xenia-project/FFmpeg
1
0
Fork 0
mirror of https://github.com/xenia-project/FFmpeg.git synced 2024-11-24 20:19:55 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

fft-test: Add RDFT/IRDFT support.

Browse Source 
Originally committed as revision 21141 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse 2010-01-11 16:41:03 +00:00
parent 5b37ef8e43
commit c460833d76
1 changed files with 52 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
libavcodec/fft-test.c
View File

@ -176,6 +176,7 @@ static void help(void)
enum tf_transform {
TRANSFORM_FFT,
TRANSFORM_MDCT,
TRANSFORM_RDFT,
};
int main(int argc, char **argv)
@ -188,14 +189,15 @@ int main(int argc, char **argv)
int do_inverse = 0;
FFTContext s1, *s = &s1;
FFTContext m1, *m = &m1;
int fft_nbits, fft_size;
RDFTContext r1, *r = &r1;
int fft_nbits, fft_size, fft_size_2;
double scale = 1.0;
AVLFG prng;
av_lfg_init(&prng, 1);
fft_nbits = 9;
for(;;) {
c = getopt(argc, argv, "hsimn:f:");
c = getopt(argc, argv, "hsimrn:f:");
if (c == -1)
break;
switch(c) {
@ -211,6 +213,9 @@ int main(int argc, char **argv)
case 'm':
transform = TRANSFORM_MDCT;
break;
case 'r':
transform = TRANSFORM_RDFT;
break;
case 'n':
fft_nbits = atoi(optarg);
break;
@ -221,6 +226,7 @@ int main(int argc, char **argv)
}
fft_size = 1 << fft_nbits;
fft_size_2 = fft_size >> 1;
tab = av_malloc(fft_size * sizeof(FFTComplex));
tab1 = av_malloc(fft_size * sizeof(FFTComplex));
tab_ref = av_malloc(fft_size * sizeof(FFTComplex));
@ -243,6 +249,14 @@ int main(int argc, char **argv)
ff_fft_init(s, fft_nbits, do_inverse);
fft_ref_init(fft_nbits, do_inverse);
break;
case TRANSFORM_RDFT:
if (do_inverse)
av_log(NULL, AV_LOG_INFO,"IRDFT");
else
av_log(NULL, AV_LOG_INFO,"RDFT");
ff_rdft_init(r, fft_nbits, do_inverse ? IRDFT : RDFT);
fft_ref_init(fft_nbits, do_inverse);
break;
}
av_log(NULL, AV_LOG_INFO," %d test\n", fft_size);
@ -278,6 +292,35 @@ int main(int argc, char **argv)
fft_ref(tab_ref, tab1, fft_nbits);
check_diff((float *)tab_ref, (float *)tab, fft_size * 2, 1.0);
break;
case TRANSFORM_RDFT:
if (do_inverse) {
tab1[ 0].im = 0;
tab1[fft_size_2].im = 0;
for (i = 1; i < fft_size_2; i++) {
tab1[fft_size_2+i].re = tab1[fft_size_2-i].re;
tab1[fft_size_2+i].im = -tab1[fft_size_2-i].im;
}
memcpy(tab2, tab1, fft_size * sizeof(FFTSample));
tab2[1] = tab1[fft_size_2].re;
ff_rdft_calc(r, tab2);
fft_ref(tab_ref, tab1, fft_nbits);
for (i = 0; i < fft_size; i++) {
tab[i].re = tab2[i];
tab[i].im = 0;
}
check_diff((float *)tab_ref, (float *)tab, fft_size * 2, 0.5);
} else {
for (i = 0; i < fft_size; i++) {
tab2[i] = tab1[i].re;
tab1[i].im = 0;
}
ff_rdft_calc(r, tab2);
fft_ref(tab_ref, tab1, fft_nbits);
tab_ref[0].im = tab_ref[fft_size_2].re;
check_diff((float *)tab_ref, (float *)tab2, fft_size, 1.0);
}
}
/* do a speed test */
@ -304,6 +347,10 @@ int main(int argc, char **argv)
memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
ff_fft_calc(s, tab);
break;
case TRANSFORM_RDFT:
memcpy(tab2, tab1, fft_size * sizeof(FFTSample));
ff_rdft_calc(r, tab2);
break;
}
}
duration = gettime() - time_start;
@ -324,6 +371,9 @@ int main(int argc, char **argv)
case TRANSFORM_FFT:
ff_fft_end(s);
break;
case TRANSFORM_RDFT:
ff_rdft_end(r);
break;
}
return 0;
}