1 files changed, 87 insertions, 0 deletions
diff --git a/src/modules/rtp/sdp.c b/src/modules/rtp/sdp.c
new file mode 100644
index 00000000..99e8c12b
--- /dev/null
+++ b/src/modules/rtp/sdp.c
@@ -0,0 +1,87 @@
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+ 
+  polypaudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+ 
+  You should have received a copy of the GNU Lesser General Public License
+  along with polypaudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+#include <time.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+#include <polypcore/util.h>
+
+#include "sdp.h"
+
+static const char* map_format(pa_sample_format_t f) {
+    switch (f) {
+        case PA_SAMPLE_S16BE: return "L16";
+        case PA_SAMPLE_U8: return "L8";
+        case PA_SAMPLE_ALAW: return "PCMA";
+        case PA_SAMPLE_ULAW: return "PCMU";
+        default:
+            return NULL;
+    }
+}
+
+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) {
+    uint32_t ntp;
+    char buf_src[64], buf_dst[64];
+    const char *u, *f, *a;
+
+    assert(src);
+    assert(dst);
+    assert(af == AF_INET || af == AF_INET6);
+
+    f = map_format(ss->format);
+    assert(f);
+    
+    if (!(u = getenv("USER")))
+        if (!(u = getenv("USERNAME")))
+            u = "-";
+    
+    ntp = time(NULL) + 2208988800;
+
+    a = inet_ntop(af, src, buf_src, sizeof(buf_src));
+    assert(a);
+    a = inet_ntop(af, dst, buf_dst, sizeof(buf_dst));
+    assert(a);
+    
+    return pa_sprintf_malloc(
+            "v=0\n"
+            "o=%s %lu 0 IN %s %s\n"
+            "s=%s\n"
+            "c=IN %s %s\n"
+            "t=%lu 0\n"
+            "a=recvonly\n"
+            "m=audio %u RTP/AVP %i\n"
+            "a=rtpmap:%i %s/%u/%u\n"
+            "a=type:broadcast\n",
+            u, (unsigned long) ntp, af == AF_INET ? "IP4" : "IP6", buf_src,
+            name,
+            af == AF_INET ? "IP4" : "IP6", buf_dst,
+            (unsigned long) ntp,
+            port, payload,
+            payload, f, ss->rate, ss->channels);
+}