author | alfadur |
Wed, 16 May 2018 18:37:17 -0400 | |
changeset 13396 | 04d1521cb7b8 |
parent 7813 | 7ac83d79b897 |
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/* |
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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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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 loging is stored. |
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* for example a decoder that uses eval.c could pass its AVCodecContext to eval as such |
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* parent context. And a av_log() implementation could then display the parent context |
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* can be NULL of course |
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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 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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/* av_log API */ |
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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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#define AV_LOG_INFO 32 |
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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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* 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 av_vlog callback |
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* function. |
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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, lower values signifying |
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* higher importance. |
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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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* @see av_vlog |
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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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void av_vlog(void *avcl, int level, const char *fmt, va_list); |
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int av_log_get_level(void); |
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void av_log_set_level(int); |
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void av_log_set_callback(void (*)(void*, int, const char*, va_list)); |
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void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl); |
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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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#endif /* AVUTIL_LOG_H */ |