libavcodec/fft-test.c - nest-android-app/ffmpeg - Git at Google

 /*
  * (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 "config.h"

 #include <math.h>
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

 #include "libavutil/cpu.h"
 #include "libavutil/lfg.h"
 #include "libavutil/log.h"
 #include "libavutil/mathematics.h"
 #include "libavutil/time.h"

 #include "fft.h"
 #if FFT_FLOAT
 #include "dct.h"
 #include "rdft.h"
 #endif

 /* 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 FFT_FLOAT
 #define RANGE 1.0
 #define REF_SCALE(x, bits)  (x)
 #define FMT "%10.6f"
 #elif 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

 static struct {
     float re, im;
 } *exptab;

 static int fft_ref_init(int nbits, int inverse)
 {
     int i, n = 1 << nbits;

     exptab = av_malloc_array((n / 2), sizeof(*exptab));
     if (!exptab)
         return AVERROR(ENOMEM);

     for (i = 0; i < (n / 2); i++) {
         double alpha = 2 * M_PI * (float) i / (float) n;
         double c1 = cos(alpha), s1 = sin(alpha);
         if (!inverse)
             s1 = -s1;
         exptab[i].re = c1;
         exptab[i].im = s1;
     }
     return 0;
 }

 static void fft_ref(FFTComplex *tabr, FFTComplex *tab, int nbits)
 {
     int i, j;
     int n  = 1 << nbits;
     int n2 = n >> 1;

     for (i = 0; i < n; i++) {
         double tmp_re = 0, tmp_im = 0;
         FFTComplex *q = tab;
         for (j = 0; j < n; j++) {
             double s, c;
             int 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);
     }
 }

 #if CONFIG_MDCT
 static void imdct_ref(FFTSample *out, FFTSample *in, int nbits)
 {
     int i, k, n = 1 << nbits;

     for (i = 0; i < n; i++) {
         double sum = 0;
         for (k = 0; k < n / 2; k++) {
             int a = (2 * i + 1 + (n / 2)) * (2 * k + 1);
             double 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 i, k, n = 1 << nbits;

     /* do it by hand */
     for (k = 0; k < n / 2; k++) {
         double s = 0;
         for (i = 0; i < n; i++) {
             double 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);
     }
 }
 #endif /* CONFIG_MDCT */

 #if FFT_FLOAT
 #if CONFIG_DCT
 static void idct_ref(FFTSample *output, FFTSample *input, int nbits)
 {
     int i, k, n = 1 << nbits;

     /* do it by hand */
     for (i = 0; i < n; i++) {
         double s = 0.5 * input[0];
         for (k = 1; k < n; k++) {
             double 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 i, k, n = 1 << nbits;

     /* do it by hand */
     for (k = 0; k < n; k++) {
         double s = 0;
         for (i = 0; i < n; i++) {
             double a = M_PI * k * (i + 0.5) / n;
             s += input[i] * cos(a);
         }
         output[k] = s;
     }
 }
 #endif /* CONFIG_DCT */
 #endif /* FFT_FLOAT */

 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, err = 0;
     double error = 0, max = 0;

     for (i = 0; i < n; i++) {
         double e = fabs(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;
     enum tf_transform transform = TRANSFORM_FFT;
     FFTContext m, s;
 #if FFT_FLOAT
     RDFTContext r;
     DCTContext d;
 #endif /* FFT_FLOAT */
     int it, i, err = 1;
     int do_speed = 0, do_inverse = 0;
     int fft_nbits = 9, fft_size;
     double scale = 1.0;
     AVLFG prng;

     av_lfg_init(&prng, 1);

     for (;;) {
         int 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':
         {
             unsigned 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_array(fft_size, sizeof(FFTComplex));
     tab1     = av_malloc_array(fft_size, sizeof(FFTComplex));
     tab_ref  = av_malloc_array(fft_size, sizeof(FFTComplex));
     tab2     = av_malloc_array(fft_size, sizeof(FFTSample));

     if (!(tab && tab1 && tab_ref && tab2))
         goto cleanup;

