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   Copyright 2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <assert.h>
  29 #include <stdio.h>
  30 #include <sys/socket.h>
  31 #include <netinet/in.h>
  32 #include <arpa/inet.h>
  33 #include <errno.h>
  34 #include <string.h>
  35 #include <unistd.h>
  36
  37 #include <pulse/timeval.h>
  38 #include <pulse/util.h>
  39 #include <pulse/xmalloc.h>
  40
  41 #include <pulsecore/core-error.h>
  42 #include <pulsecore/module.h>
  43 #include <pulsecore/llist.h>
  44 #include <pulsecore/source.h>
  45 #include <pulsecore/source-output.h>
  46 #include <pulsecore/memblockq.h>
  47 #include <pulsecore/log.h>
  48 #include <pulsecore/core-util.h>
  49 #include <pulsecore/modargs.h>
  50 #include <pulsecore/namereg.h>
  51
  52 #include "module-rtp-send-symdef.h"
  53
  54 #include "rtp.h"
  55 #include "sdp.h"
  56 #include "sap.h"
  57
  58 PA_MODULE_AUTHOR("Lennart Poettering")
  59 PA_MODULE_DESCRIPTION("Read data from source and send it to the network via RTP/SAP/SDP")
  60 PA_MODULE_VERSION(PACKAGE_VERSION)
  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=<destination IP address> "
  67         "port=<port number> "
  68         "mtu=<maximum transfer unit> "
  69         "loop=<loopback to local host?>"
  70 )
  71
  72 #define DEFAULT_PORT 46000
  73 #define SAP_PORT 9875
  74 #define DEFAULT_DESTINATION "224.0.0.56"
  75 #define MEMBLOCKQ_MAXLENGTH (1024*170)
  76 #define DEFAULT_MTU 1280
  77 #define SAP_INTERVAL 5000000
  78
  79 static const char* const valid_modargs[] = {
  80     "source",
  81     "format",
  82     "channels",
  83     "rate",
  84     "destination",
  85     "port",
  86     "mtu" ,
  87     "loop",
  88     NULL
  89 };
  90
  91 struct userdata {
  92     pa_module *module;
  93     pa_core *core;
  94
  95     pa_source_output *source_output;
  96     pa_memblockq *memblockq;
  97
  98     pa_rtp_context rtp_context;
  99     pa_sap_context sap_context;
 100     size_t mtu;
 101
 102     pa_time_event *sap_event;
 103 };
 104
 105 static void source_output_push(pa_source_output *o, const pa_memchunk *chunk) {
 106     struct userdata *u;
 107     assert(o);
 108     u = o->userdata;
 109
 110     if (pa_memblockq_push(u->memblockq, chunk) < 0) {
 111         pa_log("Failed to push chunk into memblockq.");
 112         return;
 113     }
 114
 115     pa_rtp_send(&u->rtp_context, u->mtu, u->memblockq);
 116 }
 117
 118 static void source_output_kill(pa_source_output* o) {
 119     struct userdata *u;
 120     assert(o);
 121     u = o->userdata;
 122
 123     pa_module_unload_request(u->module);
 124
 125     pa_source_output_disconnect(u->source_output);
 126     pa_source_output_unref(u->source_output);
 127     u->source_output = NULL;
 128 }
 129
 130 static pa_usec_t source_output_get_latency (pa_source_output *o) {
 131     struct userdata *u;
 132     assert(o);
 133     u = o->userdata;
 134
 135     return pa_bytes_to_usec(pa_memblockq_get_length(u->memblockq), &o->sample_spec);
 136 }
 137
 138 static void sap_event_cb(pa_mainloop_api *m, pa_time_event *t, const struct timeval *tv, void *userdata) {
 139     struct userdata *u = userdata;
 140     struct timeval next;
 141
 142     assert(m);
 143     assert(t);
 144     assert(tv);
 145     assert(u);
 146
 147     pa_sap_send(&u->sap_context, 0);
 148
 149     pa_gettimeofday(&next);
 150     pa_timeval_add(&next, SAP_INTERVAL);
 151     m->time_restart(t, &next);
 152 }
 153
 154 int pa__init(pa_core *c, pa_module*m) {
 155     struct userdata *u;
 156     pa_modargs *ma = NULL;
