/*
* RTP Demux element
*
* Copyright (C) 2005 Nokia Corporation.
* @author Kai Vehmanen <kai.vehmanen@nokia.com>
*
* Loosely based on GStreamer gstdecodebin
* Copyright (C) <2004> Wim Taymans <wim.taymans@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.
*/
/**
* SECTION:element-rtpptdemux
*
* rtpptdemux acts as a demuxer for RTP packets based on the payload type of
* the packets. Its main purpose is to allow an application to easily receive
* and decode an RTP stream with multiple payload types.
*
* For each payload type that is detected, a new pad will be created and the
* #GstRtpPtDemux::new-payload-type signal will be emitted. When the payload for
* the RTP stream changes, the #GstRtpPtDemux::payload-type-change signal will be
* emitted.
*
* The element will try to set complete and unique application/x-rtp caps
* on the output pads based on the result of the #GstRtpPtDemux::request-pt-map
* signal.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch-1.0 udpsrc caps="application/x-rtp" ! rtpptdemux ! fakesink
* ]| Takes an RTP stream and send the RTP packets with the first detected
* payload type to fakesink, discarding the other payload types.
* </refsect2>
*/
/*
* Contributors:
* Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>
*/
/*
* Status:
* - works with the test_rtpdemux.c tool
*
* Check:
* - is emitting a signal enough, or should we
* use GstEvent to notify downstream elements
* of the new packet... no?
*
* Notes:
* - emits event both for new PTs, and whenever
* a PT is changed
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtpptdemux.h"
/* generic templates */
static GstStaticPadTemplate rtp_pt_demux_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp")
);
static GstStaticPadTemplate rtp_pt_demux_src_template =
GST_STATIC_PAD_TEMPLATE ("src_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS ("application/x-rtp, " "payload = (int) [ 0, 255 ]")
);
GST_DEBUG_CATEGORY_STATIC (gst_rtp_pt_demux_debug);
#define GST_CAT_DEFAULT gst_rtp_pt_demux_debug
/*
* Item for storing GstPad<->pt pairs.
*/
struct _GstRtpPtDemuxPad
{
GstPad *pad; /**< pointer to the actual pad */
gint pt; /**< RTP payload-type attached to pad */
gboolean newcaps;
};
/* signals */
enum
{
SIGNAL_REQUEST_PT_MAP,
SIGNAL_NEW_PAYLOAD_TYPE,
SIGNAL_PAYLOAD_TYPE_CHANGE,
SIGNAL_CLEAR_PT_MAP,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_IGNORED_PTS,
};
#define gst_rtp_pt_demux_parent_class parent_class
G_DEFINE_TYPE (GstRtpPtDemux, gst_rtp_pt_demux, GST_TYPE_ELEMENT);
static void gst_rtp_pt_demux_finalize (GObject * object);
static void gst_rtp_pt_demux_release (GstRtpPtDemux * ptdemux);
static gboolean gst_rtp_pt_demux_setup (GstRtpPtDemux * ptdemux);
static gboolean gst_rtp_pt_demux_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstFlowReturn gst_rtp_pt_demux_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static GstStateChangeReturn gst_rtp_pt_demux_change_state (GstElement * element,
GstStateChange transition);
static void gst_rtp_pt_demux_clear_pt_map (GstRtpPtDemux * rtpdemux);
static GstPad *find_pad_for_pt (GstRtpPtDemux * rtpdemux, guint8 pt);
static gboolean gst_rtp_pt_demux_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static guint gst_rtp_pt_demux_signals[LAST_SIGNAL] = { 0 };
static void
gst_rtp_pt_demux_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRtpPtDemux *rtpptdemux = GST_RTP_PT_DEMUX (object);
switch (prop_id) {
case PROP_IGNORED_PTS:
g_value_copy (value, &rtpptdemux->ignored_pts);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_pt_demux_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRtpPtDemux *rtpptdemux = GST_RTP_PT_DEMUX (object);
switch (prop_id) {
case PROP_IGNORED_PTS:
g_value_copy (&rtpptdemux->ignored_pts, value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_pt_demux_class_init (GstRtpPtDemuxClass * klass)
{
GObjectClass *gobject_klass;
GstElementClass *gstelement_klass;
gobject_klass = (GObjectClass *) klass;
gstelement_klass = (GstElementClass *) klass;
/**
* GstRtpPtDemux::request-pt-map:
* @demux: the object which received the signal
* @pt: the payload type
*
* Request the payload type as #GstCaps for @pt.
