tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * OSS compatible sequencer driver
3 *
4 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include "seq_oss_device.h"
22#include "seq_oss_synth.h"
23#include "seq_oss_midi.h"
24#include "seq_oss_event.h"
25#include "seq_oss_timer.h"
26#include <sound/seq_oss_legacy.h>
27#include "seq_oss_readq.h"
28#include "seq_oss_writeq.h"
29
30
31/*
32 * prototypes
33 */
34static int extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev);
35static int chn_voice_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
36static int chn_common_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
37static int timing_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
38static int local_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
39static int old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev);
40static int note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev);
41static int note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev);
42static int set_note_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int note, int vel, struct snd_seq_event *ev);
43static int set_control_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int param, int val, struct snd_seq_event *ev);
44static int set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev);
45
46
47/*
48 * convert an OSS event to ALSA event
49 * return 0 : enqueued
50 * non-zero : invalid - ignored
51 */
52
53int
54snd_seq_oss_process_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
55{
56 switch (q->s.code) {
57 case SEQ_EXTENDED:
58 return extended_event(dp, q, ev);
59
60 case EV_CHN_VOICE:
61 return chn_voice_event(dp, q, ev);
62
63 case EV_CHN_COMMON:
64 return chn_common_event(dp, q, ev);
65
66 case EV_TIMING:
67 return timing_event(dp, q, ev);
68
69 case EV_SEQ_LOCAL:
70 return local_event(dp, q, ev);
71
72 case EV_SYSEX:
73 return snd_seq_oss_synth_sysex(dp, q->x.dev, q->x.buf, ev);
74
75 case SEQ_MIDIPUTC:
76 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
77 return -EINVAL;
78 /* put a midi byte */
79 if (! is_write_mode(dp->file_mode))
80 break;
81 if (snd_seq_oss_midi_open(dp, q->s.dev, SNDRV_SEQ_OSS_FILE_WRITE))
82 break;
83 if (snd_seq_oss_midi_filemode(dp, q->s.dev) & SNDRV_SEQ_OSS_FILE_WRITE)
84 return snd_seq_oss_midi_putc(dp, q->s.dev, q->s.parm1, ev);
85 break;
86
87 case SEQ_ECHO:
88 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
89 return -EINVAL;
90 return set_echo_event(dp, q, ev);
91
92 case SEQ_PRIVATE:
93 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
94 return -EINVAL;
95 return snd_seq_oss_synth_raw_event(dp, q->c[1], q->c, ev);
96
97 default:
98 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
99 return -EINVAL;
100 return old_event(dp, q, ev);
101 }
102 return -EINVAL;
103}
104
105/* old type events: mode1 only */
106static int
107old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
108{
109 switch (q->s.code) {
110 case SEQ_NOTEOFF:
111 return note_off_event(dp, 0, q->n.chn, q->n.note, q->n.vel, ev);
112
113 case SEQ_NOTEON:
114 return note_on_event(dp, 0, q->n.chn, q->n.note, q->n.vel, ev);
115
116 case SEQ_WAIT:
117 /* skip */
118 break;
119
120 case SEQ_PGMCHANGE:
121 return set_control_event(dp, 0, SNDRV_SEQ_EVENT_PGMCHANGE,
122 q->n.chn, 0, q->n.note, ev);
123
124 case SEQ_SYNCTIMER:
125 return snd_seq_oss_timer_reset(dp->timer);
126 }
127
128 return -EINVAL;
129}
130
131/* 8bytes extended event: mode1 only */
132static int
133extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
134{
135 int val;
136
137 switch (q->e.cmd) {
138 case SEQ_NOTEOFF:
139 return note_off_event(dp, q->e.dev, q->e.chn, q->e.p1, q->e.p2, ev);
140
141 case SEQ_NOTEON:
142 return note_on_event(dp, q->e.dev, q->e.chn, q->e.p1, q->e.p2, ev);
143