 157     const char *dest;
 158     uint32_t port = DEFAULT_PORT, mtu;
 159     int af, fd = -1, sap_fd = -1;
 160     pa_source *s;
 161     pa_sample_spec ss;
 162     pa_channel_map cm;
 163     struct sockaddr_in sa4, sap_sa4;
 164     struct sockaddr_in6 sa6, sap_sa6;
 165     struct sockaddr_storage sa_dst;
 166     pa_source_output *o = NULL;
 167     uint8_t payload;
 168     char *p;
 169     int r;
 170     socklen_t k;
 171     struct timeval tv;
 172     char hn[128], *n;
 173     int loop = 0;
 174     pa_source_output_new_data data;
 175
 176     assert(c);
 177     assert(m);
 178
 179     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 180         pa_log("failed to parse module arguments");
 181         goto fail;
 182     }
 183
 184     if (!(s = pa_namereg_get(m->core, pa_modargs_get_value(ma, "source", NULL), PA_NAMEREG_SOURCE, 1))) {
 185         pa_log("source does not exist.");
 186         goto fail;
 187     }
 188
 189     if (pa_modargs_get_value_boolean(ma, "loop", &loop) < 0) {
 190         pa_log("failed to parse \"loop\" parameter.");
 191         goto fail;
 192     }
 193
 194     ss = s->sample_spec;
 195     pa_rtp_sample_spec_fixup(&ss);
 196     cm = s->channel_map;
 197     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 198         pa_log("failed to parse sample specification");
 199         goto fail;
 200     }
 201
 202     if (!pa_rtp_sample_spec_valid(&ss)) {
 203         pa_log("specified sample type not compatible with RTP");
 204         goto fail;
 205     }
 206
 207     if (ss.channels != cm.channels)
 208         pa_channel_map_init_auto(&cm, ss.channels, PA_CHANNEL_MAP_AIFF);
 209
 210     payload = pa_rtp_payload_from_sample_spec(&ss);
 211
 212     mtu = (DEFAULT_MTU/pa_frame_size(&ss))*pa_frame_size(&ss);
 213
 214     if (pa_modargs_get_value_u32(ma, "mtu", &mtu) < 0 || mtu < 1 || mtu % pa_frame_size(&ss) != 0) {
 215         pa_log("invalid mtu.");
 216         goto fail;
 217     }
 218
 219     port = DEFAULT_PORT + ((rand() % 512) << 1);
 220     if (pa_modargs_get_value_u32(ma, "port", &port) < 0 || port < 1 || port > 0xFFFF) {
 221         pa_log("port= expects a numerical argument between 1 and 65535.");
 222         goto fail;
 223     }
 224
 225     if (port & 1)
 226         pa_log_warn("WARNING: port number not even as suggested in RFC3550!");
 227
 228     dest = pa_modargs_get_value(ma, "destination", DEFAULT_DESTINATION);
 229
 230     if (inet_pton(AF_INET6, dest, &sa6.sin6_addr) > 0) {
 231         sa6.sin6_family = af = AF_INET6;
 232         sa6.sin6_port = htons(port);
 233         sap_sa6 = sa6;
 234         sap_sa6.sin6_port = htons(SAP_PORT);
 235     } else if (inet_pton(AF_INET, dest, &sa4.sin_addr) > 0) {
 236         sa4.sin_family = af = AF_INET;
 237         sa4.sin_port = htons(port);
 238         sap_sa4 = sa4;
 239         sap_sa4.sin_port = htons(SAP_PORT);
 240     } else {
 241         pa_log("invalid destination '%s'", dest);
 242         goto fail;
 243     }
 244
 245     if ((fd = socket(af, SOCK_DGRAM, 0)) < 0) {
 246         pa_log("socket() failed: %s", pa_cstrerror(errno));
 247         goto fail;
 248     }
 249
 250     if (connect(fd, af == AF_INET ? (struct sockaddr*) &sa4 : (struct sockaddr*) &sa6, af == AF_INET ? sizeof(sa4) : sizeof(sa6)) < 0) {
 251         pa_log("connect() failed: %s", pa_cstrerror(errno));
 252         goto fail;
 253     }
 254
 255     if ((sap_fd = socket(af, SOCK_DGRAM, 0)) < 0) {
 256         pa_log("socket() failed: %s", pa_cstrerror(errno));
 257         goto fail;