*/
gst_rtp_pt_demux_signals[SIGNAL_REQUEST_PT_MAP] =
g_signal_new ("request-pt-map", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpPtDemuxClass, request_pt_map),
NULL, NULL, g_cclosure_marshal_generic, GST_TYPE_CAPS, 1, G_TYPE_UINT);
/**
* GstRtpPtDemux::new-payload-type:
* @demux: the object which received the signal
* @pt: the payload type
* @pad: the pad with the new payload
*
* Emited when a new payload type pad has been created in @demux.
*/
gst_rtp_pt_demux_signals[SIGNAL_NEW_PAYLOAD_TYPE] =
g_signal_new ("new-payload-type", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpPtDemuxClass, new_payload_type),
NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 2, G_TYPE_UINT,
GST_TYPE_PAD);
/**
* GstRtpPtDemux::payload-type-change:
* @demux: the object which received the signal
* @pt: the new payload type
*
* Emited when the payload type changed.
*/
gst_rtp_pt_demux_signals[SIGNAL_PAYLOAD_TYPE_CHANGE] =
g_signal_new ("payload-type-change", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpPtDemuxClass,
payload_type_change), NULL, NULL, g_cclosure_marshal_VOID__UINT,
G_TYPE_NONE, 1, G_TYPE_UINT);
/**
* GstRtpPtDemux::clear-pt-map:
* @demux: the object which received the signal
*
* The application can call this signal to instruct the element to discard the
* currently cached payload type map.
*/
gst_rtp_pt_demux_signals[SIGNAL_CLEAR_PT_MAP] =
g_signal_new ("clear-pt-map", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_ACTION | G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpPtDemuxClass,
clear_pt_map), NULL, NULL, g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0, G_TYPE_NONE);
gobject_klass->set_property = gst_rtp_pt_demux_set_property;
gobject_klass->get_property = gst_rtp_pt_demux_get_property;
/**
* GstRtpPtDemux:ignored-payload-types:
*
* If specified, packets with an ignored payload type will be dropped,
* instead of causing a new pad to be exposed for these to be pushed on.
*
* This is for example useful to drop FEC protection packets, as they
* need to go through the #GstRtpJitterBuffer, but cease to be useful
* past that point, #GstRtpBin will make use of this property for that
* purpose.
*
* Since: 1.14
*/
g_object_class_install_property (gobject_klass, PROP_IGNORED_PTS,
gst_param_spec_array ("ignored-payload-types",
"Ignored payload types",
"Packets with these payload types will be dropped",
g_param_spec_int ("payload-types", "payload-types", "Payload types",
0, G_MAXINT, 0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS),
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gobject_klass->finalize = gst_rtp_pt_demux_finalize;
gstelement_klass->change_state =
GST_DEBUG_FUNCPTR (gst_rtp_pt_demux_change_state);
klass->clear_pt_map = GST_DEBUG_FUNCPTR (gst_rtp_pt_demux_clear_pt_map);
gst_element_class_add_static_pad_template (gstelement_klass,
&rtp_pt_demux_sink_template);
gst_element_class_add_static_pad_template (gstelement_klass,
&rtp_pt_demux_src_template);
gst_element_class_set_static_metadata (gstelement_klass, "RTP Demux",
"Demux/Network/RTP",
"Parses codec streams transmitted in the same RTP session",
"Kai Vehmanen <kai.vehmanen@nokia.com>");
GST_DEBUG_CATEGORY_INIT (gst_rtp_pt_demux_debug,
"rtpptdemux", 0, "RTP codec demuxer");
}
static void
gst_rtp_pt_demux_init (GstRtpPtDemux * ptdemux)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (ptdemux);
