Git init

1 files changed, 1292 insertions, 0 deletions

diff --git a/gst/udp/gstmultiudpsink.c b/gst/udp/gstmultiudpsink.c
new file mode 100644
index 0000000..bcdb6cd
--- /dev/null
+++ b/gst/udp/gstmultiudpsink.c
@@ -0,0 +1,1292 @@
+/* GStreamer
+ * Copyright (C) <2007> Wim Taymans <wim.taymans@gmail.com>
+ * Copyright (C) <2009> Jarkko Palviainen <jarkko.palviainen@sesca.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:element-multiudpsink
+ * @see_also: udpsink, multifdsink
+ *
+ * multiudpsink is a network sink that sends UDP packets to multiple
+ * clients.
+ * It can be combined with rtp payload encoders to implement RTP streaming.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "gstudp-marshal.h"
+#include "gstmultiudpsink.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <errno.h>
+#include <string.h>
+
+GST_DEBUG_CATEGORY_STATIC (multiudpsink_debug);
+#define GST_CAT_DEFAULT (multiudpsink_debug)
+
+#define UDP_MAX_SIZE 65507
+
+static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS_ANY);
+
+/* MultiUDPSink signals and args */
+enum
+{
+  /* methods */
+  SIGNAL_ADD,
+  SIGNAL_REMOVE,
+  SIGNAL_CLEAR,
+  SIGNAL_GET_STATS,
+
+  /* signals */
+  SIGNAL_CLIENT_ADDED,
+  SIGNAL_CLIENT_REMOVED,
+
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+#define DEFAULT_SOCKFD             -1
+#define DEFAULT_CLOSEFD            TRUE
+#define DEFAULT_SOCK               -1
+#define DEFAULT_CLIENTS            NULL
+#define DEFAULT_FAMILY             0
+/* FIXME, this should be disabled by default, we don't need to join a multicast
+ * group for sending, if this socket is also used for receiving, it should
+ * be configured in the element that does the receive. */
+#define DEFAULT_AUTO_MULTICAST     TRUE
+#define DEFAULT_TTL                64
+#define DEFAULT_TTL_MC             1
+#define DEFAULT_LOOP               TRUE
+#define DEFAULT_QOS_DSCP           -1
+#define DEFAULT_SEND_DUPLICATES    TRUE
+#define DEFAULT_BUFFER_SIZE        0
+
+enum
+{
+  PROP_0,
+  PROP_BYTES_TO_SERVE,
+  PROP_BYTES_SERVED,
+  PROP_SOCKFD,
+  PROP_CLOSEFD,
+  PROP_SOCK,
+  PROP_CLIENTS,
+  PROP_AUTO_MULTICAST,
+  PROP_TTL,
+  PROP_TTL_MC,
+  PROP_LOOP,
+  PROP_QOS_DSCP,
+  PROP_SEND_DUPLICATES,
+  PROP_BUFFER_SIZE,
+  PROP_LAST
+};
+
+#define CLOSE_IF_REQUESTED(udpctx)                                        \
+G_STMT_START {                                                            \
+  if ((!udpctx->externalfd) || (udpctx->externalfd && udpctx->closefd)) { \
+    CLOSE_SOCKET(udpctx->sock);                                           \
+    if (udpctx->sock == udpctx->sockfd)                                   \
+      udpctx->sockfd = DEFAULT_SOCKFD;                                    \
+  }                                                                       \
+  udpctx->sock = DEFAULT_SOCK;                                            \
+} G_STMT_END
+
+static void gst_multiudpsink_base_init (gpointer g_class);
+static void gst_multiudpsink_class_init (GstMultiUDPSinkClass * klass);
+static void gst_multiudpsink_init (GstMultiUDPSink * udpsink);
+static void gst_multiudpsink_finalize (GObject * object);
+
+static GstFlowReturn gst_multiudpsink_render (GstBaseSink * sink,
+    GstBuffer * buffer);
+#ifndef G_OS_WIN32              /* sendmsg() is not available on Windows */
+static GstFlowReturn gst_multiudpsink_render_list (GstBaseSink * bsink,
+    GstBufferList * list);
+#endif
+static GstStateChangeReturn gst_multiudpsink_change_state (GstElement *
+    element, GstStateChange transition);
+
+static void gst_multiudpsink_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_multiudpsink_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+
+static void gst_multiudpsink_add_internal (GstMultiUDPSink * sink,
+    const gchar * host, gint port, gboolean lock);
+static void gst_multiudpsink_clear_internal (GstMultiUDPSink * sink,
+    gboolean lock);
+
+static GstElementClass *parent_class = NULL;
+
+static guint gst_multiudpsink_signals[LAST_SIGNAL] = { 0 };
+
+GType
+gst_multiudpsink_get_type (void)
+{
+  static GType multiudpsink_type = 0;
+
+  if (!multiudpsink_type) {
+    static const GTypeInfo multiudpsink_info = {
+      sizeof (GstMultiUDPSinkClass),
+      gst_multiudpsink_base_init,
+      NULL,
+      (GClassInitFunc) gst_multiudpsink_class_init,
+      NULL,
+      NULL,
+      sizeof (GstMultiUDPSink),
+      0,
+      (GInstanceInitFunc) gst_multiudpsink_init,
+      NULL
+    };
+
+    multiudpsink_type =
+        g_type_register_static (GST_TYPE_BASE_SINK, "GstMultiUDPSink",
+        &multiudpsink_info, 0);
+  }
+  return multiudpsink_type;
+}
+
+static void
+gst_multiudpsink_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&sink_template));
+
+  gst_element_class_set_details_simple (element_class, "UDP packet sender",
+      "Sink/Network",
+      "Send data over the network via UDP",
+      "Wim Taymans <wim.taymans@gmail.com>");
+}
+
+static void
+gst_multiudpsink_class_init (GstMultiUDPSinkClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+  GstBaseSinkClass *gstbasesink_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+  gstbasesink_class = (GstBaseSinkClass *) klass;
+
+  parent_class = g_type_class_peek_parent (klass);
+
+  gobject_class->set_property = gst_multiudpsink_set_property;
+  gobject_class->get_property = gst_multiudpsink_get_property;
+  gobject_class->finalize = gst_multiudpsink_finalize;
+
+  /**
+   * GstMultiUDPSink::add:
+   * @gstmultiudpsink: the sink on which the signal is emitted
+   * @host: the hostname/IP address of the client to add
+   * @port: the port of the client to add
+   *
+   * Add a client with destination @host and @port to the list of
+   * clients. When the same host/port pair is added multiple times, the
+   * send-duplicates property defines if the packets are sent multiple times to
+   * the same host/port pair or not.
