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gstreamer/gst/rist/gstristsrc.c
Nicolas Dufresne 19c632f4e8 ristsrc: Add support for domain name 
This add domain name resolution (similar to udpsrc does) to the ristsrc
element.

Fixes 1352

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1433>
2020-07-14 20:48:04 +00:00

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/* GStreamer RIST plugin
* Copyright (C) 2019 Net Insight AB
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-ristsrc
* @title: ristsrc
* @see_also: ristsink
*
* This element implements RIST TR-06-1 Simple Profile receiver. The stream
* produced by this element will be RTP payloaded. This element also implements
* the URI scheme `rist://` allowing to render RIST streams in GStreamer based
* media players. The RIST URI handler also allows setting properties through
* the URI query.
*
* It also implements part of the RIST TR-06-2 Main Profile receiver. The
* tunneling, multiplexing and encryption parts of the specification are not
* included. This element will accept the RIST RTP header extension and restore
* the null MPEG-TS packets if the extension is included. It will not currently
* use the sequence number extension when sending RTCP NACK requests.
*
* ## Example gst-launch line
* |[
* gst-launch-1.0 ristsrc address=0.0.0.0 port=5004 ! rtpmp2tdepay ! udpsink
* gst-play-1.0 "rist://0.0.0.0:5004?receiver-buffer=700"
* ]|
*
* Additionally, this element supports link bonding, which means it
* can receive the same stream from multiple addresses. Each address
* will be mapped to its own RTP session. In order to enable bonding
* support, one need to configure the list of addresses through
* "bonding-addresses" properties.
*
* ## Example gst-launch line for bonding
* |[
* gst-launch-1.0 ristsrc bonding-addresses="10.0.0.1:5004,11.0.0.1:5006" ! rtpmp2tdepay ! udpsink
* gst-play-1.0 "rist://0.0.0.0:5004?bonding-addresses=10.0.0.1:5004,11.0.0.1:5006"
* ]|
*/
/* using GValueArray, which has not replacement */
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gio/gio.h>
#include <gst/net/net.h>
#include <gst/rtp/rtp.h>
/* for strtol() */
#include <stdlib.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include "gstrist.h"
GST_DEBUG_CATEGORY_STATIC (gst_rist_src_debug);
#define GST_CAT_DEFAULT gst_rist_src_debug
enum
{
PROP_ADDRESS = 1,
PROP_PORT,
PROP_RECEIVER_BUFFER,
PROP_REORDER_SECTION,
PROP_MAX_RTX_RETRIES,
PROP_MIN_RTCP_INTERVAL,
PROP_MAX_RTCP_BANDWIDTH,
PROP_STATS_UPDATE_INTERVAL,
PROP_STATS,
PROP_CNAME,
PROP_MULTICAST_LOOPBACK,
PROP_MULTICAST_IFACE,
PROP_MULTICAST_TTL,
PROP_BONDING_ADDRESSES
};
static GstStaticPadTemplate src_templ = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp"));
typedef struct
{
guint session;
gchar *address;
gchar *multicast_iface;
guint port;
GstElement *rtcp_src;
GstElement *rtp_src;
GstElement *rtcp_sink;
GstElement *rtx_receive;
gulong rtcp_recv_probe;
gulong rtcp_send_probe;
GSocketAddress *rtcp_send_addr;
} RistReceiverBond;
struct _GstRistSrc
{
GstBin parent;
GstUri *uri;
/* Common elements in the pipeline */
GstElement *rtpbin;
GstPad *srcpad;
GstElement *rtxbin;
GstElement *rtx_funnel;
GstElement *rtpdeext;
/* Common properties, protected by bonds_lock */
guint reorder_section;
guint max_rtx_retries;
GstClockTime min_rtcp_interval;
gdouble max_rtcp_bandwidth;
gint multicast_loopback;
gint multicast_ttl;
/* Bonds */
GPtrArray *bonds;
/* this is needed as setting sibling properties will try to take the object
* lock. Thus, any properties that affects the bonds will be protected with
* that lock instead of the object lock. */
GMutex bonds_lock;
/* For stats */
guint stats_interval;
guint32 rtp_ssrc;
GstClockID stats_cid;
GstElement *jitterbuffer;
/* This is set whenever there is a pipeline construction failure, and used
* to fail state changes later */
gboolean construct_failed;
const gchar *missing_plugin;
};
static void gst_rist_src_uri_init (gpointer g_iface, gpointer iface_data);
G_DEFINE_TYPE_WITH_CODE (GstRistSrc, gst_rist_src, GST_TYPE_BIN,
G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER, gst_rist_src_uri_init);
GST_DEBUG_CATEGORY_INIT (gst_rist_src_debug, "ristsrc", 0, "RIST Source"));
/* called with bonds lock */
static RistReceiverBond *
gst_rist_src_add_bond (GstRistSrc * src)
{
RistReceiverBond *bond = g_slice_new0 (RistReceiverBond);
GstPad *pad, *gpad;
gchar name[32];
bond->session = src->bonds->len;
bond->address = g_strdup ("0.0.0.0");
g_snprintf (name, 32, "rist_rtx_receive%u", bond->session);
bond->rtx_receive = gst_element_factory_make ("ristrtxreceive", name);
gst_bin_add (GST_BIN (src->rtxbin), bond->rtx_receive);
g_snprintf (name, 32, "sink_%u", bond->session);
gst_element_link_pads (bond->rtx_receive, "src", src->rtx_funnel, name);