     switch (transform) {
 #if CONFIG_MDCT
     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;
 #endif /* CONFIG_MDCT */
     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);
         if ((err = fft_ref_init(fft_nbits, do_inverse)) < 0)
             goto cleanup;
         break;
 #if FFT_FLOAT
 #    if CONFIG_RDFT
     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);
         if ((err = fft_ref_init(fft_nbits, do_inverse)) < 0)
             goto cleanup;
         break;
 #    endif /* CONFIG_RDFT */
 #    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 /* CONFIG_DCT */
 #endif /* FFT_FLOAT */
     default:
         av_log(NULL, AV_LOG_ERROR, "Requested transform not supported\n");
         goto cleanup;
     }
     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) {
 #if CONFIG_MDCT
     case TRANSFORM_MDCT:
         if (do_inverse) {
             imdct_ref(&tab_ref->re, &tab1->re, fft_nbits);
             m.imdct_calc(&m, tab2, &tab1->re);
             err = check_diff(&tab_ref->re, tab2, fft_size, scale);
         } else {
             mdct_ref(&tab_ref->re, &tab1->re, fft_nbits);
             m.mdct_calc(&m, tab2, &tab1->re);
             err = check_diff(&tab_ref->re, tab2, fft_size / 2, scale);
         }
         break;
 #endif /* CONFIG_MDCT */
     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(&tab_ref->re, &tab->re, fft_size * 2, 1.0);
         break;
 #if FFT_FLOAT
 #if CONFIG_RDFT
     case TRANSFORM_RDFT:
     {
         int 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(&tab_ref->re, &tab->re, 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(&tab_ref->re, tab2, fft_size, 1.0);
         }
         break;
     }
 #endif /* CONFIG_RDFT */
 #if CONFIG_DCT
     case TRANSFORM_DCT:
         memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
         d.dct_calc(&d, &tab->re);
         if (do_inverse)
             idct_ref(&tab_ref->re, &tab1->re, fft_nbits);
         else
             dct_ref(&tab_ref->re, &tab1->re, fft_nbits);
         err = check_diff(&tab_ref->re, &tab->re, fft_size, 1.0);
         break;
 #endif /* CONFIG_DCT */
 #endif /* FFT_FLOAT */
     }

     /* 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_relative();
             for (it = 0; it < nb_its; it++) {
                 switch (transform) {
                 case TRANSFORM_MDCT:
                     if (do_inverse)
                         m.imdct_calc(&m, &tab->re, &tab1->re);
                     else
                         m.mdct_calc(&m, &tab->re, &tab1->re);
                     break;
                 case TRANSFORM_FFT:
                     memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
                     s.fft_calc(&s, tab);
                     break;
 #if 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 /* FFT_FLOAT */
                 }
             }
             duration = av_gettime_relative() - 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) {
 #if CONFIG_MDCT
     case TRANSFORM_MDCT:
         ff_mdct_end(&m);
         break;
 #endif /* CONFIG_MDCT */
     case TRANSFORM_FFT:
         ff_fft_end(&s);
         break;
 #if FFT_FLOAT
 #    if CONFIG_RDFT
     case TRANSFORM_RDFT:
         ff_rdft_end(&r);
         break;
 #    endif /* CONFIG_RDFT */
 #    if CONFIG_DCT
     case TRANSFORM_DCT:
         ff_dct_end(&d);
         break;
 #    endif /* CONFIG_DCT */
 #endif /* FFT_FLOAT */
     }

 cleanup:
     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;
 }
	/*
	* (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 "config.h"

	#include <math.h>
	#if HAVE_UNISTD_H
	#include <unistd.h>
	#endif
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>

	#include "libavutil/cpu.h"
	#include "libavutil/lfg.h"
	#include "libavutil/log.h"
	#include "libavutil/mathematics.h"
	#include "libavutil/time.h"

	#include "fft.h"
	#if FFT_FLOAT
	#include "dct.h"
	#include "rdft.h"
	#endif

	/* 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 FFT_FLOAT
	#define RANGE 1.0
	#define REF_SCALE(x, bits) (x)
	#define FMT "%10.6f"
	#elif 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

	static struct {
	float re, im;
	} *exptab;

	static int fft_ref_init(int nbits, int inverse)
	{
	int i, n = 1 << nbits;

	exptab = av_malloc_array((n / 2), sizeof(*exptab));
	if (!exptab)
	return AVERROR(ENOMEM);

	for (i = 0; i < (n / 2); i++) {
	double alpha = 2 * M_PI * (float) i / (float) n;
	double c1 = cos(alpha), s1 = sin(alpha);
	if (!inverse)
	s1 = -s1;
	exptab[i].re = c1;
	exptab[i].im = s1;
	}
	return 0;
	}

	static void fft_ref(FFTComplex tabr, FFTComplex tab, int nbits)
	{
	int i, j;
	int n = 1 << nbits;
	int n2 = n >> 1;

	for (i = 0; i < n; i++) {
	double tmp_re = 0, tmp_im = 0;
	FFTComplex *q = tab;
	for (j = 0; j < n; j++) {
	double s, c;
	int 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);
	}
	}

	#if CONFIG_MDCT
	static void imdct_ref(FFTSample out, FFTSample in, int nbits)
	{
	int i, k, n = 1 << nbits;

	for (i = 0; i < n; i++) {
	double sum = 0;
	for (k = 0; k < n / 2; k++) {
	int a = (2 * i + 1 + (n / 2)) * (2 * k + 1);
	double 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 i, k, n = 1 << nbits;

	/* do it by hand */
	for (k = 0; k < n / 2; k++) {
	double s = 0;
	for (i = 0; i < n; i++) {
	double 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);
	}
	}
	#endif /* CONFIG_MDCT */

	#if FFT_FLOAT
	#if CONFIG_DCT
	static void idct_ref(FFTSample output, FFTSample input, int nbits)
	{
	int i, k, n = 1 << nbits;

