#ifndef _AVUTIL_INTMATH_H_a61f5aa8_
#define _AVUTIL_INTMATH_H_a61f5aa8_

/*
 * This file was stolen from ffmpeg and modified for usability here.
 *  The original is
 * 
 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
 *
 * This version is a derivative work of that version.  It is not free
 *  software; it is licensed under the GNU Lesser General Public
 *  License version 2.1, which places nontrivial restrictions on what
 *  may be done with it.  (I'm not terribly happy about that, but for
 *  my purposes accepting LGPL-infected code is a lower price than
 *  reimplementing it all myself.)
 *
 * The LGPL v2.1 as distributed with ffmpeg is in the accompanying file
 *  `LGPL-v2.1'.
 */

#if 0

#include <stdint.h>
#include "config.h"
#include "attributes.h"

#endif

/**
 * @addtogroup lavu_internal
 * @{
 */

extern const uint32_t ff_inverse[257];

#if   ARCH_ARM
#   include "arm/intmath.h"
#elif ARCH_X86
#   include "x86/intmath.h"
#endif

#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) */

#ifndef FASTDIV
#   if CONFIG_FASTDIV
#       define FASTDIV(a,b) ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32))
#   else
#       define FASTDIV(a,b) ((a) / (b))
#   endif
#endif /* FASTDIV */

#include "avutil-common.h" // XXX why is this clear down here rather than up at the top?!

extern const uint8_t ff_sqrt_tab[256];

static inline av_const unsigned int ff_sqrt(unsigned int a)
{
    unsigned int b;

    if (a < 255) return (ff_sqrt_tab[a + 1] - 1) >> 4;
    else if (a < (1 << 12)) b = ff_sqrt_tab[a >> 4] >> 2;
#if !CONFIG_SMALL
    else if (a < (1 << 14)) b = ff_sqrt_tab[a >> 6] >> 1;
    else if (a < (1 << 16)) b = ff_sqrt_tab[a >> 8]   ;
#endif
    else {
        int s = av_log2_16bit(a >> 16) >> 1;
        unsigned int c = a >> (s + 2);
        b = ff_sqrt_tab[c >> (s + 8)];
        b = FASTDIV(c,b) + (b << s);
    }

    return b - (a < b * b);
}

#endif