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ssrc.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include <time.h>
#include "dither.h"
#include "sleefdft.h"
#define VERSION "1.33"
#ifndef HIGHPREC
typedef float REAL;
double AA=140;
double DF=2000;
#define M 30
#else
typedef double REAL;
double AA=150;
double DF=200;
#define M 30
#endif
#define MAXNCH 10
#ifndef M_PI
#define M_PI 3.1415926535897932384626433832795028842
#endif
#define RANDBUFLEN 65536
#define RINT(x) ((x) >= 0 ? ((int)((x) + 0.5)) : ((int)((x) - 0.5)))
double fact[M+1];
static inline void ignoreReturnValue(int x) {}
int quiet = 0;
int lastshowed2;
time_t starttime, lastshowed;
struct SSRCDither *shaper[MAXNCH];
int do_shaping(double s, double *peak, int dtype, int ch) {
int ret;
SSRCDither_quantizeDouble(shaper[ch], &ret, &s, 1, 1.0);
return ret;
}
double alpha(double a)
{
if (a <= 21) return 0;
if (a <= 50) return 0.5842*pow(a-21,0.4)+0.07886*(a-21);
return 0.1102*(a-8.7);
}
double izero(double x) {
double ret = 1;
int m;
for(m=M;m>=1;m--) {
double t = pow(x/2, m)/fact[m];
ret += t*t;
}
return ret;
}
double win(double n,int len,double alp,double iza)
{
return izero(alp*sqrt(1-4*n*n/((len-1.0)*(len-1.0))))/iza;
}
double sinc(double x)
{
return x == 0 ? 1 : sin(x)/x;
}
double hn_lpf(int n,double lpf,double fs)
{
double t = 1/fs;
double omega = 2*M_PI*lpf;
return 2*lpf*t*sinc(n*omega*t);
}
void usage(void)
{
printf("http://shibatch.sourceforge.net/\n\n");
printf("usage: ssrc [<options>] <source wav file> <destination wav file>\n");
printf("options : --rate <sampling rate> output sample rate\n");
printf(" --att <attenuation(dB)> attenuate signal\n");
printf(" --bits <number of bits> output quantization bit length\n");
printf(" --tmpfile <file name> specify temporal file\n");
printf(" --twopass two pass processing to avoid clipping\n");
printf(" --normalize normalize the wave file\n");
printf(" --quiet nothing displayed except error\n");
printf(" --dither [<type>] dither options\n");
printf(" 0 : ATH-based noise shaping, low intensity\n");
printf(" 2 : ATH-based noise shaping, mid intensity\n");
printf(" 6 : ATH-based noise shaping, high intensity\n");
printf(" 99 : No noise shaping\n");
printf(" help : Show all available noise shapers\n");
printf(" --pdf <type> [<amp>] select p.d.f. of noise\n");
printf(" 0 : Rectangular\n");
printf(" 1 : Triangular\n");
//printf(" 2 : Gaussian\n");
printf(" 3 : Two-level (experimental)\n");
printf(" --profile <type> specify profile\n");
