2 This file is part of PulseAudio.
4 Copyright 2004-2006 Lennart Poettering
5 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
7 PulseAudio is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Lesser General Public License as published
9 by the Free Software Foundation; either version 2 of the License,
10 or (at your option) any later version.
12 PulseAudio is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with PulseAudio; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
27 #include <sys/types.h>
29 #include <asoundlib.h>
31 #include <pulse/sample.h>
32 #include <pulse/xmalloc.h>
34 #include <pulsecore/log.h>
35 #include <pulsecore/macro.h>
36 #include <pulsecore/core-util.h>
37 #include <pulsecore/atomic.h>
39 #include "alsa-util.h"
41 struct pa_alsa_fdlist {
44 /* This is a temporary buffer used to avoid lots of mallocs */
45 struct pollfd *work_fds;
50 pa_defer_event *defer;
55 void (*cb)(void *userdata);
59 static void io_cb(pa_mainloop_api*a, pa_io_event* e, int fd, pa_io_event_flags_t events, void *userdata) {
61 struct pa_alsa_fdlist *fdl = userdata;
64 unsigned short revents;
68 pa_assert(fdl->mixer);
70 pa_assert(fdl->work_fds);
77 memcpy(fdl->work_fds, fdl->fds, sizeof(struct pollfd) * fdl->num_fds);
79 for (i = 0; i < fdl->num_fds; i++) {
80 if (e == fdl->ios[i]) {
81 if (events & PA_IO_EVENT_INPUT)
82 fdl->work_fds[i].revents |= POLLIN;
83 if (events & PA_IO_EVENT_OUTPUT)
84 fdl->work_fds[i].revents |= POLLOUT;
85 if (events & PA_IO_EVENT_ERROR)
86 fdl->work_fds[i].revents |= POLLERR;
87 if (events & PA_IO_EVENT_HANGUP)
88 fdl->work_fds[i].revents |= POLLHUP;
93 pa_assert(i != fdl->num_fds);
95 if ((err = snd_mixer_poll_descriptors_revents(fdl->mixer, fdl->work_fds, fdl->num_fds, &revents)) < 0) {
96 pa_log_error("Unable to get poll revent: %s", snd_strerror(err));
100 a->defer_enable(fdl->defer, 1);
103 snd_mixer_handle_events(fdl->mixer);
106 static void defer_cb(pa_mainloop_api*a, pa_defer_event* e, void *userdata) {
107 struct pa_alsa_fdlist *fdl = userdata;
114 pa_assert(fdl->mixer);
116 a->defer_enable(fdl->defer, 0);
118 num_fds = (unsigned) snd_mixer_poll_descriptors_count(fdl->mixer);
120 if (num_fds != fdl->num_fds) {
124 pa_xfree(fdl->work_fds);
125 fdl->fds = pa_xnew0(struct pollfd, num_fds);
126 fdl->work_fds = pa_xnew(struct pollfd, num_fds);
129 memset(fdl->work_fds, 0, sizeof(struct pollfd) * num_fds);
131 if ((err = snd_mixer_poll_descriptors(fdl->mixer, fdl->work_fds, num_fds)) < 0) {
132 pa_log_error("Unable to get poll descriptors: %s", snd_strerror(err));
138 if (memcmp(fdl->fds, fdl->work_fds, sizeof(struct pollfd) * num_fds) == 0)
142 for (i = 0; i < fdl->num_fds; i++)
143 a->io_free(fdl->ios[i]);
145 if (num_fds != fdl->num_fds) {
152 fdl->ios = pa_xnew(pa_io_event*, num_fds);
155 temp = fdl->work_fds;
156 fdl->work_fds = fdl->fds;
159 fdl->num_fds = num_fds;
161 for (i = 0;i < num_fds;i++)
162 fdl->ios[i] = a->io_new(a, fdl->fds[i].fd,
163 ((fdl->fds[i].events & POLLIN) ? PA_IO_EVENT_INPUT : 0) |
164 ((fdl->fds[i].events & POLLOUT) ? PA_IO_EVENT_OUTPUT : 0),
168 struct pa_alsa_fdlist *pa_alsa_fdlist_new(void) {
169 struct pa_alsa_fdlist *fdl;
171 fdl = pa_xnew0(struct pa_alsa_fdlist, 1);