g_snprintf (name, 32, "sink_%u", bond->session);
pad = gst_element_get_static_pad (bond->rtx_receive, "sink");
gpad = gst_ghost_pad_new (name, pad);
gst_object_unref (pad);
gst_element_add_pad (src->rtxbin, gpad);
g_snprintf (name, 32, "rist_rtp_udpsrc%u", bond->session);
bond->rtp_src = gst_element_factory_make ("udpsrc", name);
g_snprintf (name, 32, "rist_rtcp_udpsrc%u", bond->session);
bond->rtcp_src = gst_element_factory_make ("udpsrc", name);
g_snprintf (name, 32, "rist_rtcp_dynudpsink%u", bond->session);
bond->rtcp_sink = gst_element_factory_make ("dynudpsink", name);
if (!bond->rtp_src || !bond->rtcp_src || !bond->rtcp_sink) {
g_clear_object (&bond->rtp_src);
g_clear_object (&bond->rtcp_src);
g_clear_object (&bond->rtcp_sink);
g_slice_free (RistReceiverBond, bond);
src->missing_plugin = "udp";
return NULL;
}
gst_bin_add_many (GST_BIN (src), bond->rtp_src, bond->rtcp_src,
bond->rtcp_sink, NULL);
g_object_set (bond->rtcp_sink, "sync", FALSE, "async", FALSE, NULL);
gst_element_set_locked_state (bond->rtcp_sink, TRUE);
g_snprintf (name, 32, "recv_rtp_sink_%u", bond->session);
gst_element_link_pads (bond->rtp_src, "src", src->rtpbin, name);
g_snprintf (name, 32, "recv_rtcp_sink_%u", bond->session);
gst_element_link_pads (bond->rtcp_src, "src", src->rtpbin, name);
g_snprintf (name, 32, "send_rtcp_src_%u", bond->session);
gst_element_link_pads (src->rtpbin, name, bond->rtcp_sink, "sink");
g_ptr_array_add (src->bonds, bond);
return bond;
}
static void
gst_rist_src_pad_added (GstRistSrc * src, GstPad * new_pad, GstElement * rtpbin)
{
GST_TRACE_OBJECT (src, "New pad '%s'.", GST_PAD_NAME (new_pad));
if (g_str_has_prefix (GST_PAD_NAME (new_pad), "recv_rtp_src_0_")) {
GST_DEBUG_OBJECT (src, "Using new pad '%s' as ghost pad target.",
GST_PAD_NAME (new_pad));
gst_ghost_pad_set_target (GST_GHOST_PAD (src->srcpad), new_pad);
}
}
static GstCaps *
gst_rist_src_request_pt_map (GstRistSrc * src, guint session_id, guint pt,
GstElement * rtpbin)
{
const GstRTPPayloadInfo *pt_info;
GstCaps *ret;
pt_info = gst_rtp_payload_info_for_pt (pt);
if (!pt_info || !pt_info->clock_rate)
return NULL;
ret = gst_caps_new_simple ("application/x-rtp",
"media", G_TYPE_STRING, pt_info->media,
"encoding_name", G_TYPE_STRING, pt_info->encoding_name,
"clock-rate", G_TYPE_INT, (gint) pt_info->clock_rate, NULL);
/* FIXME add sprop-parameter-set if any */
g_warn_if_fail (pt_info->encoding_parameters == NULL);
return ret;
}
static GstElement *
gst_rist_src_request_aux_receiver (GstRistSrc * src, guint session_id,
GstElement * rtpbin)
{
return gst_object_ref (src->rtxbin);
}
/* Overrides the nack creation. Right now we don't send mixed NACKS type, we
* simply send a set of range NACK if it takes less space, or allow adding
* more seqnum. */
static guint
gst_rist_src_on_sending_nacks (GObject * session, guint sender_ssrc,
guint media_ssrc, GArray * nacks, GstBuffer * buffer, gpointer user_data)
{
GstRTCPBuffer rtcp = GST_RTCP_BUFFER_INIT;
GstRTCPPacket packet;
guint8 *app_data;
guint nacked_seqnums = 0;
guint range_size = 0;
guint n_rg_nacks = 0;
guint n_fb_nacks = 0;
guint16 seqnum;
guint i;
gint diff;
/* We'll assume that range will be best, and find how many generic NACK
* would have been created. If this number ends up being smaller, we will
* just remove the APP packet and return 0, leaving it to RTPSession to
* create the generic NACK.*/
gst_rtcp_buffer_map (buffer, GST_MAP_READWRITE, &rtcp);
if (!gst_rtcp_buffer_add_packet (&rtcp, GST_RTCP_TYPE_APP, &packet))
/* exit because the packet is full, will put next request in a
* further packet */
goto done;
gst_rtcp_packet_app_set_ssrc (&packet, media_ssrc);
gst_rtcp_packet_app_set_name (&packet, "RIST");
if (!gst_rtcp_packet_app_set_data_length (&packet, 1)) {
gst_rtcp_packet_remove (&packet);
GST_WARNING ("no range nacks fit in the packet");
goto done;
}
app_data = gst_rtcp_packet_app_get_data (&packet);
for (i = 0; i < nacks->len; i = nacked_seqnums) {
guint j;
seqnum = g_array_index (nacks, guint16, i);
if (!gst_rtcp_packet_app_set_data_length (&packet, n_rg_nacks + 1))
break;
n_rg_nacks++;
nacked_seqnums++;
for (j = i + 1; j < nacks->len; j++) {
guint16 next_seqnum = g_array_index (nacks, guint16, j);
diff = gst_rtp_buffer_compare_seqnum (seqnum, next_seqnum);
GST_TRACE ("[%u][%u] %u %u diff %i", i, j, seqnum, next_seqnum, diff);
if (diff > (j - i))
break;
nacked_seqnums++;
}
range_size = j - i - 1;
GST_WRITE_UINT32_BE (app_data, seqnum << 16 | range_size);
app_data += 4;
}
/* count how many FB NACK it would take to wrap nacked_seqnums */
seqnum = g_array_index (nacks, guint16, 0);
n_fb_nacks = 1;
for (i = 1; i < nacked_seqnums; i++) {
guint16 next_seqnum = g_array_index (nacks, guint16, i);
