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, PA_GCC_UNUSED int fd, pa_io_event_flags_t events, void *userdata) {
61 struct pa_alsa_fdlist *fdl = userdata;
63 unsigned short revents;
67 pa_assert(fdl->mixer);
69 pa_assert(fdl->work_fds);
76 memcpy(fdl->work_fds, fdl->fds, sizeof(struct pollfd) * fdl->num_fds);
78 for (i = 0;i < fdl->num_fds; i++) {
79 if (e == fdl->ios[i]) {
80 if (events & PA_IO_EVENT_INPUT)
81 fdl->work_fds[i].revents |= POLLIN;
82 if (events & PA_IO_EVENT_OUTPUT)
83 fdl->work_fds[i].revents |= POLLOUT;
84 if (events & PA_IO_EVENT_ERROR)
85 fdl->work_fds[i].revents |= POLLERR;
86 if (events & PA_IO_EVENT_HANGUP)
87 fdl->work_fds[i].revents |= POLLHUP;
92 pa_assert(i != fdl->num_fds);
94 if ((err = snd_mixer_poll_descriptors_revents(fdl->mixer, fdl->work_fds, fdl->num_fds, &revents)) < 0) {
95 pa_log_error("Unable to get poll revent: %s", snd_strerror(err));
99 a->defer_enable(fdl->defer, 1);
102 snd_mixer_handle_events(fdl->mixer);
105 static void defer_cb(pa_mainloop_api*a, PA_GCC_UNUSED pa_defer_event* e, void *userdata) {
106 struct pa_alsa_fdlist *fdl = userdata;
112 pa_assert(fdl->mixer);
114 a->defer_enable(fdl->defer, 0);
116 num_fds = snd_mixer_poll_descriptors_count(fdl->mixer);
117 pa_assert(num_fds > 0);
119 if (num_fds != fdl->num_fds) {
123 pa_xfree(fdl->work_fds);
124 fdl->fds = pa_xnew0(struct pollfd, num_fds);
125 fdl->work_fds = pa_xnew(struct pollfd, num_fds);
128 memset(fdl->work_fds, 0, sizeof(struct pollfd) * num_fds);
130 if ((err = snd_mixer_poll_descriptors(fdl->mixer, fdl->work_fds, num_fds)) < 0) {
131 pa_log_error("Unable to get poll descriptors: %s", snd_strerror(err));
137 if (memcmp(fdl->fds, fdl->work_fds, sizeof(struct pollfd) * num_fds) == 0)
141 for (i = 0; i < fdl->num_fds; i++)
142 a->io_free(fdl->ios[i]);
144 if (num_fds != fdl->num_fds) {
151 fdl->ios = pa_xnew(pa_io_event*, num_fds);
154 temp = fdl->work_fds;
155 fdl->work_fds = fdl->fds;
158 fdl->num_fds = num_fds;
160 for (i = 0;i < num_fds;i++)
161 fdl->ios[i] = a->io_new(a, fdl->fds[i].fd,
162 ((fdl->fds[i].events & POLLIN) ? PA_IO_EVENT_INPUT : 0) |
163 ((fdl->fds[i].events & POLLOUT) ? PA_IO_EVENT_OUTPUT : 0),
167 struct pa_alsa_fdlist *pa_alsa_fdlist_new(void) {
168 struct pa_alsa_fdlist *fdl;
170 fdl = pa_xnew0(struct pa_alsa_fdlist, 1);
174 fdl->work_fds = NULL;
184 void pa_alsa_fdlist_free(struct pa_alsa_fdlist *fdl) {
189 fdl->m->defer_free(fdl->defer);
195 for (i = 0;i < fdl->num_fds;i++)
196 fdl->m->io_free(fdl->ios[i]);
203 pa_xfree(fdl->work_fds);
208 int pa_alsa_fdlist_set_mixer(struct pa_alsa_fdlist *fdl, snd_mixer_t *mixer_handle, pa_mainloop_api* m) {
210 pa_assert(mixer_handle);
214 fdl->mixer = mixer_handle;
216 fdl->defer = m->defer_new(m, defer_cb, fdl);
221 static int set_format(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, pa_sample_format_t *f) {
223 static const snd_pcm_format_t format_trans[] = {
224 [PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
225 [PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
226 [PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW,
227 [PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE,
