code.delx.au - pulseaudio/blob - src/modules/rtp/module-rtp-recv.c

   1
   2 /***
   3   This file is part of PulseAudio.
   4
   5   Copyright 2006 Lennart Poettering
   6
   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 of the License,
  10   or (at your option) any later version.
  11
  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.
  16
  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
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <stdio.h>
  28 #include <sys/socket.h>
  29 #include <netinet/in.h>
  30 #include <arpa/inet.h>
  31 #include <errno.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34 #include <poll.h>
  35
  36 #include <pulse/timeval.h>
  37 #include <pulse/xmalloc.h>
  38
  39 #include <pulsecore/core-error.h>
  40 #include <pulsecore/module.h>
  41 #include <pulsecore/llist.h>
  42 #include <pulsecore/sink.h>
  43 #include <pulsecore/sink-input.h>
  44 #include <pulsecore/memblockq.h>
  45 #include <pulsecore/log.h>
  46 #include <pulsecore/core-util.h>
  47 #include <pulsecore/modargs.h>
  48 #include <pulsecore/namereg.h>
  49 #include <pulsecore/sample-util.h>
  50 #include <pulsecore/macro.h>
  51 #include <pulsecore/atomic.h>
  52 #include <pulsecore/rtclock.h>
  53 #include <pulsecore/atomic.h>
  54 #include <pulsecore/time-smoother.h>
  55
  56 #include "module-rtp-recv-symdef.h"
  57
  58 #include "rtp.h"
  59 #include "sdp.h"
  60 #include "sap.h"
  61
  62 PA_MODULE_AUTHOR("Lennart Poettering");
  63 PA_MODULE_DESCRIPTION("Recieve data from a network via RTP/SAP/SDP");
  64 PA_MODULE_VERSION(PACKAGE_VERSION);
  65 PA_MODULE_LOAD_ONCE(FALSE);
  66 PA_MODULE_USAGE(
  67         "sink=<name of the sink> "
  68         "sap_address=<multicast address to listen on> "
  69 );
  70
  71 #define SAP_PORT 9875
  72 #define DEFAULT_SAP_ADDRESS "224.0.0.56"
  73 #define MEMBLOCKQ_MAXLENGTH (1024*1024*40)
  74 #define MAX_SESSIONS 16
  75 #define DEATH_TIMEOUT 20
  76 #define RATE_UPDATE_INTERVAL (5*PA_USEC_PER_SEC)
  77 #define LATENCY_USEC (500*PA_USEC_PER_MSEC)
  78
  79 static const char* const valid_modargs[] = {
  80     "sink",
  81     "sap_address",
  82     NULL
  83 };
  84
  85 struct session {
  86     struct userdata *userdata;
  87     PA_LLIST_FIELDS(struct session);
  88
  89     pa_sink_input *sink_input;
  90     pa_memblockq *memblockq;
  91
  92     pa_bool_t first_packet;
  93     uint32_t ssrc;
  94     uint32_t offset;
  95
  96     struct pa_sdp_info sdp_info;
  97
  98     pa_rtp_context rtp_context;
  99
 100     pa_rtpoll_item *rtpoll_item;
 101
 102     pa_atomic_t timestamp;
 103
 104     pa_smoother *smoother;
 105     pa_usec_t intended_latency;
 106     pa_usec_t sink_latency;
 107
 108     pa_usec_t last_rate_update;
 109 };
 110
 111 struct userdata {
 112     pa_module *module;
 113
 114     pa_sap_context sap_context;
 115     pa_io_event* sap_event;
 116
 117     pa_time_event *check_death_event;
 118
 119     char *sink_name;
 120
 121     PA_LLIST_HEAD(struct session, sessions);
 122     pa_hashmap *by_origin;
 123     int n_sessions;
 124 };
 125
 126 static void session_free(struct session *s);
 127
 128 /* Called from I/O thread context */
 129 static int sink_input_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 130     struct session *s = PA_SINK_INPUT(o)->userdata;
 131
 132     switch (code) {
 133         case PA_SINK_INPUT_MESSAGE_GET_LATENCY:
 134             *((pa_usec_t*) data) = pa_bytes_to_usec(pa_memblockq_get_length(s->memblockq), &s->sink_input->sample_spec);
 135
 136             /* Fall through, the default handler will add in the extra
 137              * latency added by the resampler */
 138             break;
 139     }
 140
 141     return pa_sink_input_process_msg(o, code, data, offset, chunk);
