libavutil/log.c

   1 /*
   2  * log functions
   3  * Copyright (c) 2003 Michel Bardiaux
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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
  24  * logging functions
  25  */
  26
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include "avutil.h"
  30 #include "log.h"
  31
  32 static int av_log_level = AV_LOG_INFO;
  33 static int flags;
  34
  35 #if defined(_WIN32) && !defined(__MINGW32CE__)
  36 #include <windows.h>
  37 static const uint8_t color[] = {12,12,12,14,7,7,7};
  38 static int16_t background, attr_orig;
  39 static HANDLE con;
  40 #define set_color(x)  SetConsoleTextAttribute(con, background | color[x])
  41 #define reset_color() SetConsoleTextAttribute(con, attr_orig)
  42 #else
  43 static const uint8_t color[]={0x41,0x41,0x11,0x03,9,9,9};
  44 #define set_color(x)  fprintf(stderr, "\033[%d;3%dm", color[x]>>4, color[x]&15)
  45 #define reset_color() fprintf(stderr, "\033[0m")
  46 #endif
  47 static int use_color=-1;
  48
  49 #undef fprintf
  50 static void colored_fputs(int level, const char *str){
  51     if(use_color<0){
  52 #if defined(_WIN32) && !defined(__MINGW32CE__)
  53         CONSOLE_SCREEN_BUFFER_INFO con_info;
  54         con = GetStdHandle(STD_ERROR_HANDLE);
  55         use_color = (con != INVALID_HANDLE_VALUE) && !getenv("NO_COLOR") && !getenv("FFMPEG_FORCE_NOCOLOR");
  56         if (use_color) {
  57             GetConsoleScreenBufferInfo(con, &con_info);
  58             attr_orig  = con_info.wAttributes;
  59             background = attr_orig & 0xF0;
  60         }
  61 #elif HAVE_ISATTY
  62         use_color= !getenv("NO_COLOR") && !getenv("FFMPEG_FORCE_NOCOLOR") &&
  63             (getenv("TERM") && isatty(2) || getenv("FFMPEG_FORCE_COLOR"));
  64 #else
  65         use_color= getenv("FFMPEG_FORCE_COLOR") && !getenv("NO_COLOR") && !getenv("FFMPEG_FORCE_NOCOLOR");
  66 #endif
  67     }
  68
  69     if(use_color){
  70         set_color(level);
  71     }
  72     fputs(str, stderr);
  73     if(use_color){
  74         reset_color();
  75     }
  76 }
  77
  78 const char* av_default_item_name(void* ptr){
  79     return (*(AVClass**)ptr)->class_name;
  80 }
  81
  82 void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
  83 {
  84     static int print_prefix=1;
  85     static int count;
  86     static char line[1024], prev[1024];
  87     static int is_atty;
  88     AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
  89     if(level>av_log_level)
  90         return;
  91     line[0]=0;
  92 #undef fprintf
  93     if(print_prefix && avc) {
  94         if (avc->parent_log_context_offset) {
  95             AVClass** parent= *(AVClass***)(((uint8_t*)ptr) + avc->parent_log_context_offset);
  96             if(parent && *parent){
  97                 snprintf(line, sizeof(line), "[%s @ %p] ", (*parent)->item_name(parent), parent);
  98             }
  99         }
 100         snprintf(line + strlen(line), sizeof(line) - strlen(line), "[%s @ %p] ", avc->item_name(ptr), ptr);
 101     }
 102
 103     vsnprintf(line + strlen(line), sizeof(line) - strlen(line), fmt, vl);
 104
 105     print_prefix= line[strlen(line)-1] == '\n';
 106
 107 #if HAVE_ISATTY
 108     if(!is_atty) is_atty= isatty(2) ? 1 : -1;
 109 #endif
 110
 111     if(print_prefix && (flags & AV_LOG_SKIP_REPEATED) && !strcmp(line, prev)){
 112         count++;
 113         if(is_atty==1)
 114             fprintf(stderr, "    Last message repeated %d times\r", count);
 115         return;
 116     }
 117     if(count>0){
 118         fprintf(stderr, "    Last message repeated %d times\n", count);
 119         count=0;
 120     }
 121     colored_fputs(av_clip(level>>3, 0, 6), line);
 122     strcpy(prev, line);
 123 }
 124
 125 static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
 126
 127 void av_log(void* avcl, int level, const char *fmt, ...)
 128 {
 129     AVClass* avc= avcl ? *(AVClass**)avcl : NULL;
 130     va_list vl;
 131     va_start(vl, fmt);
 132     if(avc && avc->version >= (50<<16 | 15<<8 | 2) && avc->log_level_offset_offset && level>=AV_LOG_FATAL)
 133         level += *(int*)(((uint8_t*)avcl) + avc->log_level_offset_offset);
 134     av_vlog(avcl, level, fmt, vl);
 135     va_end(vl);
 136 }
 137
 138 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
 139 {
 140     av_log_callback(avcl, level, fmt, vl);
 141 }
 142
 143 int av_log_get_level(void)
 144 {
 145     return av_log_level;
 146 }
 147
 148 void av_log_set_level(int level)
 149 {
 150     av_log_level = level;
 151 }
 152
 153 void av_log_set_flags(int arg)
 154 {
 155     flags= arg;
 156 }
 157
 158 void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
 159 {
 160     av_log_callback = callback;
 161 }