228 [PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE,
229 [PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
230 [PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
231 [PA_SAMPLE_S32LE] = SND_PCM_FORMAT_S32_LE,
232 [PA_SAMPLE_S32BE] = SND_PCM_FORMAT_S32_BE,
235 static const pa_sample_format_t try_order[] = {
250 pa_assert(pcm_handle);
253 if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
256 if (*f == PA_SAMPLE_FLOAT32BE)
257 *f = PA_SAMPLE_FLOAT32LE;
258 else if (*f == PA_SAMPLE_FLOAT32LE)
259 *f = PA_SAMPLE_FLOAT32BE;
260 else if (*f == PA_SAMPLE_S16BE)
261 *f = PA_SAMPLE_S16LE;
262 else if (*f == PA_SAMPLE_S16LE)
263 *f = PA_SAMPLE_S16BE;
264 else if (*f == PA_SAMPLE_S32BE)
265 *f = PA_SAMPLE_S32LE;
266 else if (*f == PA_SAMPLE_S32LE)
267 *f = PA_SAMPLE_S32BE;
271 if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
276 for (i = 0; try_order[i] != PA_SAMPLE_INVALID; i++) {
279 if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
286 /* Set the hardware parameters of the given ALSA device. Returns the
287 * selected fragment settings in *period and *period_size */
288 int pa_alsa_set_hw_params(
289 snd_pcm_t *pcm_handle,
292 snd_pcm_uframes_t *period_size,
293 snd_pcm_uframes_t tsched_size,
295 pa_bool_t *use_tsched,
296 pa_bool_t require_exact_channel_number) {
299 snd_pcm_uframes_t _period_size = *period_size;
300 unsigned int _periods = *periods;
301 snd_pcm_uframes_t buffer_size;
302 unsigned int r = ss->rate;
303 unsigned int c = ss->channels;
304 pa_sample_format_t f = ss->format;
305 snd_pcm_hw_params_t *hwparams;
306 pa_bool_t _use_mmap = use_mmap && *use_mmap;
307 pa_bool_t _use_tsched = use_tsched && *use_tsched;
310 pa_assert(pcm_handle);
313 pa_assert(period_size);
315 snd_pcm_hw_params_alloca(&hwparams);
317 if ((ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0)
320 if ((ret = snd_pcm_hw_params_set_rate_resample(pcm_handle, hwparams, 0)) < 0)
324 if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_MMAP_INTERLEAVED)) < 0) {
326 /* mmap() didn't work, fall back to interleaved */
328 if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
334 } else if ((ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
340 if ((ret = set_format(pcm_handle, hwparams, &f)) < 0)
343 if ((ret = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &r, NULL)) < 0)
346 /* Adjust the buffer sizes, if we didn't get the rate we were asking for */
347 _period_size = (snd_pcm_uframes_t) (((uint64_t) _period_size * r) / ss->rate);
348 tsched_size = (snd_pcm_uframes_t) (((uint64_t) tsched_size * r) / ss->rate);
350 if (require_exact_channel_number) {
351 if ((ret = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, c)) < 0)
354 if ((ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0)
359 _period_size = tsched_size;
362 pa_assert_se(snd_pcm_hw_params_get_buffer_size_max(hwparams, &buffer_size) == 0);
363 pa_log_debug("Maximum hw buffer size is %u ms", (unsigned) buffer_size * 1000 / r);
366 buffer_size = _periods * _period_size;
368 if ((ret = snd_pcm_hw_params_set_periods_integer(pcm_handle, hwparams)) < 0)
