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

   1
   2 /***
   3   This file is part of polypaudio.
   4
   5   polypaudio is free software; you can redistribute it and/or modify
   6   it under the terms of the GNU Lesser General Public License as published
   7   by the Free Software Foundation; either version 2 of the License,
   8   or (at your option) any later version.
   9
  10   polypaudio is distributed in the hope that it will be useful, but
  11   WITHOUT ANY WARRANTY; without even the implied warranty of
  12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13   General Public License for more details.
  14
  15   You should have received a copy of the GNU Lesser General Public License
  16   along with polypaudio; if not, write to the Free Software
  17   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18   USA.
  19 ***/
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include <config.h>
  23 #endif
  24
  25 #include <assert.h>
  26 #include <stdio.h>
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <arpa/inet.h>
  30 #include <errno.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33
  34 #include <polyp/timeval.h>
  35 #include <polyp/xmalloc.h>
  36
  37 #include <polypcore/core-error.h>
  38 #include <polypcore/module.h>
  39 #include <polypcore/llist.h>
  40 #include <polypcore/sink.h>
  41 #include <polypcore/sink-input.h>
  42 #include <polypcore/memblockq.h>
  43 #include <polypcore/log.h>
  44 #include <polypcore/core-util.h>
  45 #include <polypcore/modargs.h>
  46 #include <polypcore/namereg.h>
  47 #include <polypcore/sample-util.h>
  48
  49 #include "module-rtp-recv-symdef.h"
  50
  51 #include "rtp.h"
  52 #include "sdp.h"
  53 #include "sap.h"
  54
  55 PA_MODULE_AUTHOR("Lennart Poettering")
  56 PA_MODULE_DESCRIPTION("Recieve data from a network via RTP/SAP/SDP")
  57 PA_MODULE_VERSION(PACKAGE_VERSION)
  58 PA_MODULE_USAGE(
  59         "sink=<name of the sink> "
  60         "sap_address=<multicast address to listen on> "
  61 )
  62
  63 #define SAP_PORT 9875
  64 #define DEFAULT_SAP_ADDRESS "224.0.0.56"
  65 #define MEMBLOCKQ_MAXLENGTH (1024*170)
  66 #define MAX_SESSIONS 16
  67 #define DEATH_TIMEOUT 20000000
  68
  69 static const char* const valid_modargs[] = {
  70     "sink",
  71     "sap_address",
  72     NULL
  73 };
  74
  75 struct session {
  76     struct userdata *userdata;
  77
  78     pa_sink_input *sink_input;
  79     pa_memblockq *memblockq;
  80
  81     pa_time_event *death_event;
  82
  83     int first_packet;
  84     uint32_t ssrc;
  85     uint32_t offset;
  86
  87     struct pa_sdp_info sdp_info;
  88
  89     pa_rtp_context rtp_context;
  90     pa_io_event* rtp_event;
  91 };
  92
  93 struct userdata {
  94     pa_module *module;
  95     pa_core *core;
  96
  97     pa_sap_context sap_context;
  98     pa_io_event* sap_event;
  99
 100     pa_hashmap *by_origin;
 101
 102     char *sink_name;
 103
 104     int n_sessions;
 105 };
 106
 107 static void session_free(struct session *s, int from_hash);
 108
 109 static int sink_input_peek(pa_sink_input *i, pa_memchunk *chunk) {
 110     struct session *s;
 111     assert(i);
 112     s = i->userdata;
 113
 114     return pa_memblockq_peek(s->memblockq, chunk);
 115 }
 116
 117 static void sink_input_drop(pa_sink_input *i, const pa_memchunk *chunk, size_t length) {
 118     struct session *s;
 119     assert(i);
 120     s = i->userdata;
 121
 122     pa_memblockq_drop(s->memblockq, chunk, length);
 123 }
 124
 125 static void sink_input_kill(pa_sink_input* i) {
 126     struct session *s;
 127     assert(i);
 128     s = i->userdata;
 129
 130     session_free(s, 1);
 131 }
 132
 133 static pa_usec_t sink_input_get_latency(pa_sink_input *i) {
 134     struct session *s;
 135     assert(i);
 136     s = i->userdata;
 137
 138     return pa_bytes_to_usec(pa_memblockq_get_length(s->memblockq), &i->sample_spec);
