gst/geometrictransform/gstgeometrictransform.c - mtk-gst-plugins-bad-debian - Git at Google

 /* GStreamer
  * Copyright (C) <2010> Thiago Santos <thiago.sousa.santos@collabora.co.uk>
  *
  * 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., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include "gstgeometrictransform.h"
 #include "geometricmath.h"
 #include <string.h>

 GST_DEBUG_CATEGORY_STATIC (geometric_transform_debug);
 #define GST_CAT_DEFAULT geometric_transform_debug

 static GstStaticPadTemplate gst_geometric_transform_src_template =
 GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ ARGB, BGR, BGRA, BGRx, RGB, "
             "RGBA, RGBx, AYUV, xBGR, xRGB, GRAY8, GRAY16_BE, GRAY16_LE }"))
     );

 static GstStaticPadTemplate gst_geometric_transform_sink_template =
 GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ ARGB, BGR, BGRA, BGRx, RGB, "
             "RGBA, RGBx, AYUV, xBGR, xRGB, GRAY8, GRAY16_BE, GRAY16_LE }"))
     );

 static GstVideoFilterClass *parent_class = NULL;

 enum
 {
   PROP_0,
   PROP_OFF_EDGE_PIXELS
 };

 #define GST_GT_OFF_EDGES_PIXELS_METHOD_TYPE ( \
     gst_geometric_transform_off_edges_pixels_method_get_type())
 static GType
 gst_geometric_transform_off_edges_pixels_method_get_type (void)
 {
   static GType method_type = 0;

   static const GEnumValue method_types[] = {
     {GST_GT_OFF_EDGES_PIXELS_IGNORE, "Ignore", "ignore"},
     {GST_GT_OFF_EDGES_PIXELS_CLAMP, "Clamp", "clamp"},
     {GST_GT_OFF_EDGES_PIXELS_WRAP, "Wrap", "wrap"},
     {0, NULL, NULL}
   };

   if (!method_type) {
     method_type =
         g_enum_register_static ("GstGeometricTransformOffEdgesPixelsMethod",
         method_types);
   }
   return method_type;
 }

 #define DEFAULT_OFF_EDGE_PIXELS GST_GT_OFF_EDGES_PIXELS_IGNORE

 /* must be called with the object lock */
 static gboolean
 gst_geometric_transform_generate_map (GstGeometricTransform * gt)
 {
   gint x, y;
   gdouble in_x, in_y;
   gboolean ret = TRUE;
   GstGeometricTransformClass *klass;
   gdouble *ptr;

   GST_INFO_OBJECT (gt, "Generating new transform map");

   /* cleanup old map */
   g_free (gt->map);
   gt->map = NULL;

   klass = GST_GEOMETRIC_TRANSFORM_GET_CLASS (gt);

   /* subclass must have defined the map_func */
   g_return_val_if_fail (klass->map_func, FALSE);

   /*
    * (x,y) pairs of the inverse mapping
    */
   gt->map = g_malloc0 (sizeof (gdouble) * gt->width * gt->height * 2);
   ptr = gt->map;

   for (y = 0; y < gt->height; y++) {
     for (x = 0; x < gt->width; x++) {
       if (!klass->map_func (gt, x, y, &in_x, &in_y)) {
         /* child should have warned */
         ret = FALSE;
         goto end;
       }

       ptr[0] = in_x;
       ptr[1] = in_y;
       ptr += 2;
     }
   }

 end:
   if (!ret) {
     GST_WARNING_OBJECT (gt, "Generating transform map failed");
     g_free (gt->map);
     gt->map = NULL;
   } else
     gt->needs_remap = FALSE;
   return ret;
 }

 static gboolean
 gst_geometric_transform_set_info (GstVideoFilter * vfilter, GstCaps * incaps,
     GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
 {
   GstGeometricTransform *gt;
   gboolean ret = TRUE;
   gint old_width;
   gint old_height;
   GstGeometricTransformClass *klass;

   gt = GST_GEOMETRIC_TRANSFORM_CAST (vfilter);
   klass = GST_GEOMETRIC_TRANSFORM_GET_CLASS (gt);

   old_width = gt->width;
   old_height = gt->height;

   gt->width = in_info->width;
   gt->height = in_info->height;
   gt->row_stride = in_info->stride[0];
   gt->pixel_stride = GST_VIDEO_INFO_COMP_PSTRIDE (in_info, 0);

