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394 lines
11 KiB
C
394 lines
11 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <string.h>
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#include <gstmedian.h>
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static GstElementDetails median_details = {
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"Median effect",
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"Filter/Effect",
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"apply a median filter to an image",
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VERSION,
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"Wim Taymans <wim.taymans@chello.be>",
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"(C) 2000",
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};
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GST_PADTEMPLATE_FACTORY (median_src_factory,
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"src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW (
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"median_src",
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"video/raw",
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"format", GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
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)
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)
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GST_PADTEMPLATE_FACTORY (median_sink_factory,
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"sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_CAPS_NEW (
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"median_src",
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"video/raw",
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"format", GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
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)
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)
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/* Median signals and args */
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enum {
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/* FILL ME */
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LAST_SIGNAL
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};
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enum {
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ARG_0,
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ARG_ACTIVE,
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ARG_FILTERSIZE,
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ARG_LUM_ONLY
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};
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static GType gst_median_get_type (void);
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static void gst_median_class_init (GstMedianClass *klass);
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static void gst_median_init (GstMedian *median);
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static void median_5 (unsigned char *src, unsigned char *dest, int height, int width);
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static void median_9 (unsigned char *src, unsigned char *dest, int height, int width);
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static void gst_median_chain (GstPad *pad, GstBuffer *buf);
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static void gst_median_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
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static void gst_median_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
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static GstElementClass *parent_class = NULL;
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/*static guint gst_median_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_median_get_type (void)
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{
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static GType median_type = 0;
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if (!median_type) {
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static const GTypeInfo median_info = {
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sizeof(GstMedianClass), NULL, NULL, (GClassInitFunc)gst_median_class_init,
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NULL,
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NULL,
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sizeof(GstMedian),
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0,
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(GInstanceInitFunc)gst_median_init,
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};
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median_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMedian", &median_info, 0);
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}
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return median_type;
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}
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static void
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gst_median_class_init (GstMedianClass *klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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gobject_class = (GObjectClass*)klass;
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gstelement_class = (GstElementClass*)klass;
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parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_ACTIVE,
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g_param_spec_boolean("active","active","active",
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TRUE,G_PARAM_READWRITE)); /* CHECKME */
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FILTERSIZE,
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g_param_spec_int("filtersize","filtersize","filtersize",
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G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); /* CHECKME */
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LUM_ONLY,
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g_param_spec_boolean("lum_only","lum_only","lum_only",
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TRUE,G_PARAM_READWRITE)); /* CHECKME */
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gobject_class->set_property = gst_median_set_property;
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gobject_class->get_property = gst_median_get_property;
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}
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static gboolean
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gst_median_sinkconnect (GstPad *pad, GstCaps *caps)
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{
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GstMedian *filter;
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filter = GST_MEDIAN (gst_pad_get_parent (pad));
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if (!GST_CAPS_IS_FIXED (caps))
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return GST_PAD_CONNECT_DELAYED;
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filter->width = gst_caps_get_int (caps, "width");
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filter->height = gst_caps_get_int (caps, "height");
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return GST_PAD_CONNECT_OK;
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}
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void gst_median_init (GstMedian *median)
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{
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median->sinkpad = gst_pad_new_from_template (
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GST_PADTEMPLATE_GET (median_sink_factory), "sink");
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gst_pad_set_connect_function (median->sinkpad, gst_median_sinkconnect);
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gst_pad_set_chain_function (median->sinkpad, gst_median_chain);
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gst_element_add_pad (GST_ELEMENT (median), median->sinkpad);
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median->srcpad = gst_pad_new_from_template (
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GST_PADTEMPLATE_GET (median_src_factory), "src");
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gst_element_add_pad (GST_ELEMENT (median), median->srcpad);
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median->filtersize = 5;
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median->lum_only = TRUE;
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median->active = TRUE;
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}
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#define PIX_SORT(a,b) { if ((a)>(b)) PIX_SWAP((a),(b)); }
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#define PIX_SWAP(a,b) { unsigned char temp=(a);(a)=(b);(b)=temp; }
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static void
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median_5 (unsigned char *src, unsigned char *dest, int width, int height)
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{
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int nLastRow;
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int nLastCol;
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unsigned char p[9];
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int i, j, k;
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nLastCol = width - 1;
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nLastRow = height - 1;
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/*copy the top and bottom rows into the result array */
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for (i=0; i<width; i++) {
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dest[i] = src[i];
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dest[nLastRow * width + i] = src[nLastRow * width + i];
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}
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dest[i] = src[i];
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nLastCol--;
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nLastRow--;
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/* process the interior pixels */
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i = width + 1;
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for (k=0; k < nLastRow; k++) {
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for (j=0; j < nLastCol; j++, i++) {
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p[0] = src[i-width];
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p[1] = src[i-1];
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p[2] = src[i];
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p[3] = src[i+1];
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p[4] = src[i+width];
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PIX_SORT(p[0],p[1]) ; PIX_SORT(p[3],p[4]) ; PIX_SORT(p[0],p[3]) ;
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PIX_SORT(p[1],p[4]) ; PIX_SORT(p[1],p[2]) ; PIX_SORT(p[2],p[3]) ;
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PIX_SORT(p[1],p[2]) ;
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dest[i] = p[2];
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}
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dest[i] = src[i++];
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dest[i] = src[i++];
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}
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dest[i] = src[i++];
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}
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static void
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median_9 (unsigned char *src, unsigned char *dest, int width, int height)
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{
