pcm_lib.c 59.4 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
24
 *                   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>
#include <linux/time.h>
25
#include <linux/math64.h>
Linus Torvalds's avatar
Linus Torvalds committed
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
#include <sound/core.h>
#include <sound/control.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/timer.h>

/*
 * 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
 */
42
void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
Linus Torvalds's avatar
Linus Torvalds committed
43
{
44
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
45
46
47
48
49
50
51
52
53
54
55
56
57
58
	snd_pcm_uframes_t frames, ofs, transfer;

	if (runtime->silence_size < runtime->boundary) {
		snd_pcm_sframes_t noise_dist, n;
		if (runtime->silence_start != runtime->control->appl_ptr) {
			n = runtime->control->appl_ptr - runtime->silence_start;
			if (n < 0)
				n += runtime->boundary;
			if ((snd_pcm_uframes_t)n < runtime->silence_filled)
				runtime->silence_filled -= n;
			else
				runtime->silence_filled = 0;
			runtime->silence_start = runtime->control->appl_ptr;
		}
Takashi Iwai's avatar
Takashi Iwai committed
59
		if (runtime->silence_filled >= runtime->buffer_size)
Linus Torvalds's avatar
Linus Torvalds committed
60
61
62
63
64
65
66
67
68
69
			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);
70
71
			if (avail > runtime->buffer_size)
				avail = runtime->buffer_size;
Linus Torvalds's avatar
Linus Torvalds committed
72
73
74
75
76
77
78
79
80
81
82
83
			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;
84
				runtime->silence_start = new_hw_ptr;
Linus Torvalds's avatar
Linus Torvalds committed
85
			} else {
86
				runtime->silence_start = ofs;
Linus Torvalds's avatar
Linus Torvalds committed
87
88
89
90
			}
		}
		frames = runtime->buffer_size - runtime->silence_filled;
	}
91
92
	if (snd_BUG_ON(frames > runtime->buffer_size))
		return;
Linus Torvalds's avatar
Linus Torvalds committed
93
94
	if (frames == 0)
		return;
95
	ofs = runtime->silence_start % runtime->buffer_size;
Linus Torvalds's avatar
Linus Torvalds committed
96
97
98
99
100
101
102
	while (frames > 0) {
		transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
		if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
		    runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
			if (substream->ops->silence) {
				int err;
				err = substream->ops->silence(substream, -1, ofs, transfer);
103
				snd_BUG_ON(err < 0);
Linus Torvalds's avatar
Linus Torvalds committed
104
105
106
107
108
109
110
111
112
113
114
			} else {
				char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
				snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
			}
		} else {
			unsigned int c;
			unsigned int channels = runtime->channels;
			if (substream->ops->silence) {
				for (c = 0; c < channels; ++c) {
					int err;
					err = substream->ops->silence(substream, c, ofs, transfer);
115
					snd_BUG_ON(err < 0);
Linus Torvalds's avatar
Linus Torvalds committed
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
				}
			} else {
				size_t dma_csize = runtime->dma_bytes / channels;
				for (c = 0; c < channels; ++c) {
					char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
					snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
				}
			}
		}
		runtime->silence_filled += transfer;
		frames -= transfer;
		ofs = 0;
	}
}

131
132
133
134
135
136
137
138
139
140
static void pcm_debug_name(struct snd_pcm_substream *substream,
			   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);
}

141
142
143
144
145
#define XRUN_DEBUG_BASIC	(1<<0)
#define XRUN_DEBUG_STACK	(1<<1)	/* dump also stack */
#define XRUN_DEBUG_JIFFIESCHECK	(1<<2)	/* do jiffies check */
#define XRUN_DEBUG_PERIODUPDATE	(1<<3)	/* full period update info */
#define XRUN_DEBUG_HWPTRUPDATE	(1<<4)	/* full hwptr update info */
146
147
#define XRUN_DEBUG_LOG		(1<<5)	/* show last 10 positions on err */
#define XRUN_DEBUG_LOGONCE	(1<<6)	/* do above only once */
148