printf(" short : shorter filter length\n");
printf(" normal : the default quality\n");
printf(" long : longer filter length\n");
}
void fmterr(int x)
{
fprintf(stderr,"unknown error %d\n",x);
exit(-1);
}
void setstarttime(void)
{
starttime = time(NULL);
lastshowed = 0;
lastshowed2 = -1;
}
void showprogress(double p)
{
int eta,pc;
time_t t;
if (quiet) return;
t = time(NULL)-starttime;
if (p == 0) eta = 0; else eta = t*(1-p)/p;
pc = (int)(p*100);
if (pc != lastshowed2 || t != lastshowed) {
printf(" %3d%% processed",pc);
lastshowed2 = pc;
}
if(t != lastshowed) {
printf(", ETA =%4dsec",eta);
lastshowed = t;
}
printf("\r");
fflush(stdout);
}
int64_t gcd(int64_t x, int64_t y)
{
int64_t t;
while (y != 0) {
t = x % y; x = y; y = t;
}
return x;
}
double upsample(FILE *fpi,FILE *fpo,int nch,int bps,int dbps,int64_t sfrq,int64_t dfrq,double gain,unsigned int chunklen,int twopass,int dither)
{
int64_t frqgcd,osf;
int64_t fs1, fs2, n2;
int64_t n1,n1x,n1y,n2b;
REAL **stage1,*stage2;
int filter2len;
int *f1order,*f1inc;
struct SleefDFT *dftf = NULL, *dftb = NULL;
uint8_t *rawinbuf,*rawoutbuf;
REAL *inbuf,*outbuf;
REAL **buf1,**buf2;
double peak=0;
int spcount = 0;
int i,j;
filter2len = 1; /* stage 2 filter length */
/* Make stage 1 filter */
{
double aa = AA; /* stop band attenuation(dB) */
double lpf,delta,d,df,alp,iza;
double guard = 2;
frqgcd = gcd(sfrq,dfrq);
fs1 = (int64_t)sfrq / frqgcd * dfrq;
if (fs1/dfrq == 1) osf = 1;
else if (fs1/dfrq % 2 == 0) osf = 2;
else if (fs1/dfrq % 3 == 0) osf = 3;
else {
fprintf(stderr,"Resampling from %dHz to %dHz is not supported.\n",(int)sfrq, (int)dfrq);
fprintf(stderr,"%d/gcd(%d,%d)=%d must be divided by 2 or 3.\n",(int)sfrq,(int)sfrq,(int)dfrq,(int)(fs1/dfrq));
exit(-1);
}
df = (dfrq*osf/2 - sfrq/2) * 2 / guard;
lpf = sfrq/2 + (dfrq*osf/2 - sfrq/2)/guard;
delta = pow(10,-aa/20);
if (aa <= 21) d = 0.9222; else d = (aa-7.95)/14.36;
n1 = fs1/df*d+1;
if (n1 % 2 == 0) n1++;
alp = alpha(aa);
iza = izero(alp);
n1y = fs1/sfrq;
n1x = n1/n1y+1;
f1order = calloc(n1y*osf,sizeof(int));
for(i=0;i<n1y*osf;i++) {
f1order[i] = fs1/sfrq-(i*(fs1/(dfrq*osf)))%(fs1/sfrq);
if (f1order[i] == fs1/sfrq) f1order[i] = 0;
}
f1inc = calloc(n1y*osf,sizeof(int));
for(i=0;i<n1y*osf;i++) {
f1inc[i] = f1order[i] < fs1/(dfrq*osf) ? nch : 0;
}
stage1 = malloc(n1y*sizeof(REAL *));
stage1[0] = calloc(n1x*n1y,sizeof(REAL));
for(i=1;i<n1y;i++) {
stage1[i] = &(stage1[0][n1x*i]);
for(j=0;j<n1x;j++) stage1[i][j] = 0;
}
for(i=-(n1/2);i<=n1/2;i++)
{
stage1[(i+n1/2)%n1y][(i+n1/2)/n1y] = win(i,n1,alp,iza)*hn_lpf(i,lpf,fs1)*fs1/sfrq;
