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/*
* GStreamer
* Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
* Copyright (c) 2020 Anthony Violo <anthony.violo@ubicast.eu>
* Copyright (c) 2020 Thibault Saunier <tsaunier@igalia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-qroverlay
*
* Element to set random data on a qroverlay.
*
* ## Example launch line
*
* ``` 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
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <json-glib/json-glib.h>
#include <qrencode.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "gstqroverlayelements.h"
#include "gstqroverlay.h"
enum
{
PROP_0,
PROP_DATA,
};
struct _GstQROverlay
{
GstBaseQROverlay parent;
gchar *data;
gboolean data_changed;
};
#define gst_qr_overlay_parent_class parent_class
G_DEFINE_TYPE (GstQROverlay, gst_qr_overlay, GST_TYPE_BASE_QR_OVERLAY);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (qroverlay, "qroverlay", GST_RANK_NONE,
GST_TYPE_QR_OVERLAY, qroverlay_element_init (plugin));
static gchar *
get_qrcode_content (GstBaseQROverlay * base, GstBuffer * buf,
GstVideoInfo * info, gboolean * reuse_prev)
{
gchar *content;
GstQROverlay *self = GST_QR_OVERLAY (base);
GstCustomMeta *meta = gst_buffer_get_custom_meta (buf, "GstQROverlayMeta");
if (meta) {
gchar *data;
if (gst_structure_get (meta->structure, "data", G_TYPE_STRING, &data, NULL)) {
gboolean keep_data;
GST_OBJECT_LOCK (self);
self->data_changed = TRUE;
if (gst_structure_get_boolean (meta->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;
self->data_changed = FALSE;
GST_OBJECT_UNLOCK (self);
return content;
}
static void
gst_qr_overlay_finalize (GObject * object)
{
GstQROverlay *self = GST_QR_OVERLAY (object);
g_free (self->data);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_qr_overlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstQROverlay *self = GST_QR_OVERLAY (object);
switch (prop_id) {
case PROP_DATA:
GST_OBJECT_LOCK (self);
g_free (self->data);
self->data = g_value_dup_string (value);
self->data_changed = TRUE;
GST_OBJECT_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_qr_overlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstQROverlay *self = GST_QR_OVERLAY (object);
switch (prop_id) {
case PROP_DATA:
g_value_set_string (value, self->data);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_qr_overlay_class_init (GstQROverlayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = gst_qr_overlay_finalize;
gobject_class->set_property = gst_qr_overlay_set_property;
gobject_class->get_property = gst_qr_overlay_get_property;
gst_element_class_set_details_simple (gstelement_class,
"qroverlay",
"Qrcode overlay containing random data",
"Overlay Qrcodes over each buffer with data passed in",
"Thibault Saunier <tsaunier@igalia.com>");
gst_meta_register_custom_simple ("GstQROverlayMeta");
g_object_class_install_property (gobject_class,
PROP_DATA, g_param_spec_string ("data",
"Data",
"Data to write in the QRCode to be overlaid",
NULL,
G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
GST_PARAM_CONTROLLABLE));
GST_BASE_QR_OVERLAY_CLASS (klass)->get_content =
GST_DEBUG_FUNCPTR (get_qrcode_content);
}
/* initialize the new element
* initialize instance structure
*/
static void
gst_qr_overlay_init (GstQROverlay * filter)
{
}
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