add rtponviftimestamp element

https://bugzilla.gnome.org/show_bug.cgi?id=731769

4 files changed, 593 insertions, 0 deletions

diff --git a/gst/onvif/Makefile.am b/gst/onvif/Makefile.am
new file mode 100644
index 000000000..9d0223bd4
--- /dev/null
+++ b/gst/onvif/Makefile.am
@@ -0,0 +1,28 @@
+plugin_LTLIBRARIES = libgstrtponvif.la
+
+libgstrtponvif_la_SOURCES = \
+	gstrtponvif.c \
+	gstrtponviftimestamp.c gstrtponviftimestamp.h
+libgstrtponvif_la_CFLAGS = $(GST_PLUGINS_BAD_CFLAGS) $(GST_PLUGINS_BASE_CFLAGS) \
+	$(GST_BASE_CFLAGS) $(GST_CFLAGS)
+libgstrtponvif_la_LIBADD = $(GST_PLUGINS_BASE_LIBS) \
+	$(GST_BASE_LIBS) $(GST_LIBS) -lgstrtp-$(GST_API_VERSION)
+libgstrtponvif_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
+libgstrtponvif_la_LIBTOOLFLAGS = $(GST_PLUGIN_LIBTOOLFLAGS)
+
+
+EXTRA_DIST =
+
+Android.mk: Makefile.am $(BUILT_SOURCES)
+	androgenizer \
+	-:PROJECT libgstrtponvif -:SHARED libgstrtponvif \
+	 -:TAGS eng debug \
+         -:REL_TOP $(top_srcdir) -:ABS_TOP $(abs_top_srcdir) \
+	 -:SOURCES $(libgstrtponvif_la_SOURCES) \
+	 -:CFLAGS $(DEFS) $(DEFAULT_INCLUDES) $(libgstrtponvif_la_CFLAGS) \
+	 -:LDFLAGS $(libgstrtponvif_la_LDFLAGS) \
+	           $(libgstrtponvif_la_LIBADD) \
+	           -ldl \
+	 -:PASSTHROUGH LOCAL_ARM_MODE:=arm \
+		       LOCAL_MODULE_PATH:='$$(TARGET_OUT)/lib/gstreamer-0.10' \
+	> $@
diff --git a/gst/onvif/gstrtponvif.c b/gst/onvif/gstrtponvif.c
new file mode 100644
index 000000000..8f24d94fb
--- /dev/null
+++ b/gst/onvif/gstrtponvif.c
@@ -0,0 +1,44 @@
+/*
+ * gstrtponvif.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 <gst/gst.h>
+
+#include "gstrtponviftimestamp.h"
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  if (!gst_element_register (plugin, "rtponviftimestamp", GST_RANK_NONE,
+          GST_TYPE_RTP_ONVIF_TIMESTAMP))
+    return FALSE;
+
+  return TRUE;
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    rtponvif,
+    "ONVIF Streaming features",
+    plugin_init, VERSION, GST_LICENSE_UNKNOWN, GST_PACKAGE_NAME,
+    GST_PACKAGE_ORIGIN)
diff --git a/gst/onvif/gstrtponviftimestamp.c b/gst/onvif/gstrtponviftimestamp.c
new file mode 100644
index 000000000..8493da670
--- /dev/null
+++ b/gst/onvif/gstrtponviftimestamp.c
@@ -0,0 +1,449 @@
+/*
+ * gstrtponviftimestamp.h
+ *
+ * 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 "gstrtponviftimestamp.h"
+
+#define DEFAULT_NTP_OFFSET 0
+#define DEFAULT_CSEQ 0
+#define DEFAULT_SET_E_BIT FALSE
+
+GST_DEBUG_CATEGORY_STATIC (rtponviftimestamp_debug);
+#define GST_CAT_DEFAULT (rtponviftimestamp_debug)
+
+static GstFlowReturn gst_rtp_onvif_timestamp_chain (GstPad * pad,
+    GstObject * parent, GstBuffer * buf);
+static GstFlowReturn gst_rtp_onvif_timestamp_chain_list (GstPad * pad,
+    GstObject * parent, GstBufferList * list);
+
+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")
+    );
+
+enum
+{
+  ARG_0,
+  PROP_NTP_OFFSET,
+  PROP_CSEQ,
+  PROP_SET_E_BIT,
+};
+
+/*static guint gst_rtp_onvif_timestamp_signals[LAST_SIGNAL] = { 0 }; */
+
+G_DEFINE_TYPE (GstRtpOnvifTimestamp, gst_rtp_onvif_timestamp, GST_TYPE_ELEMENT);
+
+static void
+gst_rtp_onvif_timestamp_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  GstRtpOnvifTimestamp *self = GST_RTP_ONVIF_TIMESTAMP (object);
