gst/rtp/gstrtpmpvpay.c - imx-gst-plugins-good - Git at Google

 /* GStreamer
  * Copyright (C) <2007> Thijs Vermeir <thijsvermeir@gmail.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., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <stdlib.h>
 #include <string.h>
 #include <gst/rtp/gstrtpbuffer.h>
 #include <gst/video/video.h>

 #include "gstrtpmpvpay.h"
 #include "gstrtputils.h"

 GST_DEBUG_CATEGORY_STATIC (rtpmpvpay_debug);
 #define GST_CAT_DEFAULT (rtpmpvpay_debug)

 static GstStaticPadTemplate gst_rtp_mpv_pay_sink_template =
 GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("video/mpeg, "
         "mpegversion = (int) 2, systemstream = (boolean) FALSE")
     );

 static GstStaticPadTemplate gst_rtp_mpv_pay_src_template =
     GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("application/x-rtp, "
         "media = (string) \"video\", "
         "payload = (int) " GST_RTP_PAYLOAD_MPV_STRING ", "
         "clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\"; "
         "application/x-rtp, "
         "media = (string) \"video\", "
         "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
         "clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\"")
     );

 static GstStateChangeReturn gst_rtp_mpv_pay_change_state (GstElement * element,
     GstStateChange transition);

 static void gst_rtp_mpv_pay_finalize (GObject * object);

 static GstFlowReturn gst_rtp_mpv_pay_flush (GstRTPMPVPay * rtpmpvpay);
 static gboolean gst_rtp_mpv_pay_setcaps (GstRTPBasePayload * payload,
     GstCaps * caps);
 static GstFlowReturn gst_rtp_mpv_pay_handle_buffer (GstRTPBasePayload *
     payload, GstBuffer * buffer);
 static gboolean gst_rtp_mpv_pay_sink_event (GstRTPBasePayload * payload,
     GstEvent * event);

 #define gst_rtp_mpv_pay_parent_class parent_class
 G_DEFINE_TYPE (GstRTPMPVPay, gst_rtp_mpv_pay, GST_TYPE_RTP_BASE_PAYLOAD);

 static void
 gst_rtp_mpv_pay_class_init (GstRTPMPVPayClass * klass)
 {
   GObjectClass *gobject_class;
   GstElementClass *gstelement_class;
   GstRTPBasePayloadClass *gstrtpbasepayload_class;

   gobject_class = (GObjectClass *) klass;
   gstelement_class = (GstElementClass *) klass;
   gstrtpbasepayload_class = (GstRTPBasePayloadClass *) klass;

   gobject_class->finalize = gst_rtp_mpv_pay_finalize;

   gstelement_class->change_state = gst_rtp_mpv_pay_change_state;

   gst_element_class_add_static_pad_template (gstelement_class,
       &gst_rtp_mpv_pay_sink_template);
   gst_element_class_add_static_pad_template (gstelement_class,
       &gst_rtp_mpv_pay_src_template);

   gst_element_class_set_static_metadata (gstelement_class,
       "RTP MPEG2 ES video payloader", "Codec/Payloader/Network/RTP",
       "Payload-encodes MPEG2 ES into RTP packets (RFC 2250)",
       "Thijs Vermeir <thijsvermeir@gmail.com>");

   gstrtpbasepayload_class->set_caps = gst_rtp_mpv_pay_setcaps;
   gstrtpbasepayload_class->handle_buffer = gst_rtp_mpv_pay_handle_buffer;
   gstrtpbasepayload_class->sink_event = gst_rtp_mpv_pay_sink_event;

   GST_DEBUG_CATEGORY_INIT (rtpmpvpay_debug, "rtpmpvpay", 0,
       "MPEG2 ES Video RTP Payloader");
 }

 static void
 gst_rtp_mpv_pay_init (GstRTPMPVPay * rtpmpvpay)
 {
   GST_RTP_BASE_PAYLOAD (rtpmpvpay)->clock_rate = 90000;
   GST_RTP_BASE_PAYLOAD_PT (rtpmpvpay) = GST_RTP_PAYLOAD_MPV;

   rtpmpvpay->adapter = gst_adapter_new ();
 }

 static void
 gst_rtp_mpv_pay_finalize (GObject * object)
 {
   GstRTPMPVPay *rtpmpvpay;

   rtpmpvpay = GST_RTP_MPV_PAY (object);

   g_object_unref (rtpmpvpay->adapter);
   rtpmpvpay->adapter = NULL;

