/* GStreamer
* Copyright (C) <2007> Wim Taymans <wim.taymans@gmail.com>
*
* RTP SSRC demuxer
*
* 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-rtpssrcdemux
*
* rtpssrcdemux acts as a demuxer for RTP packets based on the SSRC of the
* packets. Its main purpose is to allow an application to easily receive and
* decode an RTP stream with multiple SSRCs.
*
* For each SSRC that is detected, a new pad will be created and the
* #GstRtpSsrcDemux::new-ssrc-pad signal will be emitted.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch-1.0 udpsrc caps="application/x-rtp" ! rtpssrcdemux ! fakesink
* ]| Takes an RTP stream and send the RTP packets with the first detected SSRC
* to fakesink, discarding the other SSRCs.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <gst/rtp/gstrtcpbuffer.h>
#include "gstrtpssrcdemux.h"
GST_DEBUG_CATEGORY_STATIC (gst_rtp_ssrc_demux_debug);
#define GST_CAT_DEFAULT gst_rtp_ssrc_demux_debug
/* generic templates */
static GstStaticPadTemplate rtp_ssrc_demux_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp")
);
static GstStaticPadTemplate rtp_ssrc_demux_rtcp_sink_template =
GST_STATIC_PAD_TEMPLATE ("rtcp_sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtcp")
);
static GstStaticPadTemplate rtp_ssrc_demux_src_template =
GST_STATIC_PAD_TEMPLATE ("src_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS ("application/x-rtp")
);
static GstStaticPadTemplate rtp_ssrc_demux_rtcp_src_template =
GST_STATIC_PAD_TEMPLATE ("rtcp_src_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS ("application/x-rtcp")
);
#define INTERNAL_STREAM_LOCK(obj) (g_rec_mutex_lock (&(obj)->padlock))
#define INTERNAL_STREAM_UNLOCK(obj) (g_rec_mutex_unlock (&(obj)->padlock))
typedef enum
{
RTP_PAD,
RTCP_PAD
} PadType;
/* signals */
enum
{
SIGNAL_NEW_SSRC_PAD,
SIGNAL_REMOVED_SSRC_PAD,
SIGNAL_CLEAR_SSRC,
LAST_SIGNAL
};
#define gst_rtp_ssrc_demux_parent_class parent_class
G_DEFINE_TYPE (GstRtpSsrcDemux, gst_rtp_ssrc_demux, GST_TYPE_ELEMENT);
/* GObject vmethods */
static void gst_rtp_ssrc_demux_dispose (GObject * object);
static void gst_rtp_ssrc_demux_finalize (GObject * object);
/* GstElement vmethods */
static GstStateChangeReturn gst_rtp_ssrc_demux_change_state (GstElement *
element, GstStateChange transition);
static void gst_rtp_ssrc_demux_clear_ssrc (GstRtpSsrcDemux * demux,
guint32 ssrc);
/* sinkpad stuff */
static GstFlowReturn gst_rtp_ssrc_demux_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static gboolean gst_rtp_ssrc_demux_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstFlowReturn gst_rtp_ssrc_demux_rtcp_chain (GstPad * pad,
GstObject * parent, GstBuffer * buf);
static GstIterator *gst_rtp_ssrc_demux_iterate_internal_links_sink (GstPad *
pad, GstObject * parent);
/* srcpad stuff */
static gboolean gst_rtp_ssrc_demux_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstIterator *gst_rtp_ssrc_demux_iterate_internal_links_src (GstPad * pad,
GstObject * parent);
static gboolean gst_rtp_ssrc_demux_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static guint gst_rtp_ssrc_demux_signals[LAST_SIGNAL] = { 0 };
/*
* Item for storing GstPad <-> SSRC pairs.
