Removing `preference` field from `cricket::Codec`.

webrtc/media/engine/webrtcvideoengine2.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 163 matching lines @@
   codec->AddFeedbackParam(FeedbackParam(kRtcpFbParamNack, kParamValueEmpty));
   codec->AddFeedbackParam(FeedbackParam(kRtcpFbParamNack, kRtcpFbNackParamPli));
   codec->AddFeedbackParam(FeedbackParam(kRtcpFbParamRemb, kParamValueEmpty));
   codec->AddFeedbackParam(
       FeedbackParam(kRtcpFbParamTransportCc, kParamValueEmpty));
 }
 
 static VideoCodec MakeVideoCodecWithDefaultFeedbackParams(int payload_type,
                                                           const char* name) {
   VideoCodec codec(payload_type, name, kDefaultVideoMaxWidth,
-                   kDefaultVideoMaxHeight, kDefaultVideoMaxFramerate, 0);
+                   kDefaultVideoMaxHeight, kDefaultVideoMaxFramerate);
   AddDefaultFeedbackParams(&codec);
   return codec;
 }
 
 static std::string CodecVectorToString(const std::vector<VideoCodec>& codecs) {
   std::stringstream out;
   out << '{';
   for (size_t i = 0; i < codecs.size(); ++i) {
     out << codecs[i].ToString();
     if (i != codecs.size() - 1) {
@@ skipping 432 matching lines @@
     // Don't add internally-supported codecs twice.
     if (CodecIsInternallySupported(codecs[i].name)) {
       continue;
     }
 
     // External video encoders are given payloads 120-127. This also means that
     // we only support up to 8 external payload types.
     const int kExternalVideoPayloadTypeBase = 120;
     size_t payload_type = kExternalVideoPayloadTypeBase + i;
     RTC_DCHECK(payload_type < 128);
-    VideoCodec codec(static_cast<int>(payload_type),
-                     codecs[i].name,
-                     codecs[i].max_width,
-                     codecs[i].max_height,
-                     codecs[i].max_fps,
-                     0);
+    VideoCodec codec(static_cast<int>(payload_type), codecs[i].name,
+                     codecs[i].max_width, codecs[i].max_height,
+                     codecs[i].max_fps);
 
     AddDefaultFeedbackParams(&codec);
     supported_codecs.push_back(codec);
   }
   return supported_codecs;
 }
 
 WebRtcVideoChannel2::WebRtcVideoChannel2(
     webrtc::Call* call,
     const MediaConfig& config,
@@ skipping 67 matching lines @@
   // to be recreates which causes a "blink" of black video.  In order
   // to support munging the SDP in this way without recreating receive
   // streams, we ignore the order of the received codecs so that
   // changing the order doesn't cause this "blink".
   auto comparison =
       [](const VideoCodecSettings& codec1, const VideoCodecSettings& codec2) {
         return codec1.codec.id > codec2.codec.id;
       };
   std::sort(before.begin(), before.end(), comparison);
   std::sort(after.begin(), after.end(), comparison);
-  for (size_t i = 0; i < before.size(); ++i) {
-    // For the same reason that we sort the codecs, we also ignore the
-    // preference.  We don't want a preference change on the receive
-    // side to cause recreation of the stream.
-    before[i].codec.preference = 0;
-    after[i].codec.preference = 0;
-    if (before[i] != after[i]) {
-      return true;
-    }
-  }
-  return false;
+  return before != after;
 }
 
 bool WebRtcVideoChannel2::GetChangedSendParameters(
     const VideoSendParameters& params,
     ChangedSendParameters* changed_params) const {
   if (!ValidateCodecFormats(params.codecs) ||
       !ValidateRtpExtensions(params.extensions)) {
     return false;
   }
 
@@ skipping 1842 matching lines @@
         rtx_mapping[video_codecs[i].codec.id] !=
             fec_settings.red_payload_type) {
       video_codecs[i].rtx_payload_type = rtx_mapping[video_codecs[i].codec.id];
     }
   }
 
   return video_codecs;
 }
 
 }  // namespace cricket