   G_OBJECT_CLASS (parent_class)->finalize (object);
 }

 static void
 gst_rtp_mpv_pay_reset (GstRTPMPVPay * pay)
 {
   pay->first_ts = -1;
   pay->duration = 0;
   gst_adapter_clear (pay->adapter);
   GST_DEBUG_OBJECT (pay, "reset depayloader");
 }

 static gboolean
 gst_rtp_mpv_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
 {
   gst_rtp_base_payload_set_options (payload, "video",
       payload->pt != GST_RTP_PAYLOAD_MPV, "MPV", 90000);
   return gst_rtp_base_payload_set_outcaps (payload, NULL);
 }

 static gboolean
 gst_rtp_mpv_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event)
 {
   gboolean ret;
   GstRTPMPVPay *rtpmpvpay;

   rtpmpvpay = GST_RTP_MPV_PAY (payload);

   switch (GST_EVENT_TYPE (event)) {
     case GST_EVENT_EOS:
       /* make sure we push the last packets in the adapter on EOS */
       gst_rtp_mpv_pay_flush (rtpmpvpay);
       break;
     case GST_EVENT_FLUSH_STOP:
       gst_rtp_mpv_pay_reset (rtpmpvpay);
       break;
     default:
       break;
   }

   ret = GST_RTP_BASE_PAYLOAD_CLASS (parent_class)->sink_event (payload, event);

   return ret;
 }

 #define RTP_HEADER_LEN 12

 static GstFlowReturn
 gst_rtp_mpv_pay_flush (GstRTPMPVPay * rtpmpvpay)
 {
   GstFlowReturn ret;
   guint avail;
   GstBufferList *list;
   GstBuffer *outbuf;

   guint8 *payload;

   avail = gst_adapter_available (rtpmpvpay->adapter);

   ret = GST_FLOW_OK;

   GST_DEBUG_OBJECT (rtpmpvpay, "available %u", avail);
   if (avail == 0)
     return GST_FLOW_OK;

   list =
       gst_buffer_list_new_sized (avail / (GST_RTP_BASE_PAYLOAD_MTU (rtpmpvpay) -
           RTP_HEADER_LEN) + 1);

   while (avail > 0) {
     guint towrite;
     guint packet_len;
     guint payload_len;
     GstRTPBuffer rtp = { NULL };
     GstBuffer *paybuf;

     packet_len = gst_rtp_buffer_calc_packet_len (avail + 4, 0, 0);

     towrite = MIN (packet_len, GST_RTP_BASE_PAYLOAD_MTU (rtpmpvpay));

     payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0);

     outbuf = gst_rtp_buffer_new_allocate (4, 0, 0);

     payload_len -= 4;

     gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);

     payload = gst_rtp_buffer_get_payload (&rtp);
     /* enable MPEG Video-specific header
      *
      *  0                   1                   2                   3
      *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      * |    MBZ  |T|         TR        | |N|S|B|E|  P  | | BFC | | FFC |
      * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      *                                  AN              FBV     FFV
      */

     /* fill in the MPEG Video-specific header
      * data is set to 0x0 here
      */
     memset (payload, 0x0, 4);

     avail -= payload_len;

     gst_rtp_buffer_set_marker (&rtp, avail == 0);
     gst_rtp_buffer_unmap (&rtp);

     paybuf = gst_adapter_take_buffer_fast (rtpmpvpay->adapter, payload_len);
     gst_rtp_copy_video_meta (rtpmpvpay, outbuf, paybuf);
     outbuf = gst_buffer_append (outbuf, paybuf);

     GST_DEBUG_OBJECT (rtpmpvpay, "Adding buffer");

     GST_BUFFER_PTS (outbuf) = rtpmpvpay->first_ts;
     gst_buffer_list_add (list, outbuf);
   }

   ret = gst_rtp_base_payload_push_list (GST_RTP_BASE_PAYLOAD (rtpmpvpay), list);

   return ret;
 }

 static GstFlowReturn
 gst_rtp_mpv_pay_handle_buffer (GstRTPBasePayload * basepayload,
     GstBuffer * buffer)
 {
   GstRTPMPVPay *rtpmpvpay;
   guint avail, packet_len;
   GstClockTime timestamp, duration;
   GstFlowReturn ret = GST_FLOW_OK;

   rtpmpvpay = GST_RTP_MPV_PAY (basepayload);

   timestamp = GST_BUFFER_PTS (buffer);
   duration = GST_BUFFER_DURATION (buffer);