diff = gst_rtp_buffer_compare_seqnum (seqnum, next_seqnum);
if (diff > 16) {
n_fb_nacks++;
seqnum = next_seqnum;
}
}
if (n_fb_nacks <= n_rg_nacks) {
GST_DEBUG ("Not sending %u range nacks, as %u FB nacks will be smaller",
n_rg_nacks, n_fb_nacks);
gst_rtcp_packet_remove (&packet);
nacked_seqnums = 0;
goto done;
}
GST_DEBUG ("Sent %u seqnums into %u Range NACKs", nacked_seqnums, n_rg_nacks);
done:
gst_rtcp_buffer_unmap (&rtcp);
return nacked_seqnums;
}
static void
gst_rist_src_on_new_ssrc (GstRistSrc * src, guint session_id, guint ssrc,
GstElement * rtpbin)
{
GObject *session = NULL;
GObject *source = NULL;
g_signal_emit_by_name (rtpbin, "get-internal-session", session_id, &session);
g_signal_emit_by_name (session, "get-source-by-ssrc", ssrc, &source);
if (ssrc & 1) {
GST_DEBUG ("Disabling RTCP and probation on RTX stream "
"(SSRC %u on session %u)", ssrc, session_id);
g_object_set (source, "disable-rtcp", TRUE, "probation", 0, NULL);
} else {
g_signal_connect (session, "on-sending-nacks",
(GCallback) gst_rist_src_on_sending_nacks, NULL);
}
g_object_unref (source);
g_object_unref (session);
}
static void
gst_rist_src_new_jitterbuffer (GstRistSrc * src, GstElement * jitterbuffer,
guint session, guint ssrc, GstElement * rtpbin)
{
if (session != 0) {
GST_WARNING_OBJECT (rtpbin, "Unexpected jitterbuffer created.");
return;
}
g_object_set (jitterbuffer, "rtx-delay", src->reorder_section,
"rtx-max-retries", src->max_rtx_retries, NULL);
if ((ssrc & 1) == 0) {
GST_INFO_OBJECT (src, "Saving jitterbuffer for session %u ssrc %u",
session, ssrc);
g_clear_object (&src->jitterbuffer);
src->jitterbuffer = gst_object_ref (jitterbuffer);
src->rtp_ssrc = ssrc;
}
}
static void
gst_rist_src_init (GstRistSrc * src)
{
GstPad *pad, *gpad;
GstStructure *sdes = NULL;
RistReceiverBond *bond;
g_mutex_init (&src->bonds_lock);
src->bonds = g_ptr_array_new ();
/* Construct the RIST RTP receiver pipeline.
*
* udpsrc -> [recv_rtp_sink_%u] -------- [recv_rtp_src_%u_%u_%u]
* | rtpbin |
* udpsrc -> [recv_rtcp_sink_%u] -------- [send_rtcp_src_%u] -> udpsink
*
* This pipeline is fixed for now, note that optionally an FEC stream could
* be added later.
*/
src->srcpad = gst_ghost_pad_new_no_target_from_template ("src",
gst_static_pad_template_get (&src_templ));
gst_element_add_pad (GST_ELEMENT (src), src->srcpad);
src->rtpbin = gst_element_factory_make ("rtpbin", "rist_recv_rtpbin");
if (!src->rtpbin) {
src->missing_plugin = "rtpmanager";
goto missing_plugin;
}
/* RIST specification says the SDES should only contain the CNAME */
g_object_get (src->rtpbin, "sdes", &sdes, NULL);
gst_structure_remove_field (sdes, "tool");
gst_bin_add (GST_BIN (src), src->rtpbin);
g_object_set (src->rtpbin, "do-retransmission", TRUE,
"rtp-profile", 3 /* AVPF */ ,
"sdes", sdes, NULL);
gst_structure_free (sdes);
g_signal_connect_object (src->rtpbin, "request-pt-map",
G_CALLBACK (gst_rist_src_request_pt_map), src, G_CONNECT_SWAPPED);
g_signal_connect_object (src->rtpbin, "request-aux-receiver",
G_CALLBACK (gst_rist_src_request_aux_receiver), src, G_CONNECT_SWAPPED);
src->rtxbin = gst_bin_new ("rist_recv_rtxbin");
g_object_ref_sink (src->rtxbin);
src->rtx_funnel = gst_element_factory_make ("funnel", "rist_rtx_funnel");
gst_bin_add (GST_BIN (src->rtxbin), src->rtx_funnel);
src->rtpdeext = gst_element_factory_make ("ristrtpdeext", "rist_rtp_de_ext");
gst_bin_add (GST_BIN (src->rtxbin), src->rtpdeext);
gst_element_link (src->rtx_funnel, src->rtpdeext);
pad = gst_element_get_static_pad (src->rtpdeext, "src");
gpad = gst_ghost_pad_new ("src_0", pad);
gst_object_unref (pad);
gst_element_add_pad (src->rtxbin, gpad);
g_signal_connect_object (src->rtpbin, "pad-added",
G_CALLBACK (gst_rist_src_pad_added), src, G_CONNECT_SWAPPED);
g_signal_connect_object (src->rtpbin, "on-new-ssrc",
G_CALLBACK (gst_rist_src_on_new_ssrc), src, G_CONNECT_SWAPPED);
g_signal_connect_object (src->rtpbin, "new-jitterbuffer",
G_CALLBACK (gst_rist_src_new_jitterbuffer), src, G_CONNECT_SWAPPED);
bond = gst_rist_src_add_bond (src);
if (!bond)
goto missing_plugin;
return;
missing_plugin:
{
GST_ERROR_OBJECT (src, "'%s' plugin is missing.", src->missing_plugin);
src->construct_failed = TRUE;
}
}
static GstPadProbeReturn
gst_rist_src_on_recv_rtcp (GstPad * pad, GstPadProbeInfo * info,
gpointer user_data)
{
GstRistSrc *src = GST_RIST_SRC (user_data);
GstBuffer *buffer;
GstNetAddressMeta *meta;
GstElement *rtcp_src;
RistReceiverBond *bond = NULL;
gint i;
rtcp_src = GST_ELEMENT (gst_pad_get_parent (pad));
g_mutex_lock (&src->bonds_lock);
for (i = 0; i < src->bonds->len; i++) {
RistReceiverBond *b = g_ptr_array_index (src->bonds, i);
if (b->rtcp_src == rtcp_src) {
bond = b;
break;
}
}
gst_object_unref (rtcp_src);
if (!bond) {
GST_WARNING_OBJECT (src, "Unexpected RTCP source.");