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int nLastRow;
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int nLastCol;
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unsigned char p[9];
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int i, j, k;
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nLastCol = width - 1;
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nLastRow = height - 1;
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/*copy the top and bottom rows into the result array */
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for (i=0; i<width; i++) {
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dest[i] = src[i];
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dest[nLastRow * width + i] = src[nLastRow * width + i];
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}
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dest[i] = src[i];
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nLastCol--;
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nLastRow--;
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/* process the interior pixels */
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i = width + 1;
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for (k=0; k < nLastRow; k++) {
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for (j=0; j < nLastCol; j++, i++) {
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p[0] = src[i-width-1];
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p[1] = src[i-width];
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p[2] = src[i-width+1];
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p[3] = src[i-1];
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p[4] = src[i];
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p[5] = src[i+1];
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p[6] = src[i+width-1];
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p[7] = src[i+width];
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p[8] = src[i+width+1];
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PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
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PIX_SORT(p[0], p[1]) ; PIX_SORT(p[3], p[4]) ; PIX_SORT(p[6], p[7]) ;
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PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
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PIX_SORT(p[0], p[3]) ; PIX_SORT(p[5], p[8]) ; PIX_SORT(p[4], p[7]) ;
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PIX_SORT(p[3], p[6]) ; PIX_SORT(p[1], p[4]) ; PIX_SORT(p[2], p[5]) ;
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PIX_SORT(p[4], p[7]) ; PIX_SORT(p[4], p[2]) ; PIX_SORT(p[6], p[4]) ;
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PIX_SORT(p[4], p[2]) ;
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dest[i] = p[4];
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}
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dest[i] = src[i++];
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dest[i] = src[i++];
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}
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dest[i] = src[i++];
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}
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static void
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gst_median_chain (GstPad *pad, GstBuffer *buf)
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{
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GstMedian *median;
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guchar *data;
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gulong size;
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GstBuffer *outbuf;
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/* GstMeta *meta; */
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int lumsize, chromsize;
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g_return_if_fail(pad != NULL);
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g_return_if_fail(GST_IS_PAD(pad));
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g_return_if_fail(buf != NULL);
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median = GST_MEDIAN (GST_OBJECT_PARENT (pad));
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if (!median->active) {
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gst_pad_push(median->srcpad,buf);
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return;
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}
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data = GST_BUFFER_DATA(buf);
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size = GST_BUFFER_SIZE(buf);
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GST_DEBUG (0,"median: have buffer of %d\n", GST_BUFFER_SIZE(buf));
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outbuf = gst_buffer_new();
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GST_BUFFER_DATA(outbuf) = g_malloc(GST_BUFFER_SIZE(buf));
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GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf);
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lumsize = median->width * median->height;
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chromsize = lumsize/4;
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if (median->filtersize == 5) {
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median_5(data, GST_BUFFER_DATA(outbuf), median->width, median->height);
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if (!median->lum_only) {
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median_5(data+lumsize, GST_BUFFER_DATA(outbuf)+lumsize, median->width/2, median->height/2);
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median_5(data+lumsize+chromsize, GST_BUFFER_DATA(outbuf)+lumsize+chromsize, median->width/2, median->height/2);
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}
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else {
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memcpy (GST_BUFFER_DATA (outbuf)+lumsize, data+lumsize, chromsize*2);
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}
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}
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else {
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median_9(data, GST_BUFFER_DATA(outbuf), median->width, median->height);
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if (!median->lum_only) {
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median_9(data+lumsize, GST_BUFFER_DATA(outbuf)+lumsize, median->width/2, median->height/2);
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median_9(data+lumsize+chromsize, GST_BUFFER_DATA(outbuf)+lumsize+chromsize, median->width/2, median->height/2);
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}
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else {
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memcpy (GST_BUFFER_DATA (outbuf)+lumsize, data+lumsize, chromsize*2);
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}
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}
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GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
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gst_buffer_unref(buf);
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gst_pad_push(median->srcpad,outbuf);
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}
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static void
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gst_median_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
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{
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GstMedian *median;
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gint argvalue;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail(GST_IS_MEDIAN(object));
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median = GST_MEDIAN(object);
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switch (prop_id) {
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case ARG_FILTERSIZE:
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argvalue = g_value_get_int (value);
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if (argvalue != 5 && argvalue != 9) {
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g_warning ("median: invalid filtersize (%d), must be 5 or 9\n", argvalue);
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}
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else {
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median->filtersize = argvalue;
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}
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break;
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case ARG_ACTIVE:
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median->active = g_value_get_boolean (value);
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break;
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case ARG_LUM_ONLY:
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median->lum_only = g_value_get_boolean (value);
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break;
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default:
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break;
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}
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}
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static void
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gst_median_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
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{
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GstMedian *median;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail(GST_IS_MEDIAN(object));
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median = GST_MEDIAN(object);
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switch (prop_id) {
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case ARG_FILTERSIZE:
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g_value_set_int (value, median->filtersize);
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break;
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case ARG_ACTIVE:
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g_value_set_boolean (value, median->active);
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break;
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case ARG_LUM_ONLY:
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g_value_set_boolean (value, median->lum_only);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static gboolean
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plugin_init (GModule *module, GstPlugin *plugin)
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{
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GstElementFactory *factory;
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factory = gst_elementfactory_new("median",GST_TYPE_MEDIAN,
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&median_details);
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g_return_val_if_fail(factory != NULL, FALSE);
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gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (median_sink_factory));
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gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (median_src_factory));
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gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
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return TRUE;
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}
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GstPluginDesc plugin_desc = {
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"median",
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plugin_init
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};
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