gstreamer/gst/smooth/gstsmooth.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* <2001> Wim Taymans <wim.taymans@chello.be>
* <2011> Stefan Sauer <ensonic@user.sf.net>
*
* 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 "gstsmooth.h"
#include <gst/video/video.h>
/* Smooth args */
enum
{
PROP_0,
PROP_ACTIVE,
PROP_TOLERANCE,
PROP_FILTER_SIZE,
PROP_LUMA_ONLY
};
static GstStaticPadTemplate gst_smooth_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420")
)
);
static GstStaticPadTemplate gst_smooth_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420")
)
);
static gboolean gst_smooth_set_caps (GstBaseTransform * btrans,
GstCaps * incaps, GstCaps * outcaps);
static GstFlowReturn gst_smooth_transform (GstBaseTransform * btrans,
GstBuffer * inbuf, GstBuffer * outbuf);
static void smooth_filter (unsigned char *dest, unsigned char *src,
int width, int height, int tolerance, int filtersize);
static void gst_smooth_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_smooth_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
GST_BOILERPLATE (GstSmooth, gst_smooth, GstVideoFilter, GST_TYPE_VIDEO_FILTER);
static void
gst_smooth_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_smooth_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_smooth_src_template));
gst_element_class_set_details_simple (element_class, "Smooth effect",
"Filter/Effect/Video",
"Apply a smooth filter to an image",
"Wim Taymans <wim.taymans@chello.be>");
}
static void
gst_smooth_class_init (GstSmoothClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBaseTransformClass *btrans_class = (GstBaseTransformClass *) klass;
gobject_class->set_property = gst_smooth_set_property;
gobject_class->get_property = gst_smooth_get_property;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ACTIVE,
g_param_spec_boolean ("active", "active", "process video", TRUE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TOLERANCE,
g_param_spec_int ("tolerance",
"tolerance", "contrast tolerance for smoothing", G_MININT,
G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FILTER_SIZE,
g_param_spec_int ("filter-size", "filter-size", "size of media filter",
G_MININT, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_LUMA_ONLY,
g_param_spec_boolean ("luma-only", "luma-only", "only filter luma part",
TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
btrans_class->transform = GST_DEBUG_FUNCPTR (gst_smooth_transform);
btrans_class->set_caps = GST_DEBUG_FUNCPTR (gst_smooth_set_caps);
}
static gboolean
gst_smooth_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstSmooth *filter;
GstStructure *structure;
gboolean ret;
filter = GST_SMOOTH (btrans);
structure = gst_caps_get_structure (incaps, 0);
ret = gst_structure_get_int (structure, "width", &filter->width);
ret &= gst_structure_get_int (structure, "height", &filter->height);
return ret;
}
static void
gst_smooth_init (GstSmooth * smooth, GstSmoothClass * klass)
{
smooth->active = TRUE;
smooth->tolerance = 8;
smooth->filtersize = 3;
smooth->luma_only = TRUE;
}
static void
smooth_filter (guchar * dest, guchar * src, gint width, gint height,
gint tolerance, gint filtersize)
{
gint refval, aktval, upperval, lowerval, numvalues, sum;
gint x, y, fx, fy, fy1, fy2, fx1, fx2;
guchar *srcp = src;
fy1 = 0;
fy2 = MIN (filtersize + 1, height) * width;
for (y = 0; y < height; y++) {
if (y > (filtersize + 1))
fy1 += width;
if (y < height - (filtersize + 1))
fy2 += width;
for (x = 0; x < width; x++) {
refval = *src;
upperval = refval + tolerance;
lowerval = refval - tolerance;
numvalues = 1;
sum = refval;
fx1 = MAX (x - filtersize, 0) + fy1;
fx2 = MIN (x + filtersize + 1, width) + fy1;
for (fy = fy1; fy < fy2; fy += width) {
for (fx = fx1; fx < fx2; fx++) {
aktval = srcp[fx];
if ((lowerval - aktval) * (upperval - aktval) < 0) {
numvalues++;
sum += aktval;
}
} /*for fx */
fx1 += width;
fx2 += width;
} /*for fy */
src++;
*dest++ = sum / numvalues;
}
}
}
static GstFlowReturn
gst_smooth_transform (GstBaseTransform * btrans, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstSmooth *smooth;
guint8 *idata, *odata;
guint size, lumsize, chromsize;
smooth = GST_SMOOTH (btrans);
idata = GST_BUFFER_DATA (inbuf);
odata = GST_BUFFER_DATA (outbuf);
size = GST_BUFFER_SIZE (inbuf);
if (!smooth->active) {
memcpy (odata, idata, size);
return GST_FLOW_OK;
}
GST_DEBUG_OBJECT (smooth, "smooth: have buffer of %d", size);
lumsize = smooth->width * smooth->height;
chromsize = lumsize / 4;
smooth_filter (odata, idata, smooth->width, smooth->height,
smooth->tolerance, smooth->filtersize);
if (!smooth->luma_only) {
smooth_filter (odata + lumsize, idata + lumsize,
smooth->width / 2, smooth->height / 2, smooth->tolerance,
smooth->filtersize / 2);
smooth_filter (odata + lumsize + chromsize,
idata + lumsize + chromsize, smooth->width / 2, smooth->height / 2,
smooth->tolerance, smooth->filtersize / 2);
} else {
memcpy (odata + lumsize, idata + lumsize, chromsize * 2);
}
return GST_FLOW_OK;
}
static void
gst_smooth_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstSmooth *smooth;
g_return_if_fail (GST_IS_SMOOTH (object));
smooth = GST_SMOOTH (object);
switch (prop_id) {
case PROP_ACTIVE:
smooth->active = g_value_get_boolean (value);
break;
case PROP_TOLERANCE:
smooth->tolerance = g_value_get_int (value);
break;
case PROP_FILTER_SIZE:
smooth->filtersize = g_value_get_int (value);
break;
case PROP_LUMA_ONLY:
smooth->luma_only = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_smooth_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstSmooth *smooth;
g_return_if_fail (GST_IS_SMOOTH (object));
smooth = GST_SMOOTH (object);
switch (prop_id) {
case PROP_ACTIVE:
g_value_set_boolean (value, smooth->active);
break;
case PROP_TOLERANCE:
g_value_set_int (value, smooth->tolerance);
break;
case PROP_FILTER_SIZE:
g_value_set_int (value, smooth->filtersize);
break;
case PROP_LUMA_ONLY:
g_value_set_boolean (value, smooth->luma_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, "smooth",
GST_RANK_NONE, GST_TYPE_SMOOTH);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"smooth",
"Apply a smooth filter to an image",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)