diff options
Diffstat (limited to 'sound/synth/emux/emux_synth.c')
| -rw-r--r-- | sound/synth/emux/emux_synth.c | 968 |
1 files changed, 968 insertions, 0 deletions
diff --git a/sound/synth/emux/emux_synth.c b/sound/synth/emux/emux_synth.c new file mode 100644 index 000000000..a5385efce --- /dev/null +++ b/sound/synth/emux/emux_synth.c @@ -0,0 +1,968 @@ +// 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 <tiwai@suse.de> + * + * 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) do { if ((x) < (a)) (x) = (a); else if ((x) > (b)) (x) = (b); } while (0) +#define LIMITMAX(x, a) do {if ((x) > (a)) (x) = (a); } while (0) + +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) +{ + struct snd_emux *emu; + int i, key, nvoices; + struct snd_emux_voice *vp; + struct snd_sf_zone *table[SNDRV_EMUX_MAX_MULTI_VOICES]; + unsigned long flags; + struct snd_emux_port *port; + + port = p; + if (snd_BUG_ON(!port || !chan)) + return; + + emu = port->emu; + if (snd_BUG_ON(!emu || !emu->ops.get_voice || !emu->ops.trigger)) + return; + + key = note; /* remember the original note */ + nvoices = get_zone(emu, port, ¬e, vel, chan, table); + if (! nvoices) + return; + + /* exclusive note off */ + for (i = 0; i < nvoices; i++) { + struct snd_sf_zone *zp = table[i]; + if (zp && zp->v.exclusiveClass) + exclusive_note_off(emu, port, zp->v.exclusiveClass); + } + +#if 0 // seems not necessary + /* Turn off the same note on the same channel. */ + terminate_note1(emu, key, chan, 0); +#endif + + spin_lock_irqsave(&emu->voice_lock, flags); + for (i = 0; i < nvoices; i++) { + + /* set up each voice parameter */ + /* at this stage, we don't trigger the voice yet. */ + + if (table[i] == NULL) + continue; + + vp = emu->ops.get_voice(emu, port); + if (vp == NULL || vp->ch < 0) + continue; + if (STATE_IS_PLAYING(vp->state)) + emu->ops.terminate(vp); + + vp->time = emu->use_time++; + vp->chan = chan; + vp->port = port; + vp->key = key; + vp->note = note; + vp->velocity = vel; + vp->zone = table[i]; + if (vp->zone->sample) + vp->block = vp->zone->sample->block; + else + vp->block = NULL; + + setup_voice(vp); + + vp->state = SNDRV_EMUX_ST_STANDBY; + if (emu->ops.prepare) { + vp->state = SNDRV_EMUX_ST_OFF; + if (emu->ops.prepare(vp) >= 0) + vp->state = SNDRV_EMUX_ST_STANDBY; + } + } + + /* start envelope now */ + for (i = 0; i < emu->max_voices; i++) { + vp = &emu->voices[i]; + if (vp->state == SNDRV_EMUX_ST_STANDBY && + vp->chan == chan) { + emu->ops.trigger(vp); + vp->state = SNDRV_EMUX_ST_ON; + vp->ontime = jiffies; /* remember the trigger timing */ + } + } + spin_unlock_irqrestore(&emu->voice_lock, flags); + +#ifdef SNDRV_EMUX_USE_RAW_EFFECT + if (port->port_mode == SNDRV_EMUX_PORT_MODE_OSS_SYNTH) { + /* clear voice position for the next note on this channel */ + struct snd_emux_effect_table *fx = chan->private; + if (fx) { + fx->flag[EMUX_FX_SAMPLE_START] = 0; + fx->flag[EMUX_FX_COARSE_SAMPLE_START] = 0; + } + } +#endif +} + +/* + * 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) +{ + int ch; + struct snd_emux *emu; + struct snd_emux_voice *vp; + unsigned long flags; + struct snd_emux_port *port; + + port = p; + if (snd_BUG_ON(!port || !chan)) + return; + + emu = port->emu; + if (snd_BUG_ON(!emu || !emu->ops.release)) + return; + + spin_lock_irqsave(&emu->voice_lock, flags); + for (ch = 0; ch < emu->max_voices; ch++) { + vp = &emu->voices[ch]; + if (STATE_IS_PLAYING(vp->state) && + vp->chan == chan && vp->key == note) { + vp->state = SNDRV_EMUX_ST_RELEASED; + if (vp->ontime == jiffies) { + /* if note-off is sent too shortly after + * note-on, emuX engine cannot produce the sound + * correctly. so we'll release this note + * a bit later via timer callback. + */ + vp->state = SNDRV_EMUX_ST_PENDING; + if (! emu->timer_active) { + mod_timer(&emu->tlist, jiffies + 1); + emu->timer_active = 1; + } + } else + /* ok now release the note */ + emu->ops.release(vp); + } + } + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + +/* + * timer callback + * + * release the pending note-offs + */ +void snd_emux_timer_callback(struct timer_list *t) +{ + struct snd_emux *emu = from_timer(emu, t, tlist); + struct snd_emux_voice *vp; + unsigned long flags; + int ch, do_again = 0; + + spin_lock_irqsave(&emu->voice_lock, flags); + for (ch = 0; ch < emu->max_voices; ch++) { + vp = &emu->voices[ch]; + if (vp->state == SNDRV_EMUX_ST_PENDING) { + if (vp->ontime == jiffies) + do_again++; /* release this at the next interrupt */ + else { + emu->ops.release(vp); + vp->state = SNDRV_EMUX_ST_RELEASED; + } + } + } + if (do_again) { + mod_timer(&emu->tlist, jiffies + 1); + emu->timer_active = 1; + } else + emu->timer_active = 0; + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + +/* + * key pressure change + */ +void +snd_emux_key_press(void *p, int note, int vel, struct snd_midi_channel *chan) +{ + int ch; + struct snd_emux *emu; + struct snd_emux_voice *vp; + unsigned long flags; + struct snd_emux_port *port; + + port = p; + if (snd_BUG_ON(!port || !chan)) + return; + + emu = port->emu; + if (snd_BUG_ON(!emu || !emu->ops.update)) + return; + + spin_lock_irqsave(&emu->voice_lock, flags); + for (ch = 0; ch < emu->max_voices; ch++) { + vp = &emu->voices[ch]; + if (vp->state == SNDRV_EMUX_ST_ON && + vp->chan == chan && vp->key == note) { + vp->velocity = vel; + update_voice(emu, vp, SNDRV_EMUX_UPDATE_VOLUME); + } + } + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + + +/* + * 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) +{ + struct snd_emux *emu; + struct snd_emux_voice *vp; + int i; + unsigned long flags; + + if (! update) + return; + + emu = port->emu; + if (snd_BUG_ON(!emu || !emu->ops.update)) + return; + + spin_lock_irqsave(&emu->voice_lock, flags); + for (i = 0; i < emu->max_voices; i++) { + vp = &emu->voices[i]; + if (vp->chan == chan) + update_voice(emu, vp, update); + } + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + +/* + * Modulate all the voices which belong to the port. + */ +void +snd_emux_update_port(struct snd_emux_port *port, int update) +{ + struct snd_emux *emu; + struct snd_emux_voice *vp; + int i; + unsigned long flags; + + if (! update) + return; + + emu = port->emu; + if (snd_BUG_ON(!emu || !emu->ops.update)) + return; + + spin_lock_irqsave(&emu->voice_lock, flags); + for (i = 0; i < emu->max_voices; i++) { + vp = &emu->voices[i]; + if (vp->port == port) + update_voice(emu, vp, update); + } + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + + +/* + * 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) +{ + struct snd_emux_port *port; + + port = p; + if (snd_BUG_ON(!port || !chan)) + return; + + switch (type) { + case MIDI_CTL_MSB_MAIN_VOLUME: + case MIDI_CTL_MSB_EXPRESSION: + snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_VOLUME); + break; + + case MIDI_CTL_MSB_PAN: + snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_PAN); + break; + + case MIDI_CTL_SOFT_PEDAL: +#ifdef SNDRV_EMUX_USE_RAW_EFFECT + /* FIXME: this is an emulation */ + if (chan->control[type] >= 64) + snd_emux_send_effect(port, chan, EMUX_FX_CUTOFF, -160, + EMUX_FX_FLAG_ADD); + else + snd_emux_send_effect(port, chan, EMUX_FX_CUTOFF, 0, + EMUX_FX_FLAG_OFF); +#endif + break; + + case MIDI_CTL_PITCHBEND: + snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_PITCH); + break; + + case MIDI_CTL_MSB_MODWHEEL: + case MIDI_CTL_CHAN_PRESSURE: + snd_emux_update_channel(port, chan, + SNDRV_EMUX_UPDATE_FMMOD | + SNDRV_EMUX_UPDATE_FM2FRQ2); + break; + + } + + if (port->chset.midi_mode == SNDRV_MIDI_MODE_XG) { + snd_emux_xg_control(port, chan, type); + } +} + + +/* + * 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) +{ + int i; + struct snd_emux_voice *vp; + unsigned long flags; + + spin_lock_irqsave(&emu->voice_lock, flags); + for (i = 0; i < emu->max_voices; i++) { + vp = &emu->voices[i]; + if (STATE_IS_PLAYING(vp->state) && vp->chan == chan && + vp->key == note) + terminate_voice(emu, vp, free); + } + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + + +/* + * terminate note - exported for midi emulation + */ +void +snd_emux_terminate_note(void *p, int note, struct snd_midi_channel *chan) +{ + struct snd_emux *emu; + struct snd_emux_port *port; + + port = p; + if (snd_BUG_ON(!port || !chan)) + return; + + emu = port->emu; + if (snd_BUG_ON(!emu || !emu->ops.terminate)) + return; + + terminate_note1(emu, note, chan, 1); +} + + +/* + * Terminate all the notes + */ +void +snd_emux_terminate_all(struct snd_emux *emu) +{ + int i; + struct snd_emux_voice *vp; + unsigned long flags; + + spin_lock_irqsave(&emu->voice_lock, flags); + for (i = 0; i < emu->max_voices; i++) { + vp = &emu->voices[i]; + if (STATE_IS_PLAYING(vp->state)) + terminate_voice(emu, vp, 0); + if (vp->state == SNDRV_EMUX_ST_OFF) { + if (emu->ops.free_voice) + emu->ops.free_voice(vp); + if (emu->ops.reset) + emu->ops.reset(emu, i); + } + vp->time = 0; + } + /* initialize allocation time */ + emu->use_time = 0; + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + +EXPORT_SYMBOL(snd_emux_terminate_all); + +/* + * Terminate all voices associated with the given port + */ +void +snd_emux_sounds_off_all(struct snd_emux_port *port) +{ + int i; + struct snd_emux *emu; + struct snd_emux_voice *vp; + unsigned long flags; + + if (snd_BUG_ON(!port)) + return; + emu = port->emu; + if (snd_BUG_ON(!emu || !emu->ops.terminate)) + return; + + spin_lock_irqsave(&emu->voice_lock, flags); + for (i = 0; i < emu->max_voices; i++) { + vp = &emu->voices[i]; + if (STATE_IS_PLAYING(vp->state) && + vp->port == port) + terminate_voice(emu, vp, 0); + if (vp->state == SNDRV_EMUX_ST_OFF) { + if (emu->ops.free_voice) + emu->ops.free_voice(vp); + if (emu->ops.reset) + emu->ops.reset(emu, i); + } + } + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + + +/* + * 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) +{ + struct snd_emux_voice *vp; + int i; + unsigned long flags; + + spin_lock_irqsave(&emu->voice_lock, flags); + for (i = 0; i < emu->max_voices; i++) { + vp = &emu->voices[i]; + if (STATE_IS_PLAYING(vp->state) && vp->port == port && + vp->reg.exclusiveClass == exclass) { + terminate_voice(emu, vp, 0); + } + } + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + +/* + * 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) +{ + emu->ops.terminate(vp); + vp->time = emu->use_time++; + vp->chan = NULL; + vp->port = NULL; + vp->zone = NULL; + vp->block = NULL; + vp->state = SNDRV_EMUX_ST_OFF; + if (free && emu->ops.free_voice) + emu->ops.free_voice(vp); +} + + +/* + * Modulate the voice + */ +static void +update_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int update) +{ + if (!STATE_IS_PLAYING(vp->state)) + return; + + if (vp->chan == NULL || vp->port == NULL) + return; + if (update & SNDRV_EMUX_UPDATE_VOLUME) + calc_volume(vp); + if (update & SNDRV_EMUX_UPDATE_PITCH) + calc_pitch(vp); + if (update & SNDRV_EMUX_UPDATE_PAN) { + if (! calc_pan(vp) && (update == SNDRV_EMUX_UPDATE_PAN)) + return; + } + emu->ops.update(vp, 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) ((v) & 0xff) +#define HI_BYTE(v) (((v) >> 8) & 0xff) + +/* + * Sets up the voice structure by calculating some values that + * will be needed later. + */ +static void +setup_voice(struct snd_emux_voice *vp) +{ + struct soundfont_voice_parm *parm; + int pitch; + + /* copy the original register values */ + vp->reg = vp->zone->v; + +#ifdef SNDRV_EMUX_USE_RAW_EFFECT + snd_emux_setup_effect(vp); +#endif + + /* reset status */ + vp->apan = -1; + vp->avol = -1; + vp->apitch = -1; + + calc_volume(vp); + calc_pitch(vp); + calc_pan(vp); + + parm = &vp->reg.parm; + + /* compute filter target and correct modulation parameters */ + if (LO_BYTE(parm->modatkhld) >= 0x80 && parm->moddelay >= 0x8000) { + parm->moddelay = 0xbfff; + pitch = (HI_BYTE(parm->pefe) << 4) + vp->apitch; + if (pitch > 0xffff) + pitch = 0xffff; + /* calculate filter target */ + vp->ftarget = parm->cutoff + LO_BYTE(parm->pefe); + LIMITVALUE(vp->ftarget, 0, 255); + vp->ftarget <<= 8; + } else { + vp->ftarget = parm->cutoff; + vp->ftarget <<= 8; + pitch = vp->apitch; + } + + /* compute pitch target */ + if (pitch != 0xffff) { + vp->ptarget = 1 << (pitch >> 12); + if (pitch & 0x800) vp->ptarget += (vp->ptarget*0x102e)/0x2710; + if (pitch & 0x400) vp->ptarget += (vp->ptarget*0x764)/0x2710; + if (pitch & 0x200) vp->ptarget += (vp->ptarget*0x389)/0x2710; + vp->ptarget += (vp->ptarget >> 1); + if (vp->ptarget > 0xffff) vp->ptarget = 0xffff; + } else + vp->ptarget = 0xffff; + + if (LO_BYTE(parm->modatkhld) >= 0x80) { + parm->modatkhld &= ~0xff; + parm->modatkhld |= 0x7f; + } + + /* compute volume target and correct volume parameters */ + vp->vtarget = 0; +#if 0 /* FIXME: this leads to some clicks.. */ + if (LO_BYTE(parm->volatkhld) >= 0x80 && parm->voldelay >= 0x8000) { + parm->voldelay = 0xbfff; + vp->vtarget = voltarget[vp->avol % 0x10] >> (vp->avol >> 4); + } +#endif + + if (LO_BYTE(parm->volatkhld) >= 0x80) { + parm->volatkhld &= ~0xff; + parm->volatkhld |= 0x7f; + } +} + +/* + * calculate pitch parameter + */ +static const unsigned char