4 This file is part of PulseAudio.
6 Copyright 2004-2006 Lennart Poettering
7 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
9 PulseAudio is free software; you can redistribute it and/or modify
10 it under the terms of the GNU Lesser General Public License as published
11 by the Free Software Foundation; either version 2 of the License,
12 or (at your option) any later version.
14 PulseAudio is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public License
20 along with PulseAudio; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
29 #include <sys/types.h>
31 #include <asoundlib.h>
33 #include <pulse/sample.h>
34 #include <pulse/xmalloc.h>
36 #include <pulsecore/log.h>
37 #include <pulsecore/macro.h>
38 #include <pulsecore/core-util.h>
39 #include <pulsecore/atomic.h>
41 #include "alsa-util.h"
43 struct pa_alsa_fdlist {
46 /* This is a temporary buffer used to avoid lots of mallocs */
47 struct pollfd *work_fds;
52 pa_defer_event *defer;
57 void (*cb)(void *userdata);
61 static void io_cb(pa_mainloop_api*a, pa_io_event* e, PA_GCC_UNUSED int fd, pa_io_event_flags_t events, void *userdata) {
63 struct pa_alsa_fdlist *fdl = userdata;
65 unsigned short revents;
69 pa_assert(fdl->mixer);
71 pa_assert(fdl->work_fds);
78 memcpy(fdl->work_fds, fdl->fds, sizeof(struct pollfd) * fdl->num_fds);
80 for (i = 0;i < fdl->num_fds; i++) {
81 if (e == fdl->ios[i]) {
82 if (events & PA_IO_EVENT_INPUT)
83 fdl->work_fds[i].revents |= POLLIN;
84 if (events & PA_IO_EVENT_OUTPUT)
85 fdl->work_fds[i].revents |= POLLOUT;
86 if (events & PA_IO_EVENT_ERROR)
87 fdl->work_fds[i].revents |= POLLERR;
88 if (events & PA_IO_EVENT_HANGUP)
89 fdl->work_fds[i].revents |= POLLHUP;
94 pa_assert(i != fdl->num_fds);
96 if ((err = snd_mixer_poll_descriptors_revents(fdl->mixer, fdl->work_fds, fdl->num_fds, &revents)) < 0) {
97 pa_log_error("Unable to get poll revent: %s", snd_strerror(err));
101 a->defer_enable(fdl->defer, 1);
104 snd_mixer_handle_events(fdl->mixer);
107 static void defer_cb(pa_mainloop_api*a, PA_GCC_UNUSED pa_defer_event* e, void *userdata) {
108 struct pa_alsa_fdlist *fdl = userdata;
114 pa_assert(fdl->mixer);
116 a->defer_enable(fdl->defer, 0);
118 num_fds = snd_mixer_poll_descriptors_count(fdl->mixer);
119 pa_assert(num_fds > 0);
121 if (num_fds != fdl->num_fds) {
125 pa_xfree(fdl->work_fds);
126 fdl->fds = pa_xnew0(struct pollfd, num_fds);
127 fdl->work_fds = pa_xnew(struct pollfd, num_fds);
130 memset(fdl->work_fds, 0, sizeof(struct pollfd) * num_fds);
132 if ((err = snd_mixer_poll_descriptors(fdl->mixer, fdl->work_fds, num_fds)) < 0) {
133 pa_log_error("Unable to get poll descriptors: %s", snd_strerror(err));
139 if (memcmp(fdl->fds, fdl->work_fds, sizeof(struct pollfd) * num_fds) == 0)
143 for (i = 0; i < fdl->num_fds; i++)
144 a->io_free(fdl->ios[i]);
146 if (num_fds != fdl->num_fds) {
153 fdl->ios = pa_xnew(pa_io_event*, num_fds);
156 temp = fdl->work_fds;
157 fdl->work_fds = fdl->fds;
160 fdl->num_fds = num_fds;
162 for (i = 0;i < num_fds;i++)
163 fdl->ios[i] = a->io_new(a, fdl->fds[i].fd,
164 ((fdl->fds[i].events & POLLIN) ? PA_IO_EVENT_INPUT : 0) |