g_mutex_unlock (&src->bonds_lock);
return GST_PAD_PROBE_OK;
}
if (info->type == GST_PAD_PROBE_TYPE_BUFFER_LIST) {
GstBufferList *buffer_list = info->data;
buffer = gst_buffer_list_get (buffer_list, 0);
} else {
buffer = info->data;
}
meta = gst_buffer_get_net_address_meta (buffer);
g_clear_object (&bond->rtcp_send_addr);
bond->rtcp_send_addr = g_object_ref (meta->addr);
g_mutex_unlock (&src->bonds_lock);
return GST_PAD_PROBE_OK;
}
/* called with bonds lock */
static inline void
gst_rist_src_attach_net_address_meta (RistReceiverBond * bond,
GstBuffer * buffer)
{
if (bond->rtcp_send_addr)
gst_buffer_add_net_address_meta (buffer, bond->rtcp_send_addr);
}
static GstPadProbeReturn
gst_rist_src_on_send_rtcp (GstPad * pad, GstPadProbeInfo * info,
gpointer user_data)
{
GstRistSrc *src = GST_RIST_SRC (user_data);
GstElement *rtcp_sink;
RistReceiverBond *bond = NULL;
gint i;
rtcp_sink = GST_ELEMENT (gst_pad_get_parent (pad));
g_mutex_lock (&src->bonds_lock);
for (i = 0; i < src->bonds->len; i++) {
RistReceiverBond *b = g_ptr_array_index (src->bonds, i);
if (b->rtcp_sink == rtcp_sink) {
bond = b;
break;
}
}
gst_object_unref (rtcp_sink);
if (!bond) {
GST_WARNING_OBJECT (src, "Unexpected RTCP sink.");
g_mutex_unlock (&src->bonds_lock);
return GST_PAD_PROBE_OK;
}
if (info->type == GST_PAD_PROBE_TYPE_BUFFER_LIST) {
GstBufferList *buffer_list = info->data;
GstBuffer *buffer;
gint i;
info->data = buffer_list = gst_buffer_list_make_writable (buffer_list);
for (i = 0; i < gst_buffer_list_length (buffer_list); i++) {
buffer = gst_buffer_list_get (buffer_list, i);
gst_rist_src_attach_net_address_meta (bond, buffer);
}
} else {
GstBuffer *buffer = info->data;
info->data = buffer = gst_buffer_make_writable (buffer);
gst_rist_src_attach_net_address_meta (bond, buffer);
}
g_mutex_unlock (&src->bonds_lock);
return GST_PAD_PROBE_OK;
}
static gboolean
gst_rist_src_setup_rtcp_socket (GstRistSrc * src, RistReceiverBond * bond)
{
GstPad *pad;
GSocket *socket = NULL;
GInetAddress *iaddr = NULL;
guint port = bond->port + 1;
GError *error = NULL;
g_object_get (bond->rtcp_src, "used-socket", &socket, NULL);
if (!socket)
return GST_STATE_CHANGE_FAILURE;
iaddr = g_inet_address_new_from_string (bond->address);
if (!iaddr) {
GList *results;
GResolver *resolver = NULL;
resolver = g_resolver_get_default ();
results = g_resolver_lookup_by_name (resolver, bond->address, NULL, &error);
if (!results) {
g_object_unref (resolver);
goto dns_resolve_failed;
}
iaddr = G_INET_ADDRESS (g_object_ref (results->data));
g_resolver_free_addresses (results);
g_object_unref (resolver);
}
if (g_inet_address_get_is_multicast (iaddr)) {
/* mc-ttl is not supported by dynudpsink */
g_socket_set_multicast_ttl (socket, src->multicast_ttl);
/* In multicast, send RTCP to the multicast group */
bond->rtcp_send_addr = g_inet_socket_address_new (iaddr, port);
} else {
/* In unicast, send RTCP to the detected sender address */
pad = gst_element_get_static_pad (bond->rtcp_src, "src");
bond->rtcp_recv_probe = gst_pad_add_probe (pad,
GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_BUFFER_LIST,
gst_rist_src_on_recv_rtcp, src, NULL);
gst_object_unref (pad);
}
g_object_unref (iaddr);
pad = gst_element_get_static_pad (bond->rtcp_sink, "sink");
bond->rtcp_send_probe = gst_pad_add_probe (pad,
GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_BUFFER_LIST,
gst_rist_src_on_send_rtcp, src, NULL);
gst_object_unref (pad);
if (bond->multicast_iface) {
#ifdef SO_BINDTODEVICE
if (setsockopt (g_socket_get_fd (socket), SOL_SOCKET,
SO_BINDTODEVICE, bond->multicast_iface,
strlen (bond->multicast_iface)) < 0)
GST_WARNING_OBJECT (src, "setsockopt SO_BINDTODEVICE failed: %s",
strerror (errno));
#else
GST_WARNING_OBJECT (src, "Tried to set a multicast interface while"
" GStreamer was compiled on a platform without SO_BINDTODEVICE");
#endif
}
/* share the socket created by the source */
g_object_set (bond->rtcp_sink, "socket", socket, "close-socket", FALSE, NULL);
g_object_unref (socket);
gst_element_set_locked_state (bond->rtcp_sink, FALSE);
gst_element_sync_state_with_parent (bond->rtcp_sink);
return GST_STATE_CHANGE_SUCCESS;
dns_resolve_failed:
GST_ELEMENT_ERROR (src, RESOURCE, NOT_FOUND,
("Could not resolve hostname '%s'", GST_STR_NULL (bond->address)),
("DNS resolver reported: %s", error->message));
g_error_free (error);
return GST_STATE_CHANGE_FAILURE;
}
static GstStateChangeReturn
gst_rist_src_start (GstRistSrc * src)
{
gint i;
if (src->construct_failed) {
GST_ELEMENT_ERROR (src, CORE, MISSING_PLUGIN,
("Your GStreamer installation is missing plugin '%s'",
src->missing_plugin), (NULL));
return GST_STATE_CHANGE_FAILURE;
}
for (i = 0; i < src->bonds->len; i++) {
RistReceiverBond *bond = g_ptr_array_index (src->bonds, i);
