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

   1 /* $Id */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio 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   polypaudio 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 polypaudio; 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 <polypcore/module.h>
  36 #include <polypcore/llist.h>
  37 #include <polypcore/source.h>
  38 #include <polypcore/source-output.h>
  39 #include <polypcore/memblockq.h>
  40 #include <polypcore/log.h>
  41 #include <polypcore/util.h>
  42 #include <polypcore/xmalloc.h>
  43 #include <polypcore/modargs.h>
  44 #include <polypcore/namereg.h>
  45
  46 #include "module-rtp-monitor-symdef.h"
  47
  48 #include "rtp.h"
  49 #include "sdp.h"
  50 #include "sap.h"
  51
  52 PA_MODULE_AUTHOR("Lennart Poettering")
  53 PA_MODULE_DESCRIPTION("Read data from source and send it to the network via RTP/SAP/SDP")
  54 PA_MODULE_VERSION(PACKAGE_VERSION)
  55 PA_MODULE_USAGE(
  56         "source=<name of the source> "
  57         "format=<sample format> "
  58         "channels=<number of channels> "
  59         "rate=<sample rate> "
  60         "destinaton=<destination IP address> "
  61         "port=<port number> "
  62         "mtu=<maximum transfer unit> "
  63         "loop=<loopback to local host?>"
  64 )
  65
  66 #define DEFAULT_PORT 46000
  67 #define SAP_PORT 9875
  68 #define DEFAULT_DESTINATION "224.0.1.3"
  69 #define MEMBLOCKQ_MAXLENGTH (1024*170)
  70 #define DEFAULT_MTU 1280
  71 #define SAP_INTERVAL 5000000
  72
  73 static const char* const valid_modargs[] = {
  74     "source",
  75     "format",
  76     "channels",
  77     "rate",
  78     "destination",
  79     "port",
  80     "loop",
  81     NULL
  82 };
  83
  84 struct userdata {
  85     pa_module *module;
  86     pa_core *core;
  87
  88     pa_source_output *source_output;
  89     pa_memblockq *memblockq;
  90
  91     pa_rtp_context rtp_context;
  92     pa_sap_context sap_context;
  93     size_t mtu;
  94
  95     pa_time_event *sap_event;
  96 };
  97
  98 static void source_output_push(pa_source_output *o, const pa_memchunk *chunk) {
  99     struct userdata *u;
 100     assert(o);
 101     u = o->userdata;
 102
 103     if (pa_memblockq_push(u->memblockq, chunk) < 0) {
 104         pa_log(__FILE__": Failed to push chunk into memblockq.");
 105         return;
 106     }
 107
 108     pa_rtp_send(&u->rtp_context, u->mtu, u->memblockq);
 109 }
 110
 111 static void source_output_kill(pa_source_output* o) {
 112     struct userdata *u;
 113     assert(o);
 114     u = o->userdata;
 115
 116     pa_module_unload_request(u->module);
 117
 118     pa_source_output_disconnect(u->source_output);
 119     pa_source_output_unref(u->source_output);
 120     u->source_output = NULL;
 121 }
 122
 123 static pa_usec_t source_output_get_latency (pa_source_output *o) {
 124     struct userdata *u;
 125     assert(o);
 126     u = o->userdata;
 127
 128     return pa_bytes_to_usec(pa_memblockq_get_length(u->memblockq), &o->sample_spec);
 129 }
 130
 131 static void sap_event_cb(pa_mainloop_api *m, pa_time_event *t, const struct timeval *tv, void *userdata) {
 132     struct userdata *u = userdata;
 133     struct timeval next;
 134
 135     assert(m);
 136     assert(t);
 137     assert(tv);
 138     assert(u);
 139
 140     pa_sap_send(&u->sap_context, 0);
 141
 142     pa_gettimeofday(&next);
 143     pa_timeval_add(&next, SAP_INTERVAL);
 144     m->time_restart(t, &next);
 145 }
 146
