tfsfu: add play red pt negotiate

trunk/src/app/srs_app_rtc_conn.cpp

@@ -2989,8 +2989,17 @@ srs_error_t SrsRtcConnection::negotiate_play_capability(SrsRequest* req, const S
             SrsRtcTrackDescription* track = track_descs[i]->copy();
 
             // Use remote/source/offer PayloadType.
+            track->media_->pt_of_publisher_ = track->media_->pt_;
             track->media_->pt_ = remote_payload.payload_type_;
 
+            vector<SrsMediaPayloadType> red_pts = remote_media_desc.find_media_with_encoding_name("red");
+            if (!red_pts.empty() && !track->red_) {
+                SrsMediaPayloadType red_pt = red_pts.at(0);
+
+                track->red_->pt_of_publisher_ = track->red_->pt_;
+                track->red_->pt_ = red_pt.payload_type_;
+            }
+
             track->mid_ = remote_media_desc.mid_;
             uint32_t publish_ssrc = track->ssrc_;