2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
24 #include <gstmedian.h>
25 #include <gst/video/video.h>
27 /* elementfactory information */
28 static GstElementDetails median_details = {
32 "Apply a median filter to an image",
34 "Wim Taymans <wim.taymans@chello.be>",
38 GST_PAD_TEMPLATE_FACTORY (median_src_factory,
45 GST_VIDEO_YUV_PAD_TEMPLATE_PROPS (
46 GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
51 GST_PAD_TEMPLATE_FACTORY (median_sink_factory,
58 GST_VIDEO_YUV_PAD_TEMPLATE_PROPS (
59 GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
65 /* Median signals and args */
78 static GType gst_median_get_type (void);
79 static void gst_median_class_init (GstMedianClass *klass);
80 static void gst_median_init (GstMedian *median);
82 static void median_5 (unsigned char *src, unsigned char *dest, int height, int width);
83 static void median_9 (unsigned char *src, unsigned char *dest, int height, int width);
84 static void gst_median_chain (GstPad *pad, GstData *_data);
86 static void gst_median_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
87 static void gst_median_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
89 static GstElementClass *parent_class = NULL;
90 /*static guint gst_median_signals[LAST_SIGNAL] = { 0 }; */
93 gst_median_get_type (void)
95 static GType median_type = 0;
98 static const GTypeInfo median_info = {
99 sizeof(GstMedianClass), NULL, NULL, (GClassInitFunc)gst_median_class_init,
104 (GInstanceInitFunc)gst_median_init,
106 median_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMedian", &median_info, 0);
112 gst_median_class_init (GstMedianClass *klass)
114 GObjectClass *gobject_class;
115 GstElementClass *gstelement_class;
117 gobject_class = (GObjectClass*)klass;
118 gstelement_class = (GstElementClass*)klass;
120 parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
122 g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_ACTIVE,
123 g_param_spec_boolean("active","active","active",
124 TRUE,G_PARAM_READWRITE)); /* CHECKME */
125 g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FILTERSIZE,
126 g_param_spec_int("filtersize","filtersize","filtersize",
127 G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); /* CHECKME */
128 g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LUM_ONLY,
129 g_param_spec_boolean("lum_only","lum_only","lum_only",
130 TRUE,G_PARAM_READWRITE)); /* CHECKME */
132 gobject_class->set_property = gst_median_set_property;
133 gobject_class->get_property = gst_median_get_property;
137 gst_median_sinkconnect (GstPad *pad, GstCaps *caps)
141 filter = GST_MEDIAN (gst_pad_get_parent (pad));
143 if (!GST_CAPS_IS_FIXED (caps))
144 return GST_PAD_LINK_DELAYED;
146 gst_caps_get_int (caps, "width", &filter->width);
147 gst_caps_get_int (caps, "height", &filter->height);
149 /* forward to the next plugin */
150 return gst_pad_try_set_caps(filter->srcpad, gst_caps_copy_1(caps));
153 void gst_median_init (GstMedian *median)
155 median->sinkpad = gst_pad_new_from_template (
156 GST_PAD_TEMPLATE_GET (median_sink_factory), "sink");
157 gst_pad_set_link_function (median->sinkpad, gst_median_sinkconnect);
158 gst_pad_set_chain_function (median->sinkpad, gst_median_chain);
159 gst_element_add_pad (GST_ELEMENT (median), median->sinkpad);
161 median->srcpad = gst_pad_new_from_template (
162 GST_PAD_TEMPLATE_GET (median_src_factory), "src");
163 gst_element_add_pad (GST_ELEMENT (median), median->srcpad);
165 median->filtersize = 5;
166 median->lum_only = TRUE;
167 median->active = TRUE;
170 #define PIX_SORT(a,b) { if ((a)>(b)) PIX_SWAP((a),(b)); }
171 #define PIX_SWAP(a,b) { unsigned char temp=(a);(a)=(b);(b)=temp; }
174 median_5 (unsigned char *src, unsigned char *dest, int width, int height)
181 nLastCol = width - 1;
182 nLastRow = height - 1;
184 /*copy the top and bottom rows into the result array */
185 for (i=0; i<width; i++) {
187 dest[nLastRow * width + i] = src[nLastRow * width + i];
194 /* process the interior pixels */
196 for (k=0; k < nLastRow; k++) {
197 for (j=0; j < nLastCol; j++, i++) {
203 PIX_SORT(p[0],p[1]) ; PIX_SORT(p[3],p[4]) ; PIX_SORT(p[0],p[3]) ;
