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New gamma filter
Original commit message from CVS: New gamma filter
This commit is contained in:
parent
b95accb194
commit
6d53140c73
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@ -1,3 +1,11 @@
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2004-01-11 Arwed v. Merkatz <v.merkatz@gmx.net>
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reviewed by: David Schleef <ds@schleef.org>
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* gst/videofilter/Makefile.am:
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* gst/videofilter/gstgamma.c: Gamma correction filter. Modified
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from the patch by ds to fit in with recent make_filter changes.
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2004-01-11 Julien MOUTTE <julien@moutte.net>
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* configure.ac: Adding examples/switch/Makefile
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@ -1,6 +1,6 @@
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plugin_LTLIBRARIES = libgstvideofilter.la libgstvideoflip.la \
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libgstvideobalance.la
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libgstvideobalance.la libgstgamma.la
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noinst_LTLIBRARIES = libgstvideoexample.la
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noinst_HEADERS = gstvideofilter.h gstvideoflip.h gstvideobalance.h
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@ -28,6 +28,10 @@ libgstvideobalance_la_CFLAGS = $(GST_CFLAGS)
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libgstvideobalance_la_LIBADD =
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libgstvideobalance_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) -lm
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libgstgamma_la_SOURCES = gstgamma.c
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libgstgamma_la_CFLAGS = $(GST_CFLAGS)
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libgstgamma_la_LIBADD =
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libgstgamma_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) -lm
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gstvideoexample.c: $(srcdir)/make_filter $(srcdir)/gstvideotemplate.c
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$(srcdir)/make_filter Videoexample $(srcdir)/gstvideotemplate.c
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293
gst/videofilter/gstgamma.c
Normal file
293
gst/videofilter/gstgamma.c
Normal file
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@ -0,0 +1,293 @@
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/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) <2003> David Schleef <ds@schleef.org>
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* Copyright (C) 2003 Arwed v. Merkatz <v.merkatz@gmx.net>
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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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/*
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* This file was (probably) generated from
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* gstvideotemplate.c,v 1.12 2004/01/07 21:07:12 ds Exp
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* and
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* make_filter,v 1.6 2004/01/07 21:33:01 ds Exp
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gstvideofilter.h>
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#include <string.h>
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#include <math.h>
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#define GST_TYPE_GAMMA \
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(gst_gamma_get_type())
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#define GST_GAMMA(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GAMMA,GstGamma))
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#define GST_GAMMA_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GAMMA,GstGammaClass))
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#define GST_IS_GAMMA(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GAMMA))
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#define GST_IS_GAMMA_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GAMMA))
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typedef struct _GstGamma GstGamma;
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typedef struct _GstGammaClass GstGammaClass;
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struct _GstGamma {
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GstVideofilter videofilter;
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double gamma;
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guint8 gamma_table[256];
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};
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struct _GstGammaClass {
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GstVideofilterClass parent_class;
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};
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/* GstGamma 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_GAMMA,
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/* FILL ME */
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};
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static void gst_gamma_base_init (gpointer g_class);
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static void gst_gamma_class_init (gpointer g_class, gpointer class_data);
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static void gst_gamma_init (GTypeInstance *instance, gpointer g_class);
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static void gst_gamma_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
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static void gst_gamma_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
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static void gst_gamma_planar411(GstVideofilter *videofilter, void *dest, void *src);
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static void gst_gamma_setup(GstVideofilter *videofilter);
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static void gst_gamma_calculate_table (GstGamma *gamma);
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GType
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gst_gamma_get_type (void)
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{
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static GType gamma_type = 0;
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if (!gamma_type) {
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static const GTypeInfo gamma_info = {
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sizeof(GstGammaClass),
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gst_gamma_base_init,
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NULL,
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gst_gamma_class_init,
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NULL,
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NULL,
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sizeof(GstGamma),
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0,
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gst_gamma_init,
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};
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gamma_type = g_type_register_static(GST_TYPE_VIDEOFILTER,
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"GstGamma", &gamma_info, 0);
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}
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return gamma_type;
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}
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static GstVideofilterFormat gst_gamma_formats[] = {
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{ "I420", 12, gst_gamma_planar411, },
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};
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static void
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gst_gamma_base_init (gpointer g_class)
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{
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static GstElementDetails gamma_details = GST_ELEMENT_DETAILS (
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"Video Gamma Correction",
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"Filter/Effect/Video",
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"Adjusts gamma on a video stream",
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"Arwed v. Merkatz <v.merkatz@gmx.net"
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);
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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GstVideofilterClass *videofilter_class = GST_VIDEOFILTER_CLASS (g_class);
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int i;
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gst_element_class_set_details (element_class, &gamma_details);
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for(i=0;i<G_N_ELEMENTS(gst_gamma_formats);i++){
