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New gamma filter

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Original commit message from CVS:
New gamma filter
This commit is contained in:
David Schleef 2004-01-11 21:52:10 +00:00
parent b95accb194
commit 6d53140c73
3 changed files with 306 additions and 1 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2004-01-11 Arwed v. Merkatz <v.merkatz@gmx.net>
reviewed by: David Schleef <ds@schleef.org>
* gst/videofilter/Makefile.am:
* gst/videofilter/gstgamma.c: Gamma correction filter. Modified
from the patch by ds to fit in with recent make_filter changes.
2004-01-11 Julien MOUTTE <julien@moutte.net> 2004-01-11 Julien MOUTTE <julien@moutte.net>
* configure.ac: Adding examples/switch/Makefile * configure.ac: Adding examples/switch/Makefile

6
gst/videofilter/Makefile.am
View file

@ -1,6 +1,6 @@
plugin_LTLIBRARIES = libgstvideofilter.la libgstvideoflip.la \ plugin_LTLIBRARIES = libgstvideofilter.la libgstvideoflip.la \
libgstvideobalance.la libgstvideobalance.la libgstgamma.la
noinst_LTLIBRARIES = libgstvideoexample.la noinst_LTLIBRARIES = libgstvideoexample.la
noinst_HEADERS = gstvideofilter.h gstvideoflip.h gstvideobalance.h noinst_HEADERS = gstvideofilter.h gstvideoflip.h gstvideobalance.h
@ -28,6 +28,10 @@ libgstvideobalance_la_CFLAGS = $(GST_CFLAGS)
libgstvideobalance_la_LIBADD = libgstvideobalance_la_LIBADD =
libgstvideobalance_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) -lm libgstvideobalance_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) -lm
libgstgamma_la_SOURCES = gstgamma.c
libgstgamma_la_CFLAGS = $(GST_CFLAGS)
libgstgamma_la_LIBADD =
libgstgamma_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) -lm
gstvideoexample.c: $(srcdir)/make_filter $(srcdir)/gstvideotemplate.c gstvideoexample.c: $(srcdir)/make_filter $(srcdir)/gstvideotemplate.c
$(srcdir)/make_filter Videoexample $(srcdir)/gstvideotemplate.c $(srcdir)/make_filter Videoexample $(srcdir)/gstvideotemplate.c