+   *
+   * When a host/port pair is added multiple times, an equal amount of remove
+   * calls must be performed to actually remove the host/port pair from the list
+   * of destinations.
+   */
+  gst_multiudpsink_signals[SIGNAL_ADD] =
+      g_signal_new ("add", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
+      G_STRUCT_OFFSET (GstMultiUDPSinkClass, add),
+      NULL, NULL, gst_udp_marshal_VOID__STRING_INT, G_TYPE_NONE, 2,
+      G_TYPE_STRING, G_TYPE_INT);
+  /**
+   * GstMultiUDPSink::remove:
+   * @gstmultiudpsink: the sink on which the signal is emitted
+   * @host: the hostname/IP address of the client to remove
+   * @port: the port of the client to remove
+   *
+   * Remove the client with destination @host and @port from the list of
+   * clients.
+   */
+  gst_multiudpsink_signals[SIGNAL_REMOVE] =
+      g_signal_new ("remove", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
+      G_STRUCT_OFFSET (GstMultiUDPSinkClass, remove),
+      NULL, NULL, gst_udp_marshal_VOID__STRING_INT, G_TYPE_NONE, 2,
+      G_TYPE_STRING, G_TYPE_INT);
+  /**
+   * GstMultiUDPSink::clear:
+   * @gstmultiudpsink: the sink on which the signal is emitted
+   *
+   * Clear the list of clients.
+   */
+  gst_multiudpsink_signals[SIGNAL_CLEAR] =
+      g_signal_new ("clear", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
+      G_STRUCT_OFFSET (GstMultiUDPSinkClass, clear),
+      NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
+  /**
+   * GstMultiUDPSink::get-stats:
+   * @gstmultiudpsink: the sink on which the signal is emitted
+   * @host: the hostname/IP address of the client to get stats on
+   * @port: the port of the client to get stats on
+   *
+   * Get the statistics of the client with destination @host and @port.
+   *
+   * Returns: a GValueArray of uint64: bytes_sent, packets_sent,
+   *           connect_time (in epoch seconds), disconnect_time (in epoch seconds)
+   */
+  gst_multiudpsink_signals[SIGNAL_GET_STATS] =
+      g_signal_new ("get-stats", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
+      G_STRUCT_OFFSET (GstMultiUDPSinkClass, get_stats),
+      NULL, NULL, gst_udp_marshal_BOXED__STRING_INT, G_TYPE_VALUE_ARRAY, 2,
+      G_TYPE_STRING, G_TYPE_INT);
+  /**
+   * GstMultiUDPSink::client-added:
+   * @gstmultiudpsink: the sink emitting the signal
+   * @host: the hostname/IP address of the added client
+   * @port: the port of the added client
+   *
+   * Signal emited when a new client is added to the list of
+   * clients.
+   */
+  gst_multiudpsink_signals[SIGNAL_CLIENT_ADDED] =
+      g_signal_new ("client-added", G_TYPE_FROM_CLASS (klass),
+      G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstMultiUDPSinkClass, client_added),
+      NULL, NULL, gst_udp_marshal_VOID__STRING_INT, G_TYPE_NONE, 2,
+      G_TYPE_STRING, G_TYPE_INT);
+  /**
+   * GstMultiUDPSink::client-removed:
+   * @gstmultiudpsink: the sink emitting the signal
+   * @host: the hostname/IP address of the removed client
+   * @port: the port of the removed client
+   *
+   * Signal emited when a client is removed from the list of
+   * clients.
