unsigned int get_freq_from_period(int period, int linear)
{
if (period <= 0)
return INT_MAX;
else if (linear)
return period;
else
return _muldiv(8363, 1712L << 8, (period << 8));
}
BOOL CSoundFile::CanPackSample(LPSTR pSample, UINT nLen, UINT nPacking, BYTE *result)
//-----------------------------------------------------------------------------------
{
int pos, old, oldpos, besttable = 0;
DWORD dwErr, dwTotal, dwResult;
int i,j;
if (result) *result = 0;
if ((!pSample) || (nLen < 1024)) return FALSE;
// Try packing with different tables
dwResult = 0;
for (j=1; j<MAX_PACK_TABLES; j++)
{
memcpy(CompressionTable, UnpackTable[j], 16);
dwErr = 0;
dwTotal = 1;
old = pos = oldpos = 0;
for (i=0; i<(int)nLen; i++)
{
int s = (int)pSample[i];
PackSample(pos, s);
dwErr += abs(pos - oldpos);
dwTotal += abs(s - old);
old = s;
oldpos = pos;
}
dwErr = _muldiv(dwErr, 100, dwTotal);
if (dwErr >= dwResult)
{
dwResult = dwErr;
besttable = j;
}
}
memcpy(CompressionTable, UnpackTable[besttable], 16);
if (result)
{
if (dwResult > 100) *result = 100; else *result = (BYTE)dwResult;
}
return (dwResult >= nPacking) ? TRUE : FALSE;
}
static inline int rn_vibrato(song_t *csf, song_voice_t *chan, int period)
{
unsigned int vibpos = chan->vibrato_position & 0xFF;
int vdelta;
unsigned int vdepth;
switch (chan->vib_type) {
case VIB_SINE:
default:
vdelta = sine_table[vibpos];
break;
case VIB_RAMP_DOWN:
vdelta = ramp_down_table[vibpos];
break;
case VIB_SQUARE:
vdelta = square_table[vibpos];
break;
case VIB_RANDOM:
vdelta = 128 * ((double) rand() / RAND_MAX) - 64;
break;
}
if (csf->flags & SONG_ITOLDEFFECTS) {
vdepth = 5;
vdelta = -vdelta; // yes, IT does vibrato backwards in old-effects mode. try it.
} else {
vdepth = 6;
}
vdelta = (vdelta * (int)chan->vibrato_depth) >> vdepth;
if (csf->flags & SONG_LINEARSLIDES) {
int l = abs(vdelta);
if (vdelta < 0) {
vdelta = _muldiv(period, linear_slide_up_table[l >> 2], 0x10000) - period;
if (l & 0x03)
vdelta += _muldiv(period, fine_linear_slide_up_table[l & 0x03], 0x10000) - period;
} else {