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ffmpeg / libavutil / intmath.h @ 80a07f6e

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/*
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 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVUTIL_INTMATH_H
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#define AVUTIL_INTMATH_H
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#include "config.h"
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#include "common.h"
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extern const uint32_t ff_inverse[257];
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#if   ARCH_ARM
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#   include "arm/intmath.h"
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#elif ARCH_X86
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#   include "x86/intmath.h"
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#endif
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#if HAVE_FAST_CLZ && AV_GCC_VERSION_AT_LEAST(3,4)
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#ifndef av_log2
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#define av_log2(x) (31 - __builtin_clz((x)|1))
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#ifndef av_log2_16bit
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#define av_log2_16bit av_log2
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#endif
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#endif /* av_log2 */
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#endif /* AV_GCC_VERSION_AT_LEAST(3,4) */
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#ifndef FASTDIV
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#if CONFIG_FASTDIV
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#    define FASTDIV(a,b)   ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32))
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#else
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#    define FASTDIV(a,b)   ((a) / (b))
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#endif
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#endif /* FASTDIV */
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#endif /* AVUTIL_INTMATH_H */