+   */
+  gst_multiudpsink_signals[SIGNAL_CLIENT_REMOVED] =
+      g_signal_new ("client-removed", G_TYPE_FROM_CLASS (klass),
+      G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstMultiUDPSinkClass,
+          client_removed), NULL, NULL, gst_udp_marshal_VOID__STRING_INT,
+      G_TYPE_NONE, 2, G_TYPE_STRING, G_TYPE_INT);
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BYTES_TO_SERVE,
+      g_param_spec_uint64 ("bytes-to-serve", "Bytes to serve",
+          "Number of bytes received to serve to clients", 0, G_MAXUINT64, 0,
+          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BYTES_SERVED,
+      g_param_spec_uint64 ("bytes-served", "Bytes served",
+          "Total number of bytes send to all clients", 0, G_MAXUINT64, 0,
+          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_SOCKFD,
+      g_param_spec_int ("sockfd", "Socket Handle",
+          "Socket to use for UDP sending. (-1 == allocate)",
+          -1, G_MAXINT, DEFAULT_SOCKFD,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_CLOSEFD,
+      g_param_spec_boolean ("closefd", "Close sockfd",
+          "Close sockfd if passed as property on state change",
+          DEFAULT_CLOSEFD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_SOCK,
+      g_param_spec_int ("sock", "Socket Handle",
+          "Socket currently in use for UDP sending. (-1 == no socket)",
+          -1, G_MAXINT, DEFAULT_SOCK,
+          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_CLIENTS,
+      g_param_spec_string ("clients", "Clients",
+          "A comma separated list of host:port pairs with destinations",
+          DEFAULT_CLIENTS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_AUTO_MULTICAST,
+      g_param_spec_boolean ("auto-multicast",
+          "Automatically join/leave multicast groups",
+          "Automatically join/leave the multicast groups, FALSE means user"
+          " has to do it himself", DEFAULT_AUTO_MULTICAST,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_TTL,
+      g_param_spec_int ("ttl", "Unicast TTL",
+          "Used for setting the unicast TTL parameter",
+          0, 255, DEFAULT_TTL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_TTL_MC,
+      g_param_spec_int ("ttl-mc", "Multicast TTL",
+          "Used for setting the multicast TTL parameter",
+          0, 255, DEFAULT_TTL_MC, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_LOOP,
+      g_param_spec_boolean ("loop", "Multicast Loopback",
+          "Used for setting the multicast loop parameter. TRUE = enable,"
+          " FALSE = disable", DEFAULT_LOOP,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_QOS_DSCP,
+      g_param_spec_int ("qos-dscp", "QoS diff srv code point",
+          "Quality of Service, differentiated services code point (-1 default)",
+          -1, 63, DEFAULT_QOS_DSCP,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+  /**
+   * GstMultiUDPSink::send-duplicates
+   *
+   * When a host/port pair is added mutliple times, send the packet to the host
+   * multiple times as well.
+   *
+   * Since: 0.10.26
+   */
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEND_DUPLICATES,
+      g_param_spec_boolean ("send-duplicates", "Send Duplicates",
+          "When a distination/port pair is added multiple times, send packets "
+          "multiple times as well", DEFAULT_SEND_DUPLICATES,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BUFFER_SIZE,
+      g_param_spec_int ("buffer-size", "Buffer Size",
+          "Size of the kernel send buffer in bytes, 0=default", 0, G_MAXINT,
+          DEFAULT_BUFFER_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  gstelement_class->change_state = gst_multiudpsink_change_state;
+
+  gstbasesink_class->render = gst_multiudpsink_render;
+#ifndef G_OS_WIN32
+  gstbasesink_class->render_list = gst_multiudpsink_render_list;
+#endif
+  klass->add = gst_multiudpsink_add;
+  klass->remove = gst_multiudpsink_remove;
+  klass->clear = gst_multiudpsink_clear;
+  klass->get_stats = gst_multiudpsink_get_stats;
+
+  GST_DEBUG_CATEGORY_INIT (multiudpsink_debug, "multiudpsink", 0, "UDP sink");
+}
+
+
+static void
+gst_multiudpsink_init (GstMultiUDPSink * sink)
+{
+  WSA_STARTUP (sink);
+
+  sink->client_lock = g_mutex_new ();
+  sink->sock = DEFAULT_SOCK;
+  sink->sockfd = DEFAULT_SOCKFD;
+  sink->closefd = DEFAULT_CLOSEFD;
+  sink->externalfd = (sink->sockfd != -1);
+  sink->auto_multicast = DEFAULT_AUTO_MULTICAST;
+  sink->ttl = DEFAULT_TTL;
+  sink->ttl_mc = DEFAULT_TTL_MC;
+  sink->loop = DEFAULT_LOOP;
+  sink->qos_dscp = DEFAULT_QOS_DSCP;
+  sink->ss_family = DEFAULT_FAMILY;
+  sink->send_duplicates = DEFAULT_SEND_DUPLICATES;
+}
+
+static GstUDPClient *
+create_client (GstMultiUDPSink * sink, const gchar * host, gint port)
+{
+  GstUDPClient *client;
+
+  client = g_slice_new0 (GstUDPClient);
+  client->refcount = 1;
+  client->host = g_strdup (host);
+  client->port = port;
+
+  return client;
+}
+
+static void
+free_client (GstUDPClient * client)
+{
+  g_free (client->host);
+  g_slice_free (GstUDPClient, client);
+}
+
+static gint
+client_compare (GstUDPClient * a, GstUDPClient * b)
+{
+  if ((a->port == b->port) && (strcmp (a->host, b->host) == 0))
+    return 0;
+
+  return 1;
+}
+
+static void