373 if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0) {
375 if ((ret = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, &_periods, &dir)) < 0)
380 if (_period_size > 0)
381 if ((ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size)) < 0)
384 if ((ret = snd_pcm_hw_params(pcm_handle, hwparams)) < 0)
388 pa_log_warn("Device %s doesn't support %u Hz, changed to %u Hz.", snd_pcm_name(pcm_handle), ss->rate, r);
390 if (ss->channels != c)
391 pa_log_warn("Device %s doesn't support %u channels, changed to %u.", snd_pcm_name(pcm_handle), ss->channels, c);
394 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));
396 if ((ret = snd_pcm_prepare(pcm_handle)) < 0)
399 if ((ret = snd_pcm_hw_params_get_period_size(hwparams, &_period_size, &dir)) < 0 ||
400 (ret = snd_pcm_hw_params_get_periods(hwparams, &_periods, &dir)) < 0)
403 /* If the sample rate deviates too much, we need to resample */
404 if (r < ss->rate*.95 || r > ss->rate*1.05)
409 pa_assert(_periods > 0);
410 pa_assert(_period_size > 0);
413 *period_size = _period_size;
416 *use_mmap = _use_mmap;
419 *use_tsched = _use_tsched;
428 int pa_alsa_set_sw_params(snd_pcm_t *pcm, snd_pcm_uframes_t avail_min) {
429 snd_pcm_sw_params_t *swparams;
434 snd_pcm_sw_params_alloca(&swparams);
436 if ((err = snd_pcm_sw_params_current(pcm, swparams) < 0)) {
437 pa_log_warn("Unable to determine current swparams: %s\n", snd_strerror(err));
441 if ((err = snd_pcm_sw_params_set_stop_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) {
442 pa_log_warn("Unable to set stop threshold: %s\n", snd_strerror(err));
446 if ((err = snd_pcm_sw_params_set_start_threshold(pcm, swparams, (snd_pcm_uframes_t) -1)) < 0) {
447 pa_log_warn("Unable to set start threshold: %s\n", snd_strerror(err));
451 if ((err = snd_pcm_sw_params_set_avail_min(pcm, swparams, avail_min)) < 0) {
452 pa_log_error("snd_pcm_sw_params_set_avail_min() failed: %s", snd_strerror(err));
456 if ((err = snd_pcm_sw_params(pcm, swparams)) < 0) {
457 pa_log_warn("Unable to set sw params: %s\n", snd_strerror(err));
469 static const struct device_info device_table[] = {
470 {{ 2, { PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT } }, "front" },
472 {{ 4, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
473 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT }}, "surround40" },
475 {{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
476 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
477 PA_CHANNEL_POSITION_LFE }}, "surround41" },
479 {{ 5, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
480 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
481 PA_CHANNEL_POSITION_CENTER }}, "surround50" },
483 {{ 6, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
484 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
485 PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE }}, "surround51" },
487 {{ 8, { PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
488 PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
489 PA_CHANNEL_POSITION_CENTER, PA_CHANNEL_POSITION_LFE,
490 PA_CHANNEL_POSITION_SIDE_LEFT, PA_CHANNEL_POSITION_SIDE_RIGHT }} , "surround71" },
