static GstFlowReturn
gst_rtp_ssrc_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstFlowReturn ret;
GstRtpSsrcDemux *demux;
guint32 ssrc;
GstRtpSsrcDemuxPad *dpad;
GstRTPBuffer rtp = { NULL };
GstPad *srcpad;
demux = GST_RTP_SSRC_DEMUX (parent);
if (!gst_rtp_buffer_validate (buf))
goto invalid_payload;
gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
ssrc = gst_rtp_buffer_get_ssrc (&rtp);
gst_rtp_buffer_unmap (&rtp);
GST_DEBUG_OBJECT (demux, "received buffer of SSRC %08x", ssrc);
GST_PAD_LOCK (demux);
dpad = find_or_create_demux_pad_for_ssrc (demux, ssrc);
if (dpad == NULL) {
GST_PAD_UNLOCK (demux);
goto create_failed;
}
srcpad = gst_object_ref (dpad->rtp_pad);
GST_PAD_UNLOCK (demux);
/* push to srcpad */
ret = gst_pad_push (srcpad, buf);
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_chain (GstPad * pad, GstBuffer * buf)
{
GstFlowReturn ret;
GstRtpSsrcDemux *demux;
guint32 ssrc;
GstRtpSsrcDemuxPad *dpad;
demux = GST_RTP_SSRC_DEMUX (GST_OBJECT_PARENT (pad));
if (!gst_rtp_buffer_validate (buf))
goto invalid_payload;
ssrc = gst_rtp_buffer_get_ssrc (buf);
GST_DEBUG_OBJECT (demux, "received buffer of SSRC %08x", ssrc);
GST_PAD_LOCK (demux);
dpad = find_demux_pad_for_ssrc (demux, ssrc);
if (dpad == NULL) {
if (!(dpad =
create_demux_pad_for_ssrc (demux, ssrc,
GST_BUFFER_TIMESTAMP (buf))))
goto create_failed;
}
GST_PAD_UNLOCK (demux);
/* push to srcpad */
ret = gst_pad_push (dpad->rtp_pad, buf);
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_PAD_UNLOCK (demux);
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}
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_PAD_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_PAD_UNLOCK (demux);
return it;
}
static gboolean
forward_event (GstPad * pad, gpointer user_data)
{
struct ForwardEventData *fdata = user_data;
GSList *walk = NULL;
GstEvent *newevent = NULL;
GST_PAD_LOCK (fdata->demux);
for (walk = fdata->demux->srcpads; walk; walk = walk->next) {
GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) walk->data;
/* Only forward the event if the initial events have been through first,
* the initial events should be forwarded before any other event
* or buffer is pushed */
if ((pad == dpad->rtp_pad && dpad->pushed_initial_rtp_events) ||
(pad == dpad->rtcp_pad && dpad->pushed_initial_rtcp_events)) {
newevent = add_ssrc_and_ref (fdata->event, dpad->ssrc);
break;
}
}
GST_PAD_UNLOCK (fdata->demux);
if (newevent)
fdata->res &= gst_pad_push_event (pad, newevent);
return TRUE;
}
static GstIterator *
gst_rtp_ssrc_demux_iterate_internal_links (GstPad * pad)
{
GstRtpSsrcDemux *demux;
GstPad *otherpad = NULL;
GstIterator *it;
GSList *current;
demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
GST_PAD_LOCK (demux);
for (current = demux->srcpads; current; current = g_slist_next (current)) {
GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) current->data;
if (pad == demux->rtp_sink) {
otherpad = dpad->rtp_pad;
break;
} else if (pad == demux->rtcp_sink) {
otherpad = dpad->rtcp_pad;
} else if (pad == dpad->rtp_pad) {
otherpad = demux->rtp_sink;
break;
} else if (pad == dpad->rtcp_pad) {
otherpad = demux->rtcp_sink;
break;
}
}
it = gst_iterator_new_single (GST_TYPE_PAD, otherpad,
(GstCopyFunction) gst_object_ref, (GFreeFunc) gst_object_unref);