ptdemux->sink =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"sink"), "sink");
g_assert (ptdemux->sink != NULL);
gst_pad_set_chain_function (ptdemux->sink, gst_rtp_pt_demux_chain);
gst_pad_set_event_function (ptdemux->sink, gst_rtp_pt_demux_sink_event);
gst_element_add_pad (GST_ELEMENT (ptdemux), ptdemux->sink);
g_value_init (&ptdemux->ignored_pts, GST_TYPE_ARRAY);
}
static void
gst_rtp_pt_demux_finalize (GObject * object)
{
gst_rtp_pt_demux_release (GST_RTP_PT_DEMUX (object));
g_value_unset (&GST_RTP_PT_DEMUX (object)->ignored_pts);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstCaps *
gst_rtp_pt_demux_get_caps (GstRtpPtDemux * rtpdemux, guint pt)
{
GstCaps *caps;
GValue ret = { 0 };
GValue args[2] = { {0}, {0} };
GstCaps *sink_caps;
/* figure out the caps */
g_value_init (&args[0], GST_TYPE_ELEMENT);
g_value_set_object (&args[0], rtpdemux);
g_value_init (&args[1], G_TYPE_UINT);
g_value_set_uint (&args[1], pt);
g_value_init (&ret, GST_TYPE_CAPS);
g_value_set_boxed (&ret, NULL);
g_signal_emitv (args, gst_rtp_pt_demux_signals[SIGNAL_REQUEST_PT_MAP], 0,
&ret);
g_value_unset (&args[0]);
g_value_unset (&args[1]);
caps = g_value_dup_boxed (&ret);
g_value_unset (&ret);
sink_caps = gst_pad_get_current_caps (rtpdemux->sink);
if (sink_caps) {
if (caps == NULL) {
caps = gst_caps_ref (sink_caps);
} else {
GstStructure *s1;
GstStructure *s2;
guint ssrc;
caps = gst_caps_make_writable (caps);
s1 = gst_caps_get_structure (sink_caps, 0);
s2 = gst_caps_get_structure (caps, 0);
gst_structure_get_uint (s1, "ssrc", &ssrc);
gst_structure_set (s2, "ssrc", G_TYPE_UINT, ssrc, NULL);
}
gst_caps_unref (sink_caps);
}
GST_DEBUG ("pt %d, got caps %" GST_PTR_FORMAT, pt, caps);
return caps;
}
static void
gst_rtp_pt_demux_clear_pt_map (GstRtpPtDemux * rtpdemux)
{
GSList *walk;
GST_OBJECT_LOCK (rtpdemux);
GST_DEBUG ("clearing pt map");
for (walk = rtpdemux->srcpads; walk; walk = g_slist_next (walk)) {
GstRtpPtDemuxPad *pad = walk->data;
pad->newcaps = TRUE;
}
GST_OBJECT_UNLOCK (rtpdemux);
}
static gboolean
need_caps_for_pt (GstRtpPtDemux * rtpdemux, guint8 pt)
{
GSList *walk;
gboolean ret = FALSE;
GST_OBJECT_LOCK (rtpdemux);
for (walk = rtpdemux->srcpads; walk; walk = g_slist_next (walk)) {
GstRtpPtDemuxPad *pad = walk->data;
if (pad->pt == pt) {
ret = pad->newcaps;
}
}
GST_OBJECT_UNLOCK (rtpdemux);
return ret;
}
static void
clear_newcaps_for_pt (GstRtpPtDemux * rtpdemux, guint8 pt)
{
GSList *walk;
GST_OBJECT_LOCK (rtpdemux);
for (walk = rtpdemux->srcpads; walk; walk = g_slist_next (walk)) {
GstRtpPtDemuxPad *pad = walk->data;
if (pad->pt == pt) {
pad->newcaps = FALSE;
break;
}
}
GST_OBJECT_UNLOCK (rtpdemux);
}
static gboolean
forward_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data)
{
GstPad *srcpad = GST_PAD_CAST (user_data);
/* Stream start and caps have already been pushed */
if (GST_EVENT_TYPE (*event) >= GST_EVENT_SEGMENT)
gst_pad_push_event (srcpad, gst_event_ref (*event));
return TRUE;
}
static gboolean
gst_rtp_pt_demux_pt_is_ignored (GstRtpPtDemux * ptdemux, guint8 pt)
{
gboolean ret = FALSE;
guint i;
for (i = 0; i < gst_value_array_get_size (&ptdemux->ignored_pts); i++) {
const GValue *tmp = gst_value_array_get_value (&ptdemux->ignored_pts, i);
if (g_value_get_int (tmp) == pt) {
ret = TRUE;
break;
}
}
return ret;
}
static GstFlowReturn
