gstreamer/gst/effectv/gstwarp.c
2010-06-16 19:20:02 +02:00

293 lines
7.3 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2003> David Schleef <ds@schleef.org>
*
* EffecTV - Realtime Digital Video Effector
* Copyright (C) 2001 FUKUCHI Kentarou
*
* 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.
*/
/*
* This file was (probably) generated from gstvideotemplate.c,
* gstvideotemplate.c,v 1.11 2004/01/07 08:56:45 ds Exp
*/
/* From main.c of warp-1.1:
*
* Simple DirectMedia Layer demo
* Realtime picture 'gooing'
* by sam lantinga slouken@devolution.com
*/
/**
* SECTION:element-warptv
*
* WarpTV does realtime goo'ing of the video input.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! warptv ! ffmpegcolorspace ! autovideosink
* ]| This pipeline shows the effect of warptv on a test stream.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <math.h>
#include "gstwarp.h"
#include <gst/video/video.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
GST_BOILERPLATE (GstWarpTV, gst_warptv, GstVideoFilter, GST_TYPE_VIDEO_FILTER);
static void initSinTable ();
static void initOffsTable (GstWarpTV * filter);
static void initDistTable (GstWarpTV * filter);
static GstStaticPadTemplate gst_warptv_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_xRGB ";"
GST_VIDEO_CAPS_BGRx ";" GST_VIDEO_CAPS_xBGR)
);
static GstStaticPadTemplate gst_warptv_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_xRGB ";"
GST_VIDEO_CAPS_BGRx ";" GST_VIDEO_CAPS_xBGR)
);
static gboolean
gst_warptv_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstWarpTV *filter = GST_WARPTV (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)) {
g_free (filter->disttable);
g_free (filter->offstable);
filter->offstable = g_malloc (filter->height * sizeof (guint32));
filter->disttable =
g_malloc (filter->width * filter->height * sizeof (guint32));
initOffsTable (filter);
initDistTable (filter);
ret = TRUE;
}
GST_OBJECT_UNLOCK (filter);
return ret;
}
static gint32 sintable[1024 + 256];
static void
initSinTable (void)
{
gint32 *tptr, *tsinptr;
gint i;
tsinptr = tptr = sintable;
for (i = 0; i < 1024; i++)
*tptr++ = (int) (sin (i * M_PI / 512) * 32767);
for (i = 0; i < 256; i++)
*tptr++ = *tsinptr++;
}
static void
initOffsTable (GstWarpTV * filter)
{
gint y;
for (y = 0; y < filter->height; y++) {
filter->offstable[y] = y * filter->width;
}
}
static void
initDistTable (GstWarpTV * filter)
{
gint32 halfw, halfh, *distptr;
gint x, y;
#ifdef PS2
float m;
#else
float m;
#endif
halfw = filter->width >> 1;
halfh = filter->height >> 1;
distptr = filter->disttable;
m = sqrt ((double) (halfw * halfw + halfh * halfh));
for (y = -halfh; y < halfh; y++)
for (x = -halfw; x < halfw; x++)
#ifdef PS2
*distptr++ = ((int) ((sqrtf (x * x + y * y) * 511.9999) / m)) << 1;
#else
*distptr++ = ((int) ((sqrt (x * x + y * y) * 511.9999) / m)) << 1;
#endif
}
static GstFlowReturn
gst_warptv_transform (GstBaseTransform * trans, GstBuffer * in, GstBuffer * out)
{
GstWarpTV *warptv = GST_WARPTV (trans);
gint width, height;
guint32 *src = (guint32 *) GST_BUFFER_DATA (in);
guint32 *dest = (guint32 *) GST_BUFFER_DATA (out);
gint xw, yw, cw;
gint32 c, i, x, y, dx, dy, maxx, maxy;
gint32 skip, *ctptr, *distptr;
gint32 *ctable;
GstFlowReturn ret = GST_FLOW_OK;
GST_OBJECT_LOCK (warptv);
width = warptv->width;
height = warptv->height;
xw = (gint) (sin ((warptv->tval + 100) * M_PI / 128) * 30);
yw = (gint) (sin ((warptv->tval) * M_PI / 256) * -35);
cw = (gint) (sin ((warptv->tval - 70) * M_PI / 64) * 50);
xw += (gint) (sin ((warptv->tval - 10) * M_PI / 512) * 40);
yw += (gint) (sin ((warptv->tval + 30) * M_PI / 512) * 40);
ctptr = warptv->ctable;
distptr = warptv->disttable;
ctable = warptv->ctable;
skip = 0; /* video_width*sizeof(RGB32)/4 - video_width;; */
c = 0;
for (x = 0; x < 512; x++) {
i = (c >> 3) & 0x3FE;
*ctptr++ = ((sintable[i] * yw) >> 15);
*ctptr++ = ((sintable[i + 256] * xw) >> 15);
c += cw;
}
maxx = width - 2;
maxy = height - 2;
for (y = 0; y < height - 1; y++) {
for (x = 0; x < width; x++) {
i = *distptr++;
dx = ctable[i + 1] + x;
dy = ctable[i] + y;
if (dx < 0)
dx = 0;
else if (dx > maxx)
dx = maxx;
if (dy < 0)
dy = 0;
else if (dy > maxy)
dy = maxy;
*dest++ = src[warptv->offstable[dy] + dx];
}
dest += skip;
}
warptv->tval = (warptv->tval + 1) & 511;
GST_OBJECT_UNLOCK (warptv);
return ret;
}
static gboolean
gst_warptv_start (GstBaseTransform * trans)
{
GstWarpTV *warptv = GST_WARPTV (trans);
warptv->tval = 0;
return TRUE;
}
static void
gst_warptv_finalize (GObject * object)
{
GstWarpTV *warptv = GST_WARPTV (object);
g_free (warptv->offstable);
warptv->offstable = NULL;
g_free (warptv->disttable);
warptv->disttable = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_warptv_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "WarpTV effect",
"Filter/Effect/Video",
"WarpTV does realtime goo'ing of the video input",
"Sam Lantinga <slouken@devolution.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_warptv_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_warptv_src_template));
}
static void
gst_warptv_class_init (GstWarpTVClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
gobject_class->finalize = gst_warptv_finalize;
trans_class->start = GST_DEBUG_FUNCPTR (gst_warptv_start);
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_warptv_set_caps);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_warptv_transform);
initSinTable ();
}
static void
gst_warptv_init (GstWarpTV * warptv, GstWarpTVClass * klass)
{
gst_pad_use_fixed_caps (GST_BASE_TRANSFORM_SRC_PAD (warptv));
gst_pad_use_fixed_caps (GST_BASE_TRANSFORM_SINK_PAD (warptv));
}