/* * Header file for hardcoded AAC cube-root table * * Copyright (c) 2010 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 */ #ifndef AVCODEC_CBRT_TABLEGEN_H #define AVCODEC_CBRT_TABLEGEN_H #include <stdint.h> #include <math.h> #if CONFIG_HARDCODED_TABLES #define cbrt_tableinit() #include "libavcodec/cbrt_tables.h" #else static uint32_t cbrt_tab[1 << 13]; static void cbrt_tableinit(void) { if (!cbrt_tab[(1<<13) - 1]) { int i; /* cbrtf() isn't available on all systems, so we use powf(). */ for (i = 0; i < 1<<13; i++) { union { float f; uint32_t i; } f; f.f = pow(i, 1.0 / 3.0) * i; cbrt_tab[i] = f.i; } } } #endif /* CONFIG_HARDCODED_TABLES */ #endif /* AVCODEC_CBRT_TABLEGEN_H */