Get the percentage of buffered data. This is a value between 0 and 100. The busy indicator is TRUE when the buffering is in progress.
if buffering is busy, or NULL. out[allow-none]
a buffering percent, or NULL. out[allow-none]
See Implementation
Get the percentage of buffered data. This is a value between 0 and 100. The busy indicator is TRUE when the buffering is in progress.