Ensure the RtcEventLog parser is backwards compatible

webrtc/logging/rtc_event_log/rtc_event_log2text.cc

 /*
  *  Copyright (c) 2017 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 334 matching lines @@
   webrtc::ParsedRtcEventLog parsed_stream;
   if (!parsed_stream.ParseFile(input_file)) {
     std::cerr << "Error while parsing input file: " << input_file << std::endl;
     return -1;
   }
 
   for (size_t i = 0; i < parsed_stream.GetNumberOfEvents(); i++) {
     if (!FLAGS_noconfig && !FLAGS_novideo && !FLAGS_noincoming &&
         parsed_stream.GetEventType(i) ==
             webrtc::ParsedRtcEventLog::VIDEO_RECEIVER_CONFIG_EVENT) {
-      webrtc::rtclog::StreamConfig config;
-      parsed_stream.GetVideoReceiveConfig(i, &config);
+      webrtc::rtclog::StreamConfig config =
+          parsed_stream.GetVideoReceiveConfig(i);
       std::cout << parsed_stream.GetTimestamp(i) << "\tVIDEO_RECV_CONFIG"
                 << "\tssrc=" << config.remote_ssrc
                 << "\tfeedback_ssrc=" << config.local_ssrc << std::endl;
     }
     if (!FLAGS_noconfig && !FLAGS_novideo && !FLAGS_nooutgoing &&
         parsed_stream.GetEventType(i) ==
             webrtc::ParsedRtcEventLog::VIDEO_SENDER_CONFIG_EVENT) {
-      webrtc::rtclog::StreamConfig config;
-      parsed_stream.GetVideoSendConfig(i, &config);
+      std::vector<webrtc::rtclog::StreamConfig> configs =
+          parsed_stream.GetVideoSendConfig(i);
+      for (size_t j = 0; j < configs.size(); j++) {
         std::cout << parsed_stream.GetTimestamp(i) << "\tVIDEO_SEND_CONFIG";
-        std::cout << "\tssrcs=" << config.local_ssrc;
-        std::cout << "\trtx_ssrcs=" << config.rtx_ssrc;
+        std::cout << "\tssrcs=" << configs[j].local_ssrc;
+        std::cout << "\trtx_ssrcs=" << configs[j].rtx_ssrc;
         std::cout << std::endl;
+      }
     }
     if (!FLAGS_noconfig && !FLAGS_noaudio && !FLAGS_noincoming &&
         parsed_stream.GetEventType(i) ==
             webrtc::ParsedRtcEventLog::AUDIO_RECEIVER_CONFIG_EVENT) {
-      webrtc::rtclog::StreamConfig config;
-      parsed_stream.GetAudioReceiveConfig(i, &config);
+      webrtc::rtclog::StreamConfig config =
+          parsed_stream.GetAudioReceiveConfig(i);
       std::cout << parsed_stream.GetTimestamp(i) << "\tAUDIO_RECV_CONFIG"
                 << "\tssrc=" << config.remote_ssrc
                 << "\tfeedback_ssrc=" << config.local_ssrc << std::endl;
     }
     if (!FLAGS_noconfig && !FLAGS_noaudio && !FLAGS_nooutgoing &&
         parsed_stream.GetEventType(i) ==
             webrtc::ParsedRtcEventLog::AUDIO_SENDER_CONFIG_EVENT) {
-      webrtc::rtclog::StreamConfig config;
-      parsed_stream.GetAudioSendConfig(i, &config);
+      webrtc::rtclog::StreamConfig config = parsed_stream.GetAudioSendConfig(i);
       std::cout << parsed_stream.GetTimestamp(i) << "\tAUDIO_SEND_CONFIG"
                 << "\tssrc=" << config.local_ssrc << std::endl;
     }
     if (!FLAGS_nortp &&
         parsed_stream.GetEventType(i) == webrtc::ParsedRtcEventLog::RTP_EVENT) {
       size_t header_length;
       size_t total_length;
       uint8_t header[IP_PACKET_SIZE];
       webrtc::PacketDirection direction;
 
@@ skipping 61 matching lines @@
                             direction);
             break;
           default:
             break;
         }
       }
     }
   }
   return 0;
 }