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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstmedian.h"
#include <gst/video/video.h>
/* elementfactory information */
static GstElementDetails median_details = {
"Median effect",
"Filter/Effect/Video",
"Apply a median filter to an image",
"Wim Taymans <wim.taymans@chello.be>"
};
static GstStaticPadTemplate median_src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420"))
);
static GstStaticPadTemplate median_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("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_base_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, GstData * _data);
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),
(GBaseInitFunc) gst_median_base_init,
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_base_init (GstMedianClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&median_sink_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&median_src_factory));
gst_element_class_set_details (element_class, &median_details);
}
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_link (GstPad * pad, const GstCaps * caps)
{
GstMedian *filter = GST_MEDIAN (gst_pad_get_parent (pad));
GstPad *otherpad = (pad == filter->srcpad) ? filter->sinkpad : filter->srcpad;
GstStructure *structure = gst_caps_get_structure (caps, 0);
gint w, h;
GstPadLinkReturn ret;
gst_structure_get_int (structure, "width", &w);
gst_structure_get_int (structure, "height", &h);
ret = gst_pad_try_set_caps (otherpad, caps);
if (GST_PAD_LINK_SUCCESSFUL (ret)) {
filter->width = w;
filter->height = h;
}
return ret;
}
void
gst_median_init (GstMedian * median)
{
median->sinkpad =
gst_pad_new_from_template (gst_static_pad_template_get
(&median_sink_factory), "sink");
gst_pad_set_getcaps_function (median->sinkpad, gst_pad_proxy_getcaps);
gst_pad_set_link_function (median->sinkpad, gst_median_link);
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_static_pad_template_get
(&median_src_factory), "src");
gst_pad_set_getcaps_function (median->srcpad, gst_pad_proxy_getcaps);
gst_pad_set_link_function (median->sinkpad, gst_median_link);
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, GstData * _data)
{
GstBuffer *buf = GST_BUFFER (_data);
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, GST_DATA (buf));
return;
}
data = GST_BUFFER_DATA (buf);
size = GST_BUFFER_SIZE (buf);
GST_DEBUG ("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, GST_DATA (outbuf));
}
static void
gst_median_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstMedian *median;
gint argvalue;
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;
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 (GstPlugin * plugin)
{
return gst_element_register (plugin, "median",
GST_RANK_NONE, GST_TYPE_MEDIAN);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"median",
"Video median filter",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)