gst_rtp_pt_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstRtpPtDemux *rtpdemux;
guint8 pt;
GstPad *srcpad;
GstCaps *caps;
GstRTPBuffer rtp = { NULL };
rtpdemux = GST_RTP_PT_DEMUX (parent);
if (!gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp))
goto invalid_buffer;
pt = gst_rtp_buffer_get_payload_type (&rtp);
gst_rtp_buffer_unmap (&rtp);
if (gst_rtp_pt_demux_pt_is_ignored (rtpdemux, pt))
goto ignored;
GST_DEBUG_OBJECT (rtpdemux, "received buffer for pt %d", pt);
srcpad = find_pad_for_pt (rtpdemux, pt);
if (srcpad == NULL) {
/* new PT, create a src pad */
GstRtpPtDemuxPad *rtpdemuxpad;
GstElementClass *klass;
GstPadTemplate *templ;
gchar *padname;
caps = gst_rtp_pt_demux_get_caps (rtpdemux, pt);
if (!caps)
goto no_caps;
if (gst_rtp_pt_demux_pt_is_ignored (rtpdemux, pt))
goto ignored;
klass = GST_ELEMENT_GET_CLASS (rtpdemux);
templ = gst_element_class_get_pad_template (klass, "src_%u");
padname = g_strdup_printf ("src_%u", pt);
srcpad = gst_pad_new_from_template (templ, padname);
gst_pad_use_fixed_caps (srcpad);
g_free (padname);
gst_pad_set_event_function (srcpad, gst_rtp_pt_demux_src_event);
GST_DEBUG ("Adding pt=%d to the list.", pt);
rtpdemuxpad = g_slice_new0 (GstRtpPtDemuxPad);
rtpdemuxpad->pt = pt;
rtpdemuxpad->newcaps = FALSE;
rtpdemuxpad->pad = srcpad;
gst_object_ref (srcpad);
GST_OBJECT_LOCK (rtpdemux);
rtpdemux->srcpads = g_slist_append (rtpdemux->srcpads, rtpdemuxpad);
GST_OBJECT_UNLOCK (rtpdemux);
gst_pad_set_active (srcpad, TRUE);
/* First push the stream-start event, it must always come first */
gst_pad_push_event (srcpad,
gst_pad_get_sticky_event (rtpdemux->sink, GST_EVENT_STREAM_START, 0));
/* Then caps event is sent */
caps = gst_caps_make_writable (caps);
gst_caps_set_simple (caps, "payload", G_TYPE_INT, pt, NULL);
gst_pad_set_caps (srcpad, caps);
gst_caps_unref (caps);
/* First sticky events on sink pad are forwarded to the new src pad */
gst_pad_sticky_events_foreach (rtpdemux->sink, forward_sticky_events,
srcpad);
gst_element_add_pad (GST_ELEMENT_CAST (rtpdemux), srcpad);
GST_DEBUG ("emitting new-payload-type for pt %d", pt);
g_signal_emit (G_OBJECT (rtpdemux),
gst_rtp_pt_demux_signals[SIGNAL_NEW_PAYLOAD_TYPE], 0, pt, srcpad);
}
if (pt != rtpdemux->last_pt) {
gint emit_pt = pt;
/* our own signal with an extra flag that this is the only pad */
rtpdemux->last_pt = pt;
GST_DEBUG ("emitting payload-type-changed for pt %d", emit_pt);
g_signal_emit (G_OBJECT (rtpdemux),
gst_rtp_pt_demux_signals[SIGNAL_PAYLOAD_TYPE_CHANGE], 0, emit_pt);
}
while (need_caps_for_pt (rtpdemux, pt)) {
GST_DEBUG ("need new caps for %d", pt);
caps = gst_rtp_pt_demux_get_caps (rtpdemux, pt);
if (!caps)
goto no_caps;
clear_newcaps_for_pt (rtpdemux, pt);
caps = gst_caps_make_writable (caps);
gst_caps_set_simple (caps, "payload", G_TYPE_INT, pt, NULL);
gst_pad_set_caps (srcpad, caps);
gst_caps_unref (caps);
}
/* push to srcpad */
ret = gst_pad_push (srcpad, buf);
gst_object_unref (srcpad);
return ret;
ignored:
{
GST_DEBUG_OBJECT (rtpdemux, "Dropped buffer for pt %d", pt);
gst_buffer_unref (buf);
return GST_FLOW_OK;
}
/* ERRORS */
invalid_buffer:
{
/* this should not be fatal */
GST_ELEMENT_WARNING (rtpdemux, STREAM, DEMUX, (NULL),
("Dropping invalid RTP payload"));
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
no_caps:
{
GST_ELEMENT_ERROR (rtpdemux, STREAM, DECODE, (NULL),
