1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Midi synth routines for the Emu8k/Emu10k1
4 *
5 * Copyright (C) 1999 Steve Ratcliffe
6 * Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
7 *
8 * Contains code based on awe_wave.c by Takashi Iwai
9 */
10
11#include "emux_voice.h"
12#include <linux/slab.h>
13
14#ifdef SNDRV_EMUX_USE_RAW_EFFECT
15/*
16 * effects table
17 */
18
19#define xoffsetof(type,tag) ((long)(&((type)NULL)->tag) - (long)(NULL))
20
21#define parm_offset(tag) xoffsetof(struct soundfont_voice_parm *, tag)
22
23#define PARM_IS_BYTE (1 << 0)
24#define PARM_IS_WORD (1 << 1)
25#define PARM_IS_ALIGNED (3 << 2)
26#define PARM_IS_ALIGN_HI (1 << 2)
27#define PARM_IS_ALIGN_LO (2 << 2)
28#define PARM_IS_SIGNED (1 << 4)
29
30#define PARM_WORD (PARM_IS_WORD)
31#define PARM_BYTE_LO (PARM_IS_BYTE|PARM_IS_ALIGN_LO)
32#define PARM_BYTE_HI (PARM_IS_BYTE|PARM_IS_ALIGN_HI)
33#define PARM_BYTE (PARM_IS_BYTE)
34#define PARM_SIGN_LO (PARM_IS_BYTE|PARM_IS_ALIGN_LO|PARM_IS_SIGNED)
35#define PARM_SIGN_HI (PARM_IS_BYTE|PARM_IS_ALIGN_HI|PARM_IS_SIGNED)
36
37static struct emux_parm_defs {
38 int type; /* byte or word */
39 int low, high; /* value range */
40 long offset; /* offset in parameter record (-1 = not written) */
41 int update; /* flgas for real-time update */
42} parm_defs[EMUX_NUM_EFFECTS] = {
43 {PARM_WORD, 0, 0x8000, parm_offset(moddelay), 0}, /* env1 delay */
44 {PARM_BYTE_LO, 1, 0x80, parm_offset(modatkhld), 0}, /* env1 attack */
45 {PARM_BYTE_HI, 0, 0x7e, parm_offset(modatkhld), 0}, /* env1 hold */
46 {PARM_BYTE_LO, 1, 0x7f, parm_offset(moddcysus), 0}, /* env1 decay */
47 {PARM_BYTE_LO, 1, 0x7f, parm_offset(modrelease), 0}, /* env1 release */
48 {PARM_BYTE_HI, 0, 0x7f, parm_offset(moddcysus), 0}, /* env1 sustain */
49 {PARM_BYTE_HI, 0, 0xff, parm_offset(pefe), 0}, /* env1 pitch */
50 {PARM_BYTE_LO, 0, 0xff, parm_offset(pefe), 0}, /* env1 fc */
51
52 {PARM_WORD, 0, 0x8000, parm_offset(voldelay), 0}, /* env2 delay */
53 {PARM_BYTE_LO, 1, 0x80, parm_offset(volatkhld), 0}, /* env2 attack */
54 {PARM_BYTE_HI, 0, 0x7e, parm_offset(volatkhld), 0}, /* env2 hold */
55 {PARM_BYTE_LO, 1, 0x7f, parm_offset(voldcysus), 0}, /* env2 decay */
56 {PARM_BYTE_LO, 1, 0x7f, parm_offset(volrelease), 0}, /* env2 release */
57 {PARM_BYTE_HI, 0, 0x7f, parm_offset(voldcysus), 0}, /* env2 sustain */
58
59 {PARM_WORD, 0, 0x8000, parm_offset(lfo1delay), 0}, /* lfo1 delay */
60 {PARM_BYTE_LO, 0, 0xff, parm_offset(tremfrq), SNDRV_EMUX_UPDATE_TREMFREQ}, /* lfo1 freq */
61 {PARM_SIGN_HI, -128, 127, parm_offset(tremfrq), SNDRV_EMUX_UPDATE_TREMFREQ}, /* lfo1 vol */
62 {PARM_SIGN_HI, -128, 127, parm_offset(fmmod), SNDRV_EMUX_UPDATE_FMMOD}, /* lfo1 pitch */
63 {PARM_BYTE_LO, 0, 0xff, parm_offset(fmmod), SNDRV_EMUX_UPDATE_FMMOD}, /* lfo1 cutoff */
64
65 {PARM_WORD, 0, 0x8000, parm_offset(lfo2delay), 0}, /* lfo2 delay */
66 {PARM_BYTE_LO, 0, 0xff, parm_offset(fm2frq2), SNDRV_EMUX_UPDATE_FM2FRQ2}, /* lfo2 freq */
