gstreamer/subprojects/gst-plugins-good/gst/udp/gstudpnetutils.c
Seungha Yang 3374f2f44d udpsrc: Add support for IGMPv3 SSM
Adding "multicast-source" property to support Source Specific Muliticast
RFC 4604. The source can be multiple address with '+' (for positive
filter) or '-' (negative filter) prefix, or URI query can be used.
Note that negative filter is not implemented yet and it will be
ignored

Example:
gst-launch-1.0 uridecodebin \
  uri=udp://{ADDRESS}:PORT?multicast-source=+SOURCE0+SOURCE1

Inspired by:
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2620

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3485>
2023-04-12 16:32:07 +00:00

136 lines
3.6 KiB
C

/* GStreamer UDP network utility functions
* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
* Copyright (C) 2006 Joni Valtanen <joni.valtanen@movial.fi>
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <string.h>
#include "gstudpnetutils.h"
GST_DEBUG_CATEGORY_EXTERN (gst_udp_debug);
#define GST_CAT_DEFAULT gst_udp_debug
gboolean
gst_udp_parse_uri (const gchar * uristr, gchar ** host, guint16 * port,
GPtrArray * source_list)
{
GstUri *uri;
const gchar *protocol;
uri = gst_uri_from_string (uristr);
if (!uri) {
GST_ERROR ("Invalid URI string %s", uristr);
return FALSE;
}
/* consider no protocol to be udp:// */
protocol = gst_uri_get_scheme (uri);
if (!protocol) {
GST_ERROR ("error parsing uri %s: no protocol", uristr);
goto error;
} else if (g_strcmp0 (protocol, "udp")) {
GST_ERROR ("error parsing uri %s: wrong protocol (%s != udp)", uristr,
protocol);
goto error;
}
*host = g_strdup (gst_uri_get_host (uri));
if (*host == NULL) {
GST_ERROR ("Unknown host");
goto error;
}
GST_DEBUG ("host set to '%s'", *host);
*port = gst_uri_get_port (uri);
if (source_list) {
const gchar *source = gst_uri_get_query_value (uri, "multicast-source");
if (source)
gst_udp_parse_multicast_source (source, source_list);
}
gst_uri_unref (uri);
return TRUE;
error:
gst_uri_unref (uri);
return FALSE;
}
static gboolean
gst_udp_source_filter_equal_func (gconstpointer a, gconstpointer b)
{
return g_strcmp0 ((const gchar *) a, (const gchar *) b) == 0;
}
gboolean
gst_udp_parse_multicast_source (const gchar * multicast_source,
GPtrArray * source_list)
{
gchar **list;
guint i;
gboolean found = FALSE;
if (!multicast_source || !source_list)
return FALSE;
GST_DEBUG ("Parsing multicast source \"%s\"", multicast_source);
list = g_strsplit_set (multicast_source, "+-", 0);
for (i = 0; list[i] != NULL; i++) {
gchar *prefix;
gboolean is_positive = FALSE;
if (*list[i] == '\0')
continue;
prefix = g_strrstr (multicast_source, list[i]);
g_assert (prefix);
/* Begin without '+' or '-' prefix, assume it's positive filter */
if (prefix == multicast_source) {
GST_WARNING ("%s without prefix, assuming that it's positive filter",
list[i]);
is_positive = TRUE;
} else if (*(prefix - 1) == '+') {
is_positive = TRUE;
}
if (is_positive &&
!g_ptr_array_find_with_equal_func (source_list, list[i],
gst_udp_source_filter_equal_func, NULL)) {
GST_DEBUG ("Add multicast-source %s", list[i]);
/* Moves ownership to array */
g_ptr_array_add (source_list, g_strdup (list[i]));
found = TRUE;
}
}
g_strfreev (list);
return found;
}