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Diffstat (limited to 'libavutil/intmath.h')
-rw-r--r-- | libavutil/intmath.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/libavutil/intmath.h b/libavutil/intmath.h new file mode 100644 index 0000000000..39e14c28ae --- /dev/null +++ b/libavutil/intmath.h @@ -0,0 +1,41 @@ +/* + * Copyright (c) 2010 Mans Rullgard <mans@mansr.com> + * + * 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 AVUTIL_INTMATH_H +#define AVUTIL_INTMATH_H + +#include "config.h" +#include "common.h" + +#if HAVE_FAST_CLZ && AV_GCC_VERSION_AT_LEAST(3,4) + +#ifndef av_log2 + +#define av_log2(x) (31 - __builtin_clz((x)|1)) + +#ifndef av_log2_16bit +#define av_log2_16bit av_log2 +#endif + +#endif /* av_log2 */ + +#endif /* AV_GCC_VERSION_AT_LEAST(3,4) */ + +#endif /* AVUTIL_INTMATH_H */ |