2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3 * Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
6 * Copyright (C) 2001-2002 FUKUCHI Kentarou
8 * EdgeTV - detects edge and display it in good old computer way
10 * EffecTV is free software. This library is free software;
11 * you can redistribute it and/or
12 * modify it under the terms of the GNU Library General Public
13 * License as published by the Free Software Foundation; either
14 * version 2 of the License, or (at your option) any later version.
16 * This library is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Library General Public License for more details.
21 * You should have received a copy of the GNU Library General Public
22 * License along with this library; if not, write to the
23 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 * Boston, MA 02111-1307, USA.
35 #include <gst/video/video.h>
37 GST_BOILERPLATE (GstEdgeTV, gst_edgetv, GstVideoFilter, GST_TYPE_VIDEO_FILTER);
39 static GstStaticPadTemplate gst_edgetv_src_template =
40 GST_STATIC_PAD_TEMPLATE ("src",
43 GST_STATIC_CAPS (GST_VIDEO_CAPS_BGRx)
46 static GstStaticPadTemplate gst_edgetv_sink_template =
47 GST_STATIC_PAD_TEMPLATE ("sink",
50 GST_STATIC_CAPS (GST_VIDEO_CAPS_BGRx)
54 gst_edgetv_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
57 GstEdgeTV *edgetv = GST_EDGETV (btrans);
58 GstStructure *structure;
61 structure = gst_caps_get_structure (incaps, 0);
63 if (gst_structure_get_int (structure, "width", &edgetv->width) &&
64 gst_structure_get_int (structure, "height", &edgetv->height)) {
67 edgetv->map_width = edgetv->width / 4;
68 edgetv->map_height = edgetv->height / 4;
69 edgetv->video_width_margin = edgetv->width % 4;
71 map_size = edgetv->map_width * edgetv->map_height * sizeof (guint32) * 2;
74 edgetv->map = (guint32 *) g_malloc0 (map_size);
82 gst_edgetv_transform (GstBaseTransform * trans, GstBuffer * in, GstBuffer * out)
84 GstEdgeTV *filter = GST_EDGETV (trans);
88 guint32 v0, v1, v2, v3;
89 GstFlowReturn ret = GST_FLOW_OK;
91 src = (guint32 *) GST_BUFFER_DATA (in);
92 dest = (guint32 *) GST_BUFFER_DATA (out);
94 src += filter->width * 4 + 4;
95 dest += filter->width * 4 + 4;
97 for (y = 1; y < filter->map_height - 1; y++) {
98 for (x = 1; x < filter->map_width - 1; x++) {
102 /* difference between the current pixel and right neighbor. */
103 r = ((p & 0xff0000) - (q & 0xff0000)) >> 16;
104 g = ((p & 0xff00) - (q & 0xff00)) >> 8;
105 b = (p & 0xff) - (q & 0xff);
109 r = r >> 5; /* To lack the lower bit for saturated addition, */
110 g = g >> 5; /* devide the value with 32, instead of 16. It is */
111 b = b >> 4; /* same as `v2 &= 0xfefeff' */
118 v2 = (r << 17) | (g << 9) | b;
120 /* difference between the current pixel and upper neighbor. */
121 q = *(src - filter->width * 4);
122 r = ((p & 0xff0000) - (q & 0xff0000)) >> 16;
123 g = ((p & 0xff00) - (q & 0xff00)) >> 8;
124 b = (p & 0xff) - (q & 0xff);
137 v3 = (r << 17) | (g << 9) | b;
139 v0 = filter->map[(y - 1) * filter->map_width * 2 + x * 2];
140 v1 = filter->map[y * filter->map_width * 2 + (x - 1) * 2 + 1];
141 filter->map[y * filter->map_width * 2 + x * 2] = v2;
142 filter->map[y * filter->map_width * 2 + x * 2 + 1] = v3;
145 dest[0] = r | (g - (g >> 8));
148 dest[1] = r | (g - (g >> 8));
153 dest[filter->width] = r | (g - (g >> 8));
156 dest[filter->width + 1] = r | (g - (g >> 8));
157 dest[filter->width + 2] = v3;
158 dest[filter->width + 3] = v3;
159 dest[filter->width * 2] = v2;
160 dest[filter->width * 2 + 1] = v2;
161 dest[filter->width * 3] = v2;
162 dest[filter->width * 3 + 1] = v2;
167 src += filter->width * 3 + 8 + filter->video_width_margin;
168 dest += filter->width * 3 + 8 + filter->video_width_margin;
175 gst_edgetv_start (GstBaseTransform * trans)
177 GstEdgeTV *edgetv = GST_EDGETV (trans);
180 memset (edgetv->map, 0,
181 edgetv->map_width * edgetv->map_height * sizeof (guint32) * 2);
186 gst_edgetv_finalize (GObject * object)
188 GstEdgeTV *edgetv = GST_EDGETV (object);
190 g_free (edgetv->map);
193 G_OBJECT_CLASS (parent_class)->finalize (object);
197 gst_edgetv_base_init (gpointer g_class)
199 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
201 gst_element_class_set_details_simple (element_class, "EdgeTV effect",
202 "Filter/Effect/Video",
203 "Apply edge detect on video", "Wim Taymans <wim.taymans@chello.be>");
205 gst_element_class_add_pad_template (element_class,
206 gst_static_pad_template_get (&gst_edgetv_sink_template));
207 gst_element_class_add_pad_template (element_class,
208 gst_static_pad_template_get (&gst_edgetv_src_template));
212 gst_edgetv_class_init (GstEdgeTVClass * klass)
214 GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
215 GObjectClass *gobject_class = (GObjectClass *) klass;
217 gobject_class->finalize = gst_edgetv_finalize;
219 trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_edgetv_set_caps);
220 trans_class->transform = GST_DEBUG_FUNCPTR (gst_edgetv_transform);
221 trans_class->start = GST_DEBUG_FUNCPTR (gst_edgetv_start);
225 gst_edgetv_init (GstEdgeTV * edgetv, GstEdgeTVClass * klass)