src/modules/module-remap-sink.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2009 Lennart Poettering
   5
   6   PulseAudio 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 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio 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.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <pulse/xmalloc.h>
  27
  28 #include <pulsecore/namereg.h>
  29 #include <pulsecore/sink.h>
  30 #include <pulsecore/module.h>
  31 #include <pulsecore/core-util.h>
  32 #include <pulsecore/modargs.h>
  33 #include <pulsecore/log.h>
  34 #include <pulsecore/rtpoll.h>
  35
  36 #include "module-remap-sink-symdef.h"
  37
  38 PA_MODULE_AUTHOR("Lennart Poettering");
  39 PA_MODULE_DESCRIPTION("Virtual channel remapping sink");
  40 PA_MODULE_VERSION(PACKAGE_VERSION);
  41 PA_MODULE_LOAD_ONCE(FALSE);
  42 PA_MODULE_USAGE(
  43         "sink_name=<name for the sink> "
  44         "sink_properties=<properties for the sink> "
  45         "master=<name of sink to remap> "
  46         "master_channel_map=<channel map> "
  47         "format=<sample format> "
  48         "rate=<sample rate> "
  49         "channels=<number of channels> "
  50         "channel_map=<channel map> "
  51         "remix=<remix channels?>");
  52
  53 struct userdata {
  54     pa_module *module;
  55
  56     pa_sink *sink;
  57     pa_sink_input *sink_input;
  58
  59     pa_bool_t auto_desc;
  60 };
  61
  62 static const char* const valid_modargs[] = {
  63     "sink_name",
  64     "sink_properties",
  65     "master",
  66     "master_channel_map",
  67     "format",
  68     "rate",
  69     "channels",
  70     "channel_map",
  71     "remix",
  72     NULL
  73 };
  74
  75 /* Called from I/O thread context */
  76 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
  77     struct userdata *u = PA_SINK(o)->userdata;
  78
  79     switch (code) {
  80
  81         case PA_SINK_MESSAGE_GET_LATENCY:
  82
  83             /* The sink is _put() before the sink input is, so let's
  84              * make sure we don't access it yet */
  85             if (!PA_SINK_IS_LINKED(u->sink->thread_info.state) ||
  86                 !PA_SINK_INPUT_IS_LINKED(u->sink_input->thread_info.state)) {
  87                 *((pa_usec_t*) data) = 0;
  88                 return 0;
  89             }
  90
  91             *((pa_usec_t*) data) =
  92                 /* Get the latency of the master sink */
  93                 pa_sink_get_latency_within_thread(u->sink_input->sink) +
  94
  95                 /* Add the latency internal to our sink input on top */
  96                 pa_bytes_to_usec(pa_memblockq_get_length(u->sink_input->thread_info.render_memblockq), &u->sink_input->sink->sample_spec);
  97
  98             return 0;
  99     }
 100
 101     return pa_sink_process_msg(o, code, data, offset, chunk);
 102 }
 103
 104 /* Called from main context */
 105 static int sink_set_state(pa_sink *s, pa_sink_state_t state) {
 106     struct userdata *u;
 107
 108     pa_sink_assert_ref(s);
 109     pa_assert_se(u = s->userdata);
 110
 111     if (!PA_SINK_IS_LINKED(state) ||
 112         !PA_SINK_INPUT_IS_LINKED(pa_sink_input_get_state(u->sink_input)))
 113         return 0;
 114
 115     pa_sink_input_cork(u->sink_input, state == PA_SINK_SUSPENDED);
 116     return 0;
 117 }
 118
 119 /* Called from I/O thread context */