GST_PAD_UNLOCK (demux);
gst_object_unref (demux);
return it;
}
static gboolean
gst_rtp_ssrc_demux_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstRtpSsrcDemux *demux;
gboolean res = FALSE;
demux = GST_RTP_SSRC_DEMUX (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
gst_segment_init (&demux->segment, GST_FORMAT_UNDEFINED);
/* fallthrough */
default:
{
GSList *walk;
GSList *pads = NULL;
res = TRUE;
/* need local snapshot of pads;
* should not push downstream while holding lock as that might deadlock
* with stuff traveling upstream tyring to get this lock while holding
* other (stream)lock */
GST_PAD_LOCK (demux);
for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
GstRtpSsrcDemuxPad *pad = (GstRtpSsrcDemuxPad *) walk->data;
pad = g_slice_dup (GstRtpSsrcDemuxPad, pad);
gst_object_ref (pad->rtp_pad);
pads = g_slist_prepend (pads, pad);
}
GST_PAD_UNLOCK (demux);
for (walk = pads; walk; walk = g_slist_next (walk)) {
GstRtpSsrcDemuxPad *dpad = walk->data;
GstEvent *newevent;
newevent = add_ssrc_and_ref (event, dpad->ssrc);
res &= gst_pad_push_event (dpad->rtp_pad, newevent);
gst_object_unref (dpad->rtp_pad);
g_slice_free (GstRtpSsrcDemuxPad, dpad);
}
g_slist_free (pads);
gst_event_unref (event);
break;
}
}
return res;
}
static void
gst_rtp_ssrc_demux_clear_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
{
GstRtpSsrcDemuxPad *dpad;
GST_PAD_LOCK (demux);
dpad = find_demux_pad_for_ssrc (demux, ssrc);
if (dpad == NULL) {
GST_PAD_UNLOCK (demux);
goto unknown_pad;
}
GST_DEBUG_OBJECT (demux, "clearing pad for SSRC %08x", ssrc);
demux->srcpads = g_slist_remove (demux->srcpads, dpad);
GST_PAD_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;
}
}
static gboolean
gst_rtp_ssrc_demux_rtcp_sink_event (GstPad * pad, GstEvent * event)
{
GstRtpSsrcDemux *demux;
gboolean res = FALSE;
demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
default:
{
GSList *walk;
GSList *pads = NULL;
res = TRUE;
GST_PAD_LOCK (demux);
for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
GstRtpSsrcDemuxPad *pad = (GstRtpSsrcDemuxPad *) walk->data;
pads = g_slist_prepend (pads, gst_object_ref (pad->rtcp_pad));
}
GST_PAD_UNLOCK (demux);
for (walk = pads; walk; walk = g_slist_next (walk)) {
GstPad *pad = (GstPad *) walk->data;
gst_event_ref (event);
res &= gst_pad_push_event (pad, event);
gst_object_unref (pad);
}
g_slist_free (pads);
gst_event_unref (event);
break;
}
}
gst_object_unref (demux);
return res;
}
static gboolean
gst_rtp_ssrc_demux_rtcp_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstRtpSsrcDemux *demux;
gboolean res = TRUE;
GSList *walk;
GSList *pads = NULL;
demux = GST_RTP_SSRC_DEMUX (parent);
GST_PAD_LOCK (demux);
for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
GstRtpSsrcDemuxPad *pad = (GstRtpSsrcDemuxPad *) walk->data;
pad = g_slice_dup (GstRtpSsrcDemuxPad, pad);
gst_object_ref (pad->rtcp_pad);
pads = g_slist_prepend (pads, pad);
}
GST_PAD_UNLOCK (demux);
for (walk = pads; walk; walk = g_slist_next (walk)) {
GstRtpSsrcDemuxPad *dpad = walk->data;
GstEvent *newevent;
newevent = add_ssrc_and_ref (event, dpad->ssrc);
res &= gst_pad_push_event (dpad->rtcp_pad, newevent);
gst_object_unref (dpad->rtcp_pad);
g_slice_free (GstRtpSsrcDemuxPad, dpad);
