gstreamer/gst/effectv/gstdice.c

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* dice.c: a 'dicing' effect
* copyright (c) 2001 Sam Mertens. This code is subject to the provisions of
* the GNU Library Public License.
*
* I suppose this looks similar to PuzzleTV, but it's not. The screen is
* divided into small squares, each of which is rotated either 0, 90, 180 or
* 270 degrees. The amount of rotation for each square is chosen at random.
*/
#include <string.h>
#include <gst/gst.h>
#include "gsteffectv.h"
#define GST_TYPE_DICETV \
(gst_dicetv_get_type())
#define GST_DICETV(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DICETV,GstDiceTV))
#define GST_DICETV_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ULAW,GstDiceTV))
#define GST_IS_DICETV(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DICETV))
#define GST_IS_DICETV_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DICETV))
typedef struct _GstDiceTV GstDiceTV;
typedef struct _GstDiceTVClass GstDiceTVClass;
#define DEFAULT_CUBE_BITS 4
#define MAX_CUBE_BITS 5
#define MIN_CUBE_BITS 0
typedef enum _dice_dir
{
DICE_UP = 0,
DICE_RIGHT = 1,
DICE_DOWN = 2,
DICE_LEFT = 3
} DiceDir;
struct _GstDiceTV
{
GstElement element;
GstPad *sinkpad, *srcpad;
gint width, height;
gchar* dicemap;
gint g_cube_bits;
gint g_cube_size;
gint g_map_height;
gint g_map_width;
};
struct _GstDiceTVClass
{
GstElementClass parent_class;
void (*reset) (GstElement *element);
};
GstElementDetails gst_dicetv_details = {
"DiceTV",
"Filter/Video/Effect",
"'Dices' the screen up into many small squares",
VERSION,
"Wim Taymans <wim.taymans@chello.be>",
"(c) 2001 Sam Mertens",
};
/* Filter signals and args */
enum
{
/* FILL ME */
RESET_SIGNAL,
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_CUBE_BITS,
};
static void gst_dicetv_class_init (GstDiceTVClass * klass);
static void gst_dicetv_init (GstDiceTV * filter);
static void gst_dicetv_reset_handler (GstElement *elem);
static void gst_dicetv_create_map (GstDiceTV *filter);
static void gst_dicetv_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_dicetv_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_dicetv_chain (GstPad * pad, GstBuffer * buf);
static GstElementClass *parent_class = NULL;
static guint gst_dicetv_signals[LAST_SIGNAL] = { 0 };
GType gst_dicetv_get_type (void)
{
static GType dicetv_type = 0;
if (!dicetv_type) {
static const GTypeInfo dicetv_info = {
sizeof (GstDiceTVClass), NULL,
NULL,
(GClassInitFunc) gst_dicetv_class_init,
NULL,
NULL,
sizeof (GstDiceTV),
0,
(GInstanceInitFunc) gst_dicetv_init,
};
dicetv_type = g_type_register_static (GST_TYPE_ELEMENT, "GstDiceTV", &dicetv_info, 0);
}
return dicetv_type;
}
static void
gst_dicetv_class_init (GstDiceTVClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gst_dicetv_signals[RESET_SIGNAL] =
g_signal_new ("reset",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDiceTVClass, reset),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
klass->reset = gst_dicetv_reset_handler;
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_CUBE_BITS,
g_param_spec_int ("square_bits","Square Bits","The size of the Squares",
MIN_CUBE_BITS, MAX_CUBE_BITS, DEFAULT_CUBE_BITS, G_PARAM_READWRITE));
gobject_class->set_property = gst_dicetv_set_property;
gobject_class->get_property = gst_dicetv_get_property;
}
static GstPadConnectReturn
gst_dicetv_sinkconnect (GstPad * pad, GstCaps * caps)
{
GstDiceTV *filter;
filter = GST_DICETV (gst_pad_get_parent (pad));
if (!GST_CAPS_IS_FIXED (caps))
return GST_PAD_CONNECT_DELAYED;
gst_caps_get_int (caps, "width", &filter->width);
gst_caps_get_int (caps, "height", &filter->height);
g_free (filter->dicemap);
filter->dicemap = (gchar *) g_malloc (filter->height * filter->width * sizeof(char));
gst_dicetv_create_map (filter);
return gst_pad_try_set_caps (filter->srcpad, caps);
}
static void
gst_dicetv_init (GstDiceTV * filter)
