emux_effect.c

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/*
 *  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
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it 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 program 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 for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include "emux_voice.h"
#include <linux/slab.h>

#ifdef SNDRV_EMUX_USE_RAW_EFFECT
/*
 * effects table
 */

#define xoffsetof(type,tag) ((long)(&((type)NULL)->tag) - (long)(NULL))

#define parm_offset(tag)    xoffsetof(struct soundfont_voice_parm *, tag)

#define PARM_IS_BYTE        (1 << 0)
#define PARM_IS_WORD        (1 << 1)
#define PARM_IS_ALIGNED     (3 << 2)
#define PARM_IS_ALIGN_HI    (1 << 2)
#define PARM_IS_ALIGN_LO    (2 << 2)
#define PARM_IS_SIGNED      (1 << 4)

#define PARM_WORD   (PARM_IS_WORD)
#define PARM_BYTE_LO    (PARM_IS_BYTE|PARM_IS_ALIGN_LO)
#define PARM_BYTE_HI    (PARM_IS_BYTE|PARM_IS_ALIGN_HI)
#define PARM_BYTE   (PARM_IS_BYTE)
#define PARM_SIGN_LO    (PARM_IS_BYTE|PARM_IS_ALIGN_LO|PARM_IS_SIGNED)
#define PARM_SIGN_HI    (PARM_IS_BYTE|PARM_IS_ALIGN_HI|PARM_IS_SIGNED)

static struct emux_parm_defs {
    int type;   /* byte or word */
    int low, high;  /* value range */
    long offset;    /* offset in parameter record (-1 = not written) */
    int update; /* flgas for real-time update */
} parm_defs[EMUX_NUM_EFFECTS] = {
    {PARM_WORD, 0, 0x8000, parm_offset(moddelay), 0},   /* env1 delay */
    {PARM_BYTE_LO, 1, 0x80, parm_offset(modatkhld), 0}, /* env1 attack */
    {PARM_BYTE_HI, 0, 0x7e, parm_offset(modatkhld), 0}, /* env1 hold */
    {PARM_BYTE_LO, 1, 0x7f, parm_offset(moddcysus), 0}, /* env1 decay */
    {PARM_BYTE_LO, 1, 0x7f, parm_offset(modrelease), 0},    /* env1 release */
    {PARM_BYTE_HI, 0, 0x7f, parm_offset(moddcysus), 0}, /* env1 sustain */
    {PARM_BYTE_HI, 0, 0xff, parm_offset(pefe), 0},  /* env1 pitch */
    {PARM_BYTE_LO, 0, 0xff, parm_offset(pefe), 0},  /* env1 fc */

    {PARM_WORD, 0, 0x8000, parm_offset(voldelay), 0},   /* env2 delay */
    {PARM_BYTE_LO, 1, 0x80, parm_offset(volatkhld), 0}, /* env2 attack */
    {PARM_BYTE_HI, 0, 0x7e, parm_offset(volatkhld), 0}, /* env2 hold */
    {PARM_BYTE_LO, 1, 0x7f, parm_offset(voldcysus), 0}, /* env2 decay */
    {PARM_BYTE_LO, 1, 0x7f, parm_offset(volrelease), 0},    /* env2 release */
    {PARM_BYTE_HI, 0, 0x7f, parm_offset(voldcysus), 0}, /* env2 sustain */

    {PARM_WORD, 0, 0x8000, parm_offset(lfo1delay), 0},  /* lfo1 delay */
    {PARM_BYTE_LO, 0, 0xff, parm_offset(tremfrq), SNDRV_EMUX_UPDATE_TREMFREQ},  /* lfo1 freq */
    {PARM_SIGN_HI, -128, 127, parm_offset(tremfrq), SNDRV_EMUX_UPDATE_TREMFREQ},    /* lfo1 vol */
    {PARM_SIGN_HI, -128, 127, parm_offset(fmmod), SNDRV_EMUX_UPDATE_FMMOD}, /* lfo1 pitch */
    {PARM_BYTE_LO, 0, 0xff, parm_offset(fmmod), SNDRV_EMUX_UPDATE_FMMOD},   /* lfo1 cutoff */

