262 lines
7.2 KiB
C
262 lines
7.2 KiB
C
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_LOG_H
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#define AVUTIL_LOG_H
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#include <stdarg.h>
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#include "avutil.h"
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#include "attributes.h"
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/**
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* Describe the class of an AVClass context structure. That is an
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* arbitrary struct of which the first field is a pointer to an
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* AVClass struct (e.g. AVCodecContext, AVFormatContext etc.).
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*/
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typedef struct AVClass {
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/**
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* The name of the class; usually it is the same name as the
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* context structure type to which the AVClass is associated.
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*/
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const char* class_name;
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/**
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* A pointer to a function which returns the name of a context
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* instance ctx associated with the class.
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*/
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const char* (*item_name)(void* ctx);
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/**
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* a pointer to the first option specified in the class if any or NULL
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*
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* @see av_set_default_options()
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*/
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const struct AVOption *option;
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/**
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* LIBAVUTIL_VERSION with which this structure was created.
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* This is used to allow fields to be added without requiring major
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* version bumps everywhere.
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*/
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int version;
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/**
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* Offset in the structure where log_level_offset is stored.
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* 0 means there is no such variable
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*/
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int log_level_offset_offset;
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/**
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* Offset in the structure where a pointer to the parent context for
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* logging is stored. For example a decoder could pass its AVCodecContext
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* to eval as such a parent context, which an av_log() implementation
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* could then leverage to display the parent context.
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* The offset can be NULL.
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*/
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int parent_log_context_offset;
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/**
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* Return next AVOptions-enabled child or NULL
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*/
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void* (*child_next)(void *obj, void *prev);
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/**
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* Return an AVClass corresponding to the next potential
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* AVOptions-enabled child.
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*
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* The difference between child_next and this is that
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* child_next iterates over _already existing_ objects, while
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* child_class_next iterates over _all possible_ children.
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*/
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const struct AVClass* (*child_class_next)(const struct AVClass *prev);
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} AVClass;
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/**
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* @addtogroup lavu_log
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*
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* @{
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*
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* @defgroup lavu_log_constants Logging Constants
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*
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* @{
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*/
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/**
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* Print no output.
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*/
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#define AV_LOG_QUIET -8
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/**
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* Something went really wrong and we will crash now.
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*/
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#define AV_LOG_PANIC 0
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/**
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* Something went wrong and recovery is not possible.
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* For example, no header was found for a format which depends
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* on headers or an illegal combination of parameters is used.
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*/
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#define AV_LOG_FATAL 8
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/**
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* Something went wrong and cannot losslessly be recovered.
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* However, not all future data is affected.
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*/
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#define AV_LOG_ERROR 16
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/**
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* Something somehow does not look correct. This may or may not
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* lead to problems. An example would be the use of '-vstrict -2'.
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*/
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#define AV_LOG_WARNING 24
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/**
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* Standard information.
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*/
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#define AV_LOG_INFO 32
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/**
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* Detailed information.
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*/
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#define AV_LOG_VERBOSE 40
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/**
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* Stuff which is only useful for libav* developers.
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*/
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#define AV_LOG_DEBUG 48
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/**
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* @}
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*/
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/**
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* Send the specified message to the log if the level is less than or equal
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* to the current av_log_level. By default, all logging messages are sent to
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* stderr. This behavior can be altered by setting a different logging callback
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* function.
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* @see av_log_set_callback
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*
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* @param avcl A pointer to an arbitrary struct of which the first field is a
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* pointer to an AVClass struct.
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* @param level The importance level of the message expressed using a @ref
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* lavu_log_constants "Logging Constant".
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* @param fmt The format string (printf-compatible) that specifies how
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* subsequent arguments are converted to output.
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*/
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void av_log(void *avcl, int level, const char *fmt, ...) av_printf_format(3, 4);
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/**
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* Send the specified message to the log if the level is less than or equal
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* to the current av_log_level. By default, all logging messages are sent to
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* stderr. This behavior can be altered by setting a different logging callback
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* function.
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* @see av_log_set_callback
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*
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* @param avcl A pointer to an arbitrary struct of which the first field is a
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* pointer to an AVClass struct.
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* @param level The importance level of the message expressed using a @ref
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* lavu_log_constants "Logging Constant".
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* @param fmt The format string (printf-compatible) that specifies how
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* subsequent arguments are converted to output.
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* @param vl The arguments referenced by the format string.
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*/
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void av_vlog(void *avcl, int level, const char *fmt, va_list vl);
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/**
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* Get the current log level
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*
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* @see lavu_log_constants
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*
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* @return Current log level
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*/
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int av_log_get_level(void);
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/**
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* Set the log level
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*
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* @see lavu_log_constants
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*
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* @param level Logging level
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*/
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void av_log_set_level(int level);
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/**
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* Set the logging callback
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*
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* @see av_log_default_callback
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*
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* @param callback A logging function with a compatible signature.
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*/
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void av_log_set_callback(void (*callback)(void*, int, const char*, va_list));
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/**
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* Default logging callback
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*
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* It prints the message to stderr, optionally colorizing it.
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*
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* @param avcl A pointer to an arbitrary struct of which the first field is a
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* pointer to an AVClass struct.
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* @param level The importance level of the message expressed using a @ref
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* lavu_log_constants "Logging Constant".
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* @param fmt The format string (printf-compatible) that specifies how
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* subsequent arguments are converted to output.
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* @param ap The arguments referenced by the format string.
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*/
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void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl);
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/**
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* Return the context name
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*
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* @param ctx The AVClass context
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*
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* @return The AVClass class_name
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*/
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const char* av_default_item_name(void* ctx);
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/**
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* av_dlog macros
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* Useful to print debug messages that shouldn't get compiled in normally.
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*/
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#ifdef DEBUG
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# define av_dlog(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
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#else
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# define av_dlog(pctx, ...)
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#endif
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/**
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* Skip repeated messages, this requires the user app to use av_log() instead of
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* (f)printf as the 2 would otherwise interfere and lead to
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* "Last message repeated x times" messages below (f)printf messages with some
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* bad luck.
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* Also to receive the last, "last repeated" line if any, the user app must
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* call av_log(NULL, AV_LOG_QUIET, ""); at the end
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*/
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#define AV_LOG_SKIP_REPEATED 1
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void av_log_set_flags(int arg);
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/**
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* @}
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*/
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#endif /* AVUTIL_LOG_H */
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