Logging Facility

Граф связей класса Logging Facility:

Группы
	Logging Constants

Функции
void	av_log (void *avcl, int level, const char *fmt,...) av_printf_format(3
void void	av_vlog (void *avcl, int level, const char *fmt, va_list vl)
int	av_log_get_level (void)
void	av_log_set_level (int level)
void	av_log_set_callback (void(*callback)(void *, int, const char *, va_list))
void	av_log_default_callback (void *avcl, int level, const char *fmt, va_list vl)
const char *	av_default_item_name (void *ctx)
AVClassCategory	av_default_get_category (void *ptr)
void	av_log_format_line (void *ptr, int level, const char *fmt, va_list vl, char *line, int line_size, int *print_prefix)
int	av_log_format_line2 (void *ptr, int level, const char *fmt, va_list vl, char *line, int line_size, int *print_prefix)
void	av_log_set_flags (int arg)
int	av_log_get_flags (void)

Подробное описание

Функции

av_log()

void av_log	(	void *	avcl,
		int	level,
		const char *	fmt,
			...
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>

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 logging callback function.

См. также

av_log_set_callback

Аргументы

avcl	A pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct or NULL if general log.
level	The importance level of the message expressed using a Logging Constant.
fmt	The format string (printf-compatible) that specifies how subsequent arguments are converted to output.

av_vlog()

void void av_vlog	(	void *	avcl,
		int	level,
		const char *	fmt,
		va_list	vl
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>

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 logging callback function.

См. также

av_log_set_callback

Аргументы

avcl	A pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct.
level	The importance level of the message expressed using a Logging Constant.
fmt	The format string (printf-compatible) that specifies how subsequent arguments are converted to output.
vl	The arguments referenced by the format string.

av_log_get_level()

int av_log_get_level

(

void

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>

Get the current log level

См. также

Logging Constants

Возвращает

Current log level

av_log_set_level()

void av_log_set_level

(

int

level

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>

Set the log level

См. также

Logging Constants

Аргументы

level

Logging level

av_log_set_callback()

void av_log_set_callback

(

void(*)(void *, int, const char *, va_list)

callback

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>

Set the logging callback

Заметки

The callback must be thread safe, even if the application does not use threads itself as some codecs are multithreaded.

См. также

av_log_default_callback

Аргументы

callback

A logging function with a compatible signature.

Используется в MPlayer::MPlayer().

Граф вызова функции:

av_log_default_callback()

void av_log_default_callback	(	void *	avcl,
		int	level,
		const char *	fmt,
		va_list	vl
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>

Default logging callback

It prints the message to stderr, optionally colorizing it.

Аргументы

avcl	A pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct.
level	The importance level of the message expressed using a Logging Constant.
fmt	The format string (printf-compatible) that specifies how subsequent arguments are converted to output.
vl	The arguments referenced by the format string.

av_default_item_name()

const char* av_default_item_name

(

void *

ctx

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>

Return the context name

Аргументы

ctx	The AVClass context

Возвращает

The AVClass class_name

av_default_get_category()

AVClassCategory av_default_get_category

(

void *

ptr

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>

av_log_format_line()

void av_log_format_line	(	void *	ptr,
		int	level,
		const char *	fmt,
		va_list	vl,
		char *	line,
		int	line_size,
		int *	print_prefix
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>

Format a line of log the same way as the default callback.

Аргументы

line	buffer to receive the formatted line
line_size	size of the buffer
print_prefix	used to store whether the prefix must be printed; must point to a persistent integer initially set to 1

Используется в av_logger().

Граф вызова функции:

av_log_format_line2()

int av_log_format_line2	(	void *	ptr,
		int	level,
		const char *	fmt,
		va_list	vl,
		char *	line,
		int	line_size,
		int *	print_prefix
	)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>

Format a line of log the same way as the default callback.

Аргументы

line	buffer to receive the formatted line; may be NULL if line_size is 0
line_size	size of the buffer; at most line_size-1 characters will be written to the buffer, plus one null terminator
print_prefix	used to store whether the prefix must be printed; must point to a persistent integer initially set to 1

Возвращает

Returns a negative value if an error occurred, otherwise returns the number of characters that would have been written for a sufficiently large buffer, not including the terminating null character. If the return value is not less than line_size, it means that the log message was truncated to fit the buffer.

av_log_set_flags()

void av_log_set_flags

(

int

arg

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>

av_log_get_flags()

int av_log_get_flags

(

void

)

#include <C:/git/world-of-might-and-magic/lib/win32/x86/ffmpeg-4.2.2/include/libavutil/log.h>