From c26bce1070a409ae2fefce8fb43d26228d108f7e Mon Sep 17 00:00:00 2001 From: Reimar Döffinger Date: Sun, 14 Mar 2010 19:59:47 +0000 Subject: Allow hard-coding of the 32kB cubic-root table for AAC. Originally committed as revision 22527 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/cbrt_tablegen.h | 51 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 libavcodec/cbrt_tablegen.h (limited to 'libavcodec/cbrt_tablegen.h') diff --git a/libavcodec/cbrt_tablegen.h b/libavcodec/cbrt_tablegen.h new file mode 100644 index 0000000000..930e513705 --- /dev/null +++ b/libavcodec/cbrt_tablegen.h @@ -0,0 +1,51 @@ +/* + * Header file for hardcoded AAC cube-root table + * + * Copyright (c) 2010 Reimar Döffinger + * + * 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 CBRT_TABLEGEN_H +#define CBRT_TABLEGEN_H + +#include +#include + +#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; + for (i = 0; i < 1<<13; i++) { + union { + float f; + uint32_t i; + } f; + f.f = cbrtf(i) * i; + cbrt_tab[i] = f.i; + } + } +} +#endif /* CONFIG_HARDCODED_TABLES */ + +#endif /* CBRT_TABLEGEN_H */ -- cgit v1.2.3