+
+  switch (prop_id) {
+    case PROP_NTP_OFFSET:
+      g_value_set_uint64 (value, self->prop_ntp_offset);
+      break;
+    case PROP_CSEQ:
+      g_value_set_uint (value, self->prop_cseq);
+      break;
+    case PROP_SET_E_BIT:
+      g_value_set_boolean (value, self->prop_set_e_bit);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_rtp_onvif_timestamp_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  GstRtpOnvifTimestamp *self = GST_RTP_ONVIF_TIMESTAMP (object);
+
+  switch (prop_id) {
+    case PROP_NTP_OFFSET:
+      self->prop_ntp_offset = g_value_get_uint64 (value);
+      break;
+    case PROP_CSEQ:
+      self->prop_cseq = g_value_get_uint (value);
+      break;
+    case PROP_SET_E_BIT:
+      self->prop_set_e_bit = g_value_get_boolean (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstStateChangeReturn
+gst_rtp_onvif_timestamp_change_state (GstElement * element,
+    GstStateChange transition)
+{
+  GstRtpOnvifTimestamp *self = GST_RTP_ONVIF_TIMESTAMP (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      gst_segment_init (&self->segment, GST_FORMAT_UNDEFINED);
+      break;
+    default:
+      break;
+  }
+
+  return
+      GST_ELEMENT_CLASS (gst_rtp_onvif_timestamp_parent_class)->change_state
+      (element, transition);
+}
+
+static void
+gst_rtp_onvif_timestamp_finalize (GObject * object)
+{
+  GstRtpOnvifTimestamp *self = GST_RTP_ONVIF_TIMESTAMP (object);
+
+  if (self->buffer)
+    gst_buffer_unref (self->buffer);
+  if (self->list)
+    gst_buffer_list_unref (self->list);
+
+  G_OBJECT_CLASS (gst_rtp_onvif_timestamp_parent_class)->finalize (object);
+}
+
+static void
+gst_rtp_onvif_timestamp_class_init (GstRtpOnvifTimestampClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = G_OBJECT_CLASS (klass);
+  gstelement_class = GST_ELEMENT_CLASS (klass);
+
+  gobject_class->get_property = gst_rtp_onvif_timestamp_get_property;
+  gobject_class->set_property = gst_rtp_onvif_timestamp_set_property;
+  gobject_class->finalize = gst_rtp_onvif_timestamp_finalize;
+
+  g_object_class_install_property (gobject_class, PROP_NTP_OFFSET,
+      g_param_spec_uint64 ("ntp-offset", "NTP offset",
+          "Offset between the pipeline running time and the absolute UTC time, "
+          "in seconds since 1900",
+          0, G_MAXUINT64,
+          DEFAULT_NTP_OFFSET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (gobject_class, PROP_CSEQ,
+      g_param_spec_uint ("cseq", "CSeq",
+          "The RTSP CSeq which initiated the playback",
+          0, G_MAXUINT32,
+          DEFAULT_CSEQ, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (gobject_class, PROP_SET_E_BIT,
+      g_param_spec_boolean ("set-e-bit", "Set 'E' bit",
+          "If the element should set the 'E' bit as defined in the ONVIF RTP "
+          "extension. This increases latency by one packet",
+          DEFAULT_SET_E_BIT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  /* register pads */
+  gst_element_class_add_pad_template (gstelement_class,
+      gst_static_pad_template_get (&sink_template_factory));
+  gst_element_class_add_pad_template (gstelement_class,