pan_volumes[256] = { +0x00,0x03,0x06,0x09,0x0c,0x0f,0x12,0x14,0x17,0x1a,0x1d,0x20,0x22,0x25,0x28,0x2a, +0x2d,0x30,0x32,0x35,0x37,0x3a,0x3c,0x3f,0x41,0x44,0x46,0x49,0x4b,0x4d,0x50,0x52, +0x54,0x57,0x59,0x5b,0x5d,0x60,0x62,0x64,0x66,0x68,0x6a,0x6c,0x6f,0x71,0x73,0x75, +0x77,0x79,0x7b,0x7c,0x7e,0x80,0x82,0x84,0x86,0x88,0x89,0x8b,0x8d,0x8f,0x90,0x92, +0x94,0x96,0x97,0x99,0x9a,0x9c,0x9e,0x9f,0xa1,0xa2,0xa4,0xa5,0xa7,0xa8,0xaa,0xab, +0xad,0xae,0xaf,0xb1,0xb2,0xb3,0xb5,0xb6,0xb7,0xb9,0xba,0xbb,0xbc,0xbe,0xbf,0xc0, +0xc1,0xc2,0xc3,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,0xcd,0xce,0xcf,0xd0,0xd1, +0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd7,0xd8,0xd9,0xda,0xdb,0xdc,0xdc,0xdd,0xde,0xdf, +0xdf,0xe0,0xe1,0xe2,0xe2,0xe3,0xe4,0xe4,0xe5,0xe6,0xe6,0xe7,0xe8,0xe8,0xe9,0xe9, +0xea,0xeb,0xeb,0xec,0xec,0xed,0xed,0xee,0xee,0xef,0xef,0xf0,0xf0,0xf1,0xf1,0xf1, +0xf2,0xf2,0xf3,0xf3,0xf3,0xf4,0xf4,0xf5,0xf5,0xf5,0xf6,0xf6,0xf6,0xf7,0xf7,0xf7, +0xf7,0xf8,0xf8,0xf8,0xf9,0xf9,0xf9,0xf9,0xf9,0xfa,0xfa,0xfa,0xfa,0xfb,0xfb,0xfb, +0xfb,0xfb,0xfc,0xfc,0xfc,0xfc,0xfc,0xfc,0xfc,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd, +0xfd,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe, +0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, +0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, +}; + +static int +calc_pan(struct snd_emux_voice *vp) +{ + struct snd_midi_channel *chan = vp->chan; + int pan; + + /* pan & loop start (pan 8bit, MSB, 0:right, 0xff:left) */ + if (vp->reg.fixpan > 0) /* 0-127 */ + pan = 255 - (int)vp->reg.fixpan * 2; + else { + pan = chan->control[MIDI_CTL_MSB_PAN] - 64; + if (vp->reg.pan >= 0) /* 0-127 */ + pan += vp->reg.pan - 64; + pan = 127 - (int)pan * 2; + } + LIMITVALUE(pan, 0, 255); + + if (vp->emu->linear_panning) { + /* assuming linear volume */ + if (pan != vp->apan) { + vp->apan = pan; + if (pan == 0) + vp->aaux = 0xff; + else + vp->aaux = (-pan) & 0xff; + return 1; + } else + return 0; + } else { + /* using volume table */ + if (vp->apan != (int)pan_volumes[pan]) { + vp->apan = pan_volumes[pan]; + vp->aaux = pan_volumes[255 - pan]; + return 1; + } + return 0; + } +} + + +/* + * 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] = { + 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, + 0x63, 0x2b, 0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, + 0x21, 0x20, 0x1f, 0x1e, 0x1e, 0x1d, 0x1c, 0x1b, 0x1b, 0x1a, + 0x19, 0x19, 0x18, 0x17, 0x17, 0x16, 0x16, 0x15, 0x15, 0x14, + 0x14, 0x13, 0x13, 0x13, 0x12, 0x12, 0x11, 0x11, 0x11, 0x10, + 0x10, 0x10, 0x0f, 0x0f, 0x0f, 0x0e, 0x0e, 0x0e, 0x0e, 0x0d, + 0x0d, 0x0d, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0b, 0x0b, 0x0b, + 0x0b, 0x0a, 0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x09, 0x09, 0x09, + 0x08, 0x08, 0x08, 0x08, 0x08, 0x07, 0x07, 0x07, 0x07, 0x06, + 0x06, 0x06, 0x06, 0x06, 0x05, 0x05, 0x05, 0x05, 0x05, 0x04, + 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x03, 0x03, 0x02, + 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, + 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 +}; + +static const unsigned char voltab2[128] = { + 0x32, 0x31, 0x30, 0x2f, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x2a, + 0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x24, 0x23, 0x22, 0x21, + 0x21, 0x20, 0x1f, 0x1e, 0x1e, 0x1d, 0x1c, 0x1c, 0x1b, 0x1a, + 0x1a, 0x19, 0x19, 0x18, 0x18, 0x17, 0x16, 0x16, 0x15, 0x15, + 0x14, 0x14, 0x13, 0x13, 0x13, 0x12, 0x12, 0x11, 0x11, 0x10, + 0x10, 0x10, 0x0f, 0x0f, 0x0f, 0x0e, 0x0e, 0x0e, 0x0d, 0x0d, + 0x0d, 0x0c, 0x0c, 0x0c, 0x0b, 0x0b, 0x0b, 0x0b, 0x0a, 0x0a, + 0x0a, 0x0a, 0x09, 0x09, 0x09, 0x09, 0x09, 0x08, 0x08, 0x08, + 0x08, 0x08, 0x07, 0x07, 0x07, 0x07, 0x07, 0x06, 0x06, 0x06, + 0x06, 0x06, 