1/*
2 *  Midi synth routines for the Emu8k/Emu10k1
3 *
4 *  Copyright (C) 1999 Steve Ratcliffe
5 *  Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
6 *
7 *  Contains code based on awe_wave.c by Takashi Iwai
8 *
9 *   This program is free software; you can redistribute it and/or modify
10 *   it under the terms of the GNU General Public License as published by
11 *   the Free Software Foundation; either version 2 of the License, or
12 *   (at your option) any later version.
13 *
14 *   This program is distributed in the hope that it will be useful,
15 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 *   GNU General Public License for more details.
18 *
19 *   You should have received a copy of the GNU General Public License
20 *   along with this program; if not, write to the Free Software
21 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
22 *
23 */
24
25#include "emux_voice.h"
26#include <linux/slab.h>
27
28#ifdef SNDRV_EMUX_USE_RAW_EFFECT
29/*
30 * effects table
31 */
32
33#define xoffsetof(type,tag)	((long)(&((type)NULL)->tag) - (long)(NULL))
34
35#define parm_offset(tag)	xoffsetof(struct soundfont_voice_parm *, tag)
36
37#define PARM_IS_BYTE		(1 << 0)
38#define PARM_IS_WORD		(1 << 1)
39#define PARM_IS_ALIGNED		(3 << 2)
40#define PARM_IS_ALIGN_HI	(1 << 2)
41#define PARM_IS_ALIGN_LO	(2 << 2)
42#define PARM_IS_SIGNED		(1 << 4)
43
44#define PARM_WORD	(PARM_IS_WORD)
45#define PARM_BYTE_LO	(PARM_IS_BYTE|PARM_IS_ALIGN_LO)
46#define PARM_BYTE_HI	(PARM_IS_BYTE|PARM_IS_ALIGN_HI)
47#define PARM_BYTE	(PARM_IS_BYTE)
48#define PARM_SIGN_LO	(PARM_IS_BYTE|PARM_IS_ALIGN_LO|PARM_IS_SIGNED)
49#define PARM_SIGN_HI	(PARM_IS_BYTE|PARM_IS_ALIGN_HI|PARM_IS_SIGNED)
50
51static struct emux_parm_defs {
52	int type;	/* byte or word */
53	int low, high;	/* value range */
54	long offset;	/* offset in parameter record (-1 = not written) */
55	int update;	/* flgas for real-time update */
56} parm_defs[EMUX_NUM_EFFECTS] = {
57	{PARM_WORD, 0, 0x8000, parm_offset(moddelay), 0},	/* env1 delay */
58	{PARM_BYTE_LO, 1, 0x80, parm_offset(modatkhld), 0},	/* env1 attack */
59	{PARM_BYTE_HI, 0, 0x7e, parm_offset(modatkhld), 0},	/* env1 hold */
60	{PARM_BYTE_LO, 1, 0x7f, parm_offset(moddcysus), 0},	/* env1 decay */
61	{PARM_BYTE_LO, 1, 0x7f, parm_offset(modrelease), 0},	/* env1 release */
62	{PARM_BYTE_HI, 0, 0x7f, parm_offset(moddcysus), 0},	/* env1 sustain */
63	{PARM_BYTE_HI, 0, 0xff, parm_offset(pefe), 0},	/* env1 pitch */
64	{PARM_BYTE_LO, 0, 0xff, parm_offset(pefe), 0},	/* env1 fc */
65
66	{PARM_WORD, 0, 0x8000, parm_offset(voldelay), 0},	/* env2 delay */
67	{PARM_BYTE_LO, 1, 0x80, parm_offset(volatkhld), 0},	/* env2 attack */
68	{PARM_BYTE_HI, 0, 0x7e, parm_offset(volatkhld), 0},	/* env2 hold */
69	{PARM_BYTE_LO, 1, 0x7f, parm_offset(voldcysus), 0},	/* env2 decay */
70	{PARM_BYTE_LO, 1, 0x7f, parm_offset(volrelease), 0},	/* env2 release */
71	{PARM_BYTE_HI, 0, 0x7f, parm_offset(voldcysus), 0},	/* env2 sustain */
72
73	{PARM_WORD, 0, 0x8000, parm_offset(lfo1delay), 0},	/* lfo1 delay */
74	{PARM_BYTE_LO, 0, 0xff, parm_offset(tremfrq), SNDRV_EMUX_UPDATE_TREMFREQ},	/* lfo1 freq */
75	{PARM_SIGN_HI, -128, 127, parm_offset(tremfrq), SNDRV_EMUX_UPDATE_TREMFREQ},	/* lfo1 vol */