*/
struct _GstRtpSsrcDemuxPad
{
guint32 ssrc;
GstPad *rtp_pad;
GstCaps *caps;
GstPad *rtcp_pad;
};
/* find a src pad for a given SSRC, returns NULL if the SSRC was not found
* MUST be called with object lock
*/
static GstRtpSsrcDemuxPad *
find_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
{
GSList *walk;
for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
GstRtpSsrcDemuxPad *pad = (GstRtpSsrcDemuxPad *) walk->data;
if (pad->ssrc == ssrc)
return pad;
}
return NULL;
}
/* returns a reference to the pad if found, %NULL otherwise */
static GstPad *
get_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc, PadType padtype)
{
GstRtpSsrcDemuxPad *demuxpad;
GstPad *retpad;
GST_OBJECT_LOCK (demux);
demuxpad = find_demux_pad_for_ssrc (demux, ssrc);
if (!demuxpad) {
GST_OBJECT_UNLOCK (demux);
return NULL;
}
switch (padtype) {
case RTP_PAD:
retpad = gst_object_ref (demuxpad->rtp_pad);
break;
case RTCP_PAD:
retpad = gst_object_ref (demuxpad->rtcp_pad);
break;
default:
retpad = NULL;
g_assert_not_reached ();
}
GST_OBJECT_UNLOCK (demux);
return retpad;
}
static GstEvent *
add_ssrc_and_ref (GstEvent * event, guint32 ssrc)
{
/* Set the ssrc on the output caps */
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
GstCaps *newcaps;
GstStructure *s;
gst_event_parse_caps (event, &caps);
newcaps = gst_caps_copy (caps);
s = gst_caps_get_structure (newcaps, 0);
gst_structure_set (s, "ssrc", G_TYPE_UINT, ssrc, NULL);
event = gst_event_new_caps (newcaps);
gst_caps_unref (newcaps);
break;
}
default:
gst_event_ref (event);
break;
}
return event;
}
struct ForwardStickyEventData
{
GstPad *pad;
guint32 ssrc;
};
/* With internal stream lock held */
static gboolean
forward_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data)
{
struct ForwardStickyEventData *data = user_data;
GstEvent *newevent;
newevent = add_ssrc_and_ref (*event, data->ssrc);
gst_pad_push_event (data->pad, newevent);
return TRUE;
}
/* With internal stream lock held */
static void
forward_initial_events (GstRtpSsrcDemux * demux, guint32 ssrc, GstPad * pad,
PadType padtype)
{
struct ForwardStickyEventData fdata;
GstPad *sinkpad = NULL;
if (padtype == RTP_PAD)
sinkpad = demux->rtp_sink;
else if (padtype == RTCP_PAD)
sinkpad = demux->rtcp_sink;
else
g_assert_not_reached ();
fdata.ssrc = ssrc;
fdata.pad = pad;
gst_pad_sticky_events_foreach (sinkpad, forward_sticky_events, &fdata);
}
/* MUST only be called from streaming thread */
static GstPad *
find_or_create_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc,
PadType padtype)
{
GstPad *rtp_pad, *rtcp_pad;
GstElementClass *klass;
GstPadTemplate *templ;
gchar *padname;
GstRtpSsrcDemuxPad *demuxpad;
GstPad *retpad;
INTERNAL_STREAM_LOCK (demux);
retpad = get_demux_pad_for_ssrc (demux, ssrc, padtype);
if (retpad != NULL) {
INTERNAL_STREAM_UNLOCK (demux);
return retpad;
}
GST_DEBUG_OBJECT (demux, "creating new pad for SSRC %08x", ssrc);
klass = GST_ELEMENT_GET_CLASS (demux);
templ = gst_element_class_get_pad_template (klass, "src_%u");
padname = g_strdup_printf ("src_%u", ssrc);
rtp_pad = gst_pad_new_from_template (templ, padname);
g_free (padname);
templ = gst_element_class_get_pad_template (klass, "rtcp_src_%u");
padname = g_strdup_printf ("rtcp_src_%u", ssrc);
rtcp_pad = gst_pad_new_from_template (templ, padname);
g_free (padname);
/* wrap in structure and add to list */
demuxpad = g_new0 (GstRtpSsrcDemuxPad, 1);
demuxpad->ssrc = ssrc;
demuxpad->rtp_pad = rtp_pad;
demuxpad->rtcp_pad = rtcp_pad;
gst_pad_set_element_private (rtp_pad, demuxpad);
gst_pad_set_element_private (rtcp_pad, demuxpad);
GST_OBJECT_LOCK (demux);
demux->srcpads = g_slist_prepend (demux->srcpads, demuxpad);
GST_OBJECT_UNLOCK (demux);
gst_pad_set_query_function (rtp_pad, gst_rtp_ssrc_demux_src_query);
