I couldn't find a better way so I was doing this previously:
CODE
bool vbr = (info->info_exists("extrainfo") && !stricmp_utf8(info->info_get("extrainfo"), "VBR")) ? true : false;
Now, obviously this is broken with 0.9.4 and I would like to know which way to do it that isn't susceptible to breaking in the future. I am only interested in checking this for MP3s.