GObject *session = NULL;
g_signal_emit_by_name (src->rtpbin, "get-session", i, &session);
g_object_set (session, "rtcp-min-interval", src->min_rtcp_interval,
"rtcp-fraction", src->max_rtcp_bandwidth, NULL);
g_object_unref (session);
if (!gst_rist_src_setup_rtcp_socket (src, bond))
return GST_STATE_CHANGE_FAILURE;
}
return GST_STATE_CHANGE_SUCCESS;
}
static GstStructure *
gst_rist_src_create_stats (GstRistSrc * src)
{
GstStructure *ret;
GValueArray *session_stats;
guint64 total_dropped = 0, total_received = 0, recovered = 0, lost = 0;
guint64 duplicates = 0, rtx_sent = 0, rtt = 0;
gint i;
ret = gst_structure_new_empty ("rist/x-receiver-stats");
session_stats = g_value_array_new (src->bonds->len);
for (i = 0; i < src->bonds->len; i++) {
GObject *session = NULL, *source = NULL;
GstStructure *sstats = NULL, *stats;
const gchar *rtp_from = NULL, *rtcp_from = NULL;
guint64 dropped = 0, received = 0;
GValue value = G_VALUE_INIT;
g_signal_emit_by_name (src->rtpbin, "get-internal-session", i, &session);
if (!session)
continue;
stats = gst_structure_new_empty ("rist/x-receiver-session-stats");
g_signal_emit_by_name (session, "get-source-by-ssrc", src->rtp_ssrc,
&source);
if (source) {
gint packet_lost;
g_object_get (source, "stats", &sstats, NULL);
gst_structure_get_int (sstats, "packets-lost", &packet_lost);
dropped = MAX (packet_lost, 0);
gst_structure_get_uint64 (sstats, "packets-received", &received);
rtp_from = gst_structure_get_string (sstats, "rtp-from");
rtcp_from = gst_structure_get_string (sstats, "rtcp-from");
}
g_object_unref (session);
gst_structure_set (stats, "session-id", G_TYPE_INT, i,
"rtp-from", G_TYPE_STRING, rtp_from ? rtp_from : "",
"rtcp-from", G_TYPE_STRING, rtcp_from ? rtcp_from : "",
"dropped", G_TYPE_UINT64, MAX (dropped, 0),
"received", G_TYPE_UINT64, received, NULL);
if (sstats)
gst_structure_free (sstats);
g_clear_object (&source);
g_value_init (&value, GST_TYPE_STRUCTURE);
g_value_take_boxed (&value, stats);
g_value_array_append (session_stats, &value);
g_value_unset (&value);
total_dropped += dropped;
}
if (src->jitterbuffer) {
GstStructure *stats;
g_object_get (src->jitterbuffer, "stats", &stats, NULL);
gst_structure_get (stats,
"num-pushed", G_TYPE_UINT64, &total_received,
"num-lost", G_TYPE_UINT64, &lost,
"rtx-count", G_TYPE_UINT64, &rtx_sent,
"num-duplicates", G_TYPE_UINT64, &duplicates,
"rtx-success-count", G_TYPE_UINT64, &recovered,
"rtx-rtt", G_TYPE_UINT64, &rtt, NULL);
gst_structure_free (stats);
}
gst_structure_set (ret, "dropped", G_TYPE_UINT64, total_dropped,
"received", G_TYPE_UINT64, total_received,
"recovered", G_TYPE_UINT64, recovered,
"permanently-lost", G_TYPE_UINT64, lost,
"duplicates", G_TYPE_UINT64, duplicates,
"retransmission-requests-sent", G_TYPE_UINT64, rtx_sent,
"rtx-roundtrip-time", G_TYPE_UINT64, rtt,
"session-stats", G_TYPE_VALUE_ARRAY, session_stats, NULL);
g_value_array_free (session_stats);
return ret;
}
static gboolean
gst_rist_src_dump_stats (GstClock * clock, GstClockTime time, GstClockID id,
gpointer user_data)
{
GstRistSrc *src = GST_RIST_SRC (user_data);
GstStructure *stats = gst_rist_src_create_stats (src);
gst_println ("%s: %" GST_PTR_FORMAT, GST_OBJECT_NAME (src), stats);
gst_structure_free (stats);
return TRUE;
}
static void
gst_rist_src_enable_stats_interval (GstRistSrc * src)
{
GstClock *clock;
GstClockTime start, interval;
if (src->stats_interval == 0)
return;
interval = src->stats_interval * GST_MSECOND;
clock = gst_system_clock_obtain ();
start = gst_clock_get_time (clock) + interval;
src->stats_cid = gst_clock_new_periodic_id (clock, start, interval);
gst_clock_id_wait_async (src->stats_cid, gst_rist_src_dump_stats,
gst_object_ref (src), (GDestroyNotify) gst_object_unref);
gst_object_unref (clock);
}
static void
gst_rist_src_disable_stats_interval (GstRistSrc * src)
{
if (src->stats_cid) {
gst_clock_id_unschedule (src->stats_cid);
gst_clock_id_unref (src->stats_cid);
src->stats_cid = NULL;
}
}
static void
gst_rist_src_stop (GstRistSrc * src)
{
GstPad *pad;
gint i;
for (i = 0; i < src->bonds->len; i++) {
RistReceiverBond *bond = g_ptr_array_index (src->bonds, i);
if (bond->rtcp_recv_probe) {
pad = gst_element_get_static_pad (bond->rtcp_src, "src");
gst_pad_remove_probe (pad, bond->rtcp_recv_probe);
bond->rtcp_recv_probe = 0;
gst_object_unref (pad);
}
if (bond->rtcp_send_probe) {
pad = gst_element_get_static_pad (bond->rtcp_sink, "sink");
gst_pad_remove_probe (pad, bond->rtcp_send_probe);
bond->rtcp_send_probe = 0;
gst_object_unref (pad);
}
}
}
static GstStateChangeReturn
gst_rist_src_change_state (GstElement * element, GstStateChange transition)
{
GstRistSrc *src = GST_RIST_SRC (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_rist_src_disable_stats_interval (src);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (gst_rist_src_parent_class)->change_state (element,
