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-rw-r--r--src/modules/rtp/sdp.c256
1 files changed, 256 insertions, 0 deletions
diff --git a/src/modules/rtp/sdp.c b/src/modules/rtp/sdp.c
new file mode 100644
index 0000000..6a2e0c9
--- /dev/null
+++ b/src/modules/rtp/sdp.c
@@ -0,0 +1,256 @@
+/***
+ This file is part of PulseAudio.
+
+ Copyright 2006 Lennart Poettering
+
+ PulseAudio 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 2.1 of the License,
+ or (at your option) any later version.
+
+ PulseAudio 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 PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <time.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <string.h>
+
+#include <pulse/xmalloc.h>
+#include <pulse/util.h>
+
+#include <pulsecore/core-util.h>
+#include <pulsecore/log.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/arpa-inet.h>
+
+#include "sdp.h"
+#include "rtp.h"
+
+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], un[64];
+ const char *u, *f;
+
+ pa_assert(src);
+ pa_assert(dst);
+
+#ifdef HAVE_IPV6
+ pa_assert(af == AF_INET || af == AF_INET6);
+#else
+ pa_assert(af == AF_INET);
+#endif
+
+ pa_assert_se(f = pa_rtp_format_to_string(ss->format));
+
+ if (!(u = pa_get_user_name(un, sizeof(un))))
+ u = "-";
+
+ ntp = (uint32_t) time(NULL) + 2208988800U;
+
+ pa_assert_se(inet_ntop(af, src, buf_src, sizeof(buf_src)));
+ pa_assert_se(inet_ntop(af, dst, buf_dst, sizeof(buf_dst)));
+
+ return pa_sprintf_malloc(
+ PA_SDP_HEADER
+ "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);
+}
+
+static pa_sample_spec *parse_sdp_sample_spec(pa_sample_spec *ss, char *c) {
+ unsigned rate, channels;
+ pa_assert(ss);
+ pa_assert(c);
+
+ if (pa_startswith(c, "L16/")) {
+ ss->format = PA_SAMPLE_S16BE;
+ c += 4;
+ } else
+ return NULL;
+
+ if (sscanf(c, "%u/%u", &rate, &channels) == 2) {
+ ss->rate = (uint32_t) rate;
+ ss->channels = (uint8_t) channels;
+ } else if (sscanf(c, "%u", &rate) == 2) {
+ ss->rate = (uint32_t) rate;
+ ss->channels = 1;
+ } else
+ return NULL;
+
+ if (!pa_sample_spec_valid(ss))
+ return NULL;
+
+ return ss;
+}
+
+pa_sdp_info *pa_sdp_parse(const char *t, pa_sdp_info *i, int is_goodbye) {
+ uint16_t port = 0;
+ bool ss_valid = false;
+
+ pa_assert(t);
+ pa_assert(i);
+
+ i->origin = i->session_name = NULL;
+ i->salen = 0;
+ i->payload = 255;
+
+ if (!pa_startswith(t, PA_SDP_HEADER)) {
+ pa_log("Failed to parse SDP data: invalid header.");
+ goto fail;
+ }
+
+ t += sizeof(PA_SDP_HEADER)-1;
+
+ while (*t) {
+ size_t l;
+
+ l = strcspn(t, "\n");
+
+ if (l <= 2) {
+ pa_log("Failed to parse SDP data: line too short: >%s<.", t);
+ goto fail;
+ }
+
+ if (pa_startswith(t, "o="))
+ i->origin = pa_xstrndup(t+2, l-2);
+ else if (pa_startswith(t, "s="))
+ i->session_name = pa_xstrndup(t+2, l-2);
+ else if (pa_startswith(t, "c=IN IP4 ")) {
+ char a[64];
+ size_t k;
+
+ k = l-8 > sizeof(a) ? sizeof(a) : l-8;
+
+ pa_strlcpy(a, t+9, k);
+ a[strcspn(a, "/")] = 0;
+
+ if (inet_pton(AF_INET, a, &((struct sockaddr_in*) &i->sa)->sin_addr) <= 0) {
+ pa_log("Failed to parse SDP data: bad address: >%s<.", a);
+ goto fail;
+ }
+
+ ((struct sockaddr_in*) &i->sa)->sin_family = AF_INET;
+ ((struct sockaddr_in*) &i->sa)->sin_port = 0;
+ i->salen = sizeof(struct sockaddr_in);
+#ifdef HAVE_IPV6
+ } else if (pa_startswith(t, "c=IN IP6 ")) {
+ char a[64];
+ size_t k;
+
+ k = l-8 > sizeof(a) ? sizeof(a) : l-8;
+
+ pa_strlcpy(a, t+9, k);
+ a[strcspn(a, "/")] = 0;
+
+ if (inet_pton(AF_INET6, a, &((struct sockaddr_in6*) &i->sa)->sin6_addr) <= 0) {
+ pa_log("Failed to parse SDP data: bad address: >%s<.", a);
+ goto fail;
+ }
+
+ ((struct sockaddr_in6*) &i->sa)->sin6_family = AF_INET6;
+ ((struct sockaddr_in6*) &i->sa)->sin6_port = 0;
+ i->salen = sizeof(struct sockaddr_in6);
+#endif
+ } else if (pa_startswith(t, "m=audio ")) {
+
+ if (i->payload > 127) {
+ int _port, _payload;
+
+ if (sscanf(t+8, "%i RTP/AVP %i", &_port, &_payload) == 2) {
+
+ if (_port <= 0 || _port > 0xFFFF) {
+ pa_log("Failed to parse SDP data: invalid port %i.", _port);
+ goto fail;
+ }
+
+ if (_payload < 0 || _payload > 127) {
+ pa_log("Failed to parse SDP data: invalid payload %i.", _payload);
+ goto fail;
+ }
+
+ port = (uint16_t) _port;
+ i->payload = (uint8_t) _payload;
+
+ if (pa_rtp_sample_spec_from_payload(i->payload, &i->sample_spec))
+ ss_valid = true;
+ }
+ }
+ } else if (pa_startswith(t, "a=rtpmap:")) {
+
+ if (i->payload <= 127) {
+ char c[64];
+ int _payload;
+ int len;
+
+ if (sscanf(t + 9, "%i %n", &_payload, &len) == 1) {
+ if (_payload < 0 || _payload > 127) {
+ pa_log("Failed to parse SDP data: invalid payload %i.", _payload);
+ goto fail;
+ }
+ if (_payload == i->payload) {
+ strncpy(c, t + 9 + len, 63);
+ c[63] = 0;
+ c[strcspn(c, "\n")] = 0;
+
+ if (parse_sdp_sample_spec(&i->sample_spec, c))
+ ss_valid = true;
+ }
+ }
+ }
+ }
+
+ t += l;
+
+ if (*t == '\n')
+ t++;
+ }
+
+ if (!i->origin || (!is_goodbye && (!i->salen || i->payload > 127 || !ss_valid || port == 0))) {
+ pa_log("Failed to parse SDP data: missing data.");
+ goto fail;
+ }
+
+ if (((struct sockaddr*) &i->sa)->sa_family == AF_INET)
+ ((struct sockaddr_in*) &i->sa)->sin_port = htons(port);
+ else
+ ((struct sockaddr_in6*) &i->sa)->sin6_port = htons(port);
+
+ return i;
+
+fail:
+ pa_xfree(i->origin);
+ pa_xfree(i->session_name);
+
+ return NULL;
+}
+
+void pa_sdp_info_destroy(pa_sdp_info *i) {
+ pa_assert(i);
+
+ pa_xfree(i->origin);
+ pa_xfree(i->session_name);
+}
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