175 fdl->work_fds = NULL;
185 void pa_alsa_fdlist_free(struct pa_alsa_fdlist *fdl) {
190 fdl->m->defer_free(fdl->defer);
196 for (i = 0; i < fdl->num_fds; i++)
197 fdl->m->io_free(fdl->ios[i]);
204 pa_xfree(fdl->work_fds);
209 int pa_alsa_fdlist_set_mixer(struct pa_alsa_fdlist *fdl, snd_mixer_t *mixer_handle, pa_mainloop_api* m) {
211 pa_assert(mixer_handle);
215 fdl->mixer = mixer_handle;
217 fdl->defer = m->defer_new(m, defer_cb, fdl);
222 static int set_format(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, pa_sample_format_t *f) {
224 static const snd_pcm_format_t format_trans[] = {
225 [PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
226 [PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
227 [PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW,
228 [PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE,
229 [PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE,
230 [PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
231 [PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
232 [PA_SAMPLE_S32LE] = SND_PCM_FORMAT_S32_LE,
233 [PA_SAMPLE_S32BE] = SND_PCM_FORMAT_S32_BE,
236 static const pa_sample_format_t try_order[] = {
251 pa_assert(pcm_handle);
254 if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
257 if (*f == PA_SAMPLE_FLOAT32BE)
258 *f = PA_SAMPLE_FLOAT32LE;
259 else if (*f == PA_SAMPLE_FLOAT32LE)
260 *f = PA_SAMPLE_FLOAT32BE;
261 else if (*f == PA_SAMPLE_S16BE)
262 *f = PA_SAMPLE_S16LE;
263 else if (*f == PA_SAMPLE_S16LE)
264 *f = PA_SAMPLE_S16BE;
265 else if (*f == PA_SAMPLE_S32BE)
266 *f = PA_SAMPLE_S32LE;
267 else if (*f == PA_SAMPLE_S32LE)
268 *f = PA_SAMPLE_S32BE;
272 if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
277 for (i = 0; try_order[i] != PA_SAMPLE_INVALID; i++) {
280 if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
287 /* Set the hardware parameters of the given ALSA device. Returns the
288 * selected fragment settings in *period and *period_size */
289 int pa_alsa_set_hw_params(
290 snd_pcm_t *pcm_handle,
293 snd_pcm_uframes_t *period_size,
294 snd_pcm_uframes_t tsched_size,
296 pa_bool_t *use_tsched,
297 pa_bool_t require_exact_channel_number) {
300 snd_pcm_uframes_t _period_size = *period_size;
301 unsigned int _periods = *periods;
302 snd_pcm_uframes_t buffer_size;
303 unsigned int r = ss->rate;
304 unsigned int c = ss->channels;
305 pa_sample_format_t f = ss->format;
306 snd_pcm_hw_params_t *hwparams;
307 pa_bool_t _use_mmap = use_mmap && *use_mmap;
308 pa_bool_t _use_tsched = use_tsched && *use_tsched;
311 pa_assert(pcm_handle);
314 pa_assert(period_size);
316 snd_pcm_hw_params_alloca(&hwparams);
318 if ((ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0)
321 if ((ret = snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, 0)) < 0)
325 if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_INTERLEAVED)) < 0) {
327 /* mmap() didn't work, fall back to interleaved */
329 if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
335 } else if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
341 if ((ret = set_format(pcm_handle, hwparams, &f)) < 0)
344 if ((ret = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &r, NULL)) < 0)
347 /* Adjust the buffer sizes, if we didn't get the rate we were asking for */