transition);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
gst_rist_src_start (src);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_rist_src_enable_stats_interval (src);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
gst_rist_src_stop (src);
break;
default:
break;
}
return ret;
}
/* called with bonds lock */
static void
gst_rist_src_update_bond_address (GstRistSrc * src, RistReceiverBond * bond,
const gchar * address, guint port, const gchar * multicast_iface)
{
g_free (bond->address);
g_free (bond->multicast_iface);
bond->address = g_strdup (address);
bond->multicast_iface = multicast_iface ? g_strdup (multicast_iface) : NULL;
bond->port = port;
g_object_set (G_OBJECT (bond->rtp_src), "address", address, "port", port,
"multicast-iface", bond->multicast_iface, NULL);
g_object_set (G_OBJECT (bond->rtcp_src), "address", address,
"port", port + 1, "multicast-iface", bond->multicast_iface, NULL);
/* TODO add runtime support
* - add blocking the pad probe
* - update RTCP socket
* - cycle elements through NULL state
*/
}
/* called with bonds lock */
static gchar *
gst_rist_src_get_bonds (GstRistSrc * src)
{
GString *bonds = g_string_new ("");
gint i;
for (i = 0; i < src->bonds->len; i++) {
RistReceiverBond *bond = g_ptr_array_index (src->bonds, i);
if (bonds->len > 0)
g_string_append_c (bonds, ':');
g_string_append_printf (bonds, "%s:%u", bond->address, bond->port);
if (bond->multicast_iface)
g_string_append_printf (bonds, "/%s", bond->multicast_iface);
}
return g_string_free (bonds, FALSE);
}
struct RistAddress
{
gchar *address;
char *multicast_iface;
guint port;
};
/* called with bonds lock */
static void
gst_rist_src_set_bonds (GstRistSrc * src, const gchar * bonds)
{
GStrv tokens = NULL;
struct RistAddress *addrs;
gint i;
if (bonds == NULL)
goto missing_address;
tokens = g_strsplit (bonds, ",", 0);
if (tokens[0] == NULL)
goto missing_address;
addrs = g_new0 (struct RistAddress, g_strv_length (tokens));
/* parse the address list */
for (i = 0; tokens[i]; i++) {
gchar *address = tokens[i];
char *port_ptr, *iface_ptr, *endptr;
guint port;
port_ptr = g_utf8_strrchr (address, -1, ':');
iface_ptr = g_utf8_strrchr (address, -1, '/');
if (!port_ptr)
goto bad_parameter;
if (!g_ascii_isdigit (port_ptr[1]))
goto bad_parameter;
if (iface_ptr) {
if (iface_ptr < port_ptr)
goto bad_parameter;
iface_ptr[0] = '\0';
}
port = strtol (port_ptr + 1, &endptr, 0);
if (endptr[0] != '\0')
goto bad_parameter;
/* port must be a multiple of 2 between 2 and 65534 */
if (port < 2 || (port & 1) || port > G_MAXUINT16)
goto invalid_port;
port_ptr[0] = '\0';
addrs[i].port = port;
addrs[i].address = g_strstrip (address);
if (iface_ptr)
addrs[i].multicast_iface = g_strstrip (iface_ptr + 1);
}
/* configure the bonds */
for (i = 0; tokens[i]; i++) {
RistReceiverBond *bond = NULL;
if (i < src->bonds->len)
bond = g_ptr_array_index (src->bonds, i);
else
bond = gst_rist_src_add_bond (src);
gst_rist_src_update_bond_address (src, bond, addrs[i].address,
addrs[i].port, addrs[i].multicast_iface);
}
g_strfreev (tokens);
return;
missing_address:
g_warning ("'bonding-addresses' cannot be empty");
g_strfreev (tokens);
return;
bad_parameter:
g_warning ("Failed to parse address '%s", tokens[i]);
g_strfreev (tokens);
g_free (addrs);
return;
invalid_port:
g_warning ("RIST port must valid UDP port and a multiple of 2.");
g_strfreev (tokens);
g_free (addrs);
return;
}
static void
gst_rist_src_set_multicast_loopback (GstRistSrc * src, gboolean loop)
{
gint i;
src->multicast_loopback = loop;
for (i = 0; i < src->bonds->len; i++) {
RistReceiverBond *bond = g_ptr_array_index (src->bonds, i);
g_object_set (G_OBJECT (bond->rtp_src), "loop", loop, NULL);
g_object_set (G_OBJECT (bond->rtcp_src), "loop", loop, NULL);
}
}
static void
gst_rist_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRistSrc *src = GST_RIST_SRC (object);
GstStructure *sdes;
RistReceiverBond *bond;
if (src->construct_failed)
return;
g_mutex_lock (&src->bonds_lock);
bond = g_ptr_array_index (src->bonds, 0);
switch (prop_id) {
case PROP_ADDRESS:
g_value_set_string (value, bond->address);
break;
case PROP_PORT:
g_value_set_uint (value, bond->port);
break;
case PROP_RECEIVER_BUFFER:
g_object_get_property (G_OBJECT (src->rtpbin), "latency", value);
break;
case PROP_REORDER_SECTION:
g_value_set_uint (value, src->reorder_section);
break;
case PROP_MAX_RTX_RETRIES:
g_value_set_uint (value, src->max_rtx_retries);
break;
case PROP_MIN_RTCP_INTERVAL:
g_value_set_uint (value, (guint) (src->min_rtcp_interval / GST_MSECOND));
break;
case PROP_MAX_RTCP_BANDWIDTH:
g_value_set_double (value, src->max_rtcp_bandwidth);
break;
case PROP_STATS_UPDATE_INTERVAL:
g_value_set_uint (value, src->stats_interval);
break;
case PROP_STATS:
g_value_take_boxed (value, gst_rist_src_create_stats (src));
break;
case PROP_CNAME:
g_object_get (src->rtpbin, "sdes", &sdes, NULL);
g_value_set_string (value, gst_structure_get_string (sdes, "cname"));
gst_structure_free (sdes);
break;
case PROP_MULTICAST_LOOPBACK:
g_value_set_boolean (value, src->multicast_loopback);
break;
case PROP_MULTICAST_IFACE:
g_value_set_string (value, bond->multicast_iface);
break;
case PROP_MULTICAST_TTL:
g_value_set_int (value, src->multicast_ttl);
break;
case PROP_BONDING_ADDRESSES:
g_value_take_string (value, gst_rist_src_get_bonds (src));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
g_mutex_unlock (&src->bonds_lock);
}
static void
gst_rist_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRistSrc *src = GST_RIST_SRC (object);
GstStructure *sdes;
RistReceiverBond *bond;
if (src->construct_failed)
return;
g_mutex_lock (&src->bonds_lock);
bond = g_ptr_array_index (src->bonds, 0);
switch (prop_id) {
case PROP_ADDRESS:
g_free (bond->address);
bond->address = g_value_dup_string (value);
g_object_set_property (G_OBJECT (bond->rtp_src), "address", value);
g_object_set_property (G_OBJECT (bond->rtcp_src), "address", value);
break;
case PROP_PORT:{
guint port = g_value_get_uint (value);
/* According to 5.1.1, RTP receiver port most be even number and RTCP
* port should be the RTP port + 1 */
if (port & 0x1) {
g_warning ("Invalid RIST port %u, should be an even number.", port);
return;
}
bond->port = port;
g_object_set (bond->rtp_src, "port", port, NULL);
g_object_set (bond->rtcp_src, "port", port + 1, NULL);
break;
}
case PROP_RECEIVER_BUFFER:
g_object_set (src->rtpbin, "latency", g_value_get_uint (value), NULL);
break;
case PROP_REORDER_SECTION:
src->reorder_section = g_value_get_uint (value);
break;
case PROP_MAX_RTX_RETRIES:
src->max_rtx_retries = g_value_get_uint (value);
break;
case PROP_MIN_RTCP_INTERVAL:
src->min_rtcp_interval = g_value_get_uint (value) * GST_MSECOND;
break;
case PROP_MAX_RTCP_BANDWIDTH:
src->max_rtcp_bandwidth = g_value_get_double (value);
break;
case PROP_STATS_UPDATE_INTERVAL:
src->stats_interval = g_value_get_uint (value);
break;
case PROP_CNAME:
g_object_get (src->rtpbin, "sdes", &sdes, NULL);
gst_structure_set_value (sdes, "cname", value);
g_object_set (src->rtpbin, "sdes", sdes, NULL);
gst_structure_free (sdes);
break;
case PROP_MULTICAST_LOOPBACK:
gst_rist_src_set_multicast_loopback (src, g_value_get_boolean (value));
break;
case PROP_MULTICAST_IFACE:
g_free (bond->multicast_iface);
bond->multicast_iface = g_value_dup_string (value);
g_object_set_property (G_OBJECT (bond->rtp_src),
"multicast-iface", value);
g_object_set_property (G_OBJECT (bond->rtcp_src),
"multicast-iface", value);
break;
case PROP_MULTICAST_TTL:
src->multicast_ttl = g_value_get_int (value);
break;
case PROP_BONDING_ADDRESSES:
gst_rist_src_set_bonds (src, g_value_get_string (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
g_mutex_unlock (&src->bonds_lock);
}
static void
gst_rist_src_finalize (GObject * object)
{
GstRistSrc *src = GST_RIST_SRC (object);
gint i;
g_mutex_lock (&src->bonds_lock);
for (i = 0; i < src->bonds->len; i++) {
RistReceiverBond *bond = g_ptr_array_index (src->bonds, i);
g_free (bond->address);
g_free (bond->multicast_iface);
g_slice_free (RistReceiverBond, bond);
}
g_ptr_array_free (src->bonds, TRUE);
g_clear_object (&src->jitterbuffer);
g_clear_object (&src->rtxbin);
g_mutex_unlock (&src->bonds_lock);
g_mutex_clear (&src->bonds_lock);
G_OBJECT_CLASS (gst_rist_src_parent_class)->finalize (object);
}
static void
gst_rist_src_class_init (GstRistSrcClass * klass)
{
GstElementClass *element_class = (GstElementClass *) klass;
GObjectClass *object_class = (GObjectClass *) klass;
gst_element_class_set_metadata (element_class,
"RIST Source", "Source/Network",
"Source that implements RIST TR-06-1 streaming specification",
"Nicolas Dufresne <nicolas.dufresne@collabora.com");
gst_element_class_add_static_pad_template (element_class, &src_templ);
element_class->change_state = gst_rist_src_change_state;
object_class->get_property = gst_rist_src_get_property;
object_class->set_property = gst_rist_src_set_property;
object_class->finalize = gst_rist_src_finalize;
g_object_class_install_property (object_class, PROP_ADDRESS,
g_param_spec_string ("address", "Address",
"Address to receive packets from (can be IPv4 or IPv6).", "0.0.0.0",
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class, PROP_PORT,
g_param_spec_uint ("port", "Port", "The port to listen for RTP packets, "
"the RTCP port is this value + 1. This port must be an even number.",
2, 65534, 5004,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_RECEIVER_BUFFER,
