gstreamer/subprojects/gst-plugins-good/gst/rtpmanager/gstrtphdrext-ntp.c

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/* GStreamer
* Copyright (C) <2022> Sebastian Dröge <sebastian@centricular.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-rtphdrextntp64
* @title: rtphdrextntp64
* @short_description: RTP Header Extension for RFC6051 64-bit NTP timestamps for rapid synchronization.
* @see_also: #GstRTPHeaderExtension, #GstRTPBasePayload, #GstRTPBaseDepayload, gstrtpbuffer
*
* Since: 1.22
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtphdrext-ntp.h"
GST_DEBUG_CATEGORY_STATIC (rtphdrext_ntp_debug);
#define GST_CAT_DEFAULT (rtphdrext_ntp_debug)
enum
{
PROP_0,
PROP_INTERVAL,
PROP_EVERY_PACKET,
};
#define DEFAULT_INTERVAL 0
#define DEFAULT_EVERY_PACKET FALSE
static GstStaticCaps ntp_reference_timestamp_caps =
GST_STATIC_CAPS ("timestamp/x-ntp");
struct _GstRTPHeaderExtensionNtp64
{
GstRTPHeaderExtension parent;
GstClockTime last_pts;
GstClockTime interval;
gboolean every_packet;
};
G_DEFINE_TYPE_WITH_CODE (GstRTPHeaderExtensionNtp64,
gst_rtp_header_extension_ntp_64,
GST_TYPE_RTP_HEADER_EXTENSION, GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT,
"rtphdrextntp", 0, "RTP RFC6051 NTP Timestamps Header Extension");
);
GST_ELEMENT_REGISTER_DEFINE (rtphdrextntp64,
"rtphdrextntp64", GST_RANK_MARGINAL, GST_TYPE_RTP_HEADER_EXTENSION_NTP_64);
static GstRTPHeaderExtensionFlags
gst_rtp_header_extension_ntp_get_supported_flags
(GstRTPHeaderExtension * ext)
{
return GST_RTP_HEADER_EXTENSION_ONE_BYTE | GST_RTP_HEADER_EXTENSION_TWO_BYTE;
}
static gsize
gst_rtp_header_extension_ntp_64_get_max_size
(GstRTPHeaderExtension * ext, const GstBuffer * buffer)
{
return 8;
}
static gssize
gst_rtp_header_extension_ntp_64_write (GstRTPHeaderExtension
* ext, const GstBuffer * input_meta, GstRTPHeaderExtensionFlags write_flags,
GstBuffer * output, guint8 * data, gsize size)
{
GstRTPHeaderExtensionNtp64 *self = GST_RTP_HEADER_EXTENSION_NTP_64 (ext);
g_return_val_if_fail (size >=
gst_rtp_header_extension_ntp_64_get_max_size (ext, NULL), -1);
g_return_val_if_fail (write_flags &
gst_rtp_header_extension_ntp_get_supported_flags (ext), -1);
if (self->every_packet
|| self->last_pts == GST_CLOCK_TIME_NONE
|| !GST_BUFFER_PTS_IS_VALID (input_meta)
|| (self->last_pts != GST_BUFFER_PTS (input_meta)
&& (GST_BUFFER_IS_DISCONT (input_meta)
|| (GST_BUFFER_PTS (input_meta) >= self->last_pts
&& GST_BUFFER_PTS (input_meta) - self->last_pts >=
self->interval)))) {
GstCaps *caps;
GstReferenceTimestampMeta *meta;
caps = gst_static_caps_get (&ntp_reference_timestamp_caps);
meta =
gst_buffer_get_reference_timestamp_meta ((GstBuffer *) input_meta,
caps);
if (meta) {
guint64 ntptime =
gst_util_uint64_scale (meta->timestamp, G_GUINT64_CONSTANT (1) << 32,
GST_SECOND);
GST_WRITE_UINT64_BE (data, ntptime);
} else {
memset (data, 0, 8);
}
gst_caps_unref (caps);
self->last_pts = GST_BUFFER_PTS (input_meta);
return 8;
} else {
return 0;
}
}
static gboolean
gst_rtp_header_extension_ntp_64_read (GstRTPHeaderExtension
* ext, GstRTPHeaderExtensionFlags read_flags, const guint8 * data,
gsize size, GstBuffer * buffer)
{
GstCaps *caps;
guint64 ntptime;
GstClockTime timestamp;
if (size < 8)
return FALSE;
caps = gst_static_caps_get (&ntp_reference_timestamp_caps);
ntptime = GST_READ_UINT64_BE (data);
timestamp =
gst_util_uint64_scale (ntptime, GST_SECOND, G_GUINT64_CONSTANT (1) << 32);
