opl.h

/*
 * Library to access OPL2/OPL3 hardware (YM3812 / YMF262)
 *
 * Copyright (c) 2015, Mateusz Viste
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef opl_h_sentinel
#define opl_h_sentinel

struct timbre_t {
  unsigned long modulator_E862, carrier_E862;
  unsigned char modulator_40, carrier_40;
  unsigned char feedconn;
  signed char finetune;
};

/* Initialize hardware upon startup - positive on success, negative otherwise
 * Returns 0 for OPL2 initialization, or 1 if OPL3 has been detected */
int opl_init(unsigned short port);

/* close OPL device */
void opl_close(unsigned short port);

/* turns off all notes */
void opl_clear(unsigned short port);

/* turn note 'on', on emulated MIDI channel */
void opl_midi_noteon(unsigned short port, int channel, int note, int velocity);

/* turn note 'off', on emulated MIDI channel */
void opl_midi_noteoff(unsigned short port, int channel, int note);

/* adjust the pitch wheel on emulated MIDI channel */
void opl_midi_pitchwheel(unsigned short outport, int channel, int wheelvalue);

/* assign a new instrument to emulated MIDI channel */
void opl_midi_changeprog(int channel, int program);

/* the functions below are not necessarily useful - if you want to play MIDI,
 * you will probably prefer to use the opl_midi_* emulation layer instead of
 * dealing with OPL's voices directly - in any case, do NOT mix calls to MIDI
 * emulation functions (opl_midi_*) with any of the functions below! */

void opl_loadinstrument(unsigned short port, unsigned short voice, struct timbre_t *timbre);

/* turn off note on selected voice */
void opl_noteoff(unsigned short port, unsigned short voice);

/* turn on note on selected voice */
void opl_noteon(unsigned short port, unsigned short voice, unsigned int note, int pitch);

#endif