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

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2006 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 <stdio.h>
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <errno.h>
  30 #include <unistd.h>
  31
  32 #include <pulse/rtclock.h>
  33 #include <pulse/timeval.h>
  34 #include <pulse/util.h>
  35 #include <pulse/xmalloc.h>
  36
  37 #include <pulsecore/core-error.h>
  38 #include <pulsecore/module.h>
  39 #include <pulsecore/source.h>
  40 #include <pulsecore/source-output.h>
  41 #include <pulsecore/memblockq.h>
  42 #include <pulsecore/log.h>
  43 #include <pulsecore/core-util.h>
  44 #include <pulsecore/modargs.h>
  45 #include <pulsecore/namereg.h>
  46 #include <pulsecore/sample-util.h>
  47 #include <pulsecore/macro.h>
  48 #include <pulsecore/socket-util.h>
  49 #include <pulsecore/arpa-inet.h>
  50
  51 #include "module-rtp-send-symdef.h"
  52
  53 #include "rtp.h"
  54 #include "sdp.h"
  55 #include "sap.h"
  56
  57 PA_MODULE_AUTHOR("Lennart Poettering");
  58 PA_MODULE_DESCRIPTION("Read data from source and send it to the network via RTP/SAP/SDP");
  59 PA_MODULE_VERSION(PACKAGE_VERSION);
  60 PA_MODULE_LOAD_ONCE(false);
  61 PA_MODULE_USAGE(
  62         "source=<name of the source> "
  63         "format=<sample format> "
  64         "channels=<number of channels> "
  65         "rate=<sample rate> "
  66         "destination_ip=<destination IP address> "
  67         "source_ip=<source IP address> "
  68         "port=<port number> "
  69         "mtu=<maximum transfer unit> "
  70         "loop=<loopback to local host?> "
  71         "ttl=<ttl value>"
  72 );
  73
  74 #define DEFAULT_PORT 46000
  75 #define DEFAULT_TTL 1
  76 #define SAP_PORT 9875
  77 #define DEFAULT_SOURCE_IP "0.0.0.0"
  78 #define DEFAULT_DESTINATION_IP "224.0.0.56"
  79 #define MEMBLOCKQ_MAXLENGTH (1024*170)
  80 #define DEFAULT_MTU 1280
  81 #define SAP_INTERVAL (5*PA_USEC_PER_SEC)
  82
  83 static const char* const valid_modargs[] = {
  84     "source",
  85     "format",
  86     "channels",
  87     "rate",
  88     "destination", /* Compatbility */
  89     "destination_ip",
  90     "source_ip",
  91     "port",
  92     "mtu" ,
  93     "loop",
  94     "ttl",
  95     NULL
  96 };
  97
  98 struct userdata {
  99     pa_module *module;
 100
 101     pa_source_output *source_output;
 102     pa_memblockq *memblockq;
 103
 104     pa_rtp_context rtp_context;
 105     pa_sap_context sap_context;
 106     size_t mtu;
 107
 108     pa_time_event *sap_event;
 109 };
 110
 111 /* Called from I/O thread context */
 112 static int source_output_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 113     struct userdata *u;
 114     pa_assert_se(u = PA_SOURCE_OUTPUT(o)->userdata);
 115
 116     switch (code) {
 117         case PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY:
 118             *((pa_usec_t*) data) = pa_bytes_to_usec(pa_memblockq_get_length(u->memblockq), &u->source_output->sample_spec);
 119
 120             /* Fall through, the default handler will add in the extra
 121              * latency added by the resampler */
 122             break;
 123     }
 124
 125     return pa_source_output_process_msg(o, code, data, offset, chunk);
 126 }
 127
 128 /* Called from I/O thread context */
