2 This file is part of PulseAudio.
4 Copyright 2010 Intel Corporation
5 Contributor: Pierre-Louis Bossart <pierre-louis.bossart@intel.com>
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 2.1 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
23 /* TODO: Some plugins cause latency, and some even report it by using a control
24 out port. We don't currently use the latency information. */
30 #include <pulse/xmalloc.h>
31 #include <pulse/i18n.h>
33 #include <pulsecore/core-error.h>
34 #include <pulsecore/namereg.h>
35 #include <pulsecore/sink.h>
36 #include <pulsecore/module.h>
37 #include <pulsecore/core-util.h>
38 #include <pulsecore/modargs.h>
39 #include <pulsecore/log.h>
40 #include <pulsecore/thread.h>
41 #include <pulsecore/thread-mq.h>
42 #include <pulsecore/rtpoll.h>
43 #include <pulsecore/sample-util.h>
44 #include <pulsecore/ltdl-helper.h>
46 #include "module-virtual-sink-symdef.h"
48 PA_MODULE_AUTHOR("Pierre-Louis Bossart");
49 PA_MODULE_DESCRIPTION(_("Virtual sink"));
50 PA_MODULE_VERSION(PACKAGE_VERSION);
51 PA_MODULE_LOAD_ONCE(FALSE);
53 _("sink_name=<name for the sink> "
54 "sink_properties=<properties for the sink> "
55 "master=<name of sink to filter> "
56 "format=<sample format> "
58 "channels=<number of channels> "
59 "channel_map=<channel map> "
60 "use_volume_sharing=<yes or no> "
63 #define MEMBLOCKQ_MAXLENGTH (16*1024*1024)
69 pa_sink_input *sink_input;
71 pa_memblockq *memblockq;
77 static const char* const valid_modargs[] = {
89 /* Called from I/O thread context */
90 static int sink_process_msg_cb(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
91 struct userdata *u = PA_SINK(o)->userdata;
95 case PA_SINK_MESSAGE_GET_LATENCY:
97 /* The sink is _put() before the sink input is, so let's
98 * make sure we don't access it in that time. Also, the
99 * sink input is first shut down, the sink second. */
100 if (!PA_SINK_IS_LINKED(u->sink->thread_info.state) ||
101 !PA_SINK_INPUT_IS_LINKED(u->sink_input->thread_info.state)) {
102 *((pa_usec_t*) data) = 0;
106 *((pa_usec_t*) data) =
108 /* Get the latency of the master sink */
109 pa_sink_get_latency_within_thread(u->sink_input->sink) +
111 /* Add the latency internal to our sink input on top */
112 pa_bytes_to_usec(pa_memblockq_get_length(u->sink_input->thread_info.render_memblockq), &u->sink_input->sink->sample_spec);
117 return pa_sink_process_msg(o, code, data, offset, chunk);
120 /* Called from main context */
121 static int sink_set_state_cb(pa_sink *s, pa_sink_state_t state) {
124 pa_sink_assert_ref(s);
125 pa_assert_se(u = s->userdata);
127 if (!PA_SINK_IS_LINKED(state) ||
128 !PA_SINK_INPUT_IS_LINKED(pa_sink_input_get_state(u->sink_input)))
131 pa_sink_input_cork(u->sink_input, state == PA_SINK_SUSPENDED);
135 /* Called from I/O thread context */
136 static void sink_request_rewind_cb(pa_sink *s) {
139 pa_sink_assert_ref(s);
140 pa_assert_se(u = s->userdata);
142 if (!PA_SINK_IS_LINKED(u->sink->thread_info.state) ||
143 !PA_SINK_INPUT_IS_LINKED(u->sink_input->thread_info.state))
146 /* Just hand this one over to the master sink */
147 pa_sink_input_request_rewind(u->sink_input,
148 s->thread_info.rewind_nbytes +
149 pa_memblockq_get_length(u->memblockq), TRUE, FALSE, FALSE);
152 /* Called from I/O thread context */
153 static void sink_update_requested_latency_cb(pa_sink *s) {
156 pa_sink_assert_ref(s);
157 pa_assert_se(u = s->userdata);
