Libav 0.7.1
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     if(use_color<0){
00053 #if defined(_WIN32) && !defined(__MINGW32CE__)
00054         CONSOLE_SCREEN_BUFFER_INFO con_info;
00055         con = GetStdHandle(STD_ERROR_HANDLE);
00056         use_color = (con != INVALID_HANDLE_VALUE) && !getenv("NO_COLOR") && !getenv("FFMPEG_FORCE_NOCOLOR");
00057         if (use_color) {
00058             GetConsoleScreenBufferInfo(con, &con_info);
00059             attr_orig  = con_info.wAttributes;
00060             background = attr_orig & 0xF0;
00061         }
00062 #elif HAVE_ISATTY
00063         use_color= !getenv("NO_COLOR") && !getenv("FFMPEG_FORCE_NOCOLOR") &&
00064             (getenv("TERM") && isatty(2) || getenv("FFMPEG_FORCE_COLOR"));
00065 #else
00066         use_color= getenv("FFMPEG_FORCE_COLOR") && !getenv("NO_COLOR") && !getenv("FFMPEG_FORCE_NOCOLOR");
00067 #endif
00068     }
00069 
00070     if(use_color){
00071         set_color(level);
00072     }
00073     fputs(str, stderr);
00074     if(use_color){
00075         reset_color();
00076     }
00077 }
00078 
00079 const char* av_default_item_name(void* ptr){
00080     return (*(AVClass**)ptr)->class_name;
00081 }
00082 
00083 void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
00084 {
00085     static int print_prefix=1;
00086     static int count;
00087     static char prev[1024];
00088     char line[1024];
00089     static int is_atty;
00090     AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
00091     if(level>av_log_level)
00092         return;
00093     line[0]=0;
00094 #undef fprintf
00095     if(print_prefix && avc) {
00096         if (avc->parent_log_context_offset) {
00097             AVClass** parent= *(AVClass***)(((uint8_t*)ptr) + avc->parent_log_context_offset);
00098             if(parent && *parent){
00099                 snprintf(line, sizeof(line), "[%s @ %p] ", (*parent)->item_name(parent), parent);
00100             }
00101         }
00102         snprintf(line + strlen(line), sizeof(line) - strlen(line), "[%s @ %p] ", avc->item_name(ptr), ptr);
00103     }
00104 
00105     vsnprintf(line + strlen(line), sizeof(line) - strlen(line), fmt, vl);
00106 
00107     print_prefix = strlen(line) && line[strlen(line)-1] == '\n';
00108 
00109 #if HAVE_ISATTY
00110     if(!is_atty) is_atty= isatty(2) ? 1 : -1;
00111 #endif
00112 
00113     if(print_prefix && (flags & AV_LOG_SKIP_REPEATED) && !strncmp(line, prev, sizeof line)){
00114         count++;
00115         if(is_atty==1)
00116             fprintf(stderr, "    Last message repeated %d times\r", count);
00117         return;
00118     }
00119     if(count>0){
00120         fprintf(stderr, "    Last message repeated %d times\n", count);
00121         count=0;
00122     }
00123     colored_fputs(av_clip(level>>3, 0, 6), line);
00124     av_strlcpy(prev, line, sizeof line);
00125 }
00126 
00127 static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
00128 
00129 void av_log(void* avcl, int level, const char *fmt, ...)
00130 {
00131     AVClass* avc= avcl ? *(AVClass**)avcl : NULL;
00132     va_list vl;
00133     va_start(vl, fmt);
00134     if(avc && avc->version >= (50<<16 | 15<<8 | 2) && avc->log_level_offset_offset && level>=AV_LOG_FATAL)
00135         level += *(int*)(((uint8_t*)avcl) + avc->log_level_offset_offset);
00136     av_vlog(avcl, level, fmt, vl);
00137     va_end(vl);
00138 }
00139 
00140 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
00141 {
00142     av_log_callback(avcl, level, fmt, vl);
00143 }
00144 
00145 int av_log_get_level(void)
00146 {
00147     return av_log_level;
00148 }
00149 
00150 void av_log_set_level(int level)
00151 {
00152     av_log_level = level;
00153 }
00154 
00155 void av_log_set_flags(int arg)
00156 {
00157     flags= arg;
00158 }
00159 
00160 void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
00161 {
00162     av_log_callback = callback;
00163 }