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 <polypcore/core.h>
38 #include <polypcore/module.h>
39 #include <polypcore/memchunk.h>
40 #include <polypcore/sink.h>
41 #include <polypcore/modargs.h>
42 #include <polypcore/util.h>
43 #include <polypcore/sample-util.h>
44 #include <polypcore/xmalloc.h>
45 #include <polypcore/log.h>
47 #include "alsa-util.h"
48 #include "module-alsa-source-symdef.h"
50 PA_MODULE_AUTHOR("Lennart Poettering")
51 PA_MODULE_DESCRIPTION("ALSA Source")
52 PA_MODULE_VERSION(PACKAGE_VERSION)
53 PA_MODULE_USAGE("source_name=<name for the source> device=<ALSA device> format=<sample format> channels=<number of channels> rate=<sample rate> fragments=<number of fragments> fragment_size=<fragment size>")
56 snd_pcm_t *pcm_handle;
57 snd_mixer_t *mixer_handle;
58 snd_mixer_elem_t *mixer_elem;
60 pa_io_event **io_events;
62 long hw_volume_max, hw_volume_min;
64 size_t frame_size, fragment_size;
69 static const char* const valid_modargs[] = {
80 #define DEFAULT_SOURCE_NAME "alsa_input"
81 #define DEFAULT_DEVICE "hw:0,0"
83 static void update_usage(struct userdata *u) {
84 pa_module_set_used(u->module,
85 (u->source ? pa_idxset_size(u->source->outputs) : 0));
88 static void xrun_recovery(struct userdata *u) {
91 pa_log(__FILE__": *** ALSA-XRUN (capture) ***");
93 if (snd_pcm_prepare(u->pcm_handle) < 0)
94 pa_log(__FILE__": snd_pcm_prepare() failed");
97 static void do_read(struct userdata *u) {
103 pa_memchunk post_memchunk;
104 snd_pcm_sframes_t frames;
107 if (!u->memchunk.memblock) {
108 u->memchunk.memblock = pa_memblock_new(u->memchunk.length = u->fragment_size, u->source->core->memblock_stat);
109 u->memchunk.index = 0;
112 assert(u->memchunk.memblock && u->memchunk.memblock->data && u->memchunk.length && u->memchunk.memblock->length && (u->memchunk.length % u->frame_size) == 0);
114 if ((frames = snd_pcm_readi(u->pcm_handle, (uint8_t*) u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length / u->frame_size)) < 0) {
115 if (frames == -EAGAIN)
118 if (frames == -EPIPE) {
123 pa_log(__FILE__": snd_pcm_readi() failed: %s", strerror(-frames));
127 l = frames * u->frame_size;
129 post_memchunk = u->memchunk;
130 post_memchunk.length = l;
132 pa_source_post(u->source, &post_memchunk);
134 u->memchunk.index += l;
135 u->memchunk.length -= l;
137 if (u->memchunk.length == 0) {
138 pa_memblock_unref(u->memchunk.memblock);
139 u->memchunk.memblock = NULL;
140 u->memchunk.index = u->memchunk.length = 0;
147 static void io_callback(pa_mainloop_api*a, pa_io_event *e, PA_GCC_UNUSED int fd, PA_GCC_UNUSED pa_io_event_flags_t f, void *userdata) {
148 struct userdata *u = userdata;
151 if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN)
157 static pa_usec_t source_get_latency_cb(pa_source *s) {
158 struct userdata *u = s->userdata;
159 snd_pcm_sframes_t frames;
160 assert(s && u && u->source);
162 if (snd_pcm_delay(u->pcm_handle, &frames) < 0) {
163 pa_log(__FILE__": failed to get delay");
164 s->get_latency = NULL;
168 return pa_bytes_to_usec(frames * u->frame_size, &s->sample_spec);
171 static int source_get_hw_volume_cb(pa_source *s) {
172 struct userdata *u = s->userdata;
176 assert(u && u->mixer_elem);
178 if (snd_mixer_selem_has_capture_volume_joined(u->mixer_elem)) {
179 err = snd_mixer_selem_get_capture_volume(u->mixer_elem, 0, &vol);
182 pa_cvolume_set(&s->hw_volume, s->hw_volume.channels,
183 (vol - u->hw_volume_min) * PA_VOLUME_NORM / (u->hw_volume_max - u->hw_volume_min));
187 for (i = 0;i < s->hw_volume.channels;i++) {
188 err = snd_mixer_selem_get_capture_volume(u->mixer_elem, i, &vol);
191 s->hw_volume.values[i] =
192 (vol - u->hw_volume_min) * PA_VOLUME_NORM / (u->hw_volume_max - u->hw_volume_min);
199 pa_log_error(__FILE__": Unable to read volume: %s", snd_strerror(err));
200 s->get_hw_volume = NULL;
201 s->set_hw_volume = NULL;
205 static int source_set_hw_volume_cb(pa_source *s) {
206 struct userdata *u = s->userdata;
210 assert(u && u->mixer_elem);
212 if (snd_mixer_selem_has_capture_volume_joined(u->mixer_elem)) {
213 vol = pa_cvolume_avg(&s->hw_volume) * (u->hw_volume_max - u->hw_volume_min) /
214 PA_VOLUME_NORM + u->hw_volume_min;
