Experimental: Unmute Audio During Tab Sourced Desktop Share

content/browser/media/capture/web_contents_audio_input_stream.cc

Index: content/browser/media/capture/web_contents_audio_input_stream.cc
diff --git a/content/browser/media/capture/web_contents_audio_input_stream.cc b/content/browser/media/capture/web_contents_audio_input_stream.cc
index ce8f7f46419f158a31a0540eb0b9583e997d0848..fe793d45c7fb46aa1324d83457e94cdf92568603 100644
--- a/content/browser/media/capture/web_contents_audio_input_stream.cc
+++ b/content/browser/media/capture/web_contents_audio_input_stream.cc
@@ -87,9 +87,16 @@ class WebContentsAudioInputStream::Impl
   media::AudioOutputStream* AddInput(
       const media::AudioParameters& params) override;
 
+  media::AudioPushSink* AddPushInput(
+      const media::AudioParameters& params) override;
+
   // Callback which is run when |stream| is closed.  Deletes |stream|.
   void ReleaseInput(media::VirtualAudioOutputStream* stream);
 
+  void ReleasePushInput(media::LoopbackSink* stream);
+
+  bool IsDuplication() override;
+
   // Called by WebContentsTracker when the target of the audio mirroring has
   // changed.
   void OnTargetChanged(bool had_target);
@@ -302,6 +309,24 @@ void WebContentsAudioInputStream::Impl::ReleaseInput(
   delete stream;
 }
 
+media::AudioPushSink* WebContentsAudioInputStream::Impl::AddPushInput(
+    const media::AudioParameters& params) {
+  // Note: The closure created here holds a reference to "this," which will
+  // guarantee the VirtualAudioInputStream (mixer_stream_) outlives the
+  // VirtualAudioOutputStream.
+  return new media::LoopbackSink(params, mixer_stream_.get(),
+                                 base::Bind(&Impl::ReleasePushInput, this));
+}
+
+void WebContentsAudioInputStream::Impl::ReleasePushInput(
+    media::LoopbackSink* stream) {
+  delete stream;
+}
+
+bool WebContentsAudioInputStream::Impl::IsDuplication() {
+  return true;
+}
+
 void WebContentsAudioInputStream::Impl::OnTargetChanged(bool had_target) {
   DCHECK(thread_checker_.CalledOnValidThread());