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libavutil/log.c

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00001 /*
00002  * log functions
00003  * Copyright (c) 2003 Michel Bardiaux
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 "avutil.h"
00030 #include "log.h"
00031 
00032 static int av_log_level = AV_LOG_INFO;
00033 static int flags;
00034 
00035 #if defined(_WIN32) && !defined(__MINGW32CE__)
00036 #include <windows.h>
00037 static const uint8_t color[] = { 12, 12, 12, 14, 7, 7, 10 };
00038 static int16_t background, attr_orig;
00039 static HANDLE con;
00040 #define set_color(x)  SetConsoleTextAttribute(con, background | color[x])
00041 #define reset_color() SetConsoleTextAttribute(con, attr_orig)
00042 #else
00043 static const uint8_t color[] = { 0x41, 0x41, 0x11, 0x03, 9, 9, 2 };
00044 #define set_color(x)  fprintf(stderr, "\033[%d;3%dm", color[x] >> 4, color[x]&15)
00045 #define reset_color() fprintf(stderr, "\033[0m")
00046 #endif
00047 static int use_color = -1;
00048 
00049 #undef fprintf
00050 static void colored_fputs(int level, const char *str)
00051 {
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") &&
00057                     !getenv("AV_LOG_FORCE_NOCOLOR");
00058         if (use_color) {
00059             GetConsoleScreenBufferInfo(con, &con_info);
00060             attr_orig  = con_info.wAttributes;
00061             background = attr_orig & 0xF0;
00062         }
00063 #elif HAVE_ISATTY
00064         use_color = !getenv("NO_COLOR") && !getenv("AV_LOG_FORCE_NOCOLOR") &&
00065                     (getenv("TERM") && isatty(2) ||
00066                      getenv("AV_LOG_FORCE_COLOR"));
00067 #else
00068         use_color = getenv("AV_LOG_FORCE_COLOR") && !getenv("NO_COLOR") &&
00069                    !getenv("AV_LOG_FORCE_NOCOLOR");
00070 #endif
00071     }
00072 
00073     if (use_color) {
00074         set_color(level);
00075     }
00076     fputs(str, stderr);
00077     if (use_color) {
00078         reset_color();
00079     }
00080 }
00081 
00082 const char *av_default_item_name(void *ptr)
00083 {
00084     return (*(AVClass **) ptr)->class_name;
00085 }
00086 
00087 static void sanitize(uint8_t *line){
00088     while(*line){
00089         if(*line < 0x08 || (*line > 0x0D && *line < 0x20))
00090             *line='?';
00091         line++;
00092     }
00093 }
00094 
00095 void av_log_format_line(void *ptr, int level, const char *fmt, va_list vl,
00096                         char *line, int line_size, int *print_prefix)
00097 {
00098     AVClass* avc = ptr ? *(AVClass **) ptr : NULL;
00099     line[0] = 0;
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, line_size, "[%s @ %p] ",
00106                          (*parent)->item_name(parent), parent);
00107             }
00108         }
00109         snprintf(line + strlen(line), line_size - strlen(line), "[%s @ %p] ",
00110                  avc->item_name(ptr), ptr);
00111     }
00112 
00113     vsnprintf(line + strlen(line), line_size - strlen(line), fmt, vl);
00114 
00115     *print_prefix = strlen(line) && line[strlen(line) - 1] == '\n';
00116 }
00117 
00118 void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
00119 {
00120     static int print_prefix = 1;
00121     static int count;
00122     static char prev[1024];
00123     char line[1024];
00124     static int is_atty;
00125 
00126     if (level > av_log_level)
00127         return;
00128     av_log_format_line(ptr, level, fmt, vl, line, sizeof(line), &print_prefix);
00129 
00130 #if HAVE_ISATTY
00131     if (!is_atty)
00132         is_atty = isatty(2) ? 1 : -1;
00133 #endif
00134 
00135 #undef fprintf
00136     if (print_prefix && (flags & AV_LOG_SKIP_REPEATED) && !strcmp(line, prev)){
00137         count++;
00138         if (is_atty == 1)
00139             fprintf(stderr, "    Last message repeated %d times\r", count);
00140         return;
00141     }
00142     if (count > 0) {
00143         fprintf(stderr, "    Last message repeated %d times\n", count);
00144         count = 0;
00145     }
00146     strcpy(prev, line);
00147     sanitize(line);
00148     colored_fputs(av_clip(level >> 3, 0, 6), line);
00149 }
00150 
00151 static void (*av_log_callback)(void*, int, const char*, va_list) =
00152     av_log_default_callback;
00153 
00154 void av_log(void* avcl, int level, const char *fmt, ...)
00155 {
00156     AVClass* avc = avcl ? *(AVClass **) avcl : NULL;
00157     va_list vl;
00158     va_start(vl, fmt);
00159     if (avc && avc->version >= (50 << 16 | 15 << 8 | 2) &&
00160         avc->log_level_offset_offset && level >= AV_LOG_FATAL)
00161         level += *(int *) (((uint8_t *) avcl) + avc->log_level_offset_offset);
00162     av_vlog(avcl, level, fmt, vl);
00163     va_end(vl);
00164 }
00165 
00166 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
00167 {
00168     av_log_callback(avcl, level, fmt, vl);
00169 }
00170 
00171 int av_log_get_level(void)
00172 {
00173     return av_log_level;
00174 }
00175 
00176 void av_log_set_level(int level)
00177 {
00178     av_log_level = level;
00179 }
00180 
00181 void av_log_set_flags(int arg)
00182 {
00183     flags = arg;
00184 }
00185 
00186 void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
00187 {
00188     av_log_callback = callback;
00189 }
Generated on Fri Feb 1 2013 14:34:56 for FFmpeg by doxygen 1.7.1