gstreamer/gst/rtp/gstrtpsrc.c
2020-02-21 12:16:17 +01:00

808 lines
25 KiB
C

/* GStreamer
* Copyright (C) <2018> Marc Leeman <marc.leeman@gmail.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: gstrtpsrc
* @title: GstRtpSrc
* @short description: element with Uri interface to get RTP data from
* the network.
*
* RTP (RFC 3550) is a protocol to stream media over the network while
* retaining the timing information and providing enough information to
* reconstruct the correct timing domain by the receiver.
*
* The RTP data port should be even, while the RTCP port should be
* odd. The URI that is entered defines the data port, the RTCP port will
* be allocated to the next port.
*
* This element hooks up the correct sockets to support both RTP as the
* accompanying RTCP layer.
*
* This Bin handles taking in of data from the network and provides the
* RTP payloaded data.
*
* This element also implements the URI scheme `rtp://` allowing to render
* RTP streams in GStreamer based media players. The RTP URI handler also
* allows setting properties through the URI query.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gst/net/net.h>
#include <gst/rtp/gstrtppayloads.h>
#include "gstrtpsrc.h"
#include "gstrtp-utils.h"
GST_DEBUG_CATEGORY_STATIC (gst_rtp_src_debug);
#define GST_CAT_DEFAULT gst_rtp_src_debug
#define DEFAULT_PROP_TTL 64
#define DEFAULT_PROP_TTL_MC 1
#define DEFAULT_PROP_ENCODING_NAME NULL
#define DEFAULT_PROP_LATENCY 200
#define DEFAULT_PROP_ADDRESS "0.0.0.0"
#define DEFAULT_PROP_PORT 5004
#define DEFAULT_PROP_URI "rtp://"DEFAULT_PROP_ADDRESS":"G_STRINGIFY(DEFAULT_PROP_PORT)
#define DEFAULT_PROP_MULTICAST_IFACE NULL
enum
{
PROP_0,
PROP_URI,
PROP_ADDRESS,
PROP_PORT,
PROP_TTL,
PROP_TTL_MC,
PROP_ENCODING_NAME,
PROP_LATENCY,
PROP_MULTICAST_IFACE,
PROP_LAST
};
static void gst_rtp_src_uri_handler_init (gpointer g_iface,
gpointer iface_data);
#define gst_rtp_src_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstRtpSrc, gst_rtp_src, GST_TYPE_BIN,
G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER, gst_rtp_src_uri_handler_init);
GST_DEBUG_CATEGORY_INIT (gst_rtp_src_debug, "rtpsrc", 0, "RTP Source"));
#define GST_RTP_SRC_GET_LOCK(obj) (&((GstRtpSrc*)(obj))->lock)
#define GST_RTP_SRC_LOCK(obj) (g_mutex_lock (GST_RTP_SRC_GET_LOCK(obj)))
#define GST_RTP_SRC_UNLOCK(obj) (g_mutex_unlock (GST_RTP_SRC_GET_LOCK(obj)))
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS ("application/x-rtp"));
static GstStateChangeReturn
gst_rtp_src_change_state (GstElement * element, GstStateChange transition);
/**
* gst_rtp_src_rtpbin_request_pt_map_cb:
* @self: The current #GstRtpSrc object
*
* #GstRtpBin callback to map a pt on RTP caps.
*
* Returns: (transfer none): the guess on the RTP caps based on the PT
* and caps.