 142 }
 143
 144 /* Called from I/O thread context */
 145 static int sink_input_pop_cb(pa_sink_input *i, size_t length, pa_memchunk *chunk) {
 146     struct session *s;
 147     pa_sink_input_assert_ref(i);
 148     pa_assert_se(s = i->userdata);
 149
 150     if (pa_memblockq_peek(s->memblockq, chunk) < 0)
 151         return -1;
 152
 153     pa_memblockq_drop(s->memblockq, chunk->length);
 154
 155     return 0;
 156 }
 157
 158 /* Called from I/O thread context */
 159 static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
 160     struct session *s;
 161
 162     pa_sink_input_assert_ref(i);
 163     pa_assert_se(s = i->userdata);
 164
 165     pa_memblockq_rewind(s->memblockq, nbytes);
 166 }
 167
 168 /* Called from thread context */
 169 static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
 170     struct session *s;
 171
 172     pa_sink_input_assert_ref(i);
 173     pa_assert_se(s = i->userdata);
 174
 175     pa_memblockq_set_maxrewind(s->memblockq, nbytes);
 176 }
 177
 178 /* Called from main context */
 179 static void sink_input_kill(pa_sink_input* i) {
 180     struct session *s;
 181     pa_sink_input_assert_ref(i);
 182     pa_assert_se(s = i->userdata);
 183
 184     session_free(s);
 185 }
 186
 187 /* Called from I/O thread context */
 188 static int rtpoll_work_cb(pa_rtpoll_item *i) {
 189     pa_memchunk chunk;
 190     int64_t k, j, delta;
 191     struct timeval now;
 192     struct session *s;
 193     struct pollfd *p;
 194
 195     pa_assert_se(s = pa_rtpoll_item_get_userdata(i));
 196
 197     p = pa_rtpoll_item_get_pollfd(i, NULL);
 198
 199     if (p->revents & (POLLERR|POLLNVAL|POLLHUP|POLLOUT)) {
 200         pa_log("poll() signalled bad revents.");
 201         return -1;
 202     }
 203
 204     if ((p->revents & POLLIN) == 0)
 205         return 0;
 206
 207     p->revents = 0;
 208
 209     if (pa_rtp_recv(&s->rtp_context, &chunk, s->userdata->module->core->mempool) < 0)
 210         return 0;
 211
 212     if (s->sdp_info.payload != s->rtp_context.payload) {
 213         pa_memblock_unref(chunk.memblock);
 214         return 0;
 215     }
 216
 217     if (!s->first_packet) {
 218         s->first_packet = TRUE;
 219
 220         s->ssrc = s->rtp_context.ssrc;
 221         s->offset = s->rtp_context.timestamp;
 222
 223         if (s->ssrc == s->userdata->module->core->cookie)
 224             pa_log_warn("Detected RTP packet loop!");
 225     } else {
 226         if (s->ssrc != s->rtp_context.ssrc) {
 227             pa_memblock_unref(chunk.memblock);
 228             return 0;
 229         }
 230     }
 231
 232     /* Check wheter there was a timestamp overflow */
 233     k = (int64_t) s->rtp_context.timestamp - (int64_t) s->offset;
 234     j = (int64_t) 0x100000000LL - (int64_t) s->offset + (int64_t) s->rtp_context.timestamp;
 235
 236     if ((k < 0 ? -k : k) < (j < 0 ? -j : j))
 237         delta = k;
 238     else
 239         delta = j;
 240
 241     pa_memblockq_seek(s->memblockq, delta * s->rtp_context.frame_size, PA_SEEK_RELATIVE);
 242
 243     pa_rtclock_get(&now);
 244
 245     pa_smoother_put(s->smoother, pa_timeval_load(&now), pa_bytes_to_usec(pa_memblockq_get_write_index(s->memblockq), &s->sink_input->sample_spec));
 246
 247     if (pa_memblockq_push(s->memblockq, &chunk) < 0) {
 248         pa_log_warn("Queue overrun");
 249         pa_memblockq_seek(s->memblockq, chunk.length, PA_SEEK_RELATIVE);
 250     }
 251
 252     pa_log("blocks in q: %u", pa_memblockq_get_nblocks(s->memblockq));
 253
 254     pa_memblock_unref(chunk.memblock);
 255
 256     /* The next timestamp we expect */
 257     s->offset = s->rtp_context.timestamp + (chunk.length / s->rtp_context.frame_size);
 258