g_param_spec_uint ("receiver-buffer", "Receiver Buffer",
"Buffering duration (in ms)", 0, G_MAXUINT, 1000,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_REORDER_SECTION,
g_param_spec_uint ("reorder-section", "Recorder Section",
"Time to wait before sending retransmission request (in ms)",
0, G_MAXUINT, 70,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_MAX_RTX_RETRIES,
g_param_spec_uint ("max-rtx-retries", "Maximum Retransmission Retries",
"The maximum number of retransmission requests for a lost packet.",
0, G_MAXUINT, 7,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_MIN_RTCP_INTERVAL,
g_param_spec_uint ("min-rtcp-interval", "Minimum RTCP Intercal",
"The minimum interval (in ms) between two successive RTCP packets",
0, 100, 100,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_MAX_RTCP_BANDWIDTH,
g_param_spec_double ("max-rtcp-bandwidth", "Maximum RTCP Bandwidth",
"The maximum bandwidth used for RTCP as a fraction of RTP bandwdith",
0.0, 0.05, 0.05,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_STATS_UPDATE_INTERVAL,
g_param_spec_uint ("stats-update-interval", "Statistics Update Interval",
"The interval between 'stats' update notification (in ms) (0 disabled)",
0, G_MAXUINT, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_STATS,
g_param_spec_boxed ("stats", "Statistics",
"Statistic in a GstStructure named 'rist/x-receiver-stats'",
GST_TYPE_STRUCTURE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class, PROP_CNAME,
g_param_spec_string ("cname", "CName",
"Set the CNAME in the SDES block of the receiver report.", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_DOC_SHOW_DEFAULT));
g_object_class_install_property (object_class, PROP_MULTICAST_LOOPBACK,
g_param_spec_boolean ("multicast-loopback", "Multicast Loopback",
"When enabled, the packets will be received locally.", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_MULTICAST_IFACE,
g_param_spec_string ("multicast-iface", "multicast-iface",
"The multicast interface to use to send packets.", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class, PROP_MULTICAST_TTL,
g_param_spec_int ("multicast-ttl", "Multicast TTL",
"The multicast time-to-live parameter.", 0, 255, 1,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_BONDING_ADDRESSES,
g_param_spec_string ("bonding-addresses", "Bonding Addresses",
"Comma (,) separated list of <address>:<port> to receive from. "
"Only used if 'enable-bonding' is set.", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static GstURIType
gst_rist_src_uri_get_type (GType type)
{
return GST_URI_SRC;
}
static const gchar *const *
gst_rist_src_uri_get_protocols (GType type)
{
static const char *protocols[] = { "rist", NULL };
return protocols;
}
static gchar *
gst_rist_src_uri_get_uri (GstURIHandler * handler)
{
GstRistSrc *src = GST_RIST_SRC (handler);
gchar *uri = NULL;
GST_OBJECT_LOCK (src);
if (src->uri)
uri = gst_uri_to_string (src->uri);
GST_OBJECT_UNLOCK (src);
return uri;
}
static void
gst_rist_src_uri_query_foreach (const gchar * key, const gchar * value,
GObject * src)
{
if (g_str_equal (key, "async-handling")) {
GST_WARNING_OBJECT (src, "Setting '%s' property from URI is not allowed.",
key);
return;
}
GST_DEBUG_OBJECT (src, "Setting property '%s' to '%s'", key, value);
gst_util_set_object_arg (src, key, value);
}
static gboolean
gst_rist_src_uri_set_uri (GstURIHandler * handler, const gchar * uri,
GError ** error)
{
GstRistSrc *src = GST_RIST_SRC (handler);
GstUri *gsturi;
GHashTable *query_table;
if (GST_STATE (src) >= GST_STATE_PAUSED) {
g_set_error (error, GST_URI_ERROR, GST_URI_ERROR_BAD_STATE,
"Changing the URI on ristsrc when it is running is not supported");
GST_ERROR_OBJECT (src, "%s", (*error)->message);
return FALSE;
}
if (!(gsturi = gst_uri_from_string (uri))) {
g_set_error (error, GST_URI_ERROR, GST_URI_ERROR_BAD_URI,
"Could not parse URI");
GST_ERROR_OBJECT (src, "%s", (*error)->message);
gst_uri_unref (gsturi);
return FALSE;
}
GST_OBJECT_LOCK (src);
if (src->uri)
gst_uri_unref (src->uri);
src->uri = gst_uri_ref (gsturi);
GST_OBJECT_UNLOCK (src);
g_object_set (src, "address", gst_uri_get_host (gsturi), NULL);
if (gst_uri_get_port (gsturi))
g_object_set (src, "port", gst_uri_get_port (gsturi), NULL);
query_table = gst_uri_get_query_table (gsturi);
if (query_table)
g_hash_table_foreach (query_table,
(GHFunc) gst_rist_src_uri_query_foreach, src);
gst_uri_unref (gsturi);
return TRUE;
}
static void
gst_rist_src_uri_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
iface->get_type = gst_rist_src_uri_get_type;
iface->get_protocols = gst_rist_src_uri_get_protocols;
iface->get_uri = gst_rist_src_uri_get_uri;
iface->set_uri = gst_rist_src_uri_set_uri;
}
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