495 static pa_bool_t channel_map_superset(const pa_channel_map *a, const pa_channel_map *b) {
496 pa_bool_t in_a[PA_CHANNEL_POSITION_MAX];
502 memset(in_a, 0, sizeof(in_a));
504 for (i = 0; i < a->channels; i++)
505 in_a[a->map[i]] = TRUE;
507 for (i = 0; i < b->channels; i++)
508 if (!in_a[b->map[i]])
514 snd_pcm_t *pa_alsa_open_by_device_id(
521 snd_pcm_uframes_t *period_size,
522 snd_pcm_uframes_t tsched_size,
524 pa_bool_t *use_tsched) {
530 snd_pcm_t *pcm_handle;
537 pa_assert(period_size);
539 /* First we try to find a device string with a superset of the
540 * requested channel map and open it without the plug: prefix. We
541 * iterate through our device table from top to bottom and take
542 * the first that matches. If we didn't find a working device that
543 * way, we iterate backwards, and check all devices that do not
544 * provide a superset of the requested channel map.*/
546 for (i = 0;; i += direction) {
547 pa_sample_spec try_ss;
550 pa_assert(direction == -1);
552 /* OK, so we iterated backwards, and now are at the
553 * beginning of our list. */
557 } else if (!device_table[i].name) {
558 pa_assert(direction == 1);
560 /* OK, so we are at the end of our list. at iterated
567 if ((direction > 0) == !channel_map_superset(&device_table[i].map, map))
570 d = pa_sprintf_malloc("%s:%s", device_table[i].name, dev_id);
571 pa_log_debug("Trying %s...", d);
573 if ((err = snd_pcm_open(&pcm_handle, d, mode,
575 SND_PCM_NO_AUTO_RESAMPLE|
576 SND_PCM_NO_AUTO_CHANNELS|
577 SND_PCM_NO_AUTO_FORMAT)) < 0) {
578 pa_log_info("Couldn't open PCM device %s: %s", d, snd_strerror(err));
583 try_ss.channels = device_table[i].map.channels;
584 try_ss.rate = ss->rate;
585 try_ss.format = ss->format;
587 if ((err = pa_alsa_set_hw_params(pcm_handle, &try_ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, TRUE)) < 0) {
588 pa_log_info("PCM device %s refused our hw parameters: %s", d, snd_strerror(err));
590 snd_pcm_close(pcm_handle);
595 *map = device_table[i].map;
596 pa_assert(map->channels == ss->channels);
601 /* OK, we didn't find any good device, so let's try the raw plughw: stuff */
603 d = pa_sprintf_malloc("plughw:%s", dev_id);
604 pa_log_debug("Trying %s as last resort...", d);
605 pcm_handle = pa_alsa_open_by_device_string(d, dev, ss, map, mode, nfrags, period_size, tsched_size, use_mmap, use_tsched);
611 snd_pcm_t *pa_alsa_open_by_device_string(
618 snd_pcm_uframes_t *period_size,
619 snd_pcm_uframes_t tsched_size,
621 pa_bool_t *use_tsched) {
625 snd_pcm_t *pcm_handle;
632 pa_assert(period_size);
634 d = pa_xstrdup(device);
638 if ((err = snd_pcm_open(&pcm_handle, d, mode, SND_PCM_NONBLOCK|
639 SND_PCM_NO_AUTO_RESAMPLE|
640 SND_PCM_NO_AUTO_CHANNELS|
641 SND_PCM_NO_AUTO_FORMAT)) < 0) {
642 pa_log("Error opening PCM device %s: %s", d, snd_strerror(err));
647 if ((err = pa_alsa_set_hw_params(pcm_handle, ss, nfrags, period_size, tsched_size, use_mmap, use_tsched, FALSE)) < 0) {
650 /* Hmm, some hw is very exotic, so we retry with plug, if without it didn't work */
652 if (pa_startswith(d, "hw:")) {
653 char *t = pa_sprintf_malloc("plughw:%s", d+3);
