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/*
* gstrtponviftimestamp-parse.c
*
* Copyright (C) 2014 Axis Communications AB
* Author: Guillaume Desmottes <guillaume.desmottes@collabora.com>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtponvifparse.h"
static GstFlowReturn gst_rtp_onvif_parse_chain (GstPad * pad,
GstObject * parent, GstBuffer * buf);
static GstStaticPadTemplate sink_template_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp")
);
static GstStaticPadTemplate src_template_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp")
);
G_DEFINE_TYPE (GstRtpOnvifParse, gst_rtp_onvif_parse, GST_TYPE_ELEMENT);
static void
gst_rtp_onvif_parse_class_init (GstRtpOnvifParseClass * klass)
{
GstElementClass *gstelement_class;
gstelement_class = GST_ELEMENT_CLASS (klass);
/* register pads */
gst_element_class_add_static_pad_template (gstelement_class,
&sink_template_factory);
gst_element_class_add_static_pad_template (gstelement_class,
&src_template_factory);
gst_element_class_set_static_metadata (gstelement_class,
"ONVIF NTP timestamps RTP extension", "Effect/RTP",
"Add absolute timestamps and flags of recorded data in a playback "
"session", "Guillaume Desmottes <guillaume.desmottes@collabora.com>");
}
static void
gst_rtp_onvif_parse_init (GstRtpOnvifParse * self)
{
self->sinkpad =
gst_pad_new_from_static_template (&sink_template_factory, "sink");
gst_pad_set_chain_function (self->sinkpad, gst_rtp_onvif_parse_chain);
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
GST_PAD_SET_PROXY_CAPS (self->sinkpad);
self->srcpad =
gst_pad_new_from_static_template (&src_template_factory, "src");
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
}
#define EXTENSION_ID 0xABAC
#define EXTENSION_SIZE 3
static gboolean
handle_buffer (GstRtpOnvifParse * self, GstBuffer * buf, gboolean * send_eos)
{
GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
guint8 *data;
guint16 bits;
guint wordlen;
guint8 flags;
guint64 timestamp_seconds;
guint64 timestamp_fraction;
guint64 timestamp_nseconds;
/*
guint8 cseq;
*/
if (!gst_rtp_buffer_map (buf, GST_MAP_READWRITE, &rtp)) {
GST_ELEMENT_ERROR (self, STREAM, FAILED,
("Failed to map RTP buffer"), (NULL));
return FALSE;
}
/* Check if the ONVIF RTP extension is present in the packet */
if (!gst_rtp_buffer_get_extension_data (&rtp, &bits, (gpointer) & data,
&wordlen))
goto out;
if (bits != EXTENSION_ID || wordlen != EXTENSION_SIZE)
goto out;
timestamp_seconds = GST_READ_UINT32_BE (data);
timestamp_fraction = GST_READ_UINT32_BE (data + 4);
timestamp_nseconds =
(timestamp_fraction * G_GINT64_CONSTANT (1000000000)) >> 32;
if (timestamp_seconds == G_MAXUINT32 && timestamp_fraction == G_MAXUINT32) {
GST_BUFFER_PTS (buf) = GST_CLOCK_TIME_NONE;
} else {
GST_BUFFER_PTS (buf) =
timestamp_seconds * GST_SECOND + timestamp_nseconds * GST_NSECOND;
}
flags = GST_READ_UINT8 (data + 8);
/* cseq = GST_READ_UINT8 (data + 9); TODO */
/* C */
if (flags & (1 << 7))
GST_BUFFER_FLAG_UNSET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
/* E */
/* if (flags & (1 << 6)); TODO */
/* D */
if (flags & (1 << 5))
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
else
GST_BUFFER_FLAG_UNSET (buf, GST_BUFFER_FLAG_DISCONT);
/* T */
if (flags & (1 << 4))
*send_eos = TRUE;
out:
gst_rtp_buffer_unmap (&rtp);
return TRUE;
}
static GstFlowReturn
gst_rtp_onvif_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstRtpOnvifParse *self = GST_RTP_ONVIF_PARSE (parent);
GstFlowReturn ret;
gboolean send_eos = FALSE;
if (!handle_buffer (self, buf, &send_eos)) {
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
ret = gst_pad_push (self->srcpad, buf);
if (ret == GST_FLOW_OK && send_eos) {
GstEvent *event;
event = gst_event_new_eos ();
gst_pad_push_event (self->srcpad, event);
ret = GST_FLOW_EOS;
}
return ret;
}
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