348 _period_size = (snd_pcm_uframes_t) (((uint64_t) _period_size * r) / ss->rate);
349 tsched_size = (snd_pcm_uframes_t) (((uint64_t) tsched_size * r) / ss->rate);
351 if (require_exact_channel_number) {
352 if ((ret = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, c)) < 0)
355 if ((ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0)
360 _period_size = tsched_size;
363 pa_assert_se(snd_pcm_hw_params_get_buffer_size_max(hwparams, &buffer_size) == 0);
364 pa_log_debug("Maximum hw buffer size is %u ms", (unsigned) buffer_size * 1000 / r);
367 buffer_size = _periods * _period_size;
369 if ((ret = snd_pcm_hw_params_set_periods_integer(pcm_handle, hwparams)) < 0)
374 if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0) {
376 if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0)
381 if (_period_size > 0)
382 if ((ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size)) < 0)
385 if ((ret = snd_pcm_hw_params(pcm_handle, hwparams)) < 0)
389 pa_log_warn("Device %s doesn't support %u Hz, changed to %u Hz.", snd_pcm_name(pcm_handle), ss->rate, r);
391 if (ss->channels != c)
392 pa_log_warn("Device %s doesn't support %u channels, changed to %u.", snd_pcm_name(pcm_handle), ss->channels, c);
395 pa_log_warn("Device %s doesn't support sample format %s, changed to %s.", snd_pcm_name(pcm_handle), pa_sample_format_to_string(ss->format), pa_sample_format_to_string(f));
397 if ((ret = snd_pcm_prepare(pcm_handle)) < 0)
400 if ((ret = snd_pcm_hw_params_get_period_size(hwparams, &_period_size, &dir)) < 0 ||
401 (ret = snd_pcm_hw_params_get_periods(hwparams, &_periods, &dir)) < 0)
404 /* If the sample rate deviates too much, we need to resample */
405 if (r < ss->rate*.95 || r > ss->rate*1.05)
407 ss->channels = (uint8_t) c;
410 pa_assert(_periods > 0);
411 pa_assert(_period_size > 0);
414 *period_size = _period_size;
417 *use_mmap = _use_mmap;
420 *use_tsched = _use_tsched;
429 int pa_alsa_set_sw_params(snd_pcm_t *pcm, snd_pcm_uframes_t avail_min) {
430 snd_pcm_sw_params_t *swparams;
435 snd_pcm_sw_params_alloca(&swparams);
437 if ((err = snd_pcm_sw_params_current(pcm, swparams) < 0)) {
438 pa_log_warn("Unable to determine current swparams: %s\n", snd_strerror(err));
442 if ((err = snd_pcm_sw_params_set_stop_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) {
443 pa_log_warn("Unable to set stop threshold: %s\n", snd_strerror(err));
447 if ((err = snd_pcm_sw_params_set_start_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) {
448 pa_log_warn("Unable to set start threshold: %s\n", snd_strerror(err));
452 if ((err = snd_pcm_sw_params_set_avail_min(pcm, swparams, avail_min)) < 0) {
453 pa_log_error("snd_pcm_sw_params_set_avail_min() failed: %s", snd_strerror(err));
457 if ((err = snd_pcm_sw_params(pcm, swparams)) < 0) {
458 pa_log_warn("Unable to set sw params: %s\n", snd_strerror(err));
470 static const struct device_info device_table[] = {
471 {{ 2, { PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT } }, "front" },
473 {{ 4, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
474 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT }}, "surround40" },
476 {{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