 259     pa_atomic_store(&s->timestamp, now.tv_sec);
 260
 261     if (s->last_rate_update + RATE_UPDATE_INTERVAL < pa_timeval_load(&now)) {
 262         pa_usec_t wi, ri, render_delay, sink_delay = 0, latency, fix;
 263         unsigned fix_samples;
 264
 265         pa_log("Updating sample rate");
 266
 267         wi = pa_smoother_get(s->smoother, pa_timeval_load(&now));
 268         ri = pa_bytes_to_usec(pa_memblockq_get_read_index(s->memblockq), &s->sink_input->sample_spec);
 269
 270         if (PA_MSGOBJECT(s->sink_input->sink)->process_msg(PA_MSGOBJECT(s->sink_input->sink), PA_SINK_MESSAGE_GET_LATENCY, &sink_delay, 0, NULL) < 0)
 271             sink_delay = 0;
 272
 273         render_delay = pa_bytes_to_usec(pa_memblockq_get_length(s->sink_input->thread_info.render_memblockq), &s->sink_input->sink->sample_spec);
 274
 275         if (ri > render_delay+sink_delay)
 276             ri -= render_delay+sink_delay;
 277         else
 278             ri = 0;
 279
 280         if (wi < ri)
 281             latency = 0;
 282         else
 283             latency = wi - ri;
 284
 285         pa_log_debug("Write index deviates by %0.2f ms, expected %0.2f ms", (double) latency/PA_USEC_PER_MSEC, (double)  s->intended_latency/PA_USEC_PER_MSEC);
 286
 287         /* Calculate deviation */
 288         if (latency < s->intended_latency)
 289             fix = s->intended_latency - latency;
 290         else
 291             fix = latency - s->intended_latency;
 292
 293         /* How many samples is this per second? */
 294         fix_samples = fix * s->sink_input->thread_info.sample_spec.rate / RATE_UPDATE_INTERVAL;
 295
 296         /* Check if deviation is in bounds */
 297         if (fix_samples > s->sink_input->sample_spec.rate*.20)
 298             pa_log_debug("Hmmm, rate fix is too large (%lu Hz), not applying.", (unsigned long) fix_samples);
 299
 300         /* Fix up rate */
 301         if (latency < s->intended_latency)
 302             s->sink_input->sample_spec.rate -= fix_samples;
 303         else
 304             s->sink_input->sample_spec.rate += fix_samples;
 305
 306         pa_resampler_set_input_rate(s->sink_input->thread_info.resampler, s->sink_input->sample_spec.rate);
 307
 308         pa_log_debug("Updated sampling rate to %lu Hz.", (unsigned long) s->sink_input->sample_spec.rate);
 309
 310         s->last_rate_update = pa_timeval_load(&now);
 311     }
 312
 313     if (pa_memblockq_is_readable(s->memblockq) &&
 314         s->sink_input->thread_info.underrun_for > 0) {
 315         pa_log_debug("Requesting rewind due to end of underrun");
 316         pa_sink_input_request_rewind(s->sink_input, 0, FALSE, TRUE);
 317     }
 318
 319     return 1;
 320 }
 321
 322 /* Called from I/O thread context */
 323 static void sink_input_attach(pa_sink_input *i) {
 324     struct session *s;
 325     struct pollfd *p;
 326
 327     pa_sink_input_assert_ref(i);
 328     pa_assert_se(s = i->userdata);
 329
 330     pa_assert(!s->rtpoll_item);
 331     s->rtpoll_item = pa_rtpoll_item_new(i->sink->rtpoll, PA_RTPOLL_LATE, 1);
 332
 333     p = pa_rtpoll_item_get_pollfd(s->rtpoll_item, NULL);
 334     p->fd = s->rtp_context.fd;
 335     p->events = POLLIN;
 336     p->revents = 0;
 337
 338     pa_rtpoll_item_set_work_callback(s->rtpoll_item, rtpoll_work_cb);
 339     pa_rtpoll_item_set_userdata(s->rtpoll_item, s);
 340 }
 341
 342 /* Called from I/O thread context */
 343 static void sink_input_detach(pa_sink_input *i) {
 344     struct session *s;
 345     pa_sink_input_assert_ref(i);
 346     pa_assert_se(s = i->userdata);
 347
 348     pa_assert(s->rtpoll_item);
 349     pa_rtpoll_item_free(s->rtpoll_item);
 350     s->rtpoll_item = NULL;
 351 }
 352
 353 static int mcast_socket(const struct sockaddr* sa, socklen_t salen) {