   if (GST_BUFFER_IS_DISCONT (buffer)) {
     GST_DEBUG_OBJECT (rtpmpvpay, "DISCONT");
     gst_rtp_mpv_pay_reset (rtpmpvpay);
   }

   avail = gst_adapter_available (rtpmpvpay->adapter);

   if (duration == -1)
     duration = 0;

   if (rtpmpvpay->first_ts == GST_CLOCK_TIME_NONE || avail == 0)
     rtpmpvpay->first_ts = timestamp;

   if (avail == 0) {
     rtpmpvpay->duration = duration;
   } else {
     rtpmpvpay->duration += duration;
   }

   gst_adapter_push (rtpmpvpay->adapter, buffer);
   avail = gst_adapter_available (rtpmpvpay->adapter);

   /* get packet length of previous data and this new data,
    * payload length includes a 4 byte MPEG video-specific header */
   packet_len = gst_rtp_buffer_calc_packet_len (avail, 4, 0);
   GST_LOG_OBJECT (rtpmpvpay, "available %d, rtp packet length %d", avail,
       packet_len);

   if (gst_rtp_base_payload_is_filled (basepayload,
           packet_len, rtpmpvpay->duration)) {
     ret = gst_rtp_mpv_pay_flush (rtpmpvpay);
   } else {
     rtpmpvpay->first_ts = timestamp;
   }

   return ret;
 }

 static GstStateChangeReturn
 gst_rtp_mpv_pay_change_state (GstElement * element, GstStateChange transition)
 {
   GstRTPMPVPay *rtpmpvpay;
   GstStateChangeReturn ret;

   rtpmpvpay = GST_RTP_MPV_PAY (element);

   switch (transition) {
     case GST_STATE_CHANGE_READY_TO_PAUSED:
       gst_rtp_mpv_pay_reset (rtpmpvpay);
       break;
     default:
       break;
   }

   ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);

   switch (transition) {
     case GST_STATE_CHANGE_PAUSED_TO_READY:
       gst_rtp_mpv_pay_reset (rtpmpvpay);
       break;
     default:
       break;
   }
   return ret;
 }


 gboolean
 gst_rtp_mpv_pay_plugin_init (GstPlugin * plugin)
 {
   return gst_element_register (plugin, "rtpmpvpay",
       GST_RANK_SECONDARY, GST_TYPE_RTP_MPV_PAY);
 }
	/* GStreamer
	* Copyright (C) <2007> Thijs Vermeir <thijsvermeir@gmail.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., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <stdlib.h>
	#include <string.h>
	#include <gst/rtp/gstrtpbuffer.h>
	#include <gst/video/video.h>

	#include "gstrtpmpvpay.h"
	#include "gstrtputils.h"

	GST_DEBUG_CATEGORY_STATIC (rtpmpvpay_debug);
	#define GST_CAT_DEFAULT (rtpmpvpay_debug)

	static GstStaticPadTemplate gst_rtp_mpv_pay_sink_template =
	GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("video/mpeg, "
	"mpegversion = (int) 2, systemstream = (boolean) FALSE")
	);

	static GstStaticPadTemplate gst_rtp_mpv_pay_src_template =
	GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("application/x-rtp, "
	"media = (string) \"video\", "
	"payload = (int) " GST_RTP_PAYLOAD_MPV_STRING ", "
	"clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\"; "
	"application/x-rtp, "
	"media = (string) \"video\", "
	"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
	"clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\"")
	);

	static GstStateChangeReturn gst_rtp_mpv_pay_change_state (GstElement * element,
	GstStateChange transition);

	static void gst_rtp_mpv_pay_finalize (GObject * object);

	static GstFlowReturn gst_rtp_mpv_pay_flush (GstRTPMPVPay * rtpmpvpay);
	static gboolean gst_rtp_mpv_pay_setcaps (GstRTPBasePayload * payload,
	GstCaps * caps);
	static GstFlowReturn gst_rtp_mpv_pay_handle_buffer (GstRTPBasePayload *
	payload, GstBuffer * buffer);
	static gboolean gst_rtp_mpv_pay_sink_event (GstRTPBasePayload * payload,
	GstEvent * event);

