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ffmpegcolorspace: Prefer transforming alpha formats to alpha formats and the other way around

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Fixes bug #602834 and #350748.
This commit is contained in:
Sebastian Dröge 2009-11-25 16:17:13 +01:00
parent 9339cec787
commit 1fe9f49691
1 changed files with 65 additions and 2 deletions
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67
gst/ffmpegcolorspace/gstffmpegcolorspace.c
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@ -133,6 +133,28 @@ gst_ffmpegcsp_caps_remove_format_info (GstCaps * caps)
return caps;
}
static gboolean
gst_ffmpegcsp_structure_is_alpha (GstStructure * s)
{
const gchar *name;
name = gst_structure_get_name (s);
if (g_str_equal (name, "video/x-raw-rgb")) {
return gst_structure_has_field (s, "alpha_mask");
} else if (g_str_equal (name, "video/x-raw-yuv")) {
guint32 fourcc;
if (!gst_structure_get_fourcc (s, "format", &fourcc))
return FALSE;
return (fourcc == GST_MAKE_FOURCC ('A', 'Y', 'U', 'V'));
}
return FALSE;
}
/* The caps can be transformed into any other caps with format info removed.
* However, we should prefer passthrough, so if passthrough is possible,
* put it first in the list. */
@ -141,13 +163,54 @@ gst_ffmpegcsp_transform_caps (GstBaseTransform * btrans,
GstPadDirection direction, GstCaps * caps)
{
GstCaps *template;
GstCaps *tmp, *tmp2;
GstCaps *result;
guint i, n;
gboolean is_alpha;
GstStructure *s;
GstCaps *alpha, *non_alpha;
s = gst_caps_get_structure (caps, 0);
is_alpha = gst_ffmpegcsp_structure_is_alpha (s);
template = gst_ffmpegcsp_codectype_to_caps (CODEC_TYPE_VIDEO, NULL);
result = gst_caps_intersect (caps, template);
gst_caps_unref (template);
gst_caps_append (result, gst_ffmpegcsp_caps_remove_format_info (caps));
/* Get all possible caps that we can transform to */
tmp = gst_ffmpegcsp_caps_remove_format_info (caps);
tmp2 = gst_caps_intersect (tmp, template);
gst_caps_unref (template);
gst_caps_unref (tmp);
tmp = tmp2;
/* Now move alpha formats to the beginning if caps is an alpha format
* or at the end if caps is no alpha format */
n = gst_caps_get_size (tmp);
alpha = gst_caps_new_empty ();
non_alpha = gst_caps_new_empty ();
for (i = 0; i < n; i++) {
s = gst_caps_get_structure (tmp, i);
if (gst_ffmpegcsp_structure_is_alpha (s))
gst_caps_append_structure (alpha, gst_structure_copy (s));
else
gst_caps_append_structure (non_alpha, gst_structure_copy (s));
}
s = gst_caps_get_structure (caps, 0);
gst_caps_unref (tmp);
if (gst_ffmpegcsp_structure_is_alpha (s)) {
gst_caps_append (alpha, non_alpha);
tmp = alpha;
} else {
gst_caps_append (non_alpha, alpha);
tmp = non_alpha;
}
gst_caps_append (result, tmp);
GST_DEBUG_OBJECT (btrans, "transformed %" GST_PTR_FORMAT " into %"
GST_PTR_FORMAT, caps, result);