165 ((fdl->fds[i].events & POLLOUT) ? PA_IO_EVENT_OUTPUT : 0),
169 struct pa_alsa_fdlist *pa_alsa_fdlist_new(void) {
170 struct pa_alsa_fdlist *fdl;
172 fdl = pa_xnew0(struct pa_alsa_fdlist, 1);
176 fdl->work_fds = NULL;
186 void pa_alsa_fdlist_free(struct pa_alsa_fdlist *fdl) {
191 fdl->m->defer_free(fdl->defer);
197 for (i = 0;i < fdl->num_fds;i++)
198 fdl->m->io_free(fdl->ios[i]);
205 pa_xfree(fdl->work_fds);
210 int pa_alsa_fdlist_set_mixer(struct pa_alsa_fdlist *fdl, snd_mixer_t *mixer_handle, pa_mainloop_api* m) {
212 pa_assert(mixer_handle);
216 fdl->mixer = mixer_handle;
218 fdl->defer = m->defer_new(m, defer_cb, fdl);
223 static int set_format(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, pa_sample_format_t *f) {
225 static const snd_pcm_format_t format_trans[] = {
226 [PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
227 [PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
228 [PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW,
229 [PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE,
230 [PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE,
231 [PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
232 [PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
233 [PA_SAMPLE_S32LE] = SND_PCM_FORMAT_S32_LE,
234 [PA_SAMPLE_S32BE] = SND_PCM_FORMAT_S32_BE,
237 static const pa_sample_format_t try_order[] = {
252 pa_assert(pcm_handle);
255 if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
258 if (*f == PA_SAMPLE_FLOAT32BE)
259 *f = PA_SAMPLE_FLOAT32LE;
260 else if (*f == PA_SAMPLE_FLOAT32LE)
261 *f = PA_SAMPLE_FLOAT32BE;
262 else if (*f == PA_SAMPLE_S16BE)
263 *f = PA_SAMPLE_S16LE;
264 else if (*f == PA_SAMPLE_S16LE)
265 *f = PA_SAMPLE_S16BE;
266 else if (*f == PA_SAMPLE_S32BE)
267 *f = PA_SAMPLE_S32LE;
268 else if (*f == PA_SAMPLE_S32LE)
269 *f = PA_SAMPLE_S32BE;
273 if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
278 for (i = 0; try_order[i] != PA_SAMPLE_INVALID; i++) {
281 if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
288 /* Set the hardware parameters of the given ALSA device. Returns the
289 * selected fragment settings in *period and *period_size */
290 int pa_alsa_set_hw_params(
291 snd_pcm_t *pcm_handle,
294 snd_pcm_uframes_t *period_size,
295 snd_pcm_uframes_t tsched_size,
297 pa_bool_t *use_tsched,
298 pa_bool_t require_exact_channel_number) {
301 snd_pcm_uframes_t _period_size = *period_size;
302 unsigned int _periods = *periods;
303 snd_pcm_uframes_t buffer_size;
304 unsigned int r = ss->rate;
305 unsigned int c = ss->channels;
306 pa_sample_format_t f = ss->format;
307 snd_pcm_hw_params_t *hwparams;
308 pa_bool_t _use_mmap = use_mmap && *use_mmap;
309 pa_bool_t _use_tsched = use_tsched && *use_tsched;
312 pa_assert(pcm_handle);
315 pa_assert(period_size);
317 snd_pcm_hw_params_alloca(&hwparams);
319 if ((ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0)
322 if ((ret = snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, 0)) < 0)
326 if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_INTERLEAVED)) < 0) {
328 /* mmap() didn't work, fall back to interleaved */
