1/* 2 * Header file for hardcoded MDCT tables 3 * 4 * Copyright (c) 2009 Reimar D��ffinger <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#include <assert.h> 24// do not use libavutil/mathematics.h since this is compiled both 25// for the host and the target and config.h is only valid for the target 26#include <math.h> 27#include "../libavutil/attributes.h" 28 29#if !CONFIG_HARDCODED_TABLES 30SINETABLE( 32); 31SINETABLE( 64); 32SINETABLE( 128); 33SINETABLE( 256); 34SINETABLE( 512); 35SINETABLE(1024); 36SINETABLE(2048); 37SINETABLE(4096); 38#else 39#include "libavcodec/mdct_tables.h" 40#endif 41 42SINETABLE_CONST float * const ff_sine_windows[] = { 43 NULL, NULL, NULL, NULL, NULL, // unused 44 ff_sine_32 , ff_sine_64 , 45 ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096 46}; 47 48// Generate a sine window. 49av_cold void ff_sine_window_init(float *window, int n) { 50 int i; 51 for(i = 0; i < n; i++) 52 window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n))); 53} 54 55av_cold void ff_init_ff_sine_windows(int index) { 56 assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows)); 57#if !CONFIG_HARDCODED_TABLES 58 ff_sine_window_init(ff_sine_windows[index], 1 << index); 59#endif 60} 61