Vertigo is another cool one

Original commit message from CVS:
Vertigo is another cool one

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 gstshagadelic.c
+libgsteffectv_la_SOURCES = gsteffectv.c gstedge.c gstaging.c gstdice.c gstwarp.c gstshagadelic.c gstvertigo.c
 libgsteffectv_la_CFLAGS = $(GST_CFLAGS)
 libgsteffectv_la_LIBADD =
 libgsteffectv_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)

gst/effectv/gstdice.c

@@ -59,7 +59,7 @@ struct _GstDiceTVClass
 {
   GstElementClass parent_class;
 
-  void (*reset) (GstElement *elem);
+  void (*reset) (GstElement *element);
 };
 
 GstElementDetails gst_dicetv_details = {
@@ -196,9 +196,9 @@ gst_dicetv_init (GstDiceTV * filter)
 }
 
 static void
-gst_dicetv_reset_handler (GstElement *elem)
+gst_dicetv_reset_handler (GstElement *element)
 {
-  GstDiceTV *filter = GST_DICETV (elem);
+  GstDiceTV *filter = GST_DICETV (element);
 
   gst_dicetv_create_map (filter);
 }

gst/effectv/gsteffectv.c

@@ -31,6 +31,7 @@ static struct _elements_entry _elements[] = {
   { "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 },
+  { "vertigoTV",  	gst_vertigotv_get_type, 	&gst_vertigotv_details,  	NULL },
   { NULL, 0 },
 };
 

gst/effectv/gsteffectv.h

@@ -30,5 +30,8 @@ extern GstElementDetails gst_warptv_details;
 GType gst_shagadelictv_get_type (void);
 extern GstElementDetails gst_shagadelictv_details;
 
+GType gst_vertigotv_get_type (void);
+extern GstElementDetails gst_vertigotv_details;
+
 extern GstPadTemplate *gst_effectv_sink_factory ();
 extern GstPadTemplate *gst_effectv_src_factory ();

