CDDA sources use this function from their start vfunc to announce the
available data and audio tracks to the base source class. The caller
should allocate track on the stack, the base source will do a shallow
copy of the structure (and take ownership of the taglist if there is one).
CDDA sources use this function from their start vfunc to announce the available data and audio tracks to the base source class. The caller should allocate track on the stack, the base source will do a shallow copy of the structure (and take ownership of the taglist if there is one).