3 * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
4 * Jaroslav Kysela <perex@suse.cz>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <sound/driver.h>
24 #include <sound/core.h>
25 #include <linux/slab.h>
26 #include "seq_timer.h"
27 #include "seq_queue.h"
30 extern int seq_default_timer_class;
31 extern int seq_default_timer_sclass;
32 extern int seq_default_timer_card;
33 extern int seq_default_timer_device;
34 extern int seq_default_timer_subdevice;
35 extern int seq_default_timer_resolution;
37 #define SKEW_BASE 0x10000 /* 16bit shift */
39 static void snd_seq_timer_set_tick_resolution(seq_timer_tick_t *tick,
40 int tempo, int ppq, int nticks)
43 tick->resolution = (tempo * 1000) / ppq;
45 /* might overflow.. */
49 tick->resolution = (tempo / ppq) * 1000;
50 tick->resolution += s;
52 if (tick->resolution <= 0)
54 tick->resolution *= nticks;
55 snd_seq_timer_update_tick(tick, 0);
58 /* create new timer (constructor) */
59 seq_timer_t *snd_seq_timer_new(void)
63 tmr = kzalloc(sizeof(*tmr), GFP_KERNEL);
65 snd_printd("malloc failed for snd_seq_timer_new() \n");
68 spin_lock_init(&tmr->lock);
70 /* reset setup to defaults */
71 snd_seq_timer_defaults(tmr);
74 snd_seq_timer_reset(tmr);
79 /* delete timer (destructor) */
80 void snd_seq_timer_delete(seq_timer_t **tmr)
82 seq_timer_t *t = *tmr;
86 snd_printd("oops: snd_seq_timer_delete() called with NULL timer\n");
92 snd_seq_timer_stop(t);
93 snd_seq_timer_reset(t);
98 void snd_seq_timer_defaults(seq_timer_t * tmr)
101 tmr->ppq = 96; /* 96 PPQ */
102 tmr->tempo = 500000; /* 120 BPM */
103 snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq, 1);
106 tmr->type = SNDRV_SEQ_TIMER_ALSA;
107 tmr->alsa_id.dev_class = seq_default_timer_class;
108 tmr->alsa_id.dev_sclass = seq_default_timer_sclass;
109 tmr->alsa_id.card = seq_default_timer_card;
110 tmr->alsa_id.device = seq_default_timer_device;
111 tmr->alsa_id.subdevice = seq_default_timer_subdevice;
112 tmr->preferred_resolution = seq_default_timer_resolution;
114 tmr->skew = tmr->skew_base = SKEW_BASE;
117 void snd_seq_timer_reset(seq_timer_t * tmr)
121 spin_lock_irqsave(&tmr->lock, flags);
123 /* reset time & songposition */
124 tmr->cur_time.tv_sec = 0;
125 tmr->cur_time.tv_nsec = 0;
127 tmr->tick.cur_tick = 0;
128 tmr->tick.fraction = 0;
130 spin_unlock_irqrestore(&tmr->lock, flags);
134 /* called by timer interrupt routine. the period time since previous invocation is passed */
135 static void snd_seq_timer_interrupt(snd_timer_instance_t *timeri,
136 unsigned long resolution,
140 queue_t *q = (queue_t *)timeri->callback_data;
152 if (tmr->skew != tmr->skew_base) {
153 /* FIXME: assuming skew_base = 0x10000 */
154 resolution = (resolution >> 16) * tmr->skew +
155 (((resolution & 0xffff) * tmr->skew) >> 16);
158 spin_lock_irqsave(&tmr->lock, flags);
161 snd_seq_inc_time_nsec(&tmr->cur_time, resolution);
163 /* calculate current tick */
164 snd_seq_timer_update_tick(&tmr->tick, resolution);
166 /* register actual time of this timer update */
167 do_gettimeofday(&tmr->last_update);
169 spin_unlock_irqrestore(&tmr->lock, flags);
171 /* check queues and dispatch events */
172 snd_seq_check_queue(q, 1, 0);
175 /* set current tempo */
176 int snd_seq_timer_set_tempo(seq_timer_t * tmr, int tempo)
180 snd_assert(tmr, return -EINVAL);
183 spin_lock_irqsave(&tmr->lock, flags);
184 if ((unsigned int)tempo != tmr->tempo) {
186 snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq, 1);
188 spin_unlock_irqrestore(&tmr->lock, flags);
192 /* set current ppq */
193 int snd_seq_timer_set_ppq(seq_timer_t * tmr, int ppq)
197 snd_assert(tmr, return -EINVAL);
200 spin_lock_irqsave(&tmr->lock, flags);
201 if (tmr->running && (ppq != tmr->ppq)) {
202 /* refuse to change ppq on running timers */
203 /* because it will upset the song position (ticks) */
204 spin_unlock_irqrestore(&tmr->lock, flags);
205 snd_printd("seq: cannot change ppq of a running timer\n");
210 snd_seq_timer_set_tick_resolution(&tmr->tick, tmr->tempo, tmr->ppq, 1);
211 spin_unlock_irqrestore(&tmr->lock, flags);
215 /* set current tick position */
216 int snd_seq_timer_set_position_tick(seq_timer_t *tmr, snd_seq_tick_time_t position)
220 snd_assert(tmr, return -EINVAL);