+gst_multiudpsink_finalize (GObject * object)
+{
+  GstMultiUDPSink *sink;
+
+  sink = GST_MULTIUDPSINK (object);
+
+  g_list_foreach (sink->clients, (GFunc) free_client, NULL);
+  g_list_free (sink->clients);
+
+  if (sink->sockfd >= 0 && sink->closefd)
+    CLOSE_SOCKET (sink->sockfd);
+
+  g_mutex_free (sink->client_lock);
+
+  WSA_CLEANUP (object);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static gboolean
+socket_error_is_ignorable (void)
+{
+#ifdef G_OS_WIN32
+  /* Windows doesn't seem to have an EAGAIN for sockets */
+  return WSAGetLastError () == WSAEINTR;
+#else
+  return errno == EINTR || errno == EAGAIN;
+#endif
+}
+
+static int
+socket_last_error_code (void)
+{
+#ifdef G_OS_WIN32
+  return WSAGetLastError ();
+#else
+  return errno;
+#endif
+}
+
+static gchar *
+socket_last_error_message (void)
+{
+#ifdef G_OS_WIN32
+  int errorcode = WSAGetLastError ();
+  wchar_t buf[1024];
+  DWORD result =
+      FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+      NULL, errorcode, 0, (LPSTR) buf, sizeof (buf) / sizeof (wchar_t), NULL);
+  if (FAILED (result)) {
+    return g_strdup ("failed to get error message from system");
+  } else {
+    gchar *res =
+        g_convert ((gchar *) buf, -1, "UTF-16", "UTF-8", NULL, NULL, NULL);
+    /* g_convert() internally calls windows functions which reset the
+       windows error code, so fix it up again like this */
+    WSASetLastError (errorcode);
+    return res;
+  }
+#else
+  return g_strdup (g_strerror (errno));
+#endif
+}
+
+static GstFlowReturn
+gst_multiudpsink_render (GstBaseSink * bsink, GstBuffer * buffer)
+{
+  GstMultiUDPSink *sink;
+  gint ret, size, num = 0, no_clients = 0;
+  guint8 *data;
+  GList *clients;
+  gint len;
+
+  sink = GST_MULTIUDPSINK (bsink);
+
+  size = GST_BUFFER_SIZE (buffer);
+  data = GST_BUFFER_DATA (buffer);
+
+  if (size > UDP_MAX_SIZE) {
+    GST_WARNING ("Attempting to send a UDP packet larger than maximum "
+        "size (%d > %d)", size, UDP_MAX_SIZE);
+  }
+
+  sink->bytes_to_serve += size;
+
+  /* grab lock while iterating and sending to clients, this should be
+   * fast as UDP never blocks */
+  g_mutex_lock (sink->client_lock);
+  GST_LOG_OBJECT (bsink, "about to send %d bytes", size);
+
+  for (clients = sink->clients; clients; clients = g_list_next (clients)) {
+    GstUDPClient *client;
+    gint count;
+
+    client = (GstUDPClient *) clients->data;
+    no_clients++;
+    GST_LOG_OBJECT (sink, "sending %d bytes to client %p", size, client);
+
+    count = sink->send_duplicates ? client->refcount : 1;
+
+    while (count--) {
+      while (TRUE) {
+        len = gst_udp_get_sockaddr_length (&client->theiraddr);
+
+        ret = sendto (*client->sock,
+#ifdef G_OS_WIN32
+            (char *) data,
+#else
+            data,
+#endif
+            size, 0, (struct sockaddr *) &client->theiraddr, len);
+
+        if (ret < 0) {
+          /* some error, just warn, it's likely recoverable and we don't want to
+           * break streaming. We break so that we stop retrying for this client. */
+          if (!socket_error_is_ignorable ()) {
+            gchar *errormessage = socket_last_error_message ();
+            GST_WARNING_OBJECT (sink, "client %p gave error %d (%s)", client,
+                socket_last_error_code (), errormessage);
+            g_free (errormessage);
+            break;
+          }
+        } else {
+          num++;
+          client->bytes_sent += ret;
+          client->packets_sent++;
+          sink->bytes_served += ret;
+          break;
+        }
+      }
+    }
+  }
+  g_mutex_unlock (sink->client_lock);
+
+  GST_LOG_OBJECT (sink, "sent %d bytes to %d (of %d) clients", size, num,
+      no_clients);
+
+  return GST_FLOW_OK;
+}
+
+#ifndef G_OS_WIN32
+static GstFlowReturn
+gst_multiudpsink_render_list (GstBaseSink * bsink, GstBufferList * list)
+{
+  GstMultiUDPSink *sink;
+  GList *clients;
+  gint ret, size = 0, num = 0, no_clients = 0;
+  struct iovec *iov;
+  struct msghdr msg = { 0 };
+
+  GstBufferListIterator *it;
+  guint gsize;
+  GstBuffer *buf;
+
+  sink = GST_MULTIUDPSINK (bsink);
+
+  g_return_val_if_fail (list != NULL, GST_FLOW_ERROR);
+
+  it = gst_buffer_list_iterate (list);
+  g_return_val_if_fail (it != NULL, GST_FLOW_ERROR);
+
+  while (gst_buffer_list_iterator_next_group (it)) {
+    msg.msg_iovlen = 0;
+    size = 0;
+
+    if ((gsize = gst_buffer_list_iterator_n_buffers (it)) == 0) {
+      goto invalid_list;
+    }
+
+    iov = (struct iovec *) g_malloc (gsize * sizeof (struct iovec));
+    msg.msg_iov = iov;
+
+    while ((buf = gst_buffer_list_iterator_next (it))) {
+      if (GST_BUFFER_SIZE (buf) > UDP_MAX_SIZE) {
+        GST_WARNING ("Attempting to send a UDP packet larger than maximum "
+            "size (%d > %d)", GST_BUFFER_SIZE (buf), UDP_MAX_SIZE);
+      }
+
+      msg.msg_iov[msg.msg_iovlen].iov_len = GST_BUFFER_SIZE (buf);
+      msg.msg_iov[msg.msg_iovlen].iov_base = GST_BUFFER_DATA (buf);
+      msg.msg_iovlen++;
+      size += GST_BUFFER_SIZE (buf);
+    }
+
+    sink->bytes_to_serve += size;
+
+    /* grab lock while iterating and sending to clients, this should be
+     * fast as UDP never blocks */
+    g_mutex_lock (sink->client_lock);
