Switch to STA mode for audio thread and WASAPI I/O streams.

media/audio/win/audio_low_latency_input_win.h

Index: media/audio/win/audio_low_latency_input_win.h
diff --git a/media/audio/win/audio_low_latency_input_win.h b/media/audio/win/audio_low_latency_input_win.h
index e933a4471303817b75ae38127cf7dd7db51eab39..9161881972c2cb5b95e5953d806b74b26b0d3a66 100644
--- a/media/audio/win/audio_low_latency_input_win.h
+++ b/media/audio/win/audio_low_latency_input_win.h
@@ -131,6 +131,11 @@ class MEDIA_EXPORT WASAPIAudioInputStream
                               WAVEFORMATEX** device_format,
                               int* effects);
 
+  // Handles sharing of COM pointers between the audio and capture threads.

[tommi (sloooow) - chröme, 2015/04/22 10:31:52]

maybe add a note about thread requirements? (these methods need to be called on
a specific thread, right?)

[DaleCurtis, 2015/04/22 17:48:54]

Done.

+  bool MarshalComPointers();
+  bool UnmarshalComPointers(
+      base::win::ScopedComPtr<IAudioCaptureClient>* audio_capture_client);
+
   // Our creator, the audio manager needs to be notified when we close.
   AudioManagerWin* manager_;
 
@@ -179,8 +184,17 @@ class MEDIA_EXPORT WASAPIAudioInputStream
   // Pointer to the object that will receive the recorded audio samples.
   AudioInputCallback* sink_;
 
-  // Windows Multimedia Device (MMDevice) API interfaces.
+  // ------------------------------------------------------
+  // Warning: COM pointers must be marshaled from the audio thread to be used
+  // on any other thread. Do not use any of these interfaces on a thread other
+  // than the audio thread.  See MarshalComPointers() and UnmarshalComPointers()
+  // for marshaling pointers to the capture thread.
+
+  // Stream into which the COM pointers below are marshaled so that they can
+  // be used on another thread.
+  base::win::ScopedComPtr<IStream> com_stream_;
 
+  // Windows Multimedia Device (MMDevice) API interfaces.
   // An IMMDevice interface which represents an audio endpoint device.
   base::win::ScopedComPtr<IMMDevice> endpoint_device_;
 
@@ -198,16 +212,17 @@ class MEDIA_EXPORT WASAPIAudioInputStream
   // details.
   base::win::ScopedComPtr<IAudioClient> audio_render_client_for_loopback_;
 
-  // The IAudioCaptureClient interface enables a client to read input data
-  // from a capture endpoint buffer.
-  base::win::ScopedComPtr<IAudioCaptureClient> audio_capture_client_;
-
   // The ISimpleAudioVolume interface enables a client to control the
   // master volume level of an audio session.
   // The volume-level is a value in the range 0.0 to 1.0.
   // This interface does only work with shared-mode streams.
   base::win::ScopedComPtr<ISimpleAudioVolume> simple_audio_volume_;
 
+  // The IAudioCaptureClient interface enables a client to read input data
+  // from a capture endpoint buffer.
+  base::win::ScopedComPtr<IAudioCaptureClient> audio_capture_client_;
+  // ------------------------------------------------------
+
   // The audio engine will signal this event each time a buffer has been
   // recorded.
   base::win::ScopedHandle audio_samples_ready_event_;