 129 static void source_output_push(pa_source_output *o, const pa_memchunk *chunk) {
 130     struct userdata *u;
 131     pa_source_output_assert_ref(o);
 132     pa_assert_se(u = o->userdata);
 133
 134     if (pa_memblockq_push(u->memblockq, chunk) < 0) {
 135         pa_log_warn("Failed to push chunk into memblockq.");
 136         return;
 137     }
 138
 139     pa_rtp_send(&u->rtp_context, u->mtu, u->memblockq);
 140 }
 141
 142 /* Called from main context */
 143 static void source_output_kill(pa_source_output* o) {
 144     struct userdata *u;
 145     pa_source_output_assert_ref(o);
 146     pa_assert_se(u = o->userdata);
 147
 148     pa_module_unload_request(u->module, true);
 149
 150     pa_source_output_unlink(u->source_output);
 151     pa_source_output_unref(u->source_output);
 152     u->source_output = NULL;
 153 }
 154
 155 static void sap_event_cb(pa_mainloop_api *m, pa_time_event *t, const struct timeval *tv, void *userdata) {
 156     struct userdata *u = userdata;
 157
 158     pa_assert(m);
 159     pa_assert(t);
 160     pa_assert(u);
 161
 162     pa_sap_send(&u->sap_context, 0);
 163
 164     pa_core_rttime_restart(u->module->core, t, pa_rtclock_now() + SAP_INTERVAL);
 165 }
 166
 167 int pa__init(pa_module*m) {
 168     struct userdata *u;
 169     pa_modargs *ma = NULL;
 170     const char *dst_addr;
 171     const char *src_addr;
 172     uint32_t port = DEFAULT_PORT, mtu;
 173     uint32_t ttl = DEFAULT_TTL;
 174     sa_family_t af;
 175     int fd = -1, sap_fd = -1;
 176     pa_source *s;
 177     pa_sample_spec ss;
 178     pa_channel_map cm;
 179     struct sockaddr_in dst_sa4, dst_sap_sa4, src_sa4, src_sap_sa4;
 180 #ifdef HAVE_IPV6
 181     struct sockaddr_in6 dst_sa6, dst_sap_sa6, src_sa6, src_sap_sa6;
 182 #endif
 183     struct sockaddr_storage sa_dst;
 184     pa_source_output *o = NULL;
 185     uint8_t payload;
 186     char *p;
 187     int r, j;
 188     socklen_t k;
 189     char hn[128], *n;
 190     bool loop = false;
 191     pa_source_output_new_data data;
 192
 193     pa_assert(m);
 194
 195     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 196         pa_log("Failed to parse module arguments");
 197         goto fail;
 198     }
 199
 200     if (!(s = pa_namereg_get(m->core, pa_modargs_get_value(ma, "source", NULL), PA_NAMEREG_SOURCE))) {
 201         pa_log("Source does not exist.");
 202         goto fail;
 203     }
 204
 205     if (pa_modargs_get_value_boolean(ma, "loop", &loop) < 0) {
 206         pa_log("Failed to parse \"loop\" parameter.");
 207         goto fail;
 208     }
 209
 210     ss = s->sample_spec;
 211     pa_rtp_sample_spec_fixup(&ss);
 212     cm = s->channel_map;
 213     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 214         pa_log("Failed to parse sample specification");
 215         goto fail;
 216     }
 217
 218     if (!pa_rtp_sample_spec_valid(&ss)) {
 219         pa_log("Specified sample type not compatible with RTP");
 220         goto fail;
 221     }
 222
 223     if (ss.channels != cm.channels)
 224         pa_channel_map_init_auto(&cm, ss.channels, PA_CHANNEL_MAP_AIFF);
 225
 226     payload = pa_rtp_payload_from_sample_spec(&ss);
 227
 228     mtu = (uint32_t) pa_frame_align(DEFAULT_MTU, &ss);
 229
