libflac/internal.h

/*
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
 * 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
 */

/**
 * @file libavutil/internal.h
 * common internal API header
 */

#ifndef AVUTIL_INTERNAL_H
#define AVUTIL_INTERNAL_H

#if !defined(DEBUG) && !defined(NDEBUG)
#    define NDEBUG
#endif

#include <limits.h>
#include "common.h"

#ifndef attribute_align_arg
#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,2)
#    define attribute_align_arg __attribute__((force_align_arg_pointer))
#else
#    define attribute_align_arg
#endif
#endif

#ifndef attribute_used
#if AV_GCC_VERSION_AT_LEAST(3,1)
#    define attribute_used __attribute__((used))
#else
#    define attribute_used
#endif
#endif

#ifndef INT16_MIN
#define INT16_MIN       (-0x7fff - 1)
#endif

#ifndef INT16_MAX
#define INT16_MAX       0x7fff
#endif

#ifndef INT32_MIN
#define INT32_MIN       (-0x7fffffff - 1)
#endif

#ifndef INT32_MAX
#define INT32_MAX       0x7fffffff
#endif

#ifndef UINT32_MAX
#define UINT32_MAX      0xffffffff
#endif

#ifndef INT64_MIN
#define INT64_MIN       (-0x7fffffffffffffffLL - 1)
#endif

#ifndef INT64_MAX
#define INT64_MAX INT64_C(9223372036854775807)
#endif

#ifndef UINT64_MAX
#define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
#endif

#ifndef INT_BIT
#    define INT_BIT (CHAR_BIT * sizeof(int))
#endif

#ifndef offsetof
#    define offsetof(T, F) ((unsigned int)((char *)&((T *)0)->F))
#endif

/* Use to export labels from asm. */
#define LABEL_MANGLE(a) EXTERN_PREFIX #a

// Use rip-relative addressing if compiling PIC code on x86-64.
#if ARCH_X86_64 && defined(PIC)
#    define LOCAL_MANGLE(a) #a "(%%rip)"
#else
#    define LOCAL_MANGLE(a) #a
#endif

#define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)

/* math */

extern const uint32_t ff_inverse[257];

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

const uint8_t ff_sqrt_tab[256]={
  0, 16, 23, 28, 32, 36, 40, 43, 46, 48, 51, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 77, 79, 80, 82, 84, 85, 87, 88, 90,
 91, 92, 94, 95, 96, 98, 99,100,102,103,104,105,107,108,109,110,111,112,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,144,145,146,147,148,149,150,151,151,152,153,154,155,156,156,
157,158,159,160,160,161,162,163,164,164,165,166,167,168,168,169,170,171,171,172,173,174,174,175,176,176,177,178,179,179,180,181,
182,182,183,184,184,185,186,186,187,188,188,189,190,190,191,192,192,193,194,194,195,196,196,197,198,198,199,200,200,201,202,202,
203,204,204,205,205,206,207,207,208,208,209,210,210,211,212,212,213,213,214,215,215,216,216,217,218,218,219,219,220,220,221,222,
222,223,223,224,224,225,226,226,227,227,228,228,229,230,230,231,231,232,232,233,233,234,235,235,236,236,237,237,238,238,239,239,
240,240,241,242,242,243,243,244,244,245,245,246,246,247,247,248,248,249,249,250,250,251,251,252,252,253,253,254,254,255,255,255
};


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);
}

#if ARCH_X86
#define MASK_ABS(mask, level)\
            __asm__ volatile(\
                "cltd                   \n\t"\
                "xorl %1, %0            \n\t"\
                "subl %1, %0            \n\t"\
                : "+a" (level), "=&d" (mask)\
            );
#else
#define MASK_ABS(mask, level)\
            mask  = level >> 31;\
            level = (level ^ mask) - mask;
#endif

#if HAVE_CMOV
#define COPY3_IF_LT(x, y, a, b, c, d)\
__asm__ volatile(\
    "cmpl  %0, %3       \n\t"\
    "cmovl %3, %0       \n\t"\
    "cmovl %4, %1       \n\t"\
    "cmovl %5, %2       \n\t"\
    : "+&r" (x), "+&r" (a), "+r" (c)\
    : "r" (y), "r" (b), "r" (d)\
);
#else
#define COPY3_IF_LT(x, y, a, b, c, d)\
if ((y) < (x)) {\
    (x) = (y);\
    (a) = (b);\
    (c) = (d);\
}
#endif

#define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
{\
    p = av_malloc(size);\
    if (p == NULL && (size) != 0) {\
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
        goto label;\
    }\
}

#define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
{\
    p = av_mallocz(size);\
    if (p == NULL && (size) != 0) {\
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
        goto label;\
    }\
}

#define NULL_IF_CONFIG_SMALL(x) x

#endif /* AVUTIL_INTERNAL_H */