Adding codecs to the RtpParameters returned by an RtpSender.

webrtc/api/rtpparameters.h

Index: webrtc/api/rtpparameters.h
diff --git a/webrtc/api/rtpparameters.h b/webrtc/api/rtpparameters.h
index 2c29d9843d9ee597c81e313e2476f05344065b40..50860d12e53a54ce91656cae2d64879227465081 100644
--- a/webrtc/api/rtpparameters.h
+++ b/webrtc/api/rtpparameters.h
@@ -11,6 +11,7 @@
 #ifndef WEBRTC_API_RTPPARAMETERS_H_
 #define WEBRTC_API_RTPPARAMETERS_H_
 
+#include <string>
 #include <vector>
 
 namespace webrtc {
@@ -22,8 +23,17 @@ struct RtpEncodingParameters {
   int max_bitrate_bps = -1;
 };
 
+struct RtpCodecParameters {
+  int payload_type;
+  std::string mime_type;
+  int clock_rate;
+  int channels = 1;
+  // TODO(deadbeef): Add sdpFmtpLine field.
+};
+
 struct RtpParameters {
   std::vector<RtpEncodingParameters> encodings;
+  std::vector<RtpCodecParameters> codecs;
 };
 
 }  // namespace webrtc