/* * OPL4 MIDI synthesizer functions * * Copyright (c) 2003 by Clemens Ladisch <[email protected]> * 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, * without modification. * 2. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * Alternatively, this software may be distributed and/or modified under the * terms of the GNU General Public License as published by the Free Software * Foundation; either version 2 of the License, or (at your option) any later * version. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. */ #include "opl4_local.h" #include <linux/delay.h> #include <linux/io.h> #include <sound/asoundef.h> /* GM2 controllers */ #ifndef MIDI_CTL_RELEASE_TIME #define MIDI_CTL_RELEASE_TIME … #define MIDI_CTL_ATTACK_TIME … #define MIDI_CTL_DECAY_TIME … #define MIDI_CTL_VIBRATO_RATE … #define MIDI_CTL_VIBRATO_DEPTH … #define MIDI_CTL_VIBRATO_DELAY … #endif /* * This table maps 100/128 cents to F_NUMBER. */ static const s16 snd_opl4_pitch_map[0x600] = …; /* * Attenuation according to GM recommendations, in -0.375 dB units. * table[v] = 40 * log(v / 127) / -0.375 */ static const unsigned char snd_opl4_volume_table[128] = …; /* * Initializes all voices. */ void snd_opl4_synth_reset(struct snd_opl4 *opl4) { … } /* * Shuts down all voices. */ void snd_opl4_synth_shutdown(struct snd_opl4 *opl4) { … } /* * Executes the callback for all voices playing the specified note. */ static void snd_opl4_do_for_note(struct snd_opl4 *opl4, int note, struct snd_midi_channel *chan, void (*func)(struct snd_opl4 *opl4, struct opl4_voice *voice)) { … } /* * Executes the callback for all voices of to the specified channel. */ static void snd_opl4_do_for_channel(struct snd_opl4 *opl4, struct snd_midi_channel *chan, void (*func)(struct snd_opl4 *opl4, struct opl4_voice *voice)) { … } /* * Executes the callback for all active voices. */ static void snd_opl4_do_for_all(struct snd_opl4 *opl4, void (*func)(struct snd_opl4 *opl4, struct opl4_voice *voice)) { … } static void snd_opl4_update_volume(struct snd_opl4 *opl4, struct opl4_voice *voice) { … } static void snd_opl4_update_pan(struct snd_opl4 *opl4, struct opl4_voice *voice) { … } static void snd_opl4_update_vibrato_depth(struct snd_opl4 *opl4, struct opl4_voice *voice) { … } static void snd_opl4_update_pitch(struct snd_opl4 *opl4, struct opl4_voice *voice) { … } static void snd_opl4_update_tone_parameters(struct snd_opl4 *opl4, struct opl4_voice *voice) { … } /* allocate one voice */ static struct opl4_voice *snd_opl4_get_voice(struct snd_opl4 *opl4) { … } static void snd_opl4_wait_for_wave_headers(struct snd_opl4 *opl4) { … } void snd_opl4_note_on(void *private_data, int note, int vel, struct snd_midi_channel *chan) { … } static void snd_opl4_voice_off(struct snd_opl4 *opl4, struct opl4_voice *voice) { … } void snd_opl4_note_off(void *private_data, int note, int vel, struct snd_midi_channel *chan) { … } static void snd_opl4_terminate_voice(struct snd_opl4 *opl4, struct opl4_voice *voice) { … } void snd_opl4_terminate_note(void *private_data, int note, struct snd_midi_channel *chan) { … } void snd_opl4_control(void *private_data, int type, struct snd_midi_channel *chan) { … } void snd_opl4_sysex(void *private_data, unsigned char *buf, int len, int parsed, struct snd_midi_channel_set *chset) { … }
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