PeerStreamer

/*

 * 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

 * common internal API header

 */

#ifndef AVUTIL_INTERNAL_H

#define AVUTIL_INTERNAL_H

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

#    define NDEBUG

#endif

#include <limits.h>

#include <stdint.h>

#include <stddef.h>

#include <assert.h>

#include "config.h"

#include "attributes.h"

#include "timer.h"

#ifndef attribute_align_arg

#if ARCH_X86_32 && (!defined(__INTEL_COMPILER) || __INTEL_COMPILER > 1200) && AV_GCC_VERSION_AT_LEAST(4,2)

#    define attribute_align_arg __attribute__((force_align_arg_pointer))

#else

#    define attribute_align_arg

#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)

/* debug stuff */

#define av_abort()      do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)

/* math */

#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

/* avoid usage of dangerous/inappropriate system functions */

#undef  malloc

#define malloc please_use_av_malloc

#undef  free

#define free please_use_av_free

#undef  realloc

#define realloc please_use_av_realloc

#undef  time

#define time time_is_forbidden_due_to_security_issues

#undef  rand

#define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get

#undef  srand

#define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init

#undef  random

#define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get

#undef  sprintf

#define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf

#undef  strcat

#define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat

#undef  exit

#define exit exit_is_forbidden

#ifndef LIBAVFORMAT_BUILD

#undef  printf

#define printf please_use_av_log_instead_of_printf

#undef  fprintf

#define fprintf please_use_av_log_instead_of_fprintf

#undef  puts

#define puts please_use_av_log_instead_of_puts

#undef  perror

#define perror please_use_av_log_instead_of_perror

#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;\

    }\

}

#include "libm.h"

/**

 * Return NULL if CONFIG_SMALL is true, otherwise the argument

 * without modification. Used to disable the definition of strings

 * (for example AVCodec long_names).

 */

#if CONFIG_SMALL

#   define NULL_IF_CONFIG_SMALL(x) NULL

#else

#   define NULL_IF_CONFIG_SMALL(x) x

#endif

/**

 * Define a function with only the non-default version specified.

 *

 * On systems with ELF shared libraries, all symbols exported from

 * FFmpeg libraries are tagged with the name and major version of the

 * library to which they belong.  If a function is moved from one

 * library to another, a wrapper must be retained in the original

 * location to preserve binary compatibility.

 *

 * Functions defined with this macro will never be used to resolve

 * symbols by the build-time linker.

 *

 * @param type return type of function

 * @param name name of function

 * @param args argument list of function

 * @param ver  version tag to assign function

 */

#if HAVE_SYMVER_ASM_LABEL

#   define FF_SYMVER(type, name, args, ver)                     \

    type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver);  \

    type ff_##name args

#elif HAVE_SYMVER_GNU_ASM

#   define FF_SYMVER(type, name, args, ver)                             \

    __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver);      \

    type ff_##name args;                                                \

    type ff_##name args

#endif

/**

 * Returns NULL if a threading library has not been enabled.

 * Used to disable threading functions in AVCodec definitions

 * when not needed.

 */

#if HAVE_THREADS

#   define ONLY_IF_THREADS_ENABLED(x) x

#else

#   define ONLY_IF_THREADS_ENABLED(x) NULL

#endif

#endif /* AVUTIL_INTERNAL_H */