Add logging of supported video codecs.

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 612 matching lines @@
   }
   external_encoder_factory_ = encoder_factory;
 
   video_codecs_ = GetSupportedCodecs();
 }
 
 std::vector<VideoCodec> WebRtcVideoEngine2::GetSupportedCodecs() const {
   std::vector<VideoCodec> supported_codecs = DefaultVideoCodecList();
 
   if (external_encoder_factory_ == NULL) {
+    LOG(LS_INFO) << "Supported codecs: "
+                 << CodecVectorToString(supported_codecs);
     return supported_codecs;
   }
 
+  std::stringstream out;
   const std::vector<WebRtcVideoEncoderFactory::VideoCodec>& codecs =
       external_encoder_factory_->codecs();
   for (size_t i = 0; i < codecs.size(); ++i) {
+    out << codecs[i].name;
+    if (i != codecs.size() - 1) {
+      out << ", ";
+    }
     // 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);
 
     AddDefaultFeedbackParams(&codec);
     supported_codecs.push_back(codec);
   }
+  LOG(LS_INFO) << "Supported codecs (incl. external codecs): "
+               << CodecVectorToString(supported_codecs);
+  LOG(LS_INFO) << "Codecs supported by the external encoder factory: "
+               << out.str();
   return supported_codecs;
 }
 
 WebRtcVideoChannel2::WebRtcVideoChannel2(
     webrtc::Call* call,
     const MediaConfig& config,
     const VideoOptions& options,
     const std::vector<VideoCodec>& recv_codecs,
     WebRtcVideoEncoderFactory* external_encoder_factory,
     WebRtcVideoDecoderFactory* external_decoder_factory)
@@ skipping 1910 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