 139 }
 140
 141 static void rtp_event_cb(pa_mainloop_api *m, pa_io_event *e, int fd, pa_io_event_flags_t flags, void *userdata) {
 142     struct session *s = userdata;
 143     pa_memchunk chunk;
 144     int64_t k, j, delta;
 145     struct timeval tv;
 146
 147     assert(m);
 148     assert(e);
 149     assert(s);
 150     assert(fd == s->rtp_context.fd);
 151     assert(flags == PA_IO_EVENT_INPUT);
 152
 153     if (pa_rtp_recv(&s->rtp_context, &chunk, s->userdata->core->memblock_stat) < 0)
 154         return;
 155
 156     if (s->sdp_info.payload != s->rtp_context.payload) {
 157         pa_memblock_unref(chunk.memblock);
 158         return;
 159     }
 160
 161     if (!s->first_packet) {
 162         s->first_packet = 1;
 163
 164         s->ssrc = s->rtp_context.ssrc;
 165         s->offset = s->rtp_context.timestamp;
 166
 167         if (s->ssrc == s->userdata->core->cookie)
 168             pa_log_warn(__FILE__": WARNING! Detected RTP packet loop!");
 169     } else {
 170         if (s->ssrc != s->rtp_context.ssrc) {
 171             pa_memblock_unref(chunk.memblock);
 172             return;
 173         }
 174     }
 175
 176     /* Check wheter there was a timestamp overflow */
 177     k = (int64_t) s->rtp_context.timestamp - (int64_t) s->offset;
 178     j = (int64_t) 0x100000000LL - (int64_t) s->offset + (int64_t) s->rtp_context.timestamp;
 179
 180     if ((k < 0 ? -k : k) < (j < 0 ? -j : j))
 181         delta = k;
 182     else
 183         delta = j;
 184
 185     pa_memblockq_seek(s->memblockq, delta * s->rtp_context.frame_size, PA_SEEK_RELATIVE);
 186
 187     if (pa_memblockq_push(s->memblockq, &chunk) < 0) {
 188         /* queue overflow, let's flush it and try again */
 189         pa_memblockq_flush(s->memblockq);
 190         pa_memblockq_push(s->memblockq, &chunk);
 191     }
 192
 193     /* The next timestamp we expect */
 194     s->offset = s->rtp_context.timestamp + (chunk.length / s->rtp_context.frame_size);
 195
 196     pa_memblock_unref(chunk.memblock);
 197
 198     /* Reset death timer */
 199     pa_gettimeofday(&tv);
 200     pa_timeval_add(&tv, DEATH_TIMEOUT);
 201     m->time_restart(s->death_event, &tv);
 202 }
 203
 204 static void death_event_cb(pa_mainloop_api *m, pa_time_event *t, const struct timeval *tv, void *userdata) {
 205     struct session *s = userdata;
 206
 207     assert(m);
 208     assert(t);
 209     assert(tv);
 210     assert(s);
 211
 212     session_free(s, 1);
 213 }
 214
 215 static int mcast_socket(const struct sockaddr* sa, socklen_t salen) {
 216     int af, fd = -1, r, one;
 217
 218     af = sa->sa_family;
 219     if ((fd = socket(af, SOCK_DGRAM, 0)) < 0) {
 220         pa_log(__FILE__": Failed to create socket: %s", pa_cstrerror(errno));
 221         goto fail;
 222     }
 223
 224     one = 1;
 225     if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0) {
 226         pa_log(__FILE__": SO_REUSEADDR failed: %s", pa_cstrerror(errno));
 227         goto fail;
 228     }
 229
 230     if (af == AF_INET) {
 231         struct ip_mreq mr4;
 232         memset(&mr4, 0, sizeof(mr4));
 233         mr4.imr_multiaddr = ((const struct sockaddr_in*) sa)->sin_addr;
 234         r = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mr4, sizeof(mr4));
 235     } else {
 236         struct ipv6_mreq mr6;
 237         memset(&mr6, 0, sizeof(mr6));
 238         mr6.ipv6mr_multiaddr = ((const struct sockaddr_in6*) sa)->sin6_addr;
 239         r = setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mr6, sizeof(mr6));
 240     }
 241
 242     if (r < 0) {
 243         pa_log_info(__FILE__": Joining mcast group failed: %s", pa_cstrerror(errno));
 244         goto fail;
 245     }
 246
 247     if (bind(fd, sa, salen) < 0) {
 248         pa_log(__FILE__": bind() failed: %s", pa_cstrerror(errno));
 249         goto fail;
 250     }
 251
 252     return fd;
 253
