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 = {
30 "Filter/Effect/Video",
31 "Apply a median filter to an image",
32 "Wim Taymans <wim.taymans@chello.be>"
35 GST_PAD_TEMPLATE_FACTORY (median_src_factory,
42 GST_VIDEO_YUV_PAD_TEMPLATE_PROPS (
43 GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
48 GST_PAD_TEMPLATE_FACTORY (median_sink_factory,
55 GST_VIDEO_YUV_PAD_TEMPLATE_PROPS (
56 GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
62 /* Median signals and args */
75 static GType gst_median_get_type (void);
76 static void gst_median_class_init (GstMedianClass *klass);
77 static void gst_median_base_init (GstMedianClass *klass);
78 static void gst_median_init (GstMedian *median);
80 static void median_5 (unsigned char *src, unsigned char *dest, int height, int width);
81 static void median_9 (unsigned char *src, unsigned char *dest, int height, int width);
82 static void gst_median_chain (GstPad *pad, GstData *_data);
84 static void gst_median_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
85 static void gst_median_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
87 static GstElementClass *parent_class = NULL;
88 /*static guint gst_median_signals[LAST_SIGNAL] = { 0 }; */
91 gst_median_get_type (void)
93 static GType median_type = 0;
96 static const GTypeInfo median_info = {
97 sizeof(GstMedianClass),
98 (GBaseInitFunc)gst_median_base_init,
100 (GClassInitFunc)gst_median_class_init,
105 (GInstanceInitFunc)gst_median_init,
107 median_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMedian", &median_info, 0);
113 gst_median_base_init (GstMedianClass *klass)
115 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
117 gst_element_class_add_pad_template (element_class,
118 GST_PAD_TEMPLATE_GET (median_sink_factory));
119 gst_element_class_add_pad_template (element_class,
120 GST_PAD_TEMPLATE_GET (median_src_factory));
121 gst_element_class_set_details (element_class, &median_details);
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_sinkconnect (GstPad *pad, GstCaps *caps)
154 filter = GST_MEDIAN (gst_pad_get_parent (pad));
156 if (!GST_CAPS_IS_FIXED (caps))
157 return GST_PAD_LINK_DELAYED;
159 gst_caps_get_int (caps, "width", &filter->width);
160 gst_caps_get_int (caps, "height", &filter->height);
162 /* forward to the next plugin */
163 return gst_pad_try_set_caps(filter->srcpad, gst_caps_copy_1(caps));
166 void gst_median_init (GstMedian *median)
168 median->sinkpad = gst_pad_new_from_template (
169 GST_PAD_TEMPLATE_GET (median_sink_factory), "sink");
170 gst_pad_set_link_function (median->sinkpad, gst_median_sinkconnect);
171 gst_pad_set_chain_function (median->sinkpad, gst_median_chain);
172 gst_element_add_pad (GST_ELEMENT (median), median->sinkpad);
174 median->srcpad = gst_pad_new_from_template (
175 GST_PAD_TEMPLATE_GET (median_src_factory), "src");
176 gst_element_add_pad (GST_ELEMENT (median), median->srcpad);
178 median->filtersize = 5;
179 median->lum_only = TRUE;
180 median->active = TRUE;
183 #define PIX_SORT(a,b) { if ((a)>(b)) PIX_SWAP((a),(b)); }
184 #define PIX_SWAP(a,b) { unsigned char temp=(a);(a)=(b);(b)=temp; }
187 median_5 (unsigned char *src, unsigned char *dest, int width, int height)
194 nLastCol = width - 1;
195 nLastRow = height - 1;
197 /*copy the top and bottom rows into the result array */
198 for (i=0; i<width; i++) {
200 dest[nLastRow * width + i] = src[nLastRow * width + i];
207 /* process the interior pixels */
209 for (k=0; k < nLastRow; k++) {
210 for (j=0; j < nLastCol; j++, i++) {
216 PIX_SORT(p[0],p[1]) ; PIX_SORT(p[3],p[4]) ; PIX_SORT(p[0],p[3]) ;
217 PIX_SORT(p[1],p[4]) ; PIX_SORT(p[1],p[2]) ; PIX_SORT(p[2],p[3]) ;
218 PIX_SORT(p[1],p[2]) ;
