4 This file is part of polypaudio.
6 polypaudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2 of the License,
9 or (at your option) any later version.
11 polypaudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with polypaudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
29 #ifdef HAVE_SYS_POLL_H
35 #include <asoundlib.h>
37 #include <polyp/xmalloc.h>
39 #include <polypcore/core.h>
40 #include <polypcore/module.h>
41 #include <polypcore/memchunk.h>
42 #include <polypcore/sink.h>
43 #include <polypcore/modargs.h>
44 #include <polypcore/core-util.h>
45 #include <polypcore/sample-util.h>
46 #include <polypcore/log.h>
48 #include "alsa-util.h"
49 #include "module-alsa-sink-symdef.h"
51 PA_MODULE_AUTHOR("Lennart Poettering")
52 PA_MODULE_DESCRIPTION("ALSA Sink")
53 PA_MODULE_VERSION(PACKAGE_VERSION)
55 "sink_name=<name for the sink> "
56 "device=<ALSA device> "
57 "format=<sample format> "
58 "channels=<number of channels> "
60 "fragments=<number of fragments> "
61 "fragment_size=<fragment size> "
62 "channel_map=<channel map>")
65 snd_pcm_t *pcm_handle;
66 snd_mixer_t *mixer_handle;
67 snd_mixer_elem_t *mixer_elem;
69 struct pa_alsa_fdlist *pcm_fdl;
70 struct pa_alsa_fdlist *mixer_fdl;
71 long hw_volume_max, hw_volume_min;
73 size_t frame_size, fragment_size;
74 pa_memchunk memchunk, silence;
78 static const char* const valid_modargs[] = {
90 #define DEFAULT_SINK_NAME "alsa_output"
91 #define DEFAULT_DEVICE "default"
93 static void update_usage(struct userdata *u) {
94 pa_module_set_used(u->module,
95 (u->sink ? pa_idxset_size(u->sink->inputs) : 0) +
96 (u->sink ? pa_idxset_size(u->sink->monitor_source->outputs) : 0));
99 static void xrun_recovery(struct userdata *u) {
102 pa_log(__FILE__": *** ALSA-XRUN (playback) ***");
104 if (snd_pcm_prepare(u->pcm_handle) < 0)
105 pa_log(__FILE__": snd_pcm_prepare() failed");
108 static void do_write(struct userdata *u) {
114 pa_memchunk *memchunk = NULL;
115 snd_pcm_sframes_t frames;
117 if (u->memchunk.memblock)
118 memchunk = &u->memchunk;
120 if (pa_sink_render(u->sink, u->fragment_size, &u->memchunk) < 0)
121 memchunk = &u->silence;
123 memchunk = &u->memchunk;
126 assert(memchunk->memblock && memchunk->memblock->data && memchunk->length && memchunk->memblock->length && (memchunk->length % u->frame_size) == 0);
128 if ((frames = snd_pcm_writei(u->pcm_handle, (uint8_t*) memchunk->memblock->data + memchunk->index, memchunk->length / u->frame_size)) < 0) {
129 if (frames == -EAGAIN)
132 if (frames == -EPIPE) {
137 pa_log(__FILE__": snd_pcm_writei() failed: %s", snd_strerror(frames));
141 if (memchunk == &u->memchunk) {
142 size_t l = frames * u->frame_size;
143 memchunk->index += l;
144 memchunk->length -= l;
146 if (memchunk->length == 0) {
147 pa_memblock_unref(memchunk->memblock);
148 memchunk->memblock = NULL;
149 memchunk->index = memchunk->length = 0;
157 static void fdl_callback(void *userdata) {
158 struct userdata *u = userdata;
161 if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN)
167 static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
168 struct userdata *u = snd_mixer_elem_get_callback_private(elem);
170 assert(u && u->mixer_handle);
172 if (mask == SND_CTL_EVENT_MASK_REMOVE)
175 if (mask & SND_CTL_EVENT_MASK_VALUE) {
176 if (u->sink->get_hw_volume)
177 u->sink->get_hw_volume(u->sink);
178 if (u->sink->get_hw_mute)
179 u->sink->get_hw_mute(u->sink);
