/* * 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 "config.h" #include "libavutil/mem.h" #include "avfft.h" int main(int argc, char **argv) { int i; #define LEN 1024 FFTSample *ref = av_malloc_array(LEN, sizeof(*ref)); FFTSample *data = av_malloc_array(LEN, sizeof(*data)); RDFTContext *rdft_context = av_rdft_init(10, DFT_R2C); RDFTContext *irdft_context = av_rdft_init(10, IDFT_C2R); if (!ref || !data || !rdft_context || !irdft_context) return 2; for (i=0; i<LEN; i++) { ref[i] = data[i] = i*456 + 123 + i*i; } av_rdft_calc(rdft_context, data); av_rdft_calc(irdft_context, data); for (i=0; i<LEN; i++) { if (fabs(ref[i] - data[i]/LEN*2) > 1) { fprintf(stderr, "Failed at %d (%f %f)\n", i, ref[i], data[i]/LEN*2); return 1; } } av_rdft_end(rdft_context); av_rdft_end(irdft_context); av_free(data); av_free(ref); return 0; }