}
}
/* Make stage 2 filter */
{
double aa = AA; /* stop band attenuation(dB) */
double lpf,delta,d,df,alp,iza;
int ipsize,wsize;
delta = pow(10,-aa/20);
if (aa <= 21) d = 0.9222; else d = (aa-7.95)/14.36;
fs2 = (int64_t)dfrq*osf;
for(i=1;;i = i * 2)
{
n2 = filter2len * i;
if (n2 % 2 == 0) n2--;
df = (fs2*d)/(n2-1);
lpf = sfrq/2;
if (df < DF) break;
}
alp = alpha(aa);
iza = izero(alp);
for(n2b=1;n2b<n2;n2b*=2);
n2b *= 2;
stage2 = SleefDFT_malloc(n2b * sizeof(REAL));
for(i=-(n2/2);i<=n2/2;i++) {
stage2[i+n2/2] = win(i,n2,alp,iza)*hn_lpf(i,lpf,fs2)/n2b*2;
}
dftf = SleefDFT_init(SLEEF_MODE_REAL | SLEEF_MODE_ALT | SLEEF_MODE_FORWARD , n2b);
dftb = SleefDFT_init(SLEEF_MODE_REAL | SLEEF_MODE_ALT | SLEEF_MODE_BACKWARD, n2b);
SleefDFT_execute(dftf, stage2, stage2);
}
/* Apply filters */
setstarttime();
{
int n2b2 = n2b/2;
int rp; // Position of the next sample read from inbuf at fs1
int ds; // Number of samples disposed next at sfrq
int nsmplwrt1 = 0; // Number of samples that will be sent to the stage2 filter, that is
// calculated from the actual number of samples read from the file
int nsmplwrt2 = 0; // Number of samples that will be sent to the stage2 filter, that is
// calculated from the actual number of samples read from the file
int s1p; // Residual of the number of samples output from the stage1 filter divided by (n1y * osf)
int init,ending;
int64_t sumread,sumwrite;
int osc;
REAL *ip,*ip_backup;
int s1p_backup,osc_backup;
int k,ch,p;
int inbuflen;
int delay = 0;
buf1 = malloc(nch*sizeof(REAL *));
for(i=0;i<nch;i++)
{
buf1[i] = calloc((n2b2/osf+1),sizeof(REAL));
for(j=0;j<(n2b2/osf+1);j++) buf1[i][j] = 0;
}
buf2 = malloc(sizeof(REAL *)*nch);
for(i=0;i<nch;i++) buf2[i] = SleefDFT_malloc(n2b * sizeof(REAL));
rawinbuf = calloc(nch*(n2b2+n1x+2), bps);
rawoutbuf = calloc(nch*(n2b2/osf+1), dbps);
inbuf = calloc(nch*(n2b2+n1x+2),sizeof(REAL));
outbuf = calloc(nch*(n2b2/osf+1),sizeof(REAL));
s1p = 0;
rp = 0;
ds = 0;
osc = 0;
init = 1;
ending = 0;
inbuflen = n1/2/(fs1/sfrq)+1;
delay = (double)n2/2/(fs2/dfrq);
sumread = sumwrite = 0;
for(;;)
{
int nsmplread,toberead,toberead2;
toberead2 = toberead = ceil((double)n2b2*sfrq/(dfrq*osf))+1+n1x-inbuflen;
if (toberead+sumread > chunklen) {
toberead = chunklen-sumread;
}
nsmplread = fread(rawinbuf,1,bps*nch*toberead,fpi);
nsmplread /= bps*nch;
switch(bps)
{
case 1:
for(i = 0; i < nsmplread * nch; i++)
inbuf[nch * inbuflen + i] =
(1 / (REAL)0x7f) * ((REAL)((uint8_t *)rawinbuf)[i]-128);
break;
case 2:
