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.
21 #include <gstmedian.h>
24 static GstElementDetails median_details = {
27 "apply a median filter to an image",
29 "Wim Taymans <wim.taymans@chello.be>",
33 GST_PADTEMPLATE_FACTORY (median_src_factory,
40 "format", GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
44 GST_PADTEMPLATE_FACTORY (median_sink_factory,
51 "format", GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
56 /* Median signals and args */
69 static GType gst_median_get_type (void);
70 static void gst_median_class_init (GstMedianClass *klass);
71 static void gst_median_init (GstMedian *median);
73 static void median_5 (unsigned char *src, unsigned char *dest, int height, int width);
74 static void median_9 (unsigned char *src, unsigned char *dest, int height, int width);
75 static void gst_median_chain (GstPad *pad, GstBuffer *buf);
77 static void gst_median_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
78 static void gst_median_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
80 static GstElementClass *parent_class = NULL;
81 //static guint gst_median_signals[LAST_SIGNAL] = { 0 };
83 static GstPadNegotiateReturn
84 median_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data)
86 GstMedian* filter = GST_MEDIAN (gst_pad_get_parent (pad));
89 return GST_PAD_NEGOTIATE_FAIL;
91 return gst_pad_negotiate_proxy (pad, filter->sinkpad, caps);
94 static GstPadNegotiateReturn
95 median_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data)
97 GstMedian* filter = GST_MEDIAN (gst_pad_get_parent (pad));
100 return GST_PAD_NEGOTIATE_FAIL;
102 return gst_pad_negotiate_proxy (pad, filter->srcpad, caps);
106 gst_median_get_type (void)
108 static GType median_type = 0;
111 static const GTypeInfo median_info = {
112 sizeof(GstMedianClass), NULL, NULL, (GClassInitFunc)gst_median_class_init,
117 (GInstanceInitFunc)gst_median_init,
119 median_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMedian", &median_info, 0);
125 gst_median_class_init (GstMedianClass *klass)
127 GObjectClass *gobject_class;
128 GstElementClass *gstelement_class;
130 gobject_class = (GObjectClass*)klass;
131 gstelement_class = (GstElementClass*)klass;
133 parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
135 g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_ACTIVE,
136 g_param_spec_boolean("active","active","active",
137 TRUE,G_PARAM_READWRITE)); // CHECKME
138 g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FILTERSIZE,
139 g_param_spec_int("filtersize","filtersize","filtersize",
140 G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); // CHECKME
141 g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LUM_ONLY,
142 g_param_spec_boolean("lum_only","lum_only","lum_only",
143 TRUE,G_PARAM_READWRITE)); // CHECKME
145 gobject_class->set_property = gst_median_set_property;
146 gobject_class->get_property = gst_median_get_property;
150 gst_median_newcaps (GstPad *pad, GstCaps *caps)
154 filter = GST_MEDIAN (gst_pad_get_parent (pad));
156 filter->width = gst_caps_get_int (caps, "width");
157 filter->height = gst_caps_get_int (caps, "height");
160 void gst_median_init (GstMedian *median)
162 median->sinkpad = gst_pad_new_from_template (
163 GST_PADTEMPLATE_GET (median_sink_factory), "sink");
164 gst_pad_set_negotiate_function (median->sinkpad, median_negotiate_sink);
165 gst_pad_set_newcaps_function (median->sinkpad, gst_median_newcaps);
166 gst_pad_set_chain_function (median->sinkpad, gst_median_chain);
167 gst_element_add_pad (GST_ELEMENT (median), median->sinkpad);
169 median->srcpad = gst_pad_new_from_template (
170 GST_PADTEMPLATE_GET (median_src_factory), "src");
171 gst_pad_set_negotiate_function (median->srcpad, median_negotiate_src);
172 gst_element_add_pad (GST_ELEMENT (median), median->srcpad);
174 median->filtersize = 5;
175 median->lum_only = TRUE;
176 median->active = TRUE;
179 #define PIX_SORT(a,b) { if ((a)>(b)) PIX_SWAP((a),(b)); }
180 #define PIX_SWAP(a,b) { unsigned char temp=(a);(a)=(b);(b)=temp; }
183 median_5 (unsigned char *src, unsigned char *dest, int width, int height)
190 nLastCol = width - 1;
191 nLastRow = height - 1;
193 //copy the top and bottom rows into the result array
194 for (i=0; i<width; i++) {