144 case SEQ_PGMCHANGE:
145 return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_PGMCHANGE,
146 q->e.chn, 0, q->e.p1, ev);
147
148 case SEQ_AFTERTOUCH:
149 return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_CHANPRESS,
150 q->e.chn, 0, q->e.p1, ev);
151
152 case SEQ_BALANCE:
153 /* convert -128:127 to 0:127 */
154 val = (char)q->e.p1;
155 val = (val + 128) / 2;
156 return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_CONTROLLER,
157 q->e.chn, CTL_PAN, val, ev);
158
159 case SEQ_CONTROLLER:
160 val = ((short)q->e.p3 << 8) | (short)q->e.p2;
161 switch (q->e.p1) {
162 case CTRL_PITCH_BENDER: /* SEQ1 V2 control */
163 /* -0x2000:0x1fff */
164 return set_control_event(dp, q->e.dev,
165 SNDRV_SEQ_EVENT_PITCHBEND,
166 q->e.chn, 0, val, ev);
167 case CTRL_PITCH_BENDER_RANGE:
168 /* conversion: 100/semitone -> 128/semitone */
169 return set_control_event(dp, q->e.dev,
170 SNDRV_SEQ_EVENT_REGPARAM,
171 q->e.chn, 0, val*128/100, ev);
172 default:
173 return set_control_event(dp, q->e.dev,
174 SNDRV_SEQ_EVENT_CONTROL14,
175 q->e.chn, q->e.p1, val, ev);
176 }
177
178 case SEQ_VOLMODE:
179 return snd_seq_oss_synth_raw_event(dp, q->e.dev, q->c, ev);
180
181 }
182 return -EINVAL;
183}
184
185/* channel voice events: mode1 and 2 */
186static int
187chn_voice_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
188{
189 if (q->v.chn >= 32)
190 return -EINVAL;
191 switch (q->v.cmd) {
192 case MIDI_NOTEON:
193 return note_on_event(dp, q->v.dev, q->v.chn, q->v.note, q->v.parm, ev);
194
195 case MIDI_NOTEOFF:
196 return note_off_event(dp, q->v.dev, q->v.chn, q->v.note, q->v.parm, ev);
197
198 case MIDI_KEY_PRESSURE:
199 return set_note_event(dp, q->v.dev, SNDRV_SEQ_EVENT_KEYPRESS,
200 q->v.chn, q->v.note, q->v.parm, ev);
201
202 }
203 return -EINVAL;
204}
205
206/* channel common events: mode1 and 2 */
207static int
208chn_common_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
209{
210 if (q->l.chn >= 32)
211 return -EINVAL;
212 switch (q->l.cmd) {
213 case MIDI_PGM_CHANGE:
214 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_PGMCHANGE,
215 q->l.chn, 0, q->l.p1, ev);
216
217 case MIDI_CTL_CHANGE:
218 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_CONTROLLER,
219 q->l.chn, q->l.p1, q->l.val, ev);
220
221 case MIDI_PITCH_BEND:
222 /* conversion: 0:0x3fff -> -0x2000:0x1fff */
223 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_PITCHBEND,
224 q->l.chn, 0, q->l.val - 8192, ev);
225
226 case MIDI_CHN_PRESSURE:
227 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_CHANPRESS,
228 q->l.chn, 0, q->l.val, ev);
229 }
230 return -EINVAL;
231}
232
233/* timer events: mode1 and mode2 */
234static int
235timing_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
236{
237 switch (q->t.cmd) {
238 case TMR_ECHO:
239 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
240 return set_echo_event(dp, q, ev);
241 else {
242 union evrec tmp;
243 memset(&tmp, 0, sizeof(tmp));
244 /* XXX: only for little-endian! */
245 tmp.echo = (q->t.time << 8) | SEQ_ECHO;
246 return set_echo_event(dp, &tmp, ev);
247 }
248
249 case TMR_STOP:
250 if (dp->seq_mode)
251 return snd_seq_oss_timer_stop(dp->timer);
252 return 0;
253
254 case TMR_CONTINUE:
255 if (dp->seq_mode)
256 return snd_seq_oss_timer_continue(dp->timer);
257 return 0;
258
259 case TMR_TEMPO:
260 if (dp->seq_mode)
261 return snd_seq_oss_timer_tempo(dp->timer, q->t.time);
262 return 0;
263 }
264
265 return -EINVAL;
266}
267
268/* local events: mode1 and 2 */
269static int
270local_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
271{
272 return -EINVAL;
273}
274
275/*
276 * process note-on event for OSS synth
277 * three different modes are available:
278 * - SNDRV_SEQ_OSS_PROCESS_EVENTS (for one-voice per channel mode)
279 * Accept note 255 as volume change.