159 if (!PA_SINK_IS_LINKED(u->sink->thread_info.state) ||
160 !PA_SINK_INPUT_IS_LINKED(u->sink_input->thread_info.state))
163 /* Just hand this one over to the master sink */
164 pa_sink_input_set_requested_latency_within_thread(
166 pa_sink_get_requested_latency_within_thread(s));
169 /* Called from main context */
170 static void sink_set_volume_cb(pa_sink *s) {
173 pa_sink_assert_ref(s);
174 pa_assert_se(u = s->userdata);
176 if (!PA_SINK_IS_LINKED(pa_sink_get_state(s)) ||
177 !PA_SINK_INPUT_IS_LINKED(pa_sink_input_get_state(u->sink_input)))
180 pa_sink_input_set_volume(u->sink_input, &s->real_volume, s->save_volume, TRUE);
183 /* Called from main context */
184 static void sink_set_mute_cb(pa_sink *s) {
187 pa_sink_assert_ref(s);
188 pa_assert_se(u = s->userdata);
190 if (!PA_SINK_IS_LINKED(pa_sink_get_state(s)) ||
191 !PA_SINK_INPUT_IS_LINKED(pa_sink_input_get_state(u->sink_input)))
194 pa_sink_input_set_mute(u->sink_input, s->muted, s->save_muted);
197 /* Called from I/O thread context */
198 static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk) {
204 pa_usec_t current_latency;
206 pa_sink_input_assert_ref(i);
208 pa_assert_se(u = i->userdata);
210 /* Hmm, process any rewind request that might be queued up */
211 pa_sink_process_rewind(u->sink, 0);
213 /* (1) IF YOU NEED A FIXED BLOCK SIZE USE
214 * pa_memblockq_peek_fixed_size() HERE INSTEAD. NOTE THAT FILTERS
215 * WHICH CAN DEAL WITH DYNAMIC BLOCK SIZES ARE HIGHLY
217 while (pa_memblockq_peek(u->memblockq, &tchunk) < 0) {
220 pa_sink_render(u->sink, nbytes, &nchunk);
221 pa_memblockq_push(u->memblockq, &nchunk);
222 pa_memblock_unref(nchunk.memblock);
225 /* (2) IF YOU NEED A FIXED BLOCK SIZE, THIS NEXT LINE IS NOT
227 tchunk.length = PA_MIN(nbytes, tchunk.length);
228 pa_assert(tchunk.length > 0);
230 fs = pa_frame_size(&i->sample_spec);
231 n = (unsigned) (tchunk.length / fs);
236 chunk->length = n*fs;
237 chunk->memblock = pa_memblock_new(i->sink->core->mempool, chunk->length);
239 pa_memblockq_drop(u->memblockq, chunk->length);
241 src = (float*) ((uint8_t*) pa_memblock_acquire(tchunk.memblock) + tchunk.index);
242 dst = (float*) pa_memblock_acquire(chunk->memblock);
244 /* (3) PUT YOUR CODE HERE TO DO SOMETHING WITH THE DATA */
246 /* As an example, copy input to output */
247 for (c = 0; c < u->channels; c++) {
248 pa_sample_clamp(PA_SAMPLE_FLOAT32NE,
249 dst+c, u->channels * sizeof(float),
250 src+c, u->channels * sizeof(float),
254 pa_memblock_release(tchunk.memblock);
255 pa_memblock_release(chunk->memblock);
257 pa_memblock_unref(tchunk.memblock);
259 /* (4) IF YOU NEED THE LATENCY FOR SOMETHING ACQUIRE IT LIKE THIS: */
261 /* Get the latency of the master sink */
262 pa_sink_get_latency_within_thread(i->sink) +
264 /* Add the latency internal to our sink input on top */
265 pa_bytes_to_usec(pa_memblockq_get_length(i->thread_info.render_memblockq), &i->sink->sample_spec);
270 /* Called from I/O thread context */
271 static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
275 pa_sink_input_assert_ref(i);
276 pa_assert_se(u = i->userdata);
278 if (u->sink->thread_info.rewind_nbytes > 0) {
281 max_rewrite = nbytes + pa_memblockq_get_length(u->memblockq);
282 amount = PA_MIN(u->sink->thread_info.rewind_nbytes, max_rewrite);
283 u->sink->thread_info.rewind_nbytes = 0;
286 pa_memblockq_seek(u->memblockq, - (int64_t) amount, PA_SEEK_RELATIVE, TRUE);
288 /* (5) PUT YOUR CODE HERE TO RESET YOUR FILTER */
