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 <stdio.h>
  29 #include <sys/socket.h>
  30 #include <netinet/in.h>
  31 #include <arpa/inet.h>
  32 #include <errno.h>
  33 #include <string.h>
  34 #include <unistd.h>
  35
  36 #include <pulse/timeval.h>
  37 #include <pulse/util.h>
  38 #include <pulse/xmalloc.h>
  39
  40 #include <pulsecore/core-error.h>
  41 #include <pulsecore/module.h>
  42 #include <pulsecore/llist.h>
  43 #include <pulsecore/source.h>
  44 #include <pulsecore/source-output.h>
  45 #include <pulsecore/memblockq.h>
  46 #include <pulsecore/log.h>
  47 #include <pulsecore/core-util.h>
  48 #include <pulsecore/modargs.h>
  49 #include <pulsecore/namereg.h>
  50 #include <pulsecore/sample-util.h>
  51 #include <pulsecore/macro.h>
  52 #include <pulsecore/socket-util.h>
  53
  54 #include "module-rtp-send-symdef.h"
  55
  56 #include "rtp.h"
  57 #include "sdp.h"
  58 #include "sap.h"
  59
  60 PA_MODULE_AUTHOR("Lennart Poettering")
  61 PA_MODULE_DESCRIPTION("Read data from source and send it to the network via RTP/SAP/SDP")
  62 PA_MODULE_VERSION(PACKAGE_VERSION)
  63 PA_MODULE_USAGE(
  64         "source=<name of the source> "
  65         "format=<sample format> "
  66         "channels=<number of channels> "
  67         "rate=<sample rate> "
  68         "destination=<destination IP address> "
  69         "port=<port number> "
  70         "mtu=<maximum transfer unit> "
  71         "loop=<loopback to local host?>"
  72 )
  73
  74 #define DEFAULT_PORT 46000
  75 #define SAP_PORT 9875
  76 #define DEFAULT_DESTINATION "224.0.0.56"
  77 #define MEMBLOCKQ_MAXLENGTH (1024*170)
  78 #define DEFAULT_MTU 1280
  79 #define SAP_INTERVAL 5
  80
  81 static const char* const valid_modargs[] = {
  82     "source",
  83     "format",
  84     "channels",
  85     "rate",
  86     "destination",
  87     "port",
  88     "mtu" ,
  89     "loop",
  90     NULL
  91 };
  92
  93 struct userdata {
  94     pa_module *module;
  95
  96     pa_source_output *source_output;
  97     pa_memblockq *memblockq;
  98
  99     pa_rtp_context rtp_context;
 100     pa_sap_context sap_context;
 101     size_t mtu;
 102
 103     pa_time_event *sap_event;
 104 };
 105
 106 /* Called from I/O thread context */
 107 static int source_output_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 108     struct userdata *u;
 109     pa_assert_se(u = PA_SOURCE_OUTPUT(o)->userdata);
 110
 111     switch (code) {
 112         case PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY:
 113             *((pa_usec_t*) data) = pa_bytes_to_usec(pa_memblockq_get_length(u->memblockq), &u->source_output->sample_spec);
 114
 115             /* Fall through, the default handler will add in the extra
 116              * latency added by the resampler */
 117             break;
 118     }
 119
 120     return pa_source_output_process_msg(o, code, data, offset, chunk);
 121 }
 122
 123 /* Called from I/O thread context */
 124 static void source_output_push(pa_source_output *o, const pa_memchunk *chunk) {
 125     struct userdata *u;
 126     pa_source_output_assert_ref(o);
 127     pa_assert_se(u = o->userdata);
 128
 129     if (pa_memblockq_push(u->memblockq, chunk) < 0) {
 130         pa_log_warn("Failed to push chunk into memblockq.");
 131         return;
 132     }
 133
 134     pa_rtp_send(&u->rtp_context, u->mtu, u->memblockq);
 135 }
 136
 137 /* Called from main context */
 138 static void source_output_kill(pa_source_output* o) {
 139     struct userdata *u;
 140     pa_source_output_assert_ref(o);
 141     pa_assert_se(u = o->userdata);
 142
 143     pa_module_unload_request(u->module);
 144
 145     pa_source_output_unlink(u->source_output);
 146     pa_source_output_unref(u->source_output);
 147     u->source_output = NULL;
 148 }
 149
 150 static void sap_event_cb(pa_mainloop_api *m, pa_time_event *t, const struct timeval *tv, void *userdata) {
 151     struct userdata *u = userdata;
