Libav
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 "config.h"
28 
29 #if HAVE_UNISTD_H
30 #include <unistd.h>
31 #endif
32 #if HAVE_IO_H
33 #include <io.h>
34 #endif
35 #include <stdarg.h>
36 #include <stdlib.h>
37 #include "avstring.h"
38 #include "avutil.h"
39 #include "common.h"
40 #include "internal.h"
41 #include "log.h"
42 
44 static int flags;
45 
46 #if HAVE_SETCONSOLETEXTATTRIBUTE
47 #include <windows.h>
48 static const uint8_t color[] = { 12, 12, 12, 14, 7, 10, 11 };
49 static int16_t background, attr_orig;
50 static HANDLE con;
51 #define set_color(x) SetConsoleTextAttribute(con, background | color[x])
52 #define reset_color() SetConsoleTextAttribute(con, attr_orig)
53 #else
54 static const uint8_t color[] = { 0x41, 0x41, 0x11, 0x03, 9, 0x02, 0x06 };
55 #define set_color(x) fprintf(stderr, "\033[%d;3%dm", color[x] >> 4, color[x]&15)
56 #define reset_color() fprintf(stderr, "\033[0m")
57 #endif
58 static int use_color = -1;
59 
60 static void colored_fputs(int level, const char *str)
61 {
62  if (use_color < 0) {
63 #if HAVE_SETCONSOLETEXTATTRIBUTE
64  CONSOLE_SCREEN_BUFFER_INFO con_info;
65  con = GetStdHandle(STD_ERROR_HANDLE);
66  use_color = (con != INVALID_HANDLE_VALUE) && !getenv("NO_COLOR") &&
67  !getenv("AV_LOG_FORCE_NOCOLOR");
68  if (use_color) {
69  GetConsoleScreenBufferInfo(con, &con_info);
70  attr_orig = con_info.wAttributes;
71  background = attr_orig & 0xF0;
72  }
73 #elif HAVE_ISATTY
74  use_color = !getenv("NO_COLOR") && !getenv("AV_LOG_FORCE_NOCOLOR") &&
75  (getenv("TERM") && isatty(2) ||
76  getenv("AV_LOG_FORCE_COLOR"));
77 #else
78  use_color = getenv("AV_LOG_FORCE_COLOR") && !getenv("NO_COLOR") &&
79  !getenv("AV_LOG_FORCE_NOCOLOR");
80 #endif
81  }
82 
83  if (use_color) {
84  set_color(level);
85  }
86  fputs(str, stderr);
87  if (use_color) {
88  reset_color();
89  }
90 }
91 
92 const char *av_default_item_name(void *ptr)
93 {
94  return (*(AVClass **) ptr)->class_name;
95 }
96 
97 void av_log_default_callback(void *avcl, int level, const char *fmt, va_list vl)
98 {
99  static int print_prefix = 1;
100  static int count;
101  static char prev[1024];
102  char line[1024];
103  static int is_atty;
104  AVClass* avc = avcl ? *(AVClass **) avcl : NULL;
105  if (level > av_log_level)
106  return;
107  line[0] = 0;
108  if (print_prefix && avc) {
109  if (avc->parent_log_context_offset) {
110  AVClass** parent = *(AVClass ***) (((uint8_t *) avcl) +
112  if (parent && *parent) {
113  snprintf(line, sizeof(line), "[%s @ %p] ",
114  (*parent)->item_name(parent), parent);
115  }
116  }
117  snprintf(line + strlen(line), sizeof(line) - strlen(line), "[%s @ %p] ",
118  avc->item_name(avcl), avcl);
119  }
120 
121  vsnprintf(line + strlen(line), sizeof(line) - strlen(line), fmt, vl);
122 
123  print_prefix = strlen(line) && line[strlen(line) - 1] == '\n';
124 
125 #if HAVE_ISATTY
126  if (!is_atty)
127  is_atty = isatty(2) ? 1 : -1;
128 #endif
129 
130  if (print_prefix && (flags & AV_LOG_SKIP_REPEATED) &&
131  !strncmp(line, prev, sizeof line)) {
132  count++;
133  if (is_atty == 1)
134  fprintf(stderr, " Last message repeated %d times\r", count);
135  return;
136  }
137  if (count > 0) {
138  fprintf(stderr, " Last message repeated %d times\n", count);
139  count = 0;
140  }
141  colored_fputs(av_clip(level >> 3, 0, 6), line);
142  av_strlcpy(prev, line, sizeof line);
143 }
144 
145 static void (*av_log_callback)(void*, int, const char*, va_list) =
147 
148 void av_log(void* avcl, int level, const char *fmt, ...)