654 pa_log_debug("Opening the device as '%s' didn't work, retrying with '%s'.", d, t);
658 snd_pcm_close(pcm_handle);
662 pa_log("Failed to set hardware parameters on %s: %s", d, snd_strerror(err));
664 snd_pcm_close(pcm_handle);
671 if (ss->channels != map->channels)
672 pa_channel_map_init_extend(map, ss->channels, PA_CHANNEL_MAP_ALSA);
678 int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev) {
684 if ((err = snd_mixer_attach(mixer, dev)) < 0) {
685 pa_log_info("Unable to attach to mixer %s: %s", dev, snd_strerror(err));
689 if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) {
690 pa_log_warn("Unable to register mixer: %s", snd_strerror(err));
694 if ((err = snd_mixer_load(mixer)) < 0) {
695 pa_log_warn("Unable to load mixer: %s", snd_strerror(err));
699 pa_log_info("Successfully attached to mixer '%s'", dev);
704 snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback) {
705 snd_mixer_elem_t *elem;
706 snd_mixer_selem_id_t *sid = NULL;
708 snd_mixer_selem_id_alloca(&sid);
713 snd_mixer_selem_id_set_name(sid, name);
715 if (!(elem = snd_mixer_find_selem(mixer, sid))) {
716 pa_log_info("Cannot find mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
719 snd_mixer_selem_id_set_name(sid, fallback);
721 if (!(elem = snd_mixer_find_selem(mixer, sid)))
722 pa_log_warn("Cannot find fallback mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
727 pa_log_info("Using mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
732 static const snd_mixer_selem_channel_id_t alsa_channel_ids[PA_CHANNEL_POSITION_MAX] = {
733 [PA_CHANNEL_POSITION_MONO] = SND_MIXER_SCHN_MONO, /* The ALSA name is just an alias! */
735 [PA_CHANNEL_POSITION_FRONT_CENTER] = SND_MIXER_SCHN_FRONT_CENTER,
736 [PA_CHANNEL_POSITION_FRONT_LEFT] = SND_MIXER_SCHN_FRONT_LEFT,
737 [PA_CHANNEL_POSITION_FRONT_RIGHT] = SND_MIXER_SCHN_FRONT_RIGHT,
739 [PA_CHANNEL_POSITION_REAR_CENTER] = SND_MIXER_SCHN_REAR_CENTER,
740 [PA_CHANNEL_POSITION_REAR_LEFT] = SND_MIXER_SCHN_REAR_LEFT,
741 [PA_CHANNEL_POSITION_REAR_RIGHT] = SND_MIXER_SCHN_REAR_RIGHT,
743 [PA_CHANNEL_POSITION_LFE] = SND_MIXER_SCHN_WOOFER,
745 [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN,
746 [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = SND_MIXER_SCHN_UNKNOWN,
748 [PA_CHANNEL_POSITION_SIDE_LEFT] = SND_MIXER_SCHN_SIDE_LEFT,
749 [PA_CHANNEL_POSITION_SIDE_RIGHT] = SND_MIXER_SCHN_SIDE_RIGHT,
751 [PA_CHANNEL_POSITION_AUX0] = SND_MIXER_SCHN_UNKNOWN,
752 [PA_CHANNEL_POSITION_AUX1] = SND_MIXER_SCHN_UNKNOWN,
753 [PA_CHANNEL_POSITION_AUX2] = SND_MIXER_SCHN_UNKNOWN,
754 [PA_CHANNEL_POSITION_AUX3] = SND_MIXER_SCHN_UNKNOWN,
755 [PA_CHANNEL_POSITION_AUX4] = SND_MIXER_SCHN_UNKNOWN,
756 [PA_CHANNEL_POSITION_AUX5] = SND_MIXER_SCHN_UNKNOWN,
757 [PA_CHANNEL_POSITION_AUX6] = SND_MIXER_SCHN_UNKNOWN,
758 [PA_CHANNEL_POSITION_AUX7] = SND_MIXER_SCHN_UNKNOWN,
759 [PA_CHANNEL_POSITION_AUX8] = SND_MIXER_SCHN_UNKNOWN,
760 [PA_CHANNEL_POSITION_AUX9] = SND_MIXER_SCHN_UNKNOWN,
761 [PA_CHANNEL_POSITION_AUX10] = SND_MIXER_SCHN_UNKNOWN,
762 [PA_CHANNEL_POSITION_AUX11] = SND_MIXER_SCHN_UNKNOWN,
763 [PA_CHANNEL_POSITION_AUX12] = SND_MIXER_SCHN_UNKNOWN,
764 [PA_CHANNEL_POSITION_AUX13] = SND_MIXER_SCHN_UNKNOWN,
