Extended sanity checks in WASAPIAudioOutputStream

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
 //   factory.
 // - Next some thread will call Open(), at that point the underlying
 //   Core Audio APIs are utilized to create two WASAPI interfaces called
 //   IAudioClient and IAudioRenderClient.
@@ skipping 192 matching lines @@
   static ChannelLayout HardwareChannelLayout();
 
   // Retrieves the sample rate the audio engine uses for its internal
   // processing/mixing of shared-mode streams for the default endpoint device.
   static int HardwareSampleRate(ERole device_role);
 
   // 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 started_; }
+  bool started() const { return render_thread_.get() != NULL; }
 
  private:
   FRIEND_TEST_ALL_PREFIXES(WASAPIAudioOutputStreamTest, HardwareChannelCount);
 
   // Implementation of IUnknown (trivial in this case). See
   // msdn.microsoft.com/en-us/library/windows/desktop/dd371403(v=vs.85).aspx
   // for details regarding why proper implementations of AddRef(), Release()
   // and QueryInterface() are not needed here.
   STDMETHOD_(ULONG, AddRef)();
   STDMETHOD_(ULONG, Release)();
@@ skipping 77 matching lines @@
   // Extended PCM waveform format structure based on WAVEFORMATEXTENSIBLE.
   // Use this for multiple channel and hi-resolution PCM data.
   WAVEFORMATPCMEX format_;
 
   // Copy of the audio format which we know the audio engine supports.
   // It is recommended to ensure that the sample rate in |format_| is identical
   // to the sample rate in |audio_engine_mix_format_|.
   base::win::ScopedCoMem<WAVEFORMATPCMEX> audio_engine_mix_format_;
 
   bool opened_;
-  bool started_;
 
   // Set to true as soon as a new default device is detected, and cleared when
   // the streaming has switched from using the old device to the new device.
   // All additional device detections during an active state are ignored to
   // ensure that the ongoing switch can finalize without disruptions.
   bool restart_rendering_mode_;
 
   // Volume level from 0 to 1.
   float volume_;
 
@@ skipping 59 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_