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/*
author: unknown, probably bitmaster?
slightly modified by dbalster
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "xadecode.h"
#if USE_FXD
static FXD K0[4] = {
0x00000000,
0x0000F000,
0x0001CC00,
0x00018800
};
static FXD K1[4] = {
0x00000000,
0x00000000,
0xFFFF3000,
0xFFFF2400
};
FXD t1, t2, at1[256], at2[256];
FXD t1_x, t2_x, at1_x[256], at2_x[256];
#else
static double K0[4] = {
0.0,
0.9375,
1.796875,
1.53125
};
static double K1[4] = {
0.0,
0.0,
-0.8125,
-0.859375
};
double t1, t2, at1[256], at2[256];
double t1_x, t2_x, at1_x[256], at2_x[256];
#endif
void initXaDecode(void)
{
int i;
for (i=0; i<256; ++i)
{
at1[i] = at2[i] = at1_x[i] = at2_x[i] = 0;
}
}
void reinitXaDecode(int i)
{
at1[i] = at2[i] = at1_x[i] = at2_x[i] = 0;
}
void switchXaDecode(int i)
{
t1 = at1[i];
t2 = at2[i];
t1_x = at1_x[i];
t2_x = at2_x[i];
}
void saveXaDecode(int i)
{
at1[i] = t1;
at2[i] = t2;
at1_x[i]= t1_x;
at2_x[i]= t2_x;
}
char xachannel(SoundSector *ss)
{
return(ss->sectorFiller[XAChannel]);
}
unsigned char xatype(SoundSector *ss)
{
return(unsigned char) (ss->sectorFiller[XAType]);
}
char xafileno(SoundSector *ss)
{
return(ss->sectorFiller[XAFile]);
}
char xastereo(SoundSector *ss)
{
return(ss->sectorFiller[XAFlags]&XAFStereo);
}
char xahalfhz(SoundSector *ss)
{
return(ss->sectorFiller[XAFlags]&XAFHalfHz);
}
long convXaToWave(char *adp, char *wav, int cn, int fn_s, int fn_e)
{
SoundSector ssct;
int i;
memcpy(ssct.sectorFiller,adp,sizeof(ssct.sectorFiller));
for(i=0;i<18;i++)
memcpy(ssct.SoundGroups[i],adp+sizeof(ssct.sectorFiller)+(128*i),128);
if ((xachannel(&ssct) == cn) && (xatype(&ssct) == XAAUDIO))
{
if (xafileno(&ssct) >= fn_s
&& xafileno(&ssct) <= fn_e)
{
if (xastereo(&ssct))
return(decodeSoundSect1(&ssct, wav));
else
return(decodeSoundSect(&ssct, wav));
}
}
return(0);
}
long decodeSoundSect(SoundSector *ssct, char *wav)
{
long count, outputBytes;
signed char snddat, filt, range;
short decoded;
long unit, sample;
long sndgrp;
#if USE_FXD
FXD tmp2, tmp3, tmp4, tmp5;
#else
double tmp2, tmp3, tmp4, tmp5;
#endif
outputBytes = 0;
for (sndgrp = 0; sndgrp < kNumOfSGs; sndgrp++)
{
count = 0;
for (unit = 0; unit < 8; unit++)
{
range = getRange(ssct->SoundGroups[sndgrp], unit);
filt = getFilter(ssct->SoundGroups[sndgrp], unit);
for (sample = 0; sample < 28; sample++)
{
snddat = getSoundData(ssct->SoundGroups[sndgrp], unit, sample);
#if USE_FXD
tmp2 = (long)(snddat) << (12 - range);
tmp3 = FXD_Pcm16ToFxd(tmp2);
tmp4 = FXD_FixMul(K0[filt], t1);
tmp5 = FXD_FixMul(K1[filt], t2);
t2 = t1;
t1 = tmp3 + tmp4 + tmp5;
decoded = FXD_FxdToPcm16(t1);
#else
tmp2 = (double)(1 << (12 - range));
tmp3 = (double)snddat * tmp2;
tmp4 = t1 * K0[filt];
tmp5 = t2 * K1[filt];
t2 = t1;
t1 = tmp3 + tmp4 + tmp5;
decoded = DblToPCM(t1);
#endif
wav[outputBytes+count++] = (char)(decoded & 0x0000ffff);