 354     int af, fd = -1, r, one;
 355
 356     pa_assert(sa);
 357     pa_assert(salen > 0);
 358
 359     af = sa->sa_family;
 360     if ((fd = socket(af, SOCK_DGRAM, 0)) < 0) {
 361         pa_log("Failed to create socket: %s", pa_cstrerror(errno));
 362         goto fail;
 363     }
 364
 365     one = 1;
 366     if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0) {
 367         pa_log("SO_REUSEADDR failed: %s", pa_cstrerror(errno));
 368         goto fail;
 369     }
 370
 371     if (af == AF_INET) {
 372         struct ip_mreq mr4;
 373         memset(&mr4, 0, sizeof(mr4));
 374         mr4.imr_multiaddr = ((const struct sockaddr_in*) sa)->sin_addr;
 375         r = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mr4, sizeof(mr4));
 376     } else {
 377         struct ipv6_mreq mr6;
 378         memset(&mr6, 0, sizeof(mr6));
 379         mr6.ipv6mr_multiaddr = ((const struct sockaddr_in6*) sa)->sin6_addr;
 380         r = setsockopt(fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mr6, sizeof(mr6));
 381     }
 382
 383     if (r < 0) {
 384         pa_log_info("Joining mcast group failed: %s", pa_cstrerror(errno));
 385         goto fail;
 386     }
 387
 388     if (bind(fd, sa, salen) < 0) {
 389         pa_log("bind() failed: %s", pa_cstrerror(errno));
 390         goto fail;
 391     }
 392
 393     return fd;
 394
 395 fail:
 396     if (fd >= 0)
 397         close(fd);
 398
 399     return -1;
 400 }
 401
 402 static struct session *session_new(struct userdata *u, const pa_sdp_info *sdp_info) {
 403     struct session *s = NULL;
 404     pa_sink *sink;
 405     int fd = -1;
 406     pa_memchunk silence;
 407     pa_sink_input_new_data data;
 408     struct timeval now;
 409
 410     pa_assert(u);
 411     pa_assert(sdp_info);
 412
 413     if (u->n_sessions >= MAX_SESSIONS) {
 414         pa_log("Session limit reached.");
 415         goto fail;
 416     }
 417
 418     if (!(sink = pa_namereg_get(u->module->core, u->sink_name, PA_NAMEREG_SINK, TRUE))) {
 419         pa_log("Sink does not exist.");
 420         goto fail;
 421     }
 422
 423     pa_rtclock_get(&now);
 424
 425     s = pa_xnew0(struct session, 1);
 426     s->userdata = u;
 427     s->first_packet = FALSE;
 428     s->sdp_info = *sdp_info;
 429     s->rtpoll_item = NULL;
 430     s->intended_latency = LATENCY_USEC;
 431     s->smoother = pa_smoother_new(PA_USEC_PER_SEC*5, PA_USEC_PER_SEC*2, TRUE, 10);
 432     pa_smoother_set_time_offset(s->smoother, pa_timeval_load(&now));
 433     s->last_rate_update = pa_timeval_load(&now);
 434     pa_atomic_store(&s->timestamp, now.tv_sec);
 435
 436     if ((fd = mcast_socket((const struct sockaddr*) &sdp_info->sa, sdp_info->salen)) < 0)
 437         goto fail;
 438
 439     pa_sink_input_new_data_init(&data);
 440     data.sink = sink;
 441     data.driver = __FILE__;
 442     pa_proplist_sets(data.proplist, PA_PROP_MEDIA_ROLE, "stream");
 443     pa_proplist_setf(data.proplist, PA_PROP_MEDIA_NAME,
 444                      "RTP Stream%s%s%s",
 445                      sdp_info->session_name ? " (" : "",
 446                      sdp_info->session_name ? sdp_info->session_name : "",
 447                      sdp_info->session_name ? ")" : "");
 448
 449     if (sdp_info->session_name)
 450         pa_proplist_sets(data.proplist, "rtp.session", sdp_info->session_name);
 451     pa_proplist_sets(data.proplist, "rtp.origin", sdp_info->origin);
 452     pa_proplist_setf(data.proplist, "rtp.payload", "%u", (unsigned) sdp_info->payload);
 453     data.module = u->module;
 454     pa_sink_input_new_data_set_sample_spec(&data, &sdp_info->sample_spec);
 455
 456     s->sink_input = pa_sink_input_new(u->module->core, &data, 0);