292 pa_sink_process_rewind(u->sink, amount);
293 pa_memblockq_rewind(u->memblockq, nbytes);
296 /* Called from I/O thread context */
297 static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
300 pa_sink_input_assert_ref(i);
301 pa_assert_se(u = i->userdata);
303 pa_memblockq_set_maxrewind(u->memblockq, nbytes);
304 pa_sink_set_max_rewind_within_thread(u->sink, nbytes);
307 /* Called from I/O thread context */
308 static void sink_input_update_max_request_cb(pa_sink_input *i, size_t nbytes) {
311 pa_sink_input_assert_ref(i);
312 pa_assert_se(u = i->userdata);
314 /* (6) IF YOU NEED A FIXED BLOCK SIZE ROUND nbytes UP TO MULTIPLES
315 * OF IT HERE. THE PA_ROUND_UP MACRO IS USEFUL FOR THAT. */
317 pa_sink_set_max_request_within_thread(u->sink, nbytes);
320 /* Called from I/O thread context */
321 static void sink_input_update_sink_latency_range_cb(pa_sink_input *i) {
324 pa_sink_input_assert_ref(i);
325 pa_assert_se(u = i->userdata);
327 pa_sink_set_latency_range_within_thread(u->sink, i->sink->thread_info.min_latency, i->sink->thread_info.max_latency);
330 /* Called from I/O thread context */
331 static void sink_input_update_sink_fixed_latency_cb(pa_sink_input *i) {
334 pa_sink_input_assert_ref(i);
335 pa_assert_se(u = i->userdata);
337 /* (7) IF YOU NEED A FIXED BLOCK SIZE ADD THE LATENCY FOR ONE
338 * BLOCK MINUS ONE SAMPLE HERE. pa_usec_to_bytes_round_up() IS
339 * USEFUL FOR THAT. */
341 pa_sink_set_fixed_latency_within_thread(u->sink, i->sink->thread_info.fixed_latency);
344 /* Called from I/O thread context */
345 static void sink_input_detach_cb(pa_sink_input *i) {
348 pa_sink_input_assert_ref(i);
349 pa_assert_se(u = i->userdata);
351 pa_sink_detach_within_thread(u->sink);
353 pa_sink_set_rtpoll(u->sink, NULL);
356 /* Called from I/O thread context */
357 static void sink_input_attach_cb(pa_sink_input *i) {
360 pa_sink_input_assert_ref(i);
361 pa_assert_se(u = i->userdata);
363 pa_sink_set_rtpoll(u->sink, i->sink->thread_info.rtpoll);
364 pa_sink_set_latency_range_within_thread(u->sink, i->sink->thread_info.min_latency, i->sink->thread_info.max_latency);
366 /* (8.1) IF YOU NEED A FIXED BLOCK SIZE ADD THE LATENCY FOR ONE
367 * BLOCK MINUS ONE SAMPLE HERE. SEE (7) */
368 pa_sink_set_fixed_latency_within_thread(u->sink, i->sink->thread_info.fixed_latency);
370 /* (8.2) IF YOU NEED A FIXED BLOCK SIZE ROUND
371 * pa_sink_input_get_max_request(i) UP TO MULTIPLES OF IT
373 pa_sink_set_max_request_within_thread(u->sink, pa_sink_input_get_max_request(i));
374 pa_sink_set_max_rewind_within_thread(u->sink, pa_sink_input_get_max_rewind(i));
376 pa_sink_attach_within_thread(u->sink);
379 /* Called from main context */
380 static void sink_input_kill_cb(pa_sink_input *i) {
383 pa_sink_input_assert_ref(i);
384 pa_assert_se(u = i->userdata);
386 /* The order here matters! We first kill the sink input, followed
387 * by the sink. That means the sink callbacks must be protected
388 * against an unconnected sink input! */
389 pa_sink_input_unlink(u->sink_input);
390 pa_sink_unlink(u->sink);
392 pa_sink_input_unref(u->sink_input);
393 u->sink_input = NULL;
395 pa_sink_unref(u->sink);
398 pa_module_unload_request(u->module, TRUE);
401 /* Called from IO thread context */
402 static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) {
405 pa_sink_input_assert_ref(i);
406 pa_assert_se(u = i->userdata);
408 /* If we are added for the first time, ask for a rewinding so that