gst_pad_set_iterate_internal_links_function (rtp_pad,
gst_rtp_ssrc_demux_iterate_internal_links_src);
gst_pad_set_event_function (rtp_pad, gst_rtp_ssrc_demux_src_event);
gst_pad_use_fixed_caps (rtp_pad);
gst_pad_set_active (rtp_pad, TRUE);
gst_pad_set_event_function (rtcp_pad, gst_rtp_ssrc_demux_src_event);
gst_pad_set_iterate_internal_links_function (rtcp_pad,
gst_rtp_ssrc_demux_iterate_internal_links_src);
gst_pad_use_fixed_caps (rtcp_pad);
gst_pad_set_active (rtcp_pad, TRUE);
forward_initial_events (demux, ssrc, rtp_pad, RTP_PAD);
forward_initial_events (demux, ssrc, rtcp_pad, RTCP_PAD);
gst_element_add_pad (GST_ELEMENT_CAST (demux), rtp_pad);
gst_element_add_pad (GST_ELEMENT_CAST (demux), rtcp_pad);
switch (padtype) {
case RTP_PAD:
retpad = gst_object_ref (demuxpad->rtp_pad);
break;
case RTCP_PAD:
retpad = gst_object_ref (demuxpad->rtcp_pad);
break;
default:
retpad = NULL;
g_assert_not_reached ();
}
g_signal_emit (G_OBJECT (demux),
gst_rtp_ssrc_demux_signals[SIGNAL_NEW_SSRC_PAD], 0, ssrc, rtp_pad);
INTERNAL_STREAM_UNLOCK (demux);
return retpad;
}
static void
gst_rtp_ssrc_demux_class_init (GstRtpSsrcDemuxClass * klass)
{
GObjectClass *gobject_klass;
GstElementClass *gstelement_klass;
GstRtpSsrcDemuxClass *gstrtpssrcdemux_klass;
gobject_klass = (GObjectClass *) klass;
gstelement_klass = (GstElementClass *) klass;
gstrtpssrcdemux_klass = (GstRtpSsrcDemuxClass *) klass;
gobject_klass->dispose = gst_rtp_ssrc_demux_dispose;
gobject_klass->finalize = gst_rtp_ssrc_demux_finalize;
/**
* GstRtpSsrcDemux::new-ssrc-pad:
* @demux: the object which received the signal
* @ssrc: the SSRC of the pad
* @pad: the new pad.
*
* Emited when a new SSRC pad has been created.
*/
gst_rtp_ssrc_demux_signals[SIGNAL_NEW_SSRC_PAD] =
g_signal_new ("new-ssrc-pad",
G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, new_ssrc_pad),
NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 2, G_TYPE_UINT,
GST_TYPE_PAD);
/**
* GstRtpSsrcDemux::removed-ssrc-pad:
* @demux: the object which received the signal
* @ssrc: the SSRC of the pad
* @pad: the removed pad.
*
* Emited when a SSRC pad has been removed.
*/
gst_rtp_ssrc_demux_signals[SIGNAL_REMOVED_SSRC_PAD] =
g_signal_new ("removed-ssrc-pad",
G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, removed_ssrc_pad),
NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 2, G_TYPE_UINT,
GST_TYPE_PAD);
/**
* GstRtpSsrcDemux::clear-ssrc:
* @demux: the object which received the signal
* @ssrc: the SSRC of the pad
*
* Action signal to remove the pad for SSRC.
*/
gst_rtp_ssrc_demux_signals[SIGNAL_CLEAR_SSRC] =
g_signal_new ("clear-ssrc",
G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, clear_ssrc),
NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 1, G_TYPE_UINT);
gstelement_klass->change_state =
GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_change_state);
gstrtpssrcdemux_klass->clear_ssrc =
GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_clear_ssrc);
gst_element_class_add_static_pad_template (gstelement_klass,
&rtp_ssrc_demux_sink_template);
gst_element_class_add_static_pad_template (gstelement_klass,
&rtp_ssrc_demux_rtcp_sink_template);
gst_element_class_add_static_pad_template (gstelement_klass,
&rtp_ssrc_demux_src_template);
gst_element_class_add_static_pad_template (gstelement_klass,
&rtp_ssrc_demux_rtcp_src_template);
gst_element_class_set_static_metadata (gstelement_klass, "RTP SSRC Demux",
"Demux/Network/RTP",
"Splits RTP streams based on the SSRC",
"Wim Taymans <wim.taymans@gmail.com>");
GST_DEBUG_CATEGORY_INIT (gst_rtp_ssrc_demux_debug,
"rtpssrcdemux", 0, "RTP SSRC demuxer");
GST_DEBUG_REGISTER_FUNCPTR (gst_rtp_ssrc_demux_chain);
GST_DEBUG_REGISTER_FUNCPTR (gst_rtp_ssrc_demux_rtcp_chain);