477 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
478 PA_CHANNEL_POSITION_LFE }}, "surround41" },
480 {{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
481 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
482 PA_CHANNEL_POSITION_CENTER }}, "surround50" },
484 {{ 6, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
485 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
486 PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE }}, "surround51" },
488 {{ 8, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
489 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
490 PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE,
491 PA_CHANNEL_POSITION_SIDE_LEFT, PA_CHANNEL_POSITION_SIDE_RIGHT }} , "surround71" },
496 static pa_bool_t channel_map_superset(const pa_channel_map *a, const pa_channel_map *b) {
497 pa_bool_t in_a[PA_CHANNEL_POSITION_MAX];
503 memset(in_a, 0, sizeof(in_a));
505 for (i = 0; i < a->channels; i++)
506 in_a[a->map[i]] = TRUE;
508 for (i = 0; i < b->channels; i++)
509 if (!in_a[b->map[i]])
515 snd_pcm_t *pa_alsa_open_by_device_id(
522 snd_pcm_uframes_t *period_size,
523 snd_pcm_uframes_t tsched_size,
525 pa_bool_t *use_tsched) {
531 snd_pcm_t *pcm_handle;
538 pa_assert(period_size);
540 /* First we try to find a device string with a superset of the
541 * requested channel map and open it without the plug: prefix. We
542 * iterate through our device table from top to bottom and take
543 * the first that matches. If we didn't find a working device that
544 * way, we iterate backwards, and check all devices that do not
545 * provide a superset of the requested channel map.*/
547 for (i = 0;; i += direction) {
548 pa_sample_spec try_ss;
551 pa_assert(direction == -1);
553 /* OK, so we iterated backwards, and now are at the
554 * beginning of our list. */
558 } else if (!device_table[i].name) {
559 pa_assert(direction == 1);
561 /* OK, so we are at the end of our list. at iterated
568 if ((direction > 0) == !channel_map_superset(&device_table[i].map, map))
571 d = pa_sprintf_malloc("%s:%s", device_table[i].name, dev_id);
572 pa_log_debug("Trying %s...", d);
574 if ((err = snd_pcm_open(&pcm_handle, d, mode,
576 SND_PCM_NO_AUTO_RESAMPLE|
577 SND_PCM_NO_AUTO_CHANNELS|
578 SND_PCM_NO_AUTO_FORMAT |
579 SND_PCM_NO_SOFTVOL)) < 0) {
580 pa_log_info("Couldn't open PCM device %s: %s", d, snd_strerror(err));
585 try_ss.channels = device_table[i].map.channels;
586 try_ss.rate = ss->rate;
587 try_ss.format = ss->format;
589 if ((err = pa_alsa_set_hw_params(pcm_handle, &try_ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, TRUE)) < 0) {
590 pa_log_info("PCM device %s refused our hw parameters: %s", d, snd_strerror(err));
592 snd_pcm_close(pcm_handle);
597 *map = device_table[i].map;
598 pa_assert(map->channels == ss->channels);
603 /* OK, we didn't find any good device, so let's try the raw plughw: stuff */
605 d = pa_sprintf_malloc("plughw:%s", dev_id);
606 pa_log_debug("Trying %s as last resort...", d);
607 pcm_handle = pa_alsa_open_by_device_string(d, dev, ss, map, mode, nfrags, period_size, tsched_size, use_mmap, use_tsched);
613 snd_pcm_t *pa_alsa_open_by_device_string(
620 snd_pcm_uframes_t *period_size,
