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rtpssrcdemux: Release lock before signalling new pad

Browse source 
This prevents a deadlock where something would try to push an event
through the SSRC demux from the callback, causing the pads to be iterated
and the lock taken.
This commit is contained in:
Olivier Crête 2012-08-03 16:13:52 +01:00
parent c074bfd0b9
commit 2aa360c936
1 changed files with 46 additions and 21 deletions
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67
gst/rtpmanager/gstrtpssrcdemux.c
View file

@ -86,6 +86,12 @@ GST_STATIC_PAD_TEMPLATE ("rtcp_src_%u",
#define GST_PAD_LOCK(obj) (g_rec_mutex_lock (&(obj)->padlock))
#define GST_PAD_UNLOCK(obj) (g_rec_mutex_unlock (&(obj)->padlock))
typedef enum
{
RTP_PAD,
RTCP_PAD
} PadType;
/* signals */
enum
{
@ -207,9 +213,9 @@ forward_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data)
}
/* with PAD_LOCK */
static GstRtpSsrcDemuxPad *
find_or_create_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
static GstPad *
find_or_create_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc,
PadType padtype)
{
GstPad *rtp_pad, *rtcp_pad;
GstElementClass *klass;
@ -218,12 +224,26 @@ find_or_create_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
GstRtpSsrcDemuxPad *demuxpad;
GstCaps *caps;
struct ForwardEventData fdata;
GstPad *retpad;
GST_DEBUG_OBJECT (demux, "creating pad for SSRC %08x", ssrc);
GST_PAD_LOCK (demux);
demuxpad = find_demux_pad_for_ssrc (demux, ssrc);
if (demuxpad != NULL) {
return demuxpad;
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:
g_assert_not_reached ();
}
GST_PAD_UNLOCK (demux);
return retpad;
}
klass = GST_ELEMENT_GET_CLASS (demux);
@ -281,10 +301,27 @@ find_or_create_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
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:
g_assert_not_reached ();
}
gst_object_ref (rtp_pad);
GST_PAD_UNLOCK (demux);
g_signal_emit (G_OBJECT (demux),
gst_rtp_ssrc_demux_signals[SIGNAL_NEW_SSRC_PAD], 0, ssrc, rtp_pad);
return demuxpad;
gst_object_unref (rtp_pad);
return retpad;
}
static void
@ -574,7 +611,6 @@ gst_rtp_ssrc_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
GstFlowReturn ret;
GstRtpSsrcDemux *demux;
guint32 ssrc;
GstRtpSsrcDemuxPad *dpad;
GstRTPBuffer rtp = { NULL };
GstPad *srcpad;
@ -588,14 +624,9 @@ gst_rtp_ssrc_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
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);
srcpad = find_or_create_demux_pad_for_ssrc (demux, ssrc, RTP_PAD);
if (srcpad == NULL)
goto create_failed;
}
srcpad = gst_object_ref (dpad->rtp_pad);
GST_PAD_UNLOCK (demux);
/* push to srcpad */
ret = gst_pad_push (srcpad, buf);
@ -629,7 +660,6 @@ gst_rtp_ssrc_demux_rtcp_chain (GstPad * pad, GstObject * parent,
GstFlowReturn ret;
GstRtpSsrcDemux *demux;
guint32 ssrc;
GstRtpSsrcDemuxPad *dpad;
GstRTCPPacket packet;
GstRTCPBuffer rtcp = { NULL, };
GstPad *srcpad;
@ -659,14 +689,9 @@ gst_rtp_ssrc_demux_rtcp_chain (GstPad * pad, GstObject * parent,
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);
srcpad = find_or_create_demux_pad_for_ssrc (demux, ssrc, RTCP_PAD);
if (srcpad == NULL)
goto create_failed;
}
srcpad = gst_object_ref (dpad->rtcp_pad);
GST_PAD_UNLOCK (demux);
/* push to srcpad */
ret = gst_pad_push (srcpad, buf);