 147 int pa__init(pa_core *c, pa_module*m) {
 148     struct userdata *u;
 149     pa_modargs *ma = NULL;
 150     const char *dest;
 151     uint32_t port = DEFAULT_PORT, mtu;
 152     int af, fd = -1, sap_fd = -1;
 153     pa_source *s;
 154     pa_sample_spec ss;
 155     pa_channel_map cm;
 156     struct sockaddr_in sa4, sap_sa4;
 157     struct sockaddr_in6 sa6, sap_sa6;
 158     struct sockaddr_storage sa_dst;
 159     pa_source_output *o = NULL;
 160     uint8_t payload;
 161     char *p;
 162     int r;
 163     socklen_t k;
 164     struct timeval tv;
 165     char hn[128], *n;
 166     int loop = 0;
 167
 168     assert(c);
 169     assert(m);
 170
 171     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 172         pa_log(__FILE__": failed to parse module arguments");
 173         goto fail;
 174     }
 175
 176     if (!(s = pa_namereg_get(m->core, pa_modargs_get_value(ma, "source", NULL), PA_NAMEREG_SOURCE, 1))) {
 177         pa_log(__FILE__": source does not exist.");
 178         goto fail;
 179     }
 180
 181     if (pa_modargs_get_value_boolean(ma, "loop", &loop) < 0) {
 182         pa_log(__FILE__": failed to parse \"loop\" parameter.");
 183         goto fail;
 184     }
 185
 186     ss = s->sample_spec;
 187     pa_rtp_sample_spec_fixup(&ss);
 188     cm = s->channel_map;
 189     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 190         pa_log(__FILE__": failed to parse sample specification");
 191         goto fail;
 192     }
 193
 194     if (!pa_rtp_sample_spec_valid(&ss)) {
 195         pa_log(__FILE__": specified sample type not compatible with RTP");
 196         goto fail;
 197     }
 198
 199     if (ss.channels != cm.channels)
 200         pa_channel_map_init_auto(&cm, ss.channels);
 201
 202     payload = pa_rtp_payload_from_sample_spec(&ss);
 203
 204     mtu = (DEFAULT_MTU/pa_frame_size(&ss))*pa_frame_size(&ss);
 205
 206     if (pa_modargs_get_value_u32(ma, "mtu", &mtu) < 0 || mtu < 1 || mtu % pa_frame_size(&ss) != 0) {
 207         pa_log(__FILE__": invalid mtu.");
 208         goto fail;
 209     }
 210
 211     port = DEFAULT_PORT + (rand() % 512);
 212     if (pa_modargs_get_value_u32(ma, "port", &port) < 0 || port < 1 || port > 0xFFFF) {
 213         pa_log(__FILE__": port= expects a numerical argument between 1 and 65535.");
 214         goto fail;
 215     }
 216
 217     dest = pa_modargs_get_value(ma, "destination", DEFAULT_DESTINATION);
 218
 219     if (inet_pton(AF_INET6, dest, &sa6.sin6_addr) > 0) {
 220         sa6.sin6_family = af = AF_INET6;
 221         sa6.sin6_port = htons(port);
 222         sap_sa6 = sa6;
 223         sap_sa6.sin6_port = htons(SAP_PORT);
 224     } else if (inet_pton(AF_INET, dest, &sa4.sin_addr) > 0) {
 225         sa4.sin_family = af = AF_INET;
 226         sa4.sin_port = htons(port);
 227         sap_sa4 = sa4;
 228         sap_sa4.sin_port = htons(SAP_PORT);
 229     } else {
 230         pa_log(__FILE__": invalid destination '%s'", dest);
 231         goto fail;
 232     }
 233
 234     if ((fd = socket(af, SOCK_DGRAM, 0)) < 0) {
 235         pa_log(__FILE__": socket() failed: %s", strerror(errno));
 236         goto fail;
 237     }
 238
 239     if (connect(fd, af == AF_INET ? (struct sockaddr*) &sa4 : (struct sockaddr*) &sa6, af == AF_INET ? sizeof(sa4) : sizeof(sa6)) < 0) {
 240         pa_log(__FILE__": connect() failed: %s", strerror(errno));
 241         goto fail;
 242     }
 243
 244     if ((sap_fd = socket(af, SOCK_DGRAM, 0)) < 0) {
