1 /* GStreamer
2 * Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
3 *
4 * EffecTV - Realtime Digital Video Effector
5 * Copyright (C) 2001-2006 FUKUCHI Kentaro
6 *
7 * StreakTV - afterimage effector.
8 * Copyright (C) 2001-2002 FUKUCHI Kentaro
9 *
10 * This combines the StreakTV and BaltanTV effects, which are
11 * very similar. BaltanTV is used if the feedback property is set
12 * to TRUE, otherwise StreakTV is used.
13 *
14 * EffecTV is free software. This library is free software;
15 * you can redistribute it and/or
16 * modify it under the terms of the GNU Library General Public
17 * License as published by the Free Software Foundation; either
18 * version 2 of the License, or (at your option) any later version.
19 *
20 * This library is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 * Library General Public License for more details.
24 *
25 * You should have received a copy of the GNU Library General Public
26 * License along with this library; if not, write to the
27 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
28 * Boston, MA 02110-1301, USA.
29 */
30
31 /**
32 * SECTION:element-streaktv
33 *
34 * StreakTV makes after images of moving objects.
35 *
36 * <refsect2>
37 * <title>Example launch line</title>
38 * |[
39 * gst-launch-1.0 -v videotestsrc ! streaktv ! videoconvert ! autovideosink
40 * ]| This pipeline shows the effect of streaktv on a test stream.
41 * </refsect2>
42 */
43
44 #ifdef HAVE_CONFIG_H
45 #include "config.h"
46 #endif
47
48 #include <math.h>
49 #include <string.h>
50
51 #include "gststreak.h"
52 #include "gsteffectv.h"
53
54 #define DEFAULT_FEEDBACK FALSE
55
56 enum
57 {
58 PROP_0,
59 PROP_FEEDBACK
60 };
61
62 #define gst_streaktv_parent_class parent_class
63 G_DEFINE_TYPE (GstStreakTV, gst_streaktv, GST_TYPE_VIDEO_FILTER);
64
65 static GstStaticPadTemplate gst_streaktv_src_template =
66 GST_STATIC_PAD_TEMPLATE ("src",
67 GST_PAD_SRC,
68 GST_PAD_ALWAYS,
69 GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ BGRx, RGBx, xBGR, xRGB }"))
70 );
71
72 static GstStaticPadTemplate gst_streaktv_sink_template =
73 GST_STATIC_PAD_TEMPLATE ("sink",
74 GST_PAD_SINK,
75 GST_PAD_ALWAYS,
76 GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ BGRx, RGBx, xBGR, xRGB }"))
77 );
78
79
80 static GstFlowReturn
gst_streaktv_transform_frame(GstVideoFilter * vfilter,GstVideoFrame * in_frame,GstVideoFrame * out_frame)81 gst_streaktv_transform_frame (GstVideoFilter * vfilter,
82 GstVideoFrame * in_frame, GstVideoFrame * out_frame)
83 {
84 GstStreakTV *filter = GST_STREAKTV (vfilter);
85 guint32 *src, *dest;
86 gint i, cf;
87 gint video_area, width, height;
88 guint32 **planetable = filter->planetable;
89 gint plane = filter->plane;
90 guint stride_mask, stride_shift, stride;
91
92 src = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
93 dest = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);
94
95 width = GST_VIDEO_FRAME_WIDTH (in_frame);
96 height = GST_VIDEO_FRAME_HEIGHT (in_frame);
97
98 video_area = width * height;
99
100 GST_OBJECT_LOCK (filter);
101 if (filter->feedback) {
102 stride_mask = 0xfcfcfcfc;
103 stride = 8;
104 stride_shift = 2;
105 } else {
106 stride_mask = 0xf8f8f8f8;
107 stride = 4;
108 stride_shift = 3;
109 }
110
111 for (i = 0; i < video_area; i++) {
112 planetable[plane][i] = (src[i] & stride_mask) >> stride_shift;
113 }
114
115 cf = plane & (stride - 1);
116 if (filter->feedback) {
117 for (i = 0; i < video_area; i++) {
118 dest[i] = planetable[cf][i]
119 + planetable[cf + stride][i]
120 + planetable[cf + stride * 2][i]
121 + planetable[cf + stride * 3][i];
122 planetable[plane][i] = (dest[i] & stride_mask) >> stride_shift;
123 }
124 } else {
125 for (i = 0; i < video_area; i++) {
126 dest[i] = planetable[cf][i]
127 + planetable[cf + stride][i]
128 + planetable[cf + stride * 2][i]
129 + planetable[cf + stride * 3][i]
130 + planetable[cf + stride * 4][i]
131 + planetable[cf + stride * 5][i]
132 + planetable[cf + stride * 6][i]
