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ac3parse: Implement ::get_sink_caps vfunc to propagate downstream caps constraints upstream

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This commit is contained in:
Sebastian Dröge 2011-11-24 09:48:33 +01:00
parent 48b07ae434
commit fabc5c969b
1 changed files with 37 additions and 1 deletions
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38
gst/audioparsers/gstac3parse.c
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@ -165,6 +165,7 @@ static GstFlowReturn gst_ac3_parse_parse_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static gboolean gst_ac3_parse_src_event (GstBaseParse * parse,
GstEvent * event);
static GstCaps *gst_ac3_parse_get_sink_caps (GstBaseParse * parse);
GST_BOILERPLATE (GstAc3Parse, gst_ac3_parse, GstBaseParse, GST_TYPE_BASE_PARSE);
@ -199,8 +200,8 @@ gst_ac3_parse_class_init (GstAc3ParseClass * klass)
parse_class->check_valid_frame =
GST_DEBUG_FUNCPTR (gst_ac3_parse_check_valid_frame);
parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_ac3_parse_parse_frame);
parse_class->src_event = GST_DEBUG_FUNCPTR (gst_ac3_parse_src_event);
parse_class->get_sink_caps = GST_DEBUG_FUNCPTR (gst_ac3_parse_get_sink_caps);
}
static void
@ -662,3 +663,38 @@ gst_ac3_parse_src_event (GstBaseParse * parse, GstEvent * event)
return GST_BASE_PARSE_CLASS (parent_class)->src_event (parse, event);
}
static GstCaps *
gst_ac3_parse_get_sink_caps (GstBaseParse * parse)
{
GstCaps *peercaps;
GstCaps *res;
peercaps = gst_pad_get_allowed_caps (GST_BASE_PARSE_SRC_PAD (parse));
if (peercaps) {
guint i, n;
/* Remove the framed and alignment field. We can convert
* between different alignments. */
peercaps = gst_caps_make_writable (peercaps);
n = gst_caps_get_size (peercaps);
for (i = 0; i < n; i++) {
GstStructure *s = gst_caps_get_structure (peercaps, i);
gst_structure_remove_field (s, "framed");
gst_structure_remove_field (s, "alignment");
}
res =
gst_caps_intersect_full (peercaps,
gst_pad_get_pad_template_caps (GST_BASE_PARSE_SRC_PAD (parse)),
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (peercaps);
} else {
res =
gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_PARSE_SRC_PAD
(parse)));
}
return res;
}