1/*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#ifndef AVUTIL_LOG_H
22#define AVUTIL_LOG_H
23
24#include <stdarg.h>
25#include "avutil.h"
26
27/**
28 * Describes the class of an AVClass context structure. That is an
29 * arbitrary struct of which the first field is a pointer to an
30 * AVClass struct (e.g. AVCodecContext, AVFormatContext etc.).
31 */
32typedef struct AVCLASS AVClass;
33struct AVCLASS {
34    /**
35     * The name of the class; usually it is the same name as the
36     * context structure type to which the AVClass is associated.
37     */
38    const char* class_name;
39
40    /**
41     * A pointer to a function which returns the name of a context
42     * instance \p ctx associated with the class.
43     */
44    const char* (*item_name)(void* ctx);
45
46    /**
47     * a pointer to the first option specified in the class if any or NULL
48     *
49     * @see av_set_default_options()
50     */
51    const struct AVOption *option;
52};
53
54/* av_log API */
55
56#if LIBAVUTIL_VERSION_INT < (50<<16)
57#define AV_LOG_QUIET -1
58#define AV_LOG_FATAL 0
59#define AV_LOG_ERROR 0
60#define AV_LOG_WARNING 1
61#define AV_LOG_INFO 1
62#define AV_LOG_VERBOSE 1
63#define AV_LOG_DEBUG 2
64#else
65#define AV_LOG_QUIET    -8
66
67/**
68 * Something went really wrong and we will crash now.
69 */
70#define AV_LOG_PANIC     0
71
72/**
73 * Something went wrong and recovery is not possible.
74 * For example, no header was found for a format which depends
75 * on headers or an illegal combination of parameters is used.
76 */
77#define AV_LOG_FATAL     8
78
79/**
80 * Something went wrong and cannot losslessly be recovered.
81 * However, not all future data is affected.
82 */
83#define AV_LOG_ERROR    16
84
85/**
86 * Something somehow does not look correct. This may or may not
87 * lead to problems. An example would be the use of '-vstrict -2'.
88 */
89#define AV_LOG_WARNING  24
90
91#define AV_LOG_INFO     32
92#define AV_LOG_VERBOSE  40
93
94/**
95 * Stuff which is only useful for libav* developers.
96 */
97#define AV_LOG_DEBUG    48
98#endif
99
100#if LIBAVUTIL_VERSION_INT < (50<<16)
101extern int av_log_level;
102#endif
103
104/**
105 * Sends the specified message to the log if the level is less than or equal
106 * to the current av_log_level. By default, all logging messages are sent to
107 * stderr. This behavior can be altered by setting a different av_vlog callback
108 * function.
109 *
110 * @param avcl A pointer to an arbitrary struct of which the first field is a
111 * pointer to an AVClass struct.
112 * @param level The importance level of the message, lower values signifying
113 * higher importance.
114 * @param fmt The format string (printf-compatible) that specifies how
115 * subsequent arguments are converted to output.
116 * @see av_vlog
117 */
118#ifdef __GNUC__
119void av_log(void*, int level, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 3, 4)));
120#else
121void av_log(void*, int level, const char *fmt, ...);
122#endif
123
124void av_vlog(void*, int level, const char *fmt, va_list);
125int av_log_get_level(void);
126void av_log_set_level(int);
127void av_log_set_callback(void (*)(void*, int, const char*, va_list));
128void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl);
129
130#endif /* AVUTIL_LOG_H */
131