Make RTX pt/apt reconfigurable by calling WebRtcVideoChannel2::SetRecvParameters.

webrtc/logging/rtc_event_log/rtc_event_log.cc

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 222 matching lines @@
   event->set_type(rtclog::Event::VIDEO_RECEIVER_CONFIG_EVENT);
 
   rtclog::VideoReceiveConfig* receiver_config =
       event->mutable_video_receiver_config();
   receiver_config->set_remote_ssrc(config.rtp.remote_ssrc);
   receiver_config->set_local_ssrc(config.rtp.local_ssrc);
 
   receiver_config->set_rtcp_mode(ConvertRtcpMode(config.rtp.rtcp_mode));
   receiver_config->set_remb(config.rtp.remb);
 
-  for (const auto& kv : config.rtp.rtx) {
+  for (const auto& kv : config.rtp.rtx_payload_types) {
     rtclog::RtxMap* rtx = receiver_config->add_rtx_map();
     rtx->set_payload_type(kv.first);
-    rtx->mutable_config()->set_rtx_ssrc(kv.second.ssrc);
-    rtx->mutable_config()->set_rtx_payload_type(kv.second.payload_type);
+    rtx->mutable_config()->set_rtx_ssrc(config.rtp.rtx_ssrc);

[brandtr, 2017/01/20 14:49:22]

Always writing the same SSRC here, which is effectively what was done before as
well.

+    rtx->mutable_config()->set_rtx_payload_type(kv.second);
   }
 
   for (const auto& e : config.rtp.extensions) {
     rtclog::RtpHeaderExtension* extension =
         receiver_config->add_header_extensions();
     extension->set_name(e.uri);
     extension->set_id(e.id);
   }
 
   for (const auto& d : config.decoders) {
@@ skipping 217 matching lines @@
 #else
   return std::unique_ptr<RtcEventLog>(new RtcEventLogNullImpl());
 #endif  // ENABLE_RTC_EVENT_LOG
 }
 
 std::unique_ptr<RtcEventLog> RtcEventLog::CreateNull() {
   return std::unique_ptr<RtcEventLog>(new RtcEventLogNullImpl());
 }
 
 }  // namespace webrtc