   /* regenerate the map */
   GST_OBJECT_LOCK (gt);
   if (gt->map == NULL || old_width == 0 || old_height == 0
       || gt->width != old_width || gt->height != old_height) {
     if (klass->prepare_func)
       if (!klass->prepare_func (gt)) {
         GST_OBJECT_UNLOCK (gt);
         return FALSE;
       }
     if (gt->precalc_map)
       gst_geometric_transform_generate_map (gt);
   }
   GST_OBJECT_UNLOCK (gt);
   return ret;
 }

 static void
 gst_geometric_transform_do_map (GstGeometricTransform * gt, guint8 * in_data,
     guint8 * out_data, gint x, gint y, gdouble in_x, gdouble in_y)
 {
   gint in_offset;
   gint out_offset;

   out_offset = y * gt->row_stride + x * gt->pixel_stride;

   /* operate on out of edge pixels */
   switch (gt->off_edge_pixels) {
     case GST_GT_OFF_EDGES_PIXELS_CLAMP:
       in_x = CLAMP (in_x, 0, gt->width - 1);
       in_y = CLAMP (in_y, 0, gt->height - 1);
       break;

     case GST_GT_OFF_EDGES_PIXELS_WRAP:
       in_x = gst_gm_mod_float (in_x, gt->width);
       in_y = gst_gm_mod_float (in_y, gt->height);
       if (in_x < 0)
         in_x += gt->width;
       if (in_y < 0)
         in_y += gt->height;
       break;

     default:
       break;
   }

   {
     gint trunc_x = (gint) in_x;
     gint trunc_y = (gint) in_y;
     /* only set the values if the values are valid */
     if (trunc_x >= 0 && trunc_x < gt->width && trunc_y >= 0 &&
         trunc_y < gt->height) {
       in_offset = trunc_y * gt->row_stride + trunc_x * gt->pixel_stride;

       memcpy (out_data + out_offset, in_data + in_offset, gt->pixel_stride);
     }
   }
 }

 static void
 gst_geometric_transform_before_transform (GstBaseTransform * trans,
     GstBuffer * outbuf)
 {
   GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM_CAST (trans);
   GstClockTime timestamp, stream_time;

   timestamp = GST_BUFFER_TIMESTAMP (outbuf);
   stream_time =
       gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME, timestamp);

   GST_DEBUG_OBJECT (gt, "sync to %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp));

   if (GST_CLOCK_TIME_IS_VALID (stream_time))
     gst_object_sync_values (GST_OBJECT (gt), stream_time);
 }

 static GstFlowReturn
 gst_geometric_transform_transform_frame (GstVideoFilter * vfilter,
     GstVideoFrame * in_frame, GstVideoFrame * out_frame)
 {
   GstGeometricTransform *gt;
   GstGeometricTransformClass *klass;
   gint x, y, i;
   GstFlowReturn ret = GST_FLOW_OK;
   gdouble *ptr;
   guint8 *in_data;
   guint8 *out_data;

   gt = GST_GEOMETRIC_TRANSFORM_CAST (vfilter);
   klass = GST_GEOMETRIC_TRANSFORM_GET_CLASS (gt);

   in_data = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
   out_data = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);

   if (GST_VIDEO_FRAME_FORMAT (out_frame) == GST_VIDEO_FORMAT_AYUV) {
     /* in AYUV black is not just all zeros:
      * 0x10 is black for Y,
      * 0x80 is black for Cr and Cb */
     for (i = 0; i < out_frame->map[0].size; i += 4)
       GST_WRITE_UINT32_BE (out_data + i, 0xff108080);
   } else {
     memset (out_data, 0, out_frame->map[0].size);
   }

