New gamma filter

Original commit message from CVS:
New gamma filter

2 files changed, 298 insertions, 1 deletions

diff --git a/gst/videofilter/Makefile.am b/gst/videofilter/Makefile.am
index 56e54c98..23a6da3e 100644
--- a/gst/videofilter/Makefile.am
+++ b/gst/videofilter/Makefile.am
@@ -1,6 +1,6 @@
 
 plugin_LTLIBRARIES = libgstvideofilter.la libgstvideoflip.la \
-	libgstvideobalance.la
+	libgstvideobalance.la libgstgamma.la
 noinst_LTLIBRARIES = libgstvideoexample.la
 
 noinst_HEADERS = gstvideofilter.h gstvideoflip.h gstvideobalance.h
@@ -28,6 +28,10 @@ libgstvideobalance_la_CFLAGS = $(GST_CFLAGS)
 libgstvideobalance_la_LIBADD =
 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
 	$(srcdir)/make_filter Videoexample $(srcdir)/gstvideotemplate.c
diff --git a/gst/videofilter/gstgamma.c b/gst/videofilter/gstgamma.c
new file mode 100644
index 00000000..b05127c0
--- /dev/null
+++ b/gst/videofilter/gstgamma.c
@@ -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]];
+        }
+      }
+    }
+  }
+}
+