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Logging Facility
Common utility functions

Modules

  Logging Constants
 

Macros

#define  AV_LOG_C(x)   ((x) << 8)
  Sets additional colors for extended debugging sessions.
 
#define  av_dlog(pctx,...)   do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
  av_dlog macros Useful to print debug messages that shouldn't get compiled in normally.
 
#define  AV_LOG_SKIP_REPEATED   1
  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.
 
#define  AV_LOG_PRINT_LEVEL   2
  Include the log severity in messages originating from codecs.
 

Functions

void  av_log (void *avcl, int level, const char *fmt,...) av_printf_format(3
  Send the specified message to the log if the level is less than or equal to the current av_log_level.
 
void 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.
 
int  av_log_get_level (void)
  Get the current log level.
 
void  av_log_set_level (int level)
  Set the log level.
 
void  av_log_set_callback (void(*callback)(void *, int, const char *, va_list))
  Set the logging callback.
 
void  av_log_default_callback (void *avcl, int level, const char *fmt, va_list vl)
  Default logging callback.
 
const char *  av_default_item_name (void *ctx)
  Return the context name.
 
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)
  Format a line of log the same way as the default callback.
 
void  av_log_set_flags (int arg)
 
int  av_log_get_flags (void)
 

Detailed Description

Macro Definition Documentation

#define AV_LOG_C (   x )    ((x) << 8)

Sets additional colors for extended debugging sessions.

av_log(ctx, AV_LOG_DEBUG|AV_LOG_C(134), "Message in purple\n");

Requires 256color terminal support. Uses outside debugging is not recommended.

Definition at line 212 of file log.h.

#define av_dlog (   pctx,
  ... 
)    do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)

av_dlog macros Useful to print debug messages that shouldn't get compiled in normally.

Definition at line 322 of file log.h.

#define AV_LOG_SKIP_REPEATED   1

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

Definition at line 333 of file log.h.

Referenced by av_log_default_callback(), main(), and opt_loglevel().

#define AV_LOG_PRINT_LEVEL   2

Include the log severity in messages originating from codecs.

Results in messages such as: [rawvideo @ 0xDEADBEEF] [error] encode did not produce valid pts

Definition at line 341 of file log.h.

Referenced by format_line().

Function Documentation

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

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.

See Also
av_log_set_callback
Parameters
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.
void 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.

By default, all logging messages are sent to stderr. This behavior can be altered by setting a different logging callback function.

See Also
av_log_set_callback
Parameters
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.

Definition at line 356 of file log.c.

Referenced by ass_log(), av_log(), av_log_ask_for_sample(), missing_feature_sample(), rtmp_log(), vreport_config_error(), vs2av_log(), X264_log(), and XAVS_log().

int av_log_get_level ( void  )

Get the current log level.

See Also
Logging Constants
Returns
Current log level

Definition at line 363 of file log.c.

Referenced by avcodec_string(), check_keyboard_interaction(), filter_frame(), hex_log(), http_av_log(), init(), print_report(), and rtmp_open().

void av_log_set_level ( int  level )

Set the log level.

See Also
Logging Constants
Parameters
level Logging level

Definition at line 368 of file log.c.

Referenced by check_keyboard_interaction(), main(), opt_default(), and opt_loglevel().

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

Set the logging callback.

Note
The callback must be thread safe, even if the application does not use threads itself as some codecs are multithreaded.
See Also
av_log_default_callback
Parameters
callback A logging function with a compatible signature.

Definition at line 383 of file log.c.

Referenced by init_report(), main(), show_buildconf(), show_help(), show_help_default(), and show_version().

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

Default logging callback.

It prints the message to stderr, optionally colorizing it.

Parameters
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.

Definition at line 284 of file log.c.

Referenced by log_callback_report().

const char* av_default_item_name ( void *  ctx )

Return the context name.

Parameters
ctx The AVClass context
Returns
The AVClass class_name

Definition at line 184 of file log.c.

AVClassCategory av_default_get_category ( void *  ptr )

Definition at line 189 of file log.c.

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

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

Parameters
line buffer to receive the formated 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

Definition at line 275 of file log.c.

Referenced by log_callback_report().

void av_log_set_flags ( int  arg )

Definition at line 373 of file log.c.

Referenced by main(), and opt_loglevel().

int av_log_get_flags ( void  )

Definition at line 378 of file log.c.

Referenced by opt_loglevel().

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