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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   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 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 <assert.h>
  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
  35 #include <pulse/timeval.h>
  36 #include <pulse/util.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/source.h>
  43 #include <pulsecore/source-output.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
  50 #include "module-rtp-send-symdef.h"
  51
  52 #include "rtp.h"
  53 #include "sdp.h"
  54 #include "sap.h"
  55
  56 PA_MODULE_AUTHOR("Lennart Poettering")
  57 PA_MODULE_DESCRIPTION("Read data from source and send it to the network via RTP/SAP/SDP")
  58 PA_MODULE_VERSION(PACKAGE_VERSION)
  59 PA_MODULE_USAGE(
  60         "source=<name of the source> "
  61         "format=<sample format> "
  62         "channels=<number of channels> "
  63         "rate=<sample rate> "
  64         "destination=<destination IP address> "
  65         "port=<port number> "
  66         "mtu=<maximum transfer unit> "
  67         "loop=<loopback to local host?>"
  68 )
  69
  70 #define DEFAULT_PORT 46000
  71 #define SAP_PORT 9875
  72 #define DEFAULT_DESTINATION "224.0.0.56"
  73 #define MEMBLOCKQ_MAXLENGTH (1024*170)
  74 #define DEFAULT_MTU 1280
  75 #define SAP_INTERVAL 5000000
  76
  77 static const char* const valid_modargs[] = {
  78     "source",
  79     "format",
  80     "channels",
  81     "rate",
  82     "destination",
  83     "port",
  84     "loop",
  85     NULL
  86 };
  87
  88 struct userdata {
  89     pa_module *module;
  90     pa_core *core;
  91
  92     pa_source_output *source_output;
  93     pa_memblockq *memblockq;
  94
  95     pa_rtp_context rtp_context;
  96     pa_sap_context sap_context;
  97     size_t mtu;
  98
  99     pa_time_event *sap_event;
 100 };
 101
 102 static void source_output_push(pa_source_output *o, const pa_memchunk *chunk) {
 103     struct userdata *u;
 104     assert(o);
 105     u = o->userdata;
 106
 107     if (pa_memblockq_push(u->memblockq, chunk) < 0) {
 108         pa_log("Failed to push chunk into memblockq.");
 109         return;
 110     }
 111
 112     pa_rtp_send(&u->rtp_context, u->mtu, u->memblockq);
 113 }
 114
 115 static void source_output_kill(pa_source_output* o) {
 116     struct userdata *u;
 117     assert(o);
 118     u = o->userdata;
 119
 120     pa_module_unload_request(u->module);
 121
 122     pa_source_output_disconnect(u->source_output);
 123     pa_source_output_unref(u->source_output);
 124     u->source_output = NULL;
 125 }
 126
 127 static pa_usec_t source_output_get_latency (pa_source_output *o) {
 128     struct userdata *u;
 129     assert(o);
 130     u = o->userdata;
 131
 132     return pa_bytes_to_usec(pa_memblockq_get_length(u->memblockq), &o->sample_spec);
 133 }
 134
 135 static void sap_event_cb(pa_mainloop_api *m, pa_time_event *t, const struct timeval *tv, void *userdata) {
 136     struct userdata *u = userdata;
 137     struct timeval next;
 138
 139     assert(m);
 140     assert(t);
 141     assert(tv);
 142     assert(u);
 143
 144     pa_sap_send(&u->sap_context, 0);
 145
 146     pa_gettimeofday(&next);
 147     pa_timeval_add(&next, SAP_INTERVAL);
 148     m->time_restart(t, &next);
 149 }
 150
 151 int pa__init(pa_core *c, pa_module*m) {
 152     struct userdata *u;
 153     pa_modargs *ma = NULL;
 154     const char *dest;
 155     uint32_t port = DEFAULT_PORT, mtu;
 156     int af, fd = -1, sap_fd = -1;
 157     pa_source *s;
 158     pa_sample_spec ss;