621 snd_pcm_uframes_t tsched_size,
623 pa_bool_t *use_tsched) {
627 snd_pcm_t *pcm_handle;
634 pa_assert(period_size);
636 d = pa_xstrdup(device);
640 if ((err = snd_pcm_open(&pcm_handle, d, mode, SND_PCM_NONBLOCK|
641 SND_PCM_NO_AUTO_RESAMPLE|
642 SND_PCM_NO_AUTO_CHANNELS|
643 SND_PCM_NO_AUTO_FORMAT)) < 0) {
644 pa_log("Error opening PCM device %s: %s", d, snd_strerror(err));
649 if ((err = pa_alsa_set_hw_params(pcm_handle, ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, FALSE)) < 0) {
652 /* Hmm, some hw is very exotic, so we retry with plug, if without it didn't work */
654 if (pa_startswith(d, "hw:")) {
655 char *t = pa_sprintf_malloc("plughw:%s", d+3);
656 pa_log_debug("Opening the device as '%s' didn't work, retrying with '%s'.", d, t);
660 snd_pcm_close(pcm_handle);
664 pa_log("Failed to set hardware parameters on %s: %s", d, snd_strerror(err));
666 snd_pcm_close(pcm_handle);
673 if (ss->channels != map->channels)
674 pa_channel_map_init_extend(map, ss->channels, PA_CHANNEL_MAP_ALSA);
680 int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev) {
686 if ((err = snd_mixer_attach(mixer, dev)) < 0) {
687 pa_log_info("Unable to attach to mixer %s: %s", dev, snd_strerror(err));
691 if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) {
692 pa_log_warn("Unable to register mixer: %s", snd_strerror(err));
696 if ((err = snd_mixer_load(mixer)) < 0) {
697 pa_log_warn("Unable to load mixer: %s", snd_strerror(err));
701 pa_log_info("Successfully attached to mixer '%s'", dev);
706 snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback) {
707 snd_mixer_elem_t *elem;
708 snd_mixer_selem_id_t *sid = NULL;
710 snd_mixer_selem_id_alloca(&sid);
715 snd_mixer_selem_id_set_name(sid, name);
717 if (!(elem = snd_mixer_find_selem(mixer, sid))) {
718 pa_log_info("Cannot find mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
721 snd_mixer_selem_id_set_name(sid, fallback);
723 if (!(elem = snd_mixer_find_selem(mixer, sid)))
724 pa_log_warn("Cannot find fallback mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
729 pa_log_info("Using mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
734 static const snd_mixer_selem_channel_id_t alsa_channel_ids[PA_CHANNEL_POSITION_MAX] = {
735 [PA_CHANNEL_POSITION_MONO] = SND_MIXER_SCHN_MONO, /* The ALSA name is just an alias! */
737 [PA_CHANNEL_POSITION_FRONT_CENTER] = SND_MIXER_SCHN_FRONT_CENTER,
738 [PA_CHANNEL_POSITION_FRONT_LEFT] = SND_MIXER_SCHN_FRONT_LEFT,
739 [PA_CHANNEL_POSITION_FRONT_RIGHT] = SND_MIXER_SCHN_FRONT_RIGHT,
741 [PA_CHANNEL_POSITION_REAR_CENTER] = SND_MIXER_SCHN_REAR_CENTER,
742 [PA_CHANNEL_POSITION_REAR_LEFT] = SND_MIXER_SCHN_REAR_LEFT,
743 [PA_CHANNEL_POSITION_REAR_RIGHT] = SND_MIXER_SCHN_REAR_RIGHT,
745 [PA_CHANNEL_POSITION_LFE] = SND_MIXER_SCHN_WOOFER,
747 [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN,
748 [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN,
750 [PA_CHANNEL_POSITION_SIDE_LEFT] = SND_MIXER_SCHN_SIDE_LEFT,
751 [PA_CHANNEL_POSITION_SIDE_RIGHT] = SND_MIXER_SCHN_SIDE_RIGHT,
753 [PA_CHANNEL_POSITION_AUX0] = SND_MIXER_SCHN_UNKNOWN,
754 [PA_CHANNEL_POSITION_AUX1] = SND_MIXER_SCHN_UNKNOWN,
755 [PA_CHANNEL_POSITION_AUX2] = SND_MIXER_SCHN_UNKNOWN,
