Rockbox

Here we slice up PCM frames into about 1/20s chunks. Codecs set elapsed times and offset before the next PCM insert which associates those values with the audio data it subsequently commits to the buffer.

Codecs are modified only minimally so that they set elapsed/offset before outputting anything.

Why?

* Accurate position reporting of samples, especially when using the time index in an uncoventional way (as a sub-track indicator for instance).

* Timing is accurate through track duration regarless of pitch changes.

Now, this is still pretty prelimary. There will likely be short time-reporting glitches in the WPS when switching tracks. Crossfade is not properly converted so don't use it here!

I don't want to invest too much into the current way of doing mixing to accomodate a new buffer format. I'd like  FS#12150  in first before making changes to the format.

Primarily I put this up early so that videogame music enthusiasts can enjoy the benefits.