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docs: plugin development: add example for enum property

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7859>
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Tom Schuring 2022-02-03 12:08:02 +00:00 committed by GStreamer Marge Bot
parent 7112f1b874
commit 1a9ecaeec9
1 changed files with 45 additions and 0 deletions
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45
subprojects/gst-docs/markdown/plugin-development/basics/args.md
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@ -141,13 +141,58 @@ gst_videotestsrc_pattern_get_type (void)
static void static void
gst_videotestsrc_class_init (GstvideotestsrcClass *klass) gst_videotestsrc_class_init (GstvideotestsrcClass *klass)
{ {
/* define virtual function pointers */
object_class->set_property = gst_my_filter_set_property;
object_class->get_property = gst_my_filter_get_property;
[..] [..]
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_PATTERN, g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_PATTERN,
g_param_spec_enum ("pattern", "Pattern", g_param_spec_enum ("pattern", "Pattern",
"Type of test pattern to generate", "Type of test pattern to generate",
GST_TYPE_VIDEOTESTSRC_PATTERN, GST_VIDEOTESTSRC_SMPTE, GST_TYPE_VIDEOTESTSRC_PATTERN, GST_VIDEOTESTSRC_SMPTE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
[..] [..]
} }
[..]
static void
gst_my_filter_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GstMyFilter *filter = GST_MY_FILTER (object);
switch (prop_id) {
case PROP_PATTERN:
filter->video_test_pattern = (GstVideotestsrcPattern)g_value_get_enum(value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_my_filter_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GstMyFilter *filter = GST_MY_FILTER (object);
switch (prop_id) {
case PROP_PATTERN:
g_value_set_enum (value, filter->video_test_pattern);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
``` ```