    {PARM_WORD, 0, 0x8000, parm_offset(lfo2delay), 0},  /* lfo2 delay */
    {PARM_BYTE_LO, 0, 0xff, parm_offset(fm2frq2), SNDRV_EMUX_UPDATE_FM2FRQ2},   /* lfo2 freq */
    {PARM_SIGN_HI, -128, 127, parm_offset(fm2frq2), SNDRV_EMUX_UPDATE_FM2FRQ2}, /* lfo2 pitch */

    {PARM_WORD, 0, 0xffff, -1, SNDRV_EMUX_UPDATE_PITCH},    /* initial pitch */
    {PARM_BYTE, 0, 0xff, parm_offset(chorus), 0},   /* chorus */
    {PARM_BYTE, 0, 0xff, parm_offset(reverb), 0},   /* reverb */
    {PARM_BYTE, 0, 0xff, parm_offset(cutoff), SNDRV_EMUX_UPDATE_VOLUME},    /* cutoff */
    {PARM_BYTE, 0, 15, parm_offset(filterQ), SNDRV_EMUX_UPDATE_Q},  /* resonance */

    {PARM_WORD, 0, 0xffff, -1, 0},  /* sample start */
    {PARM_WORD, 0, 0xffff, -1, 0},  /* loop start */
    {PARM_WORD, 0, 0xffff, -1, 0},  /* loop end */
    {PARM_WORD, 0, 0xffff, -1, 0},  /* coarse sample start */
    {PARM_WORD, 0, 0xffff, -1, 0},  /* coarse loop start */
    {PARM_WORD, 0, 0xffff, -1, 0},  /* coarse loop end */
    {PARM_BYTE, 0, 0xff, -1, SNDRV_EMUX_UPDATE_VOLUME}, /* initial attenuation */
};

/* set byte effect value */
static void
effect_set_byte(unsigned char *valp, struct snd_midi_channel *chan, int type)
{
    short effect;
    struct snd_emux_effect_table *fx = chan->private;

    effect = fx->val[type];
    if (fx->flag[type] == EMUX_FX_FLAG_ADD) {
        if (parm_defs[type].type & PARM_IS_SIGNED)
            effect += *(char*)valp;
        else
            effect += *valp;
    }
    if (effect < parm_defs[type].low)
        effect = parm_defs[type].low;
    else if (effect > parm_defs[type].high)
        effect = parm_defs[type].high;
    *valp = (unsigned char)effect;
}

/* set word effect value */
static void
effect_set_word(unsigned short *valp, struct snd_midi_channel *chan, int type)
{
    int effect;
    struct snd_emux_effect_table *fx = chan->private;

    effect = *(unsigned short*)&fx->val[type];
    if (fx->flag[type] == EMUX_FX_FLAG_ADD)
        effect += *valp;
    if (effect < parm_defs[type].low)
        effect = parm_defs[type].low;
    else if (effect > parm_defs[type].high)
        effect = parm_defs[type].high;
    *valp = (unsigned short)effect;
}

/* address offset */
static int
effect_get_offset(struct snd_midi_channel *chan, int lo, int hi, int mode)
{
    int addr = 0;
    struct snd_emux_effect_table *fx = chan->private;

    if (fx->flag[hi])
        addr = (short)fx->val[hi];
    addr = addr << 15;
    if (fx->flag[lo])
        addr += (short)fx->val[lo];
    if (!(mode & SNDRV_SFNT_SAMPLE_8BITS))
        addr /= 2;
    return addr;
}

#ifdef CONFIG_SND_SEQUENCER_OSS
/* change effects - for OSS sequencer compatibility */
void
snd_emux_send_effect_oss(struct snd_emux_port *port,
             struct snd_midi_channel *chan, int type, int val)
{
    int mode;

    if (type & 0x40)
        mode = EMUX_FX_FLAG_OFF;
    else if (type & 0x80)
        mode = EMUX_FX_FLAG_ADD;
    else
        mode = EMUX_FX_FLAG_SET;
    type &= 0x3f;

    snd_emux_send_effect(port, chan, type, val, mode);
}
#endif

/* Modify the effect value.
 * if update is necessary, call emu8000_control
 */
void
snd_emux_send_effect(struct snd_emux_port *port, struct snd_midi_channel *chan,
             int type, int val, int mode)
{
    int i;
    int offset;
    unsigned char *srcp, *origp;
    struct snd_emux *emu;
    struct snd_emux_effect_table *fx;
    unsigned long flags;

    emu = port->emu;
    fx = chan->private;
    if (emu == NULL || fx == NULL)
        return;
    if (type < 0 || type >= EMUX_NUM_EFFECTS)
        return;

    fx->val[type] = val;
    fx->flag[type] = mode;