Takashi Iwai's avatar
Takashi Iwai committed
149
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
150

151
152
#define xrun_debug(substream, mask) \
			((substream)->pstr->xrun_debug & (mask))
153
154
155
#else
#define xrun_debug(substream, mask)	0
#endif
Takashi Iwai's avatar
Takashi Iwai committed
156

157
158
159
#define dump_stack_on_xrun(substream) do {			\
		if (xrun_debug(substream, XRUN_DEBUG_STACK))	\
			dump_stack();				\
Takashi Iwai's avatar
Takashi Iwai committed
160
161
	} while (0)

162
static void xrun(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
163
{
164
165
166
167
	struct snd_pcm_runtime *runtime = substream->runtime;

	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds's avatar
Linus Torvalds committed
168
	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
169
	if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
170
171
172
		char name[16];
		pcm_debug_name(substream, name, sizeof(name));
		snd_printd(KERN_DEBUG "XRUN: %s\n", name);
Takashi Iwai's avatar
Takashi Iwai committed
173
		dump_stack_on_xrun(substream);
Linus Torvalds's avatar
Linus Torvalds committed
174
175
176
	}
}

177
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
178
179
180
#define hw_ptr_error(substream, fmt, args...)				\
	do {								\
		if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {		\
181
			xrun_log_show(substream);			\
182
183
184
185
186
187
188
189
190
191
192
			if (printk_ratelimit()) {			\
				snd_printd("PCM: " fmt, ##args);	\
			}						\
			dump_stack_on_xrun(substream);			\
		}							\
	} while (0)

#define XRUN_LOG_CNT	10

struct hwptr_log_entry {
	unsigned long jiffies;
Linus Torvalds's avatar
Linus Torvalds committed
193
	snd_pcm_uframes_t pos;
194
195
196
197
198
	snd_pcm_uframes_t period_size;
	snd_pcm_uframes_t buffer_size;
	snd_pcm_uframes_t old_hw_ptr;
	snd_pcm_uframes_t hw_ptr_base;
};
Linus Torvalds's avatar
Linus Torvalds committed
199

200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
struct snd_pcm_hwptr_log {
	unsigned int idx;
	unsigned int hit: 1;
	struct hwptr_log_entry entries[XRUN_LOG_CNT];
};

static void xrun_log(struct snd_pcm_substream *substream,
		     snd_pcm_uframes_t pos)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
	struct hwptr_log_entry *entry;

	if (log == NULL) {
		log = kzalloc(sizeof(*log), GFP_ATOMIC);
		if (log == NULL)
			return;
		runtime->hwptr_log = log;
	} else {
		if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
			return;
221
	}
222
223
224
225
	entry = &log->entries[log->idx];
	entry->jiffies = jiffies;
	entry->pos = pos;
	entry->period_size = runtime->period_size;
226
	entry->buffer_size = runtime->buffer_size;
227
228
229
	entry->old_hw_ptr = runtime->status->hw_ptr;
	entry->hw_ptr_base = runtime->hw_ptr_base;
	log->idx = (log->idx + 1) % XRUN_LOG_CNT;
Linus Torvalds's avatar
Linus Torvalds committed
230
231
}

232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
static void xrun_log_show(struct snd_pcm_substream *substream)
{
	struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
	struct hwptr_log_entry *entry;
	char name[16];
	unsigned int idx;
	int cnt;

	if (log == NULL)
		return;
	if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
		return;
	pcm_debug_name(substream, name, sizeof(name));
	for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
		entry = &log->entries[idx];
		if (entry->period_size == 0)
			break;
249
250
		snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
			   "hwptr=%ld/%ld\n",
251
252
253
254
			   name, entry->jiffies, (unsigned long)entry->pos,
			   (unsigned long)entry->period_size,
			   (unsigned long)entry->buffer_size,
			   (unsigned long)entry->old_hw_ptr,
255
			   (unsigned long)entry->hw_ptr_base);
256
257
258
259
260
261
262
263
264
265
266
267
268
269
		idx++;
		idx %= XRUN_LOG_CNT;
	}
	log->hit = 1;
}

