Revert of Stop caching supported codecs in WebRtcVideoEngine2

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 525 matching lines @@
   if (default_recv_ssrc_ != 0) {
     channel->SetSink(default_recv_ssrc_, default_sink_);
   }
 }
 
 WebRtcVideoEngine2::WebRtcVideoEngine2()
     : initialized_(false),
       external_decoder_factory_(NULL),
       external_encoder_factory_(NULL) {
   LOG(LS_INFO) << "WebRtcVideoEngine2::WebRtcVideoEngine2()";
+  video_codecs_ = GetSupportedCodecs(external_encoder_factory_);
 }
 
 WebRtcVideoEngine2::~WebRtcVideoEngine2() {
   LOG(LS_INFO) << "WebRtcVideoEngine2::~WebRtcVideoEngine2";
 }
 
 void WebRtcVideoEngine2::Init() {
   LOG(LS_INFO) << "WebRtcVideoEngine2::Init";
   initialized_ = true;
 }
 
 WebRtcVideoChannel2* WebRtcVideoEngine2::CreateChannel(
     webrtc::Call* call,
     const MediaConfig& config,
     const VideoOptions& options) {
   RTC_DCHECK(initialized_);
   LOG(LS_INFO) << "CreateChannel. Options: " << options.ToString();
   return new WebRtcVideoChannel2(call, config, options,
                                  external_encoder_factory_,
                                  external_decoder_factory_);
 }
 
-const std::vector<VideoCodec> WebRtcVideoEngine2::codecs() const {
-  return GetSupportedCodecs(external_encoder_factory_);
+const std::vector<VideoCodec>& WebRtcVideoEngine2::codecs() const {
+  return video_codecs_;
 }
 
 RtpCapabilities WebRtcVideoEngine2::GetCapabilities() const {
   RtpCapabilities capabilities;
   capabilities.header_extensions.push_back(
       webrtc::RtpExtension(webrtc::RtpExtension::kTimestampOffsetUri,
                            webrtc::RtpExtension::kTimestampOffsetDefaultId));
   capabilities.header_extensions.push_back(
       webrtc::RtpExtension(webrtc::RtpExtension::kAbsSendTimeUri,
                            webrtc::RtpExtension::kAbsSendTimeDefaultId));
@@ skipping 26 matching lines @@
   simulcast_encoder_factory_.reset();
 
   if (encoder_factory &&
       WebRtcSimulcastEncoderFactory::UseSimulcastEncoderFactory(
           encoder_factory->supported_codecs())) {
     simulcast_encoder_factory_.reset(
         new WebRtcSimulcastEncoderFactory(encoder_factory));
     encoder_factory = simulcast_encoder_factory_.get();
   }
   external_encoder_factory_ = encoder_factory;
+
+  video_codecs_ = GetSupportedCodecs(encoder_factory);
 }
 
 static std::vector<VideoCodec> GetSupportedCodecs(
     const WebRtcVideoEncoderFactory* external_encoder_factory) {
   std::vector<VideoCodec> supported_codecs = DefaultVideoCodecList();
 
   if (external_encoder_factory == nullptr) {
     LOG(LS_INFO) << "Supported codecs: "
                  << CodecVectorToString(supported_codecs);
     return supported_codecs;
@@ skipping 1945 matching lines @@
         rtx_mapping[video_codecs[i].codec.id] !=
             ulpfec_config.red_payload_type) {
       video_codecs[i].rtx_payload_type = rtx_mapping[video_codecs[i].codec.id];
     }
   }
 
   return video_codecs;
 }
 
 }  // namespace cricket