}
static void
gst_rtp_ssrc_demux_init (GstRtpSsrcDemux * demux)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (demux);
demux->rtp_sink =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"sink"), "sink");
gst_pad_set_chain_function (demux->rtp_sink, gst_rtp_ssrc_demux_chain);
gst_pad_set_event_function (demux->rtp_sink, gst_rtp_ssrc_demux_sink_event);
gst_pad_set_iterate_internal_links_function (demux->rtp_sink,
gst_rtp_ssrc_demux_iterate_internal_links_sink);
gst_element_add_pad (GST_ELEMENT_CAST (demux), demux->rtp_sink);
demux->rtcp_sink =
gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
"rtcp_sink"), "rtcp_sink");
gst_pad_set_chain_function (demux->rtcp_sink, gst_rtp_ssrc_demux_rtcp_chain);
gst_pad_set_event_function (demux->rtcp_sink, gst_rtp_ssrc_demux_sink_event);
gst_pad_set_iterate_internal_links_function (demux->rtcp_sink,
gst_rtp_ssrc_demux_iterate_internal_links_sink);
gst_element_add_pad (GST_ELEMENT_CAST (demux), demux->rtcp_sink);
g_rec_mutex_init (&demux->padlock);
}
static void
gst_rtp_ssrc_demux_reset (GstRtpSsrcDemux * demux)
{
GSList *walk;
for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) walk->data;
gst_pad_set_active (dpad->rtp_pad, FALSE);
gst_pad_set_active (dpad->rtcp_pad, FALSE);
gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtp_pad);
gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtcp_pad);
g_free (dpad);
}
g_slist_free (demux->srcpads);
demux->srcpads = NULL;
}
static void
gst_rtp_ssrc_demux_dispose (GObject * object)
{
GstRtpSsrcDemux *demux;
demux = GST_RTP_SSRC_DEMUX (object);
gst_rtp_ssrc_demux_reset (demux);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_rtp_ssrc_demux_finalize (GObject * object)
{
GstRtpSsrcDemux *demux;
demux = GST_RTP_SSRC_DEMUX (object);
g_rec_mutex_clear (&demux->padlock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_rtp_ssrc_demux_clear_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
{
GstRtpSsrcDemuxPad *dpad;
GST_OBJECT_LOCK (demux);
dpad = find_demux_pad_for_ssrc (demux, ssrc);
if (dpad == NULL) {
GST_OBJECT_UNLOCK (demux);
goto unknown_pad;
}
GST_DEBUG_OBJECT (demux, "clearing pad for SSRC %08x", ssrc);
demux->srcpads = g_slist_remove (demux->srcpads, dpad);
GST_OBJECT_UNLOCK (demux);
gst_pad_set_active (dpad->rtp_pad, FALSE);
gst_pad_set_active (dpad->rtcp_pad, FALSE);
g_signal_emit (G_OBJECT (demux),
gst_rtp_ssrc_demux_signals[SIGNAL_REMOVED_SSRC_PAD], 0, ssrc,
dpad->rtp_pad);
gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtp_pad);
gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtcp_pad);
g_free (dpad);
return;
/* ERRORS */
unknown_pad:
{
GST_WARNING_OBJECT (demux, "unknown SSRC %08x", ssrc);
return;
}
}
struct ForwardEventData
{
GstRtpSsrcDemux *demux;
GstEvent *event;
gboolean res;
GstPad *pad;
};
static gboolean
forward_event (GstPad * pad, gpointer user_data)
{
struct ForwardEventData *fdata = user_data;
GSList *walk = NULL;
GstEvent *newevent = NULL;
GST_OBJECT_LOCK (fdata->demux);
for (walk = fdata->demux->srcpads; walk; walk = walk->next) {
GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) walk->data;
if (pad == dpad->rtp_pad || pad == dpad->rtcp_pad) {
newevent = add_ssrc_and_ref (fdata->event, dpad->ssrc);
break;
}
}
GST_OBJECT_UNLOCK (fdata->demux);
if (newevent)
fdata->res &= gst_pad_push_event (pad, newevent);
return FALSE;
}
static gboolean
gst_rtp_ssrc_demux_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstRtpSsrcDemux *demux;
struct ForwardEventData fdata;
demux = GST_RTP_SSRC_DEMUX (parent);
fdata.demux = demux;
fdata.pad = pad;
fdata.event = event;
fdata.res = TRUE;
gst_pad_forward (pad, forward_event, &fdata);
gst_event_unref (event);
return fdata.res;
}