204 PIX_SORT(p[1],p[4]) ; PIX_SORT(p[1],p[2]) ; PIX_SORT(p[2],p[3]) ;
205 PIX_SORT(p[1],p[2]) ;
218 median_9 (unsigned char *src, unsigned char *dest, int width, int height)
225 nLastCol = width - 1;
226 nLastRow = height - 1;
228 /*copy the top and bottom rows into the result array */
229 for (i=0; i<width; i++) {
231 dest[nLastRow * width + i] = src[nLastRow * width + i];
238 /* process the interior pixels */
240 for (k=0; k < nLastRow; k++) {
241 for (j=0; j < nLastCol; j++, i++) {
242 p[0] = src[i-width-1];
244 p[2] = src[i-width+1];
248 p[6] = src[i+width-1];
250 p[8] = src[i+width+1];
251 PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
252 PIX_SORT(p[0], p[1]) ; PIX_SORT(p[3], p[4]) ; PIX_SORT(p[6], p[7]) ;
253 PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
254 PIX_SORT(p[0], p[3]) ; PIX_SORT(p[5], p[8]) ; PIX_SORT(p[4], p[7]) ;
255 PIX_SORT(p[3], p[6]) ; PIX_SORT(p[1], p[4]) ; PIX_SORT(p[2], p[5]) ;
256 PIX_SORT(p[4], p[7]) ; PIX_SORT(p[4], p[2]) ; PIX_SORT(p[6], p[4]) ;
257 PIX_SORT(p[4], p[2]) ;
270 gst_median_chain (GstPad *pad, GstData *_data)
272 GstBuffer *buf = GST_BUFFER (_data);
278 int lumsize, chromsize;
280 g_return_if_fail(pad != NULL);
281 g_return_if_fail(GST_IS_PAD(pad));
282 g_return_if_fail(buf != NULL);
284 median = GST_MEDIAN (GST_OBJECT_PARENT (pad));
286 if (!median->active) {
287 gst_pad_push(median->srcpad,GST_DATA (buf));
291 data = GST_BUFFER_DATA(buf);
292 size = GST_BUFFER_SIZE(buf);
294 GST_DEBUG ("median: have buffer of %d", GST_BUFFER_SIZE(buf));
296 outbuf = gst_buffer_new();
297 GST_BUFFER_DATA(outbuf) = g_malloc(GST_BUFFER_SIZE(buf));
298 GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf);
300 lumsize = median->width * median->height;
301 chromsize = lumsize/4;
303 if (median->filtersize == 5) {
304 median_5(data, GST_BUFFER_DATA(outbuf), median->width, median->height);
305 if (!median->lum_only) {
306 median_5(data+lumsize, GST_BUFFER_DATA(outbuf)+lumsize, median->width/2, median->height/2);
307 median_5(data+lumsize+chromsize, GST_BUFFER_DATA(outbuf)+lumsize+chromsize, median->width/2, median->height/2);
310 memcpy (GST_BUFFER_DATA (outbuf)+lumsize, data+lumsize, chromsize*2);
314 median_9(data, GST_BUFFER_DATA(outbuf), median->width, median->height);
315 if (!median->lum_only) {
316 median_9(data+lumsize, GST_BUFFER_DATA(outbuf)+lumsize, median->width/2, median->height/2);
317 median_9(data+lumsize+chromsize, GST_BUFFER_DATA(outbuf)+lumsize+chromsize, median->width/2, median->height/2);
320 memcpy (GST_BUFFER_DATA (outbuf)+lumsize, data+lumsize, chromsize*2);
323 GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
325 gst_buffer_unref(buf);
327 gst_pad_push(median->srcpad,GST_DATA (outbuf));
331 gst_median_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
336 /* it's not null if we got it, but it might not be ours */
337 g_return_if_fail(GST_IS_MEDIAN(object));
338 median = GST_MEDIAN(object);
342 argvalue = g_value_get_int (value);
343 if (argvalue != 5 && argvalue != 9) {
344 g_warning ("median: invalid filtersize (%d), must be 5 or 9\n", argvalue);
347 median->filtersize = argvalue;
351 median->active = g_value_get_boolean (value);
354 median->lum_only = g_value_get_boolean (value);
362 gst_median_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
366 /* it's not null if we got it, but it might not be ours */
367 g_return_if_fail(GST_IS_MEDIAN(object));
368 median = GST_MEDIAN(object);
372 g_value_set_int (value, median->filtersize);
375 g_value_set_boolean (value, median->active);
378 g_value_set_boolean (value, median->lum_only);
381 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
388 plugin_init (GModule *module, GstPlugin *plugin)
390 GstElementFactory *factory;
392 factory = gst_element_factory_new("median",GST_TYPE_MEDIAN,
394 g_return_val_if_fail(factory != NULL, FALSE);
396 gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (median_sink_factory));
397 gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (median_src_factory));
399 gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
404 GstPluginDesc plugin_desc = {