gstreamer/gst/effectv/gstshagadelic.c

270 lines
7.2 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* EffecTV:
* Copyright (C) 2001 FUKUCHI Kentarou
*
* Inspired by Adrian Likin's script for the GIMP.
* 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-shagadelictv
*
* Oh behave, ShagedelicTV makes images shagadelic!
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! shagadelictv ! ffmpegcolorspace ! autovideosink
* ]| This pipeline shows the effect of shagadelictv on a test stream.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <string.h>
#include "gstshagadelic.h"
#include "gsteffectv.h"
#include <gst/video/video.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
GST_BOILERPLATE (GstShagadelicTV, gst_shagadelictv, GstVideoFilter,
GST_TYPE_VIDEO_FILTER);
static void gst_shagadelic_initialize (GstShagadelicTV * filter);
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define CAPS_STR GST_VIDEO_CAPS_BGRx
#else
#define CAPS_STR GST_VIDEO_CAPS_xRGB
#endif
static GstStaticPadTemplate gst_shagadelictv_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (CAPS_STR)
);
static GstStaticPadTemplate gst_shagadelictv_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (CAPS_STR)
);
static gboolean
gst_shagadelictv_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstShagadelicTV *filter = GST_SHAGADELICTV (btrans);
GstStructure *structure;
gboolean ret = FALSE;
structure = gst_caps_get_structure (incaps, 0);
GST_OBJECT_LOCK (filter);
if (gst_structure_get_int (structure, "width", &filter->width) &&
gst_structure_get_int (structure, "height", &filter->height)) {
gint area = filter->width * filter->height;
g_free (filter->ripple);
g_free (filter->spiral);
filter->ripple = (guint8 *) g_malloc (area * 4);
filter->spiral = (guint8 *) g_malloc (area);
gst_shagadelic_initialize (filter);
ret = TRUE;
}
GST_OBJECT_UNLOCK (filter);
return ret;
}
static void
gst_shagadelic_initialize (GstShagadelicTV * filter)
{
int i, x, y;
#ifdef PS2
float xx, yy;
#else
double xx, yy;
#endif
i = 0;
for (y = 0; y < filter->height * 2; y++) {
yy = y - filter->height;
yy *= yy;
for (x = 0; x < filter->width * 2; x++) {
xx = x - filter->width;
#ifdef PS2
filter->ripple[i++] = ((unsigned int) (sqrtf (xx * xx + yy) * 8)) & 255;
#else
filter->ripple[i++] = ((unsigned int) (sqrt (xx * xx + yy) * 8)) & 255;
#endif
}
}
i = 0;
for (y = 0; y < filter->height; y++) {
yy = y - filter->height / 2;
for (x = 0; x < filter->width; x++) {
xx = x - filter->width / 2;
#ifdef PS2
filter->spiral[i++] = ((unsigned int)
((atan2f (xx,
yy) / ((float) M_PI) * 256 * 9) + (sqrtf (xx * xx +
yy * yy) * 5))) & 255;
#else
filter->spiral[i++] = ((unsigned int)
((atan2 (xx, yy) / M_PI * 256 * 9) + (sqrt (xx * xx +
yy * yy) * 5))) & 255;
#endif
/* Here is another Swinger!
* ((atan2(xx, yy)/M_PI*256) + (sqrt(xx*xx+yy*yy)*10))&255;
*/
}
}
filter->rx = fastrand () % filter->width;
filter->ry = fastrand () % filter->height;
filter->bx = fastrand () % filter->width;
filter->by = fastrand () % filter->height;
filter->rvx = -2;
filter->rvy = -2;
filter->bvx = 2;
filter->bvy = 2;
filter->phase = 0;
}
static GstFlowReturn
gst_shagadelictv_transform (GstBaseTransform * trans, GstBuffer * in,
GstBuffer * out)
{
GstShagadelicTV *filter = GST_SHAGADELICTV (trans);
guint32 *src, *dest;
gint x, y;
guint32 v;
guint8 r, g, b;
gint width, height;
GstFlowReturn ret = GST_FLOW_OK;
src = (guint32 *) GST_BUFFER_DATA (in);
dest = (guint32 *) GST_BUFFER_DATA (out);
GST_OBJECT_LOCK (filter);
width = filter->width;
height = filter->height;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
v = *src++ | 0x1010100;
v = (v - 0x707060) & 0x1010100;
v -= v >> 8;
/* Try another Babe!
* v = *src++;
* *dest++ = v & ((r<<16)|(g<<8)|b);
*/
r = ((gint8) (filter->ripple[(filter->ry + y) * width * 2 + filter->rx +
x] + filter->phase * 2)) >> 7;
g = ((gint8) (filter->spiral[y * width + x] + filter->phase * 3)) >> 7;
b = ((gint8) (filter->ripple[(filter->by + y) * width * 2 + filter->bx +
x] - filter->phase)) >> 7;
*dest++ = v & ((r << 16) | (g << 8) | b);
}
}
filter->phase -= 8;
if ((filter->rx + filter->rvx) < 0 || (filter->rx + filter->rvx) >= width)
filter->rvx = -filter->rvx;
if ((filter->ry + filter->rvy) < 0 || (filter->ry + filter->rvy) >= height)
filter->rvy = -filter->rvy;
if ((filter->bx + filter->bvx) < 0 || (filter->bx + filter->bvx) >= width)
filter->bvx = -filter->bvx;
if ((filter->by + filter->bvy) < 0 || (filter->by + filter->bvy) >= height)
filter->bvy = -filter->bvy;
filter->rx += filter->rvx;
filter->ry += filter->rvy;
filter->bx += filter->bvx;
filter->by += filter->bvy;
GST_OBJECT_UNLOCK (filter);
return ret;
}
static void
gst_shagadelictv_finalize (GObject * object)
{
GstShagadelicTV *filter = GST_SHAGADELICTV (object);
if (filter->ripple)
g_free (filter->ripple);
filter->ripple = NULL;
if (filter->spiral)
g_free (filter->spiral);
filter->spiral = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_shagadelictv_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "ShagadelicTV",
"Filter/Effect/Video",
"Oh behave, ShagedelicTV makes images shagadelic!",
"Wim Taymans <wim.taymans@chello.be>");
gst_element_class_add_static_pad_template (element_class,
&gst_shagadelictv_sink_template);
gst_element_class_add_static_pad_template (element_class,
&gst_shagadelictv_src_template);
}
static void
gst_shagadelictv_class_init (GstShagadelicTVClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
gobject_class->finalize = gst_shagadelictv_finalize;
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_shagadelictv_set_caps);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_shagadelictv_transform);
}
static void
gst_shagadelictv_init (GstShagadelicTV * filter, GstShagadelicTVClass * klass)
{
filter->ripple = NULL;
filter->spiral = NULL;
}