pcm_lib.c 67.1 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
/*
 *  Digital Audio (PCM) abstract layer
3
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds's avatar
Linus Torvalds committed
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 *                   Abramo Bagnara <abramo@alsa-project.org>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/slab.h>
24
#include <linux/sched/signal.h>
Linus Torvalds's avatar
Linus Torvalds committed
25
#include <linux/time.h>
26
#include <linux/math64.h>
27
#include <linux/export.h>
Linus Torvalds's avatar
Linus Torvalds committed
28
29
#include <sound/core.h>
#include <sound/control.h>
30
#include <sound/tlv.h>
Linus Torvalds's avatar
Linus Torvalds committed
31
32
33
34
35
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/timer.h>

36
37
#include "pcm_local.h"

38
39
40
41
42
43
44
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
#define CREATE_TRACE_POINTS
#include "pcm_trace.h"
#else
#define trace_hwptr(substream, pos, in_interrupt)
#define trace_xrun(substream)
#define trace_hw_ptr_error(substream, reason)
45
#define trace_applptr(substream, prev, curr)
46
47
#endif

48
49
50
static int fill_silence_frames(struct snd_pcm_substream *substream,
			       snd_pcm_uframes_t off, snd_pcm_uframes_t frames);

Linus Torvalds's avatar
Linus Torvalds committed
51
52
53
54
55
56
57
58
59
/*
 * fill ring buffer with silence
 * runtime->silence_start: starting pointer to silence area
 * runtime->silence_filled: size filled with silence
 * runtime->silence_threshold: threshold from application
 * runtime->silence_size: maximal size from application
 *
 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
 */
60
void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
Linus Torvalds's avatar
Linus Torvalds committed
61
{
62
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
63
	snd_pcm_uframes_t frames, ofs, transfer;
64
	int err;
Linus Torvalds's avatar
Linus Torvalds committed
65
66
67

	if (runtime->silence_size < runtime->boundary) {
		snd_pcm_sframes_t noise_dist, n;
68
69
70
		snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr);
		if (runtime->silence_start != appl_ptr) {
			n = appl_ptr - runtime->silence_start;
Linus Torvalds's avatar
Linus Torvalds committed
71
72
73
74
75
76
			if (n < 0)
				n += runtime->boundary;
			if ((snd_pcm_uframes_t)n < runtime->silence_filled)
				runtime->silence_filled -= n;
			else
				runtime->silence_filled = 0;
77
			runtime->silence_start = appl_ptr;
Linus Torvalds's avatar
Linus Torvalds committed
78
		}
Takashi Iwai's avatar
Takashi Iwai committed
79
		if (runtime->silence_filled >= runtime->buffer_size)
Linus Torvalds's avatar
Linus Torvalds committed
80
81
82
83
84
85
86
87
88
89
			return;
		noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
		if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
			return;
		frames = runtime->silence_threshold - noise_dist;
		if (frames > runtime->silence_size)
			frames = runtime->silence_size;
	} else {
		if (new_hw_ptr == ULONG_MAX) {	/* initialization */
			snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
90
91
			if (avail > runtime->buffer_size)
				avail = runtime->buffer_size;
Linus Torvalds's avatar
Linus Torvalds committed
92
93
94
95
96
97
98
99
100
101
102
103
			runtime->silence_filled = avail > 0 ? avail : 0;
			runtime->silence_start = (runtime->status->hw_ptr +
						  runtime->silence_filled) %
						 runtime->boundary;
		} else {
			ofs = runtime->status->hw_ptr;
			frames = new_hw_ptr - ofs;
			if ((snd_pcm_sframes_t)frames < 0)
				frames += runtime->boundary;
			runtime->silence_filled -= frames;
			if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
				runtime->silence_filled = 0;
104
				runtime->silence_start = new_hw_ptr;
Linus Torvalds's avatar
Linus Torvalds committed
105
			} else {
106
				runtime->silence_start = ofs;
Linus Torvalds's avatar
Linus Torvalds committed
107
108
109
110
			}
		}
		frames = runtime->buffer_size - runtime->silence_filled;
	}
111
112
	if (snd_BUG_ON(frames > runtime->buffer_size))
		return;
Linus Torvalds's avatar
Linus Torvalds committed
113
114
	if (frames == 0)
		return;
115
	ofs = runtime->silence_start % runtime->buffer_size;
Linus Torvalds's avatar
Linus Torvalds committed
116
117
	while (frames > 0) {
		transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
118
119
		err = fill_silence_frames(substream, ofs, transfer);
		snd_BUG_ON(err < 0);
Linus Torvalds's avatar
Linus Torvalds committed
120
121
122
123
124
125
		runtime->silence_filled += transfer;
		frames -= transfer;
		ofs = 0;
	}
}

