bin64/fluidsynth-2.0.0/usr/include/fluidsynth/log.h

   1 /* FluidSynth - A Software Synthesizer
   2  *
   3  * Copyright (C) 2003  Peter Hanappe and others.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public License
   7  * as published by the Free Software Foundation; either version 2.1 of
   8  * the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free
  17  * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  */
  20
  21 #ifndef _FLUIDSYNTH_LOG_H
  22 #define _FLUIDSYNTH_LOG_H
  23
  24
  25 #ifdef __cplusplus
  26 extern "C" {
  27 #endif
  28
  29
  30 /**
  31  * @file log.h
  32  * @brief Logging interface
  33  *
  34  * The default logging function of the fluidsynth prints its messages
  35  * to the stderr. The synthesizer uses five level of messages: #FLUID_PANIC,
  36  * #FLUID_ERR, #FLUID_WARN, #FLUID_INFO, and #FLUID_DBG.
  37  *
  38  * A client application can install a new log function to handle the
  39  * messages differently. In the following example, the application
  40  * sets a callback function to display #FLUID_PANIC messages in a dialog,
  41  * and ignores all other messages by setting the log function to
  42  * NULL:
  43  *
  44  * @code
  45  *   fluid_set_log_function(FLUID_PANIC, show_dialog, (void*) root_window);
  46  *   fluid_set_log_function(FLUID_ERR, NULL, NULL);
  47  *   fluid_set_log_function(FLUID_WARN, NULL, NULL);
  48  *   fluid_set_log_function(FLUID_DBG, NULL, NULL);
  49  * @endcode
  50  */
  51
  52 /**
  53  * FluidSynth log levels.
  54  */
  55 enum fluid_log_level
  56 {
  57     FLUID_PANIC,   /**< The synth can't function correctly any more */
  58     FLUID_ERR,     /**< Serious error occurred */
  59     FLUID_WARN,    /**< Warning */
  60     FLUID_INFO,    /**< Verbose informational messages */
  61     FLUID_DBG,     /**< Debugging messages */
  62 #ifndef __DOXYGEN__
  63     LAST_LOG_LEVEL /**< @warning This symbol is not part of the public API and ABI stability guarantee and may change at any time! */
  64 #endif
  65 };
  66
  67 /**
  68  * Log function handler callback type used by fluid_set_log_function().
  69  * @param level Log level (#fluid_log_level)
  70  * @param message Log message text
  71  * @param data User data pointer supplied to fluid_set_log_function().
  72  */
  73 typedef void (*fluid_log_function_t)(int level, const char *message, void *data);
  74
  75 FLUIDSYNTH_API
  76 fluid_log_function_t fluid_set_log_function(int level, fluid_log_function_t fun, void *data);
  77
  78 FLUIDSYNTH_API void fluid_default_log_function(int level, const char *message, void *data);
  79
  80 FLUIDSYNTH_API int fluid_log(int level, const char *fmt, ...);
  81
  82
  83 #ifdef __cplusplus
  84 }
  85 #endif
  86
  87 #endif /* _FLUIDSYNTH_LOG_H */