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37550226d8
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.
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/*
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* GStreamer AVTP Plugin
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* Copyright (C) 2019 Intel Corporation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later
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* version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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#ifndef __GST_AVTP_SINK_H__
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#define __GST_AVTP_SINK_H__
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#include <gst/base/gstbasesink.h>
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#include <gst/gst.h>
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#include <linux/if_packet.h>
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G_BEGIN_DECLS
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#define GST_TYPE_AVTP_SINK (gst_avtp_sink_get_type())
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#define GST_AVTP_SINK(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AVTP_SINK,GstAvtpSink))
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#define GST_AVTP_SINK_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AVTP_SINK,GstAvtpSinkClass))
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#define GST_IS_AVTP_SINK(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AVTP_SINK))
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#define GST_IS_AVTP_SINK_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AVTP_SINK))
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typedef struct _GstAvtpSink GstAvtpSink;
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typedef struct _GstAvtpSinkClass GstAvtpSinkClass;
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struct _GstAvtpSink
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{
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GstBaseSink parent;
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gchar * ifname;
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gchar * address;
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gint priority;
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int sk_fd;
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struct sockaddr_ll sk_addr;
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};
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struct _GstAvtpSinkClass
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{
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GstBaseSinkClass parent_class;
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};
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GType gst_avtp_sink_get_type (void);
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gboolean gst_avtp_sink_plugin_init (GstPlugin * plugin);
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G_END_DECLS
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#endif /* __GST_AVTP_SINK_H__ */
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