gstreamer/gst/effectv/gstedge.c
2012-04-10 00:51:41 +01:00

254 lines
7 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* EffecTV:
* Copyright (C) 2001-2002 FUKUCHI Kentarou
*
* EdgeTV - detects edge and display it in good old computer way
*
* EffecTV is free software. 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.
*/
/**
* SECTION:element-edgetv
*
* EdgeTV detects edges and display it in good old low resolution
* computer way.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! edgetv ! videoconvert ! autovideosink
* ]| This pipeline shows the effect of edgetv on a test stream.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstedge.h"
#define gst_edgetv_parent_class parent_class
G_DEFINE_TYPE (GstEdgeTV, gst_edgetv, GST_TYPE_VIDEO_FILTER);
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ BGRx, RGBx }")
#else
#define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ xBGR, xRGB }")
#endif
static GstStaticPadTemplate gst_edgetv_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (CAPS_STR)
);
static GstStaticPadTemplate gst_edgetv_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (CAPS_STR)
);
static gboolean
gst_edgetv_set_info (GstVideoFilter * filter, GstCaps * incaps,
GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
{
GstEdgeTV *edgetv = GST_EDGETV (filter);
guint map_size;
gint width, height;
width = GST_VIDEO_INFO_WIDTH (in_info);
height = GST_VIDEO_INFO_HEIGHT (in_info);
edgetv->map_width = width / 4;
edgetv->map_height = height / 4;
edgetv->video_width_margin = width % 4;
map_size = edgetv->map_width * edgetv->map_height * sizeof (guint32) * 2;
g_free (edgetv->map);
edgetv->map = (guint32 *) g_malloc0 (map_size);
return TRUE;
}
static GstFlowReturn
gst_edgetv_transform_frame (GstVideoFilter * vfilter, GstVideoFrame * in_frame,
GstVideoFrame * out_frame)
{
GstEdgeTV *filter = GST_EDGETV (vfilter);
gint x, y, r, g, b;
guint32 *src, *dest;
guint32 p, q;
guint32 v0, v1, v2, v3;
gint width, map_height, map_width;
gint video_width_margin;
guint32 *map;
GstFlowReturn ret = GST_FLOW_OK;
map = filter->map;
map_height = filter->map_height;
map_width = filter->map_width;
video_width_margin = filter->video_width_margin;
src = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
dest = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);
width = GST_VIDEO_FRAME_WIDTH (in_frame);
src += width * 4 + 4;
dest += width * 4 + 4;
for (y = 1; y < map_height - 1; y++) {
for (x = 1; x < map_width - 1; x++) {
p = *src;
q = *(src - 4);
/* difference between the current pixel and left neighbor. */
r = ((p & 0xff0000) - (q & 0xff0000)) >> 16;
g = ((p & 0xff00) - (q & 0xff00)) >> 8;
b = (p & 0xff) - (q & 0xff);
r *= r;
g *= g;
b *= b;
r = r >> 5; /* To lack the lower bit for saturated addition, */
g = g >> 5; /* devide the value with 32, instead of 16. It is */
b = b >> 4; /* same as `v2 &= 0xfefeff' */
if (r > 127)
r = 127;
if (g > 127)
g = 127;
if (b > 255)
b = 255;
v2 = (r << 17) | (g << 9) | b;
/* difference between the current pixel and upper neighbor. */
q = *(src - width * 4);
r = ((p & 0xff0000) - (q & 0xff0000)) >> 16;
g = ((p & 0xff00) - (q & 0xff00)) >> 8;
b = (p & 0xff) - (q & 0xff);
r *= r;
g *= g;
b *= b;
r = r >> 5;
g = g >> 5;
b = b >> 4;
if (r > 127)
r = 127;
if (g > 127)
g = 127;
if (b > 255)
b = 255;
v3 = (r << 17) | (g << 9) | b;
v0 = map[(y - 1) * map_width * 2 + x * 2];
v1 = map[y * map_width * 2 + (x - 1) * 2 + 1];
map[y * map_width * 2 + x * 2] = v2;
map[y * map_width * 2 + x * 2 + 1] = v3;
r = v0 + v1;
g = r & 0x01010100;
dest[0] = r | (g - (g >> 8));
r = v0 + v3;
g = r & 0x01010100;
dest[1] = r | (g - (g >> 8));
dest[2] = v3;
dest[3] = v3;
r = v2 + v1;
g = r & 0x01010100;
dest[width] = r | (g - (g >> 8));
r = v2 + v3;
g = r & 0x01010100;
dest[width + 1] = r | (g - (g >> 8));
dest[width + 2] = v3;
dest[width + 3] = v3;
dest[width * 2] = v2;
dest[width * 2 + 1] = v2;
dest[width * 2 + 2] = 0;
dest[width * 2 + 3] = 0;
dest[width * 3] = v2;
dest[width * 3 + 1] = v2;
dest[width * 3 + 2] = 0;
dest[width * 3 + 3] = 0;
src += 4;
dest += 4;
}
src += width * 3 + 8 + video_width_margin;
dest += width * 3 + 8 + video_width_margin;
}
return ret;
}
static gboolean
gst_edgetv_start (GstBaseTransform * trans)
{
GstEdgeTV *edgetv = GST_EDGETV (trans);
if (edgetv->map)
memset (edgetv->map, 0,
edgetv->map_width * edgetv->map_height * sizeof (guint32) * 2);
return TRUE;
}
static void
gst_edgetv_finalize (GObject * object)
{
GstEdgeTV *edgetv = GST_EDGETV (object);
g_free (edgetv->map);
edgetv->map = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_edgetv_class_init (GstEdgeTVClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
GstVideoFilterClass *vfilter_class = (GstVideoFilterClass *) klass;
gobject_class->finalize = gst_edgetv_finalize;
gst_element_class_set_static_metadata (gstelement_class, "EdgeTV effect",
"Filter/Effect/Video",
"Apply edge detect on video", "Wim Taymans <wim.taymans@chello.be>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_edgetv_sink_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_edgetv_src_template));
trans_class->start = GST_DEBUG_FUNCPTR (gst_edgetv_start);
vfilter_class->set_info = GST_DEBUG_FUNCPTR (gst_edgetv_set_info);
vfilter_class->transform_frame =
GST_DEBUG_FUNCPTR (gst_edgetv_transform_frame);
}
static void
gst_edgetv_init (GstEdgeTV * edgetv)
{
}