1 /* GStreamer
2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3 * Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
4 *
5 * EffecTV:
6 * Copyright (C) 2001-2002 FUKUCHI Kentarou
7 *
8 * EdgeTV - detects edge and display it in good old computer way
9 *
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.
15 *
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.
20 *
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., 51 Franklin St, Fifth Floor,
24 * Boston, MA 02110-1301, USA.
25 */
26
27 /**
28 * SECTION:element-edgetv
29 *
30 * EdgeTV detects edges and display it in good old low resolution
31 * computer way.
32 *
33 * <refsect2>
34 * <title>Example launch line</title>
35 * |[
36 * gst-launch-1.0 -v videotestsrc ! edgetv ! videoconvert ! autovideosink
37 * ]| This pipeline shows the effect of edgetv on a test stream.
38 * </refsect2>
39 */
40
41 #ifdef HAVE_CONFIG_H
42 #include "config.h"
43 #endif
44
45 #include <string.h>
46
47 #include "gstedge.h"
48
49 #define gst_edgetv_parent_class parent_class
50 G_DEFINE_TYPE (GstEdgeTV, gst_edgetv, GST_TYPE_VIDEO_FILTER);
51
52 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
53 #define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ BGRx, RGBx }")
54 #else
55 #define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ xBGR, xRGB }")
56 #endif
57
58 static GstStaticPadTemplate gst_edgetv_src_template =
59 GST_STATIC_PAD_TEMPLATE ("src",
60 GST_PAD_SRC,
61 GST_PAD_ALWAYS,
62 GST_STATIC_CAPS (CAPS_STR)
63 );
64
65 static GstStaticPadTemplate gst_edgetv_sink_template =
66 GST_STATIC_PAD_TEMPLATE ("sink",
67 GST_PAD_SINK,
68 GST_PAD_ALWAYS,
69 GST_STATIC_CAPS (CAPS_STR)
70 );
71
72 static gboolean
gst_edgetv_set_info(GstVideoFilter * filter,GstCaps * incaps,GstVideoInfo * in_info,GstCaps * outcaps,GstVideoInfo * out_info)73 gst_edgetv_set_info (GstVideoFilter * filter, GstCaps * incaps,
74 GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
75 {
76 GstEdgeTV *edgetv = GST_EDGETV (filter);
77 guint map_size;
78 gint width, height;
79
80 width = GST_VIDEO_INFO_WIDTH (in_info);
81 height = GST_VIDEO_INFO_HEIGHT (in_info);
82
83 edgetv->map_width = width / 4;
84 edgetv->map_height = height / 4;
85 edgetv->video_width_margin = width % 4;
86
87 map_size = edgetv->map_width * edgetv->map_height * sizeof (guint32) * 2;
88
89 g_free (edgetv->map);
90 edgetv->map = (guint32 *) g_malloc0 (map_size);
91
92 return TRUE;
93 }
94
95 static GstFlowReturn
gst_edgetv_transform_frame(GstVideoFilter * vfilter,GstVideoFrame * in_frame,GstVideoFrame * out_frame)96 gst_edgetv_transform_frame (GstVideoFilter * vfilter, GstVideoFrame * in_frame,
97 GstVideoFrame * out_frame)
98 {
99 GstEdgeTV *filter = GST_EDGETV (vfilter);
100 gint x, y, r, g, b;
101 guint32 *src, *dest;
102 guint32 p, q;
103 guint32 v0, v1, v2, v3;
104 gint width, map_height, map_width;
105 gint video_width_margin;
106 guint32 *map;
107 GstFlowReturn ret = GST_FLOW_OK;
108
109 map = filter->map;
110 map_height = filter->map_height;
111 map_width = filter->map_width;
112 video_width_margin = filter->video_width_margin;
113
114 src = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
115 dest = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);
116
117 width = GST_VIDEO_FRAME_WIDTH (in_frame);
118
119 src += width * 4 + 4;
120 dest += width * 4 + 4;
121
122 for (y = 1; y < map_height - 1; y++) {
123 for (x = 1; x < map_width - 1; x++) {
124 p = *src;
125 q = *(src - 4);
126
127 /* difference between the current pixel and left neighbor. */
128 r = ((p & 0xff0000) - (q & 0xff0000)) >> 16;
