Optional
channelchannel mode e.g. stereo, mono, single
number of channels
duration in milliseconds
analyzed filename
name of format e.g. "MPEG 1 (ISO/IEC 11172-3) MPEG audio layer 3"
number of audio frames
Optional
headertype of head audio frame e.g. "Info" or "XING"
has id3v1
has id3v2
bitrate mode e.g. CBR (constant), VBR (variable)
tags data
array of warnings
bitrate (average if bitrate mode is variable)