gstreamer/gst/effectv/gstrev.c

242 lines
6.7 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* EffecTV:
* Copyright (C) 2001 FUKUCHI Kentarou
*
* EffecTV - Realtime Digital Video Effector
* Copyright (C) 2001 FUKUCHI Kentarou
*
* revTV based on Rutt-Etra Video Synthesizer 1974?
* (c)2002 Ed Tannenbaum
*
* This effect acts like a waveform monitor on each line.
* It was originally done by deflecting the electron beam on a monitor using
* additional electromagnets on the yoke of a b/w CRT.
* Here it is emulated digitally.
* Experimaental tapes were made with this system by Bill and
* Louise Etra and Woody and Steina Vasulka
* The line spacing can be controlled using the 1 and 2 Keys.
* The gain is controlled using the 3 and 4 keys.
* The update rate is controlled using the 0 and - keys.
* 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-quarktv
*
* RevTV acts like a video waveform monitor for each line of video
* processed. This creates a pseudo 3D effect based on the brightness
* of the video along each line.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! revtv ! ffmpegcolorspace ! autovideosink
* ]| This pipeline shows the effect of revtv on a test stream.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <string.h>
#include "gstrev.h"
#include <gst/video/video.h>
#define THE_COLOR 0xffffffff
enum
{
PROP_0,
PROP_DELAY,
PROP_LINESPACE,
PROP_GAIN
};
GST_BOILERPLATE (GstRevTV, gst_revtv, GstVideoFilter, GST_TYPE_VIDEO_FILTER);
static GstStaticPadTemplate gst_revtv_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_BGRx)
);
static GstStaticPadTemplate gst_revtv_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_BGRx)
);
static gboolean
gst_revtv_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstRevTV *filter = GST_REVTV (btrans);
GstStructure *structure;
gboolean ret = FALSE;
structure = gst_caps_get_structure (incaps, 0);
if (gst_structure_get_int (structure, "width", &filter->width) &&
gst_structure_get_int (structure, "height", &filter->height)) {
ret = TRUE;
}
return ret;
}
static GstFlowReturn
gst_revtv_transform (GstBaseTransform * trans, GstBuffer * in, GstBuffer * out)
{
GstRevTV *filter = GST_REVTV (trans);
guint32 *src, *dest;
gint width, height;
guint32 *nsrc;
gint y, x, R, G, B, yval;
GstFlowReturn ret = GST_FLOW_OK;
src = (guint32 *) GST_BUFFER_DATA (in);
dest = (guint32 *) GST_BUFFER_DATA (out);
width = filter->width;
height = filter->height;
/* Clear everything to black */
memset (dest, 0, width * height * sizeof (guint32));
/* draw the offset lines */
for (y = 0; y < height; y += filter->linespace) {
for (x = 0; x <= width; x++) {
nsrc = src + (y * width) + x;
/* Calc Y Value for curpix */
R = ((*nsrc) & 0xff0000) >> (16 - 1);
G = ((*nsrc) & 0xff00) >> (8 - 2);
B = (*nsrc) & 0xff;
yval = y - ((short) (R + G + B) / filter->vscale);
if (yval > 0) {
dest[x + (yval * width)] = THE_COLOR;
}
}
}
return ret;
}
static void
gst_revtv_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstRevTV *filter = GST_REVTV (object);
switch (prop_id) {
case PROP_DELAY:
filter->vgrabtime = g_value_get_int (value);
break;
case PROP_LINESPACE:
filter->linespace = g_value_get_int (value);
break;
case PROP_GAIN:
filter->vscale = g_value_get_int (value);
break;
default:
break;
}
}
static void
gst_revtv_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstRevTV *filter = GST_REVTV (object);
switch (prop_id) {
case PROP_DELAY:
g_value_set_int (value, filter->vgrabtime);
break;
case PROP_LINESPACE:
g_value_set_int (value, filter->linespace);
break;
case PROP_GAIN:
g_value_set_int (value, filter->vscale);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_revtv_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "RevTV effect",
"Filter/Effect/Video",
"A video waveform monitor for each line of video processed",
"Wim Taymans <wim.taymans@chello.be>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_revtv_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_revtv_src_template));
}
static void
gst_revtv_class_init (GstRevTVClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
gobject_class->set_property = gst_revtv_set_property;
gobject_class->get_property = gst_revtv_get_property;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DELAY,
g_param_spec_int ("delay", "Delay", "Delay in frames between updates",
1, 100, 1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_LINESPACE,
g_param_spec_int ("linespace", "Linespace", "Control line spacing",
1, 100, 6, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_GAIN,
g_param_spec_int ("gain", "Gain", "Control gain",
1, 200, 50, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_revtv_set_caps);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_revtv_transform);
}
static void
gst_revtv_init (GstRevTV * restv, GstRevTVClass * klass)
{
restv->vgrabtime = 1;
restv->vgrab = 0;
restv->linespace = 6;
restv->vscale = 50;
}