330 if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
336 } else if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
342 if ((ret = set_format(pcm_handle, hwparams, &f)) < 0)
345 if ((ret = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &r, NULL)) < 0)
348 /* Adjust the buffer sizes, if we didn't get the rate we were asking for */
349 _period_size = (snd_pcm_uframes_t) (((uint64_t) _period_size * r) / ss->rate);
350 tsched_size = (snd_pcm_uframes_t) (((uint64_t) tsched_size * r) / ss->rate);
352 if (require_exact_channel_number) {
353 if ((ret = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, c)) < 0)
356 if ((ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0)
361 _period_size = tsched_size;
364 pa_assert_se(snd_pcm_hw_params_get_buffer_size_max(hwparams, &buffer_size) == 0);
365 pa_log_debug("Maximum hw buffer size is %u ms", (unsigned) buffer_size * 1000 / r);
368 buffer_size = _periods * _period_size;
370 if ((ret = snd_pcm_hw_params_set_periods_integer(pcm_handle, hwparams)) < 0)
375 if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0) {
377 if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0)
382 if (_period_size > 0)
383 if ((ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size)) < 0)
386 if ((ret = snd_pcm_hw_params(pcm_handle, hwparams)) < 0)
390 pa_log_warn("Device %s doesn't support %u Hz, changed to %u Hz.", snd_pcm_name(pcm_handle), ss->rate, r);
392 if (ss->channels != c)
393 pa_log_warn("Device %s doesn't support %u channels, changed to %u.", snd_pcm_name(pcm_handle), ss->channels, c);
396 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));
398 if ((ret = snd_pcm_prepare(pcm_handle)) < 0)
401 if ((ret = snd_pcm_hw_params_get_period_size(hwparams, &_period_size, &dir)) < 0 ||
402 (ret = snd_pcm_hw_params_get_periods(hwparams, &_periods, &dir)) < 0)
405 /* If the sample rate deviates too much, we need to resample */
406 if (r < ss->rate*.95 || r > ss->rate*1.05)
411 pa_assert(_periods > 0);
412 pa_assert(_period_size > 0);
415 *period_size = _period_size;
418 *use_mmap = _use_mmap;
421 *use_tsched = _use_tsched;
430 int pa_alsa_set_sw_params(snd_pcm_t *pcm, snd_pcm_uframes_t avail_min) {
431 snd_pcm_sw_params_t *swparams;
436 snd_pcm_sw_params_alloca(&swparams);
438 if ((err = snd_pcm_sw_params_current(pcm, swparams) < 0)) {
439 pa_log_warn("Unable to determine current swparams: %s\n", snd_strerror(err));
443 if ((err = snd_pcm_sw_params_set_stop_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) {
444 pa_log_warn("Unable to set stop threshold: %s\n", snd_strerror(err));
448 if ((err = snd_pcm_sw_params_set_start_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) {
449 pa_log_warn("Unable to set start threshold: %s\n", snd_strerror(err));
453 if ((err = snd_pcm_sw_params_set_avail_min(pcm, swparams, avail_min)) < 0) {
454 pa_log_error("snd_pcm_sw_params_set_avail_min() failed: %s", snd_strerror(err));
458 if ((err = snd_pcm_sw_params(pcm, swparams)) < 0) {
459 pa_log_warn("Unable to set sw params: %s\n", snd_strerror(err));
471 static const struct device_info device_table[] = {