gst/effectv/gstvertigo.c

+/* 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.
+ */
+
+#include <math.h>
+#include <string.h>
+#include <gst/gst.h>
+#include "gsteffectv.h"
+
+#define GST_TYPE_VERTIGOTV \
+  (gst_vertigotv_get_type())
+#define GST_VERTIGOTV(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VERTIGOTV,GstVertigoTV))
+#define GST_VERTIGOTV_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstVertigoTV))
+#define GST_IS_VERTIGOTV(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VERTIGOTV))
+#define GST_IS_VERTIGOTV_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VERTIGOTV))
+
+typedef struct _GstVertigoTV GstVertigoTV;
+typedef struct _GstVertigoTVClass GstVertigoTVClass;
+
+struct _GstVertigoTV
+{
+  GstElement element;
+
+  GstPad *sinkpad, *srcpad;
+
+  gint width, height;
+  guint32 *buffer;
+  guint32 *current_buffer, *alt_buffer;
+  gint dx, dy;
+  gint sx, sy;
+  gdouble phase;
+  gdouble phase_increment;
+  gdouble zoomrate;
+
+};
+
+struct _GstVertigoTVClass
+{
+  GstElementClass parent_class;
+
+  void (*reset) (GstElement *element);
+};
+
+GstElementDetails gst_vertigotv_details = {
+  "VertigoTV",
+  "Filter/Effect",
+  "A loopback alpha blending effector with rotating and scaling",
+  VERSION,
+  "Wim Taymans <wim.taymans@chello.be>",
+  "(C) 2001 FUKUCHI Kentarou",
+};
+
+
+/* Filter signals and args */
+enum
+{
+  /* FILL ME */
+  RESET_SIGNAL,
+  LAST_SIGNAL
+};
+
+enum
+{
+  ARG_0,
+  ARG_SPEED,
+  ARG_ZOOM_SPEED,
+};
+
+static void 	gst_vertigotv_class_init 	(GstVertigoTVClass * klass);
+static void 	gst_vertigotv_init 		(GstVertigoTV * filter);
+
+static void 	gst_vertigotv_reset_handler 	(GstElement *element);
+
+static void 	gst_vertigotv_set_property 	(GObject * object, guint prop_id,
+					  	 const GValue * value, GParamSpec * pspec);
+static void 	gst_vertigotv_get_property 	(GObject * object, guint prop_id,
+					  	 GValue * value, GParamSpec * pspec);
+
+static void 	gst_vertigotv_chain 		(GstPad * pad, GstBuffer * buf);
+
+static GstElementClass *parent_class = NULL;
+static guint gst_vertigotv_signals[LAST_SIGNAL] = { 0 };
+
+GType gst_vertigotv_get_type (void)
+{
+  static GType vertigotv_type = 0;
+
+  if (!vertigotv_type) {
+    static const GTypeInfo vertigotv_info = {
+      sizeof (GstVertigoTVClass), NULL,
+      NULL,
+      (GClassInitFunc) gst_vertigotv_class_init,
+      NULL,
+      NULL,
+      sizeof (GstVertigoTV),
+      0,
+      (GInstanceInitFunc) gst_vertigotv_init,
+    };
+
+    vertigotv_type = g_type_register_static (GST_TYPE_ELEMENT, "GstVertigoTV", &vertigotv_info, 0);
+  }
+  return vertigotv_type;
+}
+
+static void
+gst_vertigotv_class_init (GstVertigoTVClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  gst_vertigotv_signals[RESET_SIGNAL] =
+    g_signal_new ("reset_parms",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  G_STRUCT_OFFSET (GstVertigoTVClass, reset),
+                  NULL, NULL,
+                  g_cclosure_marshal_VOID__VOID,
+                  G_TYPE_NONE, 0);
+
+  klass->reset = gst_vertigotv_reset_handler;
+       
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SPEED,
+    g_param_spec_float ("speed","Speed","Control the speed of movement",
+                        0.01, 100.0, 0.02, G_PARAM_READWRITE));
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_ZOOM_SPEED,
+    g_param_spec_float ("zoom_speed","Zoom Speed","Control the rate of zooming",
+                        1.01, 1.1, 1.01, G_PARAM_READWRITE));
+
+  gobject_class->set_property = gst_vertigotv_set_property;
+  gobject_class->get_property = gst_vertigotv_get_property;
+}
+
+static void
+gst_vertigotv_reset_handler (GstElement *element)
+{
+  GstVertigoTV *filter = GST_VERTIGOTV (element);
+
+  filter->phase = 0.0;
+  filter->phase_increment = 0.02;
+  filter->zoomrate = 1.01;
+}
+
+
+static GstPadConnectReturn
+gst_vertigotv_sinkconnect (GstPad * pad, GstCaps * caps)
+{
+  GstVertigoTV *filter;
+  gint area;
+
+  filter = GST_VERTIGOTV (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->buffer);
+  filter->buffer = (guint32 *) g_malloc (area * 2 * sizeof(guint32));
+
+  bzero (filter->buffer, area * 2 * sizeof(guint32));