126
127
#ifdef CONFIG_SND_DEBUG
void snd_pcm_debug_name(struct snd_pcm_substream *substream,
128
129
130
131
132
133
134
135
			   char *name, size_t len)
{
	snprintf(name, len, "pcmC%dD%d%c:%d",
		 substream->pcm->card->number,
		 substream->pcm->device,
		 substream->stream ? 'c' : 'p',
		 substream->number);
}
136
137
EXPORT_SYMBOL(snd_pcm_debug_name);
#endif
138

139
140
141
142
#define XRUN_DEBUG_BASIC	(1<<0)
#define XRUN_DEBUG_STACK	(1<<1)	/* dump also stack */
#define XRUN_DEBUG_JIFFIESCHECK	(1<<2)	/* do jiffies check */

Takashi Iwai's avatar
Takashi Iwai committed
143
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
144

145
146
#define xrun_debug(substream, mask) \
			((substream)->pstr->xrun_debug & (mask))
147
148
149
#else
#define xrun_debug(substream, mask)	0
#endif
Takashi Iwai's avatar
Takashi Iwai committed
150

151
152
153
#define dump_stack_on_xrun(substream) do {			\
		if (xrun_debug(substream, XRUN_DEBUG_STACK))	\
			dump_stack();				\
Takashi Iwai's avatar
Takashi Iwai committed
154
155
	} while (0)

156
static void xrun(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
157
{
158
159
	struct snd_pcm_runtime *runtime = substream->runtime;

160
	trace_xrun(substream);
161
162
	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds's avatar
Linus Torvalds committed
163
	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
164
	if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
165
		char name[16];
166
		snd_pcm_debug_name(substream, name, sizeof(name));
167
		pcm_warn(substream->pcm, "XRUN: %s\n", name);
Takashi Iwai's avatar
Takashi Iwai committed
168
		dump_stack_on_xrun(substream);
Linus Torvalds's avatar
Linus Torvalds committed
169
170
171
	}
}

172
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
173
#define hw_ptr_error(substream, in_interrupt, reason, fmt, args...)	\
174
	do {								\
175
		trace_hw_ptr_error(substream, reason);	\
176
		if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {		\
177
178
			pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
					   (in_interrupt) ? 'Q' : 'P', ##args);	\
179
180
181
182
183
184
185
186
187
188
			dump_stack_on_xrun(substream);			\
		}							\
	} while (0)

#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */

#define hw_ptr_error(substream, fmt, args...) do { } while (0)

#endif

189
190
int snd_pcm_update_state(struct snd_pcm_substream *substream,
			 struct snd_pcm_runtime *runtime)
Linus Torvalds's avatar
Linus Torvalds committed
191
192
193
{
	snd_pcm_uframes_t avail;

194
	avail = snd_pcm_avail(substream);
Linus Torvalds's avatar
Linus Torvalds committed
195
196
	if (avail > runtime->avail_max)
		runtime->avail_max = avail;
197
198
	if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
		if (avail >= runtime->buffer_size) {
Linus Torvalds's avatar
Linus Torvalds committed
199
			snd_pcm_drain_done(substream);
200
201
202
203
			return -EPIPE;
		}
	} else {
		if (avail >= runtime->stop_threshold) {
Linus Torvalds's avatar
Linus Torvalds committed
204
			xrun(substream);
205
206
			return -EPIPE;
		}
Linus Torvalds's avatar
Linus Torvalds committed
207
	}
208
209
210
211
212
	if (runtime->twake) {
		if (avail >= runtime->twake)
			wake_up(&runtime->tsleep);
	} else if (avail >= runtime->control->avail_min)
		wake_up(&runtime->sleep);
Linus Torvalds's avatar
Linus Torvalds committed
213
214
215
	return 0;
}

