Unmute Tab Audio For Desktop Share

media/audio/audio_source_diverter.h

Index: media/audio/audio_source_diverter.h
diff --git a/media/audio/audio_source_diverter.h b/media/audio/audio_source_diverter.h
index 787ddec7867dfd693ce04623ca1bb23d4ca2c949..79a49a6c302b56cf74fa072f87aaf48e5e62678e 100644
--- a/media/audio/audio_source_diverter.h
+++ b/media/audio/audio_source_diverter.h
@@ -5,6 +5,8 @@
 #ifndef MEDIA_AUDIO_AUDIO_SOURCE_DIVERTER_H_
 #define MEDIA_AUDIO_AUDIO_SOURCE_DIVERTER_H_
 
+#include "base/time/time.h"
+#include "media/base/audio_bus.h"
 #include "media/base/media_export.h"
 
 // Audio sources may optionally implement AudioSourceDiverter to temporarily
@@ -17,6 +19,13 @@ namespace media {
 class AudioOutputStream;
 class AudioParameters;
 
+class MEDIA_EXPORT AudioPushSink {
+ public:
+  virtual void OnData(const AudioBus& source,
+                      base::TimeTicks reference_time) = 0;
+  virtual void Close() = 0;

[miu, 2016/05/06 22:29:50]

Please add a comment for Close() here (that it has the same semantics as
AudioOutputStream, where Close() invalidates the instance).

[qiangchen, 2016/05/10 22:36:53]

Done.

+};
+
 class MEDIA_EXPORT AudioSourceDiverter {
 public:
   // Returns the audio parameters of the divertable audio data.
@@ -31,7 +40,15 @@ public:
   // responsible for making sure the stream is closed, perhaps asynchronously.
   virtual void StopDiverting() = 0;
 
-protected:
+  // Start duplicating the current audio stream, and push the copied data into
+  // |sink|.
+  virtual void StartDuplicating(AudioPushSink* sink) = 0;
+
+  // Stop duplicating for the specified |sink|.  The AudioSourceDiverter is
+  // responsible for making sure the stream is closed, perhaps asynchronously.

[miu, 2016/05/06 22:29:50]

nit: s/stream is closed/sink is closed/

[qiangchen, 2016/05/10 22:36:53]

Done.

+  virtual void StopDuplicating(AudioPushSink* sink) = 0;
+
+ protected:
   virtual ~AudioSourceDiverter() {}
 };