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, 223 insertions, 0 deletions

diff --git a/src/modules/rtp/sap.c b/src/modules/rtp/sap.c
new file mode 100644
index 00000000..ed7eb0be
--- /dev/null
+++ b/src/modules/rtp/sap.c
@@ -0,0 +1,223 @@
+/* $Id$ */
+
+/***
+  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 <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+#ifdef HAVE_SYS_FILIO_H
+#include <sys/filio.h>
+#endif
+
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/core-error.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/log.h>
+#include <pulsecore/macro.h>
+
+#include "sap.h"
+#include "sdp.h"
+
+#define MIME_TYPE "application/sdp"
+
+pa_sap_context* pa_sap_context_init_send(pa_sap_context *c, int fd, char *sdp_data) {
+    pa_assert(c);
+    pa_assert(fd >= 0);
+    pa_assert(sdp_data);
+
+    c->fd = fd;
+    c->sdp_data = sdp_data;
+    c->msg_id_hash = (uint16_t) (rand()*rand());
+
+    return c;
+}
+
+void pa_sap_context_destroy(pa_sap_context *c) {
+    pa_assert(c);
+
+    pa_close(c->fd);
+    pa_xfree(c->sdp_data);
+}
+
+int pa_sap_send(pa_sap_context *c, int goodbye) {
+    uint32_t header;
+    struct sockaddr_storage sa_buf;
+    struct sockaddr *sa = (struct sockaddr*) &sa_buf;
+    socklen_t salen = sizeof(sa_buf);
+    struct iovec iov[4];
+    struct msghdr m;
+    int k;
+
+    if (getsockname(c->fd, sa, &salen) < 0) {
+        pa_log("getsockname() failed: %s\n", pa_cstrerror(errno));
+        return -1;
+    }
+
+    pa_assert(sa->sa_family == AF_INET || sa->sa_family == AF_INET6);
+
+    header = htonl(((uint32_t) 1 << 29) |
+                   (sa->sa_family == AF_INET6 ? (uint32_t) 1 << 28 : 0) |
+                   (goodbye ? (uint32_t) 1 << 26 : 0) |
+                   (c->msg_id_hash));
+
+    iov[0].iov_base = &header;
+    iov[0].iov_len = sizeof(header);
+
+    iov[1].iov_base = sa->sa_family == AF_INET ? (void*) &((struct sockaddr_in*) sa)->sin_addr : (void*) &((struct sockaddr_in6*) sa)->sin6_addr;
+    iov[1].iov_len = sa->sa_family == AF_INET ? 4 : 16;
+
+    iov[2].iov_base = (char*) MIME_TYPE;
+    iov[2].iov_len = sizeof(MIME_TYPE);
+
+    iov[3].iov_base = c->sdp_data;
+    iov[3].iov_len = strlen(c->sdp_data);
+
+    m.msg_name = NULL;
+    m.msg_namelen = 0;
+    m.msg_iov = iov;
+    m.msg_iovlen = 4;
+    m.msg_control = NULL;
+    m.msg_controllen = 0;
+    m.msg_flags = 0;
+
+    if ((k = sendmsg(c->fd, &m, MSG_DONTWAIT)) < 0)
+        pa_log_warn("sendmsg() failed: %s\n", pa_cstrerror(errno));
+
+    return k;
+}
+
+pa_sap_context* pa_sap_context_init_recv(pa_sap_context *c, int fd) {
+    pa_assert(c);
+    pa_assert(fd >= 0);
+
+    c->fd = fd;
+    c->sdp_data = NULL;
+    return c;
+}
+
+int pa_sap_recv(pa_sap_context *c, int *goodbye) {
+    struct msghdr m;
+    struct iovec iov;
+    int size, k;
+    char *buf = NULL, *e;
+    uint32_t header;
+    int six, ac;
+    ssize_t r;
+
+    pa_assert(c);
+    pa_assert(goodbye);
+
+    if (ioctl(c->fd, FIONREAD, &size) < 0) {
+        pa_log_warn("FIONREAD failed: %s", pa_cstrerror(errno));
+        goto fail;
+    }
+
+    buf = pa_xnew(char, size+1);
+    buf[size] = 0;
+
+    iov.iov_base = buf;
+    iov.iov_len = size;
+
+    m.msg_name = NULL;
+    m.msg_namelen = 0;
+    m.msg_iov = &iov;
+    m.msg_iovlen = 1;
+    m.msg_control = NULL;
+    m.msg_controllen = 0;
+    m.msg_flags = 0;
+
+    if ((r = recvmsg(c->fd, &m, 0)) != size) {
+        pa_log_warn("recvmsg() failed: %s", r < 0 ? pa_cstrerror(errno) : "size mismatch");
+        goto fail;
+    }
+
+    if (size < 4) {
+        pa_log_warn("SAP packet too short.");
+        goto fail;
+    }
+
+    memcpy(&header, buf, sizeof(uint32_t));
+    header = ntohl(header);
+
+    if (header >> 29 != 1) {
+        pa_log_warn("Unsupported SAP version.");
+        goto fail;
+    }
+
+    if ((header >> 25) & 1) {
+        pa_log_warn("Encrypted SAP not supported.");
+        goto fail;
+    }
+
+    if ((header >> 24) & 1) {
+        pa_log_warn("Compressed SAP not supported.");
+        goto fail;
+    }
+
+    six = (header >> 28) & 1;
+    ac = (header >> 16) & 0xFF;
+
+    k = 4 + (six ? 16 : 4) + ac*4;
+    if (size < k) {
+        pa_log_warn("SAP packet too short (AD).");
+        goto fail;
+    }
+
+    e = buf + k;
+    size -= k;
+
+    if ((unsigned) size >= sizeof(MIME_TYPE) && !strcmp(e, MIME_TYPE)) {
+        e += sizeof(MIME_TYPE);
+        size -= sizeof(MIME_TYPE);
+    } else if ((unsigned) size < sizeof(PA_SDP_HEADER)-1 || strncmp(e, PA_SDP_HEADER, sizeof(PA_SDP_HEADER)-1)) {
+        pa_log_warn("Invalid SDP header.");
+        goto fail;
+    }
+
+    if (c->sdp_data)
+        pa_xfree(c->sdp_data);
+
+    c->sdp_data = pa_xstrndup(e, size);
+    pa_xfree(buf);
+
+    *goodbye = !!((header >> 26) & 1);
+
+    return 0;
+
+fail:
+    pa_xfree(buf);
+
+    return -1;
+}