472 {{ 2, { PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT } }, "front" },
474 {{ 4, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
475 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT }}, "surround40" },
477 {{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
478 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
479 PA_CHANNEL_POSITION_LFE }}, "surround41" },
481 {{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
482 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
483 PA_CHANNEL_POSITION_CENTER }}, "surround50" },
485 {{ 6, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
486 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
487 PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE }}, "surround51" },
489 {{ 8, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
490 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
491 PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE,
492 PA_CHANNEL_POSITION_SIDE_LEFT, PA_CHANNEL_POSITION_SIDE_RIGHT }} , "surround71" },
497 static pa_bool_t channel_map_superset(const pa_channel_map *a, const pa_channel_map *b) {
498 pa_bool_t in_a[PA_CHANNEL_POSITION_MAX];
504 memset(in_a, 0, sizeof(in_a));
506 for (i = 0; i < a->channels; i++)
507 in_a[a->map[i]] = TRUE;
509 for (i = 0; i < b->channels; i++)
510 if (!in_a[b->map[i]])
516 snd_pcm_t *pa_alsa_open_by_device_id(
523 snd_pcm_uframes_t *period_size,
524 snd_pcm_uframes_t tsched_size,
526 pa_bool_t *use_tsched) {
532 snd_pcm_t *pcm_handle;
539 pa_assert(period_size);
541 /* First we try to find a device string with a superset of the
542 * requested channel map and open it without the plug: prefix. We
543 * iterate through our device table from top to bottom and take
544 * the first that matches. If we didn't find a working device that
545 * way, we iterate backwards, and check all devices that do not
546 * provide a superset of the requested channel map.*/
548 for (i = 0;; i += direction) {
549 pa_sample_spec try_ss;
552 pa_assert(direction == -1);
554 /* OK, so we iterated backwards, and now are at the
555 * beginning of our list. */
559 } else if (!device_table[i].name) {
560 pa_assert(direction == 1);
562 /* OK, so we are at the end of our list. at iterated
569 if ((direction > 0) == !channel_map_superset(&device_table[i].map, map))
572 d = pa_sprintf_malloc("%s:%s", device_table[i].name, dev_id);
573 pa_log_debug("Trying %s...", d);
575 if ((err = snd_pcm_open(&pcm_handle, d, mode,
577 SND_PCM_NO_AUTO_RESAMPLE|
578 SND_PCM_NO_AUTO_CHANNELS|
579 SND_PCM_NO_AUTO_FORMAT)) < 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 if (!pa_channel_map_init_auto(map, ss->channels, PA_CHANNEL_MAP_ALSA)) {
676 pa_channel_position_t pos;
678 pa_log_warn("Device has an unknown channel mapping. This is a limitation of ALSA. Synthesizing channel map.");
680 for (c = ss->channels; c > 0; c--)
681 if (pa_channel_map_init_auto(map, c, PA_CHANNEL_MAP_ALSA))
686 pos = PA_CHANNEL_POSITION_AUX0;
687 for (; c < map->channels; c ++)
690 map->channels = ss->channels;
698 int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev) {