 230     if (pa_modargs_get_value_u32(ma, "mtu", &mtu) < 0 || mtu < 1 || mtu % pa_frame_size(&ss) != 0) {
 231         pa_log("Invalid MTU.");
 232         goto fail;
 233     }
 234
 235     port = DEFAULT_PORT + ((uint32_t) (rand() % 512) << 1);
 236     if (pa_modargs_get_value_u32(ma, "port", &port) < 0 || port < 1 || port > 0xFFFF) {
 237         pa_log("port= expects a numerical argument between 1 and 65535.");
 238         goto fail;
 239     }
 240
 241     if (port & 1)
 242         pa_log_warn("Port number not even as suggested in RFC3550!");
 243
 244     if (pa_modargs_get_value_u32(ma, "ttl", &ttl) < 0 || ttl < 1 || ttl > 0xFF) {
 245         pa_log("ttl= expects a numerical argument between 1 and 255.");
 246         goto fail;
 247     }
 248
 249     src_addr = pa_modargs_get_value(ma, "source_ip", DEFAULT_SOURCE_IP);
 250
 251     if (inet_pton(AF_INET, src_addr, &src_sa4.sin_addr) > 0) {
 252         src_sa4.sin_family = af = AF_INET;
 253         src_sa4.sin_port = htons(0);
 254         memset(&src_sa4.sin_zero, 0, sizeof(src_sa4.sin_zero));
 255         src_sap_sa4 = src_sa4;
 256 #ifdef HAVE_IPV6
 257     } else if (inet_pton(AF_INET6, src_addr, &src_sa6.sin6_addr) > 0) {
 258         src_sa6.sin6_family = af = AF_INET6;
 259         src_sa6.sin6_port = htons(0);
 260         src_sa6.sin6_flowinfo = 0;
 261         src_sa6.sin6_scope_id = 0;
 262         src_sap_sa6 = src_sa6;
 263 #endif
 264     } else {
 265         pa_log("Invalid source address '%s'", src_addr);
 266         goto fail;
 267     }
 268
 269     dst_addr = pa_modargs_get_value(ma, "destination", NULL);
 270     if (dst_addr == NULL)
 271         dst_addr = pa_modargs_get_value(ma, "destination_ip", DEFAULT_DESTINATION_IP);
 272
 273     if (inet_pton(AF_INET, dst_addr, &dst_sa4.sin_addr) > 0) {
 274         dst_sa4.sin_family = af = AF_INET;
 275         dst_sa4.sin_port = htons((uint16_t) port);
 276         memset(&dst_sa4.sin_zero, 0, sizeof(dst_sa4.sin_zero));
 277         dst_sap_sa4 = dst_sa4;
 278         dst_sap_sa4.sin_port = htons(SAP_PORT);
 279 #ifdef HAVE_IPV6
 280     } else if (inet_pton(AF_INET6, dst_addr, &dst_sa6.sin6_addr) > 0) {
 281         dst_sa6.sin6_family = af = AF_INET6;
 282         dst_sa6.sin6_port = htons((uint16_t) port);
 283         dst_sa6.sin6_flowinfo = 0;
 284         src_sa6.sin6_scope_id = 0;
 285         dst_sap_sa6 = dst_sa6;
 286         dst_sap_sa6.sin6_port = htons(SAP_PORT);
 287 #endif
 288     } else {
 289         pa_log("Invalid destination '%s'", dst_addr);
 290         goto fail;
 291     }
 292
 293     if ((fd = pa_socket_cloexec(af, SOCK_DGRAM, 0)) < 0) {
 294         pa_log("socket() failed: %s", pa_cstrerror(errno));
 295         goto fail;
 296     }
 297
 298     if (af == AF_INET && bind(fd, (struct sockaddr*) &src_sa4, sizeof(src_sa4)) < 0) {
 299         pa_log("bind() failed: %s", pa_cstrerror(errno));
 300         goto fail;
 301 #ifdef HAVE_IPV6
 302     } else if (af == AF_INET6 && bind(fd, (struct sockaddr*) &src_sa6, sizeof(src_sa6)) < 0) {
 303         pa_log("bind() failed: %s", pa_cstrerror(errno));
 304         goto fail;
 305 #endif
 306     }
 307
 308     if (af == AF_INET && connect(fd, (struct sockaddr*) &dst_sa4, sizeof(dst_sa4)) < 0) {
 309         pa_log("connect() failed: %s", pa_cstrerror(errno));
