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decodebin3: Always ensure we end up with parsebin or identity

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This fixes a regression introduced by 6c4f52ea20

There are cases where the input stream will be push-based, time-segment and not
have a collection nor caps. This means the event-based checks are not sufficient
to decide when/where to plug in a identity or parsebin to process the input.

For those corner cases we setup a buffer probe to ensure we always end up with
at least a parsebin

Fixes #3609

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7018>
This commit is contained in:
Edward Hervey 2024-06-10 14:56:00 +02:00 committed by Backport Bot
parent 9380f313c3
commit c1ec23a75e
1 changed files with 46 additions and 0 deletions
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46
subprojects/gst-plugins-base/gst/playback/gstdecodebin3.c
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@ -376,6 +376,9 @@ struct _DecodebinInput
/* List of events that need to be pushed once we get the first
* GST_EVENT_STREAM_COLLECTION */
GList *events_waiting_for_collection;
/* input buffer probe for detecting whether input has caps or not */
gulong input_probe;
};
/* Streams that come from parsebin or identity */
@ -1627,6 +1630,23 @@ no_parsebin:
}
}
static GstPadProbeReturn
input_pad_buffer_probe (GstPad * pad, GstPadProbeInfo * info,
gpointer user_data)
{
DecodebinInput *input = user_data;
INPUT_LOCK (input->dbin);
if (!input->parsebin && !input->identity) {
GST_DEBUG_OBJECT (pad, "Push-stream without caps, setting up identity");
gst_decodebin_input_ensure_parsebin (input);
}
input->input_probe = 0;
INPUT_UNLOCK (input->dbin);
return GST_PAD_PROBE_REMOVE;
};
static GstPadLinkReturn
gst_decodebin3_input_pad_link (GstPad * pad, GstObject * parent, GstPad * peer)
{
@ -1662,6 +1682,15 @@ gst_decodebin3_input_pad_link (GstPad * pad, GstObject * parent, GstPad * peer)
"Can't reconfigure input from push-based to pull-based");
res = GST_PAD_LINK_REFUSED;
}
} else if (input->input_probe == 0) {
/* We setup a buffer probe to handle the corner case of push-based
* time-based inputs without CAPS/COLLECTION. If we get a buffer without
* having figured out if we need identity or parsebin, we will plug in
* parsebin */
GST_DEBUG_OBJECT (pad, "Setting up buffer probe");
input->input_probe =
gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_BUFFER,
input_pad_buffer_probe, input, NULL);
}
/* Clear stream-collection corresponding to current INPUT. We do not
@ -1880,6 +1909,11 @@ gst_decodebin_input_reset (DecodebinInput * input)
if (input->collection)
gst_clear_object (&input->collection);
if (input->input_probe) {
gst_pad_remove_probe (input->ghost_sink, input->input_probe);
input->input_probe = 0;
}
g_list_free_full (input->events_waiting_for_collection,
(GDestroyNotify) gst_event_unref);
input->events_waiting_for_collection = NULL;
@ -2090,6 +2124,12 @@ sink_event_function (GstPad * sinkpad, GstDecodebin3 * dbin, GstEvent * event)
if (!input->parsebin && !input->identity)
gst_decodebin_input_setup_identity (input);
/* Remove buffer probe for caps/collection detection */
if (input->input_probe) {
gst_pad_remove_probe (sinkpad, input->input_probe);
input->input_probe = 0;
}
/* Drain all pending events */
if (input->events_waiting_for_collection) {
GList *tmp;
@ -2109,6 +2149,12 @@ sink_event_function (GstPad * sinkpad, GstDecodebin3 * dbin, GstEvent * event)
break;
GST_DEBUG_OBJECT (sinkpad, "new caps %" GST_PTR_FORMAT, newcaps);
/* Remove buffer probe for caps/collection detection */
if (input->input_probe) {
gst_pad_remove_probe (sinkpad, input->input_probe);
input->input_probe = 0;
}
/* No parsebin or identity present, check if we can avoid creating one */
if (!input->parsebin && !input->identity) {
if (gst_decodebin_input_requires_parsebin (input, newcaps)) {