code: function convertToCodecDefinition(r, line) {
      if (!line || line[0] !== 'a') return r;
  
      var result = reRtpMap.exec(line[1]);
      if (!result) return r;
  
      // Build the codec definition
      var codec = result[2];
      var typeNum = result[1];
      r[codec.toUpperCase()] = {
        num: typeNum,
        codec: codec
      }
      return r;
    }
docs: Converts rtpmap definitions to a codec lookup object