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qroverlay: Add a GstQROverlay meta

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2299>
This commit is contained in:
Thibault Saunier 2022-03-04 22:00:18 +00:00 committed by GStreamer Marge Bot
parent 5b11e6a3d0
commit 1b31a2af45
1 changed files with 41 additions and 0 deletions
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41
subprojects/gst-plugins-bad/ext/qroverlay/gstqroverlay.c
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@ -30,6 +30,15 @@
* ``` bash
* gst-launch -v -m videotestsrc ! qroverlay ! fakesink silent=TRUE
* ```
* Since 1.22 the `qroverlay` element also supports a #GstCustomMeta called
* `GstQROverlayMeta` which allows upstream elements to set the data to be
* rendered on the buffers that flow through it. This custom meta
* #GstStructure has the following fields:
*
* * #gchar* `data` (**mandatory**): The data to use to render the qrcode.
* * #gboolean `keep_data` (**mandatory**): Set to %TRUE if the data from that
* metadata should be used as #qroverlay:data
*
*
* Since: 1.20
*/
@ -76,6 +85,34 @@ get_qrcode_content (GstBaseQROverlay * base, GstBuffer * buf,
gchar *content;
GstQROverlay *self = GST_QR_OVERLAY (base);
GstCustomMeta *meta = gst_buffer_get_custom_meta (buf, "GstQROverlayMeta");
if (meta) {
gchar *data;
GstStructure *structure =
gst_custom_meta_get_structure ((GstCustomMeta *) meta);
if (gst_structure_get (structure, "data", G_TYPE_STRING, &data, NULL)) {
gboolean keep_data;
GST_OBJECT_LOCK (self);
self->data_changed = TRUE;
if (gst_structure_get_boolean (structure, "keep_data", &keep_data)
&& keep_data) {
g_free (self->data);
self->data = g_strdup (self->data);
}
GST_OBJECT_UNLOCK (self);
*reuse_prev = FALSE;
return data;
}
GST_WARNING_OBJECT (self,
"Got a GstQROverlayMeta without a 'data' field in its struct");
}
GST_OBJECT_LOCK (self);
content = g_strdup (self->data);
*reuse_prev = self->data_changed;
@ -124,10 +161,12 @@ gst_qr_overlay_class_init (GstQROverlayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
static const gchar *tags[] = { NULL };
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->set_property = gst_qr_overlay_set_property;
gobject_class->get_property = gst_qr_overlay_get_property;
@ -137,6 +176,8 @@ gst_qr_overlay_class_init (GstQROverlayClass * klass)
"Overlay Qrcodes over each buffer with data passed in",
"Thibault Saunier <tsaunier@igalia.com>");
gst_meta_register_custom ("GstQROverlayMeta", tags, NULL, NULL, NULL);
g_object_class_install_property (gobject_class,
PROP_DATA, g_param_spec_string ("data",
"Data",