gstreamer/ext/avtp/gstavtpbasedepayload.c

261 lines
8.3 KiB
C
Raw Normal View History

/*
* 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
*/
#include "gstavtpbasedepayload.h"
GST_DEBUG_CATEGORY_STATIC (avtpbasedepayload_debug);
#define GST_CAT_DEFAULT (avtpbasedepayload_debug)
#define DEFAULT_STREAMID 0xAABBCCDDEEFF0000
enum
{
PROP_0,
PROP_STREAMID,
};
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-avtp")
);
static void gst_avtp_base_depayload_class_init (GstAvtpBaseDepayloadClass *
klass);
static void gst_avtp_base_depayload_init (GstAvtpBaseDepayload *
avtpbasedepayload, gpointer g_class);
static void gst_avtp_base_depayload_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_avtp_base_depayload_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static gboolean gst_avtp_base_depayload_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
GType
gst_avtp_base_depayload_get_type (void)
{
static GType avtpbasedepayload_type = 0;
if (g_once_init_enter ((gsize *) & avtpbasedepayload_type)) {
static const GTypeInfo avtpbasedepayload_info = {
sizeof (GstAvtpBaseDepayloadClass),
NULL,
NULL,
(GClassInitFunc) gst_avtp_base_depayload_class_init,
NULL,
NULL,
sizeof (GstAvtpBaseDepayload),
0,
(GInstanceInitFunc) gst_avtp_base_depayload_init,
};
GType _type;
_type = g_type_register_static (GST_TYPE_ELEMENT, "GstAvtpBaseDepayload",
&avtpbasedepayload_info, G_TYPE_FLAG_ABSTRACT);
g_once_init_leave ((gsize *) & avtpbasedepayload_type, _type);
}
return avtpbasedepayload_type;
}
static void
gst_avtp_base_depayload_class_init (GstAvtpBaseDepayloadClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->set_property = gst_avtp_base_depayload_set_property;
object_class->get_property = gst_avtp_base_depayload_get_property;
g_object_class_install_property (object_class, PROP_STREAMID,
g_param_spec_uint64 ("streamid", "Stream ID",
"Stream ID associated with the AVTPDU", 0, G_MAXUINT64,
DEFAULT_STREAMID, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_PAUSED));
klass->chain = NULL;
klass->sink_event = GST_DEBUG_FUNCPTR (gst_avtp_base_depayload_sink_event);
GST_DEBUG_CATEGORY_INIT (avtpbasedepayload_debug, "avtpbasedepayload", 0,
"Base class for AVTP depayloaders");
}
static void
gst_avtp_base_depayload_init (GstAvtpBaseDepayload * avtpbasedepayload,
gpointer g_class)
{
GstPadTemplate *templ;
GstElement *element = GST_ELEMENT (avtpbasedepayload);
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstAvtpBaseDepayloadClass *avtpbasedepayload_class =
GST_AVTP_BASE_DEPAYLOAD_CLASS (g_class);
g_assert (avtpbasedepayload_class->chain != NULL);
templ = gst_element_class_get_pad_template (element_class, "src");
g_assert (templ != NULL);
avtpbasedepayload->srcpad = gst_pad_new_from_template (templ, "src");
gst_pad_use_fixed_caps (avtpbasedepayload->srcpad);
gst_element_add_pad (element, avtpbasedepayload->srcpad);
avtpbasedepayload->sinkpad =
gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_chain_function (avtpbasedepayload->sinkpad,
avtpbasedepayload_class->chain);
gst_pad_set_event_function (avtpbasedepayload->sinkpad,
avtpbasedepayload_class->sink_event);
gst_element_add_pad (element, avtpbasedepayload->sinkpad);
avtpbasedepayload->streamid = DEFAULT_STREAMID;
avtpbasedepayload->prev_ptime = 0;
avtpbasedepayload->seqnum = 0;
}
static void
gst_avtp_base_depayload_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAvtpBaseDepayload *avtpbasedepayload = GST_AVTP_BASE_DEPAYLOAD (object);
