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/libavcodec/sinewin_tablegen.h

http://github.com/FFmpeg/FFmpeg
C Header | 83 lines | 51 code | 8 blank | 24 comment | 2 complexity | f122537d60947be1dc767d09d244cbd1 MD5 | raw file
 1/*
 2 * Header file for hardcoded sine windows
 3 *
 4 * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
 5 *
 6 * This file is part of FFmpeg.
 7 *
 8 * FFmpeg is free software; you can redistribute it and/or
 9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#ifndef AVCODEC_SINEWIN_TABLEGEN_H
24#define AVCODEC_SINEWIN_TABLEGEN_H
25
26#include <assert.h>
27// do not use libavutil/libm.h since this is compiled both
28// for the host and the target and config.h is only valid for the target
29#include <math.h>
30#include "libavcodec/aac_defines.h"
31#include "libavutil/attributes.h"
32#include "libavutil/common.h"
33
34#if !USE_FIXED
35SINETABLE120960(120);
36SINETABLE120960(960);
37#endif
38#if !CONFIG_HARDCODED_TABLES
39SINETABLE(  32);
40SINETABLE(  64);
41SINETABLE( 128);
42SINETABLE( 256);
43SINETABLE( 512);
44SINETABLE(1024);
45SINETABLE(2048);
46SINETABLE(4096);
47SINETABLE(8192);
48#else
49#if USE_FIXED
50#include "libavcodec/sinewin_fixed_tables.h"
51#else
52#include "libavcodec/sinewin_tables.h"
53#endif
54#endif
55
56#if USE_FIXED
57#define SIN_FIX(a) (int)floor((a) * 0x80000000 + 0.5)
58#else
59#define SIN_FIX(a) a
60#endif
61
62SINETABLE_CONST INTFLOAT * const AAC_RENAME(ff_sine_windows)[] = {
63    NULL, NULL, NULL, NULL, NULL, // unused
64    AAC_RENAME(ff_sine_32) , AAC_RENAME(ff_sine_64), AAC_RENAME(ff_sine_128),
65    AAC_RENAME(ff_sine_256), AAC_RENAME(ff_sine_512), AAC_RENAME(ff_sine_1024),
66    AAC_RENAME(ff_sine_2048), AAC_RENAME(ff_sine_4096), AAC_RENAME(ff_sine_8192),
67};
68
69// Generate a sine window.
70av_cold void AAC_RENAME(ff_sine_window_init)(INTFLOAT *window, int n) {
71    int i;
72    for(i = 0; i < n; i++)
73        window[i] = SIN_FIX(sinf((i + 0.5) * (M_PI / (2.0 * n))));
74}
75
76av_cold void AAC_RENAME(ff_init_ff_sine_windows)(int index) {
77    assert(index >= 0 && index < FF_ARRAY_ELEMS(AAC_RENAME(ff_sine_windows)));
78#if !CONFIG_HARDCODED_TABLES
79    AAC_RENAME(ff_sine_window_init)(AAC_RENAME(ff_sine_windows)[index], 1 << index);
80#endif
81}
82
83#endif /* AVCODEC_SINEWIN_TABLEGEN_H */