gstreamer/gst/median/gstmedian.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <string.h>
#include <gstmedian.h>
/* elementfactory information */
static GstElementDetails median_details = {
"Median effect",
"Filter/Video",
"LGPL",
"Apply a median filter to an image",
VERSION,
"Wim Taymans <wim.taymans@chello.be>",
"(C) 2000",
};
GST_PAD_TEMPLATE_FACTORY (median_src_factory,
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"median_src",
"video/raw",
"format", GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
)
)
GST_PAD_TEMPLATE_FACTORY (median_sink_factory,
"sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_CAPS_NEW (
"median_src",
"video/raw",
"format", GST_PROPS_FOURCC (GST_STR_FOURCC ("I420"))
)
)
/* Median signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_ACTIVE,
ARG_FILTERSIZE,
ARG_LUM_ONLY
};
static GType gst_median_get_type (void);
static void gst_median_class_init (GstMedianClass *klass);
static void gst_median_init (GstMedian *median);
static void median_5 (unsigned char *src, unsigned char *dest, int height, int width);
static void median_9 (unsigned char *src, unsigned char *dest, int height, int width);
static void gst_median_chain (GstPad *pad, GstBuffer *buf);
static void gst_median_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_median_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static GstElementClass *parent_class = NULL;
/*static guint gst_median_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_median_get_type (void)
{
static GType median_type = 0;
if (!median_type) {
static const GTypeInfo median_info = {
sizeof(GstMedianClass), NULL, NULL, (GClassInitFunc)gst_median_class_init,
NULL,
NULL,
sizeof(GstMedian),
0,
(GInstanceInitFunc)gst_median_init,
};
median_type = g_type_register_static(GST_TYPE_ELEMENT, "GstMedian", &median_info, 0);
}
return median_type;
}
static void
gst_median_class_init (GstMedianClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_ACTIVE,
g_param_spec_boolean("active","active","active",
TRUE,G_PARAM_READWRITE)); /* CHECKME */
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_FILTERSIZE,
g_param_spec_int("filtersize","filtersize","filtersize",
G_MININT,G_MAXINT,0,G_PARAM_READWRITE)); /* CHECKME */
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LUM_ONLY,
g_param_spec_boolean("lum_only","lum_only","lum_only",
TRUE,G_PARAM_READWRITE)); /* CHECKME */
gobject_class->set_property = gst_median_set_property;
gobject_class->get_property = gst_median_get_property;
}
static gboolean
gst_median_sinkconnect (GstPad *pad, GstCaps *caps)
{
GstMedian *filter;
filter = GST_MEDIAN (gst_pad_get_parent (pad));
if (!GST_CAPS_IS_FIXED (caps))
return GST_PAD_CONNECT_DELAYED;
gst_caps_get_int (caps, "width", &filter->width);
gst_caps_get_int (caps, "height", &filter->height);
/* forward to the next plugin */
return gst_pad_try_set_caps(filter->srcpad, gst_caps_copy_1(caps));
}
void gst_median_init (GstMedian *median)
{
median->sinkpad = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (median_sink_factory), "sink");
gst_pad_set_connect_function (median->sinkpad, gst_median_sinkconnect);
gst_pad_set_chain_function (median->sinkpad, gst_median_chain);
gst_element_add_pad (GST_ELEMENT (median), median->sinkpad);
median->srcpad = gst_pad_new_from_template (
GST_PAD_TEMPLATE_GET (median_src_factory), "src");
gst_element_add_pad (GST_ELEMENT (median), median->srcpad);
median->filtersize = 5;
median->lum_only = TRUE;
median->active = TRUE;
}
#define PIX_SORT(a,b) { if ((a)>(b)) PIX_SWAP((a),(b)); }
#define PIX_SWAP(a,b) { unsigned char temp=(a);(a)=(b);(b)=temp; }
static void
median_5 (unsigned char *src, unsigned char *dest, int width, int height)
{
int nLastRow;
int nLastCol;
unsigned char p[9];
int i, j, k;
nLastCol = width - 1;
nLastRow = height - 1;
/*copy the top and bottom rows into the result array */
for (i=0; i<width; i++) {
dest[i] = src[i];
dest[nLastRow * width + i] = src[nLastRow * width + i];
}
dest[i] = src[i];
nLastCol--;
nLastRow--;
/* process the interior pixels */
i = width + 1;
for (k=0; k < nLastRow; k++) {
for (j=0; j < nLastCol; j++, i++) {
p[0] = src[i-width];
p[1] = src[i-1];
p[2] = src[i];
p[3] = src[i+1];
p[4] = src[i+width];
PIX_SORT(p[0],p[1]) ; PIX_SORT(p[3],p[4]) ; PIX_SORT(p[0],p[3]) ;
PIX_SORT(p[1],p[4]) ; PIX_SORT(p[1],p[2]) ; PIX_SORT(p[2],p[3]) ;
PIX_SORT(p[1],p[2]) ;