76	{PARM_SIGN_HI, -128, 127, parm_offset(fmmod), SNDRV_EMUX_UPDATE_FMMOD},	/* lfo1 pitch */
77	{PARM_BYTE_LO, 0, 0xff, parm_offset(fmmod), SNDRV_EMUX_UPDATE_FMMOD},	/* lfo1 cutoff */
78
79	{PARM_WORD, 0, 0x8000, parm_offset(lfo2delay), 0},	/* lfo2 delay */
80	{PARM_BYTE_LO, 0, 0xff, parm_offset(fm2frq2), SNDRV_EMUX_UPDATE_FM2FRQ2},	/* lfo2 freq */
81	{PARM_SIGN_HI, -128, 127, parm_offset(fm2frq2), SNDRV_EMUX_UPDATE_FM2FRQ2},	/* lfo2 pitch */
82
83	{PARM_WORD, 0, 0xffff, -1, SNDRV_EMUX_UPDATE_PITCH},	/* initial pitch */
84	{PARM_BYTE, 0, 0xff, parm_offset(chorus), 0},	/* chorus */
85	{PARM_BYTE, 0, 0xff, parm_offset(reverb), 0},	/* reverb */
86	{PARM_BYTE, 0, 0xff, parm_offset(cutoff), SNDRV_EMUX_UPDATE_VOLUME},	/* cutoff */
87	{PARM_BYTE, 0, 15, parm_offset(filterQ), SNDRV_EMUX_UPDATE_Q},	/* resonance */
88
89	{PARM_WORD, 0, 0xffff, -1, 0},	/* sample start */
90	{PARM_WORD, 0, 0xffff, -1, 0},	/* loop start */
91	{PARM_WORD, 0, 0xffff, -1, 0},	/* loop end */
92	{PARM_WORD, 0, 0xffff, -1, 0},	/* coarse sample start */
93	{PARM_WORD, 0, 0xffff, -1, 0},	/* coarse loop start */
94	{PARM_WORD, 0, 0xffff, -1, 0},	/* coarse loop end */
95	{PARM_BYTE, 0, 0xff, -1, SNDRV_EMUX_UPDATE_VOLUME},	/* initial attenuation */
96};
97
98/* set byte effect value */
99static void
100effect_set_byte(unsigned char *valp, struct snd_midi_channel *chan, int type)
101{
102	short effect;
103	struct snd_emux_effect_table *fx = chan->private;
104
105	effect = fx->val[type];
106	if (fx->flag[type] == EMUX_FX_FLAG_ADD) {
107		if (parm_defs[type].type & PARM_IS_SIGNED)
108			effect += *(char*)valp;
109		else
110			effect += *valp;
111	}
112	if (effect < parm_defs[type].low)
113		effect = parm_defs[type].low;
114	else if (effect > parm_defs[type].high)
115		effect = parm_defs[type].high;
116	*valp = (unsigned char)effect;
117}
118
119/* set word effect value */
120static void
121effect_set_word(unsigned short *valp, struct snd_midi_channel *chan, int type)
122{
123	int effect;
124	struct snd_emux_effect_table *fx = chan->private;
125
126	effect = *(unsigned short*)&fx->val[type];
127	if (fx->flag[type] == EMUX_FX_FLAG_ADD)
128		effect += *valp;
129	if (effect < parm_defs[type].low)
130		effect = parm_defs[type].low;
131	else if (effect > parm_defs[type].high)
132		effect = parm_defs[type].high;
133	*valp = (unsigned short)effect;
134}
135
136/* address offset */
137static int
138effect_get_offset(struct snd_midi_channel *chan, int lo, int hi, int mode)
139{
140	int addr = 0;
141	struct snd_emux_effect_table *fx = chan->private;
142
143	if (fx->flag[hi])
144		addr = (short)fx->val[hi];
145	addr = addr << 15;
146	if (fx->flag[lo])
147		addr += (short)fx->val[lo];
148	if (!(mode & SNDRV_SFNT_SAMPLE_8BITS))
149		addr /= 2;
150	return addr;
151}
152
153#ifdef CONFIG_SND_SEQUENCER_OSS
154/* change effects - for OSS sequencer compatibility */
155void
156snd_emux_send_effect_oss(struct snd_emux_port *port,
157			 struct snd_midi_channel *chan, int type, int val)
158{
159	int mode;
160
161	if (type & 0x40)
162		mode = EMUX_FX_FLAG_OFF;
163	else if (type & 0x80)
164		mode = EMUX_FX_FLAG_ADD;
165	else
166		mode = EMUX_FX_FLAG_SET;
167	type &= 0x3f;
168
169	snd_emux_send_effect(port, chan, type, val, mode);
170}
171#endif
172
173/* Modify the effect value.
