3 * Copyright (C) 2010 Luis de Bethencourt <luis@debethencourt.com>
5 * Chromium - burning chrome video effect.
6 * Based on Pete Warden's FreeFrame plugin with the same name.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24 * DEALINGS IN THE SOFTWARE.
26 * Alternatively, the contents of this file may be used under the
27 * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
28 * which case the following provisions apply instead of the ones
31 * This library is free software; you can redistribute it and/or
32 * modify it under the terms of the GNU Library General Public
33 * License as published by the Free Software Foundation; either
34 * version 2 of the License, or (at your option) any later version.
36 * This library is distributed in the hope that it will be useful,
37 * but WITHOUT ANY WARRANTY; without even the implied warranty of
38 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
39 * Library General Public License for more details.
41 * You should have received a copy of the GNU Library General Public
42 * License along with this library; if not, write to the
43 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
44 * Boston, MA 02111-1307, USA.
48 * SECTION:element-chromium
50 * Chromium breaks the colors of a video stream in realtime.
53 * <title>Example launch line</title>
55 * gst-launch -v videotestsrc ! chromium ! ffmpegcolorspace ! autovideosink
56 * ]| This pipeline shows the effect of chromium on a test stream
66 #include <gst/controller/gstcontroller.h>
68 #include "gstplugin.h"
69 #include "gstchromium.h"
71 #include <gst/video/video.h>
73 GST_DEBUG_CATEGORY_STATIC (gst_chromium_debug);
74 #define GST_CAT_DEFAULT gst_chromium_debug
76 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
77 #define CAPS_STR GST_VIDEO_CAPS_BGRx ";" GST_VIDEO_CAPS_RGBx
79 #define CAPS_STR GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_xBGR
82 /* Filter signals and args. */
98 #define DEFAULT_EDGE_A 200
99 #define DEFAULT_EDGE_B 1
101 const float pi = 3.141582f;
103 gint cosTablePi = 512;
104 gint cosTableTwoPi = (2 * 512);
105 gint cosTableOne = 512;
106 gint cosTableMask = 1023;
108 gint cosTable[2 * 512];
110 static gint gate_int (gint value, gint min, gint max);
111 void setup_cos_table (void);
112 static gint cos_from_table (int angle);
113 static inline int abs_int (int val);
114 static void transform (guint32 * src, guint32 * dest, gint video_area,
115 gint edge_a, gint edge_b);
117 /* The capabilities of the inputs and outputs. */
119 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
122 GST_STATIC_CAPS (CAPS_STR)
125 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
128 GST_STATIC_CAPS (CAPS_STR)
131 GST_BOILERPLATE (GstChromium, gst_chromium, GstVideoFilter,
132 GST_TYPE_VIDEO_FILTER);
134 static void gst_chromium_set_property (GObject * object, guint prop_id,
135 const GValue * value, GParamSpec * pspec);
136 static void gst_chromium_get_property (GObject * object, guint prop_id,
137 GValue * value, GParamSpec * pspec);
139 static gboolean gst_chromium_set_caps (GstBaseTransform * btrans,
140 GstCaps * incaps, GstCaps * outcaps);
141 static GstFlowReturn gst_chromium_transform (GstBaseTransform * btrans,
142 GstBuffer * in_buf, GstBuffer * out_buf);
144 /* GObject vmethod implementations */
147 gst_chromium_base_init (gpointer gclass)
149 GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
151 gst_element_class_set_details_simple (element_class,
153 "Filter/Effect/Video",
154 "Chromium breaks the colors of the video signal.",
155 "Luis de Bethencourt <luis@debethencourt.com>");
157 gst_element_class_add_static_pad_template (element_class, &src_factory);
158 gst_element_class_add_static_pad_template (element_class, &sink_factory);
161 /* Initialize the chromium's class. */
163 gst_chromium_class_init (GstChromiumClass * klass)
165 GObjectClass *gobject_class = (GObjectClass *) klass;
166 GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
168 gobject_class->set_property = gst_chromium_set_property;
169 gobject_class->get_property = gst_chromium_get_property;
171 g_object_class_install_property (gobject_class, PROP_EDGE_A,
172 g_param_spec_uint ("edge-a", "Edge A",
173 "First edge parameter", 0, 256, DEFAULT_EDGE_A,
174 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
176 g_object_class_install_property (gobject_class, PROP_EDGE_B,
177 g_param_spec_uint ("edge-b", "Edge B",
178 "Second edge parameter", 0, 256, DEFAULT_EDGE_B,
179 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
181 g_object_class_install_property (gobject_class, PROP_SILENT,
182 g_param_spec_boolean ("silent", "Silent", "Produce verbose output ?",
183 FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
185 trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_chromium_set_caps);
186 trans_class->transform = GST_DEBUG_FUNCPTR (gst_chromium_transform);
189 /* Initialize the element,
190 * instantiate pads and add them to element,
191 * set pad calback functions, and
192 * initialize instance structure.