765 [PA_CHANNEL_POSITION_AUX14] = SND_MIXER_SCHN_UNKNOWN,
766 [PA_CHANNEL_POSITION_AUX15] = SND_MIXER_SCHN_UNKNOWN,
767 [PA_CHANNEL_POSITION_AUX16] = SND_MIXER_SCHN_UNKNOWN,
768 [PA_CHANNEL_POSITION_AUX17] = SND_MIXER_SCHN_UNKNOWN,
769 [PA_CHANNEL_POSITION_AUX18] = SND_MIXER_SCHN_UNKNOWN,
770 [PA_CHANNEL_POSITION_AUX19] = SND_MIXER_SCHN_UNKNOWN,
771 [PA_CHANNEL_POSITION_AUX20] = SND_MIXER_SCHN_UNKNOWN,
772 [PA_CHANNEL_POSITION_AUX21] = SND_MIXER_SCHN_UNKNOWN,
773 [PA_CHANNEL_POSITION_AUX22] = SND_MIXER_SCHN_UNKNOWN,
774 [PA_CHANNEL_POSITION_AUX23] = SND_MIXER_SCHN_UNKNOWN,
775 [PA_CHANNEL_POSITION_AUX24] = SND_MIXER_SCHN_UNKNOWN,
776 [PA_CHANNEL_POSITION_AUX25] = SND_MIXER_SCHN_UNKNOWN,
777 [PA_CHANNEL_POSITION_AUX26] = SND_MIXER_SCHN_UNKNOWN,
778 [PA_CHANNEL_POSITION_AUX27] = SND_MIXER_SCHN_UNKNOWN,
779 [PA_CHANNEL_POSITION_AUX28] = SND_MIXER_SCHN_UNKNOWN,
780 [PA_CHANNEL_POSITION_AUX29] = SND_MIXER_SCHN_UNKNOWN,
781 [PA_CHANNEL_POSITION_AUX30] = SND_MIXER_SCHN_UNKNOWN,
782 [PA_CHANNEL_POSITION_AUX31] = SND_MIXER_SCHN_UNKNOWN,
784 [PA_CHANNEL_POSITION_TOP_CENTER] = SND_MIXER_SCHN_UNKNOWN,
786 [PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = SND_MIXER_SCHN_UNKNOWN,
787 [PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = SND_MIXER_SCHN_UNKNOWN,
788 [PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = SND_MIXER_SCHN_UNKNOWN,
790 [PA_CHANNEL_POSITION_TOP_REAR_CENTER] = SND_MIXER_SCHN_UNKNOWN,
791 [PA_CHANNEL_POSITION_TOP_REAR_LEFT] = SND_MIXER_SCHN_UNKNOWN,
792 [PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = SND_MIXER_SCHN_UNKNOWN
796 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) {
798 pa_bool_t alsa_channel_used[SND_MIXER_SCHN_LAST];
799 pa_bool_t mono_used = FALSE;
802 pa_assert(channel_map);
803 pa_assert(mixer_map);
805 memset(&alsa_channel_used, 0, sizeof(alsa_channel_used));
807 if (channel_map->channels > 1 &&
808 ((playback && snd_mixer_selem_has_playback_volume_joined(elem)) ||
809 (!playback && snd_mixer_selem_has_capture_volume_joined(elem)))) {
810 pa_log_info("ALSA device lacks independant volume controls for each channel, falling back to software volume control.");
814 for (i = 0; i < channel_map->channels; i++) {
815 snd_mixer_selem_channel_id_t id;
818 is_mono = channel_map->map[i] == PA_CHANNEL_POSITION_MONO;
819 id = alsa_channel_ids[channel_map->map[i]];
821 if (!is_mono && id == SND_MIXER_SCHN_UNKNOWN) {
822 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]));
826 if ((is_mono && mono_used) || (!is_mono && alsa_channel_used[id])) {
827 pa_log_info("Channel map has duplicate channel '%s', falling back to software volume control.", pa_channel_position_to_string(channel_map->map[i]));
831 if ((playback && (!snd_mixer_selem_has_playback_channel(elem, id) || (is_mono && !snd_mixer_selem_is_playback_mono(elem)))) ||
832 (!playback && (!snd_mixer_selem_has_capture_channel(elem, id) || (is_mono && !snd_mixer_selem_is_capture_mono(elem))))) {
834 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]));
839 mixer_map[i] = SND_MIXER_SCHN_MONO;
843 alsa_channel_used[id] = TRUE;
847 pa_log_info("All %u channels can be mapped to mixer channels.", channel_map->channels);
