Manpages - WildMidi_InitVIO.3

WildMidi_InitVIO - Initialize the library with file I/O callbacks

libWildMidi

#include <wildmidi_lib.h>

WildMidi_InitVIO (struct _WM_VIO */callbacks/, const char */config_file/, uint16_t rate, uint16_t options)

Initializes libWildMidi in preparation for playback, and sets the function pointers for file I/O as provided by the caller. This function only needs to be called once by the program using libWildMidi.

callbacks

Pointer to a file IO callbacks structure. The _WM_VIO structure is like the following:

  struct _WM_VIO {
   /* This function should allocate a buffer which has the size
    * of the requested file plus one (size+1), fill the buffer
    * with the file content, and the second parameter with the
    * size of the file. */
      void * (* allocate_file)(const char *, uint32_t *);

   /* This function should free the memory of the given buffer */
      void   (* free_file)    (void *);
  };

config-file

The file that contains the instrument configuration for the library.

rate

The sound rate you want the the audio data output at. Rates accepted by libWildMidi are 11025 - 65000.

options

The initial options to set for the library. see below.

WM_MO_LOG_VOLUME

By default the library uses linear volume levels typically used in computer MIDI players. These can differ somewhat to volume levels found on some midi hardware which may use a volume curve based on decibels. This option sets the volume levels to what you’d expect on such devices.

WM_MO_ENHANCED_RESAMPLING

By default libWildMidi uses linear interpolation for the resampling of the sound samples. Setting this option enables the library to use a resampling method that attempts to fill in the gaps giving richer sound.

WM_MO_REVERB

libWildMidi has an 8 reflection reverb engine. Use this option to give more depth to the output.

WM_MO_WHOLETEMPO

Ignores the fractional or decimal part of a tempo setting. If you are having timing issues try WM_MO_ROUNDTEMPO before trying this option. This option added due to some software not supporting fractional tempos allowable in the MIDI specification.

WM_MO_ROUNDTEMPO

Rounds the fractional or decimal part of a tempo setting. Try this option is you are having timing issues, if this fails then try WM_MO_WHOLETEMPO. This option added due to some software not supporting fractional tempos allowable in the MIDI specification.

WildMidi_GetVersion*(3),* WildMidi_MasterVolume*(3),* WildMidi_Open*(3),* WildMidi_OpenBuffer*(3),* WildMidi_SetOption*(3),* WildMidi_GetOutput*(3),* WildMidi_GetMidiOutput*(3),* WildMidi_GetInfo*(3),* WildMidi_FastSeek*(3),* WildMidi_Close*(3),* WildMidi_Shutdown*(3),* *wildmidi.cfg*(5)

Chris Ison <chrisisonwildcode@gmail.com> Bret Curtis <psi29a@gmail.com>

Copyright (C) WildMidi Developers 2001-2016

This file is part of WildMIDI.

WildMIDI is free software: you can redistribute and/or modify the player under the terms of the GNU General Public License and you can redistribute and/or modify the library under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the licenses, or(at your option) any later version.

WildMIDI 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 and the GNU Lesser General Public License for more details.

You should have received a copy of the GNU General Public License and the GNU Lesser General Public License along with WildMIDI. If not, see http://www.gnu.org/licenses/.

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