 152     struct timeval next;
 153
 154     pa_assert(m);
 155     pa_assert(t);
 156     pa_assert(tv);
 157     pa_assert(u);
 158
 159     pa_sap_send(&u->sap_context, 0);
 160
 161     pa_gettimeofday(&next);
 162     pa_timeval_add(&next, SAP_INTERVAL * PA_USEC_PER_SEC);
 163     m->time_restart(t, &next);
 164 }
 165
 166 int pa__init(pa_module*m) {
 167     struct userdata *u;
 168     pa_modargs *ma = NULL;
 169     const char *dest;
 170     uint32_t port = DEFAULT_PORT, mtu;
 171     int af, fd = -1, sap_fd = -1;
 172     pa_source *s;
 173     pa_sample_spec ss;
 174     pa_channel_map cm;
 175     struct sockaddr_in sa4, sap_sa4;
 176     struct sockaddr_in6 sa6, sap_sa6;
 177     struct sockaddr_storage sa_dst;
 178     pa_source_output *o = NULL;
 179     uint8_t payload;
 180     char *p;
 181     int r;
 182     socklen_t k;
 183     struct timeval tv;
 184     char hn[128], *n;
 185     int loop = 0;
 186     pa_source_output_new_data data;
 187
 188     pa_assert(m);
 189
 190     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 191         pa_log("Failed to parse module arguments");
 192         goto fail;
 193     }
 194
 195     if (!(s = pa_namereg_get(m->core, pa_modargs_get_value(ma, "source", NULL), PA_NAMEREG_SOURCE, 1))) {
 196         pa_log("Source does not exist.");
 197         goto fail;
 198     }
 199
 200     if (pa_modargs_get_value_boolean(ma, "loop", &loop) < 0) {
 201         pa_log("Failed to parse \"loop\" parameter.");
 202         goto fail;
 203     }
 204
 205     ss = s->sample_spec;
 206     pa_rtp_sample_spec_fixup(&ss);
 207     cm = s->channel_map;
 208     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 209         pa_log("Failed to parse sample specification");
 210         goto fail;
 211     }
 212
 213     if (!pa_rtp_sample_spec_valid(&ss)) {
 214         pa_log("Specified sample type not compatible with RTP");
 215         goto fail;
 216     }
 217
 218     if (ss.channels != cm.channels)
 219         pa_channel_map_init_auto(&cm, ss.channels, PA_CHANNEL_MAP_AIFF);
 220
 221     payload = pa_rtp_payload_from_sample_spec(&ss);
 222
 223     mtu = pa_frame_align(DEFAULT_MTU, &ss);
 224
 225     if (pa_modargs_get_value_u32(ma, "mtu", &mtu) < 0 || mtu < 1 || mtu % pa_frame_size(&ss) != 0) {
 226         pa_log("Invalid MTU.");
 227         goto fail;
 228     }
 229
 230     port = DEFAULT_PORT + ((rand() % 512) << 1);
 231     if (pa_modargs_get_value_u32(ma, "port", &port) < 0 || port < 1 || port > 0xFFFF) {
 232         pa_log("port= expects a numerical argument between 1 and 65535.");
 233         goto fail;
 234     }
 235
 236     if (port & 1)
 237         pa_log_warn("Port number not even as suggested in RFC3550!");
 238
 239     dest = pa_modargs_get_value(ma, "destination", DEFAULT_DESTINATION);
 240
 241     if (inet_pton(AF_INET6, dest, &sa6.sin6_addr) > 0) {
 242         sa6.sin6_family = af = AF_INET6;
 243         sa6.sin6_port = htons(port);
 244         sap_sa6 = sa6;
 245         sap_sa6.sin6_port = htons(SAP_PORT);
 246     } else if (inet_pton(AF_INET, dest, &sa4.sin_addr) > 0) {
 247         sa4.sin_family = af = AF_INET;
 248         sa4.sin_port = htons(port);
 249         sap_sa4 = sa4;
 250         sap_sa4.sin_port = htons(SAP_PORT);
 251     } else {
 252         pa_log("Invalid destination '%s'", dest);
 253         goto fail;
 254     }
 255
 256     if ((fd = socket(af, SOCK_DGRAM, 0)) < 0) {
 257         pa_log("socket() failed: %s", pa_cstrerror(errno));
 258         goto fail;
 259     }
 260
 261     if (connect(fd, af == AF_INET ? (struct sockaddr*) &sa4 : (struct sockaddr*) &sa6, af == AF_INET ? sizeof(sa4) : sizeof(sa6)) < 0) {
 262         pa_log("connect() failed: %s", pa_cstrerror(errno));
 263         goto fail;
 264     }
 265
 266     if ((sap_fd = socket(af, SOCK_DGRAM, 0)) < 0) {
 267         pa_log("socket() failed: %s", pa_cstrerror(errno));
