Experimental: Unmute Audio During Tab Sourced Desktop Share

media/audio/audio_output_controller.h

Index: media/audio/audio_output_controller.h
diff --git a/media/audio/audio_output_controller.h b/media/audio/audio_output_controller.h
index 58e1e458a97e1ec06b5157706a62940919b7d2cc..fd64a68b88bbe6569f25c097c1fac288771753f8 100644
--- a/media/audio/audio_output_controller.h
+++ b/media/audio/audio_output_controller.h
@@ -5,6 +5,7 @@
 #ifndef MEDIA_AUDIO_AUDIO_OUTPUT_CONTROLLER_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_CONTROLLER_H_
 
+#include <set>
 #include <stdint.h>
 
 #include "base/atomic_ref_count.h"
@@ -19,6 +20,7 @@
 #include "media/audio/audio_power_monitor.h"
 #include "media/audio/audio_source_diverter.h"
 #include "media/audio/simple_sources.h"
+#include "media/audio/virtual_audio_output_stream.h"
 #include "media/base/media_export.h"
 
 // An AudioOutputController controls an AudioOutputStream and provides data
@@ -176,6 +178,8 @@ class MEDIA_EXPORT AudioOutputController
   const AudioParameters& GetAudioParameters() override;
   void StartDiverting(AudioOutputStream* to_stream) override;
   void StopDiverting() override;
+  void StartDuplicating(AudioPushSink* to_stream) override;
+  void StopDuplicating(AudioPushSink* to_stream) override;
 
   // Accessor for AudioPowerMonitor::ReadCurrentPowerAndClip().  See comments in
   // audio_power_monitor.h for usage.  This may be called on any thread.
@@ -217,11 +221,14 @@ class MEDIA_EXPORT AudioOutputController
   void DoStartDiverting(AudioOutputStream* to_stream);
   void DoStopDiverting();
 
+  void DoStartDuplicating(AudioPushSink* to_stream);
+  void DoStopDuplicating(AudioPushSink* to_stream);
+
   // Helper method that stops the physical stream.
   void StopStream();
 
   // Helper method that stops, closes, and NULLs |*stream_|.
-  void DoStopCloseAndClearStream();
+  void DoStopCloseAndClearStream(bool isForDeviceChange);
 
   // Checks if a stream was started successfully but never calls OnMoreData().
   void WedgeCheck();
@@ -239,6 +246,8 @@ class MEDIA_EXPORT AudioOutputController
   // When non-NULL, audio is being diverted to this stream.
   AudioOutputStream* diverting_to_stream_;
 
+  std::set<AudioPushSink*> duplicator_;
+
   // The current volume of the audio stream.
   double volume_;