/*

 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>

 *

 * This file is part of Libav.

 *

 * Libav 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.

 *

 * Libav 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 Libav; 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);

/**

 * 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, ...)

#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, ""); at the end

 */

#define AV_LOG_SKIP_REPEATED 1

void av_log_set_flags(int arg);

#endif /* AVUTIL_LOG_H */