[FFmpeg-cvslog] Fixed-point support in fft-test
Mans Rullgard
git at videolan.org
Sat Apr 2 02:02:21 CEST 2011
ffmpeg | branch: master | Mans Rullgard <mans at mansr.com> | Wed Mar 30 21:13:21 2011 +0100| [6efe6028ed182d82d4ac8b9801fbcee91a88c053] | committer: Mans Rullgard
Fixed-point support in fft-test
Signed-off-by: Mans Rullgard <mans at mansr.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6efe6028ed182d82d4ac8b9801fbcee91a88c053
---
libavcodec/Makefile | 2 +-
libavcodec/fft-fixed-test.c | 20 ++++++++++++
libavcodec/fft-test.c | 73 ++++++++++++++++++++++++++++++-------------
3 files changed, 72 insertions(+), 23 deletions(-)
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 4f3392f..837f7e2 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -656,7 +656,7 @@ SKIPHEADERS += mpegaudio3.h
EXAMPLES = api
-TESTPROGS = cabac dct eval fft h264 iirfilter rangecoder snow
+TESTPROGS = cabac dct eval fft fft-fixed h264 iirfilter rangecoder snow
TESTPROGS-$(HAVE_MMX) += motion
TESTOBJS = dctref.o
diff --git a/libavcodec/fft-fixed-test.c b/libavcodec/fft-fixed-test.c
new file mode 100644
index 0000000..63cd194
--- /dev/null
+++ b/libavcodec/fft-fixed-test.c
@@ -0,0 +1,20 @@
+/*
+ * 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
+ */
+
+#define CONFIG_FFT_FLOAT 0
+#include "fft-test.c"
diff --git a/libavcodec/fft-test.c b/libavcodec/fft-test.c
index acfc563..0112c6f 100644
--- a/libavcodec/fft-test.c
+++ b/libavcodec/fft-test.c
@@ -27,8 +27,10 @@
#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>
@@ -47,7 +49,19 @@
pim += (MUL16(are, bim) + MUL16(bre, aim));\
}
-FFTComplex *exptab;
+#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)
{
@@ -55,7 +69,7 @@ static void fft_ref_init(int nbits, int inverse)
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++) {
alpha = 2 * M_PI * (float)i / (float)n;
@@ -92,12 +106,12 @@ static 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);
}
}
-static void imdct_ref(float *out, float *in, int nbits)
+static void imdct_ref(FFTSample *out, FFTSample *in, int nbits)
{
int n = 1<<nbits;
int k, i, a;
@@ -110,12 +124,12 @@ static void imdct_ref(float *out, float *in, int nbits)
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 */
-static void mdct_ref(float *output, float *input, int nbits)
+static void mdct_ref(FFTSample *output, FFTSample *input, int nbits)
{
int n = 1<<nbits;
int k, i;
@@ -128,10 +142,11 @@ static void mdct_ref(float *output, float *input, int nbits)
a = (2*M_PI*(2*i+1+n/2)*(2*k+1) / (4 * n));
s += input[i] * cos(a);
}
- output[k] = s;
+ 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;
@@ -164,11 +179,12 @@ static void dct_ref(float *output, float *input, int nbits)
output[k] = s;
}
}
+#endif
-static float frandom(AVLFG *prng)
+static FFTSample frandom(AVLFG *prng)
{
- return (int16_t)av_lfg_get(prng) / 32768.0;
+ return (int16_t)av_lfg_get(prng) / 32768.0 * RANGE;
}
static int64_t gettime(void)
@@ -178,7 +194,7 @@ static int64_t gettime(void)
return (int64_t)tv.tv_sec * 1000000 + tv.tv_usec;
}
-static int check_diff(float *tab1, float *tab2, int n, double scale)
+static int check_diff(FFTSample *tab1, FFTSample *tab2, int n, double scale)
{
int i;
double max= 0;
@@ -186,9 +202,9 @@ static int check_diff(float *tab1, float *tab2, int n, double scale)
int err = 0;
for (i = 0; i < n; i++) {
- double e= fabsf(tab1[i] - (tab2[i] / scale));
+ double e = fabsf(tab1[i] - (tab2[i] / scale)) / RANGE;
if (e >= 1e-3) {
- av_log(NULL, AV_LOG_ERROR, "ERROR %5d: %10.6f %10.6f\n",
+ av_log(NULL, AV_LOG_ERROR, "ERROR %5d: "FMT" "FMT"\n",
i, tab1[i], tab2[i]);
err = 1;
}
@@ -233,8 +249,10 @@ int main(int argc, char **argv)
int do_inverse = 0;
FFTContext s1, *s = &s1;
FFTContext m1, *m = &m1;
+#if CONFIG_FFT_FLOAT
RDFTContext r1, *r = &r1;
DCTContext d1, *d = &d1;
+#endif
int fft_nbits, fft_size, fft_size_2;
double scale = 1.0;
AVLFG prng;
@@ -297,6 +315,7 @@ int main(int argc, char **argv)
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");
@@ -312,6 +331,10 @@ int main(int argc, char **argv)
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);
@@ -328,15 +351,15 @@ int main(int argc, char **argv)
switch (transform) {
case TRANSFORM_MDCT:
if (do_inverse) {
- imdct_ref((float *)tab_ref, (float *)tab1, fft_nbits);
- m->imdct_calc(m, tab2, (float *)tab1);
- err = check_diff((float *)tab_ref, tab2, fft_size, scale);
+ 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_nbits);
+ mdct_ref((FFTSample *)tab_ref, (FFTSample *)tab1, fft_nbits);
- m->mdct_calc(m, tab2, (float *)tab1);
+ m->mdct_calc(m, tab2, (FFTSample *)tab1);
- err = check_diff((float *)tab_ref, tab2, fft_size / 2, scale);
+ err = check_diff((FFTSample *)tab_ref, tab2, fft_size / 2, scale);
}
break;
case TRANSFORM_FFT:
@@ -345,8 +368,9 @@ int main(int argc, char **argv)
s->fft_calc(s, tab);
fft_ref(tab_ref, tab1, fft_nbits);
- err = check_diff((float *)tab_ref, (float *)tab, fft_size * 2, 1.0);
+ err = check_diff((FFTSample *)tab_ref, (FFTSample *)tab, fft_size * 2, 1.0);
break;
+#if CONFIG_FFT_FLOAT
case TRANSFORM_RDFT:
if (do_inverse) {
tab1[ 0].im = 0;
@@ -387,6 +411,7 @@ int main(int argc, char **argv)
}
err = check_diff((float *)tab_ref, (float *)tab, fft_size, 1.0);
break;
+#endif
}
/* do a speed test */
@@ -404,15 +429,16 @@ int main(int argc, char **argv)
switch (transform) {
case TRANSFORM_MDCT:
if (do_inverse) {
- m->imdct_calc(m, (float *)tab, (float *)tab1);
+ m->imdct_calc(m, (FFTSample *)tab, (FFTSample *)tab1);
} else {
- m->mdct_calc(m, (float *)tab, (float *)tab1);
+ 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);
@@ -421,6 +447,7 @@ int main(int argc, char **argv)
memcpy(tab2, tab1, fft_size * sizeof(FFTSample));
d->dct_calc(d, tab2);
break;
+#endif
}
}
duration = gettime() - time_start;
@@ -441,12 +468,14 @@ int main(int argc, char **argv)
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
}
av_free(tab);
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