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parsebin: Implement ACCEPT_CAPS handling

Browse source 
The default query handler would go through typefind, which by default accepts
any CAPS. But once configured, parsebin can't reconfigure itself, it should
therefore pass through the ACCEPT_CAPS query to the first element after
typefind (if any).

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1900>
This commit is contained in:
Edward Hervey 2022-01-21 14:52:07 +01:00 committed by Edward Hervey
parent 52d9614d47
commit 9b94798d0b
1 changed files with 49 additions and 0 deletions
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49
subprojects/gst-plugins-base/gst/playback/gstparsebin.c
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@ -411,6 +411,8 @@ struct _GstParseChain
GList *old_groups; /* Groups that should be freed later */
};
static gboolean gst_parse_chain_accept_caps (GstParseChain * chain,
GstCaps * caps);
static void gst_parse_chain_free (GstParseChain * chain);
static GstParseChain *gst_parse_chain_new (GstParseBin * parsebin,
GstParseGroup * group, GstPad * pad, GstCaps * start_caps);
@ -855,6 +857,24 @@ gst_parse_bin_update_factories_list (GstParseBin * parsebin)
}
}
static gboolean
sink_query_function (GstPad * sinkpad, GstParseBin * parsebin, GstQuery * query)
{
GST_DEBUG_OBJECT (parsebin, "query %" GST_PTR_FORMAT, query);
if (parsebin->parse_chain && GST_QUERY_TYPE (query) == GST_QUERY_ACCEPT_CAPS) {
GstCaps *querycaps = NULL;
gst_query_parse_accept_caps (query, &querycaps);
if (querycaps) {
gboolean ret =
gst_parse_chain_accept_caps (parsebin->parse_chain, querycaps);
gst_query_set_accept_caps_result (query, ret);
}
return TRUE;
}
return gst_pad_query_default (sinkpad, GST_OBJECT (parsebin), query);
}
static void
gst_parse_bin_init (GstParseBin * parse_bin)
{
@ -885,6 +905,8 @@ gst_parse_bin_init (GstParseBin * parse_bin)
/* ghost the sink pad to ourself */
gpad = gst_ghost_pad_new_from_template ("sink", pad, pad_tmpl);
gst_pad_set_query_function (gpad,
(GstPadQueryFunction) sink_query_function);
gst_pad_set_active (gpad, TRUE);
gst_element_add_pad (GST_ELEMENT (parse_bin), gpad);
@ -3083,6 +3105,33 @@ chain_remove_old_groups (GstParseChain * chain)
}
}
static gboolean
gst_parse_chain_accept_caps (GstParseChain * chain, GstCaps * caps)
{
GstParseElement *initial_element;
GList *lastlist;
GstPad *sink;
gboolean ret;
if (!chain->elements)
return TRUE;
lastlist = g_list_last (chain->elements);
initial_element = lastlist->data;
GST_DEBUG_OBJECT (chain->parsebin, "element %s caps %" GST_PTR_FORMAT,
GST_ELEMENT_NAME (initial_element->element), caps);
sink = gst_element_get_static_pad (initial_element->element, "sink");
ret = gst_pad_query_accept_caps (sink, caps);
gst_object_unref (sink);
GST_DEBUG_OBJECT (chain->parsebin, "Chain can%s handle caps",
ret ? "" : " NOT");
return ret;
}
static gboolean
drain_and_switch_chains (GstParseChain * chain, GstParsePad * drainpad,
gboolean * last_group, gboolean * drained, gboolean * switched);