196 dest[nLastRow * width + i] = src[nLastRow * width + i];
203 /* process the interior pixels */
205 for (k=0; k < nLastRow; k++) {
206 for (j=0; j < nLastCol; j++, i++) {
212 PIX_SORT(p[0],p[1]) ; PIX_SORT(p[3],p[4]) ; PIX_SORT(p[0],p[3]) ;
213 PIX_SORT(p[1],p[4]) ; PIX_SORT(p[1],p[2]) ; PIX_SORT(p[2],p[3]) ;
214 PIX_SORT(p[1],p[2]) ;
224 median_9 (unsigned char *src, unsigned char *dest, int width, int height)
231 nLastCol = width - 1;
232 nLastRow = height - 1;
234 //copy the top and bottom rows into the result array
235 for (i=0; i<width; i++) {
237 dest[nLastRow * width + i] = src[nLastRow * width + i];
244 /* process the interior pixels */
246 for (k=0; k < nLastRow; k++) {
247 for (j=0; j < nLastCol; j++, i++) {
248 p[0] = src[i-width-1];
250 p[2] = src[i-width+1];
254 p[6] = src[i+width-1];
256 p[8] = src[i+width+1];
257 PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
258 PIX_SORT(p[0], p[1]) ; PIX_SORT(p[3], p[4]) ; PIX_SORT(p[6], p[7]) ;
259 PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
260 PIX_SORT(p[0], p[3]) ; PIX_SORT(p[5], p[8]) ; PIX_SORT(p[4], p[7]) ;
261 PIX_SORT(p[3], p[6]) ; PIX_SORT(p[1], p[4]) ; PIX_SORT(p[2], p[5]) ;
262 PIX_SORT(p[4], p[7]) ; PIX_SORT(p[4], p[2]) ; PIX_SORT(p[6], p[4]) ;
263 PIX_SORT(p[4], p[2]) ;
273 gst_median_chain (GstPad *pad, GstBuffer *buf)
280 int lumsize, chromsize;
282 g_return_if_fail(pad != NULL);
283 g_return_if_fail(GST_IS_PAD(pad));
284 g_return_if_fail(buf != NULL);
286 median = GST_MEDIAN (GST_OBJECT_PARENT (pad));
288 if (!median->active) {
289 gst_pad_push(median->srcpad,buf);
293 data = GST_BUFFER_DATA(buf);
294 size = GST_BUFFER_SIZE(buf);
296 GST_DEBUG (0,"median: have buffer of %d\n", GST_BUFFER_SIZE(buf));
298 outbuf = gst_buffer_new();
299 GST_BUFFER_DATA(outbuf) = g_malloc(GST_BUFFER_SIZE(buf));
300 GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf);
302 lumsize = median->width * median->height;
303 chromsize = lumsize/4;
305 if (median->filtersize == 5) {
306 median_5(data, GST_BUFFER_DATA(outbuf), median->width, median->height);
307 if (!median->lum_only) {
308 median_5(data+lumsize, GST_BUFFER_DATA(outbuf)+lumsize, median->width/2, median->height/2);
309 median_5(data+lumsize+chromsize, GST_BUFFER_DATA(outbuf)+lumsize+chromsize, median->width/2, median->height/2);
312 memcpy (GST_BUFFER_DATA (outbuf)+lumsize, data+lumsize, chromsize*2);
316 median_9(data, GST_BUFFER_DATA(outbuf), median->width, median->height);
317 if (!median->lum_only) {
318 median_9(data+lumsize, GST_BUFFER_DATA(outbuf)+lumsize, median->width/2, median->height/2);
319 median_9(data+lumsize+chromsize, GST_BUFFER_DATA(outbuf)+lumsize+chromsize, median->width/2, median->height/2);
322 memcpy (GST_BUFFER_DATA (outbuf)+lumsize, data+lumsize, chromsize*2);
325 GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
327 gst_buffer_unref(buf);
329 gst_pad_push(median->srcpad,outbuf);
333 gst_median_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
338 /* it's not null if we got it, but it might not be ours */
339 g_return_if_fail(GST_IS_MEDIAN(object));
340 median = GST_MEDIAN(object);
344 argvalue = g_value_get_int (value);
345 if (argvalue != 5 && argvalue != 9) {
346 g_warning ("median: invalid filtersize (%d), must be 5 or 9\n", argvalue);
349 median->filtersize = argvalue;
353 median->active = g_value_get_boolean (value);
356 median->lum_only = g_value_get_boolean (value);
364 gst_median_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
368 /* it's not null if we got it, but it might not be ours */
369 g_return_if_fail(GST_IS_MEDIAN(object));
370 median = GST_MEDIAN(object);
374 g_value_set_int (value, median->filtersize);
377 g_value_set_boolean (value, median->active);
380 g_value_set_boolean (value, median->lum_only);
383 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
390 plugin_init (GModule *module, GstPlugin *plugin)
392 GstElementFactory *factory;
394 factory = gst_elementfactory_new("median",GST_TYPE_MEDIAN,
396 g_return_val_if_fail(factory != NULL, FALSE);
398 gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (median_sink_factory));
399 gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (median_src_factory));
401 gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
406 GstPluginDesc plugin_desc = {