 310         goto fail;
 311 #ifdef HAVE_IPV6
 312     } else if (af == AF_INET6 && connect(fd, (struct sockaddr*) &dst_sa6, sizeof(dst_sa6)) < 0) {
 313         pa_log("connect() failed: %s", pa_cstrerror(errno));
 314         goto fail;
 315 #endif
 316     }
 317
 318     if ((sap_fd = pa_socket_cloexec(af, SOCK_DGRAM, 0)) < 0) {
 319         pa_log("socket() failed: %s", pa_cstrerror(errno));
 320         goto fail;
 321     }
 322
 323     if (af == AF_INET && bind(sap_fd, (struct sockaddr*) &src_sap_sa4, sizeof(src_sap_sa4)) < 0) {
 324         pa_log("bind() failed: %s", pa_cstrerror(errno));
 325         goto fail;
 326 #ifdef HAVE_IPV6
 327     } else if (af == AF_INET6 && bind(sap_fd, (struct sockaddr*) &src_sap_sa6, sizeof(src_sap_sa6)) < 0) {
 328         pa_log("bind() failed: %s", pa_cstrerror(errno));
 329         goto fail;
 330 #endif
 331     }
 332
 333     if (af == AF_INET && connect(sap_fd, (struct sockaddr*) &dst_sap_sa4, sizeof(dst_sap_sa4)) < 0) {
 334         pa_log("connect() failed: %s", pa_cstrerror(errno));
 335         goto fail;
 336 #ifdef HAVE_IPV6
 337     } else if (af == AF_INET6 && connect(sap_fd, (struct sockaddr*) &dst_sap_sa6, sizeof(dst_sap_sa6)) < 0) {
 338         pa_log("connect() failed: %s", pa_cstrerror(errno));
 339         goto fail;
 340 #endif
 341     }
 342
 343     j = !!loop;
 344     if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &j, sizeof(j)) < 0 ||
 345         setsockopt(sap_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &j, sizeof(j)) < 0) {
 346         pa_log("IP_MULTICAST_LOOP failed: %s", pa_cstrerror(errno));
 347         goto fail;
 348     }
 349
 350     if (ttl != DEFAULT_TTL) {
 351         int _ttl = (int) ttl;
 352
 353         if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &_ttl, sizeof(_ttl)) < 0) {
 354             pa_log("IP_MULTICAST_TTL failed: %s", pa_cstrerror(errno));
 355             goto fail;
 356         }
 357
 358         if (setsockopt(sap_fd, IPPROTO_IP, IP_MULTICAST_TTL, &_ttl, sizeof(_ttl)) < 0) {
 359             pa_log("IP_MULTICAST_TTL (sap) failed: %s", pa_cstrerror(errno));
 360             goto fail;
 361         }
 362     }
 363
 364     /* If the socket queue is full, let's drop packets */
 365     pa_make_fd_nonblock(fd);
 366     pa_make_udp_socket_low_delay(fd);
 367
 368     pa_source_output_new_data_init(&data);
 369     pa_proplist_sets(data.proplist, PA_PROP_MEDIA_NAME, "RTP Monitor Stream");
 370     pa_proplist_sets(data.proplist, "rtp.source", src_addr);
 371     pa_proplist_sets(data.proplist, "rtp.destination", dst_addr);
 372     pa_proplist_setf(data.proplist, "rtp.mtu", "%lu", (unsigned long) mtu);
 373     pa_proplist_setf(data.proplist, "rtp.port", "%lu", (unsigned long) port);
 374     pa_proplist_setf(data.proplist, "rtp.ttl", "%lu", (unsigned long) ttl);
 375     data.driver = __FILE__;
 376     data.module = m;
 377     pa_source_output_new_data_set_source(&data, s, false);
 378     pa_source_output_new_data_set_sample_spec(&data, &ss);
 379     pa_source_output_new_data_set_channel_map(&data, &cm);
 380
 381     pa_source_output_new(&o, m->core, &data);
 382     pa_source_output_new_data_done(&data);
 383
 384     if (!o) {
 385         pa_log("failed to create source output.");
 386         goto fail;
 387     }
