Send kStopMark from AudioOutputController to stop AudioThread in renderer

media/audio/audio_output_controller.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 "media/audio/audio_output_controller.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/message_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/platform_thread.h"
 #include "base/time.h"
 
 using base::Time;
 using base::WaitableEvent;
 
 namespace media {
 
-// Signal a pause in low-latency mode.
+// Special signals to send to the renderer in low-latency mode.
 const int AudioOutputController::kPauseMark = -1;
+const int AudioOutputController::kStopMark = -2;
 
 // Polling-related constants.
 const int AudioOutputController::kPollNumAttempts = 3;
 const int AudioOutputController::kPollPauseInMilliseconds = 3;
 
 AudioOutputController::AudioOutputController(AudioManager* audio_manager,
                                              EventHandler* handler,
                                              uint32 capacity,
                                              SyncReader* sync_reader)
     : audio_manager_(audio_manager),
@@ skipping 265 matching lines @@
   }
 }
 
 void AudioOutputController::DoClose(const base::Closure& closed_task) {
   DCHECK(message_loop_->BelongsToCurrentThread());
 
   if (state_ != kClosed) {
     DoStopCloseAndClearStream(NULL);
 
     if (LowLatencyMode()) {
+      sync_reader_->UpdatePendingBytes(kStopMark);
       sync_reader_->Close();
     }
 
     state_ = kClosed;
   }
 
   closed_task.Run();
 }
 
 void AudioOutputController::DoSetVolume(double volume) {
@@ skipping 109 matching lines @@
     stream_ = NULL;
     weak_this_.InvalidateWeakPtrs();
   }
 
   // Should be last in the method, do not touch "this" from here on.
   if (done != NULL)
     done->Signal();
 }
 
 }  // namespace media