}
g_slist_free (pads);
gst_event_unref (event);
return res;
}
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;
GstRtpSsrcDemuxPad *dpad;
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) {
/* check if the ssrc still there, may have been removed */
GST_PAD_LOCK (demux);
dpad = find_demux_pad_for_ssrc (demux, ssrc);
if (dpad == NULL || dpad->rtcp_pad != srcpad) {
/* SSRC was removed during the push ... ignore the error */
ret = GST_FLOW_OK;
}
GST_PAD_UNLOCK (demux);
}
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 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;
gulong rtp_block, rtcp_block;
GST_PAD_LOCK (demux);
demuxpad = find_demux_pad_for_ssrc (demux, ssrc);
if (demuxpad != NULL) {
gboolean forward = FALSE;
switch (padtype) {
case RTP_PAD:
retpad = gst_object_ref (demuxpad->rtp_pad);
if (!demuxpad->pushed_initial_rtp_events) {
forward = TRUE;
demuxpad->pushed_initial_rtp_events = TRUE;
}
break;
case RTCP_PAD:
retpad = gst_object_ref (demuxpad->rtcp_pad);
if (!demuxpad->pushed_initial_rtcp_events) {
forward = TRUE;
demuxpad->pushed_initial_rtcp_events = TRUE;
}
break;
default:
retpad = NULL;
g_assert_not_reached ();
}
GST_PAD_UNLOCK (demux);
if (forward)
forward_initial_events (demux, ssrc, retpad, padtype);
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);
demux->srcpads = g_slist_prepend (demux->srcpads, demuxpad);
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);
if (padtype == RTP_PAD) {
demuxpad->pushed_initial_rtp_events = TRUE;
forward_initial_events (demux, ssrc, rtp_pad, padtype);
} else if (padtype == RTCP_PAD) {
demuxpad->pushed_initial_rtcp_events = TRUE;
forward_initial_events (demux, ssrc, rtcp_pad, padtype);
} else {
g_assert_not_reached ();
}
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 ();
}
gst_object_ref (rtp_pad);
gst_object_ref (rtcp_pad);
rtp_block = gst_pad_add_probe (rtp_pad, GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM,
NULL, NULL, NULL);
rtcp_block = gst_pad_add_probe (rtcp_pad, GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM,
NULL, NULL, NULL);
GST_PAD_UNLOCK (demux);
g_signal_emit (G_OBJECT (demux),
gst_rtp_ssrc_demux_signals[SIGNAL_NEW_SSRC_PAD], 0, ssrc, rtp_pad);
gst_pad_remove_probe (rtp_pad, rtp_block);
gst_pad_remove_probe (rtcp_pad, rtcp_block);
gst_object_unref (rtp_pad);
gst_object_unref (rtcp_pad);
return retpad;
}
static GstFlowReturn
gst_rtp_ssrc_demux_rtcp_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf)
{
GstFlowReturn ret;
GstRtpSsrcDemux *demux;
guint32 ssrc;
GstRtpSsrcDemuxPad *dpad;
GstRTCPPacket packet;
GstRTCPBuffer rtcp = { NULL, };
GstPad *srcpad;
demux = GST_RTP_SSRC_DEMUX (parent);
if (!gst_rtcp_buffer_validate (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 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;
default:
goto unexpected_rtcp;
}
gst_rtcp_buffer_unmap (&rtcp);
GST_DEBUG_OBJECT (demux, "received RTCP of SSRC %08x", ssrc);
GST_PAD_LOCK (demux);
dpad = find_or_create_demux_pad_for_ssrc (demux, ssrc);
if (dpad == NULL) {
GST_PAD_UNLOCK (demux);
goto create_failed;
}
srcpad = gst_object_ref (dpad->rtcp_pad);
GST_PAD_UNLOCK (demux);
/* push to srcpad */
ret = gst_pad_push (srcpad, buf);
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;
}
}