#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */

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

#endif

270
271
int snd_pcm_update_state(struct snd_pcm_substream *substream,
			 struct snd_pcm_runtime *runtime)
Linus Torvalds's avatar
Linus Torvalds committed
272
273
274
275
276
277
278
279
280
{
	snd_pcm_uframes_t avail;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		avail = snd_pcm_playback_avail(runtime);
	else
		avail = snd_pcm_capture_avail(runtime);
	if (avail > runtime->avail_max)
		runtime->avail_max = avail;
281
282
	if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
		if (avail >= runtime->buffer_size) {
Linus Torvalds's avatar
Linus Torvalds committed
283
			snd_pcm_drain_done(substream);
284
285
286
287
			return -EPIPE;
		}
	} else {
		if (avail >= runtime->stop_threshold) {
Linus Torvalds's avatar
Linus Torvalds committed
288
			xrun(substream);
289
290
			return -EPIPE;
		}
Linus Torvalds's avatar
Linus Torvalds committed
291
	}
292
293
294
295
296
	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
297
298
299
	return 0;
}

300
301
static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
				  unsigned int in_interrupt)
Linus Torvalds's avatar
Linus Torvalds committed
302
{
303
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
304
	snd_pcm_uframes_t pos;
305
	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
306
307
	snd_pcm_sframes_t hdelta, delta;
	unsigned long jdelta;
Linus Torvalds's avatar
Linus Torvalds committed
308

309
	old_hw_ptr = runtime->status->hw_ptr;
310
	pos = substream->ops->pointer(substream);
Linus Torvalds's avatar
Linus Torvalds committed
311
312
313
314
	if (pos == SNDRV_PCM_POS_XRUN) {
		xrun(substream);
		return -EPIPE;
	}
315
316
317
318
319
320
321
322
323
324
325
	if (pos >= runtime->buffer_size) {
		if (printk_ratelimit()) {
			char name[16];
			pcm_debug_name(substream, name, sizeof(name));
			xrun_log_show(substream);
			snd_printd(KERN_ERR  "BUG: %s, pos = %ld, "
				   "buffer size = %ld, period size = %ld\n",
				   name, pos, runtime->buffer_size,
				   runtime->period_size);
		}
		pos = 0;
326
	}
327
328
329
	pos -= pos % runtime->min_align;
	if (xrun_debug(substream, XRUN_DEBUG_LOG))
		xrun_log(substream, pos);
Takashi Iwai's avatar
Takashi Iwai committed
330
331
	hw_base = runtime->hw_ptr_base;
	new_hw_ptr = hw_base + pos;
332
333
334
	if (in_interrupt) {
		/* we know that one period was processed */
		/* delta = "expected next hw_ptr" for in_interrupt != 0 */
335
		delta = runtime->hw_ptr_interrupt + runtime->period_size;
336
		if (delta > new_hw_ptr) {
337
338
339
340
341
342
343
344
345
			/* check for double acknowledged interrupts */
			hdelta = jiffies - runtime->hw_ptr_jiffies;
			if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
				hw_base += runtime->buffer_size;
				if (hw_base >= runtime->boundary)
					hw_base = 0;
				new_hw_ptr = hw_base + pos;
				goto __delta;
			}
Linus Torvalds's avatar
Linus Torvalds committed
346
347
		}
	}
348
349
350
351
352
353
354
355
356
	/* 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;
		if (hw_base >= runtime->boundary)
			hw_base = 0;
		new_hw_ptr = hw_base + pos;
	}
      __delta:
357
358
359
	delta = new_hw_ptr - old_hw_ptr;
	if (delta < 0)
		delta += runtime->boundary;
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
	if (xrun_debug(substream, in_interrupt ?
			XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
		char name[16];
		pcm_debug_name(substream, name, sizeof(name));
		snd_printd("%s_update: %s: pos=%u/%u/%u, "
			   "hwptr=%ld/%ld/%ld/%ld\n",
			   in_interrupt ? "period" : "hwptr",
			   name,
			   (unsigned int)pos,
			   (unsigned int)runtime->period_size,
			   (unsigned int)runtime->buffer_size,
			   (unsigned long)delta,
			   (unsigned long)old_hw_ptr,
			   (unsigned long)new_hw_ptr,
			   (unsigned long)runtime->hw_ptr_base);
	}
376