216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
static void update_audio_tstamp(struct snd_pcm_substream *substream,
				struct timespec *curr_tstamp,
				struct timespec *audio_tstamp)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	u64 audio_frames, audio_nsecs;
	struct timespec driver_tstamp;

	if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
		return;

	if (!(substream->ops->get_time_info) ||
		(runtime->audio_tstamp_report.actual_type ==
			SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {

		/*
		 * provide audio timestamp derived from pointer position
		 * add delay only if requested
		 */

		audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;

		if (runtime->audio_tstamp_config.report_delay) {
			if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
				audio_frames -=  runtime->delay;
			else
				audio_frames +=  runtime->delay;
		}
		audio_nsecs = div_u64(audio_frames * 1000000000LL,
				runtime->rate);
		*audio_tstamp = ns_to_timespec(audio_nsecs);
	}
248
249
250
251
	if (!timespec_equal(&runtime->status->audio_tstamp, audio_tstamp)) {
		runtime->status->audio_tstamp = *audio_tstamp;
		runtime->status->tstamp = *curr_tstamp;
	}
252
253
254
255
256
257
258
259
260

	/*
	 * re-take a driver timestamp to let apps detect if the reference tstamp
	 * read by low-level hardware was provided with a delay
	 */
	snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp);
	runtime->driver_tstamp = driver_tstamp;
}

261
262
static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
				  unsigned int in_interrupt)
Linus Torvalds's avatar
Linus Torvalds committed
263
{
264
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
265
	snd_pcm_uframes_t pos;
266
	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
267
268
	snd_pcm_sframes_t hdelta, delta;
	unsigned long jdelta;
269
270
	unsigned long curr_jiffies;
	struct timespec curr_tstamp;
271
	struct timespec audio_tstamp;
272
	int crossed_boundary = 0;
Linus Torvalds's avatar
Linus Torvalds committed
273

274
	old_hw_ptr = runtime->status->hw_ptr;
275
276
277
278
279
280
281

	/*
	 * group pointer, time and jiffies reads to allow for more
	 * accurate correlations/corrections.
	 * The values are stored at the end of this routine after
	 * corrections for hw_ptr position
	 */
282
	pos = substream->ops->pointer(substream);
283
	curr_jiffies = jiffies;
284
	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
285
286
287
288
289
290
291
292
293
294
295
296
		if ((substream->ops->get_time_info) &&
			(runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
			substream->ops->get_time_info(substream, &curr_tstamp,
						&audio_tstamp,
						&runtime->audio_tstamp_config,
						&runtime->audio_tstamp_report);

			/* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */
			if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
				snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
		} else
			snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
297
298
	}