704 if ((err = snd_mixer_attach(mixer, dev)) < 0) {
705 pa_log_info("Unable to attach to mixer %s: %s", dev, snd_strerror(err));
709 if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) {
710 pa_log_warn("Unable to register mixer: %s", snd_strerror(err));
714 if ((err = snd_mixer_load(mixer)) < 0) {
715 pa_log_warn("Unable to load mixer: %s", snd_strerror(err));
719 pa_log_info("Successfully attached to mixer '%s'", dev);
724 snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback) {
725 snd_mixer_elem_t *elem;
726 snd_mixer_selem_id_t *sid = NULL;
728 snd_mixer_selem_id_alloca(&sid);
733 snd_mixer_selem_id_set_name(sid, name);
735 if (!(elem = snd_mixer_find_selem(mixer, sid))) {
736 pa_log_info("Cannot find mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
739 snd_mixer_selem_id_set_name(sid, fallback);
741 if (!(elem = snd_mixer_find_selem(mixer, sid)))
742 pa_log_warn("Cannot find fallback mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
747 pa_log_info("Using mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
752 static const snd_mixer_selem_channel_id_t alsa_channel_ids[PA_CHANNEL_POSITION_MAX] = {
753 [PA_CHANNEL_POSITION_MONO] = SND_MIXER_SCHN_MONO, /* The ALSA name is just an alias! */
755 [PA_CHANNEL_POSITION_FRONT_CENTER] = SND_MIXER_SCHN_FRONT_CENTER,
756 [PA_CHANNEL_POSITION_FRONT_LEFT] = SND_MIXER_SCHN_FRONT_LEFT,
757 [PA_CHANNEL_POSITION_FRONT_RIGHT] = SND_MIXER_SCHN_FRONT_RIGHT,
759 [PA_CHANNEL_POSITION_REAR_CENTER] = SND_MIXER_SCHN_REAR_CENTER,
760 [PA_CHANNEL_POSITION_REAR_LEFT] = SND_MIXER_SCHN_REAR_LEFT,
761 [PA_CHANNEL_POSITION_REAR_RIGHT] = SND_MIXER_SCHN_REAR_RIGHT,
763 [PA_CHANNEL_POSITION_LFE] = SND_MIXER_SCHN_WOOFER,
765 [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN,
766 [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN,
768 [PA_CHANNEL_POSITION_SIDE_LEFT] = SND_MIXER_SCHN_SIDE_LEFT,
769 [PA_CHANNEL_POSITION_SIDE_RIGHT] = SND_MIXER_SCHN_SIDE_RIGHT,
771 [PA_CHANNEL_POSITION_AUX0] = SND_MIXER_SCHN_UNKNOWN,
772 [PA_CHANNEL_POSITION_AUX1] = SND_MIXER_SCHN_UNKNOWN,
773 [PA_CHANNEL_POSITION_AUX2] = SND_MIXER_SCHN_UNKNOWN,
774 [PA_CHANNEL_POSITION_AUX3] = SND_MIXER_SCHN_UNKNOWN,
775 [PA_CHANNEL_POSITION_AUX4] = SND_MIXER_SCHN_UNKNOWN,
776 [PA_CHANNEL_POSITION_AUX5] = SND_MIXER_SCHN_UNKNOWN,
777 [PA_CHANNEL_POSITION_AUX6] = SND_MIXER_SCHN_UNKNOWN,
778 [PA_CHANNEL_POSITION_AUX7] = SND_MIXER_SCHN_UNKNOWN,
779 [PA_CHANNEL_POSITION_AUX8] = SND_MIXER_SCHN_UNKNOWN,
780 [PA_CHANNEL_POSITION_AUX9] = SND_MIXER_SCHN_UNKNOWN,
781 [PA_CHANNEL_POSITION_AUX10] = SND_MIXER_SCHN_UNKNOWN,
782 [PA_CHANNEL_POSITION_AUX11] = SND_MIXER_SCHN_UNKNOWN,
783 [PA_CHANNEL_POSITION_AUX12] = SND_MIXER_SCHN_UNKNOWN,
784 [PA_CHANNEL_POSITION_AUX13] = SND_MIXER_SCHN_UNKNOWN,
785 [PA_CHANNEL_POSITION_AUX14] = SND_MIXER_SCHN_UNKNOWN,
786 [PA_CHANNEL_POSITION_AUX15] = SND_MIXER_SCHN_UNKNOWN,
787 [PA_CHANNEL_POSITION_AUX16] = SND_MIXER_SCHN_UNKNOWN,
788 [PA_CHANNEL_POSITION_AUX17] = SND_MIXER_SCHN_UNKNOWN,
789 [PA_CHANNEL_POSITION_AUX18] = SND_MIXER_SCHN_UNKNOWN,
790 [PA_CHANNEL_POSITION_AUX19] = SND_MIXER_SCHN_UNKNOWN,
