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urisourcebin: Never push actual EOS event to slot

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Due to the special nature of adaptivedemux, reconfigure happens
frequently with seek/track-change.
In very exceptional cases, the following sequence is possible:
  * EOS event is pushed to queue element and still buffers are queued
  * During draining remaining buffers, reconfiguration downstream
happens due to track switch.
  * The queue gets a not-linked flow return from downstream
  * Because the sinkpad is EOS, the queue registers an
    error on the bus, causing the pipeline to fail.

Avoid the sinkpad getting marked EOS in the first place, by using a
custom event in place of EOS.

https://bugzilla.gnome.org/show_bug.cgi?id=777009
This commit is contained in:
Seungha Yang 2017-01-08 21:36:04 +09:00 committed by Jan Schmidt
parent 68565ec0fc
commit c10e7c5011
1 changed files with 47 additions and 50 deletions
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97
gst/playback/gsturisourcebin.c
View file

@ -1065,6 +1065,7 @@ demux_pad_events (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GstURISourceBin *urisrc = GST_URI_SOURCE_BIN (user_data);
ChildSrcPadInfo *child_info;
GstPadProbeReturn ret = GST_PAD_PROBE_OK;
if (!(child_info =
g_object_get_data (G_OBJECT (pad), "urisourcebin.srcpadinfo")))
@ -1079,22 +1080,28 @@ demux_pad_events (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
if (GST_IS_EVENT (GST_PAD_PROBE_INFO_DATA (info))) {
GstEvent *ev = GST_PAD_PROBE_INFO_EVENT (info);
if (GST_EVENT_TYPE (ev) == GST_EVENT_EOS && urisrc->pending_pads) {
if (GST_EVENT_TYPE (ev) == GST_EVENT_EOS) {
GstEvent *event;
GstStructure *s;
GST_LOG_OBJECT (urisrc, "EOS on pad %" GST_PTR_FORMAT, pad);
if (!link_pending_pad_to_output (urisrc, child_info->output_slot)) {
GstEvent *event;
GstStructure *s;
/* Mark that we fed an EOS to this slot */
child_info->output_slot->is_eos = TRUE;
/* never forward actual EOS to slot */
ret = GST_PAD_PROBE_DROP;
/* Actually feed a custom EOS event to avoid marking pads as EOSed */
s = gst_structure_new_empty ("urisourcebin-custom-eos");
event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, s);
gst_pad_send_event (child_info->output_slot->sinkpad, event);
if ((urisrc->pending_pads &&
link_pending_pad_to_output (urisrc, child_info->output_slot))) {
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
goto done;
}
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
return GST_PAD_PROBE_HANDLED;
/* Mark that we fed an EOS to this slot */
child_info->output_slot->is_eos = TRUE;
/* Actually feed a custom EOS event to avoid marking pads as EOSed */
s = gst_structure_new_empty ("urisourcebin-custom-eos");
event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, s);
gst_pad_send_event (child_info->output_slot->sinkpad, event);
} else if (GST_EVENT_TYPE (ev) == GST_EVENT_CAPS) {
GstCaps *caps;
gst_event_parse_caps (ev, &caps);
@ -1104,7 +1111,7 @@ demux_pad_events (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
done:
return GST_PAD_PROBE_OK;
return ret;
}
/* Called with lock held */
@ -1244,21 +1251,18 @@ source_pad_event_probe (GstPad * pad, GstPadProbeInfo * info,
OutputSlotInfo *slot;
GST_DEBUG_OBJECT (pad, "we received EOS");
/* Check the slot is still unlinked - maybe it got
* re-linked and we should drop this EOS */
GST_URI_SOURCE_BIN_LOCK (urisrc);
slot = g_object_get_data (G_OBJECT (pad), "urisourcebin.slotinfo");
if (slot && slot->linked_info) {
GST_DEBUG_OBJECT (pad,
"EOS pad was re-linked to pending pad, so removing EOS status");
slot->is_eos = FALSE;
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
return GST_PAD_PROBE_HANDLED;
}
/* Otherwise it's time to send EOS and clean up this pad */
slot = g_object_get_data (G_OBJECT (pad), "urisourcebin.slotinfo");
gst_pad_push_event (slot->srcpad, gst_event_new_eos ());
if (slot && slot->linked_info) {
/* Do not clear output slot yet */
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
return GST_PAD_PROBE_DROP;
}
free_output_slot_async (urisrc, slot);
/* FIXME: Only emit drained if all output pads are done and there's no
@ -1266,7 +1270,7 @@ source_pad_event_probe (GstPad * pad, GstPadProbeInfo * info,
g_signal_emit (urisrc, gst_uri_source_bin_signals[SIGNAL_DRAINED], 0, NULL);
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
return GST_PAD_PROBE_HANDLED;
return GST_PAD_PROBE_DROP;
}
/* never drop events */
return GST_PAD_PROBE_OK;
@ -1338,35 +1342,28 @@ pad_removed_cb (GstElement * element, GstPad * pad, GstURISourceBin * urisrc)
/* Send EOS to the output slot if the demuxer didn't already */
if (info->output_slot) {
if (!info->output_slot->is_eos) {
/* custom event cannot be posted to EOS pad */
if (GST_PAD_IS_EOS (info->output_slot->sinkpad)) {
GST_LOG_OBJECT (element,
"Pad %" GST_PTR_FORMAT " was removed with EOS.", pad);
if (urisrc->pending_pads &&
link_pending_pad_to_output (urisrc, info->output_slot)) {
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
return;
} else {
free_output_slot_async (urisrc, info->output_slot);
}
} else {
GstStructure *s;
GstEvent *event;
GstStructure *s;
GstEvent *event;
OutputSlotInfo *slot;
GST_LOG_OBJECT (element,
"Pad %" GST_PTR_FORMAT " was removed without EOS. Sending.", pad);
s = gst_structure_new_empty ("urisourcebin-custom-eos");
event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, s);
gst_pad_send_event (info->output_slot->sinkpad, event);
}
info->output_slot->is_eos = TRUE;
if (!info->output_slot->is_eos && urisrc->pending_pads &&
link_pending_pad_to_output (urisrc, info->output_slot)) {
GST_URI_SOURCE_BIN_UNLOCK (urisrc);
return;
}
/* After the pad goes away, the slot is free to reuse */
slot = info->output_slot;
info->output_slot->is_eos = TRUE;
info->output_slot->linked_info = NULL;
info->output_slot = NULL;
GST_LOG_OBJECT (element,
"Pad %" GST_PTR_FORMAT " was removed without EOS. Sending.", pad);
s = gst_structure_new_empty ("urisourcebin-custom-eos");
event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, s);
gst_pad_send_event (slot->sinkpad, event);
} else {
GST_LOG_OBJECT (urisrc, "Removed pad has no output slot");
}