/* * Header file for hardcoded MDCT tables * * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <assert.h> // do not use libavutil/libm.h since this is compiled both // for the host and the target and config.h is only valid for the target #include <math.h> #include "libavutil/attributes.h" #if !CONFIG_HARDCODED_TABLES SINETABLE( 32); SINETABLE( 64); SINETABLE( 128); SINETABLE( 256); SINETABLE( 512); SINETABLE(1024); SINETABLE(2048); SINETABLE(4096); #else #include "libavcodec/mdct_tables.h" #endif SINETABLE_CONST float * const ff_sine_windows[] = { NULL, NULL, NULL, NULL, NULL, // unused ff_sine_32 , ff_sine_64 , ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096 }; // Generate a sine window. av_cold void ff_sine_window_init(float *window, int n) { int i; for(i = 0; i < n; i++) window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n))); } av_cold void ff_init_ff_sine_windows(int index) { assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows)); #if !CONFIG_HARDCODED_TABLES ff_sine_window_init(ff_sine_windows[index], 1 << index); #endif }