avoid an unpredictable branch
[libav.git] / libavutil / log.c
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1/*
2 * log functions
3 * Copyright (c) 2003 Michel Bardiaux
4 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
4b45de0e 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
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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
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
bad5537e 23 * @file libavutil/log.c
7d685b48 24 * logging functions
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25 */
26
27#include "avutil.h"
77652a6a 28#include "log.h"
4b45de0e 29
918a4591 30int av_log_level = AV_LOG_INFO;
4b45de0e 31
411983c1 32void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
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33{
34 static int print_prefix=1;
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35 static int count;
36 static char line[1024], prev[1024];
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37 AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
38 if(level>av_log_level)
39 return;
40#undef fprintf
41 if(print_prefix && avc) {
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42 snprintf(line, sizeof(line), "[%s @ %p]", avc->item_name(ptr), ptr);
43 }else
44 line[0]=0;
4b45de0e 45
b9c353ff 46 vsnprintf(line + strlen(line), sizeof(line) - strlen(line), fmt, vl);
4b45de0e 47
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48 print_prefix= line[strlen(line)-1] == '\n';
49 if(print_prefix && !strcmp(line, prev)){
50 count++;
51 return;
52 }
53 if(count>0){
54 fprintf(stderr, " Last message repeated %d times\n", count);
55 count=0;
56 }
57 fputs(line, stderr);
58 strcpy(prev, line);
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59}
60
61static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
62
63void av_log(void* avcl, int level, const char *fmt, ...)
64{
65 va_list vl;
66 va_start(vl, fmt);
67 av_vlog(avcl, level, fmt, vl);
68 va_end(vl);
69}
70
71void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
72{
73 av_log_callback(avcl, level, fmt, vl);
74}
75
76int av_log_get_level(void)
77{
78 return av_log_level;
79}
80
81void av_log_set_level(int level)
82{
83 av_log_level = level;
84}
85
86void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
87{
88 av_log_callback = callback;
89}