ported the shagadelic plugin, shake it baby!

Original commit message from CVS:
ported the shagadelic plugin, shake it baby!

gst/effectv/Makefile.am

@@ -2,7 +2,7 @@ plugindir = $(libdir)/gst
 
 plugin_LTLIBRARIES = libgsteffectv.la
 
-libgsteffectv_la_SOURCES = gsteffectv.c gstedge.c gstaging.c gstdice.c gstwarp.c
+libgsteffectv_la_SOURCES = gsteffectv.c gstedge.c gstaging.c gstdice.c gstwarp.c gstshagadelic.c
 libgsteffectv_la_CFLAGS = $(GST_CFLAGS)
 libgsteffectv_la_LIBADD =
 libgsteffectv_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)

gst/effectv/gsteffectv.c

@@ -30,6 +30,7 @@ static struct _elements_entry _elements[] = {
   { "agingTV", 		gst_agingtv_get_type, 		&gst_agingtv_details, 		NULL },
   { "diceTV",  		gst_dicetv_get_type,  		&gst_dicetv_details,  		NULL },
   { "warpTV",  		gst_warptv_get_type,  		&gst_warptv_details,  		NULL },
+  { "shagadelicTV",  	gst_shagadelictv_get_type,  	&gst_shagadelictv_details,  	NULL },
   { NULL, 0 },
 };
 

gst/effectv/gsteffectv.h

@@ -27,5 +27,8 @@ extern GstElementDetails gst_dicetv_details;
 GType gst_warptv_get_type (void);
 extern GstElementDetails gst_warptv_details;
 
+GType gst_shagadelictv_get_type (void);
+extern GstElementDetails gst_shagadelictv_details;
+
 extern GstPadTemplate *gst_effectv_sink_factory ();
 extern GstPadTemplate *gst_effectv_src_factory ();

