304 lines
8.7 KiB
C
304 lines
8.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Midi synth routines for the Emu8k/Emu10k1
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*
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* Copyright (C) 1999 Steve Ratcliffe
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* Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
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*
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* Contains code based on awe_wave.c by Takashi Iwai
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*/
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#include "emux_voice.h"
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#include <linux/slab.h>
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#ifdef SNDRV_EMUX_USE_RAW_EFFECT
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/*
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* effects table
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*/
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#define xoffsetof(type,tag) ((long)(&((type)NULL)->tag) - (long)(NULL))
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#define parm_offset(tag) xoffsetof(struct soundfont_voice_parm *, tag)
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#define PARM_IS_BYTE (1 << 0)
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#define PARM_IS_WORD (1 << 1)
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#define PARM_IS_ALIGNED (3 << 2)
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#define PARM_IS_ALIGN_HI (1 << 2)
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#define PARM_IS_ALIGN_LO (2 << 2)
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#define PARM_IS_SIGNED (1 << 4)
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#define PARM_WORD (PARM_IS_WORD)
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#define PARM_BYTE_LO (PARM_IS_BYTE|PARM_IS_ALIGN_LO)
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#define PARM_BYTE_HI (PARM_IS_BYTE|PARM_IS_ALIGN_HI)
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#define PARM_BYTE (PARM_IS_BYTE)
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#define PARM_SIGN_LO (PARM_IS_BYTE|PARM_IS_ALIGN_LO|PARM_IS_SIGNED)
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#define PARM_SIGN_HI (PARM_IS_BYTE|PARM_IS_ALIGN_HI|PARM_IS_SIGNED)
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static struct emux_parm_defs {
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int type; /* byte or word */
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int low, high; /* value range */
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long offset; /* offset in parameter record (-1 = not written) */
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int update; /* flgas for real-time update */
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} parm_defs[EMUX_NUM_EFFECTS] = {
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{PARM_WORD, 0, 0x8000, parm_offset(moddelay), 0}, /* env1 delay */
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{PARM_BYTE_LO, 1, 0x80, parm_offset(modatkhld), 0}, /* env1 attack */
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{PARM_BYTE_HI, 0, 0x7e, parm_offset(modatkhld), 0}, /* env1 hold */
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{PARM_BYTE_LO, 1, 0x7f, parm_offset(moddcysus), 0}, /* env1 decay */
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{PARM_BYTE_LO, 1, 0x7f, parm_offset(modrelease), 0}, /* env1 release */
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{PARM_BYTE_HI, 0, 0x7f, parm_offset(moddcysus), 0}, /* env1 sustain */
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{PARM_BYTE_HI, 0, 0xff, parm_offset(pefe), 0}, /* env1 pitch */
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{PARM_BYTE_LO, 0, 0xff, parm_offset(pefe), 0}, /* env1 fc */
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{PARM_WORD, 0, 0x8000, parm_offset(voldelay), 0}, /* env2 delay */
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{PARM_BYTE_LO, 1, 0x80, parm_offset(volatkhld), 0}, /* env2 attack */
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{PARM_BYTE_HI, 0, 0x7e, parm_offset(volatkhld), 0}, /* env2 hold */
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{PARM_BYTE_LO, 1, 0x7f, parm_offset(voldcysus), 0}, /* env2 decay */
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{PARM_BYTE_LO, 1, 0x7f, parm_offset(volrelease), 0}, /* env2 release */
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{PARM_BYTE_HI, 0, 0x7f, parm_offset(voldcysus), 0}, /* env2 sustain */
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{PARM_WORD, 0, 0x8000, parm_offset(lfo1delay), 0}, /* lfo1 delay */
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{PARM_BYTE_LO, 0, 0xff, parm_offset(tremfrq), SNDRV_EMUX_UPDATE_TREMFREQ}, /* lfo1 freq */
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{PARM_SIGN_HI, -128, 127, parm_offset(tremfrq), SNDRV_EMUX_UPDATE_TREMFREQ}, /* lfo1 vol */
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{PARM_SIGN_HI, -128, 127, parm_offset(fmmod), SNDRV_EMUX_UPDATE_FMMOD}, /* lfo1 pitch */
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{PARM_BYTE_LO, 0, 0xff, parm_offset(fmmod), SNDRV_EMUX_UPDATE_FMMOD}, /* lfo1 cutoff */
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{PARM_WORD, 0, 0x8000, parm_offset(lfo2delay), 0}, /* lfo2 delay */
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{PARM_BYTE_LO, 0, 0xff, parm_offset(fm2frq2), SNDRV_EMUX_UPDATE_FM2FRQ2}, /* lfo2 freq */
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{PARM_SIGN_HI, -128, 127, parm_offset(fm2frq2), SNDRV_EMUX_UPDATE_FM2FRQ2}, /* lfo2 pitch */
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{PARM_WORD, 0, 0xffff, -1, SNDRV_EMUX_UPDATE_PITCH}, /* initial pitch */
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{PARM_BYTE, 0, 0xff, parm_offset(chorus), 0}, /* chorus */
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{PARM_BYTE, 0, 0xff, parm_offset(reverb), 0}, /* reverb */
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{PARM_BYTE, 0, 0xff, parm_offset(cutoff), SNDRV_EMUX_UPDATE_VOLUME}, /* cutoff */