852 void pa_alsa_0dB_playback(snd_mixer_elem_t *elem) {
857 /* Try to enable 0 dB if possible. If ALSA cannot do dB, then use
858 * raw volume levels and fix them to 75% */
860 if (snd_mixer_selem_set_playback_dB_all(elem, 0, -1) >= 0)
863 if (snd_mixer_selem_set_playback_dB_all(elem, 0, 1) >= 0)
866 if (snd_mixer_selem_get_playback_volume_range(elem, &min, &max) < 0)
869 v = min + ((max - min) * 3) / 4; /* 75% */
874 snd_mixer_selem_set_playback_volume_all(elem, v);
877 void pa_alsa_0dB_capture(snd_mixer_elem_t *elem) {
882 /* Try to enable 0 dB if possible. If ALSA cannot do dB, then use
883 * raw volume levels and fix them to 75% */
885 if (snd_mixer_selem_set_capture_dB_all(elem, 0, -1) >= 0)
888 if (snd_mixer_selem_set_capture_dB_all(elem, 0, 1) >= 0)
891 if (snd_mixer_selem_get_capture_volume_range(elem, &min, &max) < 0)
894 v = min + ((max - min) * 3) / 4; /* 75% */
899 snd_mixer_selem_set_capture_volume_all(elem, v);
902 void pa_alsa_dump(snd_pcm_t *pcm) {
908 pa_assert_se(snd_output_buffer_open(&out) == 0);
910 if ((err = snd_pcm_dump(pcm, out)) < 0)
911 pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err));
914 snd_output_buffer_string(out, &s);
915 pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s));
918 pa_assert_se(snd_output_close(out) == 0);
921 void pa_alsa_dump_status(snd_pcm_t *pcm) {
924 snd_pcm_status_t *status;
928 snd_pcm_status_alloca(&status);
930 pa_assert_se(snd_output_buffer_open(&out) == 0);
932 pa_assert_se(snd_pcm_status(pcm, status) == 0);
934 if ((err = snd_pcm_status_dump(status, out)) < 0)
935 pa_log_debug("snd_pcm_dump(): %s", snd_strerror(err));
938 snd_output_buffer_string(out, &s);
939 pa_log_debug("snd_pcm_dump():\n%s", pa_strnull(s));
942 pa_assert_se(snd_output_close(out) == 0);
945 static void alsa_error_handler(const char *file, int line, const char *function, int err, const char *fmt,...) {
950 pa_log_levelv_meta(PA_LOG_WARN, file, line, function, fmt, ap);
955 static pa_atomic_t n_error_handler_installed = PA_ATOMIC_INIT(0);
957 void pa_alsa_redirect_errors_inc(void) {
958 /* This is not really thread safe, but we do our best */
960 if (pa_atomic_inc(&n_error_handler_installed) == 0)
961 snd_lib_error_set_handler(alsa_error_handler);
964 void pa_alsa_redirect_errors_dec(void) {
967 pa_assert_se((r = pa_atomic_dec(&n_error_handler_installed)) >= 1);
970 snd_lib_error_set_handler(NULL);
973 void pa_alsa_init_proplist(pa_proplist *p, snd_pcm_info_t *pcm_info) {
975 static const char * const alsa_class_table[SND_PCM_CLASS_LAST+1] = {
976 [SND_PCM_CLASS_GENERIC] = "generic",
977 [SND_PCM_CLASS_MULTI] = "multi",
978 [SND_PCM_CLASS_MODEM] = "modem",
979 [SND_PCM_CLASS_DIGITIZER] = "digitizer"
981 static const char * const class_table[SND_PCM_CLASS_LAST+1] = {
982 [SND_PCM_CLASS_GENERIC] = "sound",
983 [SND_PCM_CLASS_MULTI] = NULL,
984 [SND_PCM_CLASS_MODEM] = "modem",
985 [SND_PCM_CLASS_DIGITIZER] = NULL
987 static const char * const alsa_subclass_table[SND_PCM_SUBCLASS_LAST+1] = {
988 [SND_PCM_SUBCLASS_GENERIC_MIX] = "generic-mix",
989 [SND_PCM_SUBCLASS_MULTI_MIX] = "multi-mix"
