P6* - The Player

asle · Post by **asle** » Mon Mar 24, 2003 4:11 pm

Hey XtC,

Do you have a similar description on how to depack P60a and P61a samples ?. Would be Very cool

. err .. C example only as that's the only thing I'm able to read

.

Thanks,
Regards,
Sylvain

XtC · Post by **XtC** » Mon Mar 24, 2003 4:23 pm

I think it's Kyz(er) who you should be asking.

I wouldn't know how to decompress in an oxygen chamber, never mind unpack a delta compressed sample file!

asle · Post by **asle** » Mon Mar 24, 2003 5:16 pm

ah .. hum, well, Kyz ?

Sylvain

kyz · Post by **kyz** » Mon Mar 24, 2003 5:49 pm

asle wrote:ah .. hum, well, Kyz ?

Sylvain

P50 / P60 / P61's delta-4 coding is as follows:

Code: Select all

        BYTE *src, *dest, *src_end, samp;
        BYTE table[16] = {0,1,2,4,8,16,32,64,128,-64,-32,-16,-8,-4,-2,-1}
        for (samp = 0; src < src_end; src++) {
          samp -= table[(*src >> 4) & 0x0F]; *dest++ = samp;
          samp -= table[ *src       & 0x0F]; *dest++ = samp;
        }