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videotestsrc: Force alpha downstream if foreground color contains alpha

Browse source 
Otherwise the foreground color won't be fully represented in the
outputted frames.

https://bugzilla.gnome.org/show_bug.cgi?id=755482
This commit is contained in:
Thibault Saunier 2015-09-23 18:47:52 +02:00
parent 8051434c03
commit ab6b536a66
1 changed files with 64 additions and 1 deletions
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65
gst/videotestsrc/gstvideotestsrc.c
View file

@ -313,10 +313,73 @@ gst_video_test_src_init (GstVideoTestSrc * src)
static GstCaps *
gst_video_test_src_src_fixate (GstBaseSrc * bsrc, GstCaps * caps)
{
GstVideoTestSrc *src = GST_VIDEO_TEST_SRC (bsrc);
GstStructure *structure;
caps = gst_caps_make_writable (caps);
/* Check if foreground color has alpha, if it is the case,
* force color format with an alpha channel downstream */
if (src->foreground_color >> 24 != 255) {
guint i;
GstCaps *alpha_only_caps = gst_caps_new_empty ();
for (i = 0; i < gst_caps_get_size (caps); i++) {
const GstVideoFormatInfo *info;
const GValue *formats =
gst_structure_get_value (gst_caps_get_structure (caps, i),
"format");
if (GST_VALUE_HOLDS_LIST (formats)) {
GValue possible_formats = { 0, };
guint list_size = gst_value_list_get_size (formats);
guint index;
g_value_init (&possible_formats, GST_TYPE_LIST);
for (index = 0; index < list_size; index++) {
const GValue *list_item = gst_value_list_get_value (formats, index);
info =
gst_video_format_get_info (gst_video_format_from_string
(g_value_get_string (list_item)));
if (GST_VIDEO_FORMAT_INFO_HAS_ALPHA (info)) {
GValue tmp = { 0, };
gst_value_init_and_copy (&tmp, list_item);
gst_value_list_append_value (&possible_formats, &tmp);
}
}
if (gst_value_list_get_size (&possible_formats)) {
GstStructure *astruct =
gst_structure_copy (gst_caps_get_structure (caps, i));
gst_structure_set_value (astruct, "format", &possible_formats);
gst_caps_append_structure (alpha_only_caps, astruct);
}
} else if (G_VALUE_HOLDS_STRING (formats)) {
info =
gst_video_format_get_info (gst_video_format_from_string
(g_value_get_string (formats)));
if (GST_VIDEO_FORMAT_INFO_HAS_ALPHA (info)) {
gst_caps_append_structure (alpha_only_caps,
gst_structure_copy (gst_caps_get_structure (caps, i)));
}
} else {
g_assert_not_reached ();
GST_WARNING ("Unexpected type for video 'format' field: %s",
G_VALUE_TYPE_NAME (formats));
}
}
if (gst_caps_is_empty (alpha_only_caps)) {
GST_WARNING_OBJECT (src,
"Foreground color contains alpha, but downstream can't support alpha.");
} else {
gst_caps_replace (&caps, alpha_only_caps);
}
}
caps = gst_caps_make_writable (caps);
structure = gst_caps_get_structure (caps, 0);
gst_structure_fixate_field_nearest_int (structure, "width", 320);