Code clean-up for crc.c, lfg.c, log.c, random_see.d, rational.c and tree.c.
[libav.git] / 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 <unistd.h>
28 #include <stdlib.h>
29 #include "avstring.h"
30 #include "avutil.h"
31 #include "log.h"
32
33 static int av_log_level = AV_LOG_INFO;
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) +
103 avc->parent_log_context_offset);
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) =
138 av_log_default_callback;
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
157 int av_log_get_level(void)
158 {
159 return av_log_level;
160 }
161
162 void av_log_set_level(int level)
163 {
164 av_log_level = level;
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 }