791 [PA_CHANNEL_POSITION_AUX20] = SND_MIXER_SCHN_UNKNOWN,
792 [PA_CHANNEL_POSITION_AUX21] = SND_MIXER_SCHN_UNKNOWN,
793 [PA_CHANNEL_POSITION_AUX22] = SND_MIXER_SCHN_UNKNOWN,
794 [PA_CHANNEL_POSITION_AUX23] = SND_MIXER_SCHN_UNKNOWN,
795 [PA_CHANNEL_POSITION_AUX24] = SND_MIXER_SCHN_UNKNOWN,
796 [PA_CHANNEL_POSITION_AUX25] = SND_MIXER_SCHN_UNKNOWN,
797 [PA_CHANNEL_POSITION_AUX26] = SND_MIXER_SCHN_UNKNOWN,
798 [PA_CHANNEL_POSITION_AUX27] = SND_MIXER_SCHN_UNKNOWN,
799 [PA_CHANNEL_POSITION_AUX28] = SND_MIXER_SCHN_UNKNOWN,
800 [PA_CHANNEL_POSITION_AUX29] = SND_MIXER_SCHN_UNKNOWN,
801 [PA_CHANNEL_POSITION_AUX30] = SND_MIXER_SCHN_UNKNOWN,
802 [PA_CHANNEL_POSITION_AUX31] = SND_MIXER_SCHN_UNKNOWN,
804 [PA_CHANNEL_POSITION_TOP_CENTER] = SND_MIXER_SCHN_UNKNOWN,
806 [PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = SND_MIXER_SCHN_UNKNOWN,
807 [PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = SND_MIXER_SCHN_UNKNOWN,
808 [PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = SND_MIXER_SCHN_UNKNOWN,
810 [PA_CHANNEL_POSITION_TOP_REAR_CENTER] = SND_MIXER_SCHN_UNKNOWN,
811 [PA_CHANNEL_POSITION_TOP_REAR_LEFT] = SND_MIXER_SCHN_UNKNOWN,
812 [PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = SND_MIXER_SCHN_UNKNOWN
816 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) {
818 pa_bool_t alsa_channel_used[SND_MIXER_SCHN_LAST];
819 pa_bool_t mono_used = FALSE;
822 pa_assert(channel_map);
823 pa_assert(mixer_map);
825 memset(&alsa_channel_used, 0, sizeof(alsa_channel_used));
827 if (channel_map->channels > 1 &&
828 ((playback && snd_mixer_selem_has_playback_volume_joined(elem)) ||
829 (!playback && snd_mixer_selem_has_capture_volume_joined(elem)))) {
830 pa_log_info("ALSA device lacks independant volume controls for each channel, falling back to software volume control.");
834 for (i = 0; i < channel_map->channels; i++) {
835 snd_mixer_selem_channel_id_t id;
838 is_mono = channel_map->map[i] == PA_CHANNEL_POSITION_MONO;
839 id = alsa_channel_ids[channel_map->map[i]];
841 if (!is_mono && id == SND_MIXER_SCHN_UNKNOWN) {
842 pa_log_info("Configured channel map contains channel '%s' that is unknown to the ALSA mixer. Falling back to software volume control.", pa_channel_position_to_string(channel_map->map[i]));
846 if ((is_mono && mono_used) || (!is_mono && alsa_channel_used[id])) {
847 pa_log_info("Channel map has duplicate channel '%s', falling back to software volume control.", pa_channel_position_to_string(channel_map->map[i]));
851 if ((playback && (!snd_mixer_selem_has_playback_channel(elem, id) || (is_mono && !snd_mixer_selem_is_playback_mono(elem)))) ||
852 (!playback && (!snd_mixer_selem_has_capture_channel(elem, id) || (is_mono && !snd_mixer_selem_is_capture_mono(elem))))) {
854 pa_log_info("ALSA device lacks separate volumes control for channel '%s', falling back to software volume control.", pa_channel_position_to_string(channel_map->map[i]));
859 mixer_map[i] = SND_MIXER_SCHN_MONO;
863 alsa_channel_used[id] = TRUE;
867 pa_log_info("All %u channels can be mapped to mixer channels.", channel_map->channels);
872 void pa_alsa_0dB_playback(snd_mixer_elem_t *elem) {
