Logo Search packages:      
Sourcecode: alsa-driver version File versions  Download package

emux_effect.c

/*
 *  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
 *
 *   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 */

Generated by  Doxygen 1.6.0   Back to index