1/* 2 * Header file for hardcoded sine windows 3 * 4 * Copyright (c) 2009 Reimar D��ffinger <Reimar.Doeffinger@gmx.de> 5 * 6 * This file is part of Libav. 7 * 8 * Libav 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 * Libav 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 Libav; 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 "libavutil/attributes.h" 31 32#if !CONFIG_HARDCODED_TABLES 33SINETABLE( 32); 34SINETABLE( 64); 35SINETABLE( 128); 36SINETABLE( 256); 37SINETABLE( 512); 38SINETABLE(1024); 39SINETABLE(2048); 40SINETABLE(4096); 41#else 42#include "libavcodec/sinewin_tables.h" 43#endif 44 45SINETABLE_CONST float * const ff_sine_windows[] = { 46 NULL, NULL, NULL, NULL, NULL, // unused 47 ff_sine_32 , ff_sine_64 , 48 ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096 49}; 50 51// Generate a sine window. 52av_cold void ff_sine_window_init(float *window, int n) { 53 int i; 54 for(i = 0; i < n; i++) 55 window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n))); 56} 57 58av_cold void ff_init_ff_sine_windows(int index) { 59 assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows)); 60#if !CONFIG_HARDCODED_TABLES 61 ff_sine_window_init(ff_sine_windows[index], 1 << index); 62#endif 63} 64 65#endif /* AVCODEC_SINEWIN_TABLEGEN_H */ 66