{
filter->sinkpad = gst_pad_new_from_template (gst_effectv_sink_factory (), "sink");
gst_pad_set_chain_function (filter->sinkpad, gst_dicetv_chain);
gst_pad_set_connect_function (filter->sinkpad, gst_dicetv_sinkconnect);
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
filter->srcpad = gst_pad_new_from_template (gst_effectv_src_factory (), "src");
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
filter->dicemap = NULL;
filter->g_cube_bits = DEFAULT_CUBE_BITS;
filter->g_cube_size = 0;
filter->g_map_height = 0;
filter->g_map_width = 0;
}
static void
gst_dicetv_reset_handler (GstElement *element)
{
GstDiceTV *filter = GST_DICETV (element);
gst_dicetv_create_map (filter);
}
static unsigned int
fastrand (void)
{
static unsigned int fastrand_val;
return (fastrand_val = fastrand_val * 1103515245 + 12345);
}
static void
gst_dicetv_draw (GstDiceTV *filter, guint32 *src, guint32 *dest)
{
gint i;
gint map_x, map_y, map_i;
gint base;
gint dx, dy, di;
gint video_width = filter->width;
gint g_cube_bits = filter->g_cube_bits;
gint g_cube_size = filter->g_cube_size;
map_i = 0;
for (map_y = 0; map_y < filter->g_map_height; map_y++) {
for (map_x = 0; map_x < filter->g_map_width; map_x++) {
base = (map_y << g_cube_bits) * video_width + (map_x << g_cube_bits);
switch (filter->dicemap[map_i]) {
case DICE_UP:
for (dy = 0; dy < g_cube_size; dy++) {
i = base + dy * video_width;
for (dx = 0; dx < g_cube_size; dx++) {
dest[i] = src[i];
i++;
}
}
break;
case DICE_LEFT:
for (dy = 0; dy < g_cube_size; dy++) {
i = base + dy * video_width;
for (dx = 0; dx < g_cube_size; dx++) {
di = base + (dx * video_width) + (g_cube_size - dy - 1);
dest[di] = src[i];
i++;
}
}
break;
case DICE_DOWN:
for (dy = 0; dy < g_cube_size; dy++) {
di = base + dy * video_width;
i = base + (g_cube_size - dy - 1) * video_width + g_cube_size;
for (dx = 0; dx < g_cube_size; dx++) {
i--;
dest[di] = src[i];
di++;
}
}
break;
case DICE_RIGHT:
for (dy = 0; dy < g_cube_size; dy++) {
i = base + (dy * video_width);
for (dx = 0; dx < g_cube_size; dx++) {
di = base + dy + (g_cube_size - dx - 1) * video_width;
dest[di] = src[i];
i++;
}
}
break;
default:
g_assert_not_reached ();
break;
}
map_i++;
}
}
}
static void
gst_dicetv_create_map (GstDiceTV *filter)
{
gint x, y, i;
filter->g_map_height = filter->height >> filter->g_cube_bits;
filter->g_map_width = filter->width >> filter->g_cube_bits;
filter->g_cube_size = 1 << filter->g_cube_bits;
i = 0;
for (y = 0; y < filter->g_map_height; y++) {
for(x = 0; x < filter->g_map_width; x++) {
// dicemap[i] = ((i + y) & 0x3); /* Up, Down, Left or Right */
filter->dicemap[i] = (fastrand() >> 24) & 0x03;
i++;
}
}
}
static void
gst_dicetv_chain (GstPad * pad, GstBuffer * buf)
{
GstDiceTV *filter;
guint32 *src, *dest;
GstBuffer *outbuf;
filter = GST_DICETV (gst_pad_get_parent (pad));
src = (guint32 *) GST_BUFFER_DATA (buf);
outbuf = gst_buffer_new ();
GST_BUFFER_SIZE (outbuf) = (filter->width * filter->height * sizeof(guint32));
dest = (guint32 *) GST_BUFFER_DATA (outbuf) = g_malloc (GST_BUFFER_SIZE (outbuf));
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buf);
gst_dicetv_draw (filter, src, dest);
gst_buffer_unref (buf);
gst_pad_push (filter->srcpad, outbuf);
}
static void
gst_dicetv_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstDiceTV *filter;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_DICETV (object));
filter = GST_DICETV (object);
switch (prop_id) {
case ARG_CUBE_BITS:
filter->g_cube_bits = g_value_get_int (value);
gst_dicetv_create_map (filter);
default:
break;
}
}
static void
gst_dicetv_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec)
{
GstDiceTV *filter;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_DICETV (object));
filter = GST_DICETV (object);
switch (prop_id) {
case ARG_CUBE_BITS:
g_value_set_int (value, filter->g_cube_bits);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}