+    GST_LOG_OBJECT (bsink, "about to send %d bytes", size);
+
+    for (clients = sink->clients; clients; clients = g_list_next (clients)) {
+      GstUDPClient *client;
+      gint count;
+
+      client = (GstUDPClient *) clients->data;
+      no_clients++;
+      GST_LOG_OBJECT (sink, "sending %d bytes to client %p", size, client);
+
+      count = sink->send_duplicates ? client->refcount : 1;
+
+      while (count--) {
+        while (TRUE) {
+          msg.msg_name = (void *) &client->theiraddr;
+          msg.msg_namelen = sizeof (client->theiraddr);
+          ret = sendmsg (*client->sock, &msg, 0);
+
+          if (ret < 0) {
+            if (!socket_error_is_ignorable ()) {
+              break;
+            }
+          } else {
+            num++;
+            client->bytes_sent += ret;
+            client->packets_sent++;
+            sink->bytes_served += ret;
+            break;
+          }
+        }
+      }
+    }
+    g_mutex_unlock (sink->client_lock);
+
+    g_free (iov);
+    msg.msg_iov = NULL;
+
+    GST_LOG_OBJECT (sink, "sent %d bytes to %d (of %d) clients", size, num,
+        no_clients);
+  }
+
+  gst_buffer_list_iterator_free (it);
+
+  return GST_FLOW_OK;
+
+invalid_list:
+  gst_buffer_list_iterator_free (it);
+  return GST_FLOW_ERROR;
+}
+#endif
+
+static void
+gst_multiudpsink_set_clients_string (GstMultiUDPSink * sink,
+    const gchar * string)
+{
+  gchar **clients;
+  gint i;
+
+  clients = g_strsplit (string, ",", 0);
+
+  g_mutex_lock (sink->client_lock);
+  /* clear all existing clients */
+  gst_multiudpsink_clear_internal (sink, FALSE);
+  for (i = 0; clients[i]; i++) {
+    gchar *host, *p;
+    gint port = 0;
+
+    host = clients[i];
+    p = strstr (clients[i], ":");
+    if (p != NULL) {
+      *p = '\0';
+      port = atoi (p + 1);
+    }
+    if (port != 0)
+      gst_multiudpsink_add_internal (sink, host, port, FALSE);
+  }
+  g_mutex_unlock (sink->client_lock);
+
+  g_strfreev (clients);
+}
+
+static gchar *
+gst_multiudpsink_get_clients_string (GstMultiUDPSink * sink)
+{
+  GString *str;
+  GList *clients;
+
+  str = g_string_new ("");
+
+  g_mutex_lock (sink->client_lock);
+  clients = sink->clients;
+  while (clients) {
+    GstUDPClient *client;
+    gint count;
+
+    client = (GstUDPClient *) clients->data;
+
+    clients = g_list_next (clients);
+
+    count = client->refcount;
+    while (count--) {
+      g_string_append_printf (str, "%s:%d%s", client->host, client->port,
+          (clients || count > 1 ? "," : ""));
+    }
+  }
+  g_mutex_unlock (sink->client_lock);
+
+  return g_string_free (str, FALSE);
+}
+
+static void
+gst_multiudpsink_setup_qos_dscp (GstMultiUDPSink * sink)
+{
+  gint tos;
+
+  /* don't touch on -1 */
+  if (sink->qos_dscp < 0)
+    return;
+
+  if (sink->sock < 0)
+    return;
+
+  GST_DEBUG_OBJECT (sink, "setting TOS to %d", sink->qos_dscp);
+
+  /* Extract and shift 6 bits of DSFIELD */
+  tos = (sink->qos_dscp & 0x3f) << 2;
+
+  if (setsockopt (sink->sock, IPPROTO_IP, IP_TOS, &tos, sizeof (tos)) < 0) {
+    gchar *errormessage = socket_last_error_message ();
+    GST_ERROR_OBJECT (sink, "could not set TOS: %s", errormessage);
+    g_free (errormessage);
+  }
+#ifdef IPV6_TCLASS
+  if (setsockopt (sink->sock, IPPROTO_IPV6, IPV6_TCLASS, &tos,
+          sizeof (tos)) < 0) {
+    gchar *errormessage = socket_last_error_message ();
+    GST_ERROR_OBJECT (sink, "could not set TCLASS: %s", errormessage);
+    g_free (errormessage);
+  }
+#endif
+}
+
+static void
+gst_multiudpsink_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstMultiUDPSink *udpsink;
+
+  udpsink = GST_MULTIUDPSINK (object);
+
+  switch (prop_id) {
+    case PROP_SOCKFD:
+      if (udpsink->sockfd >= 0 && udpsink->sockfd != udpsink->sock &&
+          udpsink->closefd)
+        CLOSE_SOCKET (udpsink->sockfd);
+      udpsink->sockfd = g_value_get_int (value);
+      GST_DEBUG_OBJECT (udpsink, "setting SOCKFD to %d", udpsink->sockfd);
+      break;
+    case PROP_CLOSEFD:
+      udpsink->closefd = g_value_get_boolean (value);
+      break;
+    case PROP_CLIENTS:
+      gst_multiudpsink_set_clients_string (udpsink, g_value_get_string (value));
+      break;
+    case PROP_AUTO_MULTICAST:
+      udpsink->auto_multicast = g_value_get_boolean (value);
+      break;
+    case PROP_TTL:
+      udpsink->ttl = g_value_get_int (value);
+      break;
+    case PROP_TTL_MC:
+      udpsink->ttl_mc = g_value_get_int (value);
+      break;
+    case PROP_LOOP:
+      udpsink->loop = g_value_get_boolean (value);
+      break;
+    case PROP_QOS_DSCP:
+      udpsink->qos_dscp = g_value_get_int (value);
+      gst_multiudpsink_setup_qos_dscp (udpsink);
+      break;
+    case PROP_SEND_DUPLICATES:
+      udpsink->send_duplicates = g_value_get_boolean (value);
+      break;
+    case PROP_BUFFER_SIZE:
+      udpsink->buffer_size = g_value_get_int (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_multiudpsink_get_property (GObject * object, guint prop_id, GValue * value,
+    GParamSpec * pspec)
+{
+  GstMultiUDPSink *udpsink;
+
+  udpsink = GST_MULTIUDPSINK (object);
+
+  switch (prop_id) {
+    case PROP_BYTES_TO_SERVE:
+      g_value_set_uint64 (value, udpsink->bytes_to_serve);
+      break;
+    case PROP_BYTES_SERVED:
+      g_value_set_uint64 (value, udpsink->bytes_served);
+      break;
+    case PROP_SOCKFD:
+      g_value_set_int (value, udpsink->sockfd);
+      break;
+    case PROP_CLOSEFD:
+      g_value_set_boolean (value, udpsink->closefd);
+      break;
+    case PROP_SOCK:
+      g_value_set_int (value, udpsink->sock);
+      break;
+    case PROP_CLIENTS:
+      g_value_take_string (value,
+          gst_multiudpsink_get_clients_string (udpsink));
+      break;
+    case PROP_AUTO_MULTICAST:
+      g_value_set_boolean (value, udpsink->auto_multicast);
+      break;
+    case PROP_TTL:
+      g_value_set_int (value, udpsink->ttl);
+      break;
+    case PROP_TTL_MC:
+      g_value_set_int (value, udpsink->ttl_mc);
+      break;
+    case PROP_LOOP:
+      g_value_set_boolean (value, udpsink->loop);
+      break;
+    case PROP_QOS_DSCP:
+      g_value_set_int (value, udpsink->qos_dscp);
+      break;
+    case PROP_SEND_DUPLICATES:
+      g_value_set_boolean (value, udpsink->send_duplicates);
+      break;
+    case PROP_BUFFER_SIZE:
+      g_value_set_int (value, udpsink->buffer_size);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static gboolean
+gst_multiudpsink_configure_client (GstMultiUDPSink * sink,
+    GstUDPClient * client)
+{
+  GST_DEBUG_OBJECT (sink, "configuring client %p", client);
+
+  if (gst_udp_is_multicast (&client->theiraddr)) {
+    GST_DEBUG_OBJECT (sink, "we have a multicast client %p", client);
+    if (sink->auto_multicast) {
+      GST_DEBUG_OBJECT (sink, "autojoining group");
+      if (gst_udp_join_group (*(client->sock), &client->theiraddr, NULL)
+          != 0)
+        goto join_group_failed;
+    }
+    GST_DEBUG_OBJECT (sink, "setting loop to %d", sink->loop);
+    if (gst_udp_set_loop (sink->sock, sink->ss_family, sink->loop) != 0)
+      goto loop_failed;
+    GST_DEBUG_OBJECT (sink, "setting ttl to %d", sink->ttl_mc);
+    if (gst_udp_set_ttl (sink->sock, sink->ss_family, sink->ttl_mc, TRUE) != 0)
+      goto ttl_failed;
+  } else {
+    GST_DEBUG_OBJECT (sink, "setting unicast ttl to %d", sink->ttl);
+    if (gst_udp_set_ttl (sink->sock, sink->ss_family, sink->ttl, FALSE) != 0)
+      goto ttl_failed;
+  }
+  return TRUE;
+
+  /* ERRORS */
+join_group_failed:
+  {
+    gchar *errormessage = socket_last_error_message ();
+    int errorcode = socket_last_error_code ();
+    CLOSE_IF_REQUESTED (sink);
+    GST_ELEMENT_ERROR (sink, RESOURCE, SETTINGS, (NULL),
+        ("Could not join multicast group (%d): %s", errorcode, errormessage));
+    g_free (errormessage);
+    return FALSE;
+  }
+ttl_failed:
+  {
+    gchar *errormessage = socket_last_error_message ();
+    int errorcode = socket_last_error_code ();
+    CLOSE_IF_REQUESTED (sink);
+    GST_ELEMENT_ERROR (sink, RESOURCE, SETTINGS, (NULL),
+        ("Could not set TTL socket option (%d): %s", errorcode, errormessage));
+    g_free (errormessage);
+    return FALSE;
+  }
+loop_failed:
+  {
+    gchar *errormessage = socket_last_error_message ();
+    int errorcode = socket_last_error_code ();
+    CLOSE_IF_REQUESTED (sink);
+    GST_ELEMENT_ERROR (sink, RESOURCE, SETTINGS, (NULL),
+        ("Could not set loopback socket option (%d): %s",
+            errorcode, errormessage));
+    g_free (errormessage);
+    return FALSE;
+  }
+}
+
+/* create a socket for sending to remote machine */
+static gboolean
+gst_multiudpsink_init_send (GstMultiUDPSink * sink)
+{
+  guint bc_val;
+  GList *clients;
+  GstUDPClient *client;
+  int sndsize, ret;
+  socklen_t len;
+
+  if (sink->sockfd == -1) {
+    GST_DEBUG_OBJECT (sink, "creating sockets");
+    /* create sender socket try IP6, fall back to IP4 */
+    sink->ss_family = AF_INET6;
+    if ((sink->sock = socket (AF_INET6, SOCK_DGRAM, 0)) == -1) {
+      sink->ss_family = AF_INET;
+      if ((sink->sock = socket (AF_INET, SOCK_DGRAM, 0)) == -1)
+        goto no_socket;
+    }
+
+    GST_DEBUG_OBJECT (sink, "have socket");
+    sink->externalfd = FALSE;
+  } else {
+    struct sockaddr_storage myaddr;
+
+    GST_DEBUG_OBJECT (sink, "using configured socket");
+    /* we use the configured socket, try to get some info about it */
+    len = sizeof (myaddr);
+    if (getsockname (sink->sockfd, (struct sockaddr *) &myaddr, &len) < 0)
+      goto getsockname_error;
+
+    sink->ss_family = myaddr.ss_family;
+    /* we use the configured socket */
+    sink->sock = sink->sockfd;
+    sink->externalfd = TRUE;
+  }
+
+  len = sizeof (sndsize);
+  if (sink->buffer_size != 0) {
+    sndsize = sink->buffer_size;
+
+    GST_DEBUG_OBJECT (sink, "setting udp buffer of %d bytes", sndsize);
+    /* set buffer size, Note that on Linux this is typically limited to a
+     * maximum of around 100K. Also a minimum of 128 bytes is required on
+     * Linux. */
+    ret =
+        setsockopt (sink->sockfd, SOL_SOCKET, SO_SNDBUF, (void *) &sndsize,
+        len);
+    if (ret != 0) {
+      GST_ELEMENT_WARNING (sink, RESOURCE, SETTINGS, (NULL),
+          ("Could not create a buffer of requested %d bytes, %d: %s (%d)",
+              sndsize, ret, g_strerror (errno), errno));
+    }
+  }
+
+  /* read the value of the receive buffer. Note that on linux this returns 2x the
+   * value we set because the kernel allocates extra memory for metadata.
