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148 lines
4.0 KiB
148 lines
4.0 KiB
/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 |
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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 "attributes.h" |
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#include "timer.h" |
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#include "dict.h" |
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#ifndef attribute_align_arg |
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#if ARCH_X86_32 && 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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#if defined(_MSC_VER) && CONFIG_SHARED |
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# define av_export __declspec(dllimport) |
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#else |
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# define av_export |
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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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#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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#include "libm.h" |
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/** |
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* Return 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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/** |
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* Define a function with only the non-default version specified. |
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* |
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* On systems with ELF shared libraries, all symbols exported from |
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* Libav libraries are tagged with the name and major version of the |
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* library to which they belong. If a function is moved from one |
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* library to another, a wrapper must be retained in the original |
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* location to preserve binary compatibility. |
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* |
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* Functions defined with this macro will never be used to resolve |
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* symbols by the build-time linker. |
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* |
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* @param type return type of function |
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* @param name name of function |
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* @param args argument list of function |
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* @param ver version tag to assign function |
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*/ |
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#if HAVE_SYMVER_ASM_LABEL |
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# define FF_SYMVER(type, name, args, ver) \ |
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type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \ |
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type ff_##name args |
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#elif HAVE_SYMVER_GNU_ASM |
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# define FF_SYMVER(type, name, args, ver) \ |
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__asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \ |
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type ff_##name args; \ |
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type ff_##name args |
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#endif |
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/** |
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* Return NULL if a threading library has not been enabled. |
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* Used to disable threading functions in AVCodec definitions |
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* when not needed. |
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*/ |
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#if HAVE_THREADS |
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# define ONLY_IF_THREADS_ENABLED(x) x |
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#else |
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# define ONLY_IF_THREADS_ENABLED(x) NULL |
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#endif |
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#if HAVE_MMX_INLINE |
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/** |
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* Empty mmx state. |
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* this must be called between any dsp function and float/double code. |
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* for example sin(); dsp->idct_put(); emms_c(); cos() |
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*/ |
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static av_always_inline void emms_c(void) |
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{ |
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__asm__ volatile ("emms" ::: "memory"); |
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} |
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#elif HAVE_MMX && HAVE_MM_EMPTY |
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# include <mmintrin.h> |
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# define emms_c _mm_empty |
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#else |
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# define emms_c() |
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#endif /* HAVE_MMX_INLINE */ |
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#endif /* AVUTIL_INTERNAL_H */
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