877 /* Try to enable 0 dB if possible. If ALSA cannot do dB, then use
878 * raw volume levels and fix them to 75% */
880 if (snd_mixer_selem_set_playback_dB_all(elem, 0, -1) >= 0)
883 if (snd_mixer_selem_set_playback_dB_all(elem, 0, 1) >= 0)
886 if (snd_mixer_selem_get_playback_volume_range(elem, &min, &max) < 0)
889 v = min + ((max - min) * 3) / 4; /* 75% */
894 snd_mixer_selem_set_playback_volume_all(elem, v);
897 void pa_alsa_0dB_capture(snd_mixer_elem_t *elem) {
902 /* Try to enable 0 dB if possible. If ALSA cannot do dB, then use
903 * raw volume levels and fix them to 75% */
905 if (snd_mixer_selem_set_capture_dB_all(elem, 0, -1) >= 0)
908 if (snd_mixer_selem_set_capture_dB_all(elem, 0, 1) >= 0)
911 if (snd_mixer_selem_get_capture_volume_range(elem, &min, &max) < 0)
914 v = min + ((max - min) * 3) / 4; /* 75% */
919 snd_mixer_selem_set_capture_volume_all(elem, v);
922 void pa_alsa_dump(snd_pcm_t *pcm) {
928 pa_assert_se(snd_output_buffer_open(&out) == 0);
930 if ((err = snd_pcm_dump(pcm, out)) < 0)
931 pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err));
934 snd_output_buffer_string(out, &s);
935 pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s));
938 pa_assert_se(snd_output_close(out) == 0);
941 void pa_alsa_dump_status(snd_pcm_t *pcm) {
944 snd_pcm_status_t *status;
948 snd_pcm_status_alloca(&status);
950 pa_assert_se(snd_output_buffer_open(&out) == 0);
952 pa_assert_se(snd_pcm_status(pcm, status) == 0);
954 if ((err = snd_pcm_status_dump(status, out)) < 0)
955 pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err));
958 snd_output_buffer_string(out, &s);
959 pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s));
962 pa_assert_se(snd_output_close(out) == 0);
965 static void alsa_error_handler(const char *file, int line, const char *function, int err, const char *fmt,...) {
970 pa_log_levelv_meta(PA_LOG_WARN, file, line, function, fmt, ap);
975 static pa_atomic_t n_error_handler_installed = PA_ATOMIC_INIT(0);
977 void pa_alsa_redirect_errors_inc(void) {
978 /* This is not really thread safe, but we do our best */
980 if (pa_atomic_inc(&n_error_handler_installed) == 0)
981 snd_lib_error_set_handler(alsa_error_handler);
984 void pa_alsa_redirect_errors_dec(void) {
987 pa_assert_se((r = pa_atomic_dec(&n_error_handler_installed)) >= 1);
990 snd_lib_error_set_handler(NULL);
993 void pa_alsa_init_proplist(pa_proplist *p, snd_pcm_info_t *pcm_info) {
995 static const char * const alsa_class_table[SND_PCM_CLASS_LAST+1] = {
996 [SND_PCM_CLASS_GENERIC] = "generic",
997 [SND_PCM_CLASS_MULTI] = "multi",
998 [SND_PCM_CLASS_MODEM] = "modem",
999 [SND_PCM_CLASS_DIGITIZER] = "digitizer"
1001 static const char * const class_table[SND_PCM_CLASS_LAST+1] = {
1002 [SND_PCM_CLASS_GENERIC] = "sound",
1003 [SND_PCM_CLASS_MULTI] = NULL,
1004 [SND_PCM_CLASS_MODEM] = "modem",
1005 [SND_PCM_CLASS_DIGITIZER] = NULL
1007 static const char * const alsa_subclass_table[SND_PCM_SUBCLASS_LAST+1] = {
1008 [SND_PCM_SUBCLASS_GENERIC_MIX] = "generic-mix",
1009 [SND_PCM_SUBCLASS_MULTI_MIX] = "multi-mix"
1012 snd_pcm_class_t class;
1013 snd_pcm_subclass_t subclass;