	#define gst_rtp_mpv_pay_parent_class parent_class
	G_DEFINE_TYPE (GstRTPMPVPay, gst_rtp_mpv_pay, GST_TYPE_RTP_BASE_PAYLOAD);

	static void
	gst_rtp_mpv_pay_class_init (GstRTPMPVPayClass * klass)
	{
	GObjectClass *gobject_class;
	GstElementClass *gstelement_class;
	GstRTPBasePayloadClass *gstrtpbasepayload_class;

	gobject_class = (GObjectClass *) klass;
	gstelement_class = (GstElementClass *) klass;
	gstrtpbasepayload_class = (GstRTPBasePayloadClass *) klass;

	gobject_class->finalize = gst_rtp_mpv_pay_finalize;

	gstelement_class->change_state = gst_rtp_mpv_pay_change_state;

	gst_element_class_add_static_pad_template (gstelement_class,
	&gst_rtp_mpv_pay_sink_template);
	gst_element_class_add_static_pad_template (gstelement_class,
	&gst_rtp_mpv_pay_src_template);

	gst_element_class_set_static_metadata (gstelement_class,
	"RTP MPEG2 ES video payloader", "Codec/Payloader/Network/RTP",
	"Payload-encodes MPEG2 ES into RTP packets (RFC 2250)",
	"Thijs Vermeir <thijsvermeir@gmail.com>");

	gstrtpbasepayload_class->set_caps = gst_rtp_mpv_pay_setcaps;
	gstrtpbasepayload_class->handle_buffer = gst_rtp_mpv_pay_handle_buffer;
	gstrtpbasepayload_class->sink_event = gst_rtp_mpv_pay_sink_event;

	GST_DEBUG_CATEGORY_INIT (rtpmpvpay_debug, "rtpmpvpay", 0,
	"MPEG2 ES Video RTP Payloader");
	}

	static void
	gst_rtp_mpv_pay_init (GstRTPMPVPay * rtpmpvpay)
	{
	GST_RTP_BASE_PAYLOAD (rtpmpvpay)->clock_rate = 90000;
	GST_RTP_BASE_PAYLOAD_PT (rtpmpvpay) = GST_RTP_PAYLOAD_MPV;

	rtpmpvpay->adapter = gst_adapter_new ();
	}

	static void
	gst_rtp_mpv_pay_finalize (GObject * object)
	{
	GstRTPMPVPay *rtpmpvpay;

	rtpmpvpay = GST_RTP_MPV_PAY (object);

	g_object_unref (rtpmpvpay->adapter);
	rtpmpvpay->adapter = NULL;

	G_OBJECT_CLASS (parent_class)->finalize (object);
	}

	static void
	gst_rtp_mpv_pay_reset (GstRTPMPVPay * pay)
	{
	pay->first_ts = -1;
	pay->duration = 0;
	gst_adapter_clear (pay->adapter);
	GST_DEBUG_OBJECT (pay, "reset depayloader");
	}

	static gboolean
	gst_rtp_mpv_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps)
	{
	gst_rtp_base_payload_set_options (payload, "video",
	payload->pt != GST_RTP_PAYLOAD_MPV, "MPV", 90000);
	return gst_rtp_base_payload_set_outcaps (payload, NULL);
	}

	static gboolean
	gst_rtp_mpv_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event)
	{
	gboolean ret;
	GstRTPMPVPay *rtpmpvpay;

	rtpmpvpay = GST_RTP_MPV_PAY (payload);

	switch (GST_EVENT_TYPE (event)) {
	case GST_EVENT_EOS:
	/* make sure we push the last packets in the adapter on EOS */
	gst_rtp_mpv_pay_flush (rtpmpvpay);
	break;
	case GST_EVENT_FLUSH_STOP:
	gst_rtp_mpv_pay_reset (rtpmpvpay);
	break;
	default:
	break;
	}

	ret = GST_RTP_BASE_PAYLOAD_CLASS (parent_class)->sink_event (payload, event);

	return ret;
	}

	#define RTP_HEADER_LEN 12

	static GstFlowReturn
	gst_rtp_mpv_pay_flush (GstRTPMPVPay * rtpmpvpay)
	{
	GstFlowReturn ret;
	guint avail;
	GstBufferList *list;
	GstBuffer *outbuf;

	guint8 *payload;

	avail = gst_adapter_available (rtpmpvpay->adapter);

	ret = GST_FLOW_OK;