756 [PA_CHANNEL_POSITION_AUX3] = SND_MIXER_SCHN_UNKNOWN,
757 [PA_CHANNEL_POSITION_AUX4] = SND_MIXER_SCHN_UNKNOWN,
758 [PA_CHANNEL_POSITION_AUX5] = SND_MIXER_SCHN_UNKNOWN,
759 [PA_CHANNEL_POSITION_AUX6] = SND_MIXER_SCHN_UNKNOWN,
760 [PA_CHANNEL_POSITION_AUX7] = SND_MIXER_SCHN_UNKNOWN,
761 [PA_CHANNEL_POSITION_AUX8] = SND_MIXER_SCHN_UNKNOWN,
762 [PA_CHANNEL_POSITION_AUX9] = SND_MIXER_SCHN_UNKNOWN,
763 [PA_CHANNEL_POSITION_AUX10] = SND_MIXER_SCHN_UNKNOWN,
764 [PA_CHANNEL_POSITION_AUX11] = SND_MIXER_SCHN_UNKNOWN,
765 [PA_CHANNEL_POSITION_AUX12] = SND_MIXER_SCHN_UNKNOWN,
766 [PA_CHANNEL_POSITION_AUX13] = SND_MIXER_SCHN_UNKNOWN,
767 [PA_CHANNEL_POSITION_AUX14] = SND_MIXER_SCHN_UNKNOWN,
768 [PA_CHANNEL_POSITION_AUX15] = SND_MIXER_SCHN_UNKNOWN,
769 [PA_CHANNEL_POSITION_AUX16] = SND_MIXER_SCHN_UNKNOWN,
770 [PA_CHANNEL_POSITION_AUX17] = SND_MIXER_SCHN_UNKNOWN,
771 [PA_CHANNEL_POSITION_AUX18] = SND_MIXER_SCHN_UNKNOWN,
772 [PA_CHANNEL_POSITION_AUX19] = SND_MIXER_SCHN_UNKNOWN,
773 [PA_CHANNEL_POSITION_AUX20] = SND_MIXER_SCHN_UNKNOWN,
774 [PA_CHANNEL_POSITION_AUX21] = SND_MIXER_SCHN_UNKNOWN,
775 [PA_CHANNEL_POSITION_AUX22] = SND_MIXER_SCHN_UNKNOWN,
776 [PA_CHANNEL_POSITION_AUX23] = SND_MIXER_SCHN_UNKNOWN,
777 [PA_CHANNEL_POSITION_AUX24] = SND_MIXER_SCHN_UNKNOWN,
778 [PA_CHANNEL_POSITION_AUX25] = SND_MIXER_SCHN_UNKNOWN,
779 [PA_CHANNEL_POSITION_AUX26] = SND_MIXER_SCHN_UNKNOWN,
780 [PA_CHANNEL_POSITION_AUX27] = SND_MIXER_SCHN_UNKNOWN,
781 [PA_CHANNEL_POSITION_AUX28] = SND_MIXER_SCHN_UNKNOWN,
782 [PA_CHANNEL_POSITION_AUX29] = SND_MIXER_SCHN_UNKNOWN,
783 [PA_CHANNEL_POSITION_AUX30] = SND_MIXER_SCHN_UNKNOWN,
784 [PA_CHANNEL_POSITION_AUX31] = SND_MIXER_SCHN_UNKNOWN,
786 [PA_CHANNEL_POSITION_TOP_CENTER] = SND_MIXER_SCHN_UNKNOWN,
788 [PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = SND_MIXER_SCHN_UNKNOWN,
789 [PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = SND_MIXER_SCHN_UNKNOWN,
790 [PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = SND_MIXER_SCHN_UNKNOWN,
792 [PA_CHANNEL_POSITION_TOP_REAR_CENTER] = SND_MIXER_SCHN_UNKNOWN,
793 [PA_CHANNEL_POSITION_TOP_REAR_LEFT] = SND_MIXER_SCHN_UNKNOWN,
794 [PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = SND_MIXER_SCHN_UNKNOWN
798 int pa_alsa_calc_mixer_map(snd_mixer_elem_t *elem, const pa_channel_map *channel_map, snd_mixer_selem_channel_id_t mixer_map[], pa_bool_t playback) {
800 pa_bool_t alsa_channel_used[SND_MIXER_SCHN_LAST];
801 pa_bool_t mono_used = FALSE;
804 pa_assert(channel_map);
805 pa_assert(mixer_map);
807 memset(&alsa_channel_used, 0, sizeof(alsa_channel_used));
809 if (channel_map->channels > 1 &&
810 ((playback && snd_mixer_selem_has_playback_volume_joined(elem)) ||
811 (!playback && snd_mixer_selem_has_capture_volume_joined(elem)))) {
812 pa_log_info("ALSA device lacks independant volume controls for each channel.");
816 for (i = 0; i < channel_map->channels; i++) {
817 snd_mixer_selem_channel_id_t id;
820 is_mono = channel_map->map[i] == PA_CHANNEL_POSITION_MONO;
821 id = alsa_channel_ids[channel_map->map[i]];
823 if (!is_mono && id == SND_MIXER_SCHN_UNKNOWN) {
824 pa_log_info("Configured channel map contains channel '%s' that is unknown to the ALSA mixer.", pa_channel_position_to_string(channel_map->map[i]));
