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/*
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 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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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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/**
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 * @file libavutil/internal.h
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 * common internal API header
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 */
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#ifndef AVUTIL_INTERNAL_H
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#define AVUTIL_INTERNAL_H
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#if !defined(DEBUG) && !defined(NDEBUG)
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#    define NDEBUG
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#endif
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#include <limits.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <assert.h>
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#include "config.h"
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#include "common.h"
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#include "mem.h"
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#include "timer.h"
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#ifndef attribute_align_arg
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#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,2)
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#    define attribute_align_arg __attribute__((force_align_arg_pointer))
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#else
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#    define attribute_align_arg
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#endif
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#endif
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#ifndef attribute_used
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#if AV_GCC_VERSION_AT_LEAST(3,1)
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#    define attribute_used __attribute__((used))
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#else
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#    define attribute_used
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#endif
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#endif
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#ifndef INT16_MIN
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#define INT16_MIN       (-0x7fff - 1)
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#endif
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#ifndef INT16_MAX
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#define INT16_MAX       0x7fff
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#endif
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#ifndef INT32_MIN
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#define INT32_MIN       (-0x7fffffff - 1)
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#endif
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#ifndef INT32_MAX
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#define INT32_MAX       0x7fffffff
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#endif
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#ifndef UINT32_MAX
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#define UINT32_MAX      0xffffffff
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#endif
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#ifndef INT64_MIN
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#define INT64_MIN       (-0x7fffffffffffffffLL - 1)
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#endif
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#ifndef INT64_MAX
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#define INT64_MAX INT64_C(9223372036854775807)
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#endif
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#ifndef UINT64_MAX
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#define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
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#endif
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#ifndef INT_BIT
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#    define INT_BIT (CHAR_BIT * sizeof(int))
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#endif
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#if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
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#    define PIC
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#endif
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#ifndef offsetof
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#    define offsetof(T, F) ((unsigned int)((char *)&((T *)0)->F))
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#endif
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/* Use to export labels from asm. */
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#define LABEL_MANGLE(a) EXTERN_PREFIX #a
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// Use rip-relative addressing if compiling PIC code on x86-64.
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#if ARCH_X86_64 && defined(PIC)
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#    define LOCAL_MANGLE(a) #a "(%%rip)"
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#else
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#    define LOCAL_MANGLE(a) #a
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#endif
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#define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
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/* debug stuff */
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/* dprintf macros */
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#ifdef DEBUG
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#    define dprintf(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
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#else
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#    define dprintf(pctx, ...)
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#endif
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#define av_abort()      do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
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/* math */
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extern const uint32_t ff_inverse[257];
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#if ARCH_X86
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#    define FASTDIV(a,b) \
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    ({\
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        int ret, dmy;\
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        __asm__ volatile(\
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            "mull %3"\
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            :"=d"(ret), "=a"(dmy)\
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            :"1"(a), "g"(ff_inverse[b])\
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            );\
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        ret;\
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    })
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#elif HAVE_ARMV6 && HAVE_INLINE_ASM
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static inline av_const int FASTDIV(int a, int b)
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{
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    int r, t;
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    __asm__ volatile("cmp     %3, #2               \n\t"
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                     "ldr     %1, [%4, %3, lsl #2] \n\t"
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                     "lsrle   %0, %2, #1           \n\t"
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                     "smmulgt %0, %1, %2           \n\t"
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                     : "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
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    return r;
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}
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#elif ARCH_ARM && HAVE_INLINE_ASM
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static inline av_const int FASTDIV(int a, int b)
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{
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    int r, t;
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    __asm__ volatile("umull %1, %0, %2, %3"
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                     : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
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    return r;
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}
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#elif 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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extern const uint8_t ff_sqrt_tab[256];
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static inline av_const unsigned int ff_sqrt(unsigned int a)
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{
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    unsigned int b;
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    if (a < 255) return (ff_sqrt_tab[a + 1] - 1) >> 4;
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    else if (a < (1 << 12)) b = ff_sqrt_tab[a >> 4] >> 2;
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#if !CONFIG_SMALL
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    else if (a < (1 << 14)) b = ff_sqrt_tab[a >> 6] >> 1;
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    else if (a < (1 << 16)) b = ff_sqrt_tab[a >> 8]   ;
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#endif
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    else {
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        int s = av_log2_16bit(a >> 16) >> 1;
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        unsigned int c = a >> (s + 2);
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        b = ff_sqrt_tab[c >> (s + 8)];
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        b = FASTDIV(c,b) + (b << s);
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    }
