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 AVCLASS AVClass;
  33 struct AVCLASS {
  34     /**
  35      * The name of the class; usually it is the same name as the
  36      * context structure type to which the AVClass is associated.
  37      */
  38     const char* class_name;
  39
  40     /**
  41      * A pointer to a function which returns the name of a context
  42      * instance \p ctx associated with the class.
  43      */
  44     const char* (*item_name)(void* ctx);
  45
  46     /**
  47      * a pointer to the first option specified in the class if any or NULL
  48      *
  49      * @see av_set_default_options()
  50      */
  51     const struct AVOption *option;
  52 };
  53
  54 /* av_log API */
  55
  56 #if LIBAVUTIL_VERSION_INT < (50<<16)
  57 #define AV_LOG_QUIET -1
  58 #define AV_LOG_FATAL 0
  59 #define AV_LOG_ERROR 0
  60 #define AV_LOG_WARNING 1
  61 #define AV_LOG_INFO 1
  62 #define AV_LOG_VERBOSE 1
  63 #define AV_LOG_DEBUG 2
  64 #else
  65 #define AV_LOG_QUIET    -8
  66
  67 /**
  68  * Something went really wrong and we will crash now.
  69  */
  70 #define AV_LOG_PANIC     0
  71
  72 /**
  73  * Something went wrong and recovery is not possible.
  74  * For example, no header was found for a format which depends
  75  * on headers or an illegal combination of parameters is used.
  76  */
  77 #define AV_LOG_FATAL     8
  78
  79 /**
  80  * Something went wrong and cannot losslessly be recovered.
  81  * However, not all future data is affected.
  82  */
  83 #define AV_LOG_ERROR    16
  84
  85 /**
  86  * Something somehow does not look correct. This may or may not
  87  * lead to problems. An example would be the use of '-vstrict -2'.
  88  */
  89 #define AV_LOG_WARNING  24
  90
  91 #define AV_LOG_INFO     32
  92 #define AV_LOG_VERBOSE  40
  93
  94 /**
  95  * Stuff which is only useful for libav* developers.
  96  */
  97 #define AV_LOG_DEBUG    48
  98 #endif
  99
 100 #if LIBAVUTIL_VERSION_INT < (50<<16)
 101 extern int av_log_level;
 102 #endif
 103
 104 /**
 105  * Sends the specified message to the log if the level is less than or equal
 106  * to the current av_log_level. By default, all logging messages are sent to
 107  * stderr. This behavior can be altered by setting a different av_vlog callback
 108  * function.
 109  *
 110  * @param avcl A pointer to an arbitrary struct of which the first field is a
 111  * pointer to an AVClass struct.
 112  * @param level The importance level of the message, lower values signifying
 113  * higher importance.
 114  * @param fmt The format string (printf-compatible) that specifies how
 115  * subsequent arguments are converted to output.
 116  * @see av_vlog
 117  */
 118 #ifdef __GNUC__
 119 void av_log(void*, int level, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 3, 4)));
 120 #else
 121 void av_log(void*, int level, const char *fmt, ...);
 122 #endif
 123
 124 void av_vlog(void*, int level, const char *fmt, va_list);
 125 int av_log_get_level(void);
 126 void av_log_set_level(int);
 127 void av_log_set_callback(void (*)(void*, int, const char*, va_list));
 128 void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl);
 129
 130 #endif /* AVUTIL_LOG_H */