195 gst_chromium_init (GstChromium * filter, GstChromiumClass * gclass)
197 filter->edge_a = DEFAULT_EDGE_A;
198 filter->edge_b = DEFAULT_EDGE_B;
199 filter->silent = FALSE;
205 gst_chromium_set_property (GObject * object, guint prop_id,
206 const GValue * value, GParamSpec * pspec)
208 GstChromium *filter = GST_CHROMIUM (object);
212 filter->silent = g_value_get_boolean (value);
215 filter->edge_a = g_value_get_uint (value);
218 filter->edge_b = g_value_get_uint (value);
221 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
228 gst_chromium_get_property (GObject * object, guint prop_id,
229 GValue * value, GParamSpec * pspec)
231 GstChromium *filter = GST_CHROMIUM (object);
233 GST_OBJECT_LOCK (filter);
236 g_value_set_boolean (value, filter->silent);
239 g_value_set_uint (value, filter->edge_a);
242 g_value_set_uint (value, filter->edge_b);
245 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
248 GST_OBJECT_UNLOCK (filter);
251 /* GstElement vmethod implementations */
253 /* Handle the link with other elements. */
255 gst_chromium_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
258 GstChromium *filter = GST_CHROMIUM (btrans);
259 GstStructure *structure;
260 gboolean ret = FALSE;
262 structure = gst_caps_get_structure (incaps, 0);
264 GST_OBJECT_LOCK (filter);
265 if (gst_structure_get_int (structure, "width", &filter->width) &&
266 gst_structure_get_int (structure, "height", &filter->height)) {
269 GST_OBJECT_UNLOCK (filter);
274 /* Actual processing. */
276 gst_chromium_transform (GstBaseTransform * btrans,
277 GstBuffer * in_buf, GstBuffer * out_buf)
279 GstChromium *filter = GST_CHROMIUM (btrans);
280 gint video_size, edge_a, edge_b;
281 guint32 *src = (guint32 *) GST_BUFFER_DATA (in_buf);
282 guint32 *dest = (guint32 *) GST_BUFFER_DATA (out_buf);
283 GstClockTime timestamp;
286 /* GstController: update the properties */
287 timestamp = GST_BUFFER_TIMESTAMP (in_buf);
289 gst_segment_to_stream_time (&btrans->segment, GST_FORMAT_TIME, timestamp);
291 GST_DEBUG_OBJECT (filter, "sync to %" GST_TIME_FORMAT,
292 GST_TIME_ARGS (timestamp));
294 if (GST_CLOCK_TIME_IS_VALID (stream_time))
295 gst_object_sync_values (G_OBJECT (filter), stream_time);
297 GST_OBJECT_LOCK (filter);
298 edge_a = filter->edge_a;
299 edge_b = filter->edge_b;
300 GST_OBJECT_UNLOCK (filter);
302 video_size = filter->width * filter->height;
303 transform (src, dest, video_size, edge_a, edge_b);
308 /* Entry point to initialize the plug-in.
309 * Register the element factories and other features. */
311 gst_chromium_plugin_init (GstPlugin * chromium)
313 /* debug category for fltering log messages */
314 GST_DEBUG_CATEGORY_INIT (gst_chromium_debug, "chromium", 0,
315 "Template chromium");
317 return gst_element_register (chromium, "chromium", GST_RANK_NONE,
321 /*** Now the image processing work.... ***/
322 /* Set up the cosine table. */
324 setup_cos_table (void)
328 for (angle = 0; angle < cosTableTwoPi; ++angle) {
329 float angleInRadians = ((float) (angle) / cosTablePi) * pi;
330 cosTable[angle] = (int) (cos (angleInRadians) * cosTableOne);
334 /* Keep the values absolute. */
345 /* Keep the values inbounds. */
347 gate_int (gint value, gint min, gint max)
351 } else if (value > max) {
358 /* Cosine from Table. */
360 cos_from_table (int angle)
362 angle &= cosTableMask;
363 return cosTable[angle];
366 /* Transform processes each frame. */
368 transform (guint32 * src, guint32 * dest, gint video_area,
369 gint edge_a, gint edge_b)
371 guint32 in, red, green, blue;
374 for (x = 0; x < video_area; x++) {
377 red = (in >> 16) & 0xff;
378 green = (in >> 8) & 0xff;
381 red = abs_int (cos_from_table ((red + edge_a) + ((red * edge_b) / 2)));
382 green = abs_int (cos_from_table (
383 (green + edge_a) + ((green * edge_b) / 2)));
384 blue = abs_int (cos_from_table ((blue + edge_a) + ((blue * edge_b) / 2)));
386 red = gate_int (red, 0, 255);
387 green = gate_int (green, 0, 255);
388 blue = gate_int (blue, 0, 255);
390 *dest++ = (red << 16) | (green << 8) | blue;