115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
|
/*
|
||
|
|
* This file is part of FFmpeg.
|
||
|
|
*
|
||
|
|
* FFmpeg is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with FFmpeg; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <math.h>
|
||
|
|
#include <inttypes.h>
|
||
|
|
|
||
|
|
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
|
||
|
|
#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
|
||
|
|
|
||
|
|
static int64_t fsize(FILE *f) {
|
||
|
|
int64_t end, pos = ftell(f);
|
||
|
|
fseek(f, 0, SEEK_END);
|
||
|
|
end = ftell(f);
|
||
|
|
fseek(f, pos, SEEK_SET);
|
||
|
|
return end;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv) {
|
||
|
|
FILE *f[2];
|
||
|
|
int i, pos;
|
||
|
|
int siglen, datlen;
|
||
|
|
int bestpos = 0;
|
||
|
|
double bestc = 0;
|
||
|
|
double sigamp = 0;
|
||
|
|
int16_t *signal, *data;
|
||
|
|
int maxshift = 16384;
|
||
|
|
|
||
|
|
if (argc < 3) {
|
||
|
|
printf("audiomatch <testfile> <reffile>\n");
|
||
|
|
printf("WAV headers are skipped automatically.\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
f[0] = fopen(argv[1], "rb");
|
||
|
|
f[1] = fopen(argv[2], "rb");
|
||
|
|
if (!f[0] || !f[1]) {
|
||
|
|
fprintf(stderr, "Could not open input files.\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < 2; i++) {
|
||
|
|
uint8_t p[100];
|
||
|
|
if (fread(p, 1, 12, f[i]) != 12)
|
||
|
|
return 1;
|
||
|
|
if (!memcmp(p, "RIFF", 4) &&
|
||
|
|
!memcmp(p + 8, "WAVE", 4)) {
|
||
|
|
if (fread(p, 1, 8, f[i]) != 8)
|
||
|
|
return 1;
|
||
|
|
while (memcmp(p, "data", 4)) {
|
||
|
|
int s = p[4] | p[5] << 8 | p[6] << 16 | p[7] << 24;
|
||
|
|
fseek(f[i], s, SEEK_CUR);
|
||
|
|
if (fread(p, 1, 8, f[i]) != 8)
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
fseek(f[i], -12, SEEK_CUR);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
datlen = fsize(f[0]) - ftell(f[0]);
|
||
|
|
siglen = fsize(f[1]) - ftell(f[1]);
|
||
|
|
data = malloc(datlen * sizeof(*data));
|
||
|
|
signal = malloc(siglen * sizeof(*signal));
|
||
|
|
|
||
|
|
if (fread(data , 1, datlen, f[0]) != datlen)
|
||
|
|
return 1;
|
||
|
|
if (fread(signal, 1, siglen, f[1]) != siglen)
|
||
|
|
return 1;
|
||
|
|
datlen /= 2;
|
||
|
|
siglen /= 2;
|
||
|
|
|
||
|
|
for (i = 0; i < siglen; i++) {
|
||
|
|
signal[i] = ((uint8_t*)(signal + i))[0] + 256*((uint8_t*)(signal + i))[1];
|
||
|
|
sigamp += signal[i] * signal[i];
|
||
|
|
}
|
||
|
|
for (i = 0; i < datlen; i++)
|
||
|
|
data[i] = ((uint8_t*)(data + i))[0] + 256*((uint8_t*)(data + i))[1];
|
||
|
|
|
||
|
|
for (pos = 0; pos < maxshift; pos = pos < 0 ? -pos: -pos-1) {
|
||
|
|
int64_t c = 0;
|
||
|
|
int testlen = FFMIN(siglen, datlen-pos);
|
||
|
|
for (i = FFMAX(0, -pos); i < testlen; i++) {
|
||
|
|
int j = pos + i;
|
||
|
|
c += signal[i] * data[j];
|
||
|
|
}
|
||
|
|
if (fabs(c) > sigamp * 0.94)
|
||
|
|
maxshift = FFMIN(maxshift, fabs(pos)+32);
|
||
|
|
if (fabs(c) > fabs(bestc)) {
|
||
|
|
bestc = c;
|
||
|
|
bestpos = pos;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
printf("presig: %d postsig:%d c:%7.4f lenerr:%d\n", bestpos, datlen - siglen - bestpos, bestc / sigamp, datlen - siglen);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|