Linus Torvalds's avatar
Linus Torvalds committed
299
300
301
302
	if (pos == SNDRV_PCM_POS_XRUN) {
		xrun(substream);
		return -EPIPE;
	}
303
	if (pos >= runtime->buffer_size) {
304
		if (printk_ratelimit()) {
305
			char name[16];
306
			snd_pcm_debug_name(substream, name, sizeof(name));
307
			pcm_err(substream->pcm,
308
				"invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
309
310
				name, pos, runtime->buffer_size,
				runtime->period_size);
311
312
		}
		pos = 0;
313
	}
314
	pos -= pos % runtime->min_align;
315
	trace_hwptr(substream, pos, in_interrupt);
Takashi Iwai's avatar
Takashi Iwai committed
316
317
	hw_base = runtime->hw_ptr_base;
	new_hw_ptr = hw_base + pos;
318
319
320
	if (in_interrupt) {
		/* we know that one period was processed */
		/* delta = "expected next hw_ptr" for in_interrupt != 0 */
321
		delta = runtime->hw_ptr_interrupt + runtime->period_size;
322
		if (delta > new_hw_ptr) {
323
			/* check for double acknowledged interrupts */
324
			hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
325
			if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
326
				hw_base += runtime->buffer_size;
327
				if (hw_base >= runtime->boundary) {
328
					hw_base = 0;
329
330
					crossed_boundary++;
				}
331
332
333
				new_hw_ptr = hw_base + pos;
				goto __delta;
			}
Linus Torvalds's avatar
Linus Torvalds committed
334
335
		}
	}
336
337
338
339
	/* new_hw_ptr might be lower than old_hw_ptr in case when */
	/* pointer crosses the end of the ring buffer */
	if (new_hw_ptr < old_hw_ptr) {
		hw_base += runtime->buffer_size;
340
		if (hw_base >= runtime->boundary) {
341
			hw_base = 0;
342
343
			crossed_boundary++;
		}
344
345
346
		new_hw_ptr = hw_base + pos;
	}
      __delta:
347
348
349
	delta = new_hw_ptr - old_hw_ptr;
	if (delta < 0)
		delta += runtime->boundary;
350

351
	if (runtime->no_period_wakeup) {
352
		snd_pcm_sframes_t xrun_threshold;
353
354
355
356
		/*
		 * Without regular period interrupts, we have to check
		 * the elapsed time to detect xruns.
		 */
357
		jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
358
359
		if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
			goto no_delta_check;
360
		hdelta = jdelta - delta * HZ / runtime->rate;
361
362
		xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
		while (hdelta > xrun_threshold) {
363
364
			delta += runtime->buffer_size;
			hw_base += runtime->buffer_size;
365
			if (hw_base >= runtime->boundary) {
366
				hw_base = 0;
367
368
				crossed_boundary++;
			}
369
370
371
			new_hw_ptr = hw_base + pos;
			hdelta -= runtime->hw_ptr_buffer_jiffies;
		}
372
		goto no_delta_check;
373
	}
374

375
	/* something must be really wrong */
376
	if (delta >= runtime->buffer_size + runtime->period_size) {
377
378
379
380
		hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
			     "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
			     substream->stream, (long)pos,
			     (long)new_hw_ptr, (long)old_hw_ptr);
381
382
		return 0;
	}
383
384

	/* Do jiffies check only in xrun_debug mode */
385
	if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
386
387
		goto no_jiffies_check;

388
389
390
391
392
393
	/* Skip the jiffies check for hardwares with BATCH flag.
	 * Such hardware usually just increases the position at each IRQ,
	 * thus it can't give any strange position.
	 */
	if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
		goto no_jiffies_check;
394
	hdelta = delta;
395
396
397
	if (hdelta < runtime->delay)
		goto no_jiffies_check;
	hdelta -= runtime->delay;
398
	jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
399
400
401
402
	if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
		delta = jdelta /
			(((runtime->period_size * HZ) / runtime->rate)
								+ HZ/100);
403
404
		/* move new_hw_ptr according jiffies not pos variable */
		new_hw_ptr = old_hw_ptr;
405
		hw_base = delta;
406
407
408
409
		/* use loop to avoid checks for delta overflows */
		/* the delta value is small or zero in most cases */
		while (delta > 0) {
			new_hw_ptr += runtime->period_size;
410
			if (new_hw_ptr >= runtime->boundary) {
411
				new_hw_ptr -= runtime->boundary;
412
413
				crossed_boundary--;
			}
414
415
416
			delta--;
		}
		/* align hw_base to buffer_size */
417
418
		hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
			     "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
419
420
			     (long)pos, (long)hdelta,
			     (long)runtime->period_size, jdelta,
421
			     ((hdelta * HZ) / runtime->rate), hw_base,
422
423
			     (unsigned long)old_hw_ptr,
			     (unsigned long)new_hw_ptr);
424
425
426
		/* reset values to proper state */
		delta = 0;
		hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
427
	}
428
 no_jiffies_check:
429
	if (delta > runtime->period_size + runtime->period_size / 2) {
430
431
432
		hw_ptr_error(substream, in_interrupt,
			     "Lost interrupts?",
			     "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
Takashi Iwai's avatar
Takashi Iwai committed
433
			     substream->stream, (long)delta,
434
435
			     (long)new_hw_ptr,
			     (long)old_hw_ptr);
Takashi Iwai's avatar
Takashi Iwai committed
436
	}
437