*/
static GstCaps *
gst_rtp_src_rtpbin_request_pt_map_cb (GstElement * rtpbin, guint session_id,
guint pt, gpointer data)
{
GstRtpSrc *self = GST_RTP_SRC (data);
const GstRTPPayloadInfo *p = NULL;
GST_DEBUG_OBJECT (self,
"Requesting caps for session-id 0x%x and pt %u.", session_id, pt);
/* the encoding-name has more relevant information */
if (self->encoding_name != NULL) {
/* Unfortunately, the media needs to be passed in the function. Since
* it is not known, try for video if video not found. */
p = gst_rtp_payload_info_for_name ("video", self->encoding_name);
if (p == NULL)
p = gst_rtp_payload_info_for_name ("audio", self->encoding_name);
}
/* If info has been found before based on the encoding-name, go with
* it. If not, try to look it up on with a static one. Needs to be guarded
* because some encoders do not use dynamic values for H.264 */
if (p == NULL) {
/* Static payload types, this is a simple lookup */
if (!GST_RTP_PAYLOAD_IS_DYNAMIC (pt)) {
p = gst_rtp_payload_info_for_pt (pt);
}
}
if (p != NULL) {
GstCaps *ret = gst_caps_new_simple ("application/x-rtp",
"encoding-name", G_TYPE_STRING, p->encoding_name,
"clock-rate", G_TYPE_INT, p->clock_rate,
"media", G_TYPE_STRING, p->media, NULL);
GST_DEBUG_OBJECT (self, "Decided on caps %" GST_PTR_FORMAT, ret);
return ret;
}
GST_DEBUG_OBJECT (self, "Could not determine caps based on pt and"
" the encoding-name was not set.");
return NULL;
}
static void
gst_rtp_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRtpSrc *self = GST_RTP_SRC (object);
GstCaps *caps;
switch (prop_id) {
case PROP_URI:{
GstUri *uri = NULL;
GST_RTP_SRC_LOCK (object);
uri = gst_uri_from_string (g_value_get_string (value));
if (uri == NULL)
break;
if (self->uri)
gst_uri_unref (self->uri);
self->uri = uri;
/* Recursive set to self, do not use the same lock in all property
* setters. */
g_object_set (self, "address", gst_uri_get_host (self->uri), NULL);
g_object_set (self, "port", gst_uri_get_port (self->uri), NULL);
gst_rtp_utils_set_properties_from_uri_query (G_OBJECT (self), self->uri);
GST_RTP_SRC_UNLOCK (object);
break;
}
case PROP_ADDRESS:{
GInetAddress *addr;
gst_uri_set_host (self->uri, g_value_get_string (value));
g_object_set_property (G_OBJECT (self->rtp_src), "address", value);
addr = g_inet_address_new_from_string (gst_uri_get_host (self->uri));
if (g_inet_address_get_is_multicast (addr)) {
g_object_set (self->rtcp_src, "address", gst_uri_get_host (self->uri),
NULL);
}
g_object_unref (addr);
break;
}
case PROP_PORT:{
guint port = g_value_get_uint (value);
/* According to RFC 3550, 11, RTCP receiver port should be even
* number and RTCP port should be the RTP port + 1 */
if (port & 0x1)
GST_WARNING_OBJECT (self,
"Port %u is odd, this is not standard (see RFC 3550).", port);
gst_uri_set_port (self->uri, port);
g_object_set (self->rtp_src, "port", port, NULL);
g_object_set (self->rtcp_src, "port", port + 1, NULL);
break;
}
case PROP_TTL:
self->ttl = g_value_get_int (value);
break;
case PROP_TTL_MC:
self->ttl_mc = g_value_get_int (value);
break;
case PROP_ENCODING_NAME:
g_free (self->encoding_name);
self->encoding_name = g_value_dup_string (value);
if (self->rtp_src) {
caps = gst_rtp_src_rtpbin_request_pt_map_cb (NULL, 0, 96, self);
g_object_set (G_OBJECT (self->rtp_src), "caps", caps, NULL);
gst_caps_unref (caps);
}
break;
case PROP_LATENCY:
g_object_set (self->rtpbin, "latency", g_value_get_uint (value), NULL);
break;
case PROP_MULTICAST_IFACE:
g_free (self->multi_iface);
if (g_value_get_string (value) == NULL)
self->multi_iface = g_strdup (DEFAULT_PROP_MULTICAST_IFACE);
else
self->multi_iface = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRtpSrc *self = GST_RTP_SRC (object);
switch (prop_id) {
case PROP_URI:
GST_RTP_SRC_LOCK (object);