+      gst_static_pad_template_get (&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>");
+
+  gstelement_class->change_state =
+      GST_DEBUG_FUNCPTR (gst_rtp_onvif_timestamp_change_state);
+
+  GST_DEBUG_CATEGORY_INIT (rtponviftimestamp_debug, "rtponviftimestamp",
+      0, "ONVIF NTP timestamps RTP extension");
+}
+
+static GstFlowReturn handle_and_push_buffer (GstRtpOnvifTimestamp * self,
+    GstBuffer * buf, gboolean end_contiguous);
+static GstFlowReturn handle_and_push_buffer_list (GstRtpOnvifTimestamp * self,
+    GstBufferList * list, gboolean end_contiguous);
+
+static gboolean
+gst_rtp_onvif_timestamp_sink_event (GstPad * pad, GstObject * parent,
+    GstEvent * event)
+{
+  GstRtpOnvifTimestamp *self = GST_RTP_ONVIF_TIMESTAMP (parent);
+
+  GST_DEBUG_OBJECT (pad, "handling event %s", GST_EVENT_TYPE_NAME (event));
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_SEGMENT:
+      gst_event_copy_segment (event, &self->segment);
+      break;
+    case GST_EVENT_FLUSH_STOP:
+      gst_segment_init (&self->segment, GST_FORMAT_UNDEFINED);
+      break;
+    case GST_EVENT_EOS:
+      /* Push pending buffers, if any */
+      if (self->buffer) {
+        handle_and_push_buffer (self, self->buffer, TRUE);
+        self->buffer = NULL;
+      }
+      if (self->list) {
+        handle_and_push_buffer_list (self, self->list, TRUE);
+        self->list = NULL;
+      }
+      break;
+    default:
+      break;
+  }
+
+  return gst_pad_event_default (pad, parent, event);
+}
+
+static void
+gst_rtp_onvif_timestamp_init (GstRtpOnvifTimestamp * self)
+{
+  self->sinkpad =
+      gst_pad_new_from_static_template (&sink_template_factory, "sink");
+  gst_pad_set_chain_function (self->sinkpad, gst_rtp_onvif_timestamp_chain);
+  gst_pad_set_chain_list_function (self->sinkpad,
+      gst_rtp_onvif_timestamp_chain_list);
+  gst_pad_set_event_function (self->sinkpad,
+      gst_rtp_onvif_timestamp_sink_event);
+  gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
+  GST_PAD_SET_PROXY_CAPS (self->sinkpad);
+  GST_PAD_SET_PROXY_ALLOCATION (self->sinkpad);
+
+  self->srcpad =
+      gst_pad_new_from_static_template (&src_template_factory, "src");
+  gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
+
+  self->prop_ntp_offset = DEFAULT_NTP_OFFSET;
+  self->prop_set_e_bit = DEFAULT_SET_E_BIT;
+
+  self->buffer = NULL;
+  self->list = NULL;
+
+  gst_segment_init (&self->segment, GST_FORMAT_UNDEFINED);
+}
+
+#define EXTENSION_ID 0xABAC
+#define EXTENSION_SIZE 3
+
+static gboolean
+handle_buffer (GstRtpOnvifTimestamp * self, GstBuffer * buf,
+    gboolean end_contiguous)
+{
+  GstRTPBuffer rtp = GST_RTP_BUFFER_INIT;
+  guint8 *data;
+  guint16 bits;
+  guint wordlen;
+  guint64 time;
+  guint8 field = 0;
+
+  if (self->segment.format != GST_FORMAT_TIME) {
+    GST_ELEMENT_ERROR (self, STREAM, FAILED,
+        ("did not receive a time segment yet"), (NULL));
+    return FALSE;
+  }
+
+  if (!gst_rtp_buffer_map (buf, GST_MAP_READWRITE, &rtp)) {
+    GST_ELEMENT_ERROR (self, STREAM, FAILED,
+        ("Failed to map RTP buffer"), (NULL));
+    return FALSE;
+  }
+
+  if (!gst_rtp_buffer_set_extension_data (&rtp, EXTENSION_ID, EXTENSION_SIZE)) {