438
 no_delta_check:
439
440
	if (runtime->status->hw_ptr == new_hw_ptr) {
		update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
441
		return 0;
442
	}
443

Linus Torvalds's avatar
Linus Torvalds committed
444
445
446
447
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, new_hw_ptr);

448
	if (in_interrupt) {
449
450
451
452
453
454
455
		delta = new_hw_ptr - runtime->hw_ptr_interrupt;
		if (delta < 0)
			delta += runtime->boundary;
		delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
		runtime->hw_ptr_interrupt += delta;
		if (runtime->hw_ptr_interrupt >= runtime->boundary)
			runtime->hw_ptr_interrupt -= runtime->boundary;
456
	}
Takashi Iwai's avatar
Takashi Iwai committed
457
	runtime->hw_ptr_base = hw_base;
Linus Torvalds's avatar
Linus Torvalds committed
458
	runtime->status->hw_ptr = new_hw_ptr;
459
	runtime->hw_ptr_jiffies = curr_jiffies;
460
461
462
463
	if (crossed_boundary) {
		snd_BUG_ON(crossed_boundary != 1);
		runtime->hw_ptr_wrap += runtime->boundary;
	}
464

465
	update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
466

467
	return snd_pcm_update_state(substream, runtime);
Linus Torvalds's avatar
Linus Torvalds committed
468
469
470
}

/* CAUTION: call it with irq disabled */
471
int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
472
{
473
	return snd_pcm_update_hw_ptr0(substream, 0);
Linus Torvalds's avatar
Linus Torvalds committed
474
475
476
477
478
479
480
481
482
483
}

/**
 * snd_pcm_set_ops - set the PCM operators
 * @pcm: the pcm instance
 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 * @ops: the operator table
 *
 * Sets the given PCM operators to the pcm instance.
 */
484
485
void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
		     const struct snd_pcm_ops *ops)
Linus Torvalds's avatar
Linus Torvalds committed
486
{
487
488
	struct snd_pcm_str *stream = &pcm->streams[direction];
	struct snd_pcm_substream *substream;
Linus Torvalds's avatar
Linus Torvalds committed
489
490
491
492
	
	for (substream = stream->substream; substream != NULL; substream = substream->next)
		substream->ops = ops;
}
493
EXPORT_SYMBOL(snd_pcm_set_ops);
Linus Torvalds's avatar
Linus Torvalds committed
494
495
496
497
498
499
500

/**
 * snd_pcm_sync - set the PCM sync id
 * @substream: the pcm substream
 *
 * Sets the PCM sync identifier for the card.
 */
501
void snd_pcm_set_sync(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
502
{
503
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
504
505
506
507
508
509
	
	runtime->sync.id32[0] = substream->pcm->card->number;
	runtime->sync.id32[1] = -1;
	runtime->sync.id32[2] = -1;
	runtime->sync.id32[3] = -1;
}
510
511
EXPORT_SYMBOL(snd_pcm_set_sync);

Linus Torvalds's avatar
Linus Torvalds committed
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
/*
 *  Standard ioctl routine
 */

static inline unsigned int div32(unsigned int a, unsigned int b, 
				 unsigned int *r)
{
	if (b == 0) {
		*r = 0;
		return UINT_MAX;
	}
	*r = a % b;
	return a / b;
}

static inline unsigned int div_down(unsigned int a, unsigned int b)
{
	if (b == 0)
		return UINT_MAX;
	return a / b;
}

static inline unsigned int div_up(unsigned int a, unsigned int b)
{
	unsigned int r;
	unsigned int q;
	if (b == 0)
		return UINT_MAX;
	q = div32(a, b, &r);
	if (r)
		++q;
	return q;
}

