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
32 #ifdef HAVE_SYS_POLL_H
38 #include <asoundlib.h>
40 #include <pulse/xmalloc.h>
42 #include <pulsecore/core-error.h>
43 #include <pulsecore/core.h>
44 #include <pulsecore/module.h>
45 #include <pulsecore/memchunk.h>
46 #include <pulsecore/sink.h>
47 #include <pulsecore/modargs.h>
48 #include <pulsecore/core-util.h>
49 #include <pulsecore/sample-util.h>
50 #include <pulsecore/log.h>
52 #include "alsa-util.h"
53 #include "module-alsa-source-symdef.h"
55 PA_MODULE_AUTHOR("Lennart Poettering")
56 PA_MODULE_DESCRIPTION("ALSA Source")
57 PA_MODULE_VERSION(PACKAGE_VERSION)
59 "source_name=<name for the source> "
60 "device=<ALSA device> "
61 "format=<sample format> "
62 "channels=<number of channels> "
64 "fragments=<number of fragments> "
65 "fragment_size=<fragment size> "
66 "channel_map=<channel map>")
69 snd_pcm_t *pcm_handle;
70 snd_mixer_t *mixer_handle;
71 snd_mixer_elem_t *mixer_elem;
73 struct pa_alsa_fdlist *pcm_fdl;
74 struct pa_alsa_fdlist *mixer_fdl;
75 long hw_volume_max, hw_volume_min;
77 size_t frame_size, fragment_size;
82 static const char* const valid_modargs[] = {
94 #define DEFAULT_DEVICE "default"
96 static void update_usage(struct userdata *u) {
97 pa_module_set_used(u->module, u->source ? pa_source_used_by(u->source) : 0);
100 static void clear_up(struct userdata *u) {
104 pa_source_disconnect(u->source);
105 pa_source_unref(u->source);
110 pa_alsa_fdlist_free(u->pcm_fdl);
112 pa_alsa_fdlist_free(u->mixer_fdl);
114 u->pcm_fdl = u->mixer_fdl = NULL;
116 if (u->mixer_handle) {
117 snd_mixer_close(u->mixer_handle);
118 u->mixer_handle = NULL;
122 snd_pcm_drop(u->pcm_handle);
123 snd_pcm_close(u->pcm_handle);
124 u->pcm_handle = NULL;
128 static int xrun_recovery(struct userdata *u) {
132 pa_log_info("*** ALSA-XRUN (capture) ***");
134 if ((ret = snd_pcm_prepare(u->pcm_handle)) < 0) {
135 pa_log("snd_pcm_prepare() failed: %s", snd_strerror(-ret));
138 pa_module_unload_request(u->module);
147 static int suspend_recovery(struct userdata *u) {
151 pa_log_info("*** ALSA-SUSPEND (capture) ***");
153 if ((ret = snd_pcm_resume(u->pcm_handle)) < 0) {
158 pa_log("snd_pcm_resume() failed: %s", snd_strerror(-ret));
160 if ((ret = snd_pcm_prepare(u->pcm_handle)) < 0)
161 pa_log("snd_pcm_prepare() failed: %s", snd_strerror(-ret));
166 pa_module_unload_request(u->module);
174 static void do_read(struct userdata *u) {
180 pa_memchunk post_memchunk;
181 snd_pcm_sframes_t frames;
185 if (!u->memchunk.memblock) {
186 u->memchunk.memblock = pa_memblock_new(u->source->core->mempool, u->memchunk.length = u->fragment_size);
187 u->memchunk.index = 0;
190 assert(u->memchunk.memblock);
191 assert(u->memchunk.length);
192 assert(u->memchunk.length % u->frame_size == 0);
194 p = pa_memblock_acquire(u->memchunk.memblock);
196 if ((frames = snd_pcm_readi(u->pcm_handle, (uint8_t*) p + u->memchunk.index, u->memchunk.length / u->frame_size)) < 0) {
197 pa_memblock_release(u->memchunk.memblock);
199 if (frames == -EAGAIN)
202 if (frames == -EPIPE) {
203 if (xrun_recovery(u) < 0)
209 if (frames == -ESTRPIPE) {
210 if (suspend_recovery(u) < 0)
216 pa_log("snd_pcm_readi() failed: %s", snd_strerror(-frames));
219 pa_module_unload_request(u->module);
222 pa_memblock_release(u->memchunk.memblock);
224 l = frames * u->frame_size;
226 post_memchunk = u->memchunk;
227 post_memchunk.length = l;
229 pa_source_post(u->source, &post_memchunk);
231 u->memchunk.index += l;
232 u->memchunk.length -= l;
234 if (u->memchunk.length == 0) {
235 pa_memblock_unref(u->memchunk.memblock);
236 u->memchunk.memblock = NULL;
237 u->memchunk.index = u->memchunk.length = 0;
244 static void fdl_callback(void *userdata) {