0x06, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, + 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x03, + 0x03, 0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, + 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 +}; + +static const unsigned char expressiontab[128] = { + 0x7f, 0x6c, 0x62, 0x5a, 0x54, 0x50, 0x4b, 0x48, 0x45, 0x42, + 0x40, 0x3d, 0x3b, 0x39, 0x38, 0x36, 0x34, 0x33, 0x31, 0x30, + 0x2f, 0x2d, 0x2c, 0x2b, 0x2a, 0x29, 0x28, 0x27, 0x26, 0x25, + 0x24, 0x24, 0x23, 0x22, 0x21, 0x21, 0x20, 0x1f, 0x1e, 0x1e, + 0x1d, 0x1d, 0x1c, 0x1b, 0x1b, 0x1a, 0x1a, 0x19, 0x18, 0x18, + 0x17, 0x17, 0x16, 0x16, 0x15, 0x15, 0x15, 0x14, 0x14, 0x13, + 0x13, 0x12, 0x12, 0x11, 0x11, 0x11, 0x10, 0x10, 0x0f, 0x0f, + 0x0f, 0x0e, 0x0e, 0x0e, 0x0d, 0x0d, 0x0d, 0x0c, 0x0c, 0x0c, + 0x0b, 0x0b, 0x0b, 0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x09, 0x09, + 0x08, 0x08, 0x08, 0x07, 0x07, 0x07, 0x07, 0x06, 0x06, 0x06, + 0x06, 0x05, 0x05, 0x05, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, + 0x03, 0x03, 0x03, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, + 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 +}; + +/* + * Magic to calculate the volume (actually attenuation) from all the + * voice and channels parameters. + */ +static int +calc_volume(struct snd_emux_voice *vp) +{ + int vol; + int main_vol, expression_vol, master_vol; + struct snd_midi_channel *chan = vp->chan; + struct snd_emux_port *port = vp->port; + + expression_vol = chan->control[MIDI_CTL_MSB_EXPRESSION]; + LIMITMAX(vp->velocity, 127); + LIMITVALUE(expression_vol, 0, 127); + if (port->port_mode == SNDRV_EMUX_PORT_MODE_OSS_SYNTH) { + /* 0 - 127 */ + main_vol = chan->control[MIDI_CTL_MSB_MAIN_VOLUME]; + vol = (vp->velocity * main_vol * expression_vol) / (127*127); + vol = vol * vp->reg.amplitude / 127; + + LIMITVALUE(vol, 0, 127); + + /* calc to attenuation */ + vol = snd_sf_vol_table[vol]; + + } else { + main_vol = chan->control[MIDI_CTL_MSB_MAIN_VOLUME] * vp->reg.amplitude / 127; + LIMITVALUE(main_vol, 0, 127); + + vol = voltab1[main_vol] + voltab2[vp->velocity]; + vol = (vol * 8) / 3; + vol += vp->reg.attenuation; + vol += ((0x100 - vol) * expressiontab[expression_vol])/128; + } + + master_vol = port->chset.gs_master_volume; + LIMITVALUE(master_vol, 0, 127); + vol += snd_sf_vol_table[master_vol]; + vol += port->volume_atten; + +#ifdef SNDRV_EMUX_USE_RAW_EFFECT + if (chan->private) { + struct snd_emux_effect_table *fx = chan->private; + vol += fx->val[EMUX_FX_ATTEN]; + } +#endif + + LIMITVALUE(vol, 0, 255); + if (vp->avol == vol) + return 0; /* value unchanged */ + + vp->avol = vol; + if (!SF_IS_DRUM_BANK(get_bank(port, chan)) + && LO_BYTE(vp->reg.parm.volatkhld) < 0x7d) { + int atten; + if (vp->velocity < 70) + atten = 70; + else + atten = vp->velocity; + vp->acutoff = (atten * vp->reg.parm.cutoff + 0xa0) >> 7; + } else { + vp->acutoff = vp->reg.parm.cutoff; + } + + return 1; /* value changed */ +} + +/* + * 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) +{ + struct snd_midi_channel *chan = vp->chan; + int offset; + + /* calculate offset */ + if (vp->reg.fixkey >= 0) { + offset = (vp->reg.fixkey - vp->reg.root) * 4096 / 12; + } else { + offset = (vp->note - vp->reg.root) * 4096 / 12; + } + offset = (offset * vp->reg.scaleTuning) / 100; + offset += vp->reg.tune * 4096 / 1200; + if (chan->midi_pitchbend != 