409 * we are heard right-away. */
410 if (PA_SINK_INPUT_IS_LINKED(state) &&
411 i->thread_info.state == PA_SINK_INPUT_INIT) {
412 pa_log_debug("Requesting rewind due to state change.");
413 pa_sink_input_request_rewind(i, 0, FALSE, TRUE, TRUE);
417 /* Called from main context */
418 static pa_bool_t sink_input_may_move_to_cb(pa_sink_input *i, pa_sink *dest) {
421 pa_sink_input_assert_ref(i);
422 pa_assert_se(u = i->userdata);
424 return u->sink != dest;
427 /* Called from main context */
428 static void sink_input_moving_cb(pa_sink_input *i, pa_sink *dest) {
431 pa_sink_input_assert_ref(i);
432 pa_assert_se(u = i->userdata);
435 pa_sink_set_asyncmsgq(u->sink, dest->asyncmsgq);
436 pa_sink_update_flags(u->sink, PA_SINK_LATENCY|PA_SINK_DYNAMIC_LATENCY, dest->flags);
438 pa_sink_set_asyncmsgq(u->sink, NULL);
440 if (u->auto_desc && dest) {
444 pl = pa_proplist_new();
445 z = pa_proplist_gets(dest->proplist, PA_PROP_DEVICE_DESCRIPTION);
446 pa_proplist_setf(pl, PA_PROP_DEVICE_DESCRIPTION, "Virtual Sink %s on %s",
447 pa_proplist_gets(u->sink->proplist, "device.vsink.name"), z ? z : dest->name);
449 pa_sink_update_proplist(u->sink, PA_UPDATE_REPLACE, pl);
450 pa_proplist_free(pl);
454 /* Called from main context */
455 static void sink_input_volume_changed_cb(pa_sink_input *i) {
458 pa_sink_input_assert_ref(i);
459 pa_assert_se(u = i->userdata);
461 pa_sink_volume_changed(u->sink, &i->volume);
464 /* Called from main context */
465 static void sink_input_mute_changed_cb(pa_sink_input *i) {
468 pa_sink_input_assert_ref(i);
469 pa_assert_se(u = i->userdata);
471 pa_sink_mute_changed(u->sink, i->muted);
474 int pa__init(pa_module*m) {
479 pa_sink *master=NULL;
480 pa_sink_input_new_data sink_input_data;
481 pa_sink_new_data sink_data;
482 pa_bool_t *use_default = NULL;
483 pa_bool_t use_volume_sharing = FALSE;
487 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
488 pa_log("Failed to parse module arguments.");
492 if (!(master = pa_namereg_get(m->core, pa_modargs_get_value(ma, "master", NULL), PA_NAMEREG_SINK))) {
493 pa_log("Master sink not found");
499 ss = master->sample_spec;
500 ss.format = PA_SAMPLE_FLOAT32;
501 map = master->channel_map;
502 if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
503 pa_log("Invalid sample format specification or channel map");
507 if (pa_modargs_get_value_boolean(ma, "use_volume_sharing", &use_volume_sharing) < 0) {
508 pa_log("use_volume_sharing= expects a boolean argument");
512 u = pa_xnew0(struct userdata, 1);
515 u->channels = ss.channels;
518 pa_sink_new_data_init(&sink_data);
519 sink_data.driver = __FILE__;
520 sink_data.module = m;
521 if (!(sink_data.name = pa_xstrdup(pa_modargs_get_value(ma, "sink_name", NULL))))
522 sink_data.name = pa_sprintf_malloc("%s.vsink", master->name);
523 pa_sink_new_data_set_sample_spec(&sink_data, &ss);
524 pa_sink_new_data_set_channel_map(&sink_data, &map);
525 pa_proplist_sets(sink_data.proplist, PA_PROP_DEVICE_MASTER_DEVICE, master->name);
526 pa_proplist_sets(sink_data.proplist, PA_PROP_DEVICE_CLASS, "filter");
527 pa_proplist_sets(sink_data.proplist, "device.vsink.name", sink_data.name);
529 if (pa_modargs_get_proplist(ma, "sink_properties", sink_data.proplist, PA_UPDATE_REPLACE) < 0) {
530 pa_log("Invalid properties");
531 pa_sink_new_data_done(&sink_data);
535 if ((u->auto_desc = !pa_proplist_contains(sink_data.proplist, PA_PROP_DEVICE_DESCRIPTION))) {
