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256 lines
7 KiB
C
256 lines
7 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
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*
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* EffecTV:
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* Copyright (C) 2001-2002 FUKUCHI Kentarou
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*
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* EdgeTV - detects edge and display it in good old computer way
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*
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* EffecTV is free software. This library is free software;
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* 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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-edgetv
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* @title: edgetv
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*
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* EdgeTV detects edges and display it in good old low resolution
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* computer way.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v videotestsrc ! edgetv ! videoconvert ! autovideosink
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* ]| This pipeline shows the effect of edgetv on a test stream.
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*
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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 <string.h>
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#include "gstedge.h"
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#include "gsteffectv.h"
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#define gst_edgetv_parent_class parent_class
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G_DEFINE_TYPE (GstEdgeTV, gst_edgetv, GST_TYPE_VIDEO_FILTER);
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GST_ELEMENT_REGISTER_DEFINE (edgetv, "edgetv", GST_RANK_NONE, GST_TYPE_EDGETV);
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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#define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ BGRx, RGBx }")
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#else
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#define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ xBGR, xRGB }")
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#endif
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static GstStaticPadTemplate gst_edgetv_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 (CAPS_STR)
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);
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static GstStaticPadTemplate gst_edgetv_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 (CAPS_STR)
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);
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static gboolean
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gst_edgetv_set_info (GstVideoFilter * filter, GstCaps * incaps,
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GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
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{
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GstEdgeTV *edgetv = GST_EDGETV (filter);
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guint map_size;
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gint width, height;
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width = GST_VIDEO_INFO_WIDTH (in_info);
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height = GST_VIDEO_INFO_HEIGHT (in_info);
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edgetv->map_width = width / 4;
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edgetv->map_height = height / 4;
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edgetv->video_width_margin = width % 4;
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map_size = edgetv->map_width * edgetv->map_height * sizeof (guint32) * 2;
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g_free (edgetv->map);
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edgetv->map = (guint32 *) g_malloc0 (map_size);
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return TRUE;
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}
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static GstFlowReturn
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gst_edgetv_transform_frame (GstVideoFilter * vfilter, GstVideoFrame * in_frame,
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GstVideoFrame * out_frame)
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{
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GstEdgeTV *filter = GST_EDGETV (vfilter);
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gint x, y, r, g, b;
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guint32 *src, *dest;
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guint32 p, q;
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guint32 v0, v1, v2, v3;
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gint width, map_height, map_width;
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gint video_width_margin;
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guint32 *map;
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GstFlowReturn ret = GST_FLOW_OK;
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map = filter->map;
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map_height = filter->map_height;
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map_width = filter->map_width;
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video_width_margin = filter->video_width_margin;
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src = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
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dest = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);
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width = GST_VIDEO_FRAME_WIDTH (in_frame);
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src += width * 4 + 4;
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dest += width * 4 + 4;
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for (y = 1; y < map_height - 1; y++) {
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for (x = 1; x < map_width - 1; x++) {
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p = *src;
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q = *(src - 4);
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/* difference between the current pixel and left neighbor. */
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r = ((p & 0xff0000) - (q & 0xff0000)) >> 16;
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g = ((p & 0xff00) - (q & 0xff00)) >> 8;
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b = (p & 0xff) - (q & 0xff);
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r *= r;
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g *= g;
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b *= b;
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r = r >> 5; /* To lack the lower bit for saturated addition, */
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g = g >> 5; /* divide the value with 32, instead of 16. It is */
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b = b >> 4; /* same as `v2 &= 0xfefeff' */
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if (r > 127)
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r = 127;
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if (g > 127)
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g = 127;
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if (b > 255)
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b = 255;
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v2 = (r << 17) | (g << 9) | b;
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/* difference between the current pixel and upper neighbor. */
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q = *(src - width * 4);
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r = ((p & 0xff0000) - (q & 0xff0000)) >> 16;
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g = ((p & 0xff00) - (q & 0xff00)) >> 8;
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b = (p & 0xff) - (q & 0xff);
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r *= r;
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g *= g;
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b *= b;
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r = r >> 5;
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g = g >> 5;
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b = b >> 4;
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if (r > 127)
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r = 127;
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if (g > 127)
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g = 127;
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if (b > 255)
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b = 255;
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v3 = (r << 17) | (g << 9) | b;
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v0 = map[(y - 1) * map_width * 2 + x * 2];
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v1 = map[y * map_width * 2 + (x - 1) * 2 + 1];
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map[y * map_width * 2 + x * 2] = v2;
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map[y * map_width * 2 + x * 2 + 1] = v3;
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r = v0 + v1;
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g = r & 0x01010100;
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dest[0] = r | (g - (g >> 8));
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r = v0 + v3;
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g = r & 0x01010100;
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dest[1] = r | (g - (g >> 8));
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dest[2] = v3;
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dest[3] = v3;
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r = v2 + v1;
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g = r & 0x01010100;
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dest[width] = r | (g - (g >> 8));
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r = v2 + v3;
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g = r & 0x01010100;
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dest[width + 1] = r | (g - (g >> 8));
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dest[width + 2] = v3;
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dest[width + 3] = v3;
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dest[width * 2] = v2;
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dest[width * 2 + 1] = v2;
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dest[width * 2 + 2] = 0;
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dest[width * 2 + 3] = 0;
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dest[width * 3] = v2;
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dest[width * 3 + 1] = v2;
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dest[width * 3 + 2] = 0;
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dest[width * 3 + 3] = 0;
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src += 4;
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dest += 4;
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}
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src += width * 3 + 8 + video_width_margin;
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dest += width * 3 + 8 + video_width_margin;
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}
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return ret;
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}
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static gboolean
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gst_edgetv_start (GstBaseTransform * trans)
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{
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GstEdgeTV *edgetv = GST_EDGETV (trans);
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if (edgetv->map)
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memset (edgetv->map, 0,
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edgetv->map_width * edgetv->map_height * sizeof (guint32) * 2);
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return TRUE;
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}
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static void
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gst_edgetv_finalize (GObject * object)
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{
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GstEdgeTV *edgetv = GST_EDGETV (object);
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g_free (edgetv->map);
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edgetv->map = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_edgetv_class_init (GstEdgeTVClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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GstElementClass *gstelement_class = (GstElementClass *) klass;
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GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
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GstVideoFilterClass *vfilter_class = (GstVideoFilterClass *) klass;
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gobject_class->finalize = gst_edgetv_finalize;
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gst_element_class_set_static_metadata (gstelement_class, "EdgeTV effect",
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"Filter/Effect/Video",
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"Apply edge detect on video", "Wim Taymans <wim.taymans@chello.be>");
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_edgetv_sink_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_edgetv_src_template);
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trans_class->start = GST_DEBUG_FUNCPTR (gst_edgetv_start);
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vfilter_class->set_info = GST_DEBUG_FUNCPTR (gst_edgetv_set_info);
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vfilter_class->transform_frame =
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GST_DEBUG_FUNCPTR (gst_edgetv_transform_frame);
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}
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static void
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gst_edgetv_init (GstEdgeTV * edgetv)
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{
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}
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