gst_buffer_add_reference_timestamp_meta (buffer, caps, timestamp,
GST_CLOCK_TIME_NONE);
gst_caps_unref (caps);
return TRUE;
}
static void
gst_rtp_header_extension_ntp_64_get_property (GObject *
object, guint prop_id, GValue * value, GParamSpec * pspec)
{
GstRTPHeaderExtensionNtp64 *self = GST_RTP_HEADER_EXTENSION_NTP_64 (object);
switch (prop_id) {
case PROP_INTERVAL:
GST_OBJECT_LOCK (self);
g_value_set_uint64 (value, self->interval);
GST_OBJECT_UNLOCK (self);
break;
case PROP_EVERY_PACKET:
GST_OBJECT_LOCK (self);
g_value_set_boolean (value, self->every_packet);
GST_OBJECT_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_header_extension_ntp_64_set_property (GObject *
object, guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstRTPHeaderExtensionNtp64 *self = GST_RTP_HEADER_EXTENSION_NTP_64 (object);
switch (prop_id) {
case PROP_INTERVAL:
GST_OBJECT_LOCK (self);
self->interval = g_value_get_uint64 (value);
GST_OBJECT_UNLOCK (self);
break;
case PROP_EVERY_PACKET:
GST_OBJECT_LOCK (self);
self->every_packet = g_value_get_boolean (value);
GST_OBJECT_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_header_extension_ntp_64_class_init
(GstRTPHeaderExtensionNtp64Class * klass)
{
GstRTPHeaderExtensionClass *rtp_hdr_class;
GstElementClass *gstelement_class;
GObjectClass *gobject_class;
rtp_hdr_class = (GstRTPHeaderExtensionClass *) klass;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->set_property = gst_rtp_header_extension_ntp_64_set_property;
gobject_class->get_property = gst_rtp_header_extension_ntp_64_get_property;
/**
* rtphdrextntp64:interval:
*
* The minimum interval between packets that get the header extension added.
*
* On discontinuities the interval will be reset and the next packet gets
* the header extension added.
*
* Since: 1.22
*/
g_object_class_install_property (gobject_class, PROP_INTERVAL,
g_param_spec_uint64 ("interval", "Interval",
"Interval between consecutive packets that get the header extension added",
0, G_MAXUINT64, DEFAULT_INTERVAL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* rtphdrextntp64:every-packet:
*
* If set to %TRUE the header extension will be added to every packet,
* independent of its timestamp. By default only the first packet with a
* given timestamp will get the header extension added.
*
* Since: 1.22
*/
g_object_class_install_property (gobject_class, PROP_EVERY_PACKET,
g_param_spec_boolean ("every-packet", "Every Packet",
"Add the header extension to every packet", DEFAULT_EVERY_PACKET,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
rtp_hdr_class->get_supported_flags =
gst_rtp_header_extension_ntp_get_supported_flags;
rtp_hdr_class->get_max_size = gst_rtp_header_extension_ntp_64_get_max_size;
rtp_hdr_class->write = gst_rtp_header_extension_ntp_64_write;
rtp_hdr_class->read = gst_rtp_header_extension_ntp_64_read;
gst_element_class_set_static_metadata (gstelement_class,
"RTP Header Extension RFC6051 64-bit NTP timestamp",
GST_RTP_HDREXT_ELEMENT_CLASS,
"Extends RTP packets to add or retrieve a 64-bit NTP "
"timestamp as specified in RFC6051",
"Sebastian Dröge <sebastian@centricular.com>");
gst_rtp_header_extension_class_set_uri (rtp_hdr_class,
GST_RTP_HDREXT_BASE GST_RTP_HDREXT_NTP_64);
}
static void
gst_rtp_header_extension_ntp_64_init (GstRTPHeaderExtensionNtp64 * self)
{
self->last_pts = GST_CLOCK_TIME_NONE;
self->interval = DEFAULT_INTERVAL;
self->every_packet = DEFAULT_EVERY_PACKET;
}