 254 fail:
 255     if (fd >= 0)
 256         close(fd);
 257
 258     return -1;
 259 }
 260
 261 static struct session *session_new(struct userdata *u, const pa_sdp_info *sdp_info) {
 262     struct session *s = NULL;
 263     struct timeval tv;
 264     char *c;
 265     pa_sink *sink;
 266     int fd = -1;
 267     pa_memblock *silence;
 268
 269     if (u->n_sessions >= MAX_SESSIONS) {
 270         pa_log(__FILE__": session limit reached.");
 271         goto fail;
 272     }
 273
 274     if (!(sink = pa_namereg_get(u->core, u->sink_name, PA_NAMEREG_SINK, 1))) {
 275         pa_log(__FILE__": sink does not exist.");
 276         goto fail;
 277     }
 278
 279     s = pa_xnew0(struct session, 1);
 280     s->userdata = u;
 281     s->first_packet = 0;
 282     s->sdp_info = *sdp_info;
 283
 284     if ((fd = mcast_socket((const struct sockaddr*) &sdp_info->sa, sdp_info->salen)) < 0)
 285         goto fail;
 286
 287     c = pa_sprintf_malloc("RTP Stream%s%s%s",
 288                           sdp_info->session_name ? " (" : "",
 289                           sdp_info->session_name ? sdp_info->session_name : "",
 290                           sdp_info->session_name ? ")" : "");
 291
 292     s->sink_input = pa_sink_input_new(sink, __FILE__, c, &sdp_info->sample_spec, NULL, NULL, 0, PA_RESAMPLER_INVALID);
 293     pa_xfree(c);
 294
 295     if (!s->sink_input) {
 296         pa_log(__FILE__": failed to create sink input.");
 297         goto fail;
 298     }
 299
 300     s->sink_input->userdata = s;
 301     s->sink_input->owner = u->module;
 302
 303     s->sink_input->peek = sink_input_peek;
 304     s->sink_input->drop = sink_input_drop;
 305     s->sink_input->kill = sink_input_kill;
 306     s->sink_input->get_latency = sink_input_get_latency;
 307
 308     silence = pa_silence_memblock_new(&s->sink_input->sample_spec,
 309                                       (pa_bytes_per_second(&s->sink_input->sample_spec)/128/pa_frame_size(&s->sink_input->sample_spec))*
 310                                       pa_frame_size(&s->sink_input->sample_spec),
 311                                       s->userdata->core->memblock_stat);
 312
 313     s->memblockq = pa_memblockq_new(
 314             0,
 315             MEMBLOCKQ_MAXLENGTH,
 316             MEMBLOCKQ_MAXLENGTH,
 317             pa_frame_size(&s->sink_input->sample_spec),
 318             pa_bytes_per_second(&s->sink_input->sample_spec)/10+1,
 319             0,
 320             silence,
 321             u->core->memblock_stat);
 322
 323     pa_memblock_unref(silence);
 324
 325     s->rtp_event = u->core->mainloop->io_new(u->core->mainloop, fd, PA_IO_EVENT_INPUT, rtp_event_cb, s);
 326
 327     pa_gettimeofday(&tv);
 328     pa_timeval_add(&tv, DEATH_TIMEOUT);
 329     s->death_event = u->core->mainloop->time_new(u->core->mainloop, &tv, death_event_cb, s);
 330
 331     pa_hashmap_put(s->userdata->by_origin, s->sdp_info.origin, s);
 332
 333     pa_rtp_context_init_recv(&s->rtp_context, fd, pa_frame_size(&s->sdp_info.sample_spec));
 334
 335     pa_log_info(__FILE__": Found new session '%s'", s->sdp_info.session_name);
 336
 337     u->n_sessions++;
 338
 339     return s;
 340
 341 fail:
 342     if (s) {
 343         if (fd >= 0)
 344             close(fd);
 345
 346         pa_xfree(s);
 347     }
 348
 349     return NULL;
 350 }
 351
 352 static void session_free(struct session *s, int from_hash) {
 353     assert(s);
 354
 355     pa_log_info(__FILE__": Freeing session '%s'", s->sdp_info.session_name);
 356
 357     s->userdata->core->mainloop->time_free(s->death_event);
 358     s->userdata->core->mainloop->io_free(s->rtp_event);
 359
 360     if (from_hash)
 361         pa_hashmap_remove(s->userdata->by_origin, s->sdp_info.origin);
 362
 363     pa_sink_input_disconnect(s->sink_input);
 364     pa_sink_input_unref(s->sink_input);
 365
 366     pa_memblockq_free(s->memblockq);
