gstreamer/gst/effectv/gstrev.c

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/* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <string.h>
#include <gst/gst.h>
#include <gstvideofilter.h>
#define GST_TYPE_REVTV \
(gst_revtv_get_type())
#define GST_REVTV(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_REVTV,GstRevTV))
#define GST_REVTV_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_REVTV,GstRevTVClass))
#define GST_IS_REVTV(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_REVTV))
#define GST_IS_REVTV_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_REVTV))
#define THE_COLOR 0xffffffff
typedef struct _GstRevTV GstRevTV;
typedef struct _GstRevTVClass GstRevTVClass;
struct _GstRevTV
{
GstVideofilter videofilter;
gint width, height;
gint vgrabtime;
gint vgrab;
gint linespace;
gint vscale;
};
struct _GstRevTVClass
{
GstVideofilterClass parent_class;
void (*reset) (GstElement * element);
};
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_DELAY,
ARG_LINESPACE,
ARG_GAIN
};
static void gst_revtv_base_init (gpointer g_class);
static void gst_revtv_class_init (gpointer g_class, gpointer class_data);
static void gst_revtv_init (GTypeInstance * instance, gpointer g_class);
static void gst_revtv_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_revtv_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_revtv_setup (GstVideofilter * videofilter);
static void gst_revtv_rgb32 (GstVideofilter * videofilter, void *d, void *s);
/* static guint gst_revtv_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_revtv_get_type (void)
{
static GType revtv_type = 0;
if (!revtv_type) {
static const GTypeInfo revtv_info = {
sizeof (GstRevTVClass),
gst_revtv_base_init,
NULL,
(GClassInitFunc) gst_revtv_class_init,
NULL,
NULL,
sizeof (GstRevTV),
0,
(GInstanceInitFunc) gst_revtv_init,
};
revtv_type =
g_type_register_static (GST_TYPE_VIDEOFILTER, "GstRevTV", &revtv_info,
0);
}
return revtv_type;
}
static GstVideofilterFormat gst_revtv_formats[] = {
{"RGB ", 32, gst_revtv_rgb32, 24, G_BIG_ENDIAN, 0x0000ff00, 0x00ff0000,
0xff000000}
};
static void
gst_revtv_base_init (gpointer g_class)
{
/* elementfactory information */
static GstElementDetails gst_revtv_details = GST_ELEMENT_DETAILS ("RevTV",
"Filter/Effect/Video",
"A video waveform monitor for each line of video processed",
"Wim Taymans <wim.taymans@chello.be>");
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstVideofilterClass *videofilter_class = GST_VIDEOFILTER_CLASS (g_class);
int i;
gst_element_class_set_details (element_class, &gst_revtv_details);
for (i = 0; i < G_N_ELEMENTS (gst_revtv_formats); i++) {
gst_videofilter_class_add_format (videofilter_class, gst_revtv_formats + i);
}
gst_videofilter_class_add_pad_templates (GST_VIDEOFILTER_CLASS (g_class));
}
static void
gst_revtv_class_init (gpointer klass, gpointer class_data)
{
GObjectClass *gobject_class;
GstVideofilterClass *videofilter_class;
gobject_class = G_OBJECT_CLASS (klass);
videofilter_class = GST_VIDEOFILTER_CLASS (klass);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DELAY,
g_param_spec_int ("delay", "Delay", "Delay in frames between updates",
1, 100, 1, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LINESPACE,
g_param_spec_int ("linespace", "Linespace", "Control line spacing",
1, 100, 6, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_GAIN,
g_param_spec_int ("gain", "Gain", "Control gain",
1, 200, 50, G_PARAM_READWRITE));
gobject_class->set_property = gst_revtv_set_property;
gobject_class->get_property = gst_revtv_get_property;
videofilter_class->setup = gst_revtv_setup;
}
static void
gst_revtv_init (GTypeInstance * instance, gpointer g_class)
{
GstRevTV *restv = GST_REVTV (instance);
restv->vgrabtime = 1;
restv->vgrab = 0;
restv->linespace = 6;
restv->vscale = 50;
}
static void
gst_revtv_setup (GstVideofilter * videofilter)
{
GstRevTV *revtv;
g_return_if_fail (GST_IS_REVTV (videofilter));
revtv = GST_REVTV (videofilter);
revtv->width = gst_videofilter_get_input_width (videofilter);
revtv->height = gst_videofilter_get_input_height (videofilter);
}
static void
gst_revtv_rgb32 (GstVideofilter * videofilter, void *d, void *s)
{
GstRevTV *filter;
guint32 *src, *dest;
gint width, height;
guint32 *nsrc;
gint y, x, R, G, B, yval;
filter = GST_REVTV (videofilter);
src = (guint32 *) s;
dest = (guint32 *) d;
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;
}
}
}
}
static void
gst_revtv_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstRevTV *filter;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_REVTV (object));
filter = GST_REVTV (object);
switch (prop_id) {
case ARG_DELAY:
filter->vgrabtime = g_value_get_int (value);
break;
case ARG_LINESPACE:
filter->linespace = g_value_get_int (value);
break;
case ARG_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;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_REVTV (object));
filter = GST_REVTV (object);
switch (prop_id) {
case ARG_DELAY:
g_value_set_int (value, filter->vgrabtime);
break;
case ARG_LINESPACE:
g_value_set_int (value, filter->linespace);
break;
case ARG_GAIN:
g_value_set_int (value, filter->vscale);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}