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Diffstat (limited to 'ffmpeg/libavcodec/fft-test.c')
| -rw-r--r-- | ffmpeg/libavcodec/fft-test.c | 507 |
1 files changed, 0 insertions, 507 deletions
diff --git a/ffmpeg/libavcodec/fft-test.c b/ffmpeg/libavcodec/fft-test.c deleted file mode 100644 index d650a10..0000000 --- a/ffmpeg/libavcodec/fft-test.c +++ /dev/null @@ -1,507 +0,0 @@ -/* - * (c) 2002 Fabrice Bellard - * - * 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 - */ - -/** - * @file - * FFT and MDCT tests. - */ - -#include "libavutil/cpu.h" -#include "libavutil/mathematics.h" -#include "libavutil/lfg.h" -#include "libavutil/log.h" -#include "libavutil/time.h" -#include "fft.h" -#if CONFIG_FFT_FLOAT -#include "dct.h" -#include "rdft.h" -#endif -#include <math.h> -#if HAVE_UNISTD_H -#include <unistd.h> -#endif -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -/* reference fft */ - -#define MUL16(a,b) ((a) * (b)) - -#define CMAC(pre, pim, are, aim, bre, bim) \ -{\ - pre += (MUL16(are, bre) - MUL16(aim, bim));\ - pim += (MUL16(are, bim) + MUL16(bre, aim));\ -} - -#if CONFIG_FFT_FLOAT -# define RANGE 1.0 -# define REF_SCALE(x, bits) (x) -# define FMT "%10.6f" -#elif CONFIG_FFT_FIXED_32 -# define RANGE 8388608 -# define REF_SCALE(x, bits) (x) -# define FMT "%6d" -#else -# define RANGE 16384 -# define REF_SCALE(x, bits) ((x) / (1<<(bits))) -# define FMT "%6d" -#endif - -struct { - float re, im; -} *exptab; - -static void fft_ref_init(int nbits, int inverse) -{ - int n, i; - double c1, s1, alpha; - - n = 1 << nbits; - exptab = av_malloc((n / 2) * sizeof(*exptab)); - - for (i = 0; i < (n/2); i++) { - alpha = 2 * M_PI * (float)i / (float)n; - c1 = cos(alpha); - s1 = sin(alpha); - if (!inverse) - s1 = -s1; - exptab[i].re = c1; - exptab[i].im = s1; - } -} - -static void fft_ref(FFTComplex *tabr, FFTComplex *tab, int nbits) -{ - int n, i, j, k, n2; - double tmp_re, tmp_im, s, c; - FFTComplex *q; - - n = 1 << nbits; - n2 = n >> 1; - for (i = 0; i < n; i++) { - tmp_re = 0; - tmp_im = 0; - q = tab; - for (j = 0; j < n; j++) { - k = (i * j) & (n - 1); - if (k >= n2) { - c = -exptab[k - n2].re; - s = -exptab[k - n2].im; - } else { - c = exptab[k].re; - s = exptab[k].im; - } - CMAC(tmp_re, tmp_im, c, s, q->re, q->im); - q++; - } - tabr[i].re = REF_SCALE(tmp_re, nbits); - tabr[i].im = REF_SCALE(tmp_im, nbits); - } -} - -static void imdct_ref(FFTSample *out, FFTSample *in, int nbits) -{ - int n = 1<<nbits; - int k, i, a; - double sum, f; - - for (i = 0; i < n; i++) { - sum = 0; - for (k = 0; k < n/2; k++) { - a = (2 * i + 1 + (n / 2)) * (2 * k + 1); - f = cos(M_PI * a / (double)(2 * n)); - sum += f * in[k]; - } - out[i] = REF_SCALE(-sum, nbits - 2); - } -} - -/* NOTE: no normalisation by 1 / N is done */ -static void mdct_ref(FFTSample *output, FFTSample *input, int nbits) -{ - int n = 1<<nbits; - int k, i; - double a, s; - - /* do it by hand */ - for (k = 0; k < n/2; k++) { - s = 0; - for (i = 0; i < n; i++) { - a = (2*M_PI*(2*i+1+n/2)*(2*k+1) / (4 * n)); - s += input[i] * cos(a); - } - output[k] = REF_SCALE(s, nbits - 1); - } -} - -#if CONFIG_FFT_FLOAT -static void idct_ref(FFTSample *output, FFTSample *input, int nbits) -{ - int n = 1<<nbits; - int k, i; - double a, s; - - /* do it by hand */ - for (i = 0; i < n; i++) { - s = 0.5 * input[0]; - for (k = 1; k < n; k++) { - a = M_PI*k*(i+0.5) / n; - s += input[k] * cos(a); - } - output[i] = 2 * s / n; - } -} -static void dct_ref(FFTSample *output, FFTSample *input, int nbits) -{ - int n = 1<<nbits; - int k, i; - double a, s; - - /* do it by hand */ - for (k = 0; k < n; k++) { - s = 0; - for (i = 0; i < n; i++) { - a = M_PI*k*(i+0.5) / n; - s += input[i] * cos(a); - } - output[k] = s; - } -} -#endif - - -static FFTSample frandom(AVLFG *prng) -{ - return (int16_t)av_lfg_get(prng) / 32768.0 * RANGE; -} - -static int check_diff(FFTSample *tab1, FFTSample *tab2, int n, double scale) -{ - int i; - double max= 0; - double error= 0; - int err = 0; - - for (i = 0; i < n; i++) { - double e = fabsf(tab1[i] - (tab2[i] / scale)) / RANGE; - if (e >= 1e-3) { - av_log(NULL, AV_LOG_ERROR, "ERROR %5d: "FMT" "FMT"\n", - i, tab1[i], tab2[i]); - err = 1; - } - error+= e*e; - if(e>max) max= e; - } - av_log(NULL, AV_LOG_INFO, "max:%f e:%g\n", max, sqrt(error/n)); - return err; -} - - -static void help(void) -{ - av_log(NULL, AV_LOG_INFO,"usage: fft-test [-h] [-s] [-i] [-n b]\n" - "-h print this help\n" - "-s speed test\n" - "-m (I)MDCT test\n" - "-d (I)DCT test\n" - "-r (I)RDFT 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" - ); -} - -enum tf_transform { - TRANSFORM_FFT, - TRANSFORM_MDCT, - TRANSFORM_RDFT, - TRANSFORM_DCT, -}; - -#if !HAVE_GETOPT -#include "compat/getopt.c" -#endif - -int main(int argc, char **argv) -{ - FFTComplex *tab, *tab1, *tab_ref; - FFTSample *tab2; - int it, i, c; - int cpuflags; - int do_speed = 0; - int err = 1; - enum tf_transform transform = TRANSFORM_FFT; - int do_inverse = 0; - FFTContext s1, *s = &s1; - FFTContext m1, *m = &m1; -#if CONFIG_FFT_FLOAT - RDFTContext r1, *r = &r1; - DCTContext d1, *d = &d1; - int fft_size_2; -#endif - int fft_nbits, fft_size; - double scale = 1.0; - AVLFG prng; - av_lfg_init(&prng, 1); - - fft_nbits = 9; - for(;;) { - c = getopt(argc, argv, "hsimrdn:f:c:"); - if (c == -1) - break; - switch(c) { - case 'h': - help(); - return 1; - case 's': - do_speed = 1; - break; - case 'i': - do_inverse = 1; - break; - case 'm': - transform = TRANSFORM_MDCT; - break; - case 'r': - transform = TRANSFORM_RDFT; - break; - case 'd': - transform = TRANSFORM_DCT; - break; - case 'n': - fft_nbits = atoi(optarg); - break; - case 'f': - scale = atof(optarg); - break; - case 'c': - cpuflags = av_get_cpu_flags(); - - if (av_parse_cpu_caps(&cpuflags, optarg) < 0) - return 1; - - av_force_cpu_flags(cpuflags); - break; - } - } - - fft_size = 1 << fft_nbits; - tab = av_malloc(fft_size * sizeof(FFTComplex)); - tab1 = av_malloc(fft_size * sizeof(FFTComplex)); - tab_ref = av_malloc(fft_size * sizeof(FFTComplex)); - tab2 = av_malloc(fft_size * sizeof(FFTSample)); - - switch (transform) { - case TRANSFORM_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, scale); - break; - case TRANSFORM_FFT: - if (do_inverse) - av_log(NULL, AV_LOG_INFO,"IFFT"); - else - av_log(NULL, AV_LOG_INFO,"FFT"); - ff_fft_init(s, fft_nbits, do_inverse); - fft_ref_init(fft_nbits, do_inverse); - break; -#if CONFIG_FFT_FLOAT - case TRANSFORM_RDFT: - if (do_inverse) - av_log(NULL, AV_LOG_INFO,"IDFT_C2R"); - else - av_log(NULL, AV_LOG_INFO,"DFT_R2C"); - ff_rdft_init(r, fft_nbits, do_inverse ? IDFT_C2R : DFT_R2C); - fft_ref_init(fft_nbits, do_inverse); - break; -# if CONFIG_DCT - case TRANSFORM_DCT: - if (do_inverse) - av_log(NULL, AV_LOG_INFO,"DCT_III"); - else - av_log(NULL, AV_LOG_INFO,"DCT_II"); - ff_dct_init(d, fft_nbits, do_inverse ? DCT_III : DCT_II); - break; -# endif -#endif - default: - av_log(NULL, AV_LOG_ERROR, "Requested transform not supported\n"); - return 1; - } - av_log(NULL, AV_LOG_INFO," %d test\n", fft_size); - - /* generate random data */ - - for (i = 0; i < fft_size; i++) { - tab1[i].re = frandom(&prng); - tab1[i].im = frandom(&prng); - } - - /* checking result */ - av_log(NULL, AV_LOG_INFO,"Checking...