180 pa_subscription_post(u->sink->core,
181 PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE,
188 static pa_usec_t sink_get_latency_cb(pa_sink *s) {
190 struct userdata *u = s->userdata;
191 snd_pcm_sframes_t frames;
194 assert(s && u && u->sink);
196 if ((err = snd_pcm_delay(u->pcm_handle, &frames)) < 0) {
197 pa_log(__FILE__": failed to get delay: %s", snd_strerror(err));
198 s->get_latency = NULL;
205 r += pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec);
207 if (u->memchunk.memblock)
208 r += pa_bytes_to_usec(u->memchunk.length, &s->sample_spec);
213 static int sink_get_hw_volume_cb(pa_sink *s) {
214 struct userdata *u = s->userdata;
219 assert(u && u->mixer_elem);
221 for (i = 0;i < s->hw_volume.channels;i++) {
222 assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, i));
224 err = snd_mixer_selem_get_playback_volume(u->mixer_elem, i, &vol);
227 s->hw_volume.values[i] =
228 (vol - u->hw_volume_min) * PA_VOLUME_NORM / (u->hw_volume_max - u->hw_volume_min);
234 pa_log_error(__FILE__": Unable to read volume: %s", snd_strerror(err));
235 s->get_hw_volume = NULL;
236 s->set_hw_volume = NULL;
240 static int sink_set_hw_volume_cb(pa_sink *s) {
241 struct userdata *u = s->userdata;
246 assert(u && u->mixer_elem);
248 for (i = 0;i < s->hw_volume.channels;i++) {
249 assert(snd_mixer_selem_has_playback_channel(u->mixer_elem, i));
251 vol = s->hw_volume.values[i];
253 if (vol > PA_VOLUME_NORM)
254 vol = PA_VOLUME_NORM;
256 vol = (vol * (u->hw_volume_max - u->hw_volume_min)) /
257 PA_VOLUME_NORM + u->hw_volume_min;
259 err = snd_mixer_selem_set_playback_volume(u->mixer_elem, i, vol);
267 pa_log_error(__FILE__": Unable to set volume: %s", snd_strerror(err));
268 s->get_hw_volume = NULL;
269 s->set_hw_volume = NULL;
273 static int sink_get_hw_mute_cb(pa_sink *s) {
274 struct userdata *u = s->userdata;
277 assert(u && u->mixer_elem);
279 err = snd_mixer_selem_get_playback_switch(u->mixer_elem, 0, &sw);
281 pa_log_error(__FILE__": Unable to get switch: %s", snd_strerror(err));
282 s->get_hw_mute = NULL;
283 s->set_hw_mute = NULL;
292 static int sink_set_hw_mute_cb(pa_sink *s) {
293 struct userdata *u = s->userdata;
296 assert(u && u->mixer_elem);
298 err = snd_mixer_selem_set_playback_switch_all(u->mixer_elem, !s->hw_muted);
300 pa_log_error(__FILE__": Unable to set switch: %s", snd_strerror(err));
301 s->get_hw_mute = NULL;
302 s->set_hw_mute = NULL;
309 int pa__init(pa_core *c, pa_module*m) {
310 pa_modargs *ma = NULL;
312 struct userdata *u = NULL;
316 uint32_t periods, fragsize;
317 snd_pcm_uframes_t period_size;
319 snd_pcm_info_t *pcm_info = NULL;
322 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
323 pa_log(__FILE__": failed to parse module arguments");
327 ss = c->default_sample_spec;
328 if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
329 pa_log(__FILE__": failed to parse sample specification and channel map");
333 frame_size = pa_frame_size(&ss);
335 /* Fix latency to 100ms */
337 fragsize = pa_bytes_per_second(&ss)/128;
339 if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
340 pa_log(__FILE__": failed to parse buffer metrics");
343 period_size = fragsize/frame_size;
345 u = pa_xmalloc0(sizeof(struct userdata));
349 snd_config_update_free_global();
350 if ((err = snd_pcm_open(&u->pcm_handle, dev = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) {