231 median_9 (unsigned char *src, unsigned char *dest, int width, int height)
238 nLastCol = width - 1;
239 nLastRow = height - 1;
241 /*copy the top and bottom rows into the result array */
242 for (i=0; i<width; i++) {
244 dest[nLastRow * width + i] = src[nLastRow * width + i];
251 /* process the interior pixels */
253 for (k=0; k < nLastRow; k++) {
254 for (j=0; j < nLastCol; j++, i++) {
255 p[0] = src[i-width-1];
257 p[2] = src[i-width+1];
261 p[6] = src[i+width-1];
263 p[8] = src[i+width+1];
264 PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
265 PIX_SORT(p[0], p[1]) ; PIX_SORT(p[3], p[4]) ; PIX_SORT(p[6], p[7]) ;
266 PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
267 PIX_SORT(p[0], p[3]) ; PIX_SORT(p[5], p[8]) ; PIX_SORT(p[4], p[7]) ;
268 PIX_SORT(p[3], p[6]) ; PIX_SORT(p[1], p[4]) ; PIX_SORT(p[2], p[5]) ;
269 PIX_SORT(p[4], p[7]) ; PIX_SORT(p[4], p[2]) ; PIX_SORT(p[6], p[4]) ;
270 PIX_SORT(p[4], p[2]) ;
283 gst_median_chain (GstPad *pad, GstData *_data)
285 GstBuffer *buf = GST_BUFFER (_data);
291 int lumsize, chromsize;
293 g_return_if_fail(pad != NULL);
294 g_return_if_fail(GST_IS_PAD(pad));
295 g_return_if_fail(buf != NULL);
297 median = GST_MEDIAN (GST_OBJECT_PARENT (pad));
299 if (!median->active) {
300 gst_pad_push(median->srcpad,GST_DATA (buf));
304 data = GST_BUFFER_DATA(buf);
305 size = GST_BUFFER_SIZE(buf);
307 GST_DEBUG ("median: have buffer of %d", GST_BUFFER_SIZE(buf));
309 outbuf = gst_buffer_new();
310 GST_BUFFER_DATA(outbuf) = g_malloc(GST_BUFFER_SIZE(buf));
311 GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf);
313 lumsize = median->width * median->height;
314 chromsize = lumsize/4;
316 if (median->filtersize == 5) {
317 median_5(data, GST_BUFFER_DATA(outbuf), median->width, median->height);
318 if (!median->lum_only) {
319 median_5(data+lumsize, GST_BUFFER_DATA(outbuf)+lumsize, median->width/2, median->height/2);
320 median_5(data+lumsize+chromsize, GST_BUFFER_DATA(outbuf)+lumsize+chromsize, median->width/2, median->height/2);
323 memcpy (GST_BUFFER_DATA (outbuf)+lumsize, data+lumsize, chromsize*2);
327 median_9(data, GST_BUFFER_DATA(outbuf), median->width, median->height);
328 if (!median->lum_only) {
329 median_9(data+lumsize, GST_BUFFER_DATA(outbuf)+lumsize, median->width/2, median->height/2);
330 median_9(data+lumsize+chromsize, GST_BUFFER_DATA(outbuf)+lumsize+chromsize, median->width/2, median->height/2);
333 memcpy (GST_BUFFER_DATA (outbuf)+lumsize, data+lumsize, chromsize*2);
336 GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
338 gst_buffer_unref(buf);
340 gst_pad_push(median->srcpad,GST_DATA (outbuf));
344 gst_median_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
349 /* it's not null if we got it, but it might not be ours */
350 g_return_if_fail(GST_IS_MEDIAN(object));
351 median = GST_MEDIAN(object);
355 argvalue = g_value_get_int (value);
356 if (argvalue != 5 && argvalue != 9) {
357 g_warning ("median: invalid filtersize (%d), must be 5 or 9\n", argvalue);
360 median->filtersize = argvalue;
364 median->active = g_value_get_boolean (value);
367 median->lum_only = g_value_get_boolean (value);
375 gst_median_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
379 /* it's not null if we got it, but it might not be ours */
380 g_return_if_fail(GST_IS_MEDIAN(object));
381 median = GST_MEDIAN(object);
385 g_value_set_int (value, median->filtersize);
388 g_value_set_boolean (value, median->active);
391 g_value_set_boolean (value, median->lum_only);
394 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
401 plugin_init (GstPlugin *plugin)
403 return gst_element_register (plugin, "median",
404 GST_RANK_NONE, GST_TYPE_MEDIAN);
411 "Video median filter",