\n"); - - switch (transform) { - case TRANSFORM_MDCT: - if (do_inverse) { - imdct_ref((FFTSample *)tab_ref, (FFTSample *)tab1, fft_nbits); - m->imdct_calc(m, tab2, (FFTSample *)tab1); - err = check_diff((FFTSample *)tab_ref, tab2, fft_size, scale); - } else { - mdct_ref((FFTSample *)tab_ref, (FFTSample *)tab1, fft_nbits); - - m->mdct_calc(m, tab2, (FFTSample *)tab1); - - err = check_diff((FFTSample *)tab_ref, tab2, fft_size / 2, scale); - } - break; - case TRANSFORM_FFT: - memcpy(tab, tab1, fft_size * sizeof(FFTComplex)); - s->fft_permute(s, tab); - s->fft_calc(s, tab); - - fft_ref(tab_ref, tab1, fft_nbits); - err = check_diff((FFTSample *)tab_ref, (FFTSample *)tab, fft_size * 2, 1.0); - break; -#if CONFIG_FFT_FLOAT - case TRANSFORM_RDFT: - fft_size_2 = fft_size >> 1; - 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; - - r->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; - } - err = 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; - } - r->rdft_calc(r, tab2); - fft_ref(tab_ref, tab1, fft_nbits); - tab_ref[0].im = tab_ref[fft_size_2].re; - err = check_diff((float *)tab_ref, (float *)tab2, fft_size, 1.0); - } - break; - case TRANSFORM_DCT: - memcpy(tab, tab1, fft_size * sizeof(FFTComplex)); - d->dct_calc(d, (FFTSample *)tab); - if (do_inverse) { - idct_ref((FFTSample*)tab_ref, (FFTSample *)tab1, fft_nbits); - } else { - dct_ref((FFTSample*)tab_ref, (FFTSample *)tab1, fft_nbits); - } - err = check_diff((float *)tab_ref, (float *)tab, fft_size, 1.0); - break; -#endif - } - - /* do a speed test */ - - if (do_speed) { - int64_t time_start, duration; - int nb_its; - - av_log(NULL, AV_LOG_INFO,"Speed test...\n"); - /* we measure during about 1 seconds */ - nb_its = 1; - for(;;) { - time_start = av_gettime(); - for (it = 0; it < nb_its; it++) { - switch (transform) { - case TRANSFORM_MDCT: - if (do_inverse) { - m->imdct_calc(m, (FFTSample *)tab, (FFTSample *)tab1); - } else { - m->mdct_calc(m, (FFTSample *)tab, (FFTSample *)tab1); - } - break; - case TRANSFORM_FFT: - memcpy(tab, tab1, fft_size * sizeof(FFTComplex)); - s->fft_calc(s, tab); - break; -#if CONFIG_FFT_FLOAT - case TRANSFORM_RDFT: - memcpy(tab2, tab1, fft_size * sizeof(FFTSample)); - r->rdft_calc(r, tab2); - break; - case TRANSFORM_DCT: - memcpy(tab2, tab1, fft_size * sizeof(FFTSample)); - d->dct_calc(d, tab2); - break; -#endif - } - } - duration = av_gettime() - time_start; - if (duration >= 1000000) - break; - nb_its *= 2; - } - av_log(NULL, AV_LOG_INFO,"time: %0.1f us/transform [total time=%0.2f s its=%d]\n", - (double)duration / nb_its, - (double)duration / 1000000.0, - nb_its); - } - - switch (transform) { - case TRANSFORM_MDCT: - ff_mdct_end(m); - break; - case TRANSFORM_FFT: - ff_fft_end(s); - break; -#if CONFIG_FFT_FLOAT - case TRANSFORM_RDFT: - ff_rdft_end(r); - break; -# if CONFIG_DCT - case TRANSFORM_DCT: - ff_dct_end(d); - break; -# endif -#endif - } - - av_free(tab); - av_free(tab1); - av_free(tab2); - av_free(tab_ref); - av_free(exptab); - - if (err) - printf("Error: %d.\n", err); - - return !!err; -} |