/* * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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" #include "dict.h" #ifndef attribute_align_arg #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2) # define attribute_align_arg __attribute__((force_align_arg_pointer)) #else # define attribute_align_arg #endif #endif #if defined(_MSC_VER) && CONFIG_SHARED # define av_export __declspec(dllimport) #else # define av_export #endif #ifndef INT_BIT # define INT_BIT (CHAR_BIT * sizeof(int)) #endif // Some broken preprocessors need a second expansion // to be forced to tokenize __VA_ARGS__ #define E1(x) x #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \ uint8_t la_##v[sizeof(t s o) + (a)]; \ t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a) #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \ DECLARE_ALIGNED(a, t, la_##v) s o; \ t (*v) o = la_##v #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,)) #if HAVE_LOCAL_ALIGNED_8 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,)) #else # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__) #endif #if HAVE_LOCAL_ALIGNED_16 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,)) #else # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__) #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 * Libav 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 /** * Return 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 #if HAVE_MMX_INLINE /** * Empty mmx state. * this must be called between any dsp function and float/double code. * for example sin(); dsp->idct_put(); emms_c(); cos() */ static av_always_inline void emms_c(void) { __asm__ volatile ("emms" ::: "memory"); } #elif HAVE_MMX && HAVE_MM_EMPTY # include <mmintrin.h> # define emms_c _mm_empty #elif HAVE_MMX && HAVE_YASM # include "libavutil/x86/emms.h" # define emms_c avpriv_emms_yasm #else # define emms_c() #endif /* HAVE_MMX_INLINE */ #endif /* AVUTIL_INTERNAL_H */