0) { + /* (128 * 8192: 1 semitone) ==> (4096: 12 semitones) */ + offset += chan->midi_pitchbend * chan->gm_rpn_pitch_bend_range / 3072; + } + + /* tuning via RPN: + * coarse = -8192 to 8192 (100 cent per 128) + * fine = -8192 to 8192 (max=100cent) + */ + /* 4096 = 1200 cents in emu8000 parameter */ + offset += chan->gm_rpn_coarse_tuning * 4096 / (12 * 128); + offset += chan->gm_rpn_fine_tuning / 24; + +#ifdef SNDRV_EMUX_USE_RAW_EFFECT + /* add initial pitch correction */ + if (chan->private) { + struct snd_emux_effect_table *fx = chan->private; + if (fx->flag[EMUX_FX_INIT_PITCH]) + offset += fx->val[EMUX_FX_INIT_PITCH]; + } +#endif + + /* 0xe000: root pitch */ + offset += 0xe000 + vp->reg.rate_offset; + offset += vp->emu->pitch_shift; + LIMITVALUE(offset, 0, 0xffff); + if (offset == vp->apitch) + return 0; /* unchanged */ + vp->apitch = offset; + return 1; /* value changed */ +} + +/* + * Get the bank number assigned to the channel + */ +static int +get_bank(struct snd_emux_port *port, struct snd_midi_channel *chan) +{ + int val; + + switch (port->chset.midi_mode) { + case SNDRV_MIDI_MODE_XG: + val = chan->control[MIDI_CTL_MSB_BANK]; + if (val == 127) + return 128; /* return drum bank */ + return chan->control[MIDI_CTL_LSB_BANK]; + + case SNDRV_MIDI_MODE_GS: + if (chan->drum_channel) + return 128; + /* ignore LSB (bank map) */ + return chan->control[MIDI_CTL_MSB_BANK]; + + default: + if (chan->drum_channel) + return 128; + return chan->control[MIDI_CTL_MSB_BANK]; + } +} + + +/* 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) +{ + int preset, bank, def_preset, def_bank; + + bank = get_bank(port, chan); + preset = chan->midi_program; + + if (SF_IS_DRUM_BANK(bank)) { + def_preset = port->ctrls[EMUX_MD_DEF_DRUM]; + def_bank = bank; + } else { + def_preset = preset; + def_bank = port->ctrls[EMUX_MD_DEF_BANK]; + } + + return snd_soundfont_search_zone(emu->sflist, notep, vel, preset, bank, + def_preset, def_bank, + table, SNDRV_EMUX_MAX_MULTI_VOICES); +} + +/* + */ +void +snd_emux_init_voices(struct snd_emux *emu) +{ + struct snd_emux_voice *vp; + int i; + unsigned long flags; + + spin_lock_irqsave(&emu->voice_lock, flags); + for (i = 0; i < emu->max_voices; i++) { + vp = &emu->voices[i]; + vp->ch = -1; /* not used */ + vp->state = SNDRV_EMUX_ST_OFF; + vp->chan = NULL; + vp->port = NULL; + vp->time = 0; + vp->emu = emu; + vp->hw = emu->hw; + } + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + +/* + */ +void snd_emux_lock_voice(struct snd_emux *emu, int voice) +{ + unsigned long flags; + + spin_lock_irqsave(&emu->voice_lock, flags); + if (emu->voices[voice].state == SNDRV_EMUX_ST_OFF) + emu->voices[voice].state = SNDRV_EMUX_ST_LOCKED; + else + snd_printk(KERN_WARNING + "invalid voice for lock %d (state = %x)\n", + voice, emu->voices[voice].state); + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + +EXPORT_SYMBOL(snd_emux_lock_voice); + +/* + */ +void snd_emux_unlock_voice(struct snd_emux *emu, int voice) +{ + unsigned long flags; + + spin_lock_irqsave(&emu->voice_lock, flags); + if (emu->voices[voice].state == SNDRV_EMUX_ST_LOCKED) + emu->voices[voice].state = SNDRV_EMUX_ST_OFF; + else + snd_printk(KERN_WARNING + "invalid voice for unlock %d (state = %x)\n", + voice, emu->voices[voice].state); + spin_unlock_irqrestore(&emu->voice_lock, flags); +} + +EXPORT_SYMBOL(snd_emux_unlock_voice); |