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ffmpeg / libavcodec / mdct_tablegen.h @ 2912e87a

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/*
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 * Header file for hardcoded MDCT 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 Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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 <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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#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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#else
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#include "libavcodec/mdct_tables.h"
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#endif
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SINETABLE_CONST float * const ff_sine_windows[] = {
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    NULL, NULL, NULL, NULL, NULL, // unused
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    ff_sine_32 , ff_sine_64 ,
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    ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096
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};
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// Generate a sine window.
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av_cold void ff_sine_window_init(float *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] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
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}
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av_cold void ff_init_ff_sine_windows(int index) {
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    assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows));
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#if !CONFIG_HARDCODED_TABLES
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    ff_sine_window_init(ff_sine_windows[index], 1 << index);
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#endif
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}