most common technique is a spectral encoding, which can be quite resistant to degradation. here's some old (ugly) code - quite short as you can see: - encodin

most common technique is a spectral encoding, which can be quite resistant to degradation. here's some old (ugly) code - quite short as you can see: - encoding: https://github.com/jcelerier/libaudiotool/blob/master/src/libwatermark/watermark/SSWEncode.h#L43 https://github.com/jcelerier/libaudiotool/blob/master/src/li... - decoding: https://github.com/jcelerier/libaudiotool/blob/master/src/libwatermark/watermark/SSWDecode.h#L46 https://github.com/jcelerier/libaudiotool/blob/master/src/li...