351 pa_log(__FILE__": Error opening PCM device %s: %s", dev, snd_strerror(err));
355 if ((err = snd_pcm_info_malloc(&pcm_info)) < 0 ||
356 (err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
357 pa_log(__FILE__": Error fetching PCM info: %s", snd_strerror(err));
361 if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &period_size)) < 0) {
362 pa_log(__FILE__": Failed to set hardware parameters: %s", snd_strerror(err));
366 if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0) {
367 pa_log(__FILE__": Error opening mixer: %s", snd_strerror(err));
371 if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
372 !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "PCM"))) {
373 snd_mixer_close(u->mixer_handle);
374 u->mixer_handle = NULL;
377 u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, &map);
380 u->sink->get_latency = sink_get_latency_cb;
381 if (u->mixer_handle) {
382 assert(u->mixer_elem);
383 if (snd_mixer_selem_has_playback_volume(u->mixer_elem)) {
386 for (i = 0;i < ss.channels;i++) {
387 if (!snd_mixer_selem_has_playback_channel(u->mixer_elem, i))
391 if (i == ss.channels) {
392 u->sink->get_hw_volume = sink_get_hw_volume_cb;
393 u->sink->set_hw_volume = sink_set_hw_volume_cb;
394 snd_mixer_selem_get_playback_volume_range(
395 u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
398 if (snd_mixer_selem_has_playback_switch(u->mixer_elem)) {
399 u->sink->get_hw_mute = sink_get_hw_mute_cb;
400 u->sink->set_hw_mute = sink_set_hw_mute_cb;
403 u->sink->userdata = u;
404 pa_sink_set_owner(u->sink, m);
405 u->sink->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s' (%s)", dev, snd_pcm_info_get_name(pcm_info));
407 u->pcm_fdl = pa_alsa_fdlist_new();
409 if (pa_alsa_fdlist_init_pcm(u->pcm_fdl, u->pcm_handle, c->mainloop, fdl_callback, u) < 0) {
410 pa_log(__FILE__": failed to initialise file descriptor monitoring");
414 if (u->mixer_handle) {
415 u->mixer_fdl = pa_alsa_fdlist_new();
416 assert(u->mixer_fdl);
417 if (pa_alsa_fdlist_init_mixer(u->mixer_fdl, u->mixer_handle, c->mainloop) < 0) {
418 pa_log(__FILE__": failed to initialise file descriptor monitoring");
421 snd_mixer_elem_set_callback(u->mixer_elem, mixer_callback);
422 snd_mixer_elem_set_callback_private(u->mixer_elem, u);
425 u->frame_size = frame_size;
426 u->fragment_size = period_size * frame_size;
428 pa_log_info(__FILE__": using %u fragments of size %lu bytes.", periods, (long unsigned)u->fragment_size);
430 u->silence.memblock = pa_memblock_new(u->silence.length = u->fragment_size, c->memblock_stat);
431 assert(u->silence.memblock);
432 pa_silence_memblock(u->silence.memblock, &ss);
433 u->silence.index = 0;
435 u->memchunk.memblock = NULL;
436 u->memchunk.index = u->memchunk.length = 0;
440 /* Get initial mixer settings */
441 if (u->sink->get_hw_volume)
442 u->sink->get_hw_volume(u->sink);
443 if (u->sink->get_hw_mute)
444 u->sink->get_hw_mute(u->sink);
451 snd_pcm_info_free(pcm_info);
463 void pa__done(pa_core *c, pa_module*m) {
467 if (!(u = m->userdata))
471 pa_sink_disconnect(u->sink);
472 pa_sink_unref(u->sink);
476 pa_alsa_fdlist_free(u->pcm_fdl);
478 pa_alsa_fdlist_free(u->mixer_fdl);
481 snd_mixer_close(u->mixer_handle);
484 snd_pcm_drop(u->pcm_handle);
485 snd_pcm_close(u->pcm_handle);
488 if (u->memchunk.memblock)
489 pa_memblock_unref(u->memchunk.memblock);
490 if (u->silence.memblock)
491 pa_memblock_unref(u->silence.memblock);