   GST_OBJECT_LOCK (gt);
   if (gt->precalc_map) {
     if (gt->needs_remap) {
       if (klass->prepare_func)
         if (!klass->prepare_func (gt)) {
           ret = FALSE;
           goto end;
         }
       gst_geometric_transform_generate_map (gt);
     }
     g_return_val_if_fail (gt->map, GST_FLOW_ERROR);
     ptr = gt->map;
     for (y = 0; y < gt->height; y++) {
       for (x = 0; x < gt->width; x++) {
         /* do the mapping */
         gst_geometric_transform_do_map (gt, in_data, out_data, x, y, ptr[0],
             ptr[1]);
         ptr += 2;
       }
     }
   } else {
     for (y = 0; y < gt->height; y++) {
       for (x = 0; x < gt->width; x++) {
         gdouble in_x, in_y;

         if (klass->map_func (gt, x, y, &in_x, &in_y)) {
           gst_geometric_transform_do_map (gt, in_data, out_data, x, y, in_x,
               in_y);
         } else {
           GST_WARNING_OBJECT (gt, "Failed to do mapping for %d %d", x, y);
           ret = GST_FLOW_ERROR;
           goto end;
         }
       }
     }
   }
 end:
   GST_OBJECT_UNLOCK (gt);
   return ret;
 }

 static void
 gst_geometric_transform_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec)
 {
   GstGeometricTransform *gt;

   gt = GST_GEOMETRIC_TRANSFORM_CAST (object);

   switch (prop_id) {
     case PROP_OFF_EDGE_PIXELS:
       GST_OBJECT_LOCK (gt);
       gt->off_edge_pixels = g_value_get_enum (value);
       GST_OBJECT_UNLOCK (gt);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
 }

 static void
 gst_geometric_transform_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstGeometricTransform *gt;

   gt = GST_GEOMETRIC_TRANSFORM_CAST (object);

   switch (prop_id) {
     case PROP_OFF_EDGE_PIXELS:
       g_value_set_enum (value, gt->off_edge_pixels);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
 }


 static gboolean
 gst_geometric_transform_stop (GstBaseTransform * trans)
 {
   GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM_CAST (trans);

   GST_INFO_OBJECT (gt, "Deleting transform map");

   gt->width = 0;
   gt->height = 0;

   g_free (gt->map);
   gt->map = NULL;

   return TRUE;
 }

 static void
 gst_geometric_transform_base_init (gpointer g_class)
 {
   GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

   gst_element_class_add_pad_template (element_class,
       gst_static_pad_template_get (&gst_geometric_transform_sink_template));
   gst_element_class_add_pad_template (element_class,
       gst_static_pad_template_get (&gst_geometric_transform_src_template));
 }

 static void
 gst_geometric_transform_class_init (gpointer klass, gpointer class_data)
 {
   GObjectClass *obj_class;
   GstBaseTransformClass *trans_class;
   GstVideoFilterClass *vfilter_class;

   obj_class = (GObjectClass *) klass;
   trans_class = (GstBaseTransformClass *) klass;
   vfilter_class = (GstVideoFilterClass *) klass;

   parent_class = g_type_class_peek_parent (klass);

   obj_class->set_property = gst_geometric_transform_set_property;
   obj_class->get_property = gst_geometric_transform_get_property;

   trans_class->stop = GST_DEBUG_FUNCPTR (gst_geometric_transform_stop);
   trans_class->before_transform =
       GST_DEBUG_FUNCPTR (gst_geometric_transform_before_transform);

