AudioMetaData audio = (AudioMetaData) variant.getMetaData();
// Currently this audio tag is only supported by the MMS_SMIL_2_0
// protocol. This only suports AMR so we need only deal with
// assets that have AMR encoding.
AudioEncoding encoding = audio.getAudioEncoding();
if (encoding == AudioEncoding.AMR) {
doAMR(selected, attributes, protocol, pageContext);
if (logger.isDebugEnabled()) {
logger.debug("Done a Audio tag");
}