static GstFlowReturn
gst_rtp_ssrc_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstFlowReturn ret;
GstRtpSsrcDemux *demux;
guint32 ssrc;
GstRTPBuffer rtp = { NULL };
GstPad *srcpad;
demux = GST_RTP_SSRC_DEMUX (parent);
if (!gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp))
goto invalid_payload;
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
gst_rtp_buffer_unmap (&rtp);
GST_DEBUG_OBJECT (demux, "received buffer of SSRC %08x", ssrc);
srcpad = find_or_create_demux_pad_for_ssrc (demux, ssrc, RTP_PAD);
if (srcpad == NULL)
goto create_failed;
/* push to srcpad */
ret = gst_pad_push (srcpad, buf);
if (ret != GST_FLOW_OK) {
GstPad *active_pad;
/* check if the ssrc still there, may have been removed */
active_pad = get_demux_pad_for_ssrc (demux, ssrc, RTP_PAD);
if (active_pad == NULL || active_pad != srcpad) {
/* SSRC was removed during the push ... ignore the error */
ret = GST_FLOW_OK;
}
g_clear_object (&active_pad);
}
gst_object_unref (srcpad);
return ret;
/* ERRORS */
invalid_payload:
{
/* this is fatal and should be filtered earlier */
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
("Dropping invalid RTP payload"));
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
create_failed:
{
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
("Could not create new pad"));
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_rtp_ssrc_demux_rtcp_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf)
{
GstFlowReturn ret;
GstRtpSsrcDemux *demux;
guint32 ssrc;
GstRTCPPacket packet;
GstRTCPBuffer rtcp = { NULL, };
GstPad *srcpad;
demux = GST_RTP_SSRC_DEMUX (parent);
if (!gst_rtcp_buffer_validate_reduced (buf))
goto invalid_rtcp;
gst_rtcp_buffer_map (buf, GST_MAP_READ, &rtcp);
if (!gst_rtcp_buffer_get_first_packet (&rtcp, &packet)) {
gst_rtcp_buffer_unmap (&rtcp);
goto invalid_rtcp;
}
/* first packet must be SR or RR, or in case of a reduced size RTCP packet
* it must be APP, RTPFB or PSFB feeadback, or else the validate would
* have failed */
switch (gst_rtcp_packet_get_type (&packet)) {
case GST_RTCP_TYPE_SR:
/* get the ssrc so that we can route it to the right source pad */
gst_rtcp_packet_sr_get_sender_info (&packet, &ssrc, NULL, NULL, NULL,
NULL);
break;
case GST_RTCP_TYPE_RR:
ssrc = gst_rtcp_packet_rr_get_ssrc (&packet);
break;
case GST_RTCP_TYPE_APP:
case GST_RTCP_TYPE_RTPFB:
case GST_RTCP_TYPE_PSFB:
ssrc = gst_rtcp_packet_fb_get_sender_ssrc (&packet);
break;
default:
goto unexpected_rtcp;
}
gst_rtcp_buffer_unmap (&rtcp);
GST_DEBUG_OBJECT (demux, "received RTCP of SSRC %08x", ssrc);
srcpad = find_or_create_demux_pad_for_ssrc (demux, ssrc, RTCP_PAD);
if (srcpad == NULL)
goto create_failed;
/* push to srcpad */
ret = gst_pad_push (srcpad, buf);
if (ret != GST_FLOW_OK) {
GstPad *active_pad;
/* check if the ssrc still there, may have been removed */
active_pad = get_demux_pad_for_ssrc (demux, ssrc, RTCP_PAD);
if (active_pad == NULL || active_pad != srcpad) {
/* SSRC was removed during the push ... ignore the error */
ret = GST_FLOW_OK;
}
g_clear_object (&active_pad);
}
gst_object_unref (srcpad);
return ret;
/* ERRORS */
invalid_rtcp:
{
/* this is fatal and should be filtered earlier */
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
("Dropping invalid RTCP packet"));
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
unexpected_rtcp:
{
GST_DEBUG_OBJECT (demux, "dropping unexpected RTCP packet");
gst_buffer_unref (buf);
return GST_FLOW_OK;
}
create_failed:
{
GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
("Could not create new pad"));
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}
static GstRtpSsrcDemuxPad *
find_demux_pad_for_pad (GstRtpSsrcDemux * demux, GstPad * pad)
{
GSList *walk;
