/* * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> * * 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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * 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" /** * 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); } 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); /** * 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__) #else # define av_dlog(pctx, ...) do { if (0) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0) #endif /** * 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 */ #define AV_LOG_SKIP_REPEATED 1 void av_log_set_flags(int arg); #endif /* AVUTIL_LOG_H */