// SPDX-License-Identifier: GPL-2.0-or-later /* * Midi synth routines for the Emu8k/Emu10k1 * * Copyright (C) 1999 Steve Ratcliffe * Copyright (c) 1999-2000 Takashi Iwai <[email protected]> * * Contains code based on awe_wave.c by Takashi Iwai */ #include <linux/export.h> #include "emux_voice.h" #include <sound/asoundef.h> /* * Prototypes */ /* * Ensure a value is between two points * macro evaluates its args more than once, so changed to upper-case. */ #define LIMITVALUE(x, a, b) … #define LIMITMAX(x, a) … static int get_zone(struct snd_emux *emu, struct snd_emux_port *port, int *notep, int vel, struct snd_midi_channel *chan, struct snd_sf_zone **table); static int get_bank(struct snd_emux_port *port, struct snd_midi_channel *chan); static void terminate_note1(struct snd_emux *emu, int note, struct snd_midi_channel *chan, int free); static void exclusive_note_off(struct snd_emux *emu, struct snd_emux_port *port, int exclass); static void terminate_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int free); static void update_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int update); static void setup_voice(struct snd_emux_voice *vp); static int calc_pan(struct snd_emux_voice *vp); static int calc_volume(struct snd_emux_voice *vp); static int calc_pitch(struct snd_emux_voice *vp); /* * Start a note. */ void snd_emux_note_on(void *p, int note, int vel, struct snd_midi_channel *chan) { … } /* * Release a note in response to a midi note off. */ void snd_emux_note_off(void *p, int note, int vel, struct snd_midi_channel *chan) { … } /* * timer callback * * release the pending note-offs */ void snd_emux_timer_callback(struct timer_list *t) { … } /* * key pressure change */ void snd_emux_key_press(void *p, int note, int vel, struct snd_midi_channel *chan) { … } /* * Modulate the voices which belong to the channel */ void snd_emux_update_channel(struct snd_emux_port *port, struct snd_midi_channel *chan, int update) { … } /* * Modulate all the voices which belong to the port. */ void snd_emux_update_port(struct snd_emux_port *port, int update) { … } /* * Deal with a controller type event. This includes all types of * control events, not just the midi controllers */ void snd_emux_control(void *p, int type, struct snd_midi_channel *chan) { … } /* * terminate note - if free flag is true, free the terminated voice */ static void terminate_note1(struct snd_emux *emu, int note, struct snd_midi_channel *chan, int free) { … } /* * terminate note - exported for midi emulation */ void snd_emux_terminate_note(void *p, int note, struct snd_midi_channel *chan) { … } /* * Terminate all the notes */ void snd_emux_terminate_all(struct snd_emux *emu) { … } EXPORT_SYMBOL(…); /* * Terminate all voices associated with the given port */ void snd_emux_sounds_off_all(struct snd_emux_port *port) { … } /* * Terminate all voices that have the same exclusive class. This * is mainly for drums. */ static void exclusive_note_off(struct snd_emux *emu, struct snd_emux_port *port, int exclass) { … } /* * terminate a voice * if free flag is true, call free_voice after termination */ static void terminate_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int free) { … } /* * Modulate the voice */ static void update_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int update) { … } #if 0 // not used /* table for volume target calculation */ static const unsigned short voltarget[16] = { 0xEAC0, 0xE0C8, 0xD740, 0xCE20, 0xC560, 0xBD08, 0xB500, 0xAD58, 0xA5F8, 0x9EF0, 0x9830, 0x91C0, 0x8B90, 0x85A8, 0x8000, 0x7A90 }; #endif #define LO_BYTE(v) … #define HI_BYTE(v) … /* * Sets up the voice structure by calculating some values that * will be needed later. */ static void setup_voice(struct snd_emux_voice *vp) { … } /* * calculate pitch parameter */ static const unsigned char pan_volumes[256] = …; static int calc_pan(struct snd_emux_voice *vp) { … } /* * calculate volume attenuation * * Voice volume is controlled by volume attenuation parameter. * So volume becomes maximum when avol is 0 (no attenuation), and * minimum when 255 (-96dB or silence). */ /* tables for volume->attenuation calculation */ static const unsigned char voltab1[128] = …; static const unsigned char voltab2[128] = …; static const unsigned char expressiontab[128] = …; /* * Magic to calculate the volume (actually attenuation) from all the * voice and channels parameters. */ static int calc_volume(struct snd_emux_voice *vp) { … } /* * calculate pitch offset * * 0xE000 is no pitch offset at 44100Hz sample. * Every 4096 is one octave. */ static int calc_pitch(struct snd_emux_voice *vp) { … } /* * Get the bank number assigned to the channel */ static int get_bank(struct snd_emux_port *port, struct snd_midi_channel *chan) { … } /* Look for the zones matching with the given note and velocity. * The resultant zones are stored on table. */ static int get_zone(struct snd_emux *emu, struct snd_emux_port *port, int *notep, int vel, struct snd_midi_channel *chan, struct snd_sf_zone **table) { … } /* */ void snd_emux_init_voices(struct snd_emux *emu) { … } /* */ void snd_emux_lock_voice(struct snd_emux *emu, int voice) { … } EXPORT_SYMBOL(…); /* */ void snd_emux_unlock_voice(struct snd_emux *emu, int voice) { … } EXPORT_SYMBOL(…);
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