245 struct userdata *u = userdata;
248 if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN)
249 if (xrun_recovery(u) < 0)
252 if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_SUSPENDED)
253 if (suspend_recovery(u) < 0)
259 static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
260 struct userdata *u = snd_mixer_elem_get_callback_private(elem);
262 assert(u && u->mixer_handle);
264 if (mask == SND_CTL_EVENT_MASK_REMOVE)
267 if (mask & SND_CTL_EVENT_MASK_VALUE) {
268 if (u->source->get_hw_volume)
269 u->source->get_hw_volume(u->source);
270 if (u->source->get_hw_mute)
271 u->source->get_hw_mute(u->source);
273 pa_subscription_post(u->source->core,
274 PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_CHANGE,
281 static pa_usec_t source_get_latency_cb(pa_source *s) {
282 struct userdata *u = s->userdata;
283 snd_pcm_sframes_t frames;
284 assert(s && u && u->source);
286 if (snd_pcm_delay(u->pcm_handle, &frames) < 0) {
287 pa_log("failed to get delay");
288 s->get_latency = NULL;
292 return pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec);
295 static int source_get_hw_volume_cb(pa_source *s) {
296 struct userdata *u = s->userdata;
301 assert(u && u->mixer_elem);
303 for (i = 0;i < s->hw_volume.channels;i++) {
306 assert(snd_mixer_selem_has_capture_channel(u->mixer_elem, i));
308 if ((err = snd_mixer_selem_get_capture_volume(u->mixer_elem, i, &vol)) < 0)
311 set_vol = (long) roundf(((float) s->hw_volume.values[i] * (u->hw_volume_max - u->hw_volume_min)) / PA_VOLUME_NORM) + u->hw_volume_min;
313 /* Try to avoid superfluous volume changes */
315 s->hw_volume.values[i] = (pa_volume_t) roundf(((float) (vol - u->hw_volume_min) * PA_VOLUME_NORM) / (u->hw_volume_max - u->hw_volume_min));
321 pa_log_error("Unable to read volume: %s", snd_strerror(err));
322 s->get_hw_volume = NULL;
323 s->set_hw_volume = NULL;
327 static int source_set_hw_volume_cb(pa_source *s) {
328 struct userdata *u = s->userdata;
333 assert(u && u->mixer_elem);
335 for (i = 0;i < s->hw_volume.channels;i++) {
336 assert(snd_mixer_selem_has_capture_channel(u->mixer_elem, i));
338 vol = s->hw_volume.values[i];
340 if (vol > PA_VOLUME_NORM)
341 vol = PA_VOLUME_NORM;
343 vol = (long) roundf(((float) vol * (u->hw_volume_max - u->hw_volume_min)) / PA_VOLUME_NORM) + u->hw_volume_min;
345 if ((err = snd_mixer_selem_set_capture_volume(u->mixer_elem, i, vol)) < 0)
352 pa_log_error("Unable to set volume: %s", snd_strerror(err));
353 s->get_hw_volume = NULL;
354 s->set_hw_volume = NULL;
358 static int source_get_hw_mute_cb(pa_source *s) {
359 struct userdata *u = s->userdata;
362 assert(u && u->mixer_elem);
364 err = snd_mixer_selem_get_capture_switch(u->mixer_elem, 0, &sw);
366 pa_log_error("Unable to get switch: %s", snd_strerror(err));
367 s->get_hw_mute = NULL;
368 s->set_hw_mute = NULL;
377 static int source_set_hw_mute_cb(pa_source *s) {
378 struct userdata *u = s->userdata;
381 assert(u && u->mixer_elem);
383 err = snd_mixer_selem_set_capture_switch_all(u->mixer_elem, !s->hw_muted);
385 pa_log_error("Unable to set switch: %s", snd_strerror(err));
386 s->get_hw_mute = NULL;
387 s->set_hw_mute = NULL;
394 int pa__init(pa_core *c, pa_module*m) {
395 pa_modargs *ma = NULL;
397 struct userdata *u = NULL;
401 unsigned periods, fragsize;
402 snd_pcm_uframes_t period_size;
404 snd_pcm_info_t *pcm_info = NULL;
408 char *name_buf = NULL;
411 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
412 pa_log("failed to parse module arguments");
416 ss = c->default_sample_spec;
417 if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
418 pa_log("failed to parse sample specification");
422 frame_size = pa_frame_size(&ss);