if (self->uri)
g_value_take_string (value, gst_uri_to_string (self->uri));
else
g_value_set_string (value, NULL);
GST_RTP_SRC_UNLOCK (object);
break;
case PROP_ADDRESS:
g_value_set_string (value, gst_uri_get_host (self->uri));
break;
case PROP_PORT:
g_value_set_uint (value, gst_uri_get_port (self->uri));
break;
case PROP_TTL:
g_value_set_int (value, self->ttl);
break;
case PROP_TTL_MC:
g_value_set_int (value, self->ttl_mc);
break;
case PROP_ENCODING_NAME:
g_value_set_string (value, self->encoding_name);
break;
case PROP_LATENCY:
g_object_get_property (G_OBJECT (self->rtpbin), "latency", value);
break;
case PROP_MULTICAST_IFACE:
g_value_set_string (value, self->multi_iface);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_src_finalize (GObject * gobject)
{
GstRtpSrc *self = GST_RTP_SRC (gobject);
if (self->uri)
gst_uri_unref (self->uri);
g_free (self->encoding_name);
g_free (self->multi_iface);
g_mutex_clear (&self->lock);
G_OBJECT_CLASS (parent_class)->finalize (gobject);
}
static void
gst_rtp_src_class_init (GstRtpSrcClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->set_property = gst_rtp_src_set_property;
gobject_class->get_property = gst_rtp_src_get_property;
gobject_class->finalize = gst_rtp_src_finalize;
gstelement_class->change_state = gst_rtp_src_change_state;
/**
* GstRtpSrc:uri:
*
* uri to an RTP from. All GStreamer parameters can be
* encoded in the URI, this URI format is RFC compliant.
*/
g_object_class_install_property (gobject_class, PROP_URI,
g_param_spec_string ("uri", "URI",
"URI in the form of rtp://host:port?query", DEFAULT_PROP_URI,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpSrc:address:
*
* Address to receive packets from (can be IPv4 or IPv6).
*/
g_object_class_install_property (gobject_class, PROP_ADDRESS,
g_param_spec_string ("address", "Address",
"Address to receive packets from (can be IPv4 or IPv6).",
DEFAULT_PROP_ADDRESS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpSrc:port:
*
* The port to listen to RTP packets, the RTCP port is this value
* +1. This port must be an even number.
*/
g_object_class_install_property (gobject_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, DEFAULT_PROP_PORT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
/**
* GstRtpSrc:ttl:
*
* Set the unicast TTL parameter. In RTP this of importance for RTCP.
*/
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_PROP_TTL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpSrc:ttl-mc:
*
* Set the multicast TTL parameter. In RTP this of importance for RTCP.
*/
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_PROP_TTL_MC, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpSrc:encoding-name:
*
* Set the encoding name of the stream to use. This is a short-hand for
* the full caps and maps typically to the encoding-name in the RTP caps.
*/
g_object_class_install_property (gobject_class, PROP_ENCODING_NAME,
g_param_spec_string ("encoding-name", "Caps encoding name",
"Encoding name use to determine caps parameters",
DEFAULT_PROP_ENCODING_NAME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpSrc:latency:
*
* Set the size of the latency buffer in the
* GstRtpBin/GstRtpJitterBuffer to compensate for network jitter.
*/
g_object_class_install_property (gobject_class, PROP_LATENCY,
g_param_spec_uint ("latency", "Buffer latency in ms",
"Default amount of ms to buffer in the jitterbuffers", 0,
G_MAXUINT, DEFAULT_PROP_LATENCY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpSink:multicast-iface:
*
* The networkinterface on which to join the multicast group
*/
g_object_class_install_property (gobject_class, PROP_MULTICAST_IFACE,
g_param_spec_string ("multicast-iface", "Multicast Interface",
"The network interface on which to join the multicast group."