GST_DEBUG_OBJECT (avtpbasedepayload, "prop_id %u", prop_id);
switch (prop_id) {
case PROP_STREAMID:
avtpbasedepayload->streamid = g_value_get_uint64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_avtp_base_depayload_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstAvtpBaseDepayload *avtpbasedepayload = GST_AVTP_BASE_DEPAYLOAD (object);
GST_DEBUG_OBJECT (avtpbasedepayload, "prop_id %u", prop_id);
switch (prop_id) {
case PROP_STREAMID:
g_value_set_uint64 (value, avtpbasedepayload->streamid);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_avtp_base_depayload_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstAvtpBaseDepayload *avtpbasedepayload = GST_AVTP_BASE_DEPAYLOAD (parent);
GST_DEBUG_OBJECT (avtpbasedepayload, "event %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEGMENT:
/* Once the first AVTPDU is received, proper CAPS and SEGMENT events are
* pushed downstream. These events are expected to be pushed in that
* order by GStreamer. Since the default handling implemented by
* gst_pad_event_default() pushes the SEGMENT event downstream right
* away, it doesn't work for us and we have to handle it ourselves.
*
* Our handling is very straightforward: we discard this event and send
* a proper segment event once the first AVTPDU is received. See
* gst_avtp_base_depayload_push_segment_event() for more information.
*/
gst_event_unref (event);
return TRUE;
default:
return gst_pad_event_default (pad, parent, event);
}
}
/* Helper function to convert AVTP timestamp to AVTP presentation time. Since
* AVTP timestamp represents the lower 32-bit part from AVTP presentation time,
* the helper requires a reference time ('ref' argument) to convert it properly.
* The reference time must be in gstreamer clock-time coordinate.
*/
GstClockTime
gst_avtp_base_depayload_tstamp_to_ptime (GstAvtpBaseDepayload *
avtpbasedepayload, guint32 tstamp, GstClockTime ref)
{
GstClockTime ptime;
ptime = (ref & 0xFFFFFFFF00000000ULL) | tstamp;
/* If 'ptime' is less than the our reference time, it means the higher part
* from 'ptime' needs to be incremented by 1 in order reflect the correct
* presentation time.
*/
if (ptime < ref)
ptime += (1ULL << 32);
GST_LOG_OBJECT (avtpbasedepayload, "AVTP presentation time %" GST_TIME_FORMAT,
GST_TIME_ARGS (ptime));
return ptime;
}
gboolean
gst_avtp_base_depayload_push_segment_event (GstAvtpBaseDepayload *
avtpbasedepayload, guint32 avtp_tstamp)
{
GstClock *clock;
GstEvent *event;
GstSegment segment;
GstClockTime now, base_time, avtp_ptime;
clock = GST_ELEMENT_CLOCK (avtpbasedepayload);
now = gst_clock_get_time (clock);
avtp_ptime =
gst_avtp_base_depayload_tstamp_to_ptime (avtpbasedepayload, avtp_tstamp,
now);
base_time = gst_element_get_base_time (GST_ELEMENT (avtpbasedepayload));
gst_segment_init (&segment, GST_FORMAT_TIME);
segment.base = avtp_ptime - base_time;
segment.start = avtp_ptime;
segment.stop = -1;
event = gst_event_new_segment (&segment);
if (!event) {
GST_ERROR_OBJECT (avtpbasedepayload, "Failed to create SEGMENT event");
return FALSE;
}
if (!gst_pad_push_event (avtpbasedepayload->srcpad, event)) {
GST_ERROR_OBJECT (avtpbasedepayload, "Failed to push SEGMENT event");
return FALSE;
}
GST_DEBUG_OBJECT (avtpbasedepayload, "SEGMENT event pushed: %"
GST_SEGMENT_FORMAT, &segment);
avtpbasedepayload->prev_ptime = avtp_ptime;
return TRUE;
}