Add playback underflow logic to media::VideoRendererImpl.

media/filters/video_renderer_impl.cc

 // Copyright 2013 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 "media/filters/video_renderer_impl.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/debug/trace_event.h"
@@ skipping 203 matching lines @@
       return;
 
     // Remain idle as long as we're not playing.
     if (state_ != kPlaying || buffering_state_ != BUFFERING_HAVE_ENOUGH) {
       UpdateStatsAndWait_Locked(kIdleTimeDelta);
       continue;
     }
 
     // Remain idle until we have the next frame ready for rendering.
     if (ready_frames_.empty()) {
-      if (received_end_of_stream_ && !rendered_end_of_stream_) {
-        rendered_end_of_stream_ = true;
-        ended_cb_.Run();
+      if (received_end_of_stream_) {
+        if (!rendered_end_of_stream_) {
+          rendered_end_of_stream_ = true;
+          ended_cb_.Run();
+        }
+      } else {
+        buffering_state_ = BUFFERING_HAVE_NOTHING;
+        task_runner_->PostTask(
+            FROM_HERE, base::Bind(buffering_state_cb_, BUFFERING_HAVE_NOTHING));
       }
 
       UpdateStatsAndWait_Locked(kIdleTimeDelta);
       continue;
     }
 
     base::TimeDelta now = get_time_cb_.Run();
     base::TimeDelta target_paint_timestamp = ready_frames_.front()->timestamp();
     base::TimeDelta latest_paint_timestamp;
 
@@ skipping 246 matching lines @@
     statistics_cb_.Run(statistics);
 
     frames_decoded_ = 0;
     frames_dropped_ = 0;
   }
 
   frame_available_.TimedWait(wait_duration);
 }
 
 }  // namespace media