 120 static void sink_request_rewind(pa_sink *s) {
 121     struct userdata *u;
 122
 123     pa_sink_assert_ref(s);
 124     pa_assert_se(u = s->userdata);
 125
 126     if (!PA_SINK_IS_LINKED(u->sink->thread_info.state) ||
 127         !PA_SINK_INPUT_IS_LINKED(u->sink_input->thread_info.state))
 128         return;
 129
 130     pa_sink_input_request_rewind(u->sink_input, s->thread_info.rewind_nbytes, TRUE, FALSE, FALSE);
 131 }
 132
 133 /* Called from I/O thread context */
 134 static void sink_update_requested_latency(pa_sink *s) {
 135     struct userdata *u;
 136
 137     pa_sink_assert_ref(s);
 138     pa_assert_se(u = s->userdata);
 139
 140     if (!PA_SINK_IS_LINKED(u->sink->thread_info.state) ||
 141         !PA_SINK_INPUT_IS_LINKED(u->sink_input->thread_info.state))
 142         return;
 143
 144     /* Just hand this one over to the master sink */
 145     pa_sink_input_set_requested_latency_within_thread(
 146             u->sink_input,
 147             pa_sink_get_requested_latency_within_thread(s));
 148 }
 149
 150 /* Called from I/O thread context */
 151 static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk) {
 152     struct userdata *u;
 153
 154     pa_sink_input_assert_ref(i);
 155     pa_assert(chunk);
 156     pa_assert_se(u = i->userdata);
 157
 158     /* Hmm, process any rewind request that might be queued up */
 159     pa_sink_process_rewind(u->sink, 0);
 160
 161     pa_sink_render(u->sink, nbytes, chunk);
 162     return 0;
 163 }
 164
 165 /* Called from I/O thread context */
 166 static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
 167     size_t amount = 0;
 168     struct userdata *u;
 169
 170     pa_sink_input_assert_ref(i);
 171     pa_assert_se(u = i->userdata);
 172
 173     if (u->sink->thread_info.rewind_nbytes > 0) {
 174         amount = PA_MIN(u->sink->thread_info.rewind_nbytes, nbytes);
 175         u->sink->thread_info.rewind_nbytes = 0;
 176     }
 177
 178     pa_sink_process_rewind(u->sink, amount);
 179 }
 180
 181 /* Called from I/O thread context */
 182 static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
 183     struct userdata *u;
 184
 185     pa_sink_input_assert_ref(i);
 186     pa_assert_se(u = i->userdata);
 187
 188     /* FIXME: Too small max_rewind:
 189      * https://bugs.freedesktop.org/show_bug.cgi?id=53709 */
 190     pa_sink_set_max_rewind_within_thread(u->sink, nbytes);
 191 }
 192
 193 /* Called from I/O thread context */
 194 static void sink_input_update_max_request_cb(pa_sink_input *i, size_t nbytes) {
 195     struct userdata *u;
 196
 197     pa_sink_input_assert_ref(i);
 198     pa_assert_se(u = i->userdata);
 199
 200     pa_sink_set_max_request_within_thread(u->sink, nbytes);
 201 }
 202
 203 /* Called from I/O thread context */
 204 static void sink_input_update_sink_latency_range_cb(pa_sink_input *i) {
 205     struct userdata *u;
 206
 207     pa_sink_input_assert_ref(i);
 208     pa_assert_se(u = i->userdata);
 209
 210     pa_sink_set_latency_range_within_thread(u->sink, i->sink->thread_info.min_latency, i->sink->thread_info.max_latency);
 211 }
 212
 213 /* Called from I/O thread context */
 214 static void sink_input_update_sink_fixed_latency_cb(pa_sink_input *i) {
 215     struct userdata *u;
 216
 217     pa_sink_input_assert_ref(i);
 218     pa_assert_se(u = i->userdata);
 219
 220     pa_sink_set_fixed_latency_within_thread(u->sink, i->sink->thread_info.fixed_latency);
