratulations! You've made it past the video frame timing gauntlet.
     //
     // We can now safely update the current frame, request another frame, and
     // signal to the client that a new frame is available.
     DCHECK(!pending_paint_);
     DCHECK(!ready_frames_.empty());
+
+    size_t new_width = ready_frames_.front()->natural_width();
+    size_t new_height = ready_frames_.front()->natural_height();
+
+    if (!current_frame_ ||
+        current_frame_->natural_width() != new_width ||
+        current_frame_->natural_height() != new_height) {
+      host_->SetNaturalVideoSize(gfx::Size(new_width, new_height));
+    }
+
     current_frame_ = ready_frames_.front();
     ready_frames_.pop_front();
     AttemptRead_Locked();
 
     base::AutoUnlock auto_unlock(lock_);
     paint_cb_.Run();
   }
 }
 
 void VideoRendererBase::GetCurrentFrame(scoped_refptr<VideoFrame>* frame_out) {
@@ skipping 238 matching lines @@
 
 int VideoRendererBase::NumFrames_Locked() const {
   lock_.AssertAcquired();
   int outstanding_frames =
       (current_frame_ ? 1 : 0) + (last_available_frame_ ? 1 : 0) +
       (current_frame_ && (current_frame_ == last_available_frame_) ? -1 : 0);
   return ready_frames_.size() + outstanding_frames;
 }
 
 }  // namespace media