Reverse |rtx_payload_types| map, and rename.

webrtc/media/engine/webrtcvideoengine.cc

 /*
  *  Copyright (c) 2014 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 2202 matching lines @@
     allocated_decoders_.push_back(allocated_decoder);
 
     webrtc::VideoReceiveStream::Decoder decoder;
     decoder.decoder = allocated_decoder.decoder;
     decoder.payload_type = recv_codecs[i].codec.id;
     decoder.payload_name = recv_codecs[i].codec.name;
     decoder.codec_params = recv_codecs[i].codec.params;
     config_.decoders.push_back(decoder);
   }
 
-  config_.rtp.rtx_payload_types.clear();
+  config_.rtp.media_pt_by_rtx_pt.clear();
   for (const VideoCodecSettings& recv_codec : recv_codecs) {
-    config_.rtp.rtx_payload_types[recv_codec.codec.id] =
-        recv_codec.rtx_payload_type;
+    config_.rtp.media_pt_by_rtx_pt[recv_codec.rtx_payload_type] =
+        recv_codec.codec.id;
   }
 
   config_.rtp.ulpfec = recv_codecs.front().ulpfec;
 
   config_.rtp.nack.rtp_history_ms =
       HasNack(recv_codecs.begin()->codec) ? kNackHistoryMs : 0;
 }
 
 void WebRtcVideoChannel::WebRtcVideoReceiveStream::ConfigureFlexfecCodec(
     int flexfec_payload_type) {
@@ skipping 413 matching lines @@
     stream.temporal_layer_thresholds_bps.resize(GetDefaultVp9TemporalLayers() -
                                                 1);
   }
 
   std::vector<webrtc::VideoStream> streams;
   streams.push_back(stream);
   return streams;
 }
 
 }  // namespace cricket