for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) walk->data;
if (dpad->rtp_pad == pad || dpad->rtcp_pad == pad) {
return dpad;
}
}
return NULL;
}
static gboolean
gst_rtp_ssrc_demux_src_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstRtpSsrcDemux *demux;
const GstStructure *s;
demux = GST_RTP_SSRC_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, "ssrc")) {
GstRtpSsrcDemuxPad *dpad = find_demux_pad_for_pad (demux, pad);
if (dpad) {
GstStructure *ws;
event = gst_event_make_writable (event);
ws = gst_event_writable_structure (event);
gst_structure_set (ws, "ssrc", G_TYPE_UINT, dpad->ssrc, NULL);
}
}
break;
default:
break;
}
return gst_pad_event_default (pad, parent, event);
}
static GstIterator *
gst_rtp_ssrc_demux_iterate_internal_links_src (GstPad * pad, GstObject * parent)
{
GstRtpSsrcDemux *demux;
GstPad *otherpad = NULL;
GstIterator *it = NULL;
GSList *current;
demux = GST_RTP_SSRC_DEMUX (parent);
GST_OBJECT_LOCK (demux);
for (current = demux->srcpads; current; current = g_slist_next (current)) {
GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) current->data;
if (pad == dpad->rtp_pad) {
otherpad = demux->rtp_sink;
break;
} else if (pad == dpad->rtcp_pad) {
otherpad = demux->rtcp_sink;
break;
}
}
if (otherpad) {
GValue val = { 0, };
g_value_init (&val, GST_TYPE_PAD);
g_value_set_object (&val, otherpad);
it = gst_iterator_new_single (GST_TYPE_PAD, &val);
g_value_unset (&val);
}
GST_OBJECT_UNLOCK (demux);
return it;
}
/* Should return 0 for elements to be included */
static gint
src_pad_compare_func (gconstpointer a, gconstpointer b)
{
GstPad *pad = GST_PAD (g_value_get_object (a));
const gchar *prefix = g_value_get_string (b);
gint res;
/* 0 means equal means we accept the pad, accepted if there is a name
* and it starts with the prefix */
GST_OBJECT_LOCK (pad);
res = !GST_PAD_NAME (pad) || !g_str_has_prefix (GST_PAD_NAME (pad), prefix);
GST_OBJECT_UNLOCK (pad);
return res;
}
static GstIterator *
gst_rtp_ssrc_demux_iterate_internal_links_sink (GstPad * pad,
GstObject * parent)
{
GstRtpSsrcDemux *demux;
GstIterator *it = NULL;
GValue gval = { 0, };
demux = GST_RTP_SSRC_DEMUX (parent);
g_value_init (&gval, G_TYPE_STRING);
if (pad == demux->rtp_sink)
g_value_set_static_string (&gval, "src_");
else if (pad == demux->rtcp_sink)
g_value_set_static_string (&gval, "rtcp_src_");
else
g_assert_not_reached ();
it = gst_element_iterate_src_pads (GST_ELEMENT_CAST (demux));
it = gst_iterator_filter (it, src_pad_compare_func, &gval);
return it;
}
static gboolean
gst_rtp_ssrc_demux_src_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstRtpSsrcDemux *demux;
gboolean res = FALSE;
demux = GST_RTP_SSRC_DEMUX (parent);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
{
if ((res = gst_pad_peer_query (demux->rtp_sink, query))) {
gboolean live;
GstClockTime min_latency, max_latency;
GstRtpSsrcDemuxPad *demuxpad;
demuxpad = gst_pad_get_element_private (pad);
gst_query_parse_latency (query, &live, &min_latency, &max_latency);
GST_DEBUG_OBJECT (demux, "peer min latency %" GST_TIME_FORMAT,
GST_TIME_ARGS (min_latency));
GST_DEBUG_OBJECT (demux, "latency for SSRC %08x", demuxpad->ssrc);
gst_query_set_latency (query, live, min_latency, max_latency);
}
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
static GstStateChangeReturn
gst_rtp_ssrc_demux_change_state (GstElement * element,
GstStateChange transition)
{
GstStateChangeReturn ret;
GstRtpSsrcDemux *demux;
demux = GST_RTP_SSRC_DEMUX (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
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:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_rtp_ssrc_demux_reset (demux);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
default:
break;
}
return ret;
}