libavutil/log.c

   1 /*
   2  * log functions
   3  * Copyright (c) 2003 Michel Bardiaux
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file libavutil/log.c
  24  * logging functions
  25  */
  26
  27 #include "avutil.h"
  28 #include "log.h"
  29
  30 int av_log_level = AV_LOG_INFO;
  31
  32 void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
  33 {
  34     static int print_prefix=1;
  35     static int count;
  36     static char line[1024], prev[1024];
  37     AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
  38     if(level>av_log_level)
  39         return;
  40 #undef fprintf
  41     if(print_prefix && avc) {
  42         snprintf(line, sizeof(line), "[%s @ %p]", avc->item_name(ptr), ptr);
  43     }else
  44         line[0]=0;
  45
  46     vsnprintf(line + strlen(line), sizeof(line) - strlen(line), fmt, vl);
  47
  48     print_prefix= line[strlen(line)-1] == '\n';
  49     if(print_prefix && !strcmp(line, prev)){
  50         count++;
  51         return;
  52     }
  53     if(count>0){
  54         fprintf(stderr, "    Last message repeated %d times\n", count);
  55         count=0;
  56     }
  57     fputs(line, stderr);
  58     strcpy(prev, line);
  59 }
  60
  61 static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
  62
  63 void av_log(void* avcl, int level, const char *fmt, ...)
  64 {
  65     va_list vl;
  66     va_start(vl, fmt);
  67     av_vlog(avcl, level, fmt, vl);
  68     va_end(vl);
  69 }
  70
  71 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
  72 {
  73     av_log_callback(avcl, level, fmt, vl);
  74 }
  75
  76 int av_log_get_level(void)
  77 {
  78     return av_log_level;
  79 }
  80
  81 void av_log_set_level(int level)
  82 {
  83     av_log_level = level;
  84 }
  85
  86 void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
  87 {
  88     av_log_callback = callback;
  89 }