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 "config.h"
  28
  29 #if HAVE_UNISTD_H
  30 #include <unistd.h>
  31 #endif
  32 #if HAVE_IO_H
  33 #include <io.h>
  34 #endif
  35 #include <stdlib.h>
  36 #include "avstring.h"
  37 #include "avutil.h"
  38 #include "common.h"
  39 #include "log.h"
  40
  41 static int av_log_level = AV_LOG_INFO;
  42 static int flags;
  43
  44 #if HAVE_SETCONSOLETEXTATTRIBUTE
  45 #include <windows.h>
  46 static const uint8_t color[] = { 12, 12, 12, 14, 7, 10, 11 };
  47 static int16_t background, attr_orig;
  48 static HANDLE con;
  49 #define set_color(x)  SetConsoleTextAttribute(con, background | color[x])
  50 #define reset_color() SetConsoleTextAttribute(con, attr_orig)
  51 #else
  52 static const uint8_t color[] = { 0x41, 0x41, 0x11, 0x03, 9, 0x02, 0x06 };
  53 #define set_color(x)  fprintf(stderr, "\033[%d;3%dm", color[x] >> 4, color[x]&15)
  54 #define reset_color() fprintf(stderr, "\033[0m")
  55 #endif
  56 static int use_color = -1;
  57
  58 static void colored_fputs(int level, const char *str)
  59 {
  60     if (use_color < 0) {
  61 #if HAVE_SETCONSOLETEXTATTRIBUTE
  62         CONSOLE_SCREEN_BUFFER_INFO con_info;
  63         con = GetStdHandle(STD_ERROR_HANDLE);
  64         use_color = (con != INVALID_HANDLE_VALUE) && !getenv("NO_COLOR") &&
  65                     !getenv("AV_LOG_FORCE_NOCOLOR");
  66         if (use_color) {
  67             GetConsoleScreenBufferInfo(con, &con_info);
  68             attr_orig  = con_info.wAttributes;
  69             background = attr_orig & 0xF0;
  70         }
  71 #elif HAVE_ISATTY
  72         use_color = !getenv("NO_COLOR") && !getenv("AV_LOG_FORCE_NOCOLOR") &&
  73                     (getenv("TERM") && isatty(2) ||
  74                      getenv("AV_LOG_FORCE_COLOR"));
  75 #else
  76         use_color = getenv("AV_LOG_FORCE_COLOR") && !getenv("NO_COLOR") &&
  77                    !getenv("AV_LOG_FORCE_NOCOLOR");
  78 #endif
  79     }
  80
  81     if (use_color) {
  82         set_color(level);
  83     }
  84     fputs(str, stderr);
  85     if (use_color) {
  86         reset_color();
  87     }
  88 }
  89
  90 const char *av_default_item_name(void *ptr)
  91 {
  92     return (*(AVClass **) ptr)->class_name;
  93 }
  94
  95 void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
  96 {
  97     static int print_prefix = 1;
  98     static int count;
  99     static char prev[1024];
 100     char line[1024];
 101     static int is_atty;
 102     AVClass* avc = ptr ? *(AVClass **) ptr : NULL;
 103     if (level > av_log_level)
 104         return;
 105     line[0] = 0;
 106     if (print_prefix && avc) {
 107         if (avc->parent_log_context_offset) {
 108             AVClass** parent = *(AVClass ***) (((uint8_t *) ptr) +
 109                                    avc->parent_log_context_offset);
 110             if (parent && *parent) {
 111                 snprintf(line, sizeof(line), "[%s @ %p] ",
 112                          (*parent)->item_name(parent), parent);
 113             }
 114         }
 115         snprintf(line + strlen(line), sizeof(line) - strlen(line), "[%s @ %p] ",
 116                  avc->item_name(ptr), ptr);
 117     }
 118
 119     vsnprintf(line + strlen(line), sizeof(line) - strlen(line), fmt, vl);
 120
 121     print_prefix = strlen(line) && line[strlen(line) - 1] == '\n';
 122
 123 #if HAVE_ISATTY
 124     if (!is_atty)
 125         is_atty = isatty(2) ? 1 : -1;
 126 #endif
 127
 128     if (print_prefix && (flags & AV_LOG_SKIP_REPEATED) &&
 129         !strncmp(line, prev, sizeof line)) {
 130         count++;
 131         if (is_atty == 1)
 132             fprintf(stderr, "    Last message repeated %d times\r", count);
 133         return;
 134     }
 135     if (count > 0) {
 136         fprintf(stderr, "    Last message repeated %d times\n", count);
 137         count = 0;
 138     }
 139     colored_fputs(av_clip(level >> 3, 0, 6), line);
 140     av_strlcpy(prev, line, sizeof line);
 141 }
 142
 143 static void (*av_log_callback)(void*, int, const char*, va_list) =
 144     av_log_default_callback;
 145
 146 void av_log(void* avcl, int level, const char *fmt, ...)
 147 {
 148     AVClass* avc = avcl ? *(AVClass **) avcl : NULL;
 149     va_list vl;
 150     va_start(vl, fmt);
 151     if (avc && avc->version >= (50 << 16 | 15 << 8 | 2) &&
 152         avc->log_level_offset_offset && level >= AV_LOG_FATAL)
 153         level += *(int *) (((uint8_t *) avcl) + avc->log_level_offset_offset);
 154     av_vlog(avcl, level, fmt, vl);
 155     va_end(vl);
 156 }
 157
 158 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
 159 {
 160     av_log_callback(avcl, level, fmt, vl);
 161 }
 162
 163 int av_log_get_level(void)
 164 {
 165     return av_log_level;
 166 }
 167
 168 void av_log_set_level(int level)
 169 {
 170     av_log_level = level;
 171 }
 172
 173 void av_log_set_flags(int arg)
 174 {
 175     flags = arg;
 176 }
 177
 178 void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
 179 {
 180     av_log_callback = callback;
 181 }