   vfilter_class->set_info =
       GST_DEBUG_FUNCPTR (gst_geometric_transform_set_info);
   vfilter_class->transform_frame =
       GST_DEBUG_FUNCPTR (gst_geometric_transform_transform_frame);

   g_object_class_install_property (obj_class, PROP_OFF_EDGE_PIXELS,
       g_param_spec_enum ("off-edge-pixels", "Off edge pixels",
           "What to do with off edge pixels",
           GST_GT_OFF_EDGES_PIXELS_METHOD_TYPE, DEFAULT_OFF_EDGE_PIXELS,
           GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 }

 static void
 gst_geometric_transform_init (GTypeInstance * instance, gpointer g_class)
 {
   GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM_CAST (instance);

   gt->off_edge_pixels = DEFAULT_OFF_EDGE_PIXELS;
   gt->precalc_map = TRUE;
   gt->needs_remap = TRUE;
 }

 GType
 gst_geometric_transform_get_type (void)
 {
   static GType geometric_transform_type = 0;

   if (!geometric_transform_type) {
     static const GTypeInfo geometric_transform_info = {
       sizeof (GstGeometricTransformClass),
       gst_geometric_transform_base_init,
       NULL,
       gst_geometric_transform_class_init,
       NULL,
       NULL,
       sizeof (GstGeometricTransform),
       0,
       gst_geometric_transform_init,
     };

     geometric_transform_type = g_type_register_static (GST_TYPE_VIDEO_FILTER,
         "GstGeometricTransform", &geometric_transform_info,
         G_TYPE_FLAG_ABSTRACT);

     GST_DEBUG_CATEGORY_INIT (geometric_transform_debug, "geometrictransform", 0,
         "Base class for geometric transform elements");
   }
   return geometric_transform_type;
 }

 /*
  * Must be called with the object lock
  */
 void
 gst_geometric_transform_set_need_remap (GstGeometricTransform * gt)
 {
   gt->needs_remap = TRUE;
 }
	/* GStreamer
	* Copyright (C) <2010> Thiago Santos <thiago.sousa.santos@collabora.co.uk>
	*
	* 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., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include "gstgeometrictransform.h"
	#include "geometricmath.h"
	#include <string.h>

	GST_DEBUG_CATEGORY_STATIC (geometric_transform_debug);
	#define GST_CAT_DEFAULT geometric_transform_debug

	static GstStaticPadTemplate gst_geometric_transform_src_template =
	GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ ARGB, BGR, BGRA, BGRx, RGB, "
	"RGBA, RGBx, AYUV, xBGR, xRGB, GRAY8, GRAY16_BE, GRAY16_LE }"))
	);

	static GstStaticPadTemplate gst_geometric_transform_sink_template =
	GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ ARGB, BGR, BGRA, BGRx, RGB, "
	"RGBA, RGBx, AYUV, xBGR, xRGB, GRAY8, GRAY16_BE, GRAY16_LE }"))
	);

	static GstVideoFilterClass *parent_class = NULL;

	enum
	{
	PROP_0,
	PROP_OFF_EDGE_PIXELS
	};

	#define GST_GT_OFF_EDGES_PIXELS_METHOD_TYPE ( \
	gst_geometric_transform_off_edges_pixels_method_get_type())
	static GType
	gst_geometric_transform_off_edges_pixels_method_get_type (void)
	{
	static GType method_type = 0;

	static const GEnumValue method_types[] = {
	{GST_GT_OFF_EDGES_PIXELS_IGNORE, "Ignore", "ignore"},
	{GST_GT_OFF_EDGES_PIXELS_CLAMP, "Clamp", "clamp"},
	{GST_GT_OFF_EDGES_PIXELS_WRAP, "Wrap", "wrap"},
	{0, NULL, NULL}
	};

	if (!method_type) {
	method_type =
	g_enum_register_static ("GstGeometricTransformOffEdgesPixelsMethod",
	method_types);
	}
	return method_type;
	}