"This allows multiple interfaces separated by comma. (\"eth0,eth1\")",
DEFAULT_PROP_MULTICAST_IFACE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_template));
gst_element_class_set_static_metadata (gstelement_class,
"RTP Source element",
"Generic/Bin/Src",
"Simple RTP src", "Marc Leeman <marc.leeman@gmail.com>");
}
static void
gst_rtp_src_rtpbin_pad_added_cb (GstElement * element, GstPad * pad,
gpointer data)
{
GstRtpSrc *self = GST_RTP_SRC (data);
GstCaps *caps = gst_pad_query_caps (pad, NULL);
GstPad *upad;
gchar name[48];
/* Expose RTP data pad only */
GST_INFO_OBJECT (self,
"Element %" GST_PTR_FORMAT " added pad %" GST_PTR_FORMAT "with caps %"
GST_PTR_FORMAT ".", element, pad, caps);
/* Sanity checks */
if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK) {
/* Sink pad, do not expose */
gst_caps_unref (caps);
return;
}
if (G_LIKELY (caps)) {
GstCaps *ref_caps = gst_caps_new_empty_simple ("application/x-rtcp");
if (gst_caps_can_intersect (caps, ref_caps)) {
/* SRC RTCP caps, do not expose */
gst_caps_unref (ref_caps);
gst_caps_unref (caps);
return;
}
gst_caps_unref (ref_caps);
} else {
GST_ERROR_OBJECT (self, "Pad with no caps detected.");
gst_caps_unref (caps);
return;
}
gst_caps_unref (caps);
GST_RTP_SRC_LOCK (self);
g_snprintf (name, 48, "src_%u", GST_ELEMENT (self)->numpads);
upad = gst_ghost_pad_new (name, pad);
gst_pad_set_active (upad, TRUE);
gst_element_add_pad (GST_ELEMENT (self), upad);
GST_RTP_SRC_UNLOCK (self);
}
static void
gst_rtp_src_rtpbin_pad_removed_cb (GstElement * element, GstPad * pad,
gpointer data)
{
GstRtpSrc *self = GST_RTP_SRC (data);
GST_INFO_OBJECT (self,
"Element %" GST_PTR_FORMAT " removed pad %" GST_PTR_FORMAT ".", element,
pad);
}
static void
gst_rtp_src_rtpbin_on_ssrc_collision_cb (GstElement * rtpbin, guint session_id,
guint ssrc, gpointer data)
{
GstRtpSrc *self = GST_RTP_SRC (data);
GST_INFO_OBJECT (self,
"Detected an SSRC collision: session-id 0x%x, ssrc 0x%x.", session_id,
ssrc);
}
static void
gst_rtp_src_rtpbin_on_new_ssrc_cb (GstElement * rtpbin, guint session_id,
guint ssrc, gpointer data)
{
GstRtpSrc *self = GST_RTP_SRC (data);
GST_INFO_OBJECT (self, "Detected a new SSRC: session-id 0x%x, ssrc 0x%x.",
session_id, ssrc);
}
static GstPadProbeReturn
gst_rtp_src_on_recv_rtcp (GstPad * pad, GstPadProbeInfo * info,
gpointer user_data)
{
GstRtpSrc *self = GST_RTP_SRC (user_data);
GstBuffer *buffer;
GstNetAddressMeta *meta;
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);
GST_OBJECT_LOCK (self);
g_clear_object (&self->rtcp_send_addr);
self->rtcp_send_addr = g_object_ref (meta->addr);
GST_OBJECT_UNLOCK (self);
return GST_PAD_PROBE_OK;
}
static inline void
gst_rtp_src_attach_net_address_meta (GstRtpSrc * self, GstBuffer * buffer)
{
GST_OBJECT_LOCK (self);
if (self->rtcp_send_addr)
gst_buffer_add_net_address_meta (buffer, self->rtcp_send_addr);
GST_OBJECT_UNLOCK (self);
}
static GstPadProbeReturn
gst_rtp_src_on_send_rtcp (GstPad * pad, GstPadProbeInfo * info,
gpointer user_data)
{
GstRtpSrc *self = GST_RTP_SRC (user_data);
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_rtp_src_attach_net_address_meta (self, buffer);
}
} else {
GstBuffer *buffer = info->data;
info->data = buffer = gst_buffer_make_writable (buffer);
gst_rtp_src_attach_net_address_meta (self, buffer);
}
return GST_PAD_PROBE_OK;
}
static gboolean
gst_rtp_src_start (GstRtpSrc * self)
{
GstPad *pad;
GSocket *socket;
GInetAddress *addr;
GstCaps *caps;
/* Should not be NULL */
g_return_val_if_fail (self->uri != NULL, FALSE);
/* share the socket created by the source */