#ifndef BIGENDIAN
for(i=0;i<nsmplread*nch;i++)
inbuf[nch*inbuflen+i] = (1/(REAL)0x7fff)*(REAL)((int16_t *)rawinbuf)[i];
#else
for(i=0;i<nsmplread*nch;i++) {
inbuf[nch*inbuflen+i] = (1/(REAL)0x7fff)*
(((int)rawinbuf[i*2]) |
(((int)((int8_t *)rawinbuf)[i*2+1]) << 8));
}
#endif
break;
case 3:
for(i=0;i<nsmplread*nch;i++) {
inbuf[nch*inbuflen+i] = (1/(REAL)0x7fffff)*
((((int)rawinbuf[i*3 ]) << 0 ) |
(((int)rawinbuf[i*3+1]) << 8 ) |
(((int)((int8_t *)rawinbuf)[i*3+2]) << 16));
}
break;
case 4:
for(i=0;i<nsmplread*nch;i++) {
inbuf[nch*inbuflen+i] = (1/(REAL)0x7fffffff)*
((((int)rawinbuf[i*4 ]) << 0 ) |
(((int)rawinbuf[i*4+1]) << 8 ) |
(((int)rawinbuf[i*4+2]) << 16) |
(((int)((int8_t *)rawinbuf)[i*4+3]) << 24));
}
break;
}
assert(i <= nch*(n2b2+n1x+2));
for(;i<nch*toberead2;i++) inbuf[nch*inbuflen+i] = 0;
inbuflen += toberead2;
sumread += nsmplread;
ending = feof(fpi) || sumread >= chunklen;
nsmplwrt1 = n2b2;
// apply stage 1 filter
ip = &inbuf[((sfrq*(rp-1)+fs1)/fs1)*nch];
s1p_backup = s1p;
ip_backup = ip;
osc_backup = osc;
for(ch=0;ch<nch;ch++)
{
REAL *op = &outbuf[ch];
int fdo = fs1/(dfrq*osf),no = n1y*osf;
s1p = s1p_backup; ip = ip_backup+ch;
switch(n1x)
{
case 7:
for(p=0;p<nsmplwrt1;p++)
{
int s1o = f1order[s1p];
buf2[ch][p] =
stage1[s1o][0] * *(ip+0*nch)+
stage1[s1o][1] * *(ip+1*nch)+
stage1[s1o][2] * *(ip+2*nch)+
stage1[s1o][3] * *(ip+3*nch)+
stage1[s1o][4] * *(ip+4*nch)+
stage1[s1o][5] * *(ip+5*nch)+
stage1[s1o][6] * *(ip+6*nch);
ip += f1inc[s1p];
s1p++;
if (s1p == no) s1p = 0;
}
break;
case 9:
for(p=0;p<nsmplwrt1;p++)
{
int s1o = f1order[s1p];
buf2[ch][p] =
stage1[s1o][0] * *(ip+0*nch)+
stage1[s1o][1] * *(ip+1*nch)+
stage1[s1o][2] * *(ip+2*nch)+
stage1[s1o][3] * *(ip+3*nch)+
stage1[s1o][4] * *(ip+4*nch)+
stage1[s1o][5] * *(ip+5*nch)+
stage1[s1o][6] * *(ip+6*nch)+
stage1[s1o][7] * *(ip+7*nch)+
stage1[s1o][8] * *(ip+8*nch);
ip += f1inc[s1p];
s1p++;
if (s1p == no) s1p = 0;
}
break;
default:
for(p=0;p<nsmplwrt1;p++)
{
REAL tmp = 0;
REAL *ip2=ip;
int s1o = f1order[s1p];
for(i=0;i<n1x;i++)
{
tmp += stage1[s1o][i] * *ip2;
ip2 += nch;
}
buf2[ch][p] = tmp;
ip += f1inc[s1p];
s1p++;
if (s1p == no) s1p = 0;
}
break;
}
osc = osc_backup;
// apply stage 2 filter
for(p=nsmplwrt1;p<n2b;p++) buf2[ch][p] = 0;
SleefDFT_execute(dftf, buf2[ch], buf2[ch]);
buf2[ch][0] = stage2[0]*buf2[ch][0];
buf2[ch][1] = stage2[1]*buf2[ch][1];
for(i=1;i<n2b/2;i++)
{
REAL re,im;
re = stage2[i*2 ]*buf2[ch][i*2] - stage2[i*2+1]*buf2[ch][i*2+1];
im = stage2[i*2+1]*buf2[ch][i*2] + stage2[i*2 ]*buf2[ch][i*2+1];