377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
	if (runtime->no_period_wakeup) {
		/*
		 * Without regular period interrupts, we have to check
		 * the elapsed time to detect xruns.
		 */
		jdelta = jiffies - runtime->hw_ptr_jiffies;
		hdelta = jdelta - delta * HZ / runtime->rate;
		while (hdelta > runtime->hw_ptr_buffer_jiffies / 2 + 1) {
			delta += runtime->buffer_size;
			hw_base += runtime->buffer_size;
			if (hw_base >= runtime->boundary)
				hw_base = 0;
			new_hw_ptr = hw_base + pos;
			hdelta -= runtime->hw_ptr_buffer_jiffies;
		}
392
		goto no_delta_check;
393
	}
394

395
	/* something must be really wrong */
396
	if (delta >= runtime->buffer_size + runtime->period_size) {
397
398
399
400
401
402
403
404
405
		hw_ptr_error(substream,
			       "Unexpected hw_pointer value %s"
			       "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
			       "old_hw_ptr=%ld)\n",
				     in_interrupt ? "[Q] " : "[P]",
				     substream->stream, (long)pos,
				     (long)new_hw_ptr, (long)old_hw_ptr);
		return 0;
	}
406
407

	/* Do jiffies check only in xrun_debug mode */
408
	if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
409
410
		goto no_jiffies_check;

411
412
413
414
415
416
	/* 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;
417
	hdelta = delta;
418
419
420
	if (hdelta < runtime->delay)
		goto no_jiffies_check;
	hdelta -= runtime->delay;
421
422
423
424
425
	jdelta = jiffies - runtime->hw_ptr_jiffies;
	if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
		delta = jdelta /
			(((runtime->period_size * HZ) / runtime->rate)
								+ HZ/100);
426
427
		/* move new_hw_ptr according jiffies not pos variable */
		new_hw_ptr = old_hw_ptr;
428
		hw_base = delta;
429
430
431
432
433
434
435
436
437
		/* 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;
			if (new_hw_ptr >= runtime->boundary)
				new_hw_ptr -= runtime->boundary;
			delta--;
		}
		/* align hw_base to buffer_size */
438
		hw_ptr_error(substream,
439
			     "hw_ptr skipping! %s"
440
			     "(pos=%ld, delta=%ld, period=%ld, "
441
442
			     "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
			     in_interrupt ? "[Q] " : "",
443
444
			     (long)pos, (long)hdelta,
			     (long)runtime->period_size, jdelta,
445
			     ((hdelta * HZ) / runtime->rate), hw_base,
446
447
			     (unsigned long)old_hw_ptr,
			     (unsigned long)new_hw_ptr);
448
449
450
		/* reset values to proper state */
		delta = 0;
		hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
451
	}
452
 no_jiffies_check:
453
	if (delta > runtime->period_size + runtime->period_size / 2) {
Takashi Iwai's avatar
Takashi Iwai committed
454
		hw_ptr_error(substream,
455
456
457
458
			     "Lost interrupts? %s"
			     "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
			     "old_hw_ptr=%ld)\n",
			     in_interrupt ? "[Q] " : "",
Takashi Iwai's avatar
Takashi Iwai committed
459
			     substream->stream, (long)delta,
460
461
			     (long)new_hw_ptr,
			     (long)old_hw_ptr);
Takashi Iwai's avatar
Takashi Iwai committed
462
	}
463