	#define DEFAULT_OFF_EDGE_PIXELS GST_GT_OFF_EDGES_PIXELS_IGNORE

	/* must be called with the object lock */
	static gboolean
	gst_geometric_transform_generate_map (GstGeometricTransform * gt)
	{
	gint x, y;
	gdouble in_x, in_y;
	gboolean ret = TRUE;
	GstGeometricTransformClass *klass;
	gdouble *ptr;

	GST_INFO_OBJECT (gt, "Generating new transform map");

	/* cleanup old map */
	g_free (gt->map);
	gt->map = NULL;

	klass = GST_GEOMETRIC_TRANSFORM_GET_CLASS (gt);

	/* subclass must have defined the map_func */
	g_return_val_if_fail (klass->map_func, FALSE);

	/*
	* (x,y) pairs of the inverse mapping
	*/
	gt->map = g_malloc0 (sizeof (gdouble) * gt->width * gt->height * 2);
	ptr = gt->map;

	for (y = 0; y < gt->height; y++) {
	for (x = 0; x < gt->width; x++) {
	if (!klass->map_func (gt, x, y, &in_x, &in_y)) {
	/* child should have warned */
	ret = FALSE;
	goto end;
	}

	ptr[0] = in_x;
	ptr[1] = in_y;
	ptr += 2;
	}
	}

	end:
	if (!ret) {
	GST_WARNING_OBJECT (gt, "Generating transform map failed");
	g_free (gt->map);
	gt->map = NULL;
	} else
	gt->needs_remap = FALSE;
	return ret;
	}

	static gboolean
	gst_geometric_transform_set_info (GstVideoFilter * vfilter, GstCaps * incaps,
	GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
	{
	GstGeometricTransform *gt;
	gboolean ret = TRUE;
	gint old_width;
	gint old_height;
	GstGeometricTransformClass *klass;

	gt = GST_GEOMETRIC_TRANSFORM_CAST (vfilter);
	klass = GST_GEOMETRIC_TRANSFORM_GET_CLASS (gt);

	old_width = gt->width;
	old_height = gt->height;

	gt->width = in_info->width;
	gt->height = in_info->height;
	gt->row_stride = in_info->stride[0];
	gt->pixel_stride = GST_VIDEO_INFO_COMP_PSTRIDE (in_info, 0);

	/* regenerate the map */
	GST_OBJECT_LOCK (gt);
	if (gt->map == NULL \|\| old_width == 0 \|\| old_height == 0
	\|\| gt->width != old_width \|\| gt->height != old_height) {
	if (klass->prepare_func)
	if (!klass->prepare_func (gt)) {
	GST_OBJECT_UNLOCK (gt);
	return FALSE;
	}
	if (gt->precalc_map)
	gst_geometric_transform_generate_map (gt);
	}
	GST_OBJECT_UNLOCK (gt);
	return ret;
	}

	static void
	gst_geometric_transform_do_map (GstGeometricTransform * gt, guint8 * in_data,
	guint8 * out_data, gint x, gint y, gdouble in_x, gdouble in_y)
	{
	gint in_offset;
	gint out_offset;

	out_offset = y * gt->row_stride + x * gt->pixel_stride;

	/* operate on out of edge pixels */
	switch (gt->off_edge_pixels) {
	case GST_GT_OFF_EDGES_PIXELS_CLAMP:
	in_x = CLAMP (in_x, 0, gt->width - 1);
	in_y = CLAMP (in_y, 0, gt->height - 1);
	break;

	case GST_GT_OFF_EDGES_PIXELS_WRAP:
	in_x = gst_gm_mod_float (in_x, gt->width);
	in_y = gst_gm_mod_float (in_y, gt->height);
	if (in_x < 0)
	in_x += gt->width;
	if (in_y < 0)
	in_y += gt->height;
	break;