+   * The default on Linux is about 100K (which is about 50K without metadata) */
+  ret =
+      getsockopt (sink->sockfd, SOL_SOCKET, SO_SNDBUF, (void *) &sndsize, &len);
+  if (ret == 0)
+    GST_DEBUG_OBJECT (sink, "have udp buffer of %d bytes", sndsize);
+  else
+    GST_DEBUG_OBJECT (sink, "could not get udp buffer size");
+
+
+  bc_val = 1;
+  if (setsockopt (sink->sock, SOL_SOCKET, SO_BROADCAST, &bc_val,
+          sizeof (bc_val)) < 0)
+    goto no_broadcast;
+
+  sink->bytes_to_serve = 0;
+  sink->bytes_served = 0;
+
+  gst_multiudpsink_setup_qos_dscp (sink);
+
+  /* look for multicast clients and join multicast groups appropriately
+     set also ttl and multicast loopback delivery appropriately  */
+  for (clients = sink->clients; clients; clients = g_list_next (clients)) {
+    client = (GstUDPClient *) clients->data;
+
+    if (!gst_multiudpsink_configure_client (sink, client))
+      return FALSE;
+  }
+  return TRUE;
+
+  /* ERRORS */
+no_socket:
+  {
+    gchar *errormessage = socket_last_error_message ();
+    int errorcode = socket_last_error_code ();
+    GST_ELEMENT_ERROR (sink, RESOURCE, FAILED, (NULL),
+        ("Could not create socket (%d): %s", errorcode, errormessage));
+    g_free (errormessage);
+    return FALSE;
+  }
+getsockname_error:
+  {
+    gchar *errormessage = socket_last_error_message ();
+    int errorcode = socket_last_error_code ();
+    GST_ELEMENT_ERROR (sink, RESOURCE, FAILED, (NULL),
+        ("Could not getsockname (%d): %s", errorcode, errormessage));
+    g_free (errormessage);
+    return FALSE;
+  }
+no_broadcast:
+  {
+    gchar *errormessage = socket_last_error_message ();
+    int errorcode = socket_last_error_code ();
+    CLOSE_IF_REQUESTED (sink);
+    GST_ELEMENT_ERROR (sink, RESOURCE, SETTINGS, (NULL),
+        ("Could not set broadcast socket option (%d): %s",
+            errorcode, errormessage));
+    g_free (errormessage);
+    return FALSE;
+  }
+}
+
+static void
+gst_multiudpsink_close (GstMultiUDPSink * sink)
+{
+  CLOSE_IF_REQUESTED (sink);
+}
+
+static void
+gst_multiudpsink_add_internal (GstMultiUDPSink * sink, const gchar * host,
+    gint port, gboolean lock)
+{
+  GstUDPClient *client;
+  GstUDPClient udpclient;
+  GTimeVal now;
+  GList *find;
+
+  udpclient.host = (gchar *) host;
+  udpclient.port = port;
+
+  GST_DEBUG_OBJECT (sink, "adding client on host %s, port %d", host, port);
+
+  if (lock)
+    g_mutex_lock (sink->client_lock);
+
+  find = g_list_find_custom (sink->clients, &udpclient,
+      (GCompareFunc) client_compare);
+  if (find) {
+    client = (GstUDPClient *) find->data;
+
+    GST_DEBUG_OBJECT (sink, "found %d existing clients with host %s, port %d",
+        client->refcount, host, port);
+    client->refcount++;
+  } else {
+    client = create_client (sink, host, port);
+
+    client->sock = &sink->sock;
+
+    if (gst_udp_get_addr (host, port, &client->theiraddr) < 0)
+      goto getaddrinfo_error;
+
+    g_get_current_time (&now);
+    client->connect_time = GST_TIMEVAL_TO_TIME (now);
+
+    if (*client->sock > 0) {
+      gst_multiudpsink_configure_client (sink, client);
+    }
+
+    GST_DEBUG_OBJECT (sink, "add client with host %s, port %d", host, port);
+    sink->clients = g_list_prepend (sink->clients, client);
+  }
+
+  if (lock)
+    g_mutex_unlock (sink->client_lock);
+
+  g_signal_emit (G_OBJECT (sink),
+      gst_multiudpsink_signals[SIGNAL_CLIENT_ADDED], 0, host, port);
+
+  GST_DEBUG_OBJECT (sink, "added client on host %s, port %d", host, port);
+  return;
+
+  /* ERRORS */
+getaddrinfo_error:
+  {
+    GST_DEBUG_OBJECT (sink, "did not add client on host %s, port %d", host,
+        port);
+    GST_WARNING_OBJECT (sink, "getaddrinfo lookup error?");
+    free_client (client);
+    if (lock)
+      g_mutex_unlock (sink->client_lock);
+    return;
+  }
+}
+
+void
+gst_multiudpsink_add (GstMultiUDPSink * sink, const gchar * host, gint port)
+{
+  gst_multiudpsink_add_internal (sink, host, port, TRUE);
+}
+
+void
+gst_multiudpsink_remove (GstMultiUDPSink * sink, const gchar * host, gint port)
+{
+  GList *find;
+  GstUDPClient udpclient;
+  GstUDPClient *client;
+  GTimeVal now;
+
+  udpclient.host = (gchar *) host;
+  udpclient.port = port;
+
+  g_mutex_lock (sink->client_lock);
+  find = g_list_find_custom (sink->clients, &udpclient,
