gstreamer/ext/avtp/gstavtpsink.h
Andre Guedes 37550226d8 avtp: Introduce AVTP sink element
This patch introduces the avtpsink elements which implements a typical
network sink. Implementation is pretty straightforward since the burden
is implemented by GstBaseSink class.

The avtpsink element defines three new properties: 1) network interface
from where AVTPDU should be transmitted, 2) destination MAC address
(usually a multicast address), and 3) socket priority (SO_PRIORITY).

Socket setup and teardown are done in start/stop virtual methods while
AVTPDU transmission is carried out by render(). AVTPDUs are encapsulated
into Ethernet frames and transmitted to the network via AF_PACKET socket
domain.  Linux requires CAP_NET_RAW capability in order to open an
AF_PACKET socket so the application that utilize this element must have
it. For further info about AF_PACKET socket domain see packet(7).

Finally, AVTPDUs are expected to be transmitted at specific times -
according to the GstBuffer presentation timestamp - so the 'sync'
property from GstBaseSink is set to TRUE by default.
2019-07-03 09:59:35 -07:00

67 lines
1.8 KiB
C

/*
* GStreamer AVTP Plugin
* Copyright (C) 2019 Intel Corporation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#ifndef __GST_AVTP_SINK_H__
#define __GST_AVTP_SINK_H__
#include <gst/base/gstbasesink.h>
#include <gst/gst.h>
#include <linux/if_packet.h>
G_BEGIN_DECLS
#define GST_TYPE_AVTP_SINK (gst_avtp_sink_get_type())
#define GST_AVTP_SINK(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AVTP_SINK,GstAvtpSink))
#define GST_AVTP_SINK_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AVTP_SINK,GstAvtpSinkClass))
#define GST_IS_AVTP_SINK(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AVTP_SINK))
#define GST_IS_AVTP_SINK_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AVTP_SINK))
typedef struct _GstAvtpSink GstAvtpSink;
typedef struct _GstAvtpSinkClass GstAvtpSinkClass;
struct _GstAvtpSink
{
GstBaseSink parent;
gchar * ifname;
gchar * address;
gint priority;
int sk_fd;
struct sockaddr_ll sk_addr;
};
struct _GstAvtpSinkClass
{
GstBaseSinkClass parent_class;
};
GType gst_avtp_sink_get_type (void);
gboolean gst_avtp_sink_plugin_init (GstPlugin * plugin);
G_END_DECLS
#endif /* __GST_AVTP_SINK_H__ */