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gst_videofilter_class_add_format(videofilter_class,
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gst_gamma_formats + i);
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}
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gst_videofilter_class_add_pad_templates (GST_VIDEOFILTER_CLASS (g_class));
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}
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static void
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gst_gamma_class_init (gpointer g_class, gpointer class_data)
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{
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GObjectClass *gobject_class;
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GstVideofilterClass *videofilter_class;
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gobject_class = G_OBJECT_CLASS (g_class);
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videofilter_class = GST_VIDEOFILTER_CLASS (g_class);
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g_object_class_install_property(gobject_class, ARG_GAMMA,
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g_param_spec_double("gamma", "Gamma", "gamma",
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0.01, 10, 1, G_PARAM_READWRITE));
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gobject_class->set_property = gst_gamma_set_property;
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gobject_class->get_property = gst_gamma_get_property;
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videofilter_class->setup = gst_gamma_setup;
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}
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static void
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gst_gamma_init (GTypeInstance *instance, gpointer g_class)
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{
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GstGamma *gamma = GST_GAMMA (instance);
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GstVideofilter *videofilter;
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GST_DEBUG("gst_gamma_init");
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videofilter = GST_VIDEOFILTER(gamma);
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/* do stuff */
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gamma->gamma = 1;
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gst_gamma_calculate_table (gamma);
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}
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static void
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gst_gamma_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
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{
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GstGamma *gamma;
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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_GAMMA(object));
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gamma = GST_GAMMA(object);
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GST_DEBUG("gst_gamma_set_property");
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switch (prop_id) {
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case ARG_GAMMA:
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gamma->gamma = g_value_get_double (value);
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gst_gamma_calculate_table (gamma);
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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_gamma_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
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{
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GstGamma *gamma;
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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_GAMMA(object));
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gamma = GST_GAMMA(object);
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switch (prop_id) {
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case ARG_GAMMA:
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g_value_set_double (value, gamma->gamma);
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gst_gamma_calculate_table (gamma);
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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 plugin_init (GstPlugin *plugin)
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{
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if(!gst_library_load("gstvideofilter"))
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return FALSE;
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return gst_element_register (plugin, "gamma", GST_RANK_NONE,
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GST_TYPE_GAMMA);
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}
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GST_PLUGIN_DEFINE (
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"gamma",
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"Changes gamma on video images",
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plugin_init,
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VERSION,
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GST_LICENSE,
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GST_PACKAGE,
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GST_ORIGIN
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)
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static void gst_gamma_setup(GstVideofilter *videofilter)
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{
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GstGamma *gamma;
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g_return_if_fail(GST_IS_GAMMA(videofilter));
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gamma = GST_GAMMA(videofilter);
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/* if any setup needs to be done, do it here */
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}
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static void
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gst_gamma_calculate_table (GstGamma *gamma)
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{
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int n;
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double val;
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double exp;
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if (gamma->gamma == 1.0) {
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GST_VIDEOFILTER (gamma)->passthru = TRUE;
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return;
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}
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GST_VIDEOFILTER (gamma)->passthru = FALSE;
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exp = 1.0 / gamma->gamma;
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for (n = 0; n < 256; n++) {
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val = n/255.0;
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val = pow(val, exp);
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val = 255.0 * val;
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gamma->gamma_table[n] = (unsigned char) floor(val + 0.5);
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}
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}
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static void gst_gamma_planar411(GstVideofilter *videofilter,
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void *dest, void *src)
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{
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GstGamma *gamma;
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int width = gst_videofilter_get_input_width(videofilter);
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int height = gst_videofilter_get_input_height(videofilter);
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g_return_if_fail(GST_IS_GAMMA(videofilter));
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gamma = GST_GAMMA(videofilter);
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memcpy(dest,src,width * height + (width/2) * (height/2) * 2);
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if (gamma->gamma != 1.0) {
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{
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guint8 *cdest = dest;
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guint8 *csrc = src;
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int x,y;
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for (y=0; y < height; y++) {
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for (x=0; x < width; x++) {
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cdest[y*width + x] = gamma->gamma_table[(unsigned char)csrc[y*width + x]];
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}
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}
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}
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}
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}
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