174 * if update is necessary, call emu8000_control
175 */
176void
177snd_emux_send_effect(struct snd_emux_port *port, struct snd_midi_channel *chan,
178		     int type, int val, int mode)
179{
180	int i;
181	int offset;
182	unsigned char *srcp, *origp;
183	struct snd_emux *emu;
184	struct snd_emux_effect_table *fx;
185	unsigned long flags;
186
187	emu = port->emu;
188	fx = chan->private;
189	if (emu == NULL || fx == NULL)
190		return;
191	if (type < 0 || type >= EMUX_NUM_EFFECTS)
192		return;
193
194	fx->val[type] = val;
195	fx->flag[type] = mode;
196
197	/* do we need to modify the register in realtime ? */
198	if (! parm_defs[type].update || (offset = parm_defs[type].offset) < 0)
199		return;
200
201#ifdef SNDRV_LITTLE_ENDIAN
202	if (parm_defs[type].type & PARM_IS_ALIGN_HI)
203		offset++;
204#else
205	if (parm_defs[type].type & PARM_IS_ALIGN_LO)
206		offset++;
207#endif
208	/* modify the register values */
209	spin_lock_irqsave(&emu->voice_lock, flags);
210	for (i = 0; i < emu->max_voices; i++) {
211		struct snd_emux_voice *vp = &emu->voices[i];
212		if (!STATE_IS_PLAYING(vp->state) || vp->chan != chan)
213			continue;
214		srcp = (unsigned char*)&vp->reg.parm + offset;
215		origp = (unsigned char*)&vp->zone->v.parm + offset;
216		if (parm_defs[i].type & PARM_IS_BYTE) {
217			*srcp = *origp;
218			effect_set_byte(srcp, chan, type);
219		} else {
220			*(unsigned short*)srcp = *(unsigned short*)origp;
221			effect_set_word((unsigned short*)srcp, chan, type);
222		}
223	}
224	spin_unlock_irqrestore(&emu->voice_lock, flags);
225
226	/* activate them */
227	snd_emux_update_channel(port, chan, parm_defs[type].update);
228}
229
230
231/* copy wavetable registers to voice table */
232void
233snd_emux_setup_effect(struct snd_emux_voice *vp)
234{
235	struct snd_midi_channel *chan = vp->chan;
236	struct snd_emux_effect_table *fx;
237	unsigned char *srcp;
238	int i;
239
240	if (! (fx = chan->private))
241		return;
242
243	/* modify the register values via effect table */
244	for (i = 0; i < EMUX_FX_END; i++) {
245		int offset;
246		if (! fx->flag[i] || (offset = parm_defs[i].offset) < 0)
247			continue;
248#ifdef SNDRV_LITTLE_ENDIAN
249		if (parm_defs[i].type & PARM_IS_ALIGN_HI)
250			offset++;
251#else
252		if (parm_defs[i].type & PARM_IS_ALIGN_LO)
253			offset++;
254#endif
255		srcp = (unsigned char*)&vp->reg.parm + offset;
256		if (parm_defs[i].type & PARM_IS_BYTE)
257			effect_set_byte(srcp, chan, i);
258		else
259			effect_set_word((unsigned short*)srcp, chan, i);
260	}
261
262	/* correct sample and loop points */
263	vp->reg.start += effect_get_offset(chan, EMUX_FX_SAMPLE_START,
264					   EMUX_FX_COARSE_SAMPLE_START,
265					   vp->reg.sample_mode);
266
267	vp->reg.loopstart += effect_get_offset(chan, EMUX_FX_LOOP_START,
268					       EMUX_FX_COARSE_LOOP_START,
269					       vp->reg.sample_mode);
270
271	vp->reg.loopend += effect_get_offset(chan, EMUX_FX_LOOP_END,
272					     EMUX_FX_COARSE_LOOP_END,
273					     vp->reg.sample_mode);
274}
275
276/*
277 * effect table
278 */
279void
280snd_emux_create_effect(struct snd_emux_port *p)
281{
282	int i;
283	p->effect = kcalloc(p->chset.max_channels,
284			    sizeof(struct snd_emux_effect_table), GFP_KERNEL);
285	if (p->effect) {
286		for (i = 0; i < p->chset.max_channels; i++)
287			p->chset.channels[i].private = p->effect + i;
288	} else {
289		for (i = 0; i < p->chset.max_channels; i++)
290			p->chset.channels[i].private = NULL;
291	}
292}
293
294void
295snd_emux_delete_effect(struct snd_emux_port *p)
296{
297	kfree(p->effect);
298	p->effect = NULL;
299}
300
301void
302snd_emux_clear_effect(struct snd_emux_port *p)
303{
304	if (p->effect) {
305		memset(p->effect, 0, sizeof(struct snd_emux_effect_table) *
306		       p->chset.max_channels);
307	}
308}
309
310#endif /* SNDRV_EMUX_USE_RAW_EFFECT */
311