code.delx.au - pulseaudio/blob - src/modules/rtp/sdp.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 <time.h>
  28 #include <stdlib.h>
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <arpa/inet.h>
  32
  33 #include <polypcore/util.h>
  34
  35 #include "sdp.h"
  36
  37 static const char* map_format(pa_sample_format_t f) {
  38     switch (f) {
  39         case PA_SAMPLE_S16BE: return "L16";
  40         case PA_SAMPLE_U8: return "L8";
  41         case PA_SAMPLE_ALAW: return "PCMA";
  42         case PA_SAMPLE_ULAW: return "PCMU";
  43         default:
  44             return NULL;
  45     }
  46 }
  47
  48 char *pa_sdp_build(int af, const void *src, const void *dst, const char *name, uint16_t port, uint8_t payload, const pa_sample_spec *ss) {
  49     uint32_t ntp;
  50     char buf_src[64], buf_dst[64];
  51     const char *u, *f, *a;
  52
  53     assert(src);
  54     assert(dst);
  55     assert(af == AF_INET || af == AF_INET6);
  56
  57     f = map_format(ss->format);
  58     assert(f);
  59
  60     if (!(u = getenv("USER")))
  61         if (!(u = getenv("USERNAME")))
  62             u = "-";
  63
  64     ntp = time(NULL) + 2208988800;
  65
  66     a = inet_ntop(af, src, buf_src, sizeof(buf_src));
  67     assert(a);
  68     a = inet_ntop(af, dst, buf_dst, sizeof(buf_dst));
  69     assert(a);
  70
  71     return pa_sprintf_malloc(
  72             "v=0\n"
  73             "o=%s %lu 0 IN %s %s\n"
  74             "s=%s\n"
  75             "c=IN %s %s\n"
  76             "t=%lu 0\n"
  77             "a=recvonly\n"
  78             "m=audio %u RTP/AVP %i\n"
  79             "a=rtpmap:%i %s/%u/%u\n"
  80             "a=type:broadcast\n",
  81             u, (unsigned long) ntp, af == AF_INET ? "IP4" : "IP6", buf_src,
  82             name,
  83             af == AF_INET ? "IP4" : "IP6", buf_dst,
  84             (unsigned long) ntp,
  85             port, payload,
  86             payload, f, ss->rate, ss->channels);
  87 }