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{PARM_BYTE, 0, 15, parm_offset(filterQ), SNDRV_EMUX_UPDATE_Q}, /* resonance */
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{PARM_WORD, 0, 0xffff, -1, 0}, /* sample start */
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{PARM_WORD, 0, 0xffff, -1, 0}, /* loop start */
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{PARM_WORD, 0, 0xffff, -1, 0}, /* loop end */
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{PARM_WORD, 0, 0xffff, -1, 0}, /* coarse sample start */
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{PARM_WORD, 0, 0xffff, -1, 0}, /* coarse loop start */
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{PARM_WORD, 0, 0xffff, -1, 0}, /* coarse loop end */
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{PARM_BYTE, 0, 0xff, -1, SNDRV_EMUX_UPDATE_VOLUME}, /* initial attenuation */
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};
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/* set byte effect value */
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static void
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effect_set_byte(unsigned char *valp, struct snd_midi_channel *chan, int type)
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{
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short effect;
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struct snd_emux_effect_table *fx = chan->private;
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effect = fx->val[type];
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if (fx->flag[type] == EMUX_FX_FLAG_ADD) {
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if (parm_defs[type].type & PARM_IS_SIGNED)
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effect += *(char*)valp;
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else
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effect += *valp;
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}
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if (effect < parm_defs[type].low)
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effect = parm_defs[type].low;
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else if (effect > parm_defs[type].high)
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effect = parm_defs[type].high;
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*valp = (unsigned char)effect;
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}
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/* set word effect value */
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static void
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effect_set_word(unsigned short *valp, struct snd_midi_channel *chan, int type)
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{
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int effect;
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struct snd_emux_effect_table *fx = chan->private;
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effect = *(unsigned short*)&fx->val[type];
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if (fx->flag[type] == EMUX_FX_FLAG_ADD)
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effect += *valp;
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if (effect < parm_defs[type].low)
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effect = parm_defs[type].low;
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else if (effect > parm_defs[type].high)
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effect = parm_defs[type].high;
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*valp = (unsigned short)effect;
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}
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/* address offset */
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static int
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effect_get_offset(struct snd_midi_channel *chan, int lo, int hi, int mode)
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{
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int addr = 0;
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struct snd_emux_effect_table *fx = chan->private;
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if (fx->flag[hi])
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addr = (short)fx->val[hi];
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addr = addr << 15;
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if (fx->flag[lo])
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addr += (short)fx->val[lo];
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if (!(mode & SNDRV_SFNT_SAMPLE_8BITS))
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addr /= 2;
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return addr;
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}
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#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
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/* change effects - for OSS sequencer compatibility */
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void
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snd_emux_send_effect_oss(struct snd_emux_port *port,
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struct snd_midi_channel *chan, int type, int val)
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{
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int mode;
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if (type & 0x40)
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mode = EMUX_FX_FLAG_OFF;
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else if (type & 0x80)
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mode = EMUX_FX_FLAG_ADD;
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else
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mode = EMUX_FX_FLAG_SET;
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type &= 0x3f;
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snd_emux_send_effect(port, chan, type, val, mode);
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}
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#endif
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/* Modify the effect value.