buf2[ch][i*2 ] = re;
buf2[ch][i*2+1] = im;
}
SleefDFT_execute(dftb, buf2[ch], buf2[ch]);
for(i=osc,j=0;i<n2b2;i+=osf,j++)
{
REAL f = (buf1[ch][j] + buf2[ch][i]);
op[j*nch] = f;
}
nsmplwrt2 = j;
osc = i - n2b2;
for(j=0;i<n2b;i+=osf,j++)
buf1[ch][j] = buf2[ch][i];
}
rp += nsmplwrt1 * (sfrq / frqgcd) / osf;
if (twopass) {
for(i=0;i<nsmplwrt2*nch;i++)
{
REAL f = outbuf[i] > 0 ? outbuf[i] : -outbuf[i];
peak = peak < f ? f : peak;
((REAL *)rawoutbuf)[i] = outbuf[i];
}
} else {
switch(dbps)
{
case 1:
{
REAL gain2 = gain * (REAL)0x7f;
ch = 0;
for(i=0;i<nsmplwrt2*nch;i++)
{
int s;
if (dither != -1) {
s = do_shaping(outbuf[i]*gain2,&peak,dither,ch);
} else {
s = RINT(outbuf[i]*gain2);
if (s < -0x80) {
double d = (double)s/-0x80;
peak = peak < d ? d : peak;
s = -0x80;
}
if (0x7f < s) {
double d = (double)s/ 0x7f;
peak = peak < d ? d : peak;
s = 0x7f;
}
}
((uint8_t *)rawoutbuf)[i] = s + 0x80;
ch++;
if (ch == nch) ch = 0;
}
}
break;
case 2:
{
REAL gain2 = gain * (REAL)0x7fff;
ch = 0;
for(i=0;i<nsmplwrt2*nch;i++)
{
int s;
if (dither != -1) {
s = do_shaping(outbuf[i]*gain2,&peak,dither,ch);
} else {
s = RINT(outbuf[i]*gain2);
if (s < -0x8000) {
double d = (double)s/-0x8000;
peak = peak < d ? d : peak;
s = -0x8000;
}
if (0x7fff < s) {
double d = (double)s/ 0x7fff;
peak = peak < d ? d : peak;
s = 0x7fff;
}
}
#ifndef BIGENDIAN
((int16_t *)rawoutbuf)[i] = s;
#else
((int8_t *)rawoutbuf)[i*2 ] = s & 255; s >>= 8;
((int8_t *)rawoutbuf)[i*2+1] = s & 255;
#endif
ch++;
if (ch == nch) ch = 0;
}
}
break;
case 3:
{
REAL gain2 = gain * (REAL)0x7fffff;
ch = 0;
for(i=0;i<nsmplwrt2*nch;i++)
{
int s;
if (dither != -1) {
s = do_shaping(outbuf[i]*gain2,&peak,dither,ch);
} else {
s = RINT(outbuf[i]*gain2);
if (s < -0x800000) {
double d = (double)s/-0x800000;
peak = peak < d ? d : peak;
s = -0x800000;
}
if (0x7fffff < s) {
double d = (double)s/ 0x7fffff;
peak = peak < d ? d : peak;
s = 0x7fffff;
}
}
((int8_t *)rawoutbuf)[i*3 ] = s & 255; s >>= 8;
((int8_t *)rawoutbuf)[i*3+1] = s & 255; s >>= 8;
((int8_t *)rawoutbuf)[i*3+2] = s & 255;
ch++;
if (ch == nch) ch = 0;
}
}
break;
}
}
if (!init) {
if (ending) {
if ((double)sumread*dfrq/sfrq+2 > sumwrite+nsmplwrt2) {
if (dbps*nch*nsmplwrt2 != fwrite(rawoutbuf,1,dbps*nch*nsmplwrt2,fpo)) {
fprintf(stderr,"ERROR: -41\n");
abort();
}
sumwrite += nsmplwrt2;
} else {
if (dbps*nch*(floor((double)sumread*dfrq/sfrq)+2-sumwrite) !=
fwrite(rawoutbuf,1,dbps*nch*(floor((double)sumread*dfrq/sfrq)+2-sumwrite),fpo)) {
fprintf(stderr,"fwrite error(2).\n");
abort();
}
break;
}
} else {