149 {
150  AVClass* avc = avcl ? *(AVClass **) avcl : NULL;
151  va_list vl;
152  va_start(vl, fmt);
153  if (avc && avc->version >= (50 << 16 | 15 << 8 | 2) &&
154  avc->log_level_offset_offset && level >= AV_LOG_FATAL)
155  level += *(int *) (((uint8_t *) avcl) + avc->log_level_offset_offset);
156  av_vlog(avcl, level, fmt, vl);
157  va_end(vl);
158 }
159 
160 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
161 {
162  av_log_callback(avcl, level, fmt, vl);
163 }
164 
166 {
167  return av_log_level;
168 }
169 
171 {
173 }
174 
175 void av_log_set_flags(int arg)
176 {
177  flags = arg;
178 }
179 
180 void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
181 {
182  av_log_callback = callback;
183 }
184 
185 static void missing_feature_sample(int sample, void *avc, const char *msg,
186  va_list argument_list)
187 {
188  av_vlog(avc, AV_LOG_WARNING, msg, argument_list);
189  av_log(avc, AV_LOG_WARNING, " is not implemented. Update your Libav "
190  "version to the newest one from Git. If the problem still "
191  "occurs, it means that your file has a feature which has not "
192  "been implemented.\n");
193  if (sample)
194  av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
195  "of this file to ftp://upload.libav.org/incoming/ "
196  "and contact the libav-devel mailing list.\n");
197 }
198 
199 void avpriv_request_sample(void *avc, const char *msg, ...)
200 {
201  va_list argument_list;
202 
203  va_start(argument_list, msg);
204  missing_feature_sample(1, avc, msg, argument_list);
205  va_end(argument_list);
206 }
207 
208 void avpriv_report_missing_feature(void *avc, const char *msg, ...)
209 {
210  va_list argument_list;
211 
212  va_start(argument_list, msg);
213  missing_feature_sample(0, avc, msg, argument_list);
214  va_end(argument_list);
215 }
#define set_color(x)
Definition: log.c:55
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:129
void av_log_set_level(int level)
Set the log level.
Definition: log.c:170
#define reset_color()
Definition: log.c:56
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:92
external API header
#define sample
static void missing_feature_sample(int sample, void *avc, const char *msg, va_list argument_list)
Definition: log.c:185
uint8_t
int log_level_offset_offset
Offset in the structure where log_level_offset is stored.
Definition: log.h:65
static int flags
Definition: log.c:44
Definition: graph2dot.c:49
#define AV_LOG_SKIP_REPEATED
Skip repeated messages, this requires the user app to use av_log() instead of (f)printf as the 2 woul...
Definition: log.h:255
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
int av_log_get_level(void)
Get the current log level.
Definition: log.c:165
static int av_log_level
Definition: log.c:43
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:81
void av_log_default_callback(void *avcl, int level, const char *fmt, va_list vl)
Default logging callback.
Definition: log.c:97
common internal API header
void avpriv_report_missing_feature(void *avc, const char *msg,...)
Definition: log.c:208
void av_log_set_callback(void(*callback)(void *, int, const char *, va_list))
Set the logging callback.
Definition: log.c:180
static void(* av_log_callback)(void *, int, const char *, va_list)
Definition: log.c:145
const char *(* item_name)(void *ctx)
A pointer to a function which returns the name of a context instance ctx associated with the class...
Definition: log.h:44
static void colored_fputs(int level, const char *str)
Definition: log.c:60
NULL
Definition: eval.c:55
#define AV_LOG_INFO
Standard information.
Definition: log.h:134
static void(WINAPI *cond_broadcast)(pthread_cond_t *cond)
Describe the class of an AVClass context structure.
Definition: log.h:33
void av_vlog(void *avcl, int level, const char *fmt, va_list vl)
Send the specified message to the log if the level is less than or equal to the current av_log_level...
Definition: log.c:160
uint8_t level
Definition: svq3.c:143
int version
LIBAVUTIL_VERSION with which this structure was created.
Definition: log.h:59
common internal and external API header
int parent_log_context_offset
Offset in the structure where a pointer to the parent context for logging is stored.
Definition: log.h:74
static const uint8_t color[]
Definition: log.c:54
static int use_color
Definition: log.c:58
void avpriv_request_sample(void *avc, const char *msg,...)
Definition: log.c:199
void av_log_set_flags(int arg)
Definition: log.c:175
#define AV_LOG_FATAL
Something went wrong and recovery is not possible.
Definition: log.h:117