828 if ((is_mono && mono_used) || (!is_mono && alsa_channel_used[id])) {
829 pa_log_info("Channel map has duplicate channel '%s', falling back to software volume control.", pa_channel_position_to_string(channel_map->map[i]));
833 if ((playback && (!snd_mixer_selem_has_playback_channel(elem, id) || (is_mono && !snd_mixer_selem_is_playback_mono(elem)))) ||
834 (!playback && (!snd_mixer_selem_has_capture_channel(elem, id) || (is_mono && !snd_mixer_selem_is_capture_mono(elem))))) {
836 pa_log_info("ALSA device lacks separate volumes control for channel '%s'", pa_channel_position_to_string(channel_map->map[i]));
841 mixer_map[i] = SND_MIXER_SCHN_MONO;
845 alsa_channel_used[id] = TRUE;
849 pa_log_info("All %u channels can be mapped to mixer channels.", channel_map->channels);
854 void pa_alsa_dump(snd_pcm_t *pcm) {
860 pa_assert_se(snd_output_buffer_open(&out) == 0);
862 if ((err = snd_pcm_dump(pcm, out)) < 0)
863 pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err));
866 snd_output_buffer_string(out, &s);
867 pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s));
870 pa_assert_se(snd_output_close(out) == 0);
873 void pa_alsa_dump_status(snd_pcm_t *pcm) {
876 snd_pcm_status_t *status;
880 snd_pcm_status_alloca(&status);
882 pa_assert_se(snd_output_buffer_open(&out) == 0);
884 pa_assert_se(snd_pcm_status(pcm, status) == 0);
886 if ((err = snd_pcm_status_dump(status, out)) < 0)
887 pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err));
890 snd_output_buffer_string(out, &s);
891 pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s));
894 pa_assert_se(snd_output_close(out) == 0);
897 static void alsa_error_handler(const char *file, int line, const char *function, int err, const char *fmt,...) {
902 pa_log_levelv_meta(PA_LOG_WARN, file, line, function, fmt, ap);
907 static pa_atomic_t n_error_handler_installed = PA_ATOMIC_INIT(0);
909 void pa_alsa_redirect_errors_inc(void) {
910 /* This is not really thread safe, but we do our best */
912 if (pa_atomic_inc(&n_error_handler_installed) == 0)
913 snd_lib_error_set_handler(alsa_error_handler);
916 void pa_alsa_redirect_errors_dec(void) {
919 pa_assert_se((r = pa_atomic_dec(&n_error_handler_installed)) >= 1);
922 snd_lib_error_set_handler(NULL);
925 void pa_alsa_init_proplist(pa_proplist *p, snd_pcm_info_t *pcm_info) {
927 static const char * const alsa_class_table[SND_PCM_CLASS_LAST+1] = {
928 [SND_PCM_CLASS_GENERIC] = "generic",
929 [SND_PCM_CLASS_MULTI] = "multi",
930 [SND_PCM_CLASS_MODEM] = "modem",
931 [SND_PCM_CLASS_DIGITIZER] = "digitizer"
933 static const char * const class_table[SND_PCM_CLASS_LAST+1] = {
934 [SND_PCM_CLASS_GENERIC] = "sound",
935 [SND_PCM_CLASS_MULTI] = NULL,
936 [SND_PCM_CLASS_MODEM] = "modem",
937 [SND_PCM_CLASS_DIGITIZER] = NULL
939 static const char * const alsa_subclass_table[SND_PCM_SUBCLASS_LAST+1] = {
940 [SND_PCM_SUBCLASS_GENERIC_MIX] = "generic-mix",
941 [SND_PCM_SUBCLASS_MULTI_MIX] = "multi-mix"
944 snd_pcm_class_t class;
945 snd_pcm_subclass_t subclass;
946 const char *n, *id, *sdn;
947 char *cn = NULL, *lcn = NULL;
953 pa_proplist_sets(p, PA_PROP_DEVICE_API, "alsa");
955 class = snd_pcm_info_get_class(pcm_info);
956 if (class <= SND_PCM_CLASS_LAST) {