 388
 389     o->parent.process_msg = source_output_process_msg;
 390     o->push = source_output_push;
 391     o->kill = source_output_kill;
 392
 393     pa_log_info("Configured source latency of %llu ms.",
 394                 (unsigned long long) pa_source_output_set_requested_latency(o, pa_bytes_to_usec(mtu, &o->sample_spec)) / PA_USEC_PER_MSEC);
 395
 396     m->userdata = o->userdata = u = pa_xnew(struct userdata, 1);
 397     u->module = m;
 398     u->source_output = o;
 399
 400     u->memblockq = pa_memblockq_new(
 401             "module-rtp-send memblockq",
 402             0,
 403             MEMBLOCKQ_MAXLENGTH,
 404             MEMBLOCKQ_MAXLENGTH,
 405             &ss,
 406             1,
 407             0,
 408             0,
 409             NULL);
 410
 411     u->mtu = mtu;
 412
 413     k = sizeof(sa_dst);
 414     pa_assert_se((r = getsockname(fd, (struct sockaddr*) &sa_dst, &k)) >= 0);
 415
 416     n = pa_sprintf_malloc("PulseAudio RTP Stream on %s", pa_get_fqdn(hn, sizeof(hn)));
 417
 418     if (af == AF_INET) {
 419         p = pa_sdp_build(af,
 420                      (void*) &((struct sockaddr_in*) &sa_dst)->sin_addr,
 421                      (void*) &dst_sa4.sin_addr,
 422                      n, (uint16_t) port, payload, &ss);
 423 #ifdef HAVE_IPV6
 424     } else {
 425         p = pa_sdp_build(af,
 426                      (void*) &((struct sockaddr_in6*) &sa_dst)->sin6_addr,
 427                      (void*) &dst_sa6.sin6_addr,
 428                      n, (uint16_t) port, payload, &ss);
 429 #endif
 430     }
 431
 432     pa_xfree(n);
 433
 434     pa_rtp_context_init_send(&u->rtp_context, fd, m->core->cookie, payload, pa_frame_size(&ss));
 435     pa_sap_context_init_send(&u->sap_context, sap_fd, p);
 436
 437     pa_log_info("RTP stream initialized with mtu %u on %s:%u from %s ttl=%u, SSRC=0x%08x, payload=%u, initial sequence #%u", mtu, dst_addr, port, src_addr, ttl, u->rtp_context.ssrc, payload, u->rtp_context.sequence);
 438     pa_log_info("SDP-Data:\n%s\nEOF", p);
 439
 440     pa_sap_send(&u->sap_context, 0);
 441
 442     u->sap_event = pa_core_rttime_new(m->core, pa_rtclock_now() + SAP_INTERVAL, sap_event_cb, u);
 443
 444     pa_source_output_put(u->source_output);
 445
 446     pa_modargs_free(ma);
 447
 448     return 0;
 449
 450 fail:
 451     if (ma)
 452         pa_modargs_free(ma);
 453
 454     if (fd >= 0)
 455         pa_close(fd);
 456
 457     if (sap_fd >= 0)
 458         pa_close(sap_fd);
 459
 460     if (o) {
 461         pa_source_output_unlink(o);
 462         pa_source_output_unref(o);
 463     }
 464
 465     return -1;
 466 }
 467
 468 void pa__done(pa_module*m) {
 469     struct userdata *u;
 470     pa_assert(m);
 471
 472     if (!(u = m->userdata))
 473         return;
 474
 475     if (u->sap_event)
 476         m->core->mainloop->time_free(u->sap_event);
 477
 478     if (u->source_output) {
 479         pa_source_output_unlink(u->source_output);
 480         pa_source_output_unref(u->source_output);
 481     }
 482
 483     pa_rtp_context_destroy(&u->rtp_context);
 484
 485     pa_sap_send(&u->sap_context, 1);
 486     pa_sap_context_destroy(&u->sap_context);
 487
 488     if (u->memblockq)
 489         pa_memblockq_free(u->memblockq);
 490
 491     pa_xfree(u);
 492 }