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Support for testing (i)MDCT output scale factor in fft-test tool. 

Originally committed as revision 18877 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Siarhei Siamashka 2009-05-20 07:23:09 +00:00
parent 1754fe4d30
commit 34aecf1c87
1 changed files with 13 additions and 7 deletions
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20
libavcodec/fft-test.c
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@ -143,14 +143,14 @@ static int64_t gettime(void)
return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
}
static void check_diff(float *tab1, float *tab2, int n)
static void check_diff(float *tab1, float *tab2, int n, double scale)
{
int i;
double max= 0;
double error= 0;
for(i=0;i<n;i++) {
double e= fabsf(tab1[i] - tab2[i]);
double e= fabsf(tab1[i] - (tab2[i] / scale));
if (e >= 1e-3) {
av_log(NULL, AV_LOG_ERROR, "ERROR %d: %f %f\n",
i, tab1[i], tab2[i]);
@ -170,6 +170,7 @@ static void help(void)
"-m (I)MDCT test\n"
"-i inverse transform test\n"
"-n b set the transform size to 2^b\n"
"-f x set scale factor for output data of (I)MDCT to x\n"
);
exit(1);
}
@ -187,10 +188,11 @@ int main(int argc, char **argv)
FFTContext s1, *s = &s1;
MDCTContext m1, *m = &m1;
int fft_nbits, fft_size;
double scale = 1.0;
fft_nbits = 9;
for(;;) {
c = getopt(argc, argv, "hsimn:");
c = getopt(argc, argv, "hsimn:f:");
if (c == -1)
break;
switch(c) {
@ -209,6 +211,9 @@ int main(int argc, char **argv)
case 'n':
fft_nbits = atoi(optarg);
break;
case 'f':
scale = atof(optarg);
break;
}
}
@ -219,11 +224,12 @@ int main(int argc, char **argv)
tab2 = av_malloc(fft_size * sizeof(FFTSample));
if (do_mdct) {
av_log(NULL, AV_LOG_INFO,"Scale factor is set to %f\n", scale);
if (do_inverse)
av_log(NULL, AV_LOG_INFO,"IMDCT");
else
av_log(NULL, AV_LOG_INFO,"MDCT");
ff_mdct_init(m, fft_nbits, do_inverse, 1.0);
ff_mdct_init(m, fft_nbits, do_inverse, scale);
} else {
if (do_inverse)
av_log(NULL, AV_LOG_INFO,"IFFT");
@ -248,13 +254,13 @@ int main(int argc, char **argv)
if (do_inverse) {
imdct_ref((float *)tab_ref, (float *)tab1, fft_nbits);
ff_imdct_calc(m, tab2, (float *)tab1);
check_diff((float *)tab_ref, tab2, fft_size);
check_diff((float *)tab_ref, tab2, fft_size, scale);
} else {
mdct_ref((float *)tab_ref, (float *)tab1, fft_nbits);
ff_mdct_calc(m, tab2, (float *)tab1);
check_diff((float *)tab_ref, tab2, fft_size / 2);
check_diff((float *)tab_ref, tab2, fft_size / 2, scale);
}
} else {
memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
@ -262,7 +268,7 @@ int main(int argc, char **argv)
ff_fft_calc(s, tab);
fft_ref(tab_ref, tab1, fft_nbits);
check_diff((float *)tab_ref, (float *)tab, fft_size * 2);
check_diff((float *)tab_ref, (float *)tab, fft_size * 2, 1.0);
}
/* do a speed test */