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GRC library version 3.1
This file is part of Open Sound System.
Copyright (C) 4Front Technologies 1996-2008.
This this source file is released under GPL v2 license (no other versions). See the COPYING file included in the main directory of this source distribution for the license terms and conditions.
static __inline__ int32_t SUFFIX (grc3_upsample_) (grc3state_t * grc,
TYPEIN * src,
TYPEOUT * dst, uint32_t sz,
uint32_t bufsz,
int32_t inc,
int32_t offset)
{
GRCvreg uint32_t ptr = grc->ptr;
uint32_t srcrate = grc->srcrate;
uint32_t dstrate = grc->dstrate;
GRCvreg int32_t *history = grc->historyptr;
uint32_t filtfactor = grc->filtfactor;
uint32_t dstsz = 0;
grc->insz = sz;
src += offset;
dst += offset;
while (sz > 0)
{
while (ptr < dstrate)
{
if (dstsz >= bufsz)
goto endloop;
OUT (dst[0],
DOCLAMP (QSUFFIX (_conv31_)
(history, _grc_sat6 (ptr, filtfactor))));
ptr += srcrate;
#ifndef INCOUT
dst += inc;
#else
INCOUT
#endif
dstsz++;
}
history++;
if (history >= (grc->history + GRC3_MAXHISTORY * 2))
history -= GRC3_MAXHISTORY;
history[0] = history[-GRC3_MAXHISTORY] = IN (((*src)));
ptr -= dstrate;
sz--;
#ifndef INCIN
src += inc;
#else
INCIN
#endif
}
endloop:
grc->ptr = ptr;
grc->historyptr = history;
grc->outsz = dstsz;
grc->insz -= sz;
return (int32_t) dstsz;
}
__inline__ int32_t SUFFIX (grc3_dnsample_) (grc3state_t * grc, TYPEIN * src,
TYPEOUT * dst, uint32_t sz,
uint32_t bufsz, int32_t inc,
int32_t offset)
{
GRCvreg uint32_t ptr = grc->ptr;
uint32_t srcrate = grc->srcrate;
uint32_t dstrate = grc->dstrate;
uint32_t sat = grc->sat;
GRCvreg int32_t *history = grc->historyptr;
uint32_t filtfactor = grc->filtfactor;
uint32_t dstsz = 0;
grc->insz = sz;
src += offset;
dst += offset;
while (sz > 0)
{
while (ptr >= srcrate)
{
if (dstsz >= bufsz)
goto endloop;
ptr -= srcrate;
OUT (dst[0],
DOCLAMP (QSUFFIX (_conv31d_)
(history, _grc_sat6 (ptr, filtfactor),
grc->ptr_incv)));
#ifndef INCOUT
dst += inc;
#else
INCOUT
#endif
dstsz++;
}
history++;
if (history >= (grc->history + GRC3_MAXHISTORY * 2))
history -= GRC3_MAXHISTORY;
/* TODO: for better quality multiplier is worth moving to output cascade */
history[0] = history[-GRC3_MAXHISTORY] =
_grc_sat31 (IN (((*src))), sat);
ptr += dstrate;
sz--;
#ifndef INCIN
src += inc;
#else
INCIN
#endif
}
endloop:
grc->ptr = ptr;
grc->historyptr = history;
grc->outsz = dstsz;
grc->insz -= sz;
return (int32_t) dstsz;
}
static __inline__ int32_t SUFFIX (grc3_resample_) (grc3state_t * grc,
void *src, void *dst,
uint32_t sz,
uint32_t bufsz,
int32_t inc,
int32_t offset)
{
if (grc->srcrate <= grc->dstrate)
return SUFFIX (grc3_upsample_) (grc, (TYPEIN *) src, (TYPEOUT *) dst, sz,
bufsz, inc, offset);
else
return SUFFIX (grc3_dnsample_) (grc, (TYPEIN *) src, (TYPEOUT *) dst, sz,
bufsz, inc, offset);
}
#undef TYPEIN
#undef TYPEOUT
#undef INCIN
#undef INCOUT
#undef SUFFIX
#undef IN
#undef OUT