+    GST_ELEMENT_ERROR (self, STREAM, FAILED, ("Failed to set extension data"),
+        (NULL));
+    gst_rtp_buffer_unmap (&rtp);
+    return FALSE;
+  }
+
+  if (!gst_rtp_buffer_get_extension_data (&rtp, &bits, (gpointer) & data,
+          &wordlen)) {
+    GST_ELEMENT_ERROR (self, STREAM, FAILED, ("Failed to get extension data"),
+        (NULL));
+    gst_rtp_buffer_unmap (&rtp);
+    return FALSE;
+  }
+
+  /* NTP timestamp */
+  if (GST_BUFFER_DTS_IS_VALID (buf)) {
+    time = gst_segment_to_running_time (&self->segment, GST_FORMAT_TIME,
+        GST_BUFFER_DTS (buf));
+  } else if (GST_BUFFER_PTS_IS_VALID (buf)) {
+    time = gst_segment_to_running_time (&self->segment, GST_FORMAT_TIME,
+        GST_BUFFER_PTS (buf));
+  } else {
+    GST_ERROR_OBJECT (self,
+        "Buffer doesn't contain any valid DTS or PTS timestamp");
+    goto done;
+  }
+
+  if (time == GST_CLOCK_TIME_NONE) {
+    GST_ERROR_OBJECT (self, "Failed to get running time");
+    goto done;
+  }
+
+  /* add the offset (in seconds) */
+  time += (self->prop_ntp_offset * GST_SECOND);
+
+  /* convert to NTP time. upper 32 bits should contain the seconds
+   * and the lower 32 bits, the fractions of a second. */
+  time = gst_util_uint64_scale (time, (G_GINT64_CONSTANT (1) << 32),
+      GST_SECOND);
+
+  GST_DEBUG_OBJECT (self, "timestamp: %" G_GUINT64_FORMAT, time);
+
+  GST_WRITE_UINT64_BE (data, time);
+
+  /* The next byte is composed of: C E D mbz (5 bits) */
+
+  /* Set C if the buffer does *not* have the DELTA_UNIT flag as it means
+   * that's a key frame (or 'clean point'). */
+  if (!GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
+    GST_DEBUG_OBJECT (self, "set C flag");
+    field |= (1 << 7);
+  }
+
+  /* Set E if the next buffer has DISCONT */
+  if (end_contiguous) {
+    GST_DEBUG_OBJECT (self, "set E flag");
+    field |= (1 << 6);
+  }
+
+  /* Set D if the buffer has the DISCONT flag */
+  if (GST_BUFFER_IS_DISCONT (buf)) {
+    GST_DEBUG_OBJECT (self, "set D flag");
+    field |= (1 << 5);
+  }
+
+  GST_WRITE_UINT8 (data + 8, field);
+
+  /* CSeq (low-order byte) */
+  GST_WRITE_UINT8 (data + 9, (guchar) self->prop_cseq);
+
+  memset (data + 10, 0, 3);
+
+done:
+  gst_rtp_buffer_unmap (&rtp);
+  return TRUE;
+}
+
+/* @buf: (transfer all) */
+static GstFlowReturn
+handle_and_push_buffer (GstRtpOnvifTimestamp * self, GstBuffer * buf,
+    gboolean end_contiguous)
+{
+  if (!handle_buffer (self, buf, end_contiguous)) {
+    gst_buffer_unref (buf);
+    return GST_FLOW_ERROR;
+  }
+
+  return gst_pad_push (self->srcpad, buf);
+}
+
+static GstFlowReturn
+gst_rtp_onvif_timestamp_chain (GstPad * pad, GstObject * parent,
+    GstBuffer * buf)
+{
+  GstRtpOnvifTimestamp *self = GST_RTP_ONVIF_TIMESTAMP (parent);
+  GstFlowReturn result = GST_FLOW_OK;
+
+  if (!self->prop_set_e_bit) {
+    /* Modify and push this buffer right away */
+    return handle_and_push_buffer (self, buf, FALSE);
+  }
+
+  /* We have to wait for the *next* buffer before pushing this one */
+
+  if (self->buffer) {
+    /* push the *previous* buffer received */
+    result = handle_and_push_buffer (self, self->buffer,