if (dbps*nch*nsmplwrt2 != fwrite(rawoutbuf,1,dbps*nch*nsmplwrt2,fpo)) {
fprintf(stderr,"fwrite error(3).\n");
abort();
}
sumwrite += nsmplwrt2;
}
} else {
int pos,len;
if (nsmplwrt2 < delay) {
delay -= nsmplwrt2;
} else {
if (ending) {
if ((double)sumread*dfrq/sfrq+2 > sumwrite+nsmplwrt2-delay) {
if (dbps*nch*(nsmplwrt2-delay) != fwrite(rawoutbuf+dbps*nch*delay,1,dbps*nch*(nsmplwrt2-delay),fpo)) {
fprintf(stderr,"fwrite error(4).\n");
abort();
}
sumwrite += nsmplwrt2-delay;
} else {
if (dbps*nch*(floor((double)sumread*dfrq/sfrq)+2-sumwrite-delay) !=
fwrite(rawoutbuf+dbps*nch*delay,1,dbps*nch*(floor((double)sumread*dfrq/sfrq)+2-sumwrite-delay),fpo)) {
fprintf(stderr,"fwrite error(5).\n");
abort();
}
break;
}
} else {
if (dbps*nch*(nsmplwrt2-delay) != fwrite(rawoutbuf+dbps*nch*delay,1,dbps*nch*(nsmplwrt2-delay),fpo)) {
fprintf(stderr,"fwrite error(6).\n");
abort();
}
sumwrite += nsmplwrt2-delay;
init = 0;
}
}
}
{
int ds = (rp-1)/(fs1/sfrq);
assert(inbuflen >= ds);
memmove(inbuf,inbuf+nch*ds,sizeof(REAL)*nch*(inbuflen-ds));
inbuflen -= ds;
rp -= ds*(fs1/sfrq);
}
if ((spcount++ & 7) == 7) showprogress((double)sumread / chunklen);
}
}
showprogress(1);
free(f1order);
free(f1inc);
free(stage1[0]);
free(stage1);
SleefDFT_free(stage2);
SleefDFT_dispose(dftf);
SleefDFT_dispose(dftb);
for(i=0;i<nch;i++) free(buf1[i]);
free(buf1);
for(i=0;i<nch;i++) SleefDFT_free(buf2[i]);
free(buf2);
free(inbuf);
free(outbuf);
free(rawinbuf);
free(rawoutbuf);
if (dither != -1) {
static int64_t dlmin[] = { 0, -0x80, -0x8000, -0x800000, -0x80000000ULL };
static int64_t dlmax[] = { 0, 0x7f, 0x7fff, 0x7fffff, 0x7fffffffULL };
double min = 0, max = 0;
for(i=0;i<nch;i++) {
double p[2];
SSRCDither_getPeaks(shaper[i], p);
if (p[1] < min) min = p[1];
if (p[0] > max) max = p[0];
}
if (min < dlmin[dbps]) peak = min / dlmin[dbps];
if (max > dlmax[dbps]) peak = max / dlmax[dbps];
}
return peak;
}
double downsample(FILE *fpi,FILE *fpo,int nch,int bps,int dbps,int64_t sfrq,int64_t dfrq,double gain,unsigned int chunklen,int twopass,int dither)
{
int64_t frqgcd,osf;
int64_t fs1, fs2;
int64_t n2,n2x,n2y,n1,n1b;
REAL *stage1,**stage2;
int filter1len;
int *f2order,*f2inc;
struct SleefDFT *dftf = NULL, *dftb = NULL;
uint8_t *rawinbuf,*rawoutbuf;
REAL *inbuf,*outbuf;
REAL **buf1,**buf2;
int i,j;
int spcount = 0;
double peak=0;
filter1len = 1; /* stage 1 filter length */
/* Make stage 1 filter */
{
double aa = AA; /* stop band attenuation(dB) */
double lpf,delta,d,df,alp,iza;
int ipsize,wsize;
frqgcd = gcd(sfrq,dfrq);
