WildMidi_InitVIO(3) WildMidi Programmer's Manual WildMidi_InitVIO(3) NAME WildMidi_InitVIO - Initialize the library with file I/O callbacks LIBRARY libWildMidi SYNOPSIS #include <wildmidi_lib.h> WildMidi_InitVIO (struct _WM_VIO *callbacks, const char *config_file, uint16_t rate, uint16_t options) DESCRIPTION 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. optionsThe 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 re- sampling 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 op- tion 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 try- ing this option. This option added due to some software not supporting fractional tempos allowable in the MIDI specifica- tion. 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. SEE ALSO WildMidi_GetVersion(3), WildMidi_MasterVolume(3), WildMidi_Open(3), Wild- Midi_OpenBuffer(3), WildMidi_SetOption(3), WildMidi_GetOutput(3), Wild- Midi_GetMidiOutput(3), WildMidi_GetInfo(3), WildMidi_FastSeek(3), Wild- Midi_Close(3), WildMidi_Shutdown(3), wildmidi.cfg(5) AUTHOR Chris Ison <chrisisonwildcode@gmail.com> Bret Curtis <psi29a@gmail.com> COPYRIGHT 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/>. This manpage is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported License. To view a copy of this license, visit http://cre- ativecommons.org/licenses/by-sa/3.0/ or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA. 18 May 2018 WildMidi_InitVIO(3)
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