libavutil/log.c
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00001 /*
00002  * log functions
00003  * Copyright (c) 2003 Michel Bardiaux
00004  *
00005  * This file is part of Libav.
00006  *
00007  * Libav is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * Libav is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with Libav; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #include <unistd.h>
00028 #include <stdlib.h>
00029 #include "avstring.h"
00030 #include "avutil.h"
00031 #include "log.h"
00032 
00033 static int av_log_level = AV_LOG_INFO;
00034 static int flags;
00035 
00036 #if defined(_WIN32) && !defined(__MINGW32CE__)
00037 #include <windows.h>
00038 static const uint8_t color[] = { 12, 12, 12, 14, 7, 7, 7 };
00039 static int16_t background, attr_orig;
00040 static HANDLE con;
00041 #define set_color(x)  SetConsoleTextAttribute(con, background | color[x])
00042 #define reset_color() SetConsoleTextAttribute(con, attr_orig)
00043 #else
00044 static const uint8_t color[] = { 0x41, 0x41, 0x11, 0x03, 9, 9, 9 };
00045 #define set_color(x)  fprintf(stderr, "\033[%d;3%dm", color[x] >> 4, color[x]&15)
00046 #define reset_color() fprintf(stderr, "\033[0m")
00047 #endif
00048 static int use_color = -1;
00049 
00050 #undef fprintf
00051 static void colored_fputs(int level, const char *str)
00052 {
00053     if (use_color < 0) {
00054 #if defined(_WIN32) && !defined(__MINGW32CE__)
00055         CONSOLE_SCREEN_BUFFER_INFO con_info;
00056         con = GetStdHandle(STD_ERROR_HANDLE);
00057         use_color = (con != INVALID_HANDLE_VALUE) && !getenv("NO_COLOR") &&
00058                     !getenv("AV_LOG_FORCE_NOCOLOR");
00059         if (use_color) {
00060             GetConsoleScreenBufferInfo(con, &con_info);
00061             attr_orig  = con_info.wAttributes;
00062             background = attr_orig & 0xF0;
00063         }
00064 #elif HAVE_ISATTY
00065         use_color = !getenv("NO_COLOR") && !getenv("AV_LOG_FORCE_NOCOLOR") &&
00066                     (getenv("TERM") && isatty(2) ||
00067                      getenv("AV_LOG_FORCE_COLOR"));
00068 #else
00069         use_color = getenv("AV_LOG_FORCE_COLOR") && !getenv("NO_COLOR") &&
00070                    !getenv("AV_LOG_FORCE_NOCOLOR");
00071 #endif
00072     }
00073 
00074     if (use_color) {
00075         set_color(level);
00076     }
00077     fputs(str, stderr);
00078     if (use_color) {
00079         reset_color();
00080     }
00081 }
00082 
00083 const char *av_default_item_name(void *ptr)
00084 {
00085     return (*(AVClass **) ptr)->class_name;
00086 }
00087 
00088 void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
00089 {
00090     static int print_prefix = 1;
00091     static int count;
00092     static char prev[1024];
00093     char line[1024];
00094     static int is_atty;
00095     AVClass* avc = ptr ? *(AVClass **) ptr : NULL;
00096     if (level > av_log_level)
00097         return;
00098     line[0] = 0;
00099 #undef fprintf
00100     if (print_prefix && avc) {
00101         if (avc->parent_log_context_offset) {
00102             AVClass** parent = *(AVClass ***) (((uint8_t *) ptr) +
00103                                    avc->parent_log_context_offset);
00104             if (parent && *parent) {
00105                 snprintf(line, sizeof(line), "[%s @ %p] ",
00106                          (*parent)->item_name(parent), parent);
00107             }
00108         }
00109         snprintf(line + strlen(line), sizeof(line) - strlen(line), "[%s @ %p] ",
00110                  avc->item_name(ptr), ptr);
00111     }
00112 
00113     vsnprintf(line + strlen(line), sizeof(line) - strlen(line), fmt, vl);
00114 
00115     print_prefix = strlen(line) && line[strlen(line) - 1] == '\n';
00116 
00117 #if HAVE_ISATTY
00118     if (!is_atty)
00119         is_atty = isatty(2) ? 1 : -1;
00120 #endif
00121 
00122     if (print_prefix && (flags & AV_LOG_SKIP_REPEATED) &&
00123         !strncmp(line, prev, sizeof line)) {
00124         count++;
00125         if (is_atty == 1)
00126             fprintf(stderr, "    Last message repeated %d times\r", count);
00127         return;
00128     }
00129     if (count > 0) {
00130         fprintf(stderr, "    Last message repeated %d times\n", count);
00131         count = 0;
00132     }
00133     colored_fputs(av_clip(level >> 3, 0, 6), line);
00134     av_strlcpy(prev, line, sizeof line);
00135 }
00136 
00137 static void (*av_log_callback)(void*, int, const char*, va_list) =
00138     av_log_default_callback;
00139 
00140 void av_log(void* avcl, int level, const char *fmt, ...)
00141 {
00142     AVClass* avc = avcl ? *(AVClass **) avcl : NULL;
00143     va_list vl;
00144     va_start(vl, fmt);
00145     if (avc && avc->version >= (50 << 16 | 15 << 8 | 2) &&
00146         avc->log_level_offset_offset && level >= AV_LOG_FATAL)
00147         level += *(int *) (((uint8_t *) avcl) + avc->log_level_offset_offset);
00148     av_vlog(avcl, level, fmt, vl);
00149     va_end(vl);
00150 }
00151 
00152 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
00153 {
00154     av_log_callback(avcl, level, fmt, vl);
00155 }
00156 
00157 int av_log_get_level(void)
00158 {
00159     return av_log_level;
00160 }
00161 
00162 void av_log_set_level(int level)
00163 {
00164     av_log_level = level;
00165 }
00166 
00167 void av_log_set_flags(int arg)
00168 {
00169     flags = arg;
00170 }
00171 
00172 void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
00173 {
00174     av_log_callback = callback;
00175 }