992 snd_pcm_class_t class;
993 snd_pcm_subclass_t subclass;
994 const char *n, *id, *sdn;
995 char *cn = NULL, *lcn = NULL;
1001 pa_proplist_sets(p, PA_PROP_DEVICE_API, "alsa");
1003 class = snd_pcm_info_get_class(pcm_info);
1004 if (class <= SND_PCM_CLASS_LAST) {
1005 if (class_table[class])
1006 pa_proplist_sets(p, PA_PROP_DEVICE_CLASS, class_table[class]);
1007 if (alsa_class_table[class])
1008 pa_proplist_sets(p, "alsa.class", alsa_class_table[class]);
1010 subclass = snd_pcm_info_get_subclass(pcm_info);
1011 if (subclass <= SND_PCM_SUBCLASS_LAST)
1012 if (alsa_subclass_table[subclass])
1013 pa_proplist_sets(p, "alsa.subclass", alsa_subclass_table[subclass]);
1015 if ((n = snd_pcm_info_get_name(pcm_info)))
1016 pa_proplist_sets(p, "alsa.name", n);
1018 if ((id = snd_pcm_info_get_id(pcm_info)))
1019 pa_proplist_sets(p, "alsa.id", id);
1021 pa_proplist_setf(p, "alsa.subdevice", "%u", snd_pcm_info_get_subdevice(pcm_info));
1022 if ((sdn = snd_pcm_info_get_subdevice_name(pcm_info)))
1023 pa_proplist_sets(p, "alsa.subdevice_name", sdn);
1025 pa_proplist_setf(p, "alsa.device", "%u", snd_pcm_info_get_device(pcm_info));
1027 if ((card = snd_pcm_info_get_card(pcm_info)) >= 0) {
1028 pa_proplist_setf(p, "alsa.card", "%i", card);
1030 if (snd_card_get_name(card, &cn) >= 0)
1031 pa_proplist_sets(p, "alsa.card_name", cn);
1033 if (snd_card_get_longname(card, &lcn) >= 0)
1034 pa_proplist_sets(p, "alsa.long_card_name", lcn);
1038 pa_proplist_setf(p, PA_PROP_DEVICE_DESCRIPTION, "%s - %s", cn, n);
1040 pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, cn);
1042 pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, n);
1048 int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents) {
1049 snd_pcm_state_t state;
1054 if (revents & POLLERR)
1055 pa_log_warn("Got POLLERR from ALSA");
1056 if (revents & POLLNVAL)
1057 pa_log_warn("Got POLLNVAL from ALSA");
1058 if (revents & POLLHUP)
1059 pa_log_warn("Got POLLHUP from ALSA");
1061 state = snd_pcm_state(pcm);
1062 pa_log_warn("PCM state is %s", snd_pcm_state_name(state));
1064 /* Try to recover from this error */
1068 case SND_PCM_STATE_XRUN:
1069 if ((err = snd_pcm_recover(pcm, -EPIPE, 1)) != 0) {
1070 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and XRUN: %s", snd_strerror(err));
1075 case SND_PCM_STATE_SUSPENDED:
1076 if ((err = snd_pcm_recover(pcm, -ESTRPIPE, 1)) != 0) {
1077 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and SUSPENDED: %s", snd_strerror(err));
1086 if ((err = snd_pcm_prepare(pcm)) < 0) {
1087 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): %s", snd_strerror(err));
1096 pa_rtpoll_item* pa_alsa_build_pollfd(snd_pcm_t *pcm, pa_rtpoll *rtpoll) {
1098 struct pollfd *pollfd;
1099 pa_rtpoll_item *item;
1103 if ((n = snd_pcm_poll_descriptors_count(pcm)) < 0) {
1104 pa_log("snd_pcm_poll_descriptors_count() failed: %s", snd_strerror(n));
1108 item = pa_rtpoll_item_new(rtpoll, PA_RTPOLL_NEVER, n);
1109 pollfd = pa_rtpoll_item_get_pollfd(item, NULL);
1111 if ((err = snd_pcm_poll_descriptors(pcm, pollfd, n)) < 0) {
1112 pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err));
1113 pa_rtpoll_item_free(item);