("Could not get caps for payload"));
gst_buffer_unref (buf);
if (srcpad)
gst_object_unref (srcpad);
return GST_FLOW_ERROR;
}
}
static GstPad *
find_pad_for_pt (GstRtpPtDemux * rtpdemux, guint8 pt)
{
GstPad *respad = NULL;
GSList *walk;
GST_OBJECT_LOCK (rtpdemux);
for (walk = rtpdemux->srcpads; walk; walk = g_slist_next (walk)) {
GstRtpPtDemuxPad *pad = walk->data;
if (pad->pt == pt) {
respad = gst_object_ref (pad->pad);
break;
}
}
GST_OBJECT_UNLOCK (rtpdemux);
return respad;
}
static gboolean
gst_rtp_pt_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstRtpPtDemux *rtpdemux;
gboolean res = FALSE;
rtpdemux = GST_RTP_PT_DEMUX (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
gst_rtp_pt_demux_clear_pt_map (rtpdemux);
/* don't forward the event, we cleared the ptmap and on the next buffer we
* will add the pt to the caps and push a new caps event */
gst_event_unref (event);
res = TRUE;
break;
}
case GST_EVENT_CUSTOM_DOWNSTREAM:
{
const GstStructure *s;
s = gst_event_get_structure (event);
if (gst_structure_has_name (s, "GstRTPPacketLost")) {
GstPad *srcpad = find_pad_for_pt (rtpdemux, rtpdemux->last_pt);
if (srcpad) {
res = gst_pad_push_event (srcpad, event);
gst_object_unref (srcpad);
} else {
gst_event_unref (event);
}
} else {
res = gst_pad_event_default (pad, parent, event);
}
break;
}
default:
res = gst_pad_event_default (pad, parent, event);
break;
}
return res;
}
static gboolean
gst_rtp_pt_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstRtpPtDemux *demux;
const GstStructure *s;
demux = GST_RTP_PT_DEMUX (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_UPSTREAM:
case GST_EVENT_CUSTOM_BOTH:
case GST_EVENT_CUSTOM_BOTH_OOB:
s = gst_event_get_structure (event);
if (s && !gst_structure_has_field (s, "payload")) {
GSList *walk;
GST_OBJECT_LOCK (demux);
for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
GstRtpPtDemuxPad *dpad = (GstRtpPtDemuxPad *) walk->data;
if (dpad->pad == pad) {
GstStructure *ws;
event =
GST_EVENT_CAST (gst_mini_object_make_writable
(GST_MINI_OBJECT_CAST (event)));
ws = gst_event_writable_structure (event);
gst_structure_set (ws, "payload", G_TYPE_UINT, dpad->pt, NULL);
break;
}
}
GST_OBJECT_UNLOCK (demux);
}
break;
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
/*
* Reserves resources for the object.
*/
static gboolean
gst_rtp_pt_demux_setup (GstRtpPtDemux * ptdemux)
{
ptdemux->srcpads = NULL;
ptdemux->last_pt = 0xFFFF;
return TRUE;
}
/*
* Free resources for the object.
*/
static void
gst_rtp_pt_demux_release (GstRtpPtDemux * ptdemux)
{
GSList *tmppads;
GSList *walk;
GST_OBJECT_LOCK (ptdemux);
tmppads = ptdemux->srcpads;
ptdemux->srcpads = NULL;
GST_OBJECT_UNLOCK (ptdemux);
for (walk = tmppads; walk; walk = g_slist_next (walk)) {
GstRtpPtDemuxPad *pad = walk->data;
gst_pad_set_active (pad->pad, FALSE);
gst_element_remove_pad (GST_ELEMENT_CAST (ptdemux), pad->pad);
g_slice_free (GstRtpPtDemuxPad, pad);
}
g_slist_free (tmppads);
}
static GstStateChangeReturn
gst_rtp_pt_demux_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstRtpPtDemux *ptdemux;
ptdemux = GST_RTP_PT_DEMUX (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (gst_rtp_pt_demux_setup (ptdemux) != TRUE)
ret = GST_STATE_CHANGE_FAILURE;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
gst_rtp_pt_demux_release (ptdemux);
break;
default:
break;
}
return ret;
}