129 g = ((p & 0xff00) - (q & 0xff00)) >> 8;
130 b = (p & 0xff) - (q & 0xff);
131 r *= r;
132 g *= g;
133 b *= b;
134 r = r >> 5; /* To lack the lower bit for saturated addition, */
135 g = g >> 5; /* devide the value with 32, instead of 16. It is */
136 b = b >> 4; /* same as `v2 &= 0xfefeff' */
137 if (r > 127)
138 r = 127;
139 if (g > 127)
140 g = 127;
141 if (b > 255)
142 b = 255;
143 v2 = (r << 17) | (g << 9) | b;
144
145 /* difference between the current pixel and upper neighbor. */
146 q = *(src - width * 4);
147 r = ((p & 0xff0000) - (q & 0xff0000)) >> 16;
148 g = ((p & 0xff00) - (q & 0xff00)) >> 8;
149 b = (p & 0xff) - (q & 0xff);
150 r *= r;
151 g *= g;
152 b *= b;
153 r = r >> 5;
154 g = g >> 5;
155 b = b >> 4;
156 if (r > 127)
157 r = 127;
158 if (g > 127)
159 g = 127;
160 if (b > 255)
161 b = 255;
162 v3 = (r << 17) | (g << 9) | b;
163
164 v0 = map[(y - 1) * map_width * 2 + x * 2];
165 v1 = map[y * map_width * 2 + (x - 1) * 2 + 1];
166 map[y * map_width * 2 + x * 2] = v2;
167 map[y * map_width * 2 + x * 2 + 1] = v3;
168 r = v0 + v1;
169 g = r & 0x01010100;
170 dest[0] = r | (g - (g >> 8));
171 r = v0 + v3;
172 g = r & 0x01010100;
173 dest[1] = r | (g - (g >> 8));
174 dest[2] = v3;
175 dest[3] = v3;
176 r = v2 + v1;
177 g = r & 0x01010100;
178 dest[width] = r | (g - (g >> 8));
179 r = v2 + v3;
180 g = r & 0x01010100;
181 dest[width + 1] = r | (g - (g >> 8));
182 dest[width + 2] = v3;
183 dest[width + 3] = v3;
184 dest[width * 2] = v2;
185 dest[width * 2 + 1] = v2;
186 dest[width * 2 + 2] = 0;
187 dest[width * 2 + 3] = 0;
188 dest[width * 3] = v2;
189 dest[width * 3 + 1] = v2;
190 dest[width * 3 + 2] = 0;
191 dest[width * 3 + 3] = 0;
192
193 src += 4;
194 dest += 4;
195 }
196 src += width * 3 + 8 + video_width_margin;
197 dest += width * 3 + 8 + video_width_margin;
198 }
199
200 return ret;
201 }
202
203 static gboolean
gst_edgetv_start(GstBaseTransform * trans)204 gst_edgetv_start (GstBaseTransform * trans)
205 {
206 GstEdgeTV *edgetv = GST_EDGETV (trans);
207
208 if (edgetv->map)
209 memset (edgetv->map, 0,
210 edgetv->map_width * edgetv->map_height * sizeof (guint32) * 2);
211 return TRUE;
212 }
213
214 static void
gst_edgetv_finalize(GObject * object)215 gst_edgetv_finalize (GObject * object)
216 {
217 GstEdgeTV *edgetv = GST_EDGETV (object);
218
219 g_free (edgetv->map);
220 edgetv->map = NULL;
221
222 G_OBJECT_CLASS (parent_class)->finalize (object);
223 }
224
225 static void
gst_edgetv_class_init(GstEdgeTVClass * klass)226 gst_edgetv_class_init (GstEdgeTVClass * klass)
227 {
228 GObjectClass *gobject_class = (GObjectClass *) klass;
229 GstElementClass *gstelement_class = (GstElementClass *) klass;
230 GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
231 GstVideoFilterClass *vfilter_class = (GstVideoFilterClass *) klass;
232
233 gobject_class->finalize = gst_edgetv_finalize;
234
235 gst_element_class_set_static_metadata (gstelement_class, "EdgeTV effect",
236 "Filter/Effect/Video",
237 "Apply edge detect on video", "Wim Taymans <wim.taymans@chello.be>");
238
239 gst_element_class_add_static_pad_template (gstelement_class,
240 &gst_edgetv_sink_template);
241 gst_element_class_add_static_pad_template (gstelement_class,
242 &gst_edgetv_src_template);
243
244 trans_class->start = GST_DEBUG_FUNCPTR (gst_edgetv_start);
245
246 vfilter_class->set_info = GST_DEBUG_FUNCPTR (gst_edgetv_set_info);
247 vfilter_class->transform_frame =
248 GST_DEBUG_FUNCPTR (gst_edgetv_transform_frame);
249 }
250
251 static void
gst_edgetv_init(GstEdgeTV * edgetv)252 gst_edgetv_init (GstEdgeTV * edgetv)
253 {
254 }
255