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wav_korr.c
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/*
* nasm -f elf wav_korr_asm.asm; gcc -O2 -s -DMPP_ENCODER -o wav_korr wav_korr.c wav_korr_asm.o -lm
* or:
* gcc -DNONASM -O2 -s -DMPP_ENCODER -o wav_korr wav_korr.c -lm
*/
#include "mppenc.h"
typedef signed short stereo [2];
typedef signed short mono;
typedef struct {
unsigned long long n;
long double x;
long double x2;
long double y;
long double y2;
long double xy;
} korr_t;
#if defined NONASM
void
analyze_stereo ( const stereo* p, size_t len, korr_t* k )
{
long double _x = 0, _x2 = 0, _y = 0, _y2 = 0, _xy = 0;
double t1;
double t2;
k -> n += len;
for ( ; len--; p++ ) {
_x += (t1 = (*p)[0]); _x2 += t1 * t1;
_y += (t2 = (*p)[1]); _y2 += t2 * t2;
_xy += t1 * t2;
}
k -> x += _x ;
k -> x2 += _x2;
k -> y += _y ;
k -> y2 += _y2;
k -> xy += _xy;
}
void
analyze_dstereo ( const stereo* p, size_t len, korr_t* k )
{
static double l0 = 0;
static double l1 = 0;
long double _x = 0, _x2 = 0, _y = 0, _y2 = 0, _xy = 0;
double t1;
double t2;
k -> n += len;
for ( ; len--; p++ ) {
_x += (t1 = (*p)[0] - l0); _x2 += t1 * t1;
_y += (t2 = (*p)[1] - l1); _y2 += t2 * t2;
_xy += t1 * t2;
l0 = (*p)[0];
l1 = (*p)[1];
}
k -> x += _x ;
k -> x2 += _x2;
k -> y += _y ;
k -> y2 += _y2;
k -> xy += _xy;
}
void
analyze_mono ( const mono* p, size_t len, korr_t* k )
{
long double _x = 0, _x2 = 0;
double t1;
k -> n += len;
for ( ; len--; p++ ) {
_x += (t1 = (*p)); _x2 += t1 * t1;
}
k -> x += _x ;
k -> x2 += _x2;
k -> y += _x ;
k -> y2 += _x2;
k -> xy += _x2;
}
void
analyze_dmono ( const mono* p, size_t len, korr_t* k )
{
static double l0 = 0;
long double _x = 0, _x2 = 0;
double t1;
k -> n += len;
for ( ; len--; p++ ) {
_x += (t1 = (*p) - l0); _x2 += t1 * t1;
l0 = *p;
}
k -> x += _x ;
k -> x2 += _x2;
k -> y += _x ;
k -> y2 += _x2;
k -> xy += _x2;
}
#else
extern void __analyze_stereo ( const stereo* p, size_t len, korr_t* dst );
extern void __analyze_mono ( const mono* p, size_t len, korr_t* dst );
# define analyze_stereo(ptr,len,k) __analyze_stereo ( ptr, len, k )
# define analyze_mono(ptr,len,k) __analyze_mono ( ptr, len, k )
#endif
static const char*
type ( double r, int channels )
{
if ( channels==1 ) return "1 channel";
if ( r > +0.98 ) return "Mono";
if ( r > +0.91 ) return "?";
if ( r > +0.3025 ) return "MS-Stereo";
if ( r > -0.3025 ) return "Stereo";
return "???";
}
static void
report_init ( void )
{
printf ( " x[AC] y[AC] r type x[DC] y[DC] sy/sx File\n");
}
static int
sgn ( long double x )
{
if ( x > 0 ) return +1;
if ( x < 0 ) return -1;
return 0;
}
static char
mono_or_stereo ( korr_t* k )
{
long double scale = sqrt ( 1.e5 / (1<<29) ); // Sine Full Scale is +10 dB, 7327 = 100%
long double r;
long double rd;
long double sx;
long double sy;
long double x;
long double y;
long double b;
static char last = 'm';
r = (k->x2*k->n - k->x*k->x) * (k->y2*k->n - k->y*k->y);
r = r > 0.l ? (k->xy*k->n - k->x*k->y) / sqrt (r) : 1.l;
sx = k->n > 1 ? sqrt ( (k->x2 - k->x*k->x/k->n) / (k->n - 1) ) : 0.l;
sy = k->n > 1 ? sqrt ( (k->y2 - k->y*k->y/k->n) / (k->n - 1) ) : 0.l;
x = k->n > 0 ? k->x/k->n : 0.l;
y = k->n > 0 ? k->y/k->n : 0.l;
b = atan2 ( sy, sx * sgn (r) ) * ( 8 / M_PI);
// 6 5 4 3 2
// _______________________________
// |\ | /|
// 7 | \ | / | 1
// | \ | / |
// | \ | / |
// | \ | / |
