really create glitch-free branch

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/glitch-free@2120 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 261 insertions, 0 deletions

diff --git a/src/modules/rtp/sdp.c b/src/modules/rtp/sdp.c
new file mode 100644
index 00000000..50ac157a
--- /dev/null
+++ b/src/modules/rtp/sdp.c
@@ -0,0 +1,261 @@
+/* $Id$ */
+
+/***
+  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 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, 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 <time.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.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 "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, *a;
+
+    pa_assert(src);
+    pa_assert(dst);
+    pa_assert(af == AF_INET || af == AF_INET6);
+
+    pa_assert_se(f = pa_rtp_format_to_string(ss->format));
+
+    if (!(u = pa_get_user_name(un, sizeof(un))))
+        u = "-";
+
+    ntp = time(NULL) + 2208988800U;
+
+    pa_assert_se(a = inet_ntop(af, src, buf_src, sizeof(buf_src)));
+    pa_assert_se(a = 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 if (pa_startswith(c, "L8/")) {
+        ss->format = PA_SAMPLE_U8;
+        c += 3;
+    } else if (pa_startswith(c, "PCMA/")) {
+        ss->format = PA_SAMPLE_ALAW;
+        c += 5;
+    } else if (pa_startswith(c, "PCMU/")) {
+        ss->format = PA_SAMPLE_ULAW;
+        c += 5;
+    } else
+        return NULL;
+
+    if (sscanf(c, "%u/%u", &rate, &channels) == 2) {
+        ss->rate = rate;
+        ss->channels = channels;
+    } else if (sscanf(c, "%u", &rate) == 2) {
+        ss->rate = 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;
+    int ss_valid = 0;
+
+    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);
+        } 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);
+        } 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 = 1;
+                }
+            }
+        } else if (pa_startswith(t, "a=rtpmap:")) {
+
+            if (i->payload <= 127) {
+                char c[64];
+                int _payload;
+
+                if (sscanf(t+9, "%i %64c", &_payload, c) == 2) {
+
+                    if (_payload < 0 || _payload > 127) {
+                        pa_log("Failed to parse SDP data: invalid payload %i.", _payload);
+                        goto fail;
+                    }
+                    if (_payload == i->payload) {
+
+                        c[strcspn(c, "\n")] = 0;
+
+                        if (parse_sdp_sample_spec(&i->sample_spec, c))
+                            ss_valid = 1;
+                    }
+                }
+            }
+        }
+
+        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);
+}