2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "libavutil/mem.h"
23 int main(int argc, char **argv)
27 FFTSample *ref = av_malloc_array(LEN, sizeof(*ref));
28 FFTSample *data = av_malloc_array(LEN, sizeof(*data));
29 RDFTContext *rdft_context = av_rdft_init(10, DFT_R2C);
30 RDFTContext *irdft_context = av_rdft_init(10, IDFT_C2R);
32 if (!ref || !data || !rdft_context || !irdft_context)
34 for (i=0; i<LEN; i++) {
35 ref[i] = data[i] = i*456 + 123 + i*i;
37 av_rdft_calc(rdft_context, data);
38 av_rdft_calc(irdft_context, data);
40 for (i=0; i<LEN; i++) {
41 if (fabs(ref[i] - data[i]/LEN*2) > 1) {
42 fprintf(stderr, "Failed at %d (%f %f)\n", i, ref[i], data[i]/LEN*2);
47 av_rdft_end(rdft_context);
48 av_rdft_end(irdft_context);