libavutil/log.h

   1 /*
   2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef AVUTIL_LOG_H
  22 #define AVUTIL_LOG_H
  23
  24 #include <stdarg.h>
  25 #include "avutil.h"
  26
  27 /**
  28  * Describes the class of an AVClass context structure. That is an
  29  * arbitrary struct of which the first field is a pointer to an
  30  * AVClass struct (e.g. AVCodecContext, AVFormatContext etc.).
  31  */
  32 typedef struct {
  33     /**
  34      * The name of the class; usually it is the same name as the
  35      * context structure type to which the AVClass is associated.
  36      */
  37     const char* class_name;
  38
  39     /**
  40      * A pointer to a function which returns the name of a context
  41      * instance ctx associated with the class.
  42      */
  43     const char* (*item_name)(void* ctx);
  44
  45     /**
  46      * a pointer to the first option specified in the class if any or NULL
  47      *
  48      * @see av_set_default_options()
  49      */
  50     const struct AVOption *option;
  51 } AVClass;
  52
  53 /* av_log API */
  54
  55 #define AV_LOG_QUIET    -8
  56
  57 /**
  58  * Something went really wrong and we will crash now.
  59  */
  60 #define AV_LOG_PANIC     0
  61
  62 /**
  63  * Something went wrong and recovery is not possible.
  64  * For example, no header was found for a format which depends
  65  * on headers or an illegal combination of parameters is used.
  66  */
  67 #define AV_LOG_FATAL     8
  68
  69 /**
  70  * Something went wrong and cannot losslessly be recovered.
  71  * However, not all future data is affected.
  72  */
  73 #define AV_LOG_ERROR    16
  74
  75 /**
  76  * Something somehow does not look correct. This may or may not
  77  * lead to problems. An example would be the use of '-vstrict -2'.
  78  */
  79 #define AV_LOG_WARNING  24
  80
  81 #define AV_LOG_INFO     32
  82 #define AV_LOG_VERBOSE  40
  83
  84 /**
  85  * Stuff which is only useful for libav* developers.
  86  */
  87 #define AV_LOG_DEBUG    48
  88
  89 /**
  90  * Sends the specified message to the log if the level is less than or equal
  91  * to the current av_log_level. By default, all logging messages are sent to
  92  * stderr. This behavior can be altered by setting a different av_vlog callback
  93  * function.
  94  *
  95  * @param avcl A pointer to an arbitrary struct of which the first field is a
  96  * pointer to an AVClass struct.
  97  * @param level The importance level of the message, lower values signifying
  98  * higher importance.
  99  * @param fmt The format string (printf-compatible) that specifies how
 100  * subsequent arguments are converted to output.
 101  * @see av_vlog
 102  */
 103 #ifdef __GNUC__
 104 void av_log(void*, int level, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 3, 4)));
 105 #else
 106 void av_log(void*, int level, const char *fmt, ...);
 107 #endif
 108
 109 void av_vlog(void*, int level, const char *fmt, va_list);
 110 int av_log_get_level(void);
 111 void av_log_set_level(int);
 112 void av_log_set_callback(void (*)(void*, int, const char*, va_list));
 113 void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl);
 114
 115 #endif /* AVUTIL_LOG_H */