< Artist string (pointer into text_list).
< Title string (pointer into text_list).
< Genre String (pointer into text_list). The genre string(s) may very well need postprocessing, esp. for ID3v2.3.
< Pointer to last encountered comment text with empty description.
< Array of comments.
< Numer of text fields.
< The array of extra (TXXX) fields.
< The year as a string (pointer into text_list).
< Number of extra text (TXXX) fields.
< Array of ID3v2 pictures fields (APIC).
< Number of comments.
< Array of ID3v2 text fields (including USLT)
< 3 or 4 for ID3v2.3 or ID3v2.4.
< Album string (pointer into text_list).
Data structure for storing IDV3v2 tags. * This structure is not a direct binary mapping with the file contents. * The ID3v2 text frames are allowed to contain multiple strings. * So check for null bytes until you reach the mpg123_string fill. * All text is encoded in UTF-8.