 159     pa_channel_map cm;
 160     struct sockaddr_in sa4, sap_sa4;
 161     struct sockaddr_in6 sa6, sap_sa6;
 162     struct sockaddr_storage sa_dst;
 163     pa_source_output *o = NULL;
 164     uint8_t payload;
 165     char *p;
 166     int r;
 167     socklen_t k;
 168     struct timeval tv;
 169     char hn[128], *n;
 170     int loop = 0;
 171     pa_source_output_new_data data;
 172
 173     assert(c);
 174     assert(m);
 175
 176     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 177         pa_log("failed to parse module arguments");
 178         goto fail;
 179     }
 180
 181     if (!(s = pa_namereg_get(m->core, pa_modargs_get_value(ma, "source", NULL), PA_NAMEREG_SOURCE, 1))) {
 182         pa_log("source does not exist.");
 183         goto fail;
 184     }
 185
 186     if (pa_modargs_get_value_boolean(ma, "loop", &loop) < 0) {
 187         pa_log("failed to parse \"loop\" parameter.");
 188         goto fail;
 189     }
 190
 191     ss = s->sample_spec;
 192     pa_rtp_sample_spec_fixup(&ss);
 193     cm = s->channel_map;
 194     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 195         pa_log("failed to parse sample specification");
 196         goto fail;
 197     }
 198
 199     if (!pa_rtp_sample_spec_valid(&ss)) {
 200         pa_log("specified sample type not compatible with RTP");
 201         goto fail;
 202     }
 203
 204     if (ss.channels != cm.channels)
 205         pa_channel_map_init_auto(&cm, ss.channels, PA_CHANNEL_MAP_AIFF);
 206
 207     payload = pa_rtp_payload_from_sample_spec(&ss);
 208
 209     mtu = (DEFAULT_MTU/pa_frame_size(&ss))*pa_frame_size(&ss);
 210
 211     if (pa_modargs_get_value_u32(ma, "mtu", &mtu) < 0 || mtu < 1 || mtu % pa_frame_size(&ss) != 0) {
 212         pa_log("invalid mtu.");
 213         goto fail;
 214     }
 215
 216     port = DEFAULT_PORT + ((rand() % 512) << 1);
 217     if (pa_modargs_get_value_u32(ma, "port", &port) < 0 || port < 1 || port > 0xFFFF) {
 218         pa_log("port= expects a numerical argument between 1 and 65535.");
 219         goto fail;
 220     }
 221
 222     if (port & 1)
 223         pa_log_warn("WARNING: port number not even as suggested in RFC3550!");
 224
 225     dest = pa_modargs_get_value(ma, "destination", DEFAULT_DESTINATION);
 226
 227     if (inet_pton(AF_INET6, dest, &sa6.sin6_addr) > 0) {
 228         sa6.sin6_family = af = AF_INET6;
 229         sa6.sin6_port = htons(port);
 230         sap_sa6 = sa6;
 231         sap_sa6.sin6_port = htons(SAP_PORT);
 232     } else if (inet_pton(AF_INET, dest, &sa4.sin_addr) > 0) {
 233         sa4.sin_family = af = AF_INET;
 234         sa4.sin_port = htons(port);
 235         sap_sa4 = sa4;
 236         sap_sa4.sin_port = htons(SAP_PORT);
 237     } else {
 238         pa_log("invalid destination '%s'", dest);
 239         goto fail;
 240     }
 241
 242     if ((fd = socket(af, SOCK_DGRAM, 0)) < 0) {
 243         pa_log("socket() failed: %s", pa_cstrerror(errno));
 244         goto fail;
 245     }
 246
 247     if (connect(fd, af == AF_INET ? (struct sockaddr*) &sa4 : (struct sockaddr*) &sa6, af == AF_INET ? sizeof(sa4) : sizeof(sa6)) < 0) {
 248         pa_log("connect() failed: %s", pa_cstrerror(errno));
 249         goto fail;
 250     }
 251
 252     if ((sap_fd = socket(af, SOCK_DGRAM, 0)) < 0) {
 253         pa_log("socket() failed: %s", pa_cstrerror(errno));
 254         goto fail;
 255     }
 256
 257     if (connect(sap_fd, af == AF_INET ? (struct sockaddr*) &sap_sa4 : (struct sockaddr*) &sap_sa6, af == AF_INET ? sizeof(sap_sa4) : sizeof(sap_sa6)) < 0) {