957 if (class_table[class])
958 pa_proplist_sets(p, PA_PROP_DEVICE_CLASS, class_table[class]);
959 if (alsa_class_table[class])
960 pa_proplist_sets(p, "alsa.class", alsa_class_table[class]);
962 subclass = snd_pcm_info_get_subclass(pcm_info);
963 if (subclass <= SND_PCM_SUBCLASS_LAST)
964 if (alsa_subclass_table[subclass])
965 pa_proplist_sets(p, "alsa.subclass", alsa_subclass_table[subclass]);
967 if ((n = snd_pcm_info_get_name(pcm_info)))
968 pa_proplist_sets(p, "alsa.name", n);
970 if ((id = snd_pcm_info_get_id(pcm_info)))
971 pa_proplist_sets(p, "alsa.id", id);
973 pa_proplist_setf(p, "alsa.subdevice", "%u", snd_pcm_info_get_subdevice(pcm_info));
974 if ((sdn = snd_pcm_info_get_subdevice_name(pcm_info)))
975 pa_proplist_sets(p, "alsa.subdevice_name", sdn);
977 pa_proplist_setf(p, "alsa.device", "%u", snd_pcm_info_get_device(pcm_info));
979 if ((card = snd_pcm_info_get_card(pcm_info)) >= 0) {
980 pa_proplist_setf(p, "alsa.card", "%i", card);
982 if (snd_card_get_name(card, &cn) >= 0)
983 pa_proplist_sets(p, "alsa.card_name", cn);
985 if (snd_card_get_longname(card, &lcn) >= 0)
986 pa_proplist_sets(p, "alsa.long_card_name", lcn);
990 pa_proplist_setf(p, PA_PROP_DEVICE_DESCRIPTION, "%s - %s", cn, n);
992 pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, cn);
994 pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, n);
1000 int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents) {
1001 snd_pcm_state_t state;
1006 if (revents & POLLERR)
1007 pa_log_warn("Got POLLERR from ALSA");
1008 if (revents & POLLNVAL)
1009 pa_log_warn("Got POLLNVAL from ALSA");
1010 if (revents & POLLHUP)
1011 pa_log_warn("Got POLLHUP from ALSA");
1013 state = snd_pcm_state(pcm);
1014 pa_log_warn("PCM state is %s", snd_pcm_state_name(state));
1016 /* Try to recover from this error */
1020 case SND_PCM_STATE_XRUN:
1021 if ((err = snd_pcm_recover(pcm, -EPIPE, 1)) != 0) {
1022 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and XRUN: %s", snd_strerror(err));
1027 case SND_PCM_STATE_SUSPENDED:
1028 if ((err = snd_pcm_recover(pcm, -ESTRPIPE, 1)) != 0) {
1029 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and SUSPENDED: %s", snd_strerror(err));
1038 if ((err = snd_pcm_prepare(pcm)) < 0) {
1039 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): %s", snd_strerror(err));
1048 pa_rtpoll_item* pa_alsa_build_pollfd(snd_pcm_t *pcm, pa_rtpoll *rtpoll) {
1050 struct pollfd *pollfd;
1051 pa_rtpoll_item *item;
1055 if ((n = snd_pcm_poll_descriptors_count(pcm)) < 0) {
1056 pa_log("snd_pcm_poll_descriptors_count() failed: %s", snd_strerror(n));
1060 item = pa_rtpoll_item_new(rtpoll, PA_RTPOLL_NEVER, (unsigned) n);
1061 pollfd = pa_rtpoll_item_get_pollfd(item, NULL);
1063 if ((err = snd_pcm_poll_descriptors(pcm, pollfd, (unsigned) n)) < 0) {
1064 pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err));
1065 pa_rtpoll_item_free(item);
1072 pa_cvolume *pa_alsa_volume_divide(pa_cvolume *r, const pa_cvolume *t) {
1077 pa_assert(r->channels == t->channels);
1079 for (i = 0; i < r->channels; i++) {
1082 a = pa_sw_volume_to_linear(r->values[i]); /* the hw volume */
1083 b = pa_sw_volume_to_linear(t->values[i]); /* the intended volume */
1090 r->values[i] = pa_sw_volume_from_linear(c);