+      (GCompareFunc) client_compare);
+  if (!find)
+    goto not_found;
+
+  client = (GstUDPClient *) find->data;
+
+  GST_DEBUG_OBJECT (sink, "found %d clients with host %s, port %d",
+      client->refcount, host, port);
+
+  client->refcount--;
+  if (client->refcount == 0) {
+    GST_DEBUG_OBJECT (sink, "remove client with host %s, port %d", host, port);
+
+    g_get_current_time (&now);
+    client->disconnect_time = GST_TIMEVAL_TO_TIME (now);
+
+    if (*(client->sock) != -1 && sink->auto_multicast
+        && gst_udp_is_multicast (&client->theiraddr))
+      gst_udp_leave_group (*(client->sock), &client->theiraddr);
+
+    /* Unlock to emit signal before we delete the actual client */
+    g_mutex_unlock (sink->client_lock);
+    g_signal_emit (G_OBJECT (sink),
+        gst_multiudpsink_signals[SIGNAL_CLIENT_REMOVED], 0, host, port);
+    g_mutex_lock (sink->client_lock);
+
+    sink->clients = g_list_delete_link (sink->clients, find);
+
+    free_client (client);
+  }
+  g_mutex_unlock (sink->client_lock);
+
+  return;
+
+  /* ERRORS */
+not_found:
+  {
+    g_mutex_unlock (sink->client_lock);
+    GST_WARNING_OBJECT (sink, "client at host %s, port %d not found",
+        host, port);
+    return;
+  }
+}
+
+static void
+gst_multiudpsink_clear_internal (GstMultiUDPSink * sink, gboolean lock)
+{
+  GST_DEBUG_OBJECT (sink, "clearing");
+  /* we only need to remove the client structure, there is no additional
+   * socket or anything to free for UDP */
+  if (lock)
+    g_mutex_lock (sink->client_lock);
+  g_list_foreach (sink->clients, (GFunc) free_client, sink);
+  g_list_free (sink->clients);
+  sink->clients = NULL;
+  if (lock)
+    g_mutex_unlock (sink->client_lock);
+}
+
+void
+gst_multiudpsink_clear (GstMultiUDPSink * sink)
+{
+  gst_multiudpsink_clear_internal (sink, TRUE);
+}
+
+GValueArray *
+gst_multiudpsink_get_stats (GstMultiUDPSink * sink, const gchar * host,
+    gint port)
+{
+  GstUDPClient *client;
+  GValueArray *result = NULL;
+  GstUDPClient udpclient;
+  GList *find;
+  GValue value = { 0 };
+
+  udpclient.host = (gchar *) host;
+  udpclient.port = port;
+
+  g_mutex_lock (sink->client_lock);
+
+  find = g_list_find_custom (sink->clients, &udpclient,
+      (GCompareFunc) client_compare);
+  if (!find)
+    goto not_found;
+
+  GST_DEBUG_OBJECT (sink, "stats for client with host %s, port %d", host, port);
+
+  client = (GstUDPClient *) find->data;
+
+  /* Result is a value array of (bytes_sent, packets_sent,
+   * connect_time, disconnect_time), all as uint64 */
+  result = g_value_array_new (4);
+
+  g_value_init (&value, G_TYPE_UINT64);
+  g_value_set_uint64 (&value, client->bytes_sent);
+  result = g_value_array_append (result, &value);
+  g_value_unset (&value);
+
+  g_value_init (&value, G_TYPE_UINT64);
+  g_value_set_uint64 (&value, client->packets_sent);
+  result = g_value_array_append (result, &value);
+  g_value_unset (&value);
+
+  g_value_init (&value, G_TYPE_UINT64);
+  g_value_set_uint64 (&value, client->connect_time);
+  result = g_value_array_append (result, &value);
+  g_value_unset (&value);
+
+  g_value_init (&value, G_TYPE_UINT64);
+  g_value_set_uint64 (&value, client->disconnect_time);
+  result = g_value_array_append (result, &value);
+  g_value_unset (&value);
+
+  g_mutex_unlock (sink->client_lock);
+
+  return result;
+
+  /* ERRORS */
+not_found:
+  {
+    g_mutex_unlock (sink->client_lock);
+    GST_WARNING_OBJECT (sink, "client with host %s, port %d not found",
+        host, port);
+    /* Apparently (see comment in gstmultifdsink.c) returning NULL from here may
+     * confuse/break python bindings */
+    return g_value_array_new (0);
+  }
+}
+
+static GstStateChangeReturn
+gst_multiudpsink_change_state (GstElement * element, GstStateChange transition)
+{
+  GstStateChangeReturn ret;
+  GstMultiUDPSink *sink;
+
+  sink = GST_MULTIUDPSINK (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_READY_TO_PAUSED:
+      if (!gst_multiudpsink_init_send (sink))
+        goto no_init;
+      break;
+    default:
+      break;
+  }
+
+  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      gst_multiudpsink_close (sink);
+      break;
+    default:
+      break;
+  }
+  return ret;
+
+  /* ERRORS */
+no_init:
+  {
+    /* _init_send() posted specific error already */
+    return GST_STATE_CHANGE_FAILURE;
+  }
+}