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 FFMPEG_LOG_H
  22 #define FFMPEG_LOG_H
  23
  24 #include <stdarg.h>
  25
  26 /**
  27  * Used by av_log
  28  */
  29 typedef struct AVCLASS AVClass;
  30 struct AVCLASS {
  31     const char* class_name;
  32     const char* (*item_name)(void*); /* actually passing a pointer to an AVCodecContext
  33                                         or AVFormatContext, which begin with an AVClass.
  34                                         Needed because av_log is in libavcodec and has no visibility
  35                                         of AVIn/OutputFormat */
  36     const struct AVOption *option;
  37 };
  38
  39 /* av_log API */
  40
  41 #if LIBAVUTIL_VERSION_INT < (50<<16)
  42 #define AV_LOG_QUIET -1
  43 #define AV_LOG_FATAL 0
  44 #define AV_LOG_ERROR 0
  45 #define AV_LOG_WARNING 1
  46 #define AV_LOG_INFO 1
  47 #define AV_LOG_VERBOSE 1
  48 #define AV_LOG_DEBUG 2
  49 #else
  50 #define AV_LOG_QUIET    -8
  51
  52 /**
  53  * something went really wrong and we will crash now
  54  */
  55 #define AV_LOG_PANIC     0
  56
  57 /**
  58  * something went wrong and recovery is not possible
  59  * like no header in a format which depends on it or a combination
  60  * of parameters which are not allowed
  61  */
  62 #define AV_LOG_FATAL     8
  63
  64 /**
  65  * something went wrong and cannot losslessly be recovered
  66  * but not all future data is affected
  67  */
  68 #define AV_LOG_ERROR    16
  69
  70 /**
  71  * something somehow does not look correct / something which may or may not
  72  * lead to some problems like use of -vstrict -2
  73  */
  74 #define AV_LOG_WARNING  24
  75
  76 #define AV_LOG_INFO     32
  77 #define AV_LOG_VERBOSE  40
  78
  79 /**
  80  * stuff which is only useful for libav* developers
  81  */
  82 #define AV_LOG_DEBUG    48
  83 #endif
  84
  85 #if LIBAVUTIL_VERSION_INT < (50<<16)
  86 extern int av_log_level;
  87 #endif
  88
  89 /**
  90  * Send the specified message to the log if the level is less than or equal to
  91  * 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 extern void av_log(void*, int level, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 3, 4)));
 105 #else
 106 extern void av_log(void*, int level, const char *fmt, ...);
 107 #endif
 108
 109 extern void av_vlog(void*, int level, const char *fmt, va_list);
 110 extern int av_log_get_level(void);
 111 extern void av_log_set_level(int);
 112 extern void av_log_set_callback(void (*)(void*, int, const char*, va_list));
 113 extern void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl);
 114
 115 #endif /* FFMPEG_LOG_H */