538 z = pa_proplist_gets(master->proplist, PA_PROP_DEVICE_DESCRIPTION);
539 pa_proplist_setf(sink_data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Virtual Sink %s on %s", sink_data.name, z ? z : master->name);
542 u->sink = pa_sink_new(m->core, &sink_data, (master->flags & (PA_SINK_LATENCY|PA_SINK_DYNAMIC_LATENCY))
543 | (use_volume_sharing ? PA_SINK_SHARE_VOLUME_WITH_MASTER : 0));
544 pa_sink_new_data_done(&sink_data);
547 pa_log("Failed to create sink.");
551 u->sink->parent.process_msg = sink_process_msg_cb;
552 u->sink->set_state = sink_set_state_cb;
553 u->sink->update_requested_latency = sink_update_requested_latency_cb;
554 u->sink->request_rewind = sink_request_rewind_cb;
555 u->sink->set_volume = use_volume_sharing ? NULL : sink_set_volume_cb;
556 u->sink->set_mute = sink_set_mute_cb;
557 u->sink->userdata = u;
559 pa_sink_set_asyncmsgq(u->sink, master->asyncmsgq);
561 /* Create sink input */
562 pa_sink_input_new_data_init(&sink_input_data);
563 sink_input_data.driver = __FILE__;
564 sink_input_data.module = m;
565 sink_input_data.sink = master;
566 sink_input_data.origin_sink = u->sink;
567 pa_proplist_sets(sink_input_data.proplist, PA_PROP_MEDIA_NAME, "Virtual Sink Stream");
568 pa_proplist_sets(sink_input_data.proplist, PA_PROP_MEDIA_ROLE, "filter");
569 pa_sink_input_new_data_set_sample_spec(&sink_input_data, &ss);
570 pa_sink_input_new_data_set_channel_map(&sink_input_data, &map);
572 pa_sink_input_new(&u->sink_input, m->core, &sink_input_data);
573 pa_sink_input_new_data_done(&sink_input_data);
578 u->sink_input->pop = sink_input_pop_cb;
579 u->sink_input->process_rewind = sink_input_process_rewind_cb;
580 u->sink_input->update_max_rewind = sink_input_update_max_rewind_cb;
581 u->sink_input->update_max_request = sink_input_update_max_request_cb;
582 u->sink_input->update_sink_latency_range = sink_input_update_sink_latency_range_cb;
583 u->sink_input->update_sink_fixed_latency = sink_input_update_sink_fixed_latency_cb;
584 u->sink_input->kill = sink_input_kill_cb;
585 u->sink_input->attach = sink_input_attach_cb;
586 u->sink_input->detach = sink_input_detach_cb;
587 u->sink_input->state_change = sink_input_state_change_cb;
588 u->sink_input->may_move_to = sink_input_may_move_to_cb;
589 u->sink_input->moving = sink_input_moving_cb;
590 u->sink_input->volume_changed = use_volume_sharing ? NULL : sink_input_volume_changed_cb;
591 u->sink_input->mute_changed = sink_input_mute_changed_cb;
592 u->sink_input->userdata = u;
594 u->sink->input_to_master = u->sink_input;
596 /* (9) IF YOU REQUIRE A FIXED BLOCK SIZE MAKE SURE TO PASS A
597 * SILENCE MEMBLOCK AS LAST PARAMETER
598 * HERE. pa_sink_input_get_silence() IS USEFUL HERE. */
599 u->memblockq = pa_memblockq_new(0, MEMBLOCKQ_MAXLENGTH, 0, pa_frame_size(&ss), 1, 1, 0, NULL);
601 /* (10) INITIALIZE ANYTHING ELSE YOU NEED HERE */
603 pa_sink_put(u->sink);
604 pa_sink_input_put(u->sink_input);
608 pa_xfree(use_default);
616 pa_xfree(use_default);
623 int pa__get_n_used(pa_module *m) {
627 pa_assert_se(u = m->userdata);
629 return pa_sink_linked_by(u->sink);
632 void pa__done(pa_module*m) {
637 if (!(u = m->userdata))
640 /* See comments in sink_input_kill_cb() above regarding
641 * destruction order! */
644 pa_sink_input_unlink(u->sink_input);
647 pa_sink_unlink(u->sink);
650 pa_sink_input_unref(u->sink_input);
653 pa_sink_unref(u->sink);
656 pa_memblockq_free(u->memblockq);