+  filter->current_buffer = filter->buffer;
+  filter->alt_buffer = filter->buffer + area;
+  filter->phase = 0;
+
+  if (gst_pad_try_set_caps (filter->srcpad, caps)) {
+    return GST_PAD_CONNECT_OK;
+  }
+
+  return GST_PAD_CONNECT_REFUSED;
+}
+
+static void
+gst_vertigotv_init (GstVertigoTV * filter)
+{
+  filter->sinkpad = gst_pad_new_from_template (gst_effectv_sink_factory (), "sink");
+  gst_pad_set_chain_function (filter->sinkpad, gst_vertigotv_chain);
+  gst_pad_set_connect_function (filter->sinkpad, gst_vertigotv_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->buffer = NULL;
+  filter->phase = 0.0;
+  filter->phase_increment = 0.02;
+  filter->zoomrate = 1.01;
+}
+
+static void 
+gst_vertigotv_set_parms (GstVertigoTV *filter)
+{
+  double vx, vy;
+  double t;
+  double x, y;
+  double dizz;
+
+  dizz = sin (filter->phase) * 10 + sin (filter->phase*1.9+5) * 5;
+
+  x = filter->width / 2;
+  y = filter->height / 2;
+
+  t = (x*x + y*y) * filter->zoomrate;
+
+  if (filter->width > filter->height) {
+    if (dizz >= 0) {
+      if (dizz > x) dizz = x;
+    	vx = (x * (x - dizz) + y * y) / t;
+    } else {
+      if (dizz < -x) dizz = -x;
+      vx = (x * (x + dizz) + y * y) / t;
+    }
+    vy = (dizz * y) / t;
+  } else {
+    if (dizz >= 0) {
+      if (dizz > y) dizz = y;
+      vx = (x * x + y * (y - dizz)) / t;
+    } else {
+      if (dizz < -y) dizz = -y;
+      vx = (x * x + y * (y + dizz)) / t;
+    }
+    vy = (dizz * x) / t;
+  }
+  filter->dx = vx * 65536;
+  filter->dy = vy * 65536;
+  filter->sx = (-vx * x + vy * y + x + cos (filter->phase * 5) * 2) * 65536;
+  filter->sy = (-vx * y - vy * x + y + sin (filter->phase * 6) * 2) * 65536;
+
+  filter->phase += filter->phase_increment;
+  if (filter->phase > 5700000) filter->phase = 0;
+}
+	
+static void
+gst_vertigotv_chain (GstPad * pad, GstBuffer * buf)
+{
+  GstVertigoTV *filter;
+  guint32 *src, *dest;
+  GstBuffer *outbuf;
+  guint32 *p;
+  guint32 v;
+  gint x, y;
+  gint ox, oy;
+  gint i;
+  gint width, height, area;
+
+  filter = GST_VERTIGOTV (gst_pad_get_parent (pad));
+
+  src = (guint32 *) GST_BUFFER_DATA (buf);
+
+  width = filter->width;
+  height = filter->height;
+  area = width * height;
+
+  outbuf = gst_buffer_new ();
+  GST_BUFFER_SIZE (outbuf) = area * sizeof(guint32);
+  dest = (guint32 *) GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
+  GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
+  
+  gst_vertigotv_set_parms (filter);
+  p = filter->alt_buffer;
+
+  for (y = height; y > 0; y--) {
+    ox = filter->sx;
+    oy = filter->sy;
+
+    for (x = width; x > 0; x--) {
+      i = (oy >> 16) * width + (ox >> 16);
+      if (i < 0) i = 0;
+      if (i >= area) i = area;
+      
+      v = filter->current_buffer[i] & 0xfcfcff;
+      v = (v * 3) + ((*src++) & 0xfcfcff);
+      
+      *p++ = (v >> 2);
+      ox += filter->dx;
+      oy += filter->dy;
+    }
+    filter->sx -= filter->dy;
+    filter->sy += filter->dx;
+  }
+
+  memcpy(dest, filter->alt_buffer, area * sizeof(guint32));
+
+  gst_buffer_unref (buf);
+
+  gst_pad_push (filter->srcpad, outbuf);
+
+  p = filter->current_buffer;
+  filter->current_buffer = filter->alt_buffer;
+  filter->alt_buffer = p;
+}
+
+static void
+gst_vertigotv_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  GstVertigoTV *filter;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_VERTIGOTV (object));
+
+  filter = GST_VERTIGOTV (object);
+
+  switch (prop_id) {
+    case ARG_SPEED:
+      filter->phase_increment = g_value_get_float (value);
+      break;
+    case ARG_ZOOM_SPEED:
+      filter->zoomrate = g_value_get_float (value);
+      break;
+    default:
+      break;
+  }
+}
+
+static void
+gst_vertigotv_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  GstVertigoTV *filter;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail (GST_IS_VERTIGOTV (object));
+
+  filter = GST_VERTIGOTV (object);
+
+  switch (prop_id) {
+    case ARG_SPEED:
+      g_value_set_float (value, filter->phase_increment);
+      break;
+    case ARG_ZOOM_SPEED:
+      g_value_set_float (value, filter->zoomrate);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}