g_object_get (G_OBJECT (self->rtcp_src), "used-socket", &socket, NULL);
if (!G_IS_SOCKET (socket)) {
GST_WARNING_OBJECT (self, "Could not retrieve RTCP src socket.");
}
addr = g_inet_address_new_from_string (gst_uri_get_host (self->uri));
if (g_inet_address_get_is_multicast (addr)) {
/* mc-ttl is not supported by dynudpsink */
g_socket_set_multicast_ttl (socket, self->ttl_mc);
/* In multicast, send RTCP to the multicast group */
self->rtcp_send_addr =
g_inet_socket_address_new (addr, gst_uri_get_port (self->uri) + 1);
/* set multicast-iface on the udpsrc and udpsink elements */
g_object_set (self->rtcp_src, "multicast-iface", self->multi_iface, NULL);
g_object_set (self->rtcp_sink, "multicast-iface", self->multi_iface, NULL);
g_object_set (self->rtp_src, "multicast-iface", self->multi_iface, NULL);
} else {
/* In unicast, send RTCP to the detected sender address */
g_socket_set_ttl (socket, self->ttl);
pad = gst_element_get_static_pad (self->rtcp_src, "src");
self->rtcp_recv_probe = gst_pad_add_probe (pad,
GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_BUFFER_LIST,
gst_rtp_src_on_recv_rtcp, self, NULL);
gst_object_unref (pad);
}
g_object_unref (addr);
/* no need to set address if unicast */
caps = gst_caps_new_empty_simple ("application/x-rtcp");
g_object_set (self->rtcp_src, "caps", caps, NULL);
gst_caps_unref (caps);
pad = gst_element_get_static_pad (self->rtcp_sink, "sink");
self->rtcp_send_probe = gst_pad_add_probe (pad,
GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_BUFFER_LIST,
gst_rtp_src_on_send_rtcp, self, NULL);
gst_object_unref (pad);
g_object_set (self->rtcp_sink, "socket", socket, "close-socket", FALSE, NULL);
g_object_unref (socket);
gst_element_set_locked_state (self->rtcp_sink, FALSE);
gst_element_sync_state_with_parent (self->rtcp_sink);
return TRUE;
}
static void
gst_rtp_src_stop (GstRtpSrc * self)
{
GstPad *pad;
if (self->rtcp_recv_probe) {
pad = gst_element_get_static_pad (self->rtcp_src, "src");
gst_pad_remove_probe (pad, self->rtcp_recv_probe);
self->rtcp_recv_probe = 0;
gst_object_unref (pad);
}
pad = gst_element_get_static_pad (self->rtcp_sink, "sink");
gst_pad_remove_probe (pad, self->rtcp_send_probe);
self->rtcp_send_probe = 0;
gst_object_unref (pad);
}
static GstStateChangeReturn
gst_rtp_src_change_state (GstElement * element, GstStateChange transition)
{
GstRtpSrc *self = GST_RTP_SRC (element);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GST_DEBUG_OBJECT (self, "Changing state: %s => %s",
gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (gst_rtp_src_start (self) == FALSE)
return GST_STATE_CHANGE_FAILURE;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
ret = GST_STATE_CHANGE_NO_PREROLL;
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
ret = GST_STATE_CHANGE_NO_PREROLL;
break;
case GST_STATE_CHANGE_READY_TO_NULL:
gst_rtp_src_stop (self);
break;
default:
break;
}
return ret;
}
static void
gst_rtp_src_init (GstRtpSrc * self)
{
gchar name[48];
const gchar *missing_plugin = NULL;
self->rtpbin = NULL;
self->rtp_src = NULL;
self->rtcp_src = NULL;
self->rtcp_sink = NULL;
self->multi_iface = g_strdup (DEFAULT_PROP_MULTICAST_IFACE);
self->uri = gst_uri_from_string (DEFAULT_PROP_URI);
self->ttl = DEFAULT_PROP_TTL;
self->ttl_mc = DEFAULT_PROP_TTL_MC;
self->encoding_name = DEFAULT_PROP_ENCODING_NAME;
GST_OBJECT_FLAG_SET (GST_OBJECT (self), GST_ELEMENT_FLAG_SOURCE);
gst_bin_set_suppressed_flags (GST_BIN (self),
GST_ELEMENT_FLAG_SOURCE | GST_ELEMENT_FLAG_SINK);
g_mutex_init (&self->lock);
/* Construct the 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.