static inline unsigned int mul(unsigned int a, unsigned int b)
{
	if (a == 0)
		return 0;
	if (div_down(UINT_MAX, a) < b)
		return UINT_MAX;
	return a * b;
}

static inline unsigned int muldiv32(unsigned int a, unsigned int b,
				    unsigned int c, unsigned int *r)
{
	u_int64_t n = (u_int64_t) a * b;
	if (c == 0) {
		*r = 0;
		return UINT_MAX;
	}
563
	n = div_u64_rem(n, c, r);
Linus Torvalds's avatar
Linus Torvalds committed
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
	if (n >= UINT_MAX) {
		*r = 0;
		return UINT_MAX;
	}
	return n;
}

/**
 * snd_interval_refine - refine the interval value of configurator
 * @i: the interval value to refine
 * @v: the interval value to refer to
 *
 * Refines the interval value with the reference value.
 * The interval is changed to the range satisfying both intervals.
 * The interval status (min, max, integer, etc.) are evaluated.
 *
580
581
 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
Linus Torvalds's avatar
Linus Torvalds committed
582
 */
583
int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
Linus Torvalds's avatar
Linus Torvalds committed
584
585
{
	int changed = 0;
586
587
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
	if (i->min < v->min) {
		i->min = v->min;
		i->openmin = v->openmin;
		changed = 1;
	} else if (i->min == v->min && !i->openmin && v->openmin) {
		i->openmin = 1;
		changed = 1;
	}
	if (i->max > v->max) {
		i->max = v->max;
		i->openmax = v->openmax;
		changed = 1;
	} else if (i->max == v->max && !i->openmax && v->openmax) {
		i->openmax = 1;
		changed = 1;
	}
	if (!i->integer && v->integer) {
		i->integer = 1;
		changed = 1;
	}
	if (i->integer) {
		if (i->openmin) {
			i->min++;
			i->openmin = 0;
		}
		if (i->openmax) {
			i->max--;
			i->openmax = 0;
		}
	} else if (!i->openmin && !i->openmax && i->min == i->max)
		i->integer = 1;
	if (snd_interval_checkempty(i)) {
		snd_interval_none(i);
		return -EINVAL;
	}
	return changed;
}
625
626
EXPORT_SYMBOL(snd_interval_refine);

627
static int snd_interval_refine_first(struct snd_interval *i)
Linus Torvalds's avatar
Linus Torvalds committed
628
{
629
630
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
631
632
633
634
635
636
637
638
639
	if (snd_interval_single(i))
		return 0;
	i->max = i->min;
	i->openmax = i->openmin;
	if (i->openmax)
		i->max++;
	return 1;
}

640
static int snd_interval_refine_last(struct snd_interval *i)
Linus Torvalds's avatar
Linus Torvalds committed
641
{
642
643
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
644
645
646
647
648
649
650
651
652
	if (snd_interval_single(i))
		return 0;
	i->min = i->max;
	i->openmin = i->openmax;
	if (i->openmin)
		i->min--;
	return 1;
}

653
void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
{
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = mul(a->min, b->min);
	c->openmin = (a->openmin || b->openmin);
	c->max = mul(a->max,  b->max);
	c->openmax = (a->openmax || b->openmax);
	c->integer = (a->integer && b->integer);
}

/**
 * snd_interval_div - refine the interval value with division
Takashi Iwai's avatar
Takashi Iwai committed
669
670
671
 * @a: dividend
 * @b: divisor
 * @c: quotient
Linus Torvalds's avatar
Linus Torvalds committed
672
673
674
675
676
 *
 * c = a / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
677
void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = div32(a->min, b->max, &r);
	c->openmin = (r || a->openmin || b->openmax);
	if (b->min > 0) {
		c->max = div32(a->max, b->min, &r);
		if (r) {
			c->max++;
			c->openmax = 1;
		} else
			c->openmax = (a->openmax || b->openmin);
	} else {
		c->max = UINT_MAX;
		c->openmax = 0;
	}
	c->integer = 0;
}