1014 const char *n, *id, *sdn;
1015 char *cn = NULL, *lcn = NULL;
1019 pa_assert(pcm_info);
1021 pa_proplist_sets(p, PA_PROP_DEVICE_API, "alsa");
1023 class = snd_pcm_info_get_class(pcm_info);
1024 if (class <= SND_PCM_CLASS_LAST) {
1025 if (class_table[class])
1026 pa_proplist_sets(p, PA_PROP_DEVICE_CLASS, class_table[class]);
1027 if (alsa_class_table[class])
1028 pa_proplist_sets(p, "alsa.class", alsa_class_table[class]);
1030 subclass = snd_pcm_info_get_subclass(pcm_info);
1031 if (subclass <= SND_PCM_SUBCLASS_LAST)
1032 if (alsa_subclass_table[subclass])
1033 pa_proplist_sets(p, "alsa.subclass", alsa_subclass_table[subclass]);
1035 if ((n = snd_pcm_info_get_name(pcm_info)))
1036 pa_proplist_sets(p, "alsa.name", n);
1038 if ((id = snd_pcm_info_get_id(pcm_info)))
1039 pa_proplist_sets(p, "alsa.id", id);
1041 pa_proplist_setf(p, "alsa.subdevice", "%u", snd_pcm_info_get_subdevice(pcm_info));
1042 if ((sdn = snd_pcm_info_get_subdevice_name(pcm_info)))
1043 pa_proplist_sets(p, "alsa.subdevice_name", sdn);
1045 pa_proplist_setf(p, "alsa.device", "%u", snd_pcm_info_get_device(pcm_info));
1047 if ((card = snd_pcm_info_get_card(pcm_info)) >= 0) {
1048 pa_proplist_setf(p, "alsa.card", "%i", card);
1050 if (snd_card_get_name(card, &cn) >= 0)
1051 pa_proplist_sets(p, "alsa.card_name", cn);
1053 if (snd_card_get_longname(card, &lcn) >= 0)
1054 pa_proplist_sets(p, "alsa.long_card_name", lcn);
1058 pa_proplist_setf(p, PA_PROP_DEVICE_DESCRIPTION, "%s - %s", cn, n);
1060 pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, cn);
1062 pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, n);
1065 int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents) {
1066 snd_pcm_state_t state;
1071 if (revents & POLLERR)
1072 pa_log_warn("Got POLLERR from ALSA");
1073 if (revents & POLLNVAL)
1074 pa_log_warn("Got POLLNVAL from ALSA");
1075 if (revents & POLLHUP)
1076 pa_log_warn("Got POLLHUP from ALSA");
1078 state = snd_pcm_state(pcm);
1079 pa_log_warn("PCM state is %s", snd_pcm_state_name(state));
1081 /* Try to recover from this error */
1085 case SND_PCM_STATE_XRUN:
1086 if ((err = snd_pcm_recover(pcm, -EPIPE, 1)) != 0) {
1087 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and XRUN: %s", snd_strerror(err));
1092 case SND_PCM_STATE_SUSPENDED:
1093 if ((err = snd_pcm_recover(pcm, -ESTRPIPE, 1)) != 0) {
1094 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and SUSPENDED: %s", snd_strerror(err));
1103 if ((err = snd_pcm_prepare(pcm)) < 0) {
1104 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): %s", snd_strerror(err));
1113 pa_rtpoll_item* pa_alsa_build_pollfd(snd_pcm_t *pcm, pa_rtpoll *rtpoll) {
1115 struct pollfd *pollfd;
1116 pa_rtpoll_item *item;
1120 if ((n = snd_pcm_poll_descriptors_count(pcm)) < 0) {
1121 pa_log("snd_pcm_poll_descriptors_count() failed: %s", snd_strerror(n));
1125 item = pa_rtpoll_item_new(rtpoll, PA_RTPOLL_NEVER, n);
1126 pollfd = pa_rtpoll_item_get_pollfd(item, NULL);
1128 if ((err = snd_pcm_poll_descriptors(pcm, pollfd, n)) < 0) {
1129 pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err));
1130 pa_rtpoll_item_free(item);