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    return b - (a < b * b);
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}
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#if ARCH_X86
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#define MASK_ABS(mask, level)\
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            __asm__ volatile(\
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                "cltd                   \n\t"\
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                "xorl %1, %0            \n\t"\
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                "subl %1, %0            \n\t"\
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                : "+a" (level), "=&d" (mask)\
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            );
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#else
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#define MASK_ABS(mask, level)\
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            mask  = level >> 31;\
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            level = (level ^ mask) - mask;
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#endif
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#if HAVE_CMOV
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#define COPY3_IF_LT(x, y, a, b, c, d)\
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__asm__ volatile(\
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    "cmpl  %0, %3       \n\t"\
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    "cmovl %3, %0       \n\t"\
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    "cmovl %4, %1       \n\t"\
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    "cmovl %5, %2       \n\t"\
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    : "+&r" (x), "+&r" (a), "+r" (c)\
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    : "r" (y), "r" (b), "r" (d)\
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);
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#else
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#define COPY3_IF_LT(x, y, a, b, c, d)\
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if ((y) < (x)) {\
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    (x) = (y);\
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    (a) = (b);\
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    (c) = (d);\
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}
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#endif
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/* avoid usage of dangerous/inappropriate system functions */
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#undef  malloc
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#define malloc please_use_av_malloc
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#undef  free
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#define free please_use_av_free
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#undef  realloc
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#define realloc please_use_av_realloc
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#undef  time
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#define time time_is_forbidden_due_to_security_issues
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#undef  rand
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#define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
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#undef  srand
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#define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
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#undef  random
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#define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
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#undef  sprintf
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#define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
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#undef  strcat
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#define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
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#undef  exit
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#define exit exit_is_forbidden
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#ifndef LIBAVFORMAT_BUILD
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#undef  printf
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#define printf please_use_av_log_instead_of_printf
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#undef  fprintf
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#define fprintf please_use_av_log_instead_of_fprintf
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#undef  puts
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#define puts please_use_av_log_instead_of_puts
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#undef  perror
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#define perror please_use_av_log_instead_of_perror
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#endif
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#define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
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{\
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    p = av_malloc(size);\
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    if (p == NULL && (size) != 0) {\
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        av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
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        goto label;\
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    }\
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}
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#define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
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{\
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    p = av_mallocz(size);\
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    if (p == NULL && (size) != 0) {\
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        av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
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        goto label;\
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    }\
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}
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#if !HAVE_LLRINT
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static av_always_inline av_const long long llrint(double x)
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{
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    return rint(x);
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}
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#endif /* HAVE_LLRINT */
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#if !HAVE_LOG2
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static av_always_inline av_const double log2(double x)
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{
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    return log(x) * 1.44269504088896340736;
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}
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#endif /* HAVE_LOG2 */
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#if !HAVE_LRINT
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static av_always_inline av_const long int lrint(double x)
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{
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    return rint(x);
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}
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#endif /* HAVE_LRINT */
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#if !HAVE_LRINTF
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static av_always_inline av_const long int lrintf(float x)
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{
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    return (int)(rint(x));
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}
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#endif /* HAVE_LRINTF */
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#if !HAVE_ROUND
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static av_always_inline av_const double round(double x)
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{
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    return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
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}
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#endif /* HAVE_ROUND */
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#if !HAVE_ROUNDF
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static av_always_inline av_const float roundf(float x)
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{
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    return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
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}
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#endif /* HAVE_ROUNDF */
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#if !HAVE_TRUNCF
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static av_always_inline av_const float truncf(float x)
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{
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    return (x > 0) ? floor(x) : ceil(x);
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}
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#endif /* HAVE_TRUNCF */
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/**
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 * Returns NULL if CONFIG_SMALL is true, otherwise the argument
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 * without modification. Used to disable the definition of strings
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 * (for example AVCodec long_names).
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 */
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#if CONFIG_SMALL
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#   define NULL_IF_CONFIG_SMALL(x) NULL
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#else
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#   define NULL_IF_CONFIG_SMALL(x) x
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#endif
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#endif /* AVUTIL_INTERNAL_H */