*/
self->rtpbin = gst_element_factory_make ("rtpbin", "rtp_recv_rtpbin0");
if (self->rtpbin == NULL) {
missing_plugin = "rtpmanager";
goto missing_plugin;
}
gst_bin_add (GST_BIN (self), self->rtpbin);
/* Add rtpbin callbacks to monitor the operation of rtpbin */
g_signal_connect (self->rtpbin, "pad-added",
G_CALLBACK (gst_rtp_src_rtpbin_pad_added_cb), self);
g_signal_connect (self->rtpbin, "pad-removed",
G_CALLBACK (gst_rtp_src_rtpbin_pad_removed_cb), self);
g_signal_connect (self->rtpbin, "request-pt-map",
G_CALLBACK (gst_rtp_src_rtpbin_request_pt_map_cb), self);
g_signal_connect (self->rtpbin, "on-new-ssrc",
G_CALLBACK (gst_rtp_src_rtpbin_on_new_ssrc_cb), self);
g_signal_connect (self->rtpbin, "on-ssrc-collision",
G_CALLBACK (gst_rtp_src_rtpbin_on_ssrc_collision_cb), self);
self->rtp_src = gst_element_factory_make ("udpsrc", "rtp_rtp_udpsrc0");
if (self->rtp_src == NULL) {
missing_plugin = "udp";
goto missing_plugin;
}
self->rtcp_src = gst_element_factory_make ("udpsrc", "rtp_rtcp_udpsrc0");
if (self->rtcp_src == NULL) {
missing_plugin = "udp";
goto missing_plugin;
}
self->rtcp_sink =
gst_element_factory_make ("dynudpsink", "rtp_rtcp_dynudpsink0");
if (self->rtcp_sink == NULL) {
missing_plugin = "udp";
goto missing_plugin;
}
/* Add elements as needed, since udpsrc/udpsink for RTCP share a socket,
* not all at the same moment */
gst_bin_add (GST_BIN (self), self->rtp_src);
gst_bin_add (GST_BIN (self), self->rtcp_src);
gst_bin_add (GST_BIN (self), self->rtcp_sink);
g_object_set (self->rtcp_sink, "sync", FALSE, "async", FALSE, NULL);
gst_element_set_locked_state (self->rtcp_sink, TRUE);
/* pads are all named */
g_snprintf (name, 48, "recv_rtp_sink_%u", GST_ELEMENT (self)->numpads);
gst_element_link_pads (self->rtp_src, "src", self->rtpbin, name);
g_snprintf (name, 48, "recv_rtcp_sink_%u", GST_ELEMENT (self)->numpads);
gst_element_link_pads (self->rtcp_src, "src", self->rtpbin, name);
g_snprintf (name, 48, "send_rtcp_src_%u", GST_ELEMENT (self)->numpads);
gst_element_link_pads (self->rtpbin, name, self->rtcp_sink, "sink");
if (missing_plugin == NULL)
return;
missing_plugin:
{
GST_ERROR_OBJECT (self, "'%s' plugin is missing.", missing_plugin);
}
}
static GstURIType
gst_rtp_src_uri_get_type (GType type)
{
return GST_URI_SRC;
}
static const gchar *const *
gst_rtp_src_uri_get_protocols (GType type)
{
static const gchar *protocols[] = { (char *) "rtp", NULL };
return protocols;
}
static gchar *
gst_rtp_src_uri_get_uri (GstURIHandler * handler)
{
GstRtpSrc *self = (GstRtpSrc *) handler;
return gst_uri_to_string (self->uri);
}
static gboolean
gst_rtp_src_uri_set_uri (GstURIHandler * handler, const gchar * uri,
GError ** error)
{
GstRtpSrc *self = (GstRtpSrc *) handler;
g_object_set (G_OBJECT (self), "uri", uri, NULL);
return TRUE;
}
static void
gst_rtp_src_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
iface->get_type = gst_rtp_src_uri_get_type;
iface->get_protocols = gst_rtp_src_uri_get_protocols;
iface->get_uri = gst_rtp_src_uri_get_uri;
iface->set_uri = gst_rtp_src_uri_set_uri;
}
/* ex: set tabstop=2 shiftwidth=2 expandtab: */