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srtpenc: Handle session object disappearing

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During element shutdown, the srtp encryption session
object can be cleaned up. In that case, return GST_FLOW_FLUSHING
from the chain function. Also properly return GST_FLOW_ERROR
upstream during actual errors.

https://bugzilla.gnome.org/show_bug.cgi?id=790508
This commit is contained in:
Jan Schmidt 2018-05-05 01:59:53 +10:00
parent e9e98715b0
commit 3740837c18
1 changed files with 39 additions and 27 deletions
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66
ext/srtp/gstsrtpenc.c
View file

@ -160,6 +160,7 @@ typedef struct ProcessBufferItData
GstSrtpEnc *filter;
GstPad *pad;
GstBufferList *out_list;
GstFlowReturn flowret;
gboolean is_rtcp;
} ProcessBufferItData;
@ -1029,10 +1030,11 @@ gst_srtp_enc_check_set_caps (GstSrtpEnc * filter, GstPad * pad,
return GST_FLOW_OK;
}
static GstBuffer *
static GstFlowReturn
gst_srtp_enc_process_buffer (GstSrtpEnc * filter, GstPad * pad,
GstBuffer * buf, gboolean is_rtcp)
GstBuffer * buf, gboolean is_rtcp, GstBuffer ** outbuf_ptr)
{
GstFlowReturn ret = GST_FLOW_OK;
gint size_max, size;
GstBuffer *bufout = NULL;
GstMapInfo mapout;
@ -1051,6 +1053,13 @@ gst_srtp_enc_process_buffer (GstSrtpEnc * filter, GstPad * pad,
gst_srtp_init_event_reporter ();
if (filter->session == NULL) {
/* The rtcp session disappeared (element shutting down) */
GST_OBJECT_UNLOCK (filter);
ret = GST_FLOW_FLUSHING;
goto fail;
}
if (is_rtcp)
err = srtp_protect_rtcp (filter->session, mapout.data, &size);
else
@ -1073,20 +1082,23 @@ gst_srtp_enc_process_buffer (GstSrtpEnc * filter, GstPad * pad,
GST_ELEMENT_ERROR (GST_ELEMENT_CAST (filter), STREAM, ENCODE,
("Key usage limit has been reached"),
("Unable to protect buffer (hard key usage limit reached)"));
ret = GST_FLOW_ERROR;
goto fail;
} else {
/* srtp_protect failed */
GST_ELEMENT_ERROR (filter, LIBRARY, FAILED, (NULL),
("Unable to protect buffer (protect failed) code %d", err));
ret = GST_FLOW_ERROR;
goto fail;
}
return bufout;
*outbuf_ptr = bufout;
return ret;
fail:
gst_buffer_unref (bufout);
return NULL;
return ret;
}
static GstFlowReturn
@ -1112,17 +1124,17 @@ gst_srtp_enc_chain (GstPad * pad, GstObject * parent, GstBuffer * buf,
GST_OBJECT_UNLOCK (filter);
if ((bufout = gst_srtp_enc_process_buffer (filter, pad, buf, is_rtcp))) {
/* Push buffer to source pad */
otherpad = get_rtp_other_pad (pad);
ret = gst_pad_push (otherpad, bufout);
bufout = NULL;
ret = gst_srtp_enc_process_buffer (filter, pad, buf, is_rtcp, &bufout);
if (ret != GST_FLOW_OK)
goto out;
if (ret != GST_FLOW_OK)
goto out;
} else {
goto fail;
}
/* Push buffer to source pad */
otherpad = get_rtp_other_pad (pad);
ret = gst_pad_push (otherpad, bufout);
bufout = NULL;
if (ret != GST_FLOW_OK)
goto out;
GST_OBJECT_LOCK (filter);
@ -1137,14 +1149,8 @@ gst_srtp_enc_chain (GstPad * pad, GstObject * parent, GstBuffer * buf,
GST_OBJECT_UNLOCK (filter);
out:
gst_buffer_unref (buf);
return ret;
fail:
ret = GST_FLOW_ERROR;
goto out;
}
static gboolean
@ -1152,15 +1158,17 @@ process_buffer_it (GstBuffer ** buffer, guint index, gpointer user_data)
{
ProcessBufferItData *data = user_data;
GstBuffer *bufout;
GstFlowReturn ret;
if ((bufout =
gst_srtp_enc_process_buffer (data->filter, data->pad, *buffer,
data->is_rtcp))) {
gst_buffer_list_add (data->out_list, bufout);
} else {
GST_WARNING_OBJECT (data->filter, "Error encoding buffer, dropping");
ret = gst_srtp_enc_process_buffer (data->filter, data->pad, *buffer,
data->is_rtcp, &bufout);
if (ret != GST_FLOW_OK) {
data->flowret = ret;
return FALSE;
}
gst_buffer_list_add (data->out_list, bufout);
return TRUE;
}
@ -1199,8 +1207,12 @@ gst_srtp_enc_chain_list (GstPad * pad, GstObject * parent,
process_data.pad = pad;
process_data.is_rtcp = is_rtcp;
process_data.out_list = out_list;
process_data.flowret = GST_FLOW_OK;
gst_buffer_list_foreach (buf_list, process_buffer_it, &process_data);
if (!gst_buffer_list_foreach (buf_list, process_buffer_it, &process_data)) {
ret = process_data.flowret;
goto out;
}
if (!gst_buffer_list_length (out_list)) {
gst_buffer_list_unref (out_list);