215 err = snd_mixer_selem_set_capture_volume_all(u->mixer_elem, vol);
221 for (i = 0;i < s->hw_volume.channels;i++) {
222 vol = s->hw_volume.values[i] * (u->hw_volume_max - u->hw_volume_min) /
223 PA_VOLUME_NORM + u->hw_volume_min;
224 err = snd_mixer_selem_set_capture_volume(u->mixer_elem, i, vol);
233 pa_log_error(__FILE__": Unable to set volume: %s", snd_strerror(err));
234 s->get_hw_volume = NULL;
235 s->set_hw_volume = NULL;
239 static int source_get_hw_mute_cb(pa_source *s) {
240 struct userdata *u = s->userdata;
243 assert(u && u->mixer_elem);
245 err = snd_mixer_selem_get_capture_switch(u->mixer_elem, 0, &sw);
247 pa_log_error(__FILE__": Unable to get switch: %s", snd_strerror(err));
248 s->get_hw_mute = NULL;
249 s->set_hw_mute = NULL;
258 static int source_set_hw_mute_cb(pa_source *s) {
259 struct userdata *u = s->userdata;
262 assert(u && u->mixer_elem);
264 err = snd_mixer_selem_set_capture_switch_all(u->mixer_elem, !s->hw_muted);
266 pa_log_error(__FILE__": Unable to set switch: %s", snd_strerror(err));
267 s->get_hw_mute = NULL;
268 s->set_hw_mute = NULL;
275 int pa__init(pa_core *c, pa_module*m) {
276 pa_modargs *ma = NULL;
278 struct userdata *u = NULL;
281 unsigned periods, fragsize;
282 snd_pcm_uframes_t period_size;
286 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
287 pa_log(__FILE__": failed to parse module arguments");
291 ss = c->default_sample_spec;
292 if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
293 pa_log(__FILE__": failed to parse sample specification");
296 frame_size = pa_frame_size(&ss);
300 if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
301 pa_log(__FILE__": failed to parse buffer metrics");
304 period_size = fragsize;
306 u = pa_xmalloc0(sizeof(struct userdata));
310 snd_config_update_free_global();
311 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) {
312 pa_log(__FILE__": Error opening PCM device %s: %s", dev, snd_strerror(err));
316 if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &period_size)) < 0) {
317 pa_log(__FILE__": Failed to set hardware parameters: %s", snd_strerror(err));
321 if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0) {
322 pa_log(__FILE__": Error opening mixer: %s", snd_strerror(err));
326 if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
327 !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Capture"))) {
328 snd_mixer_close(u->mixer_handle);
329 u->mixer_handle = NULL;
332 u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, NULL);
335 u->source->userdata = u;
336 u->source->get_latency = source_get_latency_cb;
337 if (u->mixer_handle) {
338 assert(u->mixer_elem);
339 if (snd_mixer_selem_has_capture_volume(u->mixer_elem)) {
340 u->source->get_hw_volume = source_get_hw_volume_cb;
341 u->source->set_hw_volume = source_set_hw_volume_cb;
342 snd_mixer_selem_get_capture_volume_range(
343 u->mixer_elem, &u->hw_volume_min, &u->hw_volume_max);
345 if (snd_mixer_selem_has_capture_switch(u->mixer_elem)) {
346 u->source->get_hw_mute = source_get_hw_mute_cb;
347 u->source->set_hw_mute = source_set_hw_mute_cb;
350 pa_source_set_owner(u->source, m);
351 u->source->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s'", dev);
353 if (pa_create_io_events(u->pcm_handle, c->mainloop, &u->io_events, &u->n_io_events, io_callback, u) < 0) {
354 pa_log(__FILE__": failed to obtain file descriptors");
358 u->frame_size = frame_size;
359 u->fragment_size = period_size;
361 pa_log(__FILE__": using %u fragments of size %u bytes.", periods, u->fragment_size);
363 u->memchunk.memblock = NULL;
364 u->memchunk.index = u->memchunk.length = 0;
366 snd_pcm_start(u->pcm_handle);
374 /* Get initial mixer settings */
375 if (u->source->get_hw_volume)
376 u->source->get_hw_volume(u->source);
377 if (u->source->get_hw_mute)
378 u->source->get_hw_mute(u->source);
390 void pa__done(pa_core *c, pa_module*m) {
394 if (!(u = m->userdata))
398 pa_source_disconnect(u->source);
399 pa_source_unref(u->source);
403 pa_free_io_events(c->mainloop, u->io_events, u->n_io_events);
406 snd_mixer_close(u->mixer_handle);
409 snd_pcm_drop(u->pcm_handle);
410 snd_pcm_close(u->pcm_handle);
413 if (u->memchunk.memblock)
414 pa_memblock_unref(u->memchunk.memblock);