rendering_helper - Drop frames if the decoder cannot catch up.

content/common/gpu/media/rendering_helper.h

 // 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.
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_RENDERING_HELPER_H_
 #define CONTENT_COMMON_GPU_MEDIA_RENDERING_HELPER_H_
 
 #include <map>
 #include <queue>
 #include <vector>
@@ skipping 116 matching lines @@
     // True if the last (and the only one) frame in pending_frames has
     // been rendered. We keep the last remaining frame in pending_frames even
     // after it has been rendered, so that we have something to display if the
     // client is falling behind on providing us with new frames during
     // timer-driven playback.
     bool last_frame_rendered;
 
     // True if there won't be any new video frames comming.
     bool is_flushing;
 
+    // The number of frames need to be dropped to catch up the rendering.
+    int frames_to_drop;
+
     // The video frames pending for rendering.
     std::queue<scoped_refptr<VideoFrameTexture> > pending_frames;
 
     RenderedVideo();
     ~RenderedVideo();
   };
 
   void Clear();
 
   void RenderContent();
@@ skipping 25 matching lines @@
   gfx::Size thumbnail_size_;
   GLuint program_;
   base::TimeDelta frame_duration_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderingHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_RENDERING_HELPER_H_