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mpegvideoparse: 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 10:14:06 +01:00
parent 61fad46dca
commit dc2c61faf5
1 changed files with 34 additions and 0 deletions
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34
gst/videoparsers/gstmpegvideoparse.c
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@ -71,6 +71,7 @@ static gboolean gst_mpegv_parse_check_valid_frame (GstBaseParse * parse,
static GstFlowReturn gst_mpegv_parse_parse_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static gboolean gst_mpegv_parse_set_caps (GstBaseParse * parse, GstCaps * caps);
static GstCaps *gst_mpegv_parse_get_caps (GstBaseParse * parse);
static GstFlowReturn gst_mpegv_parse_pre_push_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
@ -166,6 +167,7 @@ gst_mpegv_parse_class_init (GstMpegvParseClass * klass)
GST_DEBUG_FUNCPTR (gst_mpegv_parse_check_valid_frame);
parse_class->parse_frame = GST_DEBUG_FUNCPTR (gst_mpegv_parse_parse_frame);
parse_class->set_sink_caps = GST_DEBUG_FUNCPTR (gst_mpegv_parse_set_caps);
parse_class->get_sink_caps = GST_DEBUG_FUNCPTR (gst_mpegv_parse_get_caps);
parse_class->pre_push_frame =
GST_DEBUG_FUNCPTR (gst_mpegv_parse_pre_push_frame);
}
@ -762,3 +764,35 @@ gst_mpegv_parse_set_caps (GstBaseParse * parse, GstCaps * caps)
/* let's not interfere and accept regardless of config parsing success */
return TRUE;
}
static GstCaps *
gst_mpegv_parse_get_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 parsed field */
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, "parsed");
}
res =
gst_caps_intersect_full (peercaps,
gst_pad_get_pad_template_caps (GST_BASE_PARSE_SINK_PAD (parse)),
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (peercaps);
} else {
res =
gst_caps_copy (gst_pad_get_pad_template_caps (GST_BASE_PARSE_SINK_PAD
(parse)));
}
return res;
}