/*  Copyright (C) 2016 Paul Brossier <piem@aubio.org>   This file is part of aubio.   aubio is free software: you can redistribute it and/or modify  it under the terms of the GNU General Public License as published by  the Free Software Foundation, either version 3 of the License, or  (at your option) any later version.   aubio 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 General Public License for more details.   You should have received a copy of the GNU General Public License  along with aubio.  If not, see <http://www.gnu.org/licenses/>. */ #ifndef AUBIO_LOG_H#define AUBIO_LOG_H #ifdef __cplusplusextern "C" {#endif /** \file   Logging features   This file specifies ::aubio_log_set_function and  ::aubio_log_set_level_function, which let you define one or several custom  logging functions to redirect warnings and errors from aubio to your  application. The custom function should have the prototype defined in  ::aubio_log_function_t.   After a call to ::aubio_log_set_level_function, ::aubio_log_reset can be used  to reset each logging functions to the default ones.   \example utils/test-log.c */ /** list of logging levels */enum aubio_log_level {  AUBIO_LOG_ERR, /**< critical errors */  AUBIO_LOG_INF, /**< infos */  AUBIO_LOG_MSG, /**< general messages */  AUBIO_LOG_DBG, /**< debug messages */  AUBIO_LOG_WRN, /**< warnings */  AUBIO_LOG_LAST_LEVEL, /**< number of valid levels */}; /** Logging function prototype, to be passed to ::aubio_log_set_function   \param level log level  \param message text to log  \param data optional closure used by the callback   See @ref utils/test-log.c for an example of logging function.  */typedef void (*aubio_log_function_t)(sint_t level, const char_t *message, void    *data); /** Set logging function for all levels   \param fun the function to be used to log, of type ::aubio_log_function_t  \param data optional closure to be passed to the function (can be NULL if  nothing to pass)  */void aubio_log_set_function(aubio_log_function_t fun, void* data); /** Set logging function for a given level   \param level the level for which to set the logging function  \param fun the function to be used to log, of type ::aubio_log_function_t  \param data optional closure to be passed to the function (can be NULL if  nothing to pass) */aubio_log_function_t aubio_log_set_level_function(sint_t level,    aubio_log_function_t fun, void* data); /** Reset all logging functions to the default one  After calling this function, the default logging function will be used to print error, warning, normal, and debug messages to `stdout` or `stderr`.  */void aubio_log_reset(void); #ifdef __cplusplus}#endif #endif /* AUBIO_LOG_H */