    /* do we need to modify the register in realtime ? */
    if (! parm_defs[type].update || (offset = parm_defs[type].offset) < 0)
        return;

#ifdef SNDRV_LITTLE_ENDIAN
    if (parm_defs[type].type & PARM_IS_ALIGN_HI)
        offset++;
#else
    if (parm_defs[type].type & PARM_IS_ALIGN_LO)
        offset++;
#endif
    /* modify the register values */
    spin_lock_irqsave(&emu->voice_lock, flags);
    for (i = 0; i < emu->max_voices; i++) {
        struct snd_emux_voice *vp = &emu->voices[i];
        if (!STATE_IS_PLAYING(vp->state) || vp->chan != chan)
            continue;
        srcp = (unsigned char*)&vp->reg.parm + offset;
        origp = (unsigned char*)&vp->zone->v.parm + offset;
        if (parm_defs[i].type & PARM_IS_BYTE) {
            *srcp = *origp;
            effect_set_byte(srcp, chan, type);
        } else {
            *(unsigned short*)srcp = *(unsigned short*)origp;
            effect_set_word((unsigned short*)srcp, chan, type);
        }
    }
    spin_unlock_irqrestore(&emu->voice_lock, flags);

    /* activate them */
    snd_emux_update_channel(port, chan, parm_defs[type].update);
}


/* copy wavetable registers to voice table */
void
snd_emux_setup_effect(struct snd_emux_voice *vp)
{
    struct snd_midi_channel *chan = vp->chan;
    struct snd_emux_effect_table *fx;
    unsigned char *srcp;
    int i;

    if (! (fx = chan->private))
        return;

    /* modify the register values via effect table */
    for (i = 0; i < EMUX_FX_END; i++) {
        int offset;
        if (! fx->flag[i] || (offset = parm_defs[i].offset) < 0)
            continue;
#ifdef SNDRV_LITTLE_ENDIAN
        if (parm_defs[i].type & PARM_IS_ALIGN_HI)
            offset++;
#else
        if (parm_defs[i].type & PARM_IS_ALIGN_LO)
            offset++;
#endif
        srcp = (unsigned char*)&vp->reg.parm + offset;
        if (parm_defs[i].type & PARM_IS_BYTE)
            effect_set_byte(srcp, chan, i);
        else
            effect_set_word((unsigned short*)srcp, chan, i);
    }

    /* correct sample and loop points */
    vp->reg.start += effect_get_offset(chan, EMUX_FX_SAMPLE_START,
                       EMUX_FX_COARSE_SAMPLE_START,
                       vp->reg.sample_mode);

    vp->reg.loopstart += effect_get_offset(chan, EMUX_FX_LOOP_START,
                           EMUX_FX_COARSE_LOOP_START,
                           vp->reg.sample_mode);

    vp->reg.loopend += effect_get_offset(chan, EMUX_FX_LOOP_END,
                         EMUX_FX_COARSE_LOOP_END,
                         vp->reg.sample_mode);
}

/*
 * effect table
 */
void
snd_emux_create_effect(struct snd_emux_port *p)
{
    int i;
    p->effect = kcalloc(p->chset.max_channels,
                sizeof(struct snd_emux_effect_table), GFP_KERNEL);
    if (p->effect) {
        for (i = 0; i < p->chset.max_channels; i++)
            p->chset.channels[i].private = p->effect + i;
    } else {
        for (i = 0; i < p->chset.max_channels; i++)
            p->chset.channels[i].private = NULL;
    }
}

void
snd_emux_delete_effect(struct snd_emux_port *p)
{
    kfree(p->effect);
    p->effect = NULL;
}

void
snd_emux_clear_effect(struct snd_emux_port *p)
{
    if (p->effect) {
        memset(p->effect, 0, sizeof(struct snd_emux_effect_table) *
               p->chset.max_channels);
    }
}

#endif /* SNDRV_EMUX_USE_RAW_EFFECT */