	default:
	break;
	}

	{
	gint trunc_x = (gint) in_x;
	gint trunc_y = (gint) in_y;
	/* only set the values if the values are valid */
	if (trunc_x >= 0 && trunc_x < gt->width && trunc_y >= 0 &&
	trunc_y < gt->height) {
	in_offset = trunc_y * gt->row_stride + trunc_x * gt->pixel_stride;

	memcpy (out_data + out_offset, in_data + in_offset, gt->pixel_stride);
	}
	}
	}

	static void
	gst_geometric_transform_before_transform (GstBaseTransform * trans,
	GstBuffer * outbuf)
	{
	GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM_CAST (trans);
	GstClockTime timestamp, stream_time;

	timestamp = GST_BUFFER_TIMESTAMP (outbuf);
	stream_time =
	gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME, timestamp);

	GST_DEBUG_OBJECT (gt, "sync to %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp));

	if (GST_CLOCK_TIME_IS_VALID (stream_time))
	gst_object_sync_values (GST_OBJECT (gt), stream_time);
	}

	static GstFlowReturn
	gst_geometric_transform_transform_frame (GstVideoFilter * vfilter,
	GstVideoFrame * in_frame, GstVideoFrame * out_frame)
	{
	GstGeometricTransform *gt;
	GstGeometricTransformClass *klass;
	gint x, y, i;
	GstFlowReturn ret = GST_FLOW_OK;
	gdouble *ptr;
	guint8 *in_data;
	guint8 *out_data;

	gt = GST_GEOMETRIC_TRANSFORM_CAST (vfilter);
	klass = GST_GEOMETRIC_TRANSFORM_GET_CLASS (gt);

	in_data = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
	out_data = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);

	if (GST_VIDEO_FRAME_FORMAT (out_frame) == GST_VIDEO_FORMAT_AYUV) {
	/* in AYUV black is not just all zeros:
	* 0x10 is black for Y,
	* 0x80 is black for Cr and Cb */
	for (i = 0; i < out_frame->map[0].size; i += 4)
	GST_WRITE_UINT32_BE (out_data + i, 0xff108080);
	} else {
	memset (out_data, 0, out_frame->map[0].size);
	}

	GST_OBJECT_LOCK (gt);
	if (gt->precalc_map) {
	if (gt->needs_remap) {
	if (klass->prepare_func)
	if (!klass->prepare_func (gt)) {
	ret = FALSE;
	goto end;
	}
	gst_geometric_transform_generate_map (gt);
	}
	g_return_val_if_fail (gt->map, GST_FLOW_ERROR);
	ptr = gt->map;
	for (y = 0; y < gt->height; y++) {
	for (x = 0; x < gt->width; x++) {
	/* do the mapping */
	gst_geometric_transform_do_map (gt, in_data, out_data, x, y, ptr[0],
	ptr[1]);
	ptr += 2;
	}
	}
	} else {
	for (y = 0; y < gt->height; y++) {
	for (x = 0; x < gt->width; x++) {
	gdouble in_x, in_y;

	if (klass->map_func (gt, x, y, &in_x, &in_y)) {
	gst_geometric_transform_do_map (gt, in_data, out_data, x, y, in_x,
	in_y);
	} else {
	GST_WARNING_OBJECT (gt, "Failed to do mapping for %d %d", x, y);
	ret = GST_FLOW_ERROR;
	goto end;
	}
	}
	}
	}
	end:
	GST_OBJECT_UNLOCK (gt);
	return ret;
	}

	static void
	gst_geometric_transform_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec)
	{
	GstGeometricTransform *gt;

	gt = GST_GEOMETRIC_TRANSFORM_CAST (object);

	switch (prop_id) {
	case PROP_OFF_EDGE_PIXELS:
	GST_OBJECT_LOCK (gt);
	gt->off_edge_pixels = g_value_get_enum (value);
	GST_OBJECT_UNLOCK (gt);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static void
	gst_geometric_transform_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec)
	{
	GstGeometricTransform *gt;

	gt = GST_GEOMETRIC_TRANSFORM_CAST (object);

	switch (prop_id) {
	case PROP_OFF_EDGE_PIXELS:
	g_value_set_enum (value, gt->off_edge_pixels);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}


	static gboolean
	gst_geometric_transform_stop (GstBaseTransform * trans)
	{
	GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM_CAST (trans);

