/* 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 ! ffmpegcolorspace ! 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" #include <gst/video/video.h> GST_BOILERPLATE (GstEdgeTV, gst_edgetv, GstVideoFilter, GST_TYPE_VIDEO_FILTER); #if G_BYTE_ORDER == G_LITTLE_ENDIAN #define CAPS_STR GST_VIDEO_CAPS_BGRx ";" GST_VIDEO_CAPS_RGBx #else #define CAPS_STR GST_VIDEO_CAPS_xBGR ";" GST_VIDEO_CAPS_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_caps (GstBaseTransform * btrans, GstCaps * incaps, GstCaps * outcaps) { GstEdgeTV *edgetv = GST_EDGETV (btrans); GstStructure *structure; gboolean ret = FALSE; structure = gst_caps_get_structure (incaps, 0); if (gst_structure_get_int (structure, "width", &edgetv->width) && gst_structure_get_int (structure, "height", &edgetv->height)) { guint map_size; edgetv->map_width = edgetv->width / 4; edgetv->map_height = edgetv->height / 4; edgetv->video_width_margin = edgetv->width % 4; map_size = edgetv->map_width * edgetv->map_height * sizeof (guint32) * 2; g_free (edgetv->map); edgetv->map = (guint32 *) g_malloc0 (map_size); ret = TRUE; } return ret; } static GstFlowReturn gst_edgetv_transform (GstBaseTransform * trans, GstBuffer * in, GstBuffer * out) { GstEdgeTV *filter = GST_EDGETV (trans); gint x, y, r, g, b; guint32 *src, *dest; guint32 p, q; guint32 v0, v1, v2, v3; GstFlowReturn ret = GST_FLOW_OK; src = (guint32 *) GST_BUFFER_DATA (in); dest = (guint32 *) GST_BUFFER_DATA (out); src += filter->width * 4 + 4; dest += filter->width * 4 + 4; for (y = 1; y < filter->map_height - 1; y++) { for (x = 1; x < filter->map_width - 1; x++) { p = *src; q = *(src - 4); /* difference between the current pixel and right 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 - filter->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 = filter->map[(y - 1) * filter->map_width * 2 + x * 2]; v1 = filter->map[y * filter->map_width * 2 + (x - 1) * 2 + 1]; filter->map[y * filter->map_width * 2 + x * 2] = v2; filter->map[y * filter->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[filter->width] = r | (g - (g >> 8)); r = v2 + v3; g = r & 0x01010100; dest[filter->width + 1] = r | (g - (g >> 8)); dest[filter->width + 2] = v3; dest[filter->width + 3] = v3; dest[filter->width * 2] = v2; dest[filter->width * 2 + 1] = v2; dest[filter->width * 3] = v2; dest[filter->width * 3 + 1] = v2; src += 4; dest += 4; } src += filter->width * 3 + 8 + filter->video_width_margin; dest += filter->width * 3 + 8 + filter->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_base_init (gpointer g_class) { GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details_simple (element_class, "EdgeTV effect", "Filter/Effect/Video", "Apply edge detect on video", "Wim Taymans <wim.taymans@chello.be>"); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_edgetv_sink_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_edgetv_src_template)); } static void gst_edgetv_class_init (GstEdgeTVClass * klass) { GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass; GObjectClass *gobject_class = (GObjectClass *) klass; gobject_class->finalize = gst_edgetv_finalize; trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_edgetv_set_caps); trans_class->transform = GST_DEBUG_FUNCPTR (gst_edgetv_transform); trans_class->start = GST_DEBUG_FUNCPTR (gst_edgetv_start); } static void gst_edgetv_init (GstEdgeTV * edgetv, GstEdgeTVClass * klass) { }