log.h
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上传日期:2022-06-20
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- /*
- * 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
- */
- #ifndef AVUTIL_LOG_H
- #define AVUTIL_LOG_H
- #include <stdarg.h>
- #include "avutil.h"
- /**
- * Describes the class of an AVClass context structure, that is an
- * arbitrary struct of which the first field is a pointer to an
- * AVClass struct (e.g. AVCodecContext, AVFormatContext etc.).
- */
- typedef struct AVCLASS AVClass;
- struct AVCLASS {
- /**
- * The name of the class; usually it is the same name as the
- * context structure type to which the AVClass is associated.
- */
- const char* class_name;
- /**
- * a pointer to a function which returns the name of a context
- * instance p ctx associated with the class
- */
- const char* (*item_name)(void* ctx);
- /**
- * a pointer to the first option specified in the class if any or NULL
- *
- * @see av_set_default_options()
- */
- const struct AVOption *option;
- };
- /* av_log API */
- #if LIBAVUTIL_VERSION_INT < (50<<16)
- #define AV_LOG_QUIET -1
- #define AV_LOG_FATAL 0
- #define AV_LOG_ERROR 0
- #define AV_LOG_WARNING 1
- #define AV_LOG_INFO 1
- #define AV_LOG_VERBOSE 1
- #define AV_LOG_DEBUG 2
- #else
- #define AV_LOG_QUIET -8
- /**
- * something went really wrong and we will crash now
- */
- #define AV_LOG_PANIC 0
- /**
- * something went wrong and recovery is not possible
- * like no header in a format which depends on it or a combination
- * of parameters which are not allowed
- */
- #define AV_LOG_FATAL 8
- /**
- * something went wrong and cannot losslessly be recovered
- * but not all future data is affected
- */
- #define AV_LOG_ERROR 16
- /**
- * something somehow does not look correct / something which may or may not
- * lead to some problems like use of -vstrict -2
- */
- #define AV_LOG_WARNING 24
- #define AV_LOG_INFO 32
- #define AV_LOG_VERBOSE 40
- /**
- * stuff which is only useful for libav* developers
- */
- #define AV_LOG_DEBUG 48
- #endif
- #if LIBAVUTIL_VERSION_INT < (50<<16)
- extern int av_log_level;
- #endif
- /**
- * Send the specified message to the log if the level is less than or equal to
- * the current av_log_level. By default, all logging messages are sent to
- * stderr. This behavior can be altered by setting a different av_vlog callback
- * function.
- *
- * @param avcl A pointer to an arbitrary struct of which the first field is a
- * pointer to an AVClass struct.
- * @param level The importance level of the message, lower values signifying
- * higher importance.
- * @param fmt The format string (printf-compatible) that specifies how
- * subsequent arguments are converted to output.
- * @see av_vlog
- */
- #ifdef __GNUC__
- void av_log(void*, int level, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 3, 4)));
- #else
- void av_log(void*, int level, const char *fmt, ...);
- #endif
- void av_vlog(void*, int level, const char *fmt, va_list);
- int av_log_get_level(void);
- void av_log_set_level(int);
- void av_log_set_callback(void (*)(void*, int, const char*, va_list));
- void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl);
- #endif /* AVUTIL_LOG_H */