	GST_DEBUG_OBJECT (rtpmpvpay, "available %u", avail);
	if (avail == 0)
	return GST_FLOW_OK;

	list =
	gst_buffer_list_new_sized (avail / (GST_RTP_BASE_PAYLOAD_MTU (rtpmpvpay) -
	RTP_HEADER_LEN) + 1);

	while (avail > 0) {
	guint towrite;
	guint packet_len;
	guint payload_len;
	GstRTPBuffer rtp = { NULL };
	GstBuffer *paybuf;

	packet_len = gst_rtp_buffer_calc_packet_len (avail + 4, 0, 0);

	towrite = MIN (packet_len, GST_RTP_BASE_PAYLOAD_MTU (rtpmpvpay));

	payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0);

	outbuf = gst_rtp_buffer_new_allocate (4, 0, 0);

	payload_len -= 4;

	gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);

	payload = gst_rtp_buffer_get_payload (&rtp);
	/* enable MPEG Video-specific header
	*
	* 0 1 2 3
	* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	* \| MBZ \|T\| TR \| \|N\|S\|B\|E\| P \| \| BFC \| \| FFC \|
	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	* AN FBV FFV
	*/

	/* fill in the MPEG Video-specific header
	* data is set to 0x0 here
	*/
	memset (payload, 0x0, 4);

	avail -= payload_len;

	gst_rtp_buffer_set_marker (&rtp, avail == 0);
	gst_rtp_buffer_unmap (&rtp);

	paybuf = gst_adapter_take_buffer_fast (rtpmpvpay->adapter, payload_len);
	gst_rtp_copy_video_meta (rtpmpvpay, outbuf, paybuf);
	outbuf = gst_buffer_append (outbuf, paybuf);

	GST_DEBUG_OBJECT (rtpmpvpay, "Adding buffer");

	GST_BUFFER_PTS (outbuf) = rtpmpvpay->first_ts;
	gst_buffer_list_add (list, outbuf);
	}

	ret = gst_rtp_base_payload_push_list (GST_RTP_BASE_PAYLOAD (rtpmpvpay), list);

	return ret;
	}

	static GstFlowReturn
	gst_rtp_mpv_pay_handle_buffer (GstRTPBasePayload * basepayload,
	GstBuffer * buffer)
	{
	GstRTPMPVPay *rtpmpvpay;
	guint avail, packet_len;
	GstClockTime timestamp, duration;
	GstFlowReturn ret = GST_FLOW_OK;

	rtpmpvpay = GST_RTP_MPV_PAY (basepayload);

	timestamp = GST_BUFFER_PTS (buffer);
	duration = GST_BUFFER_DURATION (buffer);

	if (GST_BUFFER_IS_DISCONT (buffer)) {
	GST_DEBUG_OBJECT (rtpmpvpay, "DISCONT");
	gst_rtp_mpv_pay_reset (rtpmpvpay);
	}

	avail = gst_adapter_available (rtpmpvpay->adapter);

	if (duration == -1)
	duration = 0;

	if (rtpmpvpay->first_ts == GST_CLOCK_TIME_NONE \|\| avail == 0)
	rtpmpvpay->first_ts = timestamp;

	if (avail == 0) {
	rtpmpvpay->duration = duration;
	} else {
	rtpmpvpay->duration += duration;
	}

	gst_adapter_push (rtpmpvpay->adapter, buffer);
	avail = gst_adapter_available (rtpmpvpay->adapter);

	/* get packet length of previous data and this new data,
	* payload length includes a 4 byte MPEG video-specific header */
	packet_len = gst_rtp_buffer_calc_packet_len (avail, 4, 0);
	GST_LOG_OBJECT (rtpmpvpay, "available %d, rtp packet length %d", avail,
	packet_len);

	if (gst_rtp_base_payload_is_filled (basepayload,
	packet_len, rtpmpvpay->duration)) {
	ret = gst_rtp_mpv_pay_flush (rtpmpvpay);
	} else {
	rtpmpvpay->first_ts = timestamp;
	}

	return ret;
	}

	static GstStateChangeReturn
	gst_rtp_mpv_pay_change_state (GstElement * element, GstStateChange transition)
	{
	GstRTPMPVPay *rtpmpvpay;
	GstStateChangeReturn ret;

	rtpmpvpay = GST_RTP_MPV_PAY (element);

	switch (transition) {
	case GST_STATE_CHANGE_READY_TO_PAUSED:
	gst_rtp_mpv_pay_reset (rtpmpvpay);
	break;
	default:
	break;
	}

	ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);

	switch (transition) {
	case GST_STATE_CHANGE_PAUSED_TO_READY:
	gst_rtp_mpv_pay_reset (rtpmpvpay);
	break;
	default:
	break;
	}
	return ret;
	}


	gboolean
	gst_rtp_mpv_pay_plugin_init (GstPlugin * plugin)
	{
	return gst_element_register (plugin, "rtpmpvpay",
	GST_RANK_SECONDARY, GST_TYPE_RTP_MPV_PAY);
	}