464
 no_delta_check:
465
466
	if (runtime->status->hw_ptr == new_hw_ptr)
		return 0;
467

Linus Torvalds's avatar
Linus Torvalds committed
468
469
470
471
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, new_hw_ptr);

472
	if (in_interrupt) {
473
474
475
476
477
478
479
		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;
480
	}
Takashi Iwai's avatar
Takashi Iwai committed
481
	runtime->hw_ptr_base = hw_base;
Linus Torvalds's avatar
Linus Torvalds committed
482
	runtime->status->hw_ptr = new_hw_ptr;
483
	runtime->hw_ptr_jiffies = jiffies;
484
485
	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds's avatar
Linus Torvalds committed
486

487
	return snd_pcm_update_state(substream, runtime);
Linus Torvalds's avatar
Linus Torvalds committed
488
489
490
}

/* CAUTION: call it with irq disabled */
491
int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
492
{
493
	return snd_pcm_update_hw_ptr0(substream, 0);
Linus Torvalds's avatar
Linus Torvalds committed
494
495
496
497
498
499
500
501
502
503
}

/**
 * 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.
 */
504
void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
Linus Torvalds's avatar
Linus Torvalds committed
505
{
506
507
	struct snd_pcm_str *stream = &pcm->streams[direction];
	struct snd_pcm_substream *substream;
Linus Torvalds's avatar
Linus Torvalds committed
508
509
510
511
512
	
	for (substream = stream->substream; substream != NULL; substream = substream->next)
		substream->ops = ops;
}

513
EXPORT_SYMBOL(snd_pcm_set_ops);
Linus Torvalds's avatar
Linus Torvalds committed
514
515
516
517
518
519
520

/**
 * snd_pcm_sync - set the PCM sync id
 * @substream: the pcm substream
 *
 * Sets the PCM sync identifier for the card.
 */
521
void snd_pcm_set_sync(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
522
{
523
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
524
525
526
527
528
529
530
	
	runtime->sync.id32[0] = substream->pcm->card->number;
	runtime->sync.id32[1] = -1;
	runtime->sync.id32[2] = -1;
	runtime->sync.id32[3] = -1;
}

531
532
EXPORT_SYMBOL(snd_pcm_set_sync);

Linus Torvalds's avatar
Linus Torvalds committed
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
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
/*
 *  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) {
581
		snd_BUG_ON(!n);
Linus Torvalds's avatar
Linus Torvalds committed
582
583
584
		*r = 0;
		return UINT_MAX;
	}
585
	n = div_u64_rem(n, c, r);
Linus Torvalds's avatar
Linus Torvalds committed
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
	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.
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
604
int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
Linus Torvalds's avatar
Linus Torvalds committed
605
606
{
	int changed = 0;
607
608
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
	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;
}

647
648
EXPORT_SYMBOL(snd_interval_refine);

649
static int snd_interval_refine_first(struct snd_interval *i)
Linus Torvalds's avatar
Linus Torvalds committed
650
{
651
652
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
653
654
655
656
657
658
659
660
661
	if (snd_interval_single(i))
		return 0;
	i->max = i->min;
	i->openmax = i->openmin;
	if (i->openmax)
		i->max++;
	return 1;
}

662
static int snd_interval_refine_last(struct snd_interval *i)
Linus Torvalds's avatar
Linus Torvalds committed
663
{
664
665
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
666
667
668
669
670
671
672
673
674
	if (snd_interval_single(i))
		return 0;
	i->min = i->max;
	i->openmin = i->openmax;
	if (i->openmin)
		i->min--;
	return 1;
}