 221 }
 222
 223 /* Called from I/O thread context */
 224 static void sink_input_detach_cb(pa_sink_input *i) {
 225     struct userdata *u;
 226
 227     pa_sink_input_assert_ref(i);
 228     pa_assert_se(u = i->userdata);
 229
 230     pa_sink_detach_within_thread(u->sink);
 231
 232     pa_sink_set_rtpoll(u->sink, NULL);
 233 }
 234
 235 /* Called from I/O thread context */
 236 static void sink_input_attach_cb(pa_sink_input *i) {
 237     struct userdata *u;
 238
 239     pa_sink_input_assert_ref(i);
 240     pa_assert_se(u = i->userdata);
 241
 242     pa_sink_set_rtpoll(u->sink, i->sink->thread_info.rtpoll);
 243     pa_sink_set_latency_range_within_thread(u->sink, i->sink->thread_info.min_latency, i->sink->thread_info.max_latency);
 244     pa_sink_set_fixed_latency_within_thread(u->sink, i->sink->thread_info.fixed_latency);
 245     pa_sink_set_max_request_within_thread(u->sink, pa_sink_input_get_max_request(i));
 246
 247     /* FIXME: Too small max_rewind:
 248      * https://bugs.freedesktop.org/show_bug.cgi?id=53709 */
 249     pa_sink_set_max_rewind_within_thread(u->sink, pa_sink_input_get_max_rewind(i));
 250
 251     pa_sink_attach_within_thread(u->sink);
 252 }
 253
 254 /* Called from main context */
 255 static void sink_input_kill_cb(pa_sink_input *i) {
 256     struct userdata *u;
 257
 258     pa_sink_input_assert_ref(i);
 259     pa_assert_se(u = i->userdata);
 260
 261     /* The order here matters! We first kill the sink input, followed
 262      * by the sink. That means the sink callbacks must be protected
 263      * against an unconnected sink input! */
 264     pa_sink_input_unlink(u->sink_input);
 265     pa_sink_unlink(u->sink);
 266
 267     pa_sink_input_unref(u->sink_input);
 268     u->sink_input = NULL;
 269
 270     pa_sink_unref(u->sink);
 271     u->sink = NULL;
 272
 273     pa_module_unload_request(u->module, TRUE);
 274 }
 275
 276 /* Called from IO thread context */
 277 static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) {
 278     struct userdata *u;
 279
 280     pa_sink_input_assert_ref(i);
 281     pa_assert_se(u = i->userdata);
 282
 283     /* If we are added for the first time, ask for a rewinding so that
 284      * we are heard right-away. */
 285     if (PA_SINK_INPUT_IS_LINKED(state) &&
 286         i->thread_info.state == PA_SINK_INPUT_INIT) {
 287         pa_log_debug("Requesting rewind due to state change.");
 288         pa_sink_input_request_rewind(i, 0, FALSE, TRUE, TRUE);
 289     }
 290 }
 291
 292 /* Called from main context */
 293 static pa_bool_t sink_input_may_move_to_cb(pa_sink_input *i, pa_sink *dest) {
 294     struct userdata *u;
 295
 296     pa_sink_input_assert_ref(i);
 297     pa_assert_se(u = i->userdata);
 298
 299     return u->sink != dest;
 300 }
 301
 302 /* Called from main context */
 303 static void sink_input_moving_cb(pa_sink_input *i, pa_sink *dest) {
 304     struct userdata *u;
 305
 306     pa_sink_input_assert_ref(i);
 307     pa_assert_se(u = i->userdata);
 308
 309     if (dest) {
 310         pa_sink_set_asyncmsgq(u->sink, dest->asyncmsgq);
 311         pa_sink_update_flags(u->sink, PA_SINK_LATENCY|PA_SINK_DYNAMIC_LATENCY, dest->flags);
 312     } else
 313         pa_sink_set_asyncmsgq(u->sink, NULL);
 314
 315     if (u->auto_desc && dest) {
 316         const char *k;
 317         pa_proplist *pl;