/**
 * snd_interval_muldivk - refine the interval value
Takashi Iwai's avatar
Takashi Iwai committed
703
704
705
706
707
 * @a: dividend 1
 * @b: dividend 2
 * @k: divisor (as integer)
 * @c: result
  *
Linus Torvalds's avatar
Linus Torvalds committed
708
709
710
711
 * c = a * b / k
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
712
713
void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
		      unsigned int k, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = muldiv32(a->min, b->min, k, &r);
	c->openmin = (r || a->openmin || b->openmin);
	c->max = muldiv32(a->max, b->max, k, &r);
	if (r) {
		c->max++;
		c->openmax = 1;
	} else
		c->openmax = (a->openmax || b->openmax);
	c->integer = 0;
}

/**
 * snd_interval_mulkdiv - refine the interval value
Takashi Iwai's avatar
Takashi Iwai committed
734
735
736
737
 * @a: dividend 1
 * @k: dividend 2 (as integer)
 * @b: divisor
 * @c: result
Linus Torvalds's avatar
Linus Torvalds committed
738
739
740
741
742
 *
 * c = a * k / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
743
744
void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
		      const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = muldiv32(a->min, k, b->max, &r);
	c->openmin = (r || a->openmin || b->openmax);
	if (b->min > 0) {
		c->max = muldiv32(a->max, k, b->min, &r);
		if (r) {
			c->max++;
			c->openmax = 1;
		} else
			c->openmax = (a->openmax || b->openmin);
	} else {
		c->max = UINT_MAX;
		c->openmax = 0;
	}
	c->integer = 0;
}

/* ---- */


/**
 * snd_interval_ratnum - refine the interval value
Takashi Iwai's avatar
Takashi Iwai committed
773
774
775
776
777
 * @i: interval to refine
 * @rats_count: number of ratnum_t 
 * @rats: ratnum_t array
 * @nump: pointer to store the resultant numerator
 * @denp: pointer to store the resultant denominator
Linus Torvalds's avatar
Linus Torvalds committed
778
 *
779
780
 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
Linus Torvalds's avatar
Linus Torvalds committed
781
 */
782
int snd_interval_ratnum(struct snd_interval *i,
783
			unsigned int rats_count, const struct snd_ratnum *rats,
784
			unsigned int *nump, unsigned int *denp)
Linus Torvalds's avatar
Linus Torvalds committed
785
{
786
787
	unsigned int best_num, best_den;
	int best_diff;
Linus Torvalds's avatar
Linus Torvalds committed
788
	unsigned int k;
789
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
790
	int err;
791
792
	unsigned int result_num, result_den;
	int result_diff;
Linus Torvalds's avatar
Linus Torvalds committed
793
794
795
796
797
798
799
800
801

	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num = rats[k].num;
		unsigned int den;
		unsigned int q = i->min;
		int diff;
		if (q == 0)
			q = 1;
802
		den = div_up(num, q);
Linus Torvalds's avatar
Linus Torvalds committed
803
804
805
806
807
808
809
810
811
812
813
		if (den < rats[k].den_min)
			continue;
		if (den > rats[k].den_max)
			den = rats[k].den_max;
		else {
			unsigned int r;
			r = (den - rats[k].den_min) % rats[k].den_step;
			if (r != 0)
				den -= r;
		}
		diff = num - q * den;
814
815
		if (diff < 0)
			diff = -diff;
Linus Torvalds's avatar
Linus Torvalds committed
816
817
818
819
820
821
822
823
824
825
826
827
828
829
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.min = div_down(best_num, best_den);
	t.openmin = !!(best_num % best_den);
	
