Ensures that WASAPI audio output does not go silent in rare cases

media/audio/win/audio_low_latency_output_win.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.
 
 // Implementation of AudioOutputStream for Windows using Windows Core Audio
 // WASAPI for low latency rendering.
 //
 // Overview of operation and performance:
 //
 // - An object of WASAPIAudioOutputStream is created by the AudioManager
@@ skipping 144 matching lines @@
   // Returns AUDCLNT_SHAREMODE_EXCLUSIVE if --enable-exclusive-mode is used
   // as command-line flag and AUDCLNT_SHAREMODE_SHARED otherwise (default).
   static AUDCLNT_SHAREMODE GetShareMode();
 
   bool started() const { return render_thread_.get() != NULL; }
 
  private:
   // DelegateSimpleThread::Delegate implementation.
   virtual void Run() OVERRIDE;
 
+  // Core part of the thread loop which controls the actual rendering.
+  // Checks available amount of space in the endpoint buffer and reads
+  // data from the client to fill up the buffer without causing audio
+  // glitches.
+  void RenderAudioFromSource(IAudioClock* audio_clock, UINT64 device_frequency);
+
   // Issues the OnError() callback to the |sink_|.
   void HandleError(HRESULT err);
 
   // Called when the device will be opened in exclusive mode and use the
   // application specified format.
   // TODO(henrika): rewrite and move to CoreAudioUtil when removing flag
   // for exclusive audio mode.
   HRESULT ExclusiveModeInitialization(IAudioClient* client,
                                       HANDLE event_handle,
                                       uint32* endpoint_buffer_size);
@@ skipping 72 matching lines @@
 
   // Container for retrieving data from AudioSourceCallback::OnMoreData().
   scoped_ptr<AudioBus> audio_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(WASAPIAudioOutputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_