133 + planetable[cf + stride * 7][i];
134 }
135 }
136
137 plane++;
138 filter->plane = plane & (PLANES - 1);
139 GST_OBJECT_UNLOCK (filter);
140
141 return GST_FLOW_OK;
142 }
143
144 static gboolean
gst_streaktv_set_info(GstVideoFilter * vfilter,GstCaps * incaps,GstVideoInfo * in_info,GstCaps * outcaps,GstVideoInfo * out_info)145 gst_streaktv_set_info (GstVideoFilter * vfilter, GstCaps * incaps,
146 GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
147 {
148 GstStreakTV *filter = GST_STREAKTV (vfilter);
149 gint i, width, height;
150
151 width = GST_VIDEO_INFO_WIDTH (in_info);
152 height = GST_VIDEO_INFO_HEIGHT (in_info);
153
154 g_free (filter->planebuffer);
155
156 filter->planebuffer = g_new0 (guint32, width * height * 4 * PLANES);
157
158 for (i = 0; i < PLANES; i++)
159 filter->planetable[i] = &filter->planebuffer[width * height * i];
160
161 return TRUE;
162 }
163
164 static gboolean
gst_streaktv_start(GstBaseTransform * trans)165 gst_streaktv_start (GstBaseTransform * trans)
166 {
167 GstStreakTV *filter = GST_STREAKTV (trans);
168
169 filter->plane = 0;
170
171 return TRUE;
172 }
173
174 static void
gst_streaktv_finalize(GObject * object)175 gst_streaktv_finalize (GObject * object)
176 {
177 GstStreakTV *filter = GST_STREAKTV (object);
178
179 if (filter->planebuffer) {
180 g_free (filter->planebuffer);
181 filter->planebuffer = NULL;
182 }
183
184 G_OBJECT_CLASS (parent_class)->finalize (object);
185 }
186
187 static void
gst_streaktv_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)188 gst_streaktv_set_property (GObject * object, guint prop_id,
189 const GValue * value, GParamSpec * pspec)
190 {
191 GstStreakTV *filter = GST_STREAKTV (object);
192
193 switch (prop_id) {
194 case PROP_FEEDBACK:
195 if (G_UNLIKELY (GST_STATE (filter) >= GST_STATE_PAUSED)) {
196 g_warning ("Changing the \"feedback\" property only allowed "
197 "in state < PLAYING");
198 return;
199 }
200
201 filter->feedback = g_value_get_boolean (value);
202 break;
203 default:
204 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
205 break;
206 }
207 }
208
209 static void
gst_streaktv_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)210 gst_streaktv_get_property (GObject * object, guint prop_id, GValue * value,
211 GParamSpec * pspec)
212 {
213 GstStreakTV *filter = GST_STREAKTV (object);
214
215 switch (prop_id) {
216 case PROP_FEEDBACK:
217 g_value_set_boolean (value, filter->feedback);
218 break;
219 default:
220 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
221 break;
222 }
223 }
224
225 static void
gst_streaktv_class_init(GstStreakTVClass * klass)226 gst_streaktv_class_init (GstStreakTVClass * 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->set_property = gst_streaktv_set_property;
234 gobject_class->get_property = gst_streaktv_get_property;
235
236 gobject_class->finalize = gst_streaktv_finalize;
237
238 g_object_class_install_property (gobject_class, PROP_FEEDBACK,
239 g_param_spec_boolean ("feedback", "Feedback",
240 "Feedback", DEFAULT_FEEDBACK,
241 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
242
243 gst_element_class_set_static_metadata (gstelement_class, "StreakTV effect",
244 "Filter/Effect/Video",
245 "StreakTV makes after images of moving objects",
246 "FUKUCHI, Kentarou <fukuchi@users.sourceforge.net>, "
247 "Sebastian Dröge <sebastian.droege@collabora.co.uk>");
248
249 gst_element_class_add_static_pad_template (gstelement_class,
250 &gst_streaktv_sink_template);
251 gst_element_class_add_static_pad_template (gstelement_class,
252 &gst_streaktv_src_template);
253
254 trans_class->start = GST_DEBUG_FUNCPTR (gst_streaktv_start);
255
256 vfilter_class->set_info = GST_DEBUG_FUNCPTR (gst_streaktv_set_info);
257 vfilter_class->transform_frame =
258 GST_DEBUG_FUNCPTR (gst_streaktv_transform_frame);
259 }
260
261 static void
gst_streaktv_init(GstStreakTV * filter)262 gst_streaktv_init (GstStreakTV * filter)
263 {
264 filter->feedback = DEFAULT_FEEDBACK;
265 }
266