if (dfrq/frqgcd == 1) osf = 1;
else if (dfrq/frqgcd % 2 == 0) osf = 2;
else if (dfrq/frqgcd % 3 == 0) osf = 3;
else {
fprintf(stderr,"Resampling from %dHz to %dHz is not supported.\n",(int)sfrq,(int)dfrq);
fprintf(stderr,"%d/gcd(%d,%d)=%d must be divided by 2 or 3.\n",(int)dfrq,(int)sfrq,(int)dfrq,(int)(dfrq/frqgcd));
exit(-1);
}
fs1 = (int64_t)sfrq*osf;
delta = pow(10,-aa/20);
if (aa <= 21) d = 0.9222; else d = (aa-7.95)/14.36;
n1 = filter1len;
for(i=1;;i = i * 2)
{
n1 = filter1len * i;
if (n1 % 2 == 0) n1--;
df = (fs1*d)/(n1-1);
lpf = (dfrq-df)/2;
if (df < DF) break;
}
alp = alpha(aa);
iza = izero(alp);
for(n1b=1;n1b<n1;n1b*=2);
n1b *= 2;
stage1 = SleefDFT_malloc(n1b * sizeof(REAL));
for(i=0;i<n1b;i++) stage1[i] = 0;
for(i=-(n1/2);i<=n1/2;i++) {
stage1[i+n1/2] = win(i,n1,alp,iza)*hn_lpf(i,lpf,fs1)*fs1/sfrq/n1b*2;
}
dftf = SleefDFT_init(SLEEF_MODE_REAL | SLEEF_MODE_ALT | SLEEF_MODE_FORWARD , n1b);
dftb = SleefDFT_init(SLEEF_MODE_REAL | SLEEF_MODE_ALT | SLEEF_MODE_BACKWARD, n1b);
SleefDFT_execute(dftf, stage1, stage1);
}
/* Make stage 2 filter */
if (osf == 1) {
fs2 = (int64_t)sfrq/frqgcd*dfrq;
n2 = 1;
n2y = n2x = 1;
f2order = calloc(n2y,sizeof(int));
f2order[0] = 0;
f2inc = calloc(n2y,sizeof(int));
f2inc[0] = sfrq/dfrq;
stage2 = malloc(sizeof(REAL *)*n2y);
stage2[0] = calloc(n2x*n2y,sizeof(REAL));
stage2[0][0] = 1;
} else {
double aa = AA; /* stop band attenuation(dB) */
double lpf,delta,d,df,alp,iza;
double guard = 2;
fs2 = (int64_t)sfrq / frqgcd * dfrq;
df = (fs1/2 - sfrq/2) * 2 / guard;
lpf = sfrq/2 + (fs1/2 - sfrq/2)/guard;
delta = pow(10,-aa/20);
if (aa <= 21) d = 0.9222; else d = (aa-7.95)/14.36;
n2 = (int64_t)fs2/df*d+1;
if (n2 % 2 == 0) n2++;
alp = alpha(aa);
iza = izero(alp);
n2y = fs2/fs1; // non-zero samples are at intervals of n2y at fs2
n2x = n2/n2y+1;
f2order = calloc(n2y,sizeof(int));
for(i=0;i<n2y;i++) {
f2order[i] = fs2/fs1-(i*(fs2/dfrq))%(fs2/fs1);
if (f2order[i] == fs2/fs1) f2order[i] = 0;
}
f2inc = calloc(n2y,sizeof(int));
for(i=0;i<n2y;i++) {
f2inc[i] = (fs2/dfrq-f2order[i])/(fs2/fs1)+1;
if (f2order[i+1==n2y ? 0 : i+1] == 0) f2inc[i]--;
}
stage2 = malloc(sizeof(REAL *)*n2y);
stage2[0] = calloc(n2x*n2y,sizeof(REAL));
for(i=1;i<n2y;i++) {
stage2[i] = &(stage2[0][n2x*i]);
for(j=0;j<n2x;j++) stage2[i][j] = 0;
}
for(i=-(n2/2);i<=n2/2;i++)
{
stage2[(i+n2/2)%n2y][(i+n2/2)/n2y] = win(i,n2,alp,iza)*hn_lpf(i,lpf,fs2)*fs2/fs1;
}
}
/* Apply filters */
setstarttime();
{
int n1b2 = n1b/2;
int rp; // inbufのfs1での次に読むサンプルの場所を保持
int rps; // rpを(fs1/sfrq=osf)で割った余り