280 * - SNDRV_SEQ_OSS_PASS_EVENTS
281 * Pass all events to lowlevel driver anyway
282 * - SNDRV_SEQ_OSS_PROCESS_KEYPRESS (mostly for Emu8000)
283 * Use key-pressure if note >= 128
284 */
285static int
286note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev)
287{
288 struct seq_oss_synthinfo *info = &dp->synths[dev];
289 switch (info->arg.event_passing) {
290 case SNDRV_SEQ_OSS_PROCESS_EVENTS:
291 if (! info->ch || ch < 0 || ch >= info->nr_voices) {
292 /* pass directly */
293 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
294 }
295
296 if (note == 255 && info->ch[ch].note >= 0) {
297 /* volume control */
298 int type;
299 //if (! vel)
300 /* set volume to zero -- note off */
301 // type = SNDRV_SEQ_EVENT_NOTEOFF;
302 //else
303 if (info->ch[ch].vel)
304 /* sample already started -- volume change */
305 type = SNDRV_SEQ_EVENT_KEYPRESS;
306 else
307 /* sample not started -- start now */
308 type = SNDRV_SEQ_EVENT_NOTEON;
309 info->ch[ch].vel = vel;
310 return set_note_event(dp, dev, type, ch, info->ch[ch].note, vel, ev);
311 } else if (note >= 128)
312 return -EINVAL; /* invalid */
313
314 if (note != info->ch[ch].note && info->ch[ch].note >= 0)
315 /* note changed - note off at beginning */
316 set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, info->ch[ch].note, 0, ev);
317 /* set current status */
318 info->ch[ch].note = note;
319 info->ch[ch].vel = vel;
320 if (vel) /* non-zero velocity - start the note now */
321 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
322 return -EINVAL;
323
324 case SNDRV_SEQ_OSS_PASS_EVENTS:
325 /* pass the event anyway */
326 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
327
328 case SNDRV_SEQ_OSS_PROCESS_KEYPRESS:
329 if (note >= 128) /* key pressure: shifted by 128 */
330 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_KEYPRESS, ch, note - 128, vel, ev);
331 else /* normal note-on event */
332 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
333 }
334 return -EINVAL;
335}
336
337/*
338 * process note-off event for OSS synth
339 */
340static int
341note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev)
342{
343 struct seq_oss_synthinfo *info = &dp->synths[dev];
344 switch (info->arg.event_passing) {
345 case SNDRV_SEQ_OSS_PROCESS_EVENTS:
346 if (! info->ch || ch < 0 || ch >= info->nr_voices) {
347 /* pass directly */
348 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
349 }
350
351 if (info->ch[ch].note >= 0) {
352 note = info->ch[ch].note;
353 info->ch[ch].vel = 0;
354 info->ch[ch].note = -1;
355 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, note, vel, ev);
356 }
357 return -EINVAL; /* invalid */
358
359 case SNDRV_SEQ_OSS_PASS_EVENTS:
360 case SNDRV_SEQ_OSS_PROCESS_KEYPRESS:
361 /* pass the event anyway */
362 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, note, vel, ev);
363
364 }
365 return -EINVAL;
366}
367
368/*
369 * create a note event
370 */
371static int
372set_note_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int note, int vel, struct snd_seq_event *ev)
373{
374 if (! snd_seq_oss_synth_is_valid(dp, dev))
375 return -ENXIO;
376
377 ev->type = type;
378 snd_seq_oss_synth_addr(dp, dev, ev);
379 ev->data.note.channel = ch;
380 ev->data.note.note = note;
381 ev->data.note.velocity = vel;
382
383 return 0;
384}
385
386/*
387 * create a control event
388 */
389static int
390set_control_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int param, int val, struct snd_seq_event *ev)
391{
392 if (! snd_seq_oss_synth_is_valid(dp, dev))
393 return -ENXIO;
394
395 ev->type = type;
396 snd_seq_oss_synth_addr(dp, dev, ev);
397 ev->data.control.channel = ch;
398 ev->data.control.param = param;
399 ev->data.control.value = val;
400
401 return 0;
402}
403
404/*
405 * create an echo event
406 */
407static int
408set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev)
409{
410 ev->type = SNDRV_SEQ_EVENT_ECHO;
411 /* echo back to itself */
412 snd_seq_oss_fill_addr(dp, ev, dp->addr.client, dp->addr.port);
413 memcpy(&ev->data, rec, LONG_EVENT_SIZE);
414 return 0;
415}
416
417/*
418 * event input callback from ALSA sequencer:
419 * the echo event is processed here.
420 */
421int
422snd_seq_oss_event_input(struct snd_seq_event *ev, int direct, void *private_data,
423 int atomic, int hop)
424{
425 struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private_data;
426 union evrec *rec;
427
428 if (ev->type != SNDRV_SEQ_EVENT_ECHO)
429 return snd_seq_oss_midi_input(ev, direct, private_data);
430
431 if (ev->source.client != dp->cseq)
432 return 0; /* ignored */
433
434 rec = (union evrec*)&ev->data;
435 if (rec->s.code == SEQ_SYNCTIMER) {
436 /* sync echo back */
437 snd_seq_oss_writeq_wakeup(dp->writeq, rec->t.time);
438
439 } else {
440 /* echo back event */
441 if (dp->readq == NULL)
442 return 0;
443 snd_seq_oss_readq_put_event(dp->readq, rec);
444 }
445 return 0;
446}
447