It is my belief that the main CPU power is used for the multi-channel sample rate conversion and stereo down-mix.
At first glance the VS1063 doesn't have capabilities to accelerate these functions.
All I can gleam from the datasheet (with respect to sound output) is :
1) Digital compressed stereo in -> Decompressed -> Analog Stereo Out.
2) Digital uncompressed stereo in -> Analog stereo out.
It has a very limited digital pcm mixer which can overlay sideband mono 16-bit digital uncompressed PCM over whatever you're processing mainband. Possibly usable for SFX over music.
Last edited by alexh; 06 March 2014 at 17:45.