dest[i] = p[2];
}
dest[i] = src[i];
i++;
dest[i] = src[i];
i++;
}
dest[i] = src[i];
i++;
}
static void
median_9 (unsigned char *src, unsigned char *dest, int width, int height)
{
int nLastRow;
int nLastCol;
unsigned char p[9];
int i, j, k;
nLastCol = width - 1;
nLastRow = height - 1;
/*copy the top and bottom rows into the result array */
for (i=0; i<width; i++) {
dest[i] = src[i];
dest[nLastRow * width + i] = src[nLastRow * width + i];
}
dest[i] = src[i];
nLastCol--;
nLastRow--;
/* process the interior pixels */
i = width + 1;
for (k=0; k < nLastRow; k++) {
for (j=0; j < nLastCol; j++, i++) {
p[0] = src[i-width-1];
p[1] = src[i-width];
p[2] = src[i-width+1];
p[3] = src[i-1];
p[4] = src[i];
p[5] = src[i+1];
p[6] = src[i+width-1];
p[7] = src[i+width];
p[8] = src[i+width+1];
PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
PIX_SORT(p[0], p[1]) ; PIX_SORT(p[3], p[4]) ; PIX_SORT(p[6], p[7]) ;
PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
PIX_SORT(p[0], p[3]) ; PIX_SORT(p[5], p[8]) ; PIX_SORT(p[4], p[7]) ;
PIX_SORT(p[3], p[6]) ; PIX_SORT(p[1], p[4]) ; PIX_SORT(p[2], p[5]) ;
PIX_SORT(p[4], p[7]) ; PIX_SORT(p[4], p[2]) ; PIX_SORT(p[6], p[4]) ;
PIX_SORT(p[4], p[2]) ;
dest[i] = p[4];
}
dest[i] = src[i];
i++;
dest[i] = src[i];
i++;
}
dest[i] = src[i];
i++;
}
static void
gst_median_chain (GstPad *pad, GstBuffer *buf)
{
GstMedian *median;
guchar *data;
gulong size;
GstBuffer *outbuf;
/* GstMeta *meta; */
int lumsize, chromsize;
g_return_if_fail(pad != NULL);
g_return_if_fail(GST_IS_PAD(pad));
g_return_if_fail(buf != NULL);
median = GST_MEDIAN (GST_OBJECT_PARENT (pad));
if (!median->active) {
gst_pad_push(median->srcpad,buf);
return;
}
data = GST_BUFFER_DATA(buf);
size = GST_BUFFER_SIZE(buf);
GST_DEBUG (0,"median: have buffer of %d", GST_BUFFER_SIZE(buf));
outbuf = gst_buffer_new();
GST_BUFFER_DATA(outbuf) = g_malloc(GST_BUFFER_SIZE(buf));
GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf);
lumsize = median->width * median->height;
chromsize = lumsize/4;
if (median->filtersize == 5) {
median_5(data, GST_BUFFER_DATA(outbuf), median->width, median->height);
if (!median->lum_only) {
median_5(data+lumsize, GST_BUFFER_DATA(outbuf)+lumsize, median->width/2, median->height/2);
median_5(data+lumsize+chromsize, GST_BUFFER_DATA(outbuf)+lumsize+chromsize, median->width/2, median->height/2);
}
else {
memcpy (GST_BUFFER_DATA (outbuf)+lumsize, data+lumsize, chromsize*2);
}
}
else {
median_9(data, GST_BUFFER_DATA(outbuf), median->width, median->height);
if (!median->lum_only) {
median_9(data+lumsize, GST_BUFFER_DATA(outbuf)+lumsize, median->width/2, median->height/2);
median_9(data+lumsize+chromsize, GST_BUFFER_DATA(outbuf)+lumsize+chromsize, median->width/2, median->height/2);
}
else {
memcpy (GST_BUFFER_DATA (outbuf)+lumsize, data+lumsize, chromsize*2);
}
}
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
gst_buffer_unref(buf);
gst_pad_push(median->srcpad,outbuf);
}
static void
gst_median_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstMedian *median;
gint argvalue;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_MEDIAN(object));
median = GST_MEDIAN(object);
switch (prop_id) {
case ARG_FILTERSIZE:
argvalue = g_value_get_int (value);
if (argvalue != 5 && argvalue != 9) {
g_warning ("median: invalid filtersize (%d), must be 5 or 9\n", argvalue);
}
else {
median->filtersize = argvalue;
}
break;
case ARG_ACTIVE:
median->active = g_value_get_boolean (value);
break;
case ARG_LUM_ONLY:
median->lum_only = g_value_get_boolean (value);
break;
default:
break;
}
}
static void
gst_median_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstMedian *median;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_MEDIAN(object));
median = GST_MEDIAN(object);
switch (prop_id) {
case ARG_FILTERSIZE:
g_value_set_int (value, median->filtersize);
break;
case ARG_ACTIVE:
g_value_set_boolean (value, median->active);
break;
case ARG_LUM_ONLY:
g_value_set_boolean (value, median->lum_only);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
factory = gst_element_factory_new("median",GST_TYPE_MEDIAN,
&median_details);
g_return_val_if_fail(factory != NULL, FALSE);
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (median_sink_factory));
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (median_src_factory));
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"median",
plugin_init
};