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08be74ac81
Add fixed point implementation of functions for generating tables Signed-off-by: Nedeljko Babic <nedeljko.babic@imgtec.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/*
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* Header file for hardcoded sine windows
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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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#ifndef AVCODEC_SINEWIN_TABLEGEN_H
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#define AVCODEC_SINEWIN_TABLEGEN_H
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#include <assert.h>
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// do not use libavutil/libm.h since this is compiled both
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// for the host and the target and config.h is only valid for the target
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#include <math.h>
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#include "libavutil/attributes.h"
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#include "libavutil/common.h"
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#if !CONFIG_HARDCODED_TABLES
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SINETABLE( 32);
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SINETABLE( 64);
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SINETABLE( 128);
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SINETABLE( 256);
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SINETABLE( 512);
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SINETABLE(1024);
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SINETABLE(2048);
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SINETABLE(4096);
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SINETABLE(8192);
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#else
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#if USE_FIXED
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#include "libavcodec/sinewin_fixed_tables.h"
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#else
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#include "libavcodec/sinewin_tables.h"
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#endif
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#endif
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#if USE_FIXED
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#define SINEWIN_SUFFIX(a) a ## _fixed
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#define INTFLOAT int
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#define SIN_FIX(a) (int)floor((a) * 0x80000000 + 0.5)
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#else
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#define SINEWIN_SUFFIX(a) a
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#define INTFLOAT float
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#define SIN_FIX(a) a
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#endif
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SINETABLE_CONST INTFLOAT * const SINEWIN_SUFFIX(ff_sine_windows)[] = {
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NULL, NULL, NULL, NULL, NULL, // unused
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SINEWIN_SUFFIX(ff_sine_32) , SINEWIN_SUFFIX(ff_sine_64), SINEWIN_SUFFIX(ff_sine_128),
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SINEWIN_SUFFIX(ff_sine_256), SINEWIN_SUFFIX(ff_sine_512), SINEWIN_SUFFIX(ff_sine_1024),
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SINEWIN_SUFFIX(ff_sine_2048), SINEWIN_SUFFIX(ff_sine_4096), SINEWIN_SUFFIX(ff_sine_8192)
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};
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// Generate a sine window.
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av_cold void SINEWIN_SUFFIX(ff_sine_window_init)(INTFLOAT *window, int n) {
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int i;
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for(i = 0; i < n; i++)
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window[i] = SIN_FIX(sinf((i + 0.5) * (M_PI / (2.0 * n))));
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}
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av_cold void SINEWIN_SUFFIX(ff_init_ff_sine_windows)(int index) {
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assert(index >= 0 && index < FF_ARRAY_ELEMS(SINEWIN_SUFFIX(ff_sine_windows)));
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#if !CONFIG_HARDCODED_TABLES
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SINEWIN_SUFFIX(ff_sine_window_init)(SINEWIN_SUFFIX(ff_sine_windows)[index], 1 << index);
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#endif
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}
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#endif /* AVCODEC_SINEWIN_TABLEGEN_H */
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