 367     pa_sdp_info_destroy(&s->sdp_info);
 368     pa_rtp_context_destroy(&s->rtp_context);
 369
 370     assert(s->userdata->n_sessions >= 1);
 371     s->userdata->n_sessions--;
 372
 373     pa_xfree(s);
 374 }
 375
 376 static void sap_event_cb(pa_mainloop_api *m, pa_io_event *e, int fd, pa_io_event_flags_t flags, void *userdata) {
 377     struct userdata *u = userdata;
 378     int goodbye;
 379     pa_sdp_info info;
 380     struct session *s;
 381
 382     assert(m);
 383     assert(e);
 384     assert(u);
 385     assert(fd == u->sap_context.fd);
 386     assert(flags == PA_IO_EVENT_INPUT);
 387
 388     if (pa_sap_recv(&u->sap_context, &goodbye) < 0)
 389         return;
 390
 391     if (!pa_sdp_parse(u->sap_context.sdp_data, &info, goodbye))
 392         return;
 393
 394     if (goodbye) {
 395
 396         if ((s = pa_hashmap_get(u->by_origin, info.origin)))
 397             session_free(s, 1);
 398
 399         pa_sdp_info_destroy(&info);
 400     } else {
 401
 402         if (!(s = pa_hashmap_get(u->by_origin, info.origin))) {
 403             if (!(s = session_new(u, &info)))
 404                 pa_sdp_info_destroy(&info);
 405
 406         } else {
 407             struct timeval tv;
 408
 409             pa_gettimeofday(&tv);
 410             pa_timeval_add(&tv, DEATH_TIMEOUT);
 411             m->time_restart(s->death_event, &tv);
 412
 413             pa_sdp_info_destroy(&info);
 414         }
 415     }
 416 }
 417
 418 int pa__init(pa_core *c, pa_module*m) {
 419     struct userdata *u;
 420     pa_modargs *ma = NULL;
 421     struct sockaddr_in sa4;
 422     struct sockaddr_in6 sa6;
 423     struct sockaddr *sa;
 424     socklen_t salen;
 425     const char *sap_address;
 426     int fd = -1;
 427
 428     assert(c);
 429     assert(m);
 430
 431     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 432         pa_log(__FILE__": failed to parse module arguments");
 433         goto fail;
 434     }
 435
 436     sap_address = pa_modargs_get_value(ma, "sap_address", DEFAULT_SAP_ADDRESS);
 437
 438     if (inet_pton(AF_INET6, sap_address, &sa6.sin6_addr) > 0) {
 439         sa6.sin6_family = AF_INET6;
 440         sa6.sin6_port = htons(SAP_PORT);
 441         sa = (struct sockaddr*) &sa6;
 442         salen = sizeof(sa6);
 443     } else if (inet_pton(AF_INET, sap_address, &sa4.sin_addr) > 0) {
 444         sa4.sin_family = AF_INET;
 445         sa4.sin_port = htons(SAP_PORT);
 446         sa = (struct sockaddr*) &sa4;
 447         salen = sizeof(sa4);
 448     } else {
 449         pa_log(__FILE__": invalid SAP address '%s'", sap_address);
 450         goto fail;
 451     }
 452
 453     if ((fd = mcast_socket(sa, salen)) < 0)
 454         goto fail;
 455
 456     u = pa_xnew(struct userdata, 1);
 457     m->userdata = u;
 458     u->module = m;
 459     u->core = c;
 460     u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));
 461     u->n_sessions = 0;
 462
 463     u->sap_event = c->mainloop->io_new(c->mainloop, fd, PA_IO_EVENT_INPUT, sap_event_cb, u);
 464
 465     u->by_origin = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 466
 467     pa_sap_context_init_recv(&u->sap_context, fd);
 468
 469     pa_modargs_free(ma);
 470
 471     return 0;
 472
 473 fail:
 474     if (ma)
 475         pa_modargs_free(ma);
 476
 477     if (fd >= 0)
 478         close(fd);
 479
 480     return -1;
 481 }
 482
 483 static void free_func(void *p, PA_GCC_UNUSED void *userdata) {
 484     session_free(p, 0);
 485 }
 486
 487 void pa__done(pa_core *c, pa_module*m) {
 488     struct userdata *u;
 489     assert(c);
 490     assert(m);
 491
 492     if (!(u = m->userdata))
 493         return;
 494
 495     c->mainloop->io_free(u->sap_event);
 496     pa_sap_context_destroy(&u->sap_context);
 497
 498     pa_hashmap_free(u->by_origin, free_func, NULL);
 499
 500     pa_xfree(u->sink_name);
 501     pa_xfree(u);
 502 }