67 {PARM_SIGN_HI, -128, 127, parm_offset(fm2frq2), SNDRV_EMUX_UPDATE_FM2FRQ2}, /* lfo2 pitch */
68
69 {PARM_WORD, 0, 0xffff, -1, SNDRV_EMUX_UPDATE_PITCH}, /* initial pitch */
70 {PARM_BYTE, 0, 0xff, parm_offset(chorus), 0}, /* chorus */
71 {PARM_BYTE, 0, 0xff, parm_offset(reverb), 0}, /* reverb */
72 {PARM_BYTE, 0, 0xff, parm_offset(cutoff), SNDRV_EMUX_UPDATE_VOLUME}, /* cutoff */
73 {PARM_BYTE, 0, 15, parm_offset(filterQ), SNDRV_EMUX_UPDATE_Q}, /* resonance */
74
75 {PARM_WORD, 0, 0xffff, -1, 0}, /* sample start */
76 {PARM_WORD, 0, 0xffff, -1, 0}, /* loop start */
77 {PARM_WORD, 0, 0xffff, -1, 0}, /* loop end */
78 {PARM_WORD, 0, 0xffff, -1, 0}, /* coarse sample start */
79 {PARM_WORD, 0, 0xffff, -1, 0}, /* coarse loop start */
80 {PARM_WORD, 0, 0xffff, -1, 0}, /* coarse loop end */
81 {PARM_BYTE, 0, 0xff, -1, SNDRV_EMUX_UPDATE_VOLUME}, /* initial attenuation */
82};
83
84/* set byte effect value */
85static void
86effect_set_byte(unsigned char *valp, struct snd_midi_channel *chan, int type)
87{
88 short effect;
89 struct snd_emux_effect_table *fx = chan->private;
90
91 effect = fx->val[type];
92 if (fx->flag[type] == EMUX_FX_FLAG_ADD) {
93 if (parm_defs[type].type & PARM_IS_SIGNED)
94 effect += *(char*)valp;
95 else
96 effect += *valp;
97 }
98 if (effect < parm_defs[type].low)
99 effect = parm_defs[type].low;
100 else if (effect > parm_defs[type].high)
101 effect = parm_defs[type].high;
102 *valp = (unsigned char)effect;
103}
104
105/* set word effect value */
106static void
107effect_set_word(unsigned short *valp, struct snd_midi_channel *chan, int type)
108{
109 int effect;
110 struct snd_emux_effect_table *fx = chan->private;
111
112 effect = *(unsigned short*)&fx->val[type];
113 if (fx->flag[type] == EMUX_FX_FLAG_ADD)
114 effect += *valp;
115 if (effect < parm_defs[type].low)
116 effect = parm_defs[type].low;
117 else if (effect > parm_defs[type].high)
118 effect = parm_defs[type].high;
119 *valp = (unsigned short)effect;
120}
121
122/* address offset */
123static int
124effect_get_offset(struct snd_midi_channel *chan, int lo, int hi, int mode)
125{
126 int addr = 0;
127 struct snd_emux_effect_table *fx = chan->private;
128
129 if (fx->flag[hi])
130 addr = (short)fx->val[hi];
131 addr = addr << 15;
132 if (fx->flag[lo])
133 addr += (short)fx->val[lo];
134 if (!(mode & SNDRV_SFNT_SAMPLE_8BITS))
135 addr /= 2;
136 return addr;
137}
138
139#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
140/* change effects - for OSS sequencer compatibility */
141void
142snd_emux_send_effect_oss(struct snd_emux_port *port,
143 struct snd_midi_channel *chan, int type, int val)
144{
145 int mode;
146
147 if (type & 0x40)
148 mode = EMUX_FX_FLAG_OFF;
149 else if (type & 0x80)
150 mode = EMUX_FX_FLAG_ADD;
151 else
152 mode = EMUX_FX_FLAG_SET;
153 type &= 0x3f;
154
155 snd_emux_send_effect(port, chan, type, val, mode);
156}
157#endif
158
159/* Modify the effect value.