// 8 |--------------+--------------| 0
// | / | \ |
// | / | \ |
// -7 | / | \ | -1
// | / | \ |
// |/_____________|_____________\|
//
// -6 -5 -4 -3 -2
#define P1 0.500
#define P2 0.125
#define P3 1.000
rd = P2 + (P3-P2) * (1 - r*r);
switch (last) {
case 'm': if (r > 0.99 && fabs (b-2) < 0.02 ) return last = 'm';
if (r > 0.99 ) return last = 'i';
if ( fabs(b-2) < P1 || fabs(b-6) < P1 ) return last = 'j';
return 's';
case 'i': if (r > 0.999 && fabs (b-2) < 0.002 ) return last = 'm';
if (r > 0.99 ) return last = 'i';
if ( fabs(b-2) < P1 || fabs(b-6) < P1 ) return last = 'j';
return 's';
case 'j': if (r > 0.999 && fabs (b-2) < 0.002 ) return last = 'm';
if (r > 0.999 ) return last = 'i';
if ( fabs(b-2) < P1 || fabs(b-6) < P1 ) return last = 'j';
return 's';
case 's': if (r > 0.999 && fabs (b-2) < 0.002 ) return last = 'm';
if (r > 0.999 ) return last = 'i';
if ( fabs(b-2) < P1-rd || fabs(b-6) < P1-rd) return last = 'j';
return 's';
}
fprintf (stderr, "Internal error\n");
}
static void
report ( int channels, korr_t* k, int supress_DC_report )
{
long double scale = sqrt ( 1.e5 / (1<<29) ); // Sine Full Scale is +10 dB, 7327 = 100%
long double r;
long double sx;
long double sy;
long double x;
long double y;
long double b;
// printf ("n=%Lu (7036596)\nx=%Lf (-1136345)\ny=%Lf (-783749)\nxy=%Lf (103252784558988)\nx²=%Lf (182857029624921)\ny²=%Lf (201045032621475)\n\n",k.n,k.x,k.y,k.xy,k.x2,k.y2);
r = (k->x2*k->n - k->x*k->x) * (k->y2*k->n - k->y*k->y);
r = r > 0.l ? (k->xy*k->n - k->x*k->y) / sqrt (r) : 1.l;
sx = k->n > 1 ? sqrt ( (k->x2 - k->x*k->x/k->n) / (k->n - 1) ) : 0.l;
sy = k->n > 1 ? sqrt ( (k->y2 - k->y*k->y/k->n) / (k->n - 1) ) : 0.l;
x = k->n > 0 ? k->x/k->n : 0.l;
y = k->n > 0 ? k->y/k->n : 0.l;
b = sx != 0 ? sy/sx * sgn(r) : 0.l;
printf ( "%7.3Lf%%%9.3Lf%%%9.3Lf%% %-9s",
sx * scale, sy * scale, 100. * r, type (r, channels) );
if ( supress_DC_report )
printf ( " " );
else
printf ( "%7.3Lf%%%9.3Lf%%%", x * scale, y * scale );
printf ( " %6.3Lf\n", b );
fflush ( stdout );
}
static void
readfile ( const char* name, wave_t* t )
{
stereo s [1152];
mono m [1152];
size_t samples;
korr_t k0;
korr_t k1;
memset ( &k0, 0, sizeof(k0) );
memset ( &k1, 0, sizeof(k1) );
switch ( t->Channels ) {
case 1:
printf ("\n%s\n", name);
while ( ( samples = fread (m, 1, sizeof m, t->fp) ) > 0 ) {
analyze_mono ( m, samples / sizeof (*m), &k0 );
analyze_dmono ( m, samples / sizeof (*m), &k1 );
}
report ( t->Channels, &k0, 0 );
report ( t->Channels, &k1, 1 );
break;
case 2:
printf ("\n%s\n", name);
while ( ( samples = fread ( s, 1, sizeof s, t->fp) ) > 0 ) {
analyze_stereo ( s, samples / sizeof (*s), &k0 );
analyze_dstereo ( s, samples / sizeof (*s), &k1 );
}
report ( t->Channels, &k0, 0 );
report ( t->Channels, &k1, 1 );
break;
default:
fprintf ( stderr, "%u Channels not supported: %s\n", t->Channels, name );
break;
}
fflush ( stdout);
return;
}
int
main ( int argc, char** argv )
{
char* name;
FILE* fp;
wave_t t;
report_init ();
if ( argc < 2 ) {
name = "-";
if ( Open_WAV_Header ( &t, name ) >= 0 ) {
readfile ( name, &t );
fclose ( t.fp );
} else {
fprintf ( stderr, "Can't open: %s\n", name );
}
}
else {
while ( (name = *++argv) != NULL ) {
if ( Open_WAV_Header ( &t, name ) >= 0 ) {
readfile ( name, &t );
fclose ( t.fp );
} else {
fprintf ( stderr, "Can't open: %s\n", name );
}
}
}
return 0;
}
/* end of wav_korr.c */