gstreamer/gst/effectv/gstshagadelic.c
2011-07-07 17:29:58 +02:00

295 lines
7.9 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 ! videoconvert ! 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"
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#define gst_shagadelictv_parent_class parent_class
G_DEFINE_TYPE (GstShagadelicTV, gst_shagadelictv, GST_TYPE_VIDEO_FILTER);
static void gst_shagadelic_initialize (GstShagadelicTV * filter);
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define CAPS_STR GST_VIDEO_CAPS_MAKE ("BGRx")
#else
#define CAPS_STR GST_VIDEO_CAPS_MAKE ("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);
GstVideoInfo info;
gint width, height, area;
if (!gst_video_info_from_caps (&info, incaps))
goto invalid_caps;
filter->info = info;
width = GST_VIDEO_INFO_WIDTH (&info);
height = GST_VIDEO_INFO_HEIGHT (&info);
area = width * 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);
return TRUE;
/* ERRORS */
invalid_caps:
{
GST_DEBUG_OBJECT (filter, "invalid caps received");
return FALSE;
}
}
static void
gst_shagadelic_initialize (GstShagadelicTV * filter)
{
int i, x, y;
#ifdef PS2
float xx, yy;
#else
double xx, yy;
#endif
gint width, height;
width = GST_VIDEO_INFO_WIDTH (&filter->info);
height = GST_VIDEO_INFO_HEIGHT (&filter->info);
i = 0;
for (y = 0; y < height * 2; y++) {
yy = y - height;
yy *= yy;
for (x = 0; x < width * 2; x++) {
xx = x - 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 < height; y++) {
yy = y - height / 2;
for (x = 0; x < width; x++) {
xx = x - 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 () % width;
filter->ry = fastrand () % height;
filter->bx = fastrand () % width;
filter->by = fastrand () % 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;
GstVideoFrame in_frame, out_frame;
gint width, height;
if (!gst_video_frame_map (&in_frame, &filter->info, in, GST_MAP_READ))
goto invalid_in;
if (!gst_video_frame_map (&out_frame, &filter->info, out, GST_MAP_WRITE))
goto invalid_out;
src = GST_VIDEO_FRAME_PLANE_DATA (&in_frame, 0);
dest = GST_VIDEO_FRAME_PLANE_DATA (&out_frame, 0);
width = GST_VIDEO_FRAME_WIDTH (&in_frame);
height = GST_VIDEO_FRAME_HEIGHT (&in_frame);
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_video_frame_unmap (&in_frame);
gst_video_frame_unmap (&out_frame);
return GST_FLOW_OK;
/* ERRORS */
invalid_in:
{
GST_DEBUG_OBJECT (filter, "invalid input frame");
return GST_FLOW_ERROR;
}
invalid_out:
{
GST_DEBUG_OBJECT (filter, "invalid output frame");
gst_video_frame_unmap (&in_frame);
return GST_FLOW_ERROR;
}
}
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_class_init (GstShagadelicTVClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
gobject_class->finalize = gst_shagadelictv_finalize;
gst_element_class_set_details_simple (gstelement_class, "ShagadelicTV",
"Filter/Effect/Video",
"Oh behave, ShagedelicTV makes images shagadelic!",
"Wim Taymans <wim.taymans@chello.be>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_shagadelictv_sink_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_shagadelictv_src_template));
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)
{
filter->ripple = NULL;
filter->spiral = NULL;
gst_pad_use_fixed_caps (GST_BASE_TRANSFORM_SRC_PAD (filter));
gst_pad_use_fixed_caps (GST_BASE_TRANSFORM_SINK_PAD (filter));
}