Injectable audio encoders: WebRtcVoiceEngine and company

webrtc/voice_engine/channel.h

Index: webrtc/voice_engine/channel.h
diff --git a/webrtc/voice_engine/channel.h b/webrtc/voice_engine/channel.h
index 58bcb01c0f49e96aecf9a1bedbc28c36c0be44fd..c8e4646dd2bbf778f3f64828824da197fd3e1fc5 100644
--- a/webrtc/voice_engine/channel.h
+++ b/webrtc/voice_engine/channel.h
@@ -170,6 +170,8 @@ class Channel
   // Send using this encoder, with this payload type.
   virtual bool SetEncoder(int payload_type,
                           std::unique_ptr<AudioEncoder> encoder);
+  virtual void ModifyEncoder(

[ossu, 2017/04/04 15:36:38]

Needed to plumb this all the way out. Once we get rid of these extra layers, we
can do these calls directly on the encoder object instead.

+      rtc::FunctionView<void(std::unique_ptr<AudioEncoder>*)> modifier);
 
   // API methods