Media track ID visibility at BWE level

webrtc/call/audio_send_stream.h

Index: webrtc/call/audio_send_stream.h
diff --git a/webrtc/call/audio_send_stream.h b/webrtc/call/audio_send_stream.h
index 6c7e707d93bcd8b9710c7b20dc90fa7262be110a..0006fb229ff76c5ca206e502e75191cacb5175e9 100644
--- a/webrtc/call/audio_send_stream.h
+++ b/webrtc/call/audio_send_stream.h
@@ -123,6 +123,9 @@ class AudioSendStream {
 
     rtc::Optional<SendCodecSpec> send_codec_spec;
     rtc::scoped_refptr<AudioEncoderFactory> encoder_factory;
+
+    // Track ID as specified during track creation.
+    std::string track_id;

[nisse-webrtc, 2017/09/18 08:44:28]

Is the id of a track constant, or can it be changed after track is created?

[alexnarest, 2017/09/29 12:13:57]

I do not think track_id can be changed directly but config_ may be changed like
at
https://cs.corp.google.com/piper///depot/google3/third_party/webrtc/files/sta...

   };
 
   // Reconfigure the stream according to the Configuration.