 268         goto fail;
 269     }
 270
 271     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) {
 272         pa_log("connect() failed: %s", pa_cstrerror(errno));
 273         goto fail;
 274     }
 275
 276     if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0 ||
 277         setsockopt(sap_fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) < 0) {
 278         pa_log("IP_MULTICAST_LOOP failed: %s", pa_cstrerror(errno));
 279         goto fail;
 280     }
 281
 282     /* If the socket queue is full, let's drop packets */
 283     pa_make_fd_nonblock(fd);
 284     pa_make_udp_socket_low_delay(fd);
 285     pa_make_fd_cloexec(fd);
 286     pa_make_fd_cloexec(sap_fd);
 287
 288     pa_source_output_new_data_init(&data);
 289     data.name = "RTP Monitor Stream";
 290     data.driver = __FILE__;
 291     data.module = m;
 292     data.source = s;
 293     pa_source_output_new_data_set_sample_spec(&data, &ss);
 294     pa_source_output_new_data_set_channel_map(&data, &cm);
 295
 296     if (!(o = pa_source_output_new(m->core, &data, 0))) {
 297         pa_log("failed to create source output.");
 298         goto fail;
 299     }
 300
 301     o->parent.process_msg = source_output_process_msg;
 302     o->push = source_output_push;
 303     o->kill = source_output_kill;
 304
 305     u = pa_xnew(struct userdata, 1);
 306     m->userdata = u;
 307     o->userdata = u;
 308
 309     u->module = m;
 310     u->source_output = o;
 311
 312     u->memblockq = pa_memblockq_new(
 313             0,
 314             MEMBLOCKQ_MAXLENGTH,
 315             MEMBLOCKQ_MAXLENGTH,
 316             pa_frame_size(&ss),
 317             1,
 318             0,
 319             NULL);
 320
 321     u->mtu = mtu;
 322
 323     k = sizeof(sa_dst);
 324     pa_assert_se((r = getsockname(fd, (struct sockaddr*) &sa_dst, &k)) >= 0);
 325
 326     n = pa_sprintf_malloc("PulseAudio RTP Stream on %s", pa_get_fqdn(hn, sizeof(hn)));
 327
 328     p = pa_sdp_build(af,
 329                      af == AF_INET ? (void*) &((struct sockaddr_in*) &sa_dst)->sin_addr : (void*) &((struct sockaddr_in6*) &sa_dst)->sin6_addr,
 330                      af == AF_INET ? (void*) &sa4.sin_addr : (void*) &sa6.sin6_addr,
 331                      n, port, payload, &ss);
 332
 333     pa_xfree(n);
 334
 335     pa_rtp_context_init_send(&u->rtp_context, fd, m->core->cookie, payload, pa_frame_size(&ss));
 336     pa_sap_context_init_send(&u->sap_context, sap_fd, p);
 337
 338     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);
 339     pa_log_info("SDP-Data:\n%s\nEOF", p);
 340
 341     pa_sap_send(&u->sap_context, 0);
 342
 343     pa_gettimeofday(&tv);
 344     pa_timeval_add(&tv, SAP_INTERVAL * PA_USEC_PER_SEC);
 345     u->sap_event = m->core->mainloop->time_new(m->core->mainloop, &tv, sap_event_cb, u);
 346
 347     pa_source_output_put(u->source_output);
 348
 349     pa_modargs_free(ma);
 350
 351     return 0;
 352
 353 fail:
 354     if (ma)
 355         pa_modargs_free(ma);
 356
 357     if (fd >= 0)
 358         pa_close(fd);
 359
 360     if (sap_fd >= 0)
 361         pa_close(sap_fd);
 362
 363     if (o) {
 364         pa_source_output_unlink(o);
 365         pa_source_output_unref(o);
 366     }
 367
 368     return -1;
 369 }
 370
 371 void pa__done(pa_module*m) {
 372     struct userdata *u;
 373     pa_assert(m);
 374
 375     if (!(u = m->userdata))
 376         return;
 377
 378     if (u->sap_event)
 379         m->core->mainloop->time_free(u->sap_event);
 380
 381     if (u->source_output) {
 382         pa_source_output_unlink(u->source_output);
 383         pa_source_output_unref(u->source_output);
 384     }
 385
 386     pa_rtp_context_destroy(&u->rtp_context);
 387
 388     pa_sap_send(&u->sap_context, 1);
 389     pa_sap_context_destroy(&u->sap_context);
 390
 391     if (u->memblockq)
 392         pa_memblockq_free(u->memblockq);
 393
 394     pa_xfree(u);
 395 }