gst/effectv/gstshagadelic.c

@@ -0,0 +1,330 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * EffecTV:
+ * Copyright (C) 2001 FUKUCHI Kentarou
+ *
+ * EffecTV is free software. We release this product under the terms of the
+ * GNU General Public License version 2. The license is included in the file
+ * COPYING.
+ *
+ * This program 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 General Public License for more details.
+ */
+/*
+ * Inspired by Adrian Likin's script for the GIMP.
+ */
+
+#include <math.h>
+#include <string.h>
+#include <gst/gst.h>
+#include "gsteffectv.h"
+
+#define GST_TYPE_SHAGADELICTV \
+  (gst_shagadelictv_get_type())
+#define GST_SHAGADELICTV(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SHAGADELICTV,GstShagadelicTV))
+#define GST_SHAGADELICTV_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstShagadelicTV))
+#define GST_IS_SHAGADELICTV(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SHAGADELICTV))
+#define GST_IS_SHAGADELICTV_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_SHAGADELICTV))
+
+typedef struct _GstShagadelicTV GstShagadelicTV;
+typedef struct _GstShagadelicTVClass GstShagadelicTVClass;
+
+struct _GstShagadelicTV
+{
+  GstElement element;
+
+  GstPad *sinkpad, *srcpad;
+
+  gint width, height;
+  gint stat;
+  gchar *ripple;
+  gchar *spiral;
+  guchar phase;
+  gint rx, ry;
+  gint bx, by;
+  gint rvx, rvy;
+  gint bvx, bvy;
+};
+
+struct _GstShagadelicTVClass
+{
+  GstElementClass parent_class;
+};
+
+GstElementDetails gst_shagadelictv_details = {
+  "ShagadelicTV",
+  "Filter/Effect",
+  "Oh behave, ShagedelicTV makes images shagadelic!",
+  VERSION,
+  "Wim Taymans <wim.taymans@chello.be>",
+  "(C) 2001 FUKUCHI Kentarou",
+};
+
+
+/* Filter signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0,
+};
+
+static void 	gst_shagadelictv_class_init 	(GstShagadelicTVClass * klass);
+static void 	gst_shagadelictv_init 		(GstShagadelicTV * filter);
+
+static void 	gst_shagadelic_initialize 	(GstShagadelicTV *filter);
+
+static void 	gst_shagadelictv_set_property 	(GObject * object, guint prop_id,
+					  	 const GValue * value, GParamSpec * pspec);
+static void 	gst_shagadelictv_get_property 	(GObject * object, guint prop_id,
+					  	 GValue * value, GParamSpec * pspec);
+
+static void 	gst_shagadelictv_chain 		(GstPad * pad, GstBuffer * buf);
+
+static GstElementClass *parent_class = NULL;
+/*static guint gst_shagadelictv_signals[LAST_SIGNAL] = { 0 }; */
+
+GType gst_shagadelictv_get_type (void)
+{
+  static GType shagadelictv_type = 0;
+
+  if (!shagadelictv_type) {
+    static const GTypeInfo shagadelictv_info = {
+      sizeof (GstShagadelicTVClass), NULL,
+      NULL,
+      (GClassInitFunc) gst_shagadelictv_class_init,
+      NULL,
+      NULL,
+      sizeof (GstShagadelicTV),
+      0,
+      (GInstanceInitFunc) gst_shagadelictv_init,
+    };
+
+    shagadelictv_type = g_type_register_static (GST_TYPE_ELEMENT, "GstShagadelicTV", &shagadelictv_info, 0);
+  }
+  return shagadelictv_type;
+}
+
+static void
+gst_shagadelictv_class_init (GstShagadelicTVClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  gobject_class->set_property = gst_shagadelictv_set_property;
+  gobject_class->get_property = gst_shagadelictv_get_property;
+}
+
+static GstPadConnectReturn
+gst_shagadelictv_sinkconnect (GstPad * pad, GstCaps * caps)
+{
+  GstShagadelicTV *filter;
+  gint area;
+
+  filter = GST_SHAGADELICTV (gst_pad_get_parent (pad));
+
+  if (!GST_CAPS_IS_FIXED (caps))
+    return GST_PAD_CONNECT_DELAYED;
+
+  gst_caps_get_int (caps, "width", &filter->width);
+  gst_caps_get_int (caps, "height", &filter->height);
+
+  area = filter->width * filter->height;
+
+  g_free (filter->ripple);
+  g_free (filter->spiral);
+
+  filter->ripple = (gchar *) g_malloc (area * 4);
+  filter->spiral = (gchar *) g_malloc (area);
+
+  gst_shagadelic_initialize (filter);
+
+  if (gst_pad_try_set_caps (filter->srcpad, caps)) {
+    return GST_PAD_CONNECT_OK;
+  }
+
+  return GST_PAD_CONNECT_REFUSED;
+}
+
+static void
+gst_shagadelictv_init (GstShagadelicTV * filter)
+{
+  filter->sinkpad = gst_pad_new_from_template (gst_effectv_sink_factory (), "sink");
+  gst_pad_set_chain_function (filter->sinkpad, gst_shagadelictv_chain);