	/* do it by hand */
	for (i = 0; i < n; i++) {
	double s = 0.5 * input[0];
	for (k = 1; k < n; k++) {
	double 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 i, k, n = 1 << nbits;

	/* do it by hand */
	for (k = 0; k < n; k++) {
	double s = 0;
	for (i = 0; i < n; i++) {
	double a = M_PI * k * (i + 0.5) / n;
	s += input[i] * cos(a);
	}
	output[k] = s;
	}
	}
	#endif /* CONFIG_DCT */
	#endif /* FFT_FLOAT */

	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, err = 0;
	double error = 0, max = 0;

	for (i = 0; i < n; i++) {
	double e = fabs(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;
	enum tf_transform transform = TRANSFORM_FFT;
	FFTContext m, s;
	#if FFT_FLOAT
	RDFTContext r;
	DCTContext d;
	#endif /* FFT_FLOAT */
	int it, i, err = 1;
	int do_speed = 0, do_inverse = 0;
	int fft_nbits = 9, fft_size;
	double scale = 1.0;
	AVLFG prng;

	av_lfg_init(&prng, 1);

	for (;;) {
	int 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':
	{
	unsigned 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_array(fft_size, sizeof(FFTComplex));
	tab1 = av_malloc_array(fft_size, sizeof(FFTComplex));
	tab_ref = av_malloc_array(fft_size, sizeof(FFTComplex));
	tab2 = av_malloc_array(fft_size, sizeof(FFTSample));

	if (!(tab && tab1 && tab_ref && tab2))
	goto cleanup;

	switch (transform) {
	#if CONFIG_MDCT
	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;
	#endif /* CONFIG_MDCT */
	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);
	if ((err = fft_ref_init(fft_nbits, do_inverse)) < 0)
	goto cleanup;
	break;
	#if FFT_FLOAT
	# if CONFIG_RDFT
	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);
	if ((err = fft_ref_init(fft_nbits, do_inverse)) < 0)
	goto cleanup;
	break;
	# endif /* CONFIG_RDFT */
	# 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 /* CONFIG_DCT */
	#endif /* FFT_FLOAT */
	default:
	av_log(NULL, AV_LOG_ERROR, "Requested transform not supported\n");
	goto cleanup;
	}
	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) {
	#if CONFIG_MDCT
	case TRANSFORM_MDCT:
	if (do_inverse) {
	imdct_ref(&tab_ref->re, &tab1->re, fft_nbits);
	m.imdct_calc(&m, tab2, &tab1->re);
	err = check_diff(&tab_ref->re, tab2, fft_size, scale);
	} else {
	mdct_ref(&tab_ref->re, &tab1->re, fft_nbits);
	m.mdct_calc(&m, tab2, &tab1->re);
	err = check_diff(&tab_ref->re, tab2, fft_size / 2, scale);
	}
	break;
	#endif /* CONFIG_MDCT */
	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(&tab_ref->re, &tab->re, fft_size * 2, 1.0);
	break;
	#if FFT_FLOAT
	#if CONFIG_RDFT
	case TRANSFORM_RDFT:
	{
	int 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(&tab_ref->re, &tab->re, 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(&tab_ref->re, tab2, fft_size, 1.0);
	}
	break;
	}
	#endif /* CONFIG_RDFT */
	#if CONFIG_DCT
	case TRANSFORM_DCT:
	memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
	d.dct_calc(&d, &tab->re);
	if (do_inverse)
	idct_ref(&tab_ref->re, &tab1->re, fft_nbits);
	else
	dct_ref(&tab_ref->re, &tab1->re, fft_nbits);
	err = check_diff(&tab_ref->re, &tab->re, fft_size, 1.0);
	break;
	#endif /* CONFIG_DCT */
	#endif /* FFT_FLOAT */
	}

	/* 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_relative();
	for (it = 0; it < nb_its; it++) {
	switch (transform) {
	case TRANSFORM_MDCT:
	if (do_inverse)
	m.imdct_calc(&m, &tab->re, &tab1->re);
	else
	m.mdct_calc(&m, &tab->re, &tab1->re);
	break;
	case TRANSFORM_FFT:
	memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
	s.fft_calc(&s, tab);
	break;
	#if 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 /* FFT_FLOAT */
	}
	}
	duration = av_gettime_relative() - 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) {
	#if CONFIG_MDCT
	case TRANSFORM_MDCT:
	ff_mdct_end(&m);
	break;
	#endif /* CONFIG_MDCT */
	case TRANSFORM_FFT:
	ff_fft_end(&s);
	break;
	#if FFT_FLOAT
	# if CONFIG_RDFT
	case TRANSFORM_RDFT:
	ff_rdft_end(&r);
	break;
	# endif /* CONFIG_RDFT */
	# if CONFIG_DCT
	case TRANSFORM_DCT:
	ff_dct_end(&d);
	break;
	# endif /* CONFIG_DCT */
	#endif /* FFT_FLOAT */
	}

	cleanup:
	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;
	}