Adding C++ versions of currently spec'd "RtpParameters" structs.

webrtc/media/base/codec.cc

Index: webrtc/media/base/codec.cc
diff --git a/webrtc/media/base/codec.cc b/webrtc/media/base/codec.cc
index 75e5a7bf71d7574f203a63c659ece7b86b75135c..1e305a60b71369e41b797e6b388f15b33f0f7438 100644
--- a/webrtc/media/base/codec.cc
+++ b/webrtc/media/base/codec.cc
@@ -149,8 +149,8 @@ void Codec::IntersectFeedbackParams(const Codec& other) {
 webrtc::RtpCodecParameters Codec::ToCodecParameters() const {
   webrtc::RtpCodecParameters codec_params;
   codec_params.payload_type = id;
-  codec_params.mime_type = name;
-  codec_params.clock_rate = clockrate;
+  codec_params.name = name;
+  codec_params.clock_rate = rtc::Optional<int>(clockrate);
   return codec_params;
 }
 
@@ -190,12 +190,6 @@ bool AudioCodec::Matches(const AudioCodec& codec) const {
       ((codec.channels < 2 && channels < 2) || channels == codec.channels);
 }
 
-webrtc::RtpCodecParameters AudioCodec::ToCodecParameters() const {
-  webrtc::RtpCodecParameters codec_params = Codec::ToCodecParameters();
-  codec_params.channels = static_cast<int>(channels);
-  return codec_params;
-}
-
 std::string AudioCodec::ToString() const {
   std::ostringstream os;
   os << "AudioCodec[" << id << ":" << name << ":" << clockrate << ":" << bitrate
@@ -203,12 +197,25 @@ std::string AudioCodec::ToString() const {
   return os.str();
 }
 
+webrtc::RtpCodecParameters AudioCodec::ToCodecParameters() const {
+  webrtc::RtpCodecParameters codec_params = Codec::ToCodecParameters();
+  codec_params.num_channels = rtc::Optional<int>(static_cast<int>(channels));
+  codec_params.kind = MEDIA_TYPE_AUDIO;
+  return codec_params;
+}
+
 std::string VideoCodec::ToString() const {
   std::ostringstream os;
   os << "VideoCodec[" << id << ":" << name << "]";
   return os.str();
 }
 
+webrtc::RtpCodecParameters VideoCodec::ToCodecParameters() const {
+  webrtc::RtpCodecParameters codec_params = Codec::ToCodecParameters();
+  codec_params.kind = MEDIA_TYPE_VIDEO;
+  return codec_params;
+}
+
 VideoCodec::VideoCodec(int id, const std::string& name)
     : Codec(id, name, kVideoCodecClockrate) {
   SetDefaultParameters();