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