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libavcodec/mdct_tablegen.h

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00001 /*
00002  * Header file for hardcoded MDCT tables
00003  *
00004  * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include <assert.h>
00024 // do not use libavutil/mathematics.h since this is compiled both
00025 // for the host and the target and config.h is only valid for the target
00026 #include <math.h>
00027 #include "../libavutil/attributes.h"
00028 
00029 #if !CONFIG_HARDCODED_TABLES
00030 SINETABLE(  32);
00031 SINETABLE(  64);
00032 SINETABLE( 128);
00033 SINETABLE( 256);
00034 SINETABLE( 512);
00035 SINETABLE(1024);
00036 SINETABLE(2048);
00037 SINETABLE(4096);
00038 #else
00039 #include "libavcodec/mdct_tables.h"
00040 #endif
00041 
00042 SINETABLE_CONST float * const ff_sine_windows[] = {
00043     NULL, NULL, NULL, NULL, NULL, // unused
00044     ff_sine_32 , ff_sine_64 ,
00045     ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096
00046 };
00047 
00048 // Generate a sine window.
00049 av_cold void ff_sine_window_init(float *window, int n) {
00050     int i;
00051     for(i = 0; i < n; i++)
00052         window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
00053 }
00054 
00055 av_cold void ff_init_ff_sine_windows(int index) {
00056     assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows));
00057 #if !CONFIG_HARDCODED_TABLES
00058     ff_sine_window_init(ff_sine_windows[index], 1 << index);
00059 #endif
00060 }

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