160 * if update is necessary, call emu8000_control
161 */
162void
163snd_emux_send_effect(struct snd_emux_port *port, struct snd_midi_channel *chan,
164 int type, int val, int mode)
165{
166 int i;
167 int offset;
168 unsigned char *srcp, *origp;
169 struct snd_emux *emu;
170 struct snd_emux_effect_table *fx;
171
172 emu = port->emu;
173 fx = chan->private;
174 if (emu == NULL || fx == NULL)
175 return;
176 if (type < 0 || type >= EMUX_NUM_EFFECTS)
177 return;
178
179 fx->val[type] = val;
180 fx->flag[type] = mode;
181
182 /* do we need to modify the register in realtime ? */
183 if (!parm_defs[type].update)
184 return;
185 offset = parm_defs[type].offset;
186 if (offset < 0)
187 return;
188
189#ifdef SNDRV_LITTLE_ENDIAN
190 if (parm_defs[type].type & PARM_IS_ALIGN_HI)
191 offset++;
192#else
193 if (parm_defs[type].type & PARM_IS_ALIGN_LO)
194 offset++;
195#endif
196 /* modify the register values */
197 scoped_guard(spinlock_irqsave, &emu->voice_lock) {
198 for (i = 0; i < emu->max_voices; i++) {
199 struct snd_emux_voice *vp = &emu->voices[i];
200 if (!STATE_IS_PLAYING(vp->state) || vp->chan != chan)
201 continue;
202 srcp = (unsigned char *)&vp->reg.parm + offset;
203 origp = (unsigned char *)&vp->zone->v.parm + offset;
204 if (parm_defs[i].type & PARM_IS_BYTE) {
205 *srcp = *origp;
206 effect_set_byte(valp: srcp, chan, type);
207 } else {
208 *(unsigned short *)srcp = *(unsigned short *)origp;
209 effect_set_word(valp: (unsigned short *)srcp, chan, type);
210 }
211 }
212 }
213
214 /* activate them */
215 snd_emux_update_channel(port, chan, update: parm_defs[type].update);
216}
217
218
219/* copy wavetable registers to voice table */
220void
221snd_emux_setup_effect(struct snd_emux_voice *vp)
222{
223 struct snd_midi_channel *chan = vp->chan;
224 struct snd_emux_effect_table *fx;
225 unsigned char *srcp;
226 int i;
227
228 fx = chan->private;
229 if (!fx)
230 return;
231
232 /* modify the register values via effect table */
233 for (i = 0; i < EMUX_FX_END; i++) {
234 int offset;
235 if (!fx->flag[i])
236 continue;
237 offset = parm_defs[i].offset;
238 if (offset < 0)
239 continue;
240#ifdef SNDRV_LITTLE_ENDIAN
241 if (parm_defs[i].type & PARM_IS_ALIGN_HI)
242 offset++;
243#else
244 if (parm_defs[i].type & PARM_IS_ALIGN_LO)
245 offset++;
246#endif
247 srcp = (unsigned char*)&vp->reg.parm + offset;
248 if (parm_defs[i].type & PARM_IS_BYTE)
249 effect_set_byte(valp: srcp, chan, type: i);
250 else
251 effect_set_word(valp: (unsigned short*)srcp, chan, type: i);
252 }
253
254 /* correct sample and loop points */
255 vp->reg.start += effect_get_offset(chan, lo: EMUX_FX_SAMPLE_START,
256 hi: EMUX_FX_COARSE_SAMPLE_START,
257 mode: vp->reg.sample_mode);
258
259 vp->reg.loopstart += effect_get_offset(chan, lo: EMUX_FX_LOOP_START,
260 hi: EMUX_FX_COARSE_LOOP_START,
261 mode: vp->reg.sample_mode);
262
263 vp->reg.loopend += effect_get_offset(chan, lo: EMUX_FX_LOOP_END,
264 hi: EMUX_FX_COARSE_LOOP_END,
265 mode: vp->reg.sample_mode);
266}
267
268/*
269 * effect table
270 */
271void
272snd_emux_create_effect(struct snd_emux_port *p)
273{
274 int i;
275 p->effect = kcalloc(p->chset.max_channels,
276 sizeof(struct snd_emux_effect_table), GFP_KERNEL);
277 if (p->effect) {
278 for (i = 0; i < p->chset.max_channels; i++)
279 p->chset.channels[i].private = p->effect + i;
280 } else {
281 for (i = 0; i < p->chset.max_channels; i++)
282 p->chset.channels[i].private = NULL;
283 }
284}
285
286void
287snd_emux_delete_effect(struct snd_emux_port *p)
288{
289 kfree(objp: p->effect);
290 p->effect = NULL;
291}
292
293void
294snd_emux_clear_effect(struct snd_emux_port *p)
295{
296 if (p->effect) {
297 memset(p->effect, 0, sizeof(struct snd_emux_effect_table) *
298 p->chset.max_channels);
299 }
300}
301
302#endif /* SNDRV_EMUX_USE_RAW_EFFECT */
303

source code of linux/sound/synth/emux/emux_effect.c