675
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
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
{
	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
691
692
693
 * @a: dividend
 * @b: divisor
 * @c: quotient
Linus Torvalds's avatar
Linus Torvalds committed
694
695
696
697
698
 *
 * c = a / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
699
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
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
{
	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
725
726
727
728
729
 * @a: dividend 1
 * @b: dividend 2
 * @k: divisor (as integer)
 * @c: result
  *
Linus Torvalds's avatar
Linus Torvalds committed
730
731
732
733
 * c = a * b / k
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
734
735
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
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
{
	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
756
757
758
759
 * @a: dividend 1
 * @k: dividend 2 (as integer)
 * @b: divisor
 * @c: result
Linus Torvalds's avatar
Linus Torvalds committed
760
761
762
763
764
 *
 * c = a * k / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
765
766
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
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
{
	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
795
796
797
798
799
 * @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
800
801
802
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
803
804
805
int snd_interval_ratnum(struct snd_interval *i,
			unsigned int rats_count, struct snd_ratnum *rats,
			unsigned int *nump, unsigned int *denp)
Linus Torvalds's avatar
Linus Torvalds committed
806
{
807
808
	unsigned int best_num, best_den;
	int best_diff;
Linus Torvalds's avatar
Linus Torvalds committed
809
	unsigned int k;
810
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
811
	int err;
812
813
	unsigned int result_num, result_den;
	int result_diff;
Linus Torvalds's avatar
Linus Torvalds committed
814
815
816
817
818
819
820
821
822

	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;
823
		den = div_up(num, q);
Linus Torvalds's avatar
Linus Torvalds committed
824
825
826
827
828
829
830
831
832
833
834
		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;
835
836
		if (diff < 0)
			diff = -diff;
Linus Torvalds's avatar
Linus Torvalds committed
837
838
839
840
841
842
843
844
845
846
847
848
849
850
		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);
	
851
852
853
	result_num = best_num;
	result_diff = best_diff;
	result_den = best_den;
Linus Torvalds's avatar
Linus Torvalds committed
854
855
856
857
858
859
860
861
862
863
	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;
		}
864
		den = div_down(num, q);
Linus Torvalds's avatar
Linus Torvalds committed
865
866
867
868
869
870
871
872
873
874
875
		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;
876
877
		if (diff < 0)
			diff = -diff;
Linus Torvalds's avatar
Linus Torvalds committed
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
		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)) {
897
898
899
900
		if (best_diff * result_den < result_diff * best_den) {
			result_num = best_num;
			result_den = best_den;
		}
Linus Torvalds's avatar
Linus Torvalds committed
901
		if (nump)
902
			*nump = result_num;
Linus Torvalds's avatar
Linus Torvalds committed
903
		if (denp)
904
			*denp = result_den;
Linus Torvalds's avatar
Linus Torvalds committed
905
906
907
908
	}
	return err;
}

909
910
EXPORT_SYMBOL(snd_interval_ratnum);

Linus Torvalds's avatar
Linus Torvalds committed
911
912
/**
 * snd_interval_ratden - refine the interval value
Takashi Iwai's avatar
Takashi Iwai committed
913
 * @i: interval to refine
914
915
 * @rats_count: number of struct ratden
 * @rats: struct ratden array
Takashi Iwai's avatar
Takashi Iwai committed
916
917
 * @nump: pointer to store the resultant numerator
 * @denp: pointer to store the resultant denominator
Linus Torvalds's avatar
Linus Torvalds committed
918
919
920
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
921
922
static int snd_interval_ratden(struct snd_interval *i,
			       unsigned int rats_count, struct snd_ratden *rats,
Linus Torvalds's avatar
Linus Torvalds committed
923
924
925
926
			       unsigned int *nump, unsigned int *denp)
{
	unsigned int best_num, best_diff, best_den;
	unsigned int k;
927
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
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
998
999
1000
	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;
For faster browsing, not all history is shown. View entire blame