222 spin_lock_irqsave(&tmr->lock, flags);
223 tmr->tick.cur_tick = position;
224 tmr->tick.fraction = 0;
225 spin_unlock_irqrestore(&tmr->lock, flags);
229 /* set current real-time position */
230 int snd_seq_timer_set_position_time(seq_timer_t *tmr, snd_seq_real_time_t position)
234 snd_assert(tmr, return -EINVAL);
236 snd_seq_sanity_real_time(&position);
237 spin_lock_irqsave(&tmr->lock, flags);
238 tmr->cur_time = position;
239 spin_unlock_irqrestore(&tmr->lock, flags);
244 int snd_seq_timer_set_skew(seq_timer_t *tmr, unsigned int skew, unsigned int base)
248 snd_assert(tmr, return -EINVAL);
251 if (base != SKEW_BASE) {
252 snd_printd("invalid skew base 0x%x\n", base);
255 spin_lock_irqsave(&tmr->lock, flags);
257 spin_unlock_irqrestore(&tmr->lock, flags);
261 int snd_seq_timer_open(queue_t *q)
263 snd_timer_instance_t *t;
269 snd_assert(tmr != NULL, return -EINVAL);
272 sprintf(str, "sequencer queue %i", q->queue);
273 if (tmr->type != SNDRV_SEQ_TIMER_ALSA) /* standard ALSA timer */
275 if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
276 tmr->alsa_id.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
277 err = snd_timer_open(&t, str, &tmr->alsa_id, q->queue);
278 if (err < 0 && tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_SLAVE) {
279 if (tmr->alsa_id.dev_class != SNDRV_TIMER_CLASS_GLOBAL ||
280 tmr->alsa_id.device != SNDRV_TIMER_GLOBAL_SYSTEM) {
282 memset(&tid, 0, sizeof(tid));
283 tid.dev_class = SNDRV_TIMER_CLASS_GLOBAL;
284 tid.dev_sclass = SNDRV_TIMER_SCLASS_SEQUENCER;
286 tid.device = SNDRV_TIMER_GLOBAL_SYSTEM;
287 err = snd_timer_open(&t, str, &tid, q->queue);
290 snd_printk(KERN_ERR "seq fatal error: cannot create timer (%i)\n", err);
294 t->callback = snd_seq_timer_interrupt;
295 t->callback_data = q;
296 t->flags |= SNDRV_TIMER_IFLG_AUTO;
301 int snd_seq_timer_close(queue_t *q)
306 snd_assert(tmr != NULL, return -EINVAL);
308 snd_timer_stop(tmr->timeri);
309 snd_timer_close(tmr->timeri);
315 int snd_seq_timer_stop(seq_timer_t * tmr)
322 snd_timer_pause(tmr->timeri);
326 static int initialize_timer(seq_timer_t *tmr)
329 t = tmr->timeri->timer;
330 snd_assert(t, return -EINVAL);
333 if (tmr->preferred_resolution &&
334 ! (t->hw.flags & SNDRV_TIMER_HW_SLAVE)) {
335 unsigned long r = t->hw.resolution;
336 if (! r && t->hw.c_resolution)
337 r = t->hw.c_resolution(t);
339 tmr->ticks = (unsigned int)(1000000000uL / (r * tmr->preferred_resolution));
344 tmr->initialized = 1;
348 int snd_seq_timer_start(seq_timer_t * tmr)
353 snd_seq_timer_stop(tmr);
354 snd_seq_timer_reset(tmr);
355 if (initialize_timer(tmr) < 0)
357 snd_timer_start(tmr->timeri, tmr->ticks);
359 do_gettimeofday(&tmr->last_update);
363 int snd_seq_timer_continue(seq_timer_t * tmr)
369 if (! tmr->initialized) {
370 snd_seq_timer_reset(tmr);
371 if (initialize_timer(tmr) < 0)
374 snd_timer_start(tmr->timeri, tmr->ticks);
376 do_gettimeofday(&tmr->last_update);
380 /* return current 'real' time. use timeofday() to get better granularity. */
381 snd_seq_real_time_t snd_seq_timer_get_cur_time(seq_timer_t *tmr)
383 snd_seq_real_time_t cur_time;
385 cur_time = tmr->cur_time;
389 do_gettimeofday(&tm);
390 usec = (int)(tm.tv_usec - tmr->last_update.tv_usec);
392 cur_time.tv_nsec += (1000000 + usec) * 1000;
393 cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec - 1;
395 cur_time.tv_nsec += usec * 1000;
396 cur_time.tv_sec += tm.tv_sec - tmr->last_update.tv_sec;
398 snd_seq_sanity_real_time(&cur_time);
404 /* TODO: use interpolation on tick queue (will only be useful for very
406 snd_seq_tick_time_t snd_seq_timer_get_cur_tick(seq_timer_t *tmr)
408 return tmr->tick.cur_tick;
412 /* exported to seq_info.c */
413 void snd_seq_info_timer_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
418 snd_timer_instance_t *ti;
419 unsigned long resolution;
421 for (idx = 0; idx < SNDRV_SEQ_MAX_QUEUES; idx++) {
425 if ((tmr = q->timer) == NULL ||
426 (ti = tmr->timeri) == NULL) {
430 snd_iprintf(buffer, "Timer for queue %i : %s\n", q->queue, ti->timer->name);
431 resolution = snd_timer_resolution(ti) * tmr->ticks;
432 snd_iprintf(buffer, " Period time : %lu.%09lu\n", resolution / 1000000000, resolution % 1000000000);
433 snd_iprintf(buffer, " Skew : %u / %u\n", tmr->skew, tmr->skew_base);