gstreamer/gst/effectv/gstdice.c

313 lines
9 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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.
*
* 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-dicetv
*
* DiceTV 'dices' the screen up into many small squares, each defaulting
* to a size of 16 pixels by 16 pixels.. Each square is rotated randomly
* in one of four directions: up (no change), down (180 degrees, or
* upside down), right (90 degrees clockwise), or left (90 degrees
* counterclockwise). The direction of each square normally remains
* consistent between each frame.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! dicetv ! ffmpegcolorspace ! autovideosink
* ]| This pipeline shows the effect of dicetv on a test stream.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstdice.h"
#include "gsteffectv.h"
#include <gst/video/video.h>
#include <gst/controller/gstcontroller.h>
#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;
GST_BOILERPLATE (GstDiceTV, gst_dicetv, GstVideoFilter, GST_TYPE_VIDEO_FILTER);
static void gst_dicetv_create_map (GstDiceTV * filter);
static GstStaticPadTemplate gst_dicetv_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_dicetv_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)
);
enum
{
PROP