	GST_INFO_OBJECT (gt, "Deleting transform map");

	gt->width = 0;
	gt->height = 0;

	g_free (gt->map);
	gt->map = NULL;

	return TRUE;
	}

	static void
	gst_geometric_transform_base_init (gpointer g_class)
	{
	GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

	gst_element_class_add_pad_template (element_class,
	gst_static_pad_template_get (&gst_geometric_transform_sink_template));
	gst_element_class_add_pad_template (element_class,
	gst_static_pad_template_get (&gst_geometric_transform_src_template));
	}

	static void
	gst_geometric_transform_class_init (gpointer klass, gpointer class_data)
	{
	GObjectClass *obj_class;
	GstBaseTransformClass *trans_class;
	GstVideoFilterClass *vfilter_class;

	obj_class = (GObjectClass *) klass;
	trans_class = (GstBaseTransformClass *) klass;
	vfilter_class = (GstVideoFilterClass *) klass;

	parent_class = g_type_class_peek_parent (klass);

	obj_class->set_property = gst_geometric_transform_set_property;
	obj_class->get_property = gst_geometric_transform_get_property;

	trans_class->stop = GST_DEBUG_FUNCPTR (gst_geometric_transform_stop);
	trans_class->before_transform =
	GST_DEBUG_FUNCPTR (gst_geometric_transform_before_transform);

	vfilter_class->set_info =
	GST_DEBUG_FUNCPTR (gst_geometric_transform_set_info);
	vfilter_class->transform_frame =
	GST_DEBUG_FUNCPTR (gst_geometric_transform_transform_frame);

	g_object_class_install_property (obj_class, PROP_OFF_EDGE_PIXELS,
	g_param_spec_enum ("off-edge-pixels", "Off edge pixels",
	"What to do with off edge pixels",
	GST_GT_OFF_EDGES_PIXELS_METHOD_TYPE, DEFAULT_OFF_EDGE_PIXELS,
	GST_PARAM_CONTROLLABLE \| G_PARAM_READWRITE \| G_PARAM_STATIC_STRINGS));
	}

	static void
	gst_geometric_transform_init (GTypeInstance * instance, gpointer g_class)
	{
	GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM_CAST (instance);

	gt->off_edge_pixels = DEFAULT_OFF_EDGE_PIXELS;
	gt->precalc_map = TRUE;
	gt->needs_remap = TRUE;
	}

	GType
	gst_geometric_transform_get_type (void)
	{
	static GType geometric_transform_type = 0;

	if (!geometric_transform_type) {
	static const GTypeInfo geometric_transform_info = {
	sizeof (GstGeometricTransformClass),
	gst_geometric_transform_base_init,
	NULL,
	gst_geometric_transform_class_init,
	NULL,
	NULL,
	sizeof (GstGeometricTransform),
	0,
	gst_geometric_transform_init,
	};

	geometric_transform_type = g_type_register_static (GST_TYPE_VIDEO_FILTER,
	"GstGeometricTransform", &geometric_transform_info,
	G_TYPE_FLAG_ABSTRACT);

	GST_DEBUG_CATEGORY_INIT (geometric_transform_debug, "geometrictransform", 0,
	"Base class for geometric transform elements");
	}
	return geometric_transform_type;
	}

	/*
	* Must be called with the object lock
	*/
	void
	gst_geometric_transform_set_need_remap (GstGeometricTransform * gt)
	{
	gt->needs_remap = TRUE;
	}