wav[outputBytes+count++] = (char)(decoded >> 8);
}
}
outputBytes += count;
}
return outputBytes;
}
long decodeSoundSect1(SoundSector *ssct, char *wav)
{
long count, outputBytes;
signed char snddat, filt, range;
signed char filt1, range1;
short decoded;
long unit, sample;
long sndgrp;
#if USE_FXD
FXD tmp2, tmp3, tmp4, tmp5;
#else
double tmp2, tmp3, tmp4, tmp5;
#endif
outputBytes = 0;
for (sndgrp = 0; sndgrp < kNumOfSGs; sndgrp++)
{
count = 0;
for (unit = 0; unit < 8; unit+= 2)
{
range = getRange(ssct->SoundGroups[sndgrp], unit);
filt = getFilter(ssct->SoundGroups[sndgrp], unit);
range1 = getRange(ssct->SoundGroups[sndgrp], unit+1);
filt1 = getFilter(ssct->SoundGroups[sndgrp], unit+1);
for (sample = 0; sample < 28; sample++)
{
/* Channel 1 */
snddat = getSoundData(ssct->SoundGroups[sndgrp], unit, sample);
#if USE_FXD
tmp2 = (long)(snddat) << (12 - range);
tmp3 = FXD_Pcm16ToFxd(tmp2);
tmp4 = FXD_FixMul(K0[filt], t1);
tmp5 = FXD_FixMul(K1[filt], t2);
t2 = t1;
t1 = tmp3 + tmp4 + tmp5;
decoded = FXD_FxdToPcm16(t1);
#else
tmp2 = (double)(1 << (12 - range));
tmp3 = (double)snddat * tmp2;
tmp4 = t1 * K0[filt];
tmp5 = t2 * K1[filt];
t2 = t1;
t1 = tmp3 + tmp4 + tmp5;
decoded = DblToPCM(t1);
#endif
wav[outputBytes + count++] = (char)(decoded & 0x0000ffff);
wav[outputBytes + count++] = (char)(decoded >> 8);
/* Channel 2 */
snddat = getSoundData(ssct->SoundGroups[sndgrp], unit+1, sample);
#if USE_FXD
tmp2 = (long)(snddat) << (12 - range1);
tmp3 = FXD_Pcm16ToFxd(tmp2);
tmp4 = FXD_FixMul(K0[filt1], t1_x);
tmp5 = FXD_FixMul(K1[filt1], t2_x);
t2_x = t1_x;
t1_x = tmp3 + tmp4 + tmp5;
decoded = FXD_FxdToPcm16(t1_x);
#else
tmp2 = (double)(1 << (12 - range1));
tmp3 = (double)snddat * tmp2;
tmp4 = t1_x * K0[filt1];
tmp5 = t2_x * K1[filt1];
t2_x = t1_x;
t1_x = tmp3 + tmp4 + tmp5;
decoded = DblToPCM(t1_x);
#endif
wav[outputBytes + count++] = (char)(decoded & 0x0000ffff);
wav[outputBytes + count++] = (char)(decoded >> 8);
}
}
outputBytes += count;
}
return outputBytes;
}
signed char getSoundData(char *buf, long unit, long sample)
{
signed char ret;
char *p;
long offset, shift;
p = buf;
shift = (unit%2) * 4;
offset = 16 + (unit / 2) + (sample * 4);
p += offset;
ret = (*p >> shift) & 0x0F;
if (ret > 7) {
ret -= 16;
}
return ret;
}
signed char getFilter(char *buf, long unit)
{
return (*(buf + 4 + unit) >> 4) & 0x03;
}
signed char getRange(char *buf, long unit)
{
return *(buf + 4 + unit) & 0x0F;
}
#if USE_FXD
FXD FXD_FixMul(FXD a, FXD b)
{
long high_a, low_a, high_b, low_b;
long hahb, halb, lahb;
unsigned long lalb;
FXD ret;
high_a = a >> 16;
low_a = a & 0x0000FFFF;
high_b = b >> 16;
low_b = b & 0x0000FFFF;
hahb = (high_a * high_b) << 16;
halb = high_a * low_b;
lahb = low_a * high_b;
lalb = (unsigned long)(low_a * low_b) >> 16;
ret = hahb + halb + lahb + lalb;
return ret;
}
#endif
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