293
gst/videofilter/gstgamma.c Normal file
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@ -0,0 +1,293 @@
/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2003> David Schleef <ds@schleef.org>
* Copyright (C) 2003 Arwed v. Merkatz <v.merkatz@gmx.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.
*/
/*
* This file was (probably) generated from
* gstvideotemplate.c,v 1.12 2004/01/07 21:07:12 ds Exp
* and
* make_filter,v 1.6 2004/01/07 21:33:01 ds Exp
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gstvideofilter.h>
#include <string.h>
#include <math.h>
#define GST_TYPE_GAMMA \
(gst_gamma_get_type())
#define GST_GAMMA(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GAMMA,GstGamma))
#define GST_GAMMA_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GAMMA,GstGammaClass))
#define GST_IS_GAMMA(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GAMMA))
#define GST_IS_GAMMA_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GAMMA))
typedef struct _GstGamma GstGamma;
typedef struct _GstGammaClass GstGammaClass;
struct _GstGamma {
GstVideofilter videofilter;
double gamma;
guint8 gamma_table[256];
};
struct _GstGammaClass {
GstVideofilterClass parent_class;
};
/* GstGamma signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_GAMMA,
/* FILL ME */
};
static void gst_gamma_base_init (gpointer g_class);
static void gst_gamma_class_init (gpointer g_class, gpointer class_data);
static void gst_gamma_init (GTypeInstance *instance, gpointer g_class);
static void gst_gamma_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_gamma_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static void gst_gamma_planar411(GstVideofilter *videofilter, void *dest, void *src);
static void gst_gamma_setup(GstVideofilter *videofilter);
static void gst_gamma_calculate_table (GstGamma *gamma);
GType
gst_gamma_get_type (void)
{
static GType gamma_type = 0;
if (!gamma_type) {
static const GTypeInfo gamma_info = {
sizeof(GstGammaClass),
gst_gamma_base_init,
NULL,
gst_gamma_class_init,
NULL,
NULL,
sizeof(GstGamma),
0,
gst_gamma_init,
};
gamma_type = g_type_register_static(GST_TYPE_VIDEOFILTER,
"GstGamma", &gamma_info, 0);
}
return gamma_type;
}
static GstVideofilterFormat gst_gamma_formats[] = {
{ "I420", 12, gst_gamma_planar411, },
};
static void
gst_gamma_base_init (gpointer g_class)
{
static GstElementDetails gamma_details = GST_ELEMENT_DETAILS (
"Video Gamma Correction",
"Filter/Effect/Video",
"Adjusts gamma on a video stream",
"Arwed v. Merkatz <v.merkatz@gmx.net"
);
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstVideofilterClass *videofilter_class = GST_VIDEOFILTER_CLASS (g_class);
int i;
gst_element_class_set_details (element_class, &gamma_details);
for(i=0;i<G_N_ELEMENTS(gst_gamma_formats);i++){
gst_videofilter_class_add_format(videofilter_class,
gst_gamma_formats + i);
}
gst_videofilter_class_add_pad_templates (GST_VIDEOFILTER_CLASS (g_class));
}
static void
gst_gamma_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *gobject_class;
GstVideofilterClass *videofilter_class;
gobject_class = G_OBJECT_CLASS (g_class);
videofilter_class = GST_VIDEOFILTER_CLASS (g_class);
g_object_class_install_property(gobject_class, ARG_GAMMA,
g_param_spec_double("gamma", "Gamma", "gamma",
0.01, 10, 1, G_PARAM_READWRITE));
gobject_class->set_property = gst_gamma_set_property;
gobject_class->get_property = gst_gamma_get_property;
videofilter_class->setup = gst_gamma_setup;
}
static void
gst_gamma_init (GTypeInstance *instance, gpointer g_class)
{
GstGamma *gamma = GST_GAMMA (instance);
GstVideofilter *videofilter;
GST_DEBUG("gst_gamma_init");
videofilter = GST_VIDEOFILTER(gamma);
/* do stuff */
gamma->gamma = 1;
gst_gamma_calculate_table (gamma);
}
static void
gst_gamma_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstGamma *gamma;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_GAMMA(object));
gamma = GST_GAMMA(object);
GST_DEBUG("gst_gamma_set_property");
switch (prop_id) {
case ARG_GAMMA:
gamma->gamma = g_value_get_double (value);
gst_gamma_calculate_table (gamma);
break;
default:
break;
}
}
static void
gst_gamma_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstGamma *gamma;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_GAMMA(object));
gamma = GST_GAMMA(object);
switch (prop_id) {
case ARG_GAMMA:
g_value_set_double (value, gamma->gamma);
gst_gamma_calculate_table (gamma);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean plugin_init (GstPlugin *plugin)
{
if(!gst_library_load("gstvideofilter"))
return FALSE;
return gst_element_register (plugin, "gamma", GST_RANK_NONE,
GST_TYPE_GAMMA);
}
GST_PLUGIN_DEFINE (
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gamma",
"Changes gamma on video images",
plugin_init,
VERSION,
GST_LICENSE,
GST_PACKAGE,
GST_ORIGIN
)
static void gst_gamma_setup(GstVideofilter *videofilter)
{
GstGamma *gamma;
g_return_if_fail(GST_IS_GAMMA(videofilter));
gamma = GST_GAMMA(videofilter);
/* if any setup needs to be done, do it here */
}
static void
gst_gamma_calculate_table (GstGamma *gamma)
{
int n;
double val;
double exp;
if (gamma->gamma == 1.0) {
GST_VIDEOFILTER (gamma)->passthru = TRUE;
return;
}
GST_VIDEOFILTER (gamma)->passthru = FALSE;
exp = 1.0 / gamma->gamma;
for (n = 0; n < 256; n++) {
val = n/255.0;
val = pow(val, exp);
val = 255.0 * val;
gamma->gamma_table[n] = (unsigned char) floor(val + 0.5);
}
}
static void gst_gamma_planar411(GstVideofilter *videofilter,
void *dest, void *src)
{
GstGamma *gamma;
int width = gst_videofilter_get_input_width(videofilter);
int height = gst_videofilter_get_input_height(videofilter);
g_return_if_fail(GST_IS_GAMMA(videofilter));
gamma = GST_GAMMA(videofilter);
memcpy(dest,src,width * height + (width/2) * (height/2) * 2);
if (gamma->gamma != 1.0) {
{
guint8 *cdest = dest;
guint8 *csrc = src;
int x,y;
for (y=0; y < height; y++) {
for (x=0; x < width; x++) {
cdest[y*width + x] = gamma->gamma_table[(unsigned char)csrc[y*width + x]];
}
}
}
}
}