X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Ffft-test.c;h=59a53ddeb6df0130a0ba7e87518c3cb549e4b470;hb=a72cad0a6c05aa74940101e937cb3dc602d7d67b;hp=87cb863a7a3546c63ad25b448bc98ef0dc7117d3;hpb=0979831511cf8cbc6675019c5932c18b8fec0d57;p=ffmpeg

diff --git a/libavcodec/fft-test.c b/libavcodec/fft-test.c
index 87cb863a7a3..59a53ddeb6d 100644
--- a/libavcodec/fft-test.c
+++ b/libavcodec/fft-test.c
@@ -1,14 +1,43 @@
+/*
+ * (c) 2002 Fabrice Bellard
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
 /**
- * @file fft-test.c
+ * @file
  * FFT and MDCT tests.
  */
 
-#include "dsputil.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/lfg.h"
+#include "libavutil/log.h"
+#include "fft.h"
+#if CONFIG_FFT_FLOAT
+#include "dct.h"
+#include "rdft.h"
+#endif
 #include <math.h>
 #include <unistd.h>
 #include <sys/time.h>
+#include <stdlib.h>
+#include <string.h>
 
-int mm_flags;
+#undef exit
 
 /* reference fft */
 
@@ -20,17 +49,29 @@ int mm_flags;
    pim += (MUL16(are, bim) + MUL16(bre, aim));\
 }
 
-FFTComplex *exptab;
-
-void fft_ref_init(int nbits, int inverse)
+#if CONFIG_FFT_FLOAT
+#   define RANGE 1.0
+#   define REF_SCALE(x, bits)  (x)
+#   define FMT "%10.6f"
+#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;
-    float c1, s1, alpha;
+    double c1, s1, alpha;
 
     n = 1 << nbits;
-    exptab = av_malloc((n / 2) * sizeof(FFTComplex));
+    exptab = av_malloc((n / 2) * sizeof(*exptab));
 
-    for(i=0;i<(n/2);i++) {
+    for (i = 0; i < (n/2); i++) {
         alpha = 2 * M_PI * (float)i / (float)n;
         c1 = cos(alpha);
         s1 = sin(alpha);
@@ -41,19 +82,19 @@ void fft_ref_init(int nbits, int inverse)
     }
 }
 
-void fft_ref(FFTComplex *tabr, FFTComplex *tab, int nbits)
+static void fft_ref(FFTComplex *tabr, FFTComplex *tab, int nbits)
 {
     int n, i, j, k, n2;
-    float tmp_re, tmp_im, s, c;
+    double tmp_re, tmp_im, s, c;
     FFTComplex *q;
 
     n = 1 << nbits;
     n2 = n >> 1;
-    for(i=0;i<n;i++) {
+    for (i = 0; i < n; i++) {
         tmp_re = 0;
         tmp_im = 0;
         q = tab;
-        for(j=0;j<n;j++) {
+        for (j = 0; j < n; j++) {
             k = (i * j) & (n - 1);
             if (k >= n2) {
                 c = -exptab[k - n2].re;
@@ -65,100 +106,162 @@ void fft_ref(FFTComplex *tabr, FFTComplex *tab, int nbits)
             CMAC(tmp_re, tmp_im, c, s, q->re, q->im);
             q++;
         }
-        tabr[i].re = tmp_re;
-        tabr[i].im = tmp_im;
+        tabr[i].re = REF_SCALE(tmp_re, nbits);
+        tabr[i].im = REF_SCALE(tmp_im, nbits);
     }
 }
 
-void imdct_ref(float *out, float *in, int n)
+static void imdct_ref(FFTSample *out, FFTSample *in, int nbits)
 {
+    int n = 1<<nbits;
     int k, i, a;
-    float sum, f;
+    double sum, f;
 
-    for(i=0;i<n;i++) {
+    for (i = 0; i < n; i++) {
         sum = 0;
-        for(k=0;k<n/2;k++) {
+        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] = -sum;
+        out[i] = REF_SCALE(-sum, nbits - 2);
     }
 }
 
 /* NOTE: no normalisation by 1 / N is done */
-void mdct_ref(float *output, float *input, int n)
+static void mdct_ref(FFTSample *output, FFTSample *input, int nbits)
 {
+    int n = 1<<nbits;
     int k, i;
-    float a, s;
+    double a, s;
 
     /* do it by hand */
-    for(k=0;k<n/2;k++) {
+    for (k = 0; k < n/2; k++) {
         s = 0;
-        for(i=0;i<n;i++) {
+        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(float *output, float *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(float *output, float *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
 
 
-float frandom(void)
+static FFTSample frandom(AVLFG *prng)
 {
-    return (float)((random() & 0xffff) - 32768) / 32768.0;
+    return (int16_t)av_lfg_get(prng) / 32768.0 * RANGE;
 }
 
-int64_t gettime(void)
+static int64_t gettime(void)
 {
     struct timeval tv;
     gettimeofday(&tv,NULL);
     return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
 }
 
-void check_diff(float *tab1, float *tab2, int n)
+static int check_diff(FFTSample *tab1, FFTSample *tab2, int n, double scale)
 {
     int i;
-
-    for(i=0;i<n;i++) {
-        if (fabsf(tab1[i] - tab2[i]) >= 1e-3) {
-            av_log(NULL, AV_LOG_ERROR, "ERROR %d: %f %f\n", 
+    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;
 }
 