+        GST_BUFFER_IS_DISCONT (buf));
+  }
+
+  /* Transfer ownership */
+  self->buffer = buf;
+  return result;
+}
+
+/* @buf: (transfer all) */
+static GstFlowReturn
+handle_and_push_buffer_list (GstRtpOnvifTimestamp * self,
+    GstBufferList * list, gboolean end_contiguous)
+{
+  GstBuffer *buf;
+
+  /* Set the extension on the *first* buffer */
+  buf = gst_buffer_list_get (list, 0);
+  if (!handle_buffer (self, buf, end_contiguous)) {
+    gst_buffer_list_unref (list);
+    return GST_FLOW_ERROR;
+  }
+
+  return gst_pad_push_list (self->srcpad, list);
+}
+
+/* gst_pad_chain_list_default() refs the buffer when passing it to the chain
+ * function, making it not writable. We implement our own chain_list function
+ * to avoid having to copy each buffer. */
+static GstFlowReturn
+gst_rtp_onvif_timestamp_chain_list (GstPad * pad, GstObject * parent,
+    GstBufferList * list)
+{
+  GstRtpOnvifTimestamp *self = GST_RTP_ONVIF_TIMESTAMP (parent);
+  GstFlowReturn result = GST_FLOW_OK;
+  GstBuffer *buf;
+
+  if (!self->prop_set_e_bit) {
+    return handle_and_push_buffer_list (self, list, FALSE);
+  }
+
+  /* We have to wait for the *next* list before pushing this one */
+
+  if (self->list) {
+    /* push the *previous* list received */
+    buf = gst_buffer_list_get (list, 0);
+
+    result = handle_and_push_buffer_list (self, self->list,
+        GST_BUFFER_IS_DISCONT (buf));
+  }
+
+  /* Transfer ownership */
+  self->list = list;
+  return result;
+}
diff --git a/gst/onvif/gstrtponviftimestamp.h b/gst/onvif/gstrtponviftimestamp.h
new file mode 100644
index 000000000..d068846f1
--- /dev/null
+++ b/gst/onvif/gstrtponviftimestamp.h
@@ -0,0 +1,72 @@
+/*
+ * gstrtponviftimestamp.h
+ *
+ * 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/>.
+ */
+
+#ifndef __GST_RTP_ONVIF_TIMESTAMP_H__
+#define __GST_RTP_ONVIF_TIMESTAMP_H__
+
+
+#include <gst/gst.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define GST_TYPE_RTP_ONVIF_TIMESTAMP \
+  (gst_rtp_onvif_timestamp_get_type())
+#define GST_RTP_ONVIF_TIMESTAMP(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RTP_ONVIF_TIMESTAMP,GstRtpOnvifTimestamp))
+#define GST_RTP_ONVIF_TIMESTAMP_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RTP_ONVIF_TIMESTAMP,GstRtpOnvifTimestampClass))
+#define GST_IS_RTP_ONVIF_TIMESTAMP(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RTP_ONVIF_TIMESTAMP))
+#define GST_IS_RTP_ONVIF_TIMESTAMP_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RTP_ONVIF_TIMESTAMP))
+
+typedef struct _GstRtpOnvifTimestamp GstRtpOnvifTimestamp;
+typedef struct _GstRtpOnvifTimestampClass GstRtpOnvifTimestampClass;
+
+struct _GstRtpOnvifTimestamp {
+  GstElement element;
+
+  /* pads */
+  GstPad *sinkpad,*srcpad;
+
+  guint64 prop_ntp_offset;
+  guint prop_cseq;
+  gboolean prop_set_e_bit;
+
+  GstSegment segment;
+  gboolean received_segment;
+  /* Buffer waiting to be handled, only used if prop_set_e_bit is TRUE */
+  GstBuffer *buffer;
+  GstBufferList *list;
+};
+
+struct _GstRtpOnvifTimestampClass {
+  GstElementClass parent_class;
+};
+
+GType gst_rtp_onvif_timestamp_get_type(void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __GST_RTP_ONVIF_TIMESTAMP_H__ */