log.c
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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 
27 #include <unistd.h>
28 #include <stdlib.h>
29 #include "avstring.h"
30 #include "avutil.h"
31 #include "log.h"
32 
34 static int flags;
35 
36 #if defined(_WIN32) && !defined(__MINGW32CE__)
37 #include <windows.h>
38 static const uint8_t color[] = { 12, 12, 12, 14, 7, 7, 7 };
39 static int16_t background, attr_orig;
40 static HANDLE con;
41 #define set_color(x) SetConsoleTextAttribute(con, background | color[x])
42 #define reset_color() SetConsoleTextAttribute(con, attr_orig)
43 #else
44 static const uint8_t color[] = { 0x41, 0x41, 0x11, 0x03, 9, 9, 9 };
45 #define set_color(x) fprintf(stderr, "\033[%d;3%dm", color[x] >> 4, color[x]&15)
46 #define reset_color() fprintf(stderr, "\033[0m")
47 #endif
48 static int use_color = -1;
49 
50 #undef fprintf
51 static void colored_fputs(int level, const char *str)
52 {
53  if (use_color < 0) {
54 #if defined(_WIN32) && !defined(__MINGW32CE__)
55  CONSOLE_SCREEN_BUFFER_INFO con_info;
56  con = GetStdHandle(STD_ERROR_HANDLE);
57  use_color = (con != INVALID_HANDLE_VALUE) && !getenv("NO_COLOR") &&
58  !getenv("AV_LOG_FORCE_NOCOLOR");
59  if (use_color) {
60  GetConsoleScreenBufferInfo(con, &con_info);
61  attr_orig = con_info.wAttributes;
62  background = attr_orig & 0xF0;
63  }
64 #elif HAVE_ISATTY
65  use_color = !getenv("NO_COLOR") && !getenv("AV_LOG_FORCE_NOCOLOR") &&
66  (getenv("TERM") && isatty(2) ||
67  getenv("AV_LOG_FORCE_COLOR"));
68 #else
69  use_color = getenv("AV_LOG_FORCE_COLOR") && !getenv("NO_COLOR") &&
70  !getenv("AV_LOG_FORCE_NOCOLOR");
71 #endif
72  }
73 
74  if (use_color) {
75  set_color(level);
76  }
77  fputs(str, stderr);
78  if (use_color) {
79  reset_color();
80  }
81 }
82 
83 const char *av_default_item_name(void *ptr)
84 {
85  return (*(AVClass **) ptr)->class_name;
86 }
87 
88 void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
89 {
90  static int print_prefix = 1;
91  static int count;
92  static char prev[1024];
93  char line[1024];
94  static int is_atty;
95  AVClass* avc = ptr ? *(AVClass **) ptr : NULL;
96  if (level > av_log_level)
97  return;
98  line[0] = 0;
99 #undef fprintf
100  if (print_prefix && avc) {
101  if (avc->parent_log_context_offset) {
102  AVClass** parent = *(AVClass ***) (((uint8_t *) ptr) +
104  if (parent && *parent) {
105  snprintf(line, sizeof(line), "[%s @ %p] ",
106  (*parent)->item_name(parent), parent);
107  }
108  }
109  snprintf(line + strlen(line), sizeof(line) - strlen(line), "[%s @ %p] ",
110  avc->item_name(ptr), ptr);
111  }
112 
113  vsnprintf(line + strlen(line), sizeof(line) - strlen(line), fmt, vl);
114 
115  print_prefix = strlen(line) && line[strlen(line) - 1] == '\n';
116 
117 #if HAVE_ISATTY
118  if (!is_atty)
119  is_atty = isatty(2) ? 1 : -1;
120 #endif
121 
122  if (print_prefix && (flags & AV_LOG_SKIP_REPEATED) &&
123  !strncmp(line, prev, sizeof line)) {
124  count++;
125  if (is_atty == 1)
126  fprintf(stderr, " Last message repeated %d times\r", count);
127  return;
128  }
129  if (count > 0) {
130  fprintf(stderr, " Last message repeated %d times\n", count);
131  count = 0;
132  }
133  colored_fputs(av_clip(level >> 3, 0, 6), line);
134  av_strlcpy(prev, line, sizeof line);
135 }
136 
137 static void (*av_log_callback)(void*, int, const char*, va_list) =
139 
140 void av_log(void* avcl, int level, const char *fmt, ...)
141 {
142  AVClass* avc = avcl ? *(AVClass **) avcl : NULL;
143  va_list vl;
144  va_start(vl, fmt);
145  if (avc && avc->version >= (50 << 16 | 15 << 8 | 2) &&
146  avc->log_level_offset_offset && level >= AV_LOG_FATAL)
147  level += *(int *) (((uint8_t *) avcl) + avc->log_level_offset_offset);
148  av_vlog(avcl, level, fmt, vl);
149  va_end(vl);
150 }
151 
152 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
153 {
154  av_log_callback(avcl, level, fmt, vl);
155 }
156 
158 {
159  return av_log_level;
160 }
161 
163 {
165 }
166 
167 void av_log_set_flags(int arg)
168 {
169  flags = arg;
170 }
171 
172 void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
173 {
174  av_log_callback = callback;
175 }