 258     }
 259
 260     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) {
 261         pa_log("connect() failed: %s", pa_cstrerror(errno));
 262         goto fail;
 263     }
 264
 265     if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0 ||
 266         setsockopt(sap_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0) {
 267         pa_log("IP_MULTICAST_LOOP failed: %s", pa_cstrerror(errno));
 268         goto fail;
 269     }
 270
 271     pa_source_output_new_data_init(&data);
 272     data.name = "RTP Monitor Stream";
 273     data.driver = __FILE__;
 274     data.module = m;
 275     data.source = s;
 276     pa_source_output_new_data_set_sample_spec(&data, &ss);
 277     pa_source_output_new_data_set_channel_map(&data, &cm);
 278
 279     if (!(o = pa_source_output_new(c, &data, 0))) {
 280         pa_log("failed to create source output.");
 281         goto fail;
 282     }
 283
 284     o->push = source_output_push;
 285     o->kill = source_output_kill;
 286     o->get_latency = source_output_get_latency;
 287
 288     u = pa_xnew(struct userdata, 1);
 289     m->userdata = u;
 290     o->userdata = u;
 291
 292     u->module = m;
 293     u->core = c;
 294     u->source_output = o;
 295
 296     u->memblockq = pa_memblockq_new(
 297             0,
 298             MEMBLOCKQ_MAXLENGTH,
 299             MEMBLOCKQ_MAXLENGTH,
 300             pa_frame_size(&ss),
 301             1,
 302             0,
 303             NULL);
 304
 305     u->mtu = mtu;
 306
 307     k = sizeof(sa_dst);
 308     r = getsockname(fd, (struct sockaddr*) &sa_dst, &k);
 309     assert(r >= 0);
 310
 311     n = pa_sprintf_malloc("PulseAudio RTP Stream on %s", pa_get_fqdn(hn, sizeof(hn)));
 312
 313     p = pa_sdp_build(af,
 314                      af == AF_INET ? (void*) &((struct sockaddr_in*) &sa_dst)->sin_addr : (void*) &((struct sockaddr_in6*) &sa_dst)->sin6_addr,
 315                      af == AF_INET ? (void*) &sa4.sin_addr : (void*) &sa6.sin6_addr,
 316                      n, port, payload, &ss);
 317
 318     pa_xfree(n);
 319
 320     pa_rtp_context_init_send(&u->rtp_context, fd, c->cookie, payload, pa_frame_size(&ss));
 321     pa_sap_context_init_send(&u->sap_context, sap_fd, p);
 322
 323     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);
 324     pa_log_info("SDP-Data:\n%s\n"__FILE__": EOF", p);
 325
 326     pa_sap_send(&u->sap_context, 0);
 327
 328     pa_gettimeofday(&tv);
 329     pa_timeval_add(&tv, SAP_INTERVAL);
 330     u->sap_event = c->mainloop->time_new(c->mainloop, &tv, sap_event_cb, u);
 331
 332     pa_modargs_free(ma);
 333
 334     return 0;
 335
 336 fail:
 337     if (ma)
 338         pa_modargs_free(ma);
 339
 340     if (fd >= 0)
 341         close(fd);
 342
 343     if (sap_fd >= 0)
 344         close(sap_fd);
 345
 346     if (o) {
 347         pa_source_output_disconnect(o);
 348         pa_source_output_unref(o);
 349     }
 350
 351     return -1;
 352 }
 353
 354 void pa__done(pa_core *c, pa_module*m) {
 355     struct userdata *u;
 356     assert(c);
 357     assert(m);
 358
 359     if (!(u = m->userdata))
 360         return;
 361
 362     c->mainloop->time_free(u->sap_event);
 363
 364     if (u->source_output) {
 365         pa_source_output_disconnect(u->source_output);
 366         pa_source_output_unref(u->source_output);
 367     }
 368
 369     pa_rtp_context_destroy(&u->rtp_context);
 370
 371     pa_sap_send(&u->sap_context, 1);
 372     pa_sap_context_destroy(&u->sap_context);
 373
 374     pa_memblockq_free(u->memblockq);
 375
 376     pa_xfree(u);
 377 }