 258         pa_log("connect() failed: %s", pa_cstrerror(errno));
 259         goto fail;
 260     }
 261
 262     if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0 ||
 263         setsockopt(sap_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0) {
 264         pa_log("IP_MULTICAST_LOOP failed: %s", pa_cstrerror(errno));
 265         goto fail;
 266     }
 267
 268     pa_source_output_new_data_init(&data);
 269     data.name = "RTP Monitor Stream";
 270     data.driver = __FILE__;
 271     data.module = m;
 272     data.source = s;
 273     pa_source_output_new_data_set_sample_spec(&data, &ss);
 274     pa_source_output_new_data_set_channel_map(&data, &cm);
 275
 276     if (!(o = pa_source_output_new(c, &data, 0))) {
 277         pa_log("failed to create source output.");
 278         goto fail;
 279     }
 280
 281     o->push = source_output_push;
 282     o->kill = source_output_kill;
 283     o->get_latency = source_output_get_latency;
 284
 285     u = pa_xnew(struct userdata, 1);
 286     m->userdata = u;
 287     o->userdata = u;
 288
 289     u->module = m;
 290     u->core = c;
 291     u->source_output = o;
 292
 293     u->memblockq = pa_memblockq_new(
 294             0,
 295             MEMBLOCKQ_MAXLENGTH,
 296             MEMBLOCKQ_MAXLENGTH,
 297             pa_frame_size(&ss),
 298             1,
 299             0,
 300             NULL);
 301
 302     u->mtu = mtu;
 303
 304     k = sizeof(sa_dst);
 305     r = getsockname(fd, (struct sockaddr*) &sa_dst, &k);
 306     assert(r >= 0);
 307
 308     n = pa_sprintf_malloc("PulseAudio RTP Stream on %s", pa_get_fqdn(hn, sizeof(hn)));
 309
 310     p = pa_sdp_build(af,
 311                      af == AF_INET ? (void*) &((struct sockaddr_in*) &sa_dst)->sin_addr : (void*) &((struct sockaddr_in6*) &sa_dst)->sin6_addr,
 312                      af == AF_INET ? (void*) &sa4.sin_addr : (void*) &sa6.sin6_addr,
 313                      n, port, payload, &ss);
 314
 315     pa_xfree(n);
 316
 317     pa_rtp_context_init_send(&u->rtp_context, fd, c->cookie, payload, pa_frame_size(&ss));
 318     pa_sap_context_init_send(&u->sap_context, sap_fd, p);
 319
 320     pa_log_info("RTP stream initialized with mtu %u on %s:%u, SSRC=0x%08x, payload=%u, initial sequence #%u", mtu, dest, port, u->rtp_context.ssrc, payload, u->rtp_context.sequence);
 321     pa_log_info("SDP-Data:\n%s\n"__FILE__": EOF", p);
 322
 323     pa_sap_send(&u->sap_context, 0);
 324
 325     pa_gettimeofday(&tv);
 326     pa_timeval_add(&tv, SAP_INTERVAL);
 327     u->sap_event = c->mainloop->time_new(c->mainloop, &tv, sap_event_cb, u);
 328
 329     pa_modargs_free(ma);
 330
 331     return 0;
 332
 333 fail:
 334     if (ma)
 335         pa_modargs_free(ma);
 336
 337     if (fd >= 0)
 338         close(fd);
 339
 340     if (sap_fd >= 0)
 341         close(sap_fd);
 342
 343     if (o) {
 344         pa_source_output_disconnect(o);
 345         pa_source_output_unref(o);
 346     }
 347
 348     return -1;
 349 }
 350
 351 void pa__done(pa_core *c, pa_module*m) {
 352     struct userdata *u;
 353     assert(c);
 354     assert(m);
 355
 356     if (!(u = m->userdata))
 357         return;
 358
 359     c->mainloop->time_free(u->sap_event);
 360
 361     if (u->source_output) {
 362         pa_source_output_disconnect(u->source_output);
 363         pa_source_output_unref(u->source_output);
 364     }
 365
 366     pa_rtp_context_destroy(&u->rtp_context);
 367
 368     pa_sap_send(&u->sap_context, 1);
 369     pa_sap_context_destroy(&u->sap_context);
 370
 371     pa_memblockq_free(u->memblockq);
 372
 373     pa_xfree(u);
 374 }