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* if update is necessary, call emu8000_control
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*/
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void
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snd_emux_send_effect(struct snd_emux_port *port, struct snd_midi_channel *chan,
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int type, int val, int mode)
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{
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int i;
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int offset;
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unsigned char *srcp, *origp;
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struct snd_emux *emu;
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struct snd_emux_effect_table *fx;
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unsigned long flags;
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emu = port->emu;
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fx = chan->private;
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if (emu == NULL || fx == NULL)
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return;
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if (type < 0 || type >= EMUX_NUM_EFFECTS)
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return;
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fx->val[type] = val;
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fx->flag[type] = mode;
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/* do we need to modify the register in realtime ? */
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if (!parm_defs[type].update)
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return;
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offset = parm_defs[type].offset;
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if (offset < 0)
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return;
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#ifdef SNDRV_LITTLE_ENDIAN
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if (parm_defs[type].type & PARM_IS_ALIGN_HI)
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offset++;
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#else
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if (parm_defs[type].type & PARM_IS_ALIGN_LO)
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offset++;
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#endif
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/* modify the register values */
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spin_lock_irqsave(&emu->voice_lock, flags);
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for (i = 0; i < emu->max_voices; i++) {
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struct snd_emux_voice *vp = &emu->voices[i];
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if (!STATE_IS_PLAYING(vp->state) || vp->chan != chan)
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continue;
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srcp = (unsigned char*)&vp->reg.parm + offset;
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origp = (unsigned char*)&vp->zone->v.parm + offset;
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if (parm_defs[i].type & PARM_IS_BYTE) {
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*srcp = *origp;
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effect_set_byte(srcp, chan, type);
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} else {
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*(unsigned short*)srcp = *(unsigned short*)origp;
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effect_set_word((unsigned short*)srcp, chan, type);
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}
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}
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spin_unlock_irqrestore(&emu->voice_lock, flags);
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/* activate them */
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snd_emux_update_channel(port, chan, parm_defs[type].update);
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}
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/* copy wavetable registers to voice table */
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void
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snd_emux_setup_effect(struct snd_emux_voice *vp)
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{
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struct snd_midi_channel *chan = vp->chan;
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struct snd_emux_effect_table *fx;
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unsigned char *srcp;
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int i;
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fx = chan->private;
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if (!fx)
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return;
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/* modify the register values via effect table */
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for (i = 0; i < EMUX_FX_END; i++) {
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int offset;
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if (!fx->flag[i])
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continue;
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offset = parm_defs[i].offset;
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if (offset < 0)
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continue;
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#ifdef SNDRV_LITTLE_ENDIAN
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if (parm_defs[i].type & PARM_IS_ALIGN_HI)
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offset++;
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#else
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if (parm_defs[i].type & PARM_IS_ALIGN_LO)
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offset++;
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#endif
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srcp = (unsigned char*)&vp->reg.parm + offset;
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if (parm_defs[i].type & PARM_IS_BYTE)
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effect_set_byte(srcp, chan, i);
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else
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effect_set_word((unsigned short*)srcp, chan, i);
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}
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/* correct sample and loop points */
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vp->reg.start += effect_get_offset(chan, EMUX_FX_SAMPLE_START,
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EMUX_FX_COARSE_SAMPLE_START,
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vp->reg.sample_mode);
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vp->reg.loopstart += effect_get_offset(chan, EMUX_FX_LOOP_START,
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EMUX_FX_COARSE_LOOP_START,
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vp->reg.sample_mode);
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vp->reg.loopend += effect_get_offset(chan, EMUX_FX_LOOP_END,
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EMUX_FX_COARSE_LOOP_END,
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vp->reg.sample_mode);
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}
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/*
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* effect table
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*/
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void
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snd_emux_create_effect(struct snd_emux_port *p)
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{
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int i;
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p->effect = kcalloc(p->chset.max_channels,
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sizeof(struct snd_emux_effect_table), GFP_KERNEL);
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if (p->effect) {
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for (i = 0; i < p->chset.max_channels; i++)
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p->chset.channels[i].private = p->effect + i;
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} else {
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for (i = 0; i < p->chset.max_channels; i++)
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p->chset.channels[i].private = NULL;
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}
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}
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void
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snd_emux_delete_effect(struct snd_emux_port *p)
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{
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kfree(p->effect);
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p->effect = NULL;
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}
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void
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snd_emux_clear_effect(struct snd_emux_port *p)
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{
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if (p->effect) {
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memset(p->effect, 0, sizeof(struct snd_emux_effect_table) *
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p->chset.max_channels);
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}
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}
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#endif /* SNDRV_EMUX_USE_RAW_EFFECT */
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