424 /* Fix latency to 100ms */
426 fragsize = pa_bytes_per_second(&ss)/128;
428 if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
429 pa_log("failed to parse buffer metrics");
432 period_size = fragsize/frame_size;
434 u = pa_xnew0(struct userdata, 1);
438 snd_config_update_free_global();
439 if ((err = snd_pcm_open(&u->pcm_handle, dev = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) {
440 pa_log("Error opening PCM device %s: %s", dev, snd_strerror(err));
444 if ((err = snd_pcm_info_malloc(&pcm_info)) < 0 ||
445 (err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
446 pa_log("Error fetching PCM info: %s", snd_strerror(err));
450 if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &period_size)) < 0) {
451 pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
455 if (ss.channels != map.channels)
456 /* Seems ALSA didn't like the channel number, so let's fix the channel map */
457 pa_channel_map_init_auto(&map, ss.channels, PA_CHANNEL_MAP_ALSA);
459 if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0) {
460 pa_log("Error opening mixer: %s", snd_strerror(err));
464 if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
465 !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Capture", "Mic"))) {
466 snd_mixer_close(u->mixer_handle);
467 u->mixer_handle = NULL;
470 if ((name = pa_modargs_get_value(ma, "source_name", NULL)))
473 name = name_buf = pa_sprintf_malloc("alsa_input.%s", dev);
477 if (!(u->source = pa_source_new(c, __FILE__, name, namereg_fail, &ss, &map))) {
478 pa_log("Failed to create source object");
482 u->source->is_hardware = 1;
483 u->source->userdata = u;
484 u->source->get_latency = source_get_latency_cb;
485 if (u->mixer_handle) {
486 assert(u->mixer_elem);
487 if (snd_mixer_selem_has_capture_volume(u->mixer_elem)) {
490 for (i = 0;i < ss.channels;i++) {
491 if (!snd_mixer_selem_has_capture_channel(u->mixer_elem, i))
495 if (i == ss.channels) {
496 u->source->get_hw_volume = source_get_hw_volume_cb;
497 u->source->set_hw_volume = source_set_hw_volume_cb;
498 snd_mixer_selem_get_capture_volume_range(
499 u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
502 if (snd_mixer_selem_has_capture_switch(u->mixer_elem)) {
503 u->source->get_hw_mute = source_get_hw_mute_cb;
504 u->source->set_hw_mute = source_set_hw_mute_cb;
507 pa_source_set_owner(u->source, m);
508 pa_source_set_description(u->source, t = pa_sprintf_malloc("ALSA PCM on %s (%s)", dev, snd_pcm_info_get_name(pcm_info)));
511 u->pcm_fdl = pa_alsa_fdlist_new();
513 if (pa_alsa_fdlist_init_pcm(u->pcm_fdl, u->pcm_handle, c->mainloop, fdl_callback, u) < 0) {
514 pa_log("failed to initialise file descriptor monitoring");
518 if (u->mixer_handle) {
519 u->mixer_fdl = pa_alsa_fdlist_new();
520 assert(u->mixer_fdl);
521 if (pa_alsa_fdlist_init_mixer(u->mixer_fdl, u->mixer_handle, c->mainloop) < 0) {
522 pa_log("failed to initialise file descriptor monitoring");
525 snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
526 snd_mixer_elem_set_callback_private(u->mixer_elem, u);
530 u->frame_size = frame_size;
531 u->fragment_size = period_size * frame_size;
533 pa_log_info("using %u fragments of size %lu bytes.", periods, (long unsigned) u->fragment_size);
535 u->memchunk.memblock = NULL;
536 u->memchunk.index = u->memchunk.length = 0;
538 snd_pcm_start(u->pcm_handle);
542 /* Get initial mixer settings */
543 if (u->source->get_hw_volume)
544 u->source->get_hw_volume(u->source);
545 if (u->source->get_hw_mute)
546 u->source->get_hw_mute(u->source);
555 snd_pcm_info_free(pcm_info);
567 void pa__done(pa_core *c, pa_module*m) {
571 if (!(u = m->userdata))
576 if (u->memchunk.memblock)
577 pa_memblock_unref(u->memchunk.memblock);