 245         pa_log(__FILE__": socket() failed: %s", strerror(errno));
 246         goto fail;
 247     }
 248
 249     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) {
 250         pa_log(__FILE__": connect() failed: %s", strerror(errno));
 251         goto fail;
 252     }
 253
 254     if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0 ||
 255         setsockopt(sap_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0) {
 256         pa_log(__FILE__": IP_MULTICAST_LOOP failed: %s", strerror(errno));
 257         goto fail;
 258     }
 259
 260     if (!(o = pa_source_output_new(s, __FILE__, "RTP Monitor Stream", &ss, &cm, PA_RESAMPLER_INVALID))) {
 261         pa_log(__FILE__": failed to create source output.");
 262         goto fail;
 263     }
 264
 265     o->push = source_output_push;
 266     o->kill = source_output_kill;
 267     o->get_latency = source_output_get_latency;
 268     o->owner = m;
 269
 270     u = pa_xnew(struct userdata, 1);
 271     m->userdata = u;
 272     o->userdata = u;
 273
 274     u->module = m;
 275     u->core = c;
 276     u->source_output = o;
 277
 278     u->memblockq = pa_memblockq_new(
 279             0,
 280             MEMBLOCKQ_MAXLENGTH,
 281             MEMBLOCKQ_MAXLENGTH,
 282             pa_frame_size(&ss),
 283             1,
 284             0,
 285             NULL,
 286             c->memblock_stat);
 287
 288     u->mtu = mtu;
 289
 290     k = sizeof(sa_dst);
 291     r = getsockname(fd, (struct sockaddr*) &sa_dst, &k);
 292     assert(r >= 0);
 293
 294     n = pa_sprintf_malloc("Polypaudio RTP Stream on %s", pa_get_fqdn(hn, sizeof(hn)));
 295
 296     p = pa_sdp_build(af,
 297                      af == AF_INET ? (void*) &((struct sockaddr_in*) &sa_dst)->sin_addr : (void*) &((struct sockaddr_in6*) &sa_dst)->sin6_addr,
 298                      af == AF_INET ? (void*) &sa4.sin_addr : (void*) &sa6.sin6_addr,
 299                      n, port, payload, &ss);
 300
 301     pa_xfree(n);
 302
 303     pa_rtp_context_init_send(&u->rtp_context, fd, c->cookie, payload, pa_frame_size(&ss));
 304     pa_sap_context_init_send(&u->sap_context, sap_fd, p);
 305
 306     pa_log_info(__FILE__": 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);
 307     pa_log_info(__FILE__": SDP-Data:\n%s\n"__FILE__": EOF", p);
 308
 309     pa_sap_send(&u->sap_context, 0);
 310
 311     pa_gettimeofday(&tv);
 312     pa_timeval_add(&tv, SAP_INTERVAL);
 313     u->sap_event = c->mainloop->time_new(c->mainloop, &tv, sap_event_cb, u);
 314
 315     pa_modargs_free(ma);
 316
 317     return 0;
 318
 319 fail:
 320     if (ma)
 321         pa_modargs_free(ma);
 322
 323     if (fd >= 0)
 324         close(fd);
 325
 326     if (sap_fd >= 0)
 327         close(sap_fd);
 328
 329     if (o) {
 330         pa_source_output_disconnect(o);
 331         pa_source_output_unref(o);
 332     }
 333
 334     return -1;
 335 }
 336
 337 void pa__done(pa_core *c, pa_module*m) {
 338     struct userdata *u;
 339     assert(c);
 340     assert(m);
 341
 342     if (!(u = m->userdata))
 343         return;
 344
 345     c->mainloop->time_free(u->sap_event);
 346
 347     if (u->source_output) {
 348         pa_source_output_disconnect(u->source_output);
 349         pa_source_output_unref(u->source_output);
 350     }
 351
 352     pa_rtp_context_destroy(&u->rtp_context);
 353
 354     pa_sap_send(&u->sap_context, 1);
 355     pa_sap_context_destroy(&u->sap_context);
 356
 357     pa_memblockq_free(u->memblockq);
 358
 359     pa_xfree(u);
 360 }