rendering_helper - Wait for rendering before resetting the decoder.

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 82 matching lines @@
                      base::WaitableEvent* done);
 
   // Render thumbnail in the |texture_id| to the FBO buffer using target
   // |texture_target|.
   void RenderThumbnail(uint32 texture_target, uint32 texture_id);
 
   // Queues the |video_frame| for rendering.
   void QueueVideoFrame(size_t window_id,
                        scoped_refptr<VideoFrameTexture> video_frame);
 
-  // Drops all the pending video frames of the specified window.
-  void DropPendingFrames(size_t window_id);
+  // Flushes the pending frames. Notify the rendering_helper there won't be
+  // more video frames.
+  void Flush(size_t window_id);
 
   // Delete |texture_id|.
   void DeleteTexture(uint32 texture_id);
 
   // Get the platform specific handle to the OpenGL display.
   void* GetGLDisplay();
 
   // Get the platform specific handle to the OpenGL context.
   void* GetGLContext();
 
   // Get rendered thumbnails as RGB.
   // Sets alpha_solid to true if the alpha channel is entirely 0xff.
   void GetThumbnailsAsRGB(std::vector<unsigned char>* rgb,
                           bool* alpha_solid,
                           base::WaitableEvent* done);
 
  private:
   struct RenderedVideo {
     // The rect on the screen where the video will be rendered.
     gfx::Rect render_area;
 
     // 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 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_