internal static void ec_laplace_encode(EntropyCoder enc, ref int value, uint fs, int decay)
{
uint fl;
int val = value;
fl = 0;
if (val != 0)
{
int s;
int i;
s = 0 - (val < 0 ? 1 : 0);
val = (val + s) ^ s;
fl = fs;
fs = ec_laplace_get_freq1(fs, decay);
/* Search the decaying part of the PDF.*/
for (i = 1; fs > 0 && i < val; i++)
{
fs *= 2;
fl += fs + 2 * LAPLACE_MINP;
fs = (uint)((fs * (int)decay) >> 15);
}
/* Everything beyond that has probability LAPLACE_MINP. */
if (fs == 0)
{
int di;
int ndi_max;
ndi_max = (int)(32768 - fl + LAPLACE_MINP - 1) >> LAPLACE_LOG_MINP;
ndi_max = (ndi_max - s) >> 1;
di = Inlines.IMIN(val - i, ndi_max - 1);
fl += (uint)(2 * di + 1 + s) * LAPLACE_MINP;
fs = Inlines.IMIN(LAPLACE_MINP, 32768 - fl);
value = (i + di + s) ^ s;
}
else
{
fs += LAPLACE_MINP;
fl += (uint)(fs & ~s);
}
Inlines.OpusAssert(fl + fs <= 32768);
Inlines.OpusAssert(fs > 0);
}
enc.encode_bin(fl, fl + fs, 15);
}