 318
 319         pl = pa_proplist_new();
 320         k = pa_proplist_gets(dest->proplist, PA_PROP_DEVICE_DESCRIPTION);
 321         pa_proplist_setf(pl, PA_PROP_DEVICE_DESCRIPTION, "Remapped %s", k ? k : dest->name);
 322
 323         pa_sink_update_proplist(u->sink, PA_UPDATE_REPLACE, pl);
 324         pa_proplist_free(pl);
 325     }
 326 }
 327
 328 int pa__init(pa_module*m) {
 329     struct userdata *u;
 330     pa_sample_spec ss;
 331     pa_channel_map sink_map, stream_map;
 332     pa_modargs *ma;
 333     pa_sink *master;
 334     pa_sink_input_new_data sink_input_data;
 335     pa_sink_new_data sink_data;
 336     pa_bool_t remix = TRUE;
 337
 338     pa_assert(m);
 339
 340     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 341         pa_log("Failed to parse module arguments.");
 342         goto fail;
 343     }
 344
 345     if (!(master = pa_namereg_get(m->core, pa_modargs_get_value(ma, "master", NULL), PA_NAMEREG_SINK))) {
 346         pa_log("Master sink not found");
 347         goto fail;
 348     }
 349
 350     ss = master->sample_spec;
 351     sink_map = master->channel_map;
 352     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &sink_map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 353         pa_log("Invalid sample format specification or channel map");
 354         goto fail;
 355     }
 356
 357     stream_map = sink_map;
 358     if (pa_modargs_get_channel_map(ma, "master_channel_map", &stream_map) < 0) {
 359         pa_log("Invalid master channel map");
 360         goto fail;
 361     }
 362
 363     if (stream_map.channels != ss.channels) {
 364         pa_log("Number of channels doesn't match");
 365         goto fail;
 366     }
 367
 368     if (pa_channel_map_equal(&stream_map, &master->channel_map))
 369         pa_log_warn("No remapping configured, proceeding nonetheless!");
 370
 371     if (pa_modargs_get_value_boolean(ma, "remix", &remix) < 0) {
 372         pa_log("Invalid boolean remix parameter");
 373         goto fail;
 374     }
 375
 376     u = pa_xnew0(struct userdata, 1);
 377     u->module = m;
 378     m->userdata = u;
 379
 380     /* Create sink */
 381     pa_sink_new_data_init(&sink_data);
 382     sink_data.driver = __FILE__;
 383     sink_data.module = m;
 384     if (!(sink_data.name = pa_xstrdup(pa_modargs_get_value(ma, "sink_name", NULL))))
 385         sink_data.name = pa_sprintf_malloc("%s.remapped", master->name);
 386     pa_sink_new_data_set_sample_spec(&sink_data, &ss);
 387     pa_sink_new_data_set_channel_map(&sink_data, &sink_map);
 388     pa_proplist_sets(sink_data.proplist, PA_PROP_DEVICE_MASTER_DEVICE, master->name);
 389     pa_proplist_sets(sink_data.proplist, PA_PROP_DEVICE_CLASS, "filter");
 390
 391     if (pa_modargs_get_proplist(ma, "sink_properties", sink_data.proplist, PA_UPDATE_REPLACE) < 0) {
 392         pa_log("Invalid properties");
 393         pa_sink_new_data_done(&sink_data);
 394         goto fail;
 395     }
 396
 397     if ((u->auto_desc = !pa_proplist_contains(sink_data.proplist, PA_PROP_DEVICE_DESCRIPTION))) {
 398         const char *k;
 399
 400         k = pa_proplist_gets(master->proplist, PA_PROP_DEVICE_DESCRIPTION);
 401         pa_proplist_setf(sink_data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Remapped %s", k ? k : master->name);
 402     }
 403