830
831
832
	result_num = best_num;
	result_diff = best_diff;
	result_den = best_den;
Linus Torvalds's avatar
Linus Torvalds committed
833
834
835
836
837
838
839
840
841
842
	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num = rats[k].num;
		unsigned int den;
		unsigned int q = i->max;
		int diff;
		if (q == 0) {
			i->empty = 1;
			return -EINVAL;
		}
843
		den = div_down(num, q);
Linus Torvalds's avatar
Linus Torvalds committed
844
845
846
847
848
849
850
851
852
853
854
		if (den > rats[k].den_max)
			continue;
		if (den < rats[k].den_min)
			den = rats[k].den_min;
		else {
			unsigned int r;
			r = (den - rats[k].den_min) % rats[k].den_step;
			if (r != 0)
				den += rats[k].den_step - r;
		}
		diff = q * den - num;
855
856
		if (diff < 0)
			diff = -diff;
Linus Torvalds's avatar
Linus Torvalds committed
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.max = div_up(best_num, best_den);
	t.openmax = !!(best_num % best_den);
	t.integer = 0;
	err = snd_interval_refine(i, &t);
	if (err < 0)
		return err;

	if (snd_interval_single(i)) {
876
877
878
879
		if (best_diff * result_den < result_diff * best_den) {
			result_num = best_num;
			result_den = best_den;
		}
Linus Torvalds's avatar
Linus Torvalds committed
880
		if (nump)
881
			*nump = result_num;
Linus Torvalds's avatar
Linus Torvalds committed
882
		if (denp)
883
			*denp = result_den;
Linus Torvalds's avatar
Linus Torvalds committed
884
885
886
	}
	return err;
}
887
888
EXPORT_SYMBOL(snd_interval_ratnum);

Linus Torvalds's avatar
Linus Torvalds committed
889
890
/**
 * snd_interval_ratden - refine the interval value
Takashi Iwai's avatar
Takashi Iwai committed
891
 * @i: interval to refine
892
893
 * @rats_count: number of struct ratden
 * @rats: struct ratden array
Takashi Iwai's avatar
Takashi Iwai committed
894
895
 * @nump: pointer to store the resultant numerator
 * @denp: pointer to store the resultant denominator
Linus Torvalds's avatar
Linus Torvalds committed
896
 *
897
898
 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
Linus Torvalds's avatar
Linus Torvalds committed
899
 */
900
static int snd_interval_ratden(struct snd_interval *i,
901
902
			       unsigned int rats_count,
			       const struct snd_ratden *rats,
Linus Torvalds's avatar
Linus Torvalds committed
903
904
905
906
			       unsigned int *nump, unsigned int *denp)
{
	unsigned int best_num, best_diff, best_den;
	unsigned int k;
907
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
	int err;

	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num;
		unsigned int den = rats[k].den;
		unsigned int q = i->min;
		int diff;
		num = mul(q, den);
		if (num > rats[k].num_max)
			continue;
		if (num < rats[k].num_min)
			num = rats[k].num_max;
		else {
			unsigned int r;
			r = (num - rats[k].num_min) % rats[k].num_step;
			if (r != 0)
				num += rats[k].num_step - r;
		}
		diff = num - q * den;
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.min = div_down(best_num, best_den);
	t.openmin = !!(best_num % best_den);
	
	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num;
		unsigned int den = rats[k].den;
		unsigned int q = i->max;
		int diff;
		num = mul(q, den);
		if (num < rats[k].num_min)
			continue;
		if (num > rats[k].num_max)
			num = rats[k].num_max;
		else {
			unsigned int r;
			r = (num - rats[k].num_min) % rats[k].num_step;
			if (r != 0)
				num -= r;
		}
		diff = q * den - num;
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.max = div_up(best_num, best_den);
	t.openmax = !!(best_num % best_den);
	t.integer = 0;
	err = snd_interval_refine(i, &t);
	if (err < 0)
		return err;

	if (snd_interval_single(i)) {
		if (nump)
			*nump = best_num;
		if (denp)
			*denp = best_den;
	}
	return err;
}

/**
 * snd_interval_list - refine the interval value from the list
 * @i: the interval value to refine
 * @count: the number of elements in the list
 * @list: the value list
 * @mask: the bit-mask to evaluate
 *
 * Refines the interval value from the list.
 * When mask is non-zero, only the elements corresponding to bit 1 are
 * evaluated.
 *
998
999
 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
Linus Torvalds's avatar
Linus Torvalds committed
1000
 */