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* copyright (c) 2006 Michael Niedermayer <>
* This file is part of FFmpeg.
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#ifndef AVUTIL_LOG_H
#define AVUTIL_LOG_H
#include <stdarg.h>
#include "avutil.h"
#include "attributes.h"
typedef enum {
AV_CLASS_CATEGORY_NB, ///< not part of ABI/API
* Describe the class of an AVClass context structure. That is an
* arbitrary struct of which the first field is a pointer to an
* AVClass struct (e.g. AVCodecContext, AVFormatContext etc.).
typedef struct AVClass {
* The name of the class; usually it is the same name as the
* context structure type to which the AVClass is associated.
const char* class_name;
* A pointer to a function which returns the name of a context
* instance ctx associated with the class.
const char* (*item_name)(void* ctx);
* a pointer to the first option specified in the class if any or NULL
* @see av_set_default_options()
const struct AVOption *option;
* LIBAVUTIL_VERSION with which this structure was created.
* This is used to allow fields to be added without requiring major
* version bumps everywhere.
int version;
* Offset in the structure where log_level_offset is stored.
* 0 means there is no such variable
int log_level_offset_offset;
* Offset in the structure where a pointer to the parent context for loging is stored.
* for example a decoder that uses eval.c could pass its AVCodecContext to eval as such
* parent context. And a av_log() implementation could then display the parent context
* can be NULL of course
int parent_log_context_offset;
* Return next AVOptions-enabled child or NULL
void* (*child_next)(void *obj, void *prev);
* Return an AVClass corresponding to next potential
* AVOptions-enabled child.
* The difference between child_next and this is that
* child_next iterates over _already existing_ objects, while
* child_class_next iterates over _all possible_ children.
const struct AVClass* (*child_class_next)(const struct AVClass *prev);
* Category used for visualization (like color)
* This is only set if the category is equal for all objects using this class.
* available since version (51 << 16 | 56 << 8 | 100)
AVClassCategory category;
* Callback to return the category.
* available since version (51 << 16 | 59 << 8 | 100)
AVClassCategory (*get_category)(void* ctx);
} AVClass;
/* av_log API */
#define AV_LOG_QUIET -8
* Something went really wrong and we will crash now.
#define AV_LOG_PANIC 0
* Something went wrong and recovery is not possible.
* For example, no header was found for a format which depends
* on headers or an illegal combination of parameters is used.
#define AV_LOG_FATAL 8
* Something went wrong and cannot losslessly be recovered.
* However, not all future data is affected.
#define AV_LOG_ERROR 16
* Something somehow does not look correct. This may or may not
* lead to problems. An example would be the use of '-vstrict -2'.
#define AV_LOG_WARNING 24
#define AV_LOG_INFO 32
#define AV_LOG_VERBOSE 40
* Stuff which is only useful for libav* developers.
#define AV_LOG_DEBUG 48
* Send the specified message to the log if the level is less than or equal
* to the current av_log_level. By default, all logging messages are sent to
* stderr. This behavior can be altered by setting a different av_vlog callback
* function.
* @param avcl A pointer to an arbitrary struct of which the first field is a
* pointer to an AVClass struct.
* @param level The importance level of the message, lower values signifying
* higher importance.
* @param fmt The format string (printf-compatible) that specifies how
* subsequent arguments are converted to output.
* @see av_vlog
void av_log(void *avcl, int level, const char *fmt, ...) av_printf_format(3, 4);
void av_vlog(void *avcl, int level, const char *fmt, va_list);
int av_log_get_level(void);
void av_log_set_level(int);
void av_log_set_callback(void (*)(void*, int, const char*, va_list));
void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl);
const char* av_default_item_name(void* ctx);
AVClassCategory av_default_get_category(void *ptr);
* Format a line of log the same way as the default callback.
* @param line buffer to receive the formated line
* @param line_size size of the buffer
* @param print_prefix used to store whether the prefix must be printed;
* must point to a persistent integer initially set to 1
void av_log_format_line(void *ptr, int level, const char *fmt, va_list vl,
char *line, int line_size, int *print_prefix);
* av_dlog macros
* Useful to print debug messages that shouldn't get compiled in normally.
#ifdef DEBUG
# define av_dlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
# define av_dlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
* Skip repeated messages, this requires the user app to use av_log() instead of
* (f)printf as the 2 would otherwise interfere and lead to
* "Last message repeated x times" messages below (f)printf messages with some
* bad luck.
* Also to receive the last, "last repeated" line if any, the user app must
* call av_log(NULL, AV_LOG_QUIET, "%s", ""); at the end
void av_log_set_flags(int arg);
#endif /* AVUTIL_LOG_H */
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