 404     u->sink = pa_sink_new(m->core, &sink_data, master->flags & (PA_SINK_LATENCY|PA_SINK_DYNAMIC_LATENCY));
 405     pa_sink_new_data_done(&sink_data);
 406
 407     if (!u->sink) {
 408         pa_log("Failed to create sink.");
 409         goto fail;
 410     }
 411
 412     u->sink->parent.process_msg = sink_process_msg;
 413     u->sink->set_state = sink_set_state;
 414     u->sink->update_requested_latency = sink_update_requested_latency;
 415     u->sink->request_rewind = sink_request_rewind;
 416     u->sink->userdata = u;
 417
 418     pa_sink_set_asyncmsgq(u->sink, master->asyncmsgq);
 419
 420     /* Create sink input */
 421     pa_sink_input_new_data_init(&sink_input_data);
 422     sink_input_data.driver = __FILE__;
 423     sink_input_data.module = m;
 424     pa_sink_input_new_data_set_sink(&sink_input_data, master, FALSE);
 425     sink_input_data.origin_sink = u->sink;
 426     pa_proplist_sets(sink_input_data.proplist, PA_PROP_MEDIA_NAME, "Remapped Stream");
 427     pa_proplist_sets(sink_input_data.proplist, PA_PROP_MEDIA_ROLE, "filter");
 428     pa_sink_input_new_data_set_sample_spec(&sink_input_data, &ss);
 429     pa_sink_input_new_data_set_channel_map(&sink_input_data, &stream_map);
 430     sink_input_data.flags = (remix ? 0 : PA_SINK_INPUT_NO_REMIX);
 431
 432     pa_sink_input_new(&u->sink_input, m->core, &sink_input_data);
 433     pa_sink_input_new_data_done(&sink_input_data);
 434
 435     if (!u->sink_input)
 436         goto fail;
 437
 438     u->sink_input->pop = sink_input_pop_cb;
 439     u->sink_input->process_rewind = sink_input_process_rewind_cb;
 440     u->sink_input->update_max_rewind = sink_input_update_max_rewind_cb;
 441     u->sink_input->update_max_request = sink_input_update_max_request_cb;
 442     u->sink_input->update_sink_latency_range = sink_input_update_sink_latency_range_cb;
 443     u->sink_input->update_sink_fixed_latency = sink_input_update_sink_fixed_latency_cb;
 444     u->sink_input->attach = sink_input_attach_cb;
 445     u->sink_input->detach = sink_input_detach_cb;
 446     u->sink_input->kill = sink_input_kill_cb;
 447     u->sink_input->state_change = sink_input_state_change_cb;
 448     u->sink_input->may_move_to = sink_input_may_move_to_cb;
 449     u->sink_input->moving = sink_input_moving_cb;
 450     u->sink_input->userdata = u;
 451
 452     u->sink->input_to_master = u->sink_input;
 453
 454     pa_sink_put(u->sink);
 455     pa_sink_input_put(u->sink_input);
 456
 457     pa_modargs_free(ma);
 458
 459     return 0;
 460
 461 fail:
 462     if (ma)
 463         pa_modargs_free(ma);
 464
 465     pa__done(m);
 466
 467     return -1;
 468 }
 469
 470 int pa__get_n_used(pa_module *m) {
 471     struct userdata *u;
 472
 473     pa_assert(m);
 474     pa_assert_se(u = m->userdata);
 475
 476     return pa_sink_linked_by(u->sink);
 477 }
 478
 479 void pa__done(pa_module*m) {
 480     struct userdata *u;
 481
 482     pa_assert(m);
 483
 484     if (!(u = m->userdata))
 485         return;
 486
 487     /* See comments in sink_input_kill_cb() above regarding
 488      * destruction order! */
 489
 490     if (u->sink_input)
 491         pa_sink_input_unlink(u->sink_input);
 492
 493     if (u->sink)
 494         pa_sink_unlink(u->sink);
 495
 496     if (u->sink_input)
 497         pa_sink_input_unref(u->sink_input);
 498
 499     if (u->sink)
 500         pa_sink_unref(u->sink);
 501
 502     pa_xfree(u);
 503 }