If I didn't miss something this just replaces - depending on the quality setting - the least significant 2, 4 or 8 bits of every 16 bit sample with the data to

If I didn't miss something this just replaces - depending on the quality setting - the least significant 2, 4 or 8 bits of every 16 bit sample with the data to be hidden. This is trivial to detect and will not survive any lossy compression.