 
-void help(void)
+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"
            );
     exit(1);
 }
 
-
+enum tf_transform {
+    TRANSFORM_FFT,
+    TRANSFORM_MDCT,
+    TRANSFORM_RDFT,
+    TRANSFORM_DCT,
+};
 
 int main(int argc, char **argv)
 {
     FFTComplex *tab, *tab1, *tab_ref;
-    FFTSample *tabtmp, *tab2;
+    FFTSample *tab2;
     int it, i, c;
     int do_speed = 0;
-    int do_mdct = 0;
+    int err = 1;
+    enum tf_transform transform = TRANSFORM_FFT;
     int do_inverse = 0;
     FFTContext s1, *s = &s1;
-    MDCTContext m1, *m = &m1;
+    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);
 
-    mm_flags = 0;
     fft_nbits = 9;
     for(;;) {
-        c = getopt(argc, argv, "hsimn:");
+        c = getopt(argc, argv, "hsimrdn:f:");
         if (c == -1)
             break;
         switch(c) {
@@ -172,11 +275,20 @@ int main(int argc, char **argv)
             do_inverse = 1;
             break;
         case 'm':
-            do_mdct = 1;
+            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;
         }
     }
 
@@ -184,54 +296,123 @@ int main(int argc, char **argv)
     tab = av_malloc(fft_size * sizeof(FFTComplex));
     tab1 = av_malloc(fft_size * sizeof(FFTComplex));
     tab_ref = av_malloc(fft_size * sizeof(FFTComplex));
-    tabtmp = av_malloc(fft_size / 2 * sizeof(FFTSample));
     tab2 = av_malloc(fft_size * sizeof(FFTSample));
 
-    if (do_mdct) {
+    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);
-    } else {
+        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;
+    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
+    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();
-        tab1[i].im = frandom();
+    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");
 
-    if (do_mdct) {
+    switch (transform) {
+    case TRANSFORM_MDCT:
         if (do_inverse) {
-            imdct_ref((float *)tab_ref, (float *)tab1, fft_size);
-            ff_imdct_calc(m, tab2, (float *)tab1, tabtmp);
-            check_diff((float *)tab_ref, tab2, fft_size);
+            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((float *)tab_ref, (float *)tab1, fft_size);
-            
-            ff_mdct_calc(m, tab2, (float *)tab1, tabtmp);
+            mdct_ref((FFTSample *)tab_ref, (FFTSample *)tab1, fft_nbits);
 
-            check_diff((float *)tab_ref, tab2, fft_size / 2);
+            m->mdct_calc(m, tab2, (FFTSample *)tab1);
+
+            err = check_diff((FFTSample *)tab_ref, tab2, fft_size / 2, scale);
         }
-    } else {
+        break;
+    case TRANSFORM_FFT:
         memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
-        ff_fft_permute(s, tab);
-        ff_fft_calc(s, tab);
-        
+        s->fft_permute(s, tab);
+        s->fft_calc(s, tab);
+
         fft_ref(tab_ref, tab1, fft_nbits);
-        check_diff((float *)tab_ref, (float *)tab, fft_size * 2);
+        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, tab);
+        if (do_inverse) {
+            idct_ref(tab_ref, tab1, fft_nbits);
+        } else {
+            dct_ref(tab_ref, tab1, fft_nbits);
+        }
+        err = check_diff((float *)tab_ref, (float *)tab, fft_size, 1.0);
+        break;
+#endif
     }
 
     /* do a speed test */
@@ -245,16 +426,29 @@ int main(int argc, char **argv)
         nb_its = 1;
         for(;;) {
             time_start = gettime();
-            for(it=0;it<nb_its;it++) {
-                if (do_mdct) {
+            for (it = 0; it < nb_its; it++) {
+                switch (transform) {
+                case TRANSFORM_MDCT:
                     if (do_inverse) {
-                        ff_imdct_calc(m, (float *)tab, (float *)tab1, tabtmp);
+                        m->imdct_calc(m, (FFTSample *)tab, (FFTSample *)tab1);
                     } else {
-                        ff_mdct_calc(m, (float *)tab, (float *)tab1, tabtmp);
+                        m->mdct_calc(m, (FFTSample *)tab, (FFTSample *)tab1);
                     }
-                } else {
+                    break;
+                case TRANSFORM_FFT:
                     memcpy(tab, tab1, fft_size * sizeof(FFTComplex));
-                    ff_fft_calc(s, tab);
+                    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 = gettime() - time_start;
@@ -262,16 +456,34 @@ int main(int argc, char **argv)
                 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, 
+        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);
     }
-    
-    if (do_mdct) {
+
+    switch (transform) {
+    case TRANSFORM_MDCT:
         ff_mdct_end(m);
-    } else {
+        break;
+    case TRANSFORM_FFT:
         ff_fft_end(s);
+        break;
+#if CONFIG_FFT_FLOAT
+    case TRANSFORM_RDFT:
+        ff_rdft_end(r);
+        break;
+    case TRANSFORM_DCT:
+        ff_dct_end(d);
+        break;
+#endif
     }
-    return 0;
+
+    av_free(tab);
+    av_free(tab1);
+    av_free(tab2);
+    av_free(tab_ref);
+    av_free(exptab);
+
+    return err;
 }