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b7660b122c
Adds a new plugin that has elements that perform geometric transformations to images. By geometric transformations I mean that the operations are functions that given the output pixel position, get the pixel position in the input image. This pixel is then copied from input to output. The gstgeometrictransform baseclass makes it easy to write such elements. It boils down to write the mapping function and exposing properties Already added the first of the elements, 'pinch'. It's a common effect in image editors, like gimp (distort -> pinch)
166 lines
4.7 KiB
C
166 lines
4.7 KiB
C
/* GStreamer
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* Copyright (C) <2010> Thiago Santos <thiago.sousa.santos@collabora.co.uk>
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstgeometrictransform.h"
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#include <string.h>
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GST_DEBUG_CATEGORY_STATIC (geometric_transform_debug);
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#define GST_CAT_DEFAULT geometric_transform_debug
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static GstStaticPadTemplate gst_geometric_transform_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB)
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);
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static GstStaticPadTemplate gst_geometric_transform_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB)
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);
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static GstVideoFilterClass *parent_class = NULL;
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static gboolean
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gst_geometric_transform_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
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GstCaps * outcaps)
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{
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GstGeometricTransform *vf;
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vf = GST_GEOMETRIC_TRANSFORM (btrans);
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return gst_video_format_parse_caps (incaps, &vf->format, &vf->width,
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&vf->height);
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}
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static void
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gst_geometric_transform_do_map (GstGeometricTransform * gt, GstBuffer * inbuf,
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GstBuffer * outbuf, gint x, gint y, gdouble out_x, gdouble out_y)
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{
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gint trunc_x = (gint) out_x;
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gint trunc_y = (gint) out_y;
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gint in_offset;
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gint out_offset;
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/* NOP */
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out_offset = (y * gt->width + x) * 3;
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in_offset = (trunc_y * gt->width + trunc_x) * 3;
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memcpy (GST_BUFFER_DATA (outbuf) + out_offset,
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GST_BUFFER_DATA (inbuf) + in_offset, 3);
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}
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static GstFlowReturn
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gst_geometric_transform_transform (GstBaseTransform * trans, GstBuffer * buf,
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GstBuffer * outbuf)
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{
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GstGeometricTransform *gt;
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GstGeometricTransformClass *klass;
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gint x, y;
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gdouble out_x, out_y;
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guint8 *data;
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GstFlowReturn ret = GST_FLOW_OK;
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gt = GST_GEOMETRIC_TRANSFORM (trans);
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klass = GST_GEOMETRIC_TRANSFORM_GET_CLASS (gt);
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/* subclass must have defined the map_func */
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g_return_val_if_fail (klass->map_func, GST_FLOW_ERROR);
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data = GST_BUFFER_DATA (buf);
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for (x = 0; x < gt->width; x++) {
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for (y = 0; y < gt->height; y++) {
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if (!klass->map_func (gt, x, y, &out_x, &out_y)) {
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/* child should have warned */
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ret = GST_FLOW_ERROR;
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goto end;
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}
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/* do the mapping */
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gst_geometric_transform_do_map (gt, buf, outbuf, x, y, out_x, out_y);
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}
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}
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end:
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return ret;
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}
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static void
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gst_geometric_transform_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_geometric_transform_sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_geometric_transform_src_template));
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}
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static void
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gst_geometric_transform_class_init (gpointer klass, gpointer class_data)
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{
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GstBaseTransformClass *trans_class;
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trans_class = (GstBaseTransformClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_geometric_transform_set_caps);
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trans_class->transform =
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GST_DEBUG_FUNCPTR (gst_geometric_transform_transform);
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}
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static void
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gst_geometric_transform_init (GTypeInstance * instance, gpointer g_class)
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{
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}
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GType
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gst_geometric_transform_get_type (void)
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{
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static GType geometric_transform_type = 0;
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if (!geometric_transform_type) {
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static const GTypeInfo geometric_transform_info = {
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sizeof (GstGeometricTransformClass),
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gst_geometric_transform_base_init,
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NULL,
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gst_geometric_transform_class_init,
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NULL,
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NULL,
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sizeof (GstGeometricTransform),
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0,
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gst_geometric_transform_init,
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};
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geometric_transform_type = g_type_register_static (GST_TYPE_VIDEO_FILTER,
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"GstGeometricTransform", &geometric_transform_info,
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G_TYPE_FLAG_ABSTRACT);
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GST_DEBUG_CATEGORY_INIT (geometric_transform_debug, "geometrictransform", 0,
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"Base class for geometric transform elements");
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}
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return geometric_transform_type;
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}
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