int rp2; // buf2のfs2での次に読むサンプルの場所を保持
int ds; // 次にdisposeするsfrqでのサンプル数
int nsmplwrt1 = 0; // 実際にファイルからinbufに読み込まれた値から計算した
// stage2 filterに渡されるサンプル数
int nsmplwrt2 = 0; // 実際にファイルからinbufに読み込まれた値から計算した
// stage2 filterに渡されるサンプル数
int s2p; // stage1 filterから出力されたサンプルの数をn1y*osfで割った余り
int init,ending;
int osc;
REAL *bp,*bp_backup; // rp2から計算される．buf2の次に読むサンプルの位置
int rps_backup,s2p_backup,osc_backup;
int k,ch,p;
int inbuflen=0;
int64_t sumread,sumwrite;
int delay = 0;
REAL *op;
// |....B....|....C....| buf1 n1b2+n1b2
//|.A.|....D....| buf2 n2x+n1b2
//
// まずinbufからBにosf倍サンプリングしながらコピー
// Cはクリア
// BCにstage 1 filterをかける
// DにBを足す
// ADにstage 2 filterをかける
// Dの後ろをAに移動
// CをDにコピー
buf1 = malloc(sizeof(REAL *)*nch);
for(i=0;i<nch;i++)
buf1[i] = SleefDFT_malloc(sizeof(REAL) * n1b);
buf2 = malloc(sizeof(REAL *)*nch);
for(i=0;i<nch;i++) {
buf2[i] = calloc(n2x+1+n1b2,sizeof(REAL));
for(j=0;j<n2x+1+n1b2;j++) buf2[i][j] = 0;
}
rawinbuf = calloc(nch*(n1b2/osf+osf+1),bps);
rawoutbuf = calloc(((double)n1b2*sfrq/dfrq+1),dbps*nch);
inbuf = calloc(nch*(n1b2/osf+osf+1),sizeof(REAL));
outbuf = calloc(nch*((double)n1b2*sfrq/dfrq+1),sizeof(REAL));
op = outbuf;
s2p = 0;
rp = 0;
rps = 0;
ds = 0;
osc = 0;
rp2 = 0;
init = 1;
ending = 0;
delay = (double)n1/2/((double)fs1/dfrq)+(double)n2/2/((double)fs2/dfrq);
sumread = sumwrite = 0;
for(;;)
{
int nsmplread;
int toberead;
toberead = (n1b2-rps-1)/osf+1;
if (toberead+sumread > chunklen) {
toberead = chunklen-sumread;
}
nsmplread = fread(rawinbuf,1,bps*nch*toberead,fpi);
nsmplread /= bps*nch;
switch(bps)
{
case 1:
for(i = 0; i < nsmplread * nch; i++)
inbuf[nch * inbuflen + i] =
(1 / (REAL)0x7f) * ((REAL)((uint8_t *)rawinbuf)[i]-128);
break;
case 2:
#ifndef BIGENDIAN
for(i=0;i<nsmplread*nch;i++)
inbuf[nch*inbuflen+i] = (1/(REAL)0x7fff)*(REAL)((int16_t *)rawinbuf)[i];
#else
for(i=0;i<nsmplread*nch;i++) {
inbuf[nch*inbuflen+i] = (1/(REAL)0x7fff)*
(((int)rawinbuf[i*2]) |
(((int)((int8_t *)rawinbuf)[i*2+1]) << 8));
}
#endif
break;
case 3:
for(i=0;i<nsmplread*nch;i++) {
inbuf[nch*inbuflen+i] = (1/(REAL)0x7fffff)*
((((int)rawinbuf[i*3 ]) << 0 ) |
(((int)rawinbuf[i*3+1]) << 8 ) |
(((int)((int8_t *)rawinbuf)[i*3+2]) << 16));
}
break;
case 4:
for(i=0;i<nsmplread*nch;i++) {
inbuf[nch*inbuflen+i] = (1/(REAL)0x7fffffff)*
((((int)rawinbuf[i*4 ]) << 0 ) |
(((int)rawinbuf[i*4+1]) << 8 ) |
(((int)rawinbuf[i*4+2]) << 16) |
(((int)((int8_t *)rawinbuf)[i*4+3]) << 24));
}
break;
}
assert(i <= nch*(n1b2/osf+osf+1));
for(;i<nch*toberead;i++) inbuf[i] = 0;
sumread += nsmplread;