 457     pa_sink_input_new_data_done(&data);
 458
 459     if (!s->sink_input) {
 460         pa_log("Failed to create sink input.");
 461         goto fail;
 462     }
 463
 464     s->sink_input->userdata = s;
 465
 466     s->sink_input->parent.process_msg = sink_input_process_msg;
 467     s->sink_input->pop = sink_input_pop_cb;
 468     s->sink_input->process_rewind = sink_input_process_rewind_cb;
 469     s->sink_input->update_max_rewind = sink_input_update_max_rewind_cb;
 470     s->sink_input->kill = sink_input_kill;
 471     s->sink_input->attach = sink_input_attach;
 472     s->sink_input->detach = sink_input_detach;
 473
 474     pa_sink_input_get_silence(s->sink_input, &silence);
 475
 476     s->sink_latency = pa_sink_input_set_requested_latency(s->sink_input, s->intended_latency/2);
 477
 478     if (s->intended_latency < s->sink_latency*2)
 479         s->intended_latency = s->sink_latency*2;
 480
 481     s->memblockq = pa_memblockq_new(
 482             0,
 483             MEMBLOCKQ_MAXLENGTH,
 484             MEMBLOCKQ_MAXLENGTH,
 485             pa_frame_size(&s->sink_input->sample_spec),
 486             pa_usec_to_bytes(s->intended_latency - s->sink_latency, &s->sink_input->sample_spec),
 487             0,
 488             0,
 489             &silence);
 490
 491     pa_memblock_unref(silence.memblock);
 492
 493     pa_rtp_context_init_recv(&s->rtp_context, fd, pa_frame_size(&s->sdp_info.sample_spec));
 494
 495     pa_hashmap_put(s->userdata->by_origin, s->sdp_info.origin, s);
 496     u->n_sessions++;
 497     PA_LLIST_PREPEND(struct session, s->userdata->sessions, s);
 498
 499     pa_sink_input_put(s->sink_input);
 500
 501     pa_log_info("New session '%s'", s->sdp_info.session_name);
 502
 503     return s;
 504
 505 fail:
 506     pa_xfree(s);
 507
 508     if (fd >= 0)
 509         pa_close(fd);
 510
 511     return NULL;
 512 }
 513
 514 static void session_free(struct session *s) {
 515     pa_assert(s);
 516
 517     pa_log_info("Freeing session '%s'", s->sdp_info.session_name);
 518
 519     pa_sink_input_unlink(s->sink_input);
 520     pa_sink_input_unref(s->sink_input);
 521
 522     PA_LLIST_REMOVE(struct session, s->userdata->sessions, s);
 523     pa_assert(s->userdata->n_sessions >= 1);
 524     s->userdata->n_sessions--;
 525     pa_hashmap_remove(s->userdata->by_origin, s->sdp_info.origin);
 526
 527     pa_memblockq_free(s->memblockq);
 528     pa_sdp_info_destroy(&s->sdp_info);
 529     pa_rtp_context_destroy(&s->rtp_context);
 530
 531     pa_smoother_free(s->smoother);
 532
 533     pa_xfree(s);
 534 }
 535
 536 static void sap_event_cb(pa_mainloop_api *m, pa_io_event *e, int fd, pa_io_event_flags_t flags, void *userdata) {
 537     struct userdata *u = userdata;
 538     pa_bool_t goodbye = FALSE;
 539     pa_sdp_info info;
 540     struct session *s;
 541
 542     pa_assert(m);
 543     pa_assert(e);
 544     pa_assert(u);
 545     pa_assert(fd == u->sap_context.fd);
 546     pa_assert(flags == PA_IO_EVENT_INPUT);
 547
 548     if (pa_sap_recv(&u->sap_context, &goodbye) < 0)
 549         return;
 550
 551     if (!pa_sdp_parse(u->sap_context.sdp_data, &info, goodbye))
 552         return;
 553
 554     if (goodbye) {
 555
 556         if ((s = pa_hashmap_get(u->by_origin, info.origin)))
 557             session_free(s);
 558
 559         pa_sdp_info_destroy(&info);
 560     } else {
 561
 562         if (!(s = pa_hashmap_get(u->by_origin, info.origin))) {
 563             if (!(s = session_new(u, &info)))
 564                 pa_sdp_info_destroy(&info);
 565
 566         } else {
 567             struct timeval now;
 568             pa_rtclock_get(&now);
 569             pa_atomic_store(&s->timestamp, now.tv_sec);
 570
 571             pa_sdp_info_destroy(&info);
 572         }
 573     }
 574 }
 575
 576 static void check_death_event_cb(pa_mainloop_api *m, pa_time_event *t, const struct timeval *ptv, void *userdata) {
 577     struct session *s, *n;
 578     struct userdata *u = userdata;
 579     struct timeval now;
 580     struct timeval tv;
 581
 582     pa_assert(m);
 583     pa_assert(t);
 584     pa_assert(ptv);
 585     pa_assert(u);
 586
 587     pa_rtclock_get(&now);
 588
 589     pa_log_debug("Checking for dead streams ...");
 590
 591     for (s = u->sessions; s; s = n) {
 592         int k;
 593         n = s->next;
 594
 595         k = pa_atomic_load(&s->timestamp);
 596
 597         if (k + DEATH_TIMEOUT < now.tv_sec)
 598             session_free(s);
 599     }
 600
 601     /* Restart timer */
 602     pa_gettimeofday(&tv);
 603     pa_timeval_add(&tv, DEATH_TIMEOUT*PA_USEC_PER_SEC);
 604     m->time_restart(t, &tv);
 605 }
 606
 607 int pa__init(pa_module*m) {
 608     struct userdata *u;
 609     pa_modargs *ma = NULL;
 610     struct sockaddr_in sa4;
 611     struct sockaddr_in6 sa6;
 612     struct sockaddr *sa;
 613     socklen_t salen;
 614     const char *sap_address;
 615     int fd = -1;
 616     struct timeval tv;
 617
 618     pa_assert(m);
 619
 620     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 621         pa_log("failed to parse module arguments");
 622         goto fail;
 623     }
 624
 625     sap_address = pa_modargs_get_value(ma, "sap_address", DEFAULT_SAP_ADDRESS);
 626
 627     if (inet_pton(AF_INET6, sap_address, &sa6.sin6_addr) > 0) {
 628         sa6.sin6_family = AF_INET6;
 629         sa6.sin6_port = htons(SAP_PORT);
 630         sa = (struct sockaddr*) &sa6;
 631         salen = sizeof(sa6);
 632     } else if (inet_pton(AF_INET, sap_address, &sa4.sin_addr) > 0) {
 633         sa4.sin_family = AF_INET;
 634         sa4.sin_port = htons(SAP_PORT);
 635         sa = (struct sockaddr*) &sa4;
 636         salen = sizeof(sa4);
 637     } else {
 638         pa_log("Invalid SAP address '%s'", sap_address);
 639         goto fail;
 640     }
 641
 642     if ((fd = mcast_socket(sa, salen)) < 0)
 643         goto fail;
 644
 645     u = pa_xnew(struct userdata, 1);
 646     m->userdata = u;
 647     u->module = m;
 648     u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
 649
 650     u->sap_event = m->core->mainloop->io_new(m->core->mainloop, fd, PA_IO_EVENT_INPUT, sap_event_cb, u);
 651     pa_sap_context_init_recv(&u->sap_context, fd);
 652
 653     PA_LLIST_HEAD_INIT(struct session, u->sessions);
 654     u->n_sessions = 0;
 655     u->by_origin = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 656
 657     pa_gettimeofday(&tv);
 658     pa_timeval_add(&tv, DEATH_TIMEOUT * PA_USEC_PER_SEC);
 659     u->check_death_event = m->core->mainloop->time_new(m->core->mainloop, &tv, check_death_event_cb, u);
 660
 661     pa_modargs_free(ma);
 662
 663     return 0;
 664
 665 fail:
 666     if (ma)
 667         pa_modargs_free(ma);
 668
 669     if (fd >= 0)
 670         pa_close(fd);
 671
 672     return -1;
 673 }
 674
 675 void pa__done(pa_module*m) {
 676     struct userdata *u;
 677     struct session *s;
 678
 679     pa_assert(m);
 680
 681     if (!(u = m->userdata))
 682         return;
 683
 684     if (u->sap_event)
 685         m->core->mainloop->io_free(u->sap_event);
 686
 687     if (u->check_death_event)
 688         m->core->mainloop->time_free(u->check_death_event);
 689
 690     pa_sap_context_destroy(&u->sap_context);
 691
 692     if (u->by_origin) {
 693         while ((s = pa_hashmap_get_first(u->by_origin)))
 694             session_free(s);
 695
 696         pa_hashmap_free(u->by_origin, NULL, NULL);
 697     }
 698
 699     pa_xfree(u->sink_name);
 700     pa_xfree(u);
 701 }