AudioSource allows implementations to return settings

So far the code assumed that there is only one implementation of AudioSourceInterface: LocalAudioSource.
That is not true. This change allows custom implementations to still set options (such as audio network adaptation) on the source.

Long term solution should include refactoring options so that they are passed to peer connection or call object, and not be defined on audio source.


Bug: webrtc:9719
Change-Id: Ic3b92219502bc73a964adbbb9c5cd7156aa382e1
Reviewed-on: https://webrtc-review.googlesource.com/c/110681
Commit-Queue: Peter Slatala <psla@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25626}
diff --git a/api/mediastreaminterface.cc b/api/mediastreaminterface.cc
index e36d5cb..955e7e4 100644
--- a/api/mediastreaminterface.cc
+++ b/api/mediastreaminterface.cc
@@ -30,4 +30,8 @@
   return nullptr;
 }
 
+const cricket::AudioOptions AudioSourceInterface::options() const {
+  return {};
+}
+
 }  // namespace webrtc
diff --git a/api/mediastreaminterface.h b/api/mediastreaminterface.h
index 30f8f71..6d96766 100644
--- a/api/mediastreaminterface.h
+++ b/api/mediastreaminterface.h
@@ -23,6 +23,7 @@
 #include <vector>
 
 #include "absl/types/optional.h"
+#include "api/audio_options.h"
 #include "api/video/video_frame.h"
 #include "api/video/video_sink_interface.h"
 #include "api/video/video_source_interface.h"
@@ -207,6 +208,11 @@
   // TODO(tommi): Make pure virtual.
   virtual void AddSink(AudioTrackSinkInterface* sink) {}
   virtual void RemoveSink(AudioTrackSinkInterface* sink) {}
+
+  // Returns options for the AudioSource.
+  // (for some of the settings this approach is broken, e.g. setting
+  // audio network adaptation on the source is the wrong layer of abstraction).
+  virtual const cricket::AudioOptions options() const;
 };
 
 // Interface of the audio processor used by the audio track to collect
diff --git a/pc/localaudiosource.h b/pc/localaudiosource.h
index c5f6530..c48f540 100644
--- a/pc/localaudiosource.h
+++ b/pc/localaudiosource.h
@@ -29,7 +29,7 @@
   SourceState state() const override { return kLive; }
   bool remote() const override { return false; }
 
-  virtual const cricket::AudioOptions& options() const { return options_; }
+  const cricket::AudioOptions options() const override { return options_; }
 
   void AddSink(AudioTrackSinkInterface* sink) override {}
   void RemoveSink(AudioTrackSinkInterface* sink) override {}
diff --git a/pc/rtpsender.cc b/pc/rtpsender.cc
index 3196641..abd1748 100644
--- a/pc/rtpsender.cc
+++ b/pc/rtpsender.cc
@@ -405,9 +405,7 @@
   // options since it is also applied to all streams/channels, local or remote.
   if (track_->enabled() && track_->GetSource() &&
       !track_->GetSource()->remote()) {
-    // TODO(xians): Remove this static_cast since we should be able to connect
-    // a remote audio track to a peer connection.
-    options = static_cast<LocalAudioSource*>(track_->GetSource())->options();
+    options = track_->GetSource()->options();
   }
 #endif