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libavcodec
cos_tablegen.c
Go to the documentation of this file.
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/*
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* Generate a header file for hardcoded ff_cos_* tables
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*
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* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#define BITS 16
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#define FLOATFMT "%.18e"
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#define FIXEDFMT "%6d"
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static
int
clip_f15
(
int
v
)
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{
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return
v < -32767 ? -32767 :
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v > 32767 ? 32767 :
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v
;
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}
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static
void
printval
(
double
val
,
int
fixed)
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{
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if
(fixed) {
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/* lrint() isn't always available, so round and cast manually. */
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double
new_val = val * (double) (1 << 15);
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new_val = new_val >= 0 ? floor(new_val + 0.5) : ceil(new_val - 0.5);
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printf(
" "
FIXEDFMT
","
,
clip_f15
((
long
int
) new_val));
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}
else
{
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printf(
" "
FLOATFMT
","
, val);
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}
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}
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int
main
(
int
argc,
char
*argv[])
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{
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int
i, j;
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int
do_sin = argc > 1 && !strcmp(argv[1],
"sin"
);
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int
fixed = argc > 1 && strstr(argv[1],
"fixed"
);
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double (*
func
)(double) = do_sin ? sin : cos;
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printf(
"/* This file was automatically generated. */\n"
);
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printf(
"#define CONFIG_FFT_FLOAT %d\n"
, !fixed);
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printf(
"#include \"libavcodec/%s\"\n"
, do_sin ?
"rdft.h"
:
"fft.h"
);
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for
(i = 4; i <=
BITS
; i++) {
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int
m
= 1 << i;
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double
freq = 2*3.14159265358979323846/
m
;
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printf(
"%s(%i) = {\n "
, do_sin ?
"SINTABLE"
:
"COSTABLE"
, m);
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for
(j = 0; j < m/2 - 1; j++) {
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int
idx = j > m/4 ? m/2 - j : j;
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if
(do_sin && j >= m/4)
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idx = m/4 - j;
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printval
(
func
(idx*freq), fixed);
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if
((j & 3) == 3)
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printf(
"\n "
);
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}
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printval
(
func
(do_sin ? -(m/4 - 1)*freq : freq), fixed);
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printf(
"\n};\n"
);
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}
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return
0;
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}
val
const char const char void * val
Definition:
avisynth_c.h:671
v
float v
Definition:
avf_showspectrum.c:88
FLOATFMT
#define FLOATFMT
Definition:
cos_tablegen.c:28
clip_f15
static int clip_f15(int v)
Definition:
cos_tablegen.c:31
m
unsigned m
Definition:
audioconvert.c:186
FIXEDFMT
#define FIXEDFMT
Definition:
cos_tablegen.c:29
BITS
#define BITS
Definition:
cos_tablegen.c:27
func
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition:
jacosubdec.c:70
printval
static void printval(double val, int fixed)
Definition:
cos_tablegen.c:38
main
int main(int argc, char **argv)
Definition:
main.c:22
Generated on Tue Dec 3 2013 09:58:03 for FFmpeg by
1.8.5