+  gst_pad_set_connect_function (filter->sinkpad, gst_shagadelictv_sinkconnect);
+  gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
+
+  filter->srcpad = gst_pad_new_from_template (gst_effectv_src_factory (), "src");
+  gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
+
+  filter->ripple = NULL;
+  filter->spiral = NULL;
+}
+
+static unsigned int
+fastrand (void)
+{   
+  static unsigned int fastrand_val;
+
+  return (fastrand_val = fastrand_val * 1103515245 + 12345);
+}
+
+static void
+gst_shagadelic_initialize (GstShagadelicTV *filter)
+{
+  int i, x, y;
+#ifdef PS2
+  float xx, yy;
+#else
+  double xx, yy;
+#endif
+
+  i = 0;
+  for(y = 0; y < filter->height * 2; y++) {
+    yy = y - filter->height;
+    yy *= yy;
+
+    for (x = 0; x < filter->width * 2; x++) {
+      xx = x - filter->width;
+#ifdef PS2
+      filter->ripple[i++] = ((unsigned int)(sqrtf(xx*xx+yy)*8))&255;
+#else
+      filter->ripple[i++] = ((unsigned int)(sqrt(xx*xx+yy)*8))&255;
+#endif
+    }
+  }
+
+  i = 0;
+  for (y = 0; y < filter->height; y++) {
+    yy = y - filter->height/2;
+    
+    for (x = 0; x < filter->width; x++) {
+      xx = x - filter->width/2;
+#ifdef PS2
+      filter->spiral[i++] = ((unsigned int)
+	((atan2f(xx, yy)/((float)M_PI)*256*9) + (sqrtf(xx*xx+yy*yy)*5)))&255;
+#else
+      filter->spiral[i++] = ((unsigned int)
+	((atan2(xx, yy)/M_PI*256*9) + (sqrt(xx*xx+yy*yy)*5)))&255;
+#endif
+/* Here is another Swinger!
+ * ((atan2(xx, yy)/M_PI*256) + (sqrt(xx*xx+yy*yy)*10))&255;
+ */
+    }
+  }
+  filter->rx = fastrand () % filter->width;
+  filter->ry = fastrand () % filter->height;
+  filter->bx = fastrand () % filter->width;
+  filter->by = fastrand () % filter->height;
+  filter->rvx = -2;
+  filter->rvy = -2;
+  filter->bvx = 2;
+  filter->bvy = 2;
+  filter->phase = 0;
+}
+
+int shagadelicDraw()
+{
+	return 0;
+}
+static void
+gst_shagadelictv_chain (GstPad * pad, GstBuffer * buf)
+{
+  GstShagadelicTV *filter;
+  guint32 *src, *dest;
+  GstBuffer *outbuf;
+  gint x, y;
+  guint32 v;
+  guchar r, g, b;
+  gint width, height;
+
+  filter = GST_SHAGADELICTV (gst_pad_get_parent (pad));
+
+  src = (guint32 *) GST_BUFFER_DATA (buf);
+
+  outbuf = gst_buffer_new ();
+  GST_BUFFER_SIZE (outbuf) = (filter->width * filter->height * 4);
+  dest = (guint32 *) GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
+  GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
+
+  width = filter->width;
+  height = filter->height;
+
+  for (y = 0; y < height; y++) {
+    for (x = 0; x < width; x++) {
+      v = *src++ | 0x1010100;
+      v = (v - 0x707060) & 0x1010100;
+      v -= v >> 8;
+/* Try another Babe! 
+ * v = *src++;
+ * *dest++ = v & ((r<<16)|(g<<8)|b);
+ */
+      r = (gchar) (filter->ripple[(filter->ry + y) * width * 2 + filter->rx + x] + filter->phase * 2) >> 7;
+      g = (gchar) (filter->spiral[y * width + x] + filter->phase * 3) >> 7;
+      b = (gchar) (filter->ripple[(filter->by + y) * width * 2 + filter->bx + x] - filter->phase) >> 7;
+      *dest++ = v & ((r << 16) | (g << 8) | b);
+    }
+  }
+
+  filter->phase -= 8;
+  if ((filter->rx + filter->rvx) < 0 || (filter->rx + filter->rvx) >= width)  filter->rvx =- filter->rvx;
+  if ((filter->ry + filter->rvy) < 0 || (filter->ry + filter->rvy) >= height) filter->rvy =- filter->rvy;
+  if ((filter->bx + filter->bvx) < 0 || (filter->bx + filter->bvx) >= width)  filter->bvx =- filter->bvx;
+  if ((filter->by + filter->bvy) < 0 || (filter->by + filter->bvy) >= height) filter->bvy =- filter->bvy;
+  filter->rx += filter->rvx;
+  filter->ry += filter->rvy;
+  filter->bx += filter->bvx;
+  filter->by += filter->bvy;
+
+  gst_buffer_unref (buf);
+
+  gst_pad_push (filter->srcpad, outbuf);
+}
+
+static void
+gst_shagadelictv_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  GstShagadelicTV *filter;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_SHAGADELICTV (object));
+
+  filter = GST_SHAGADELICTV (object);
+
+  switch (prop_id) {
+    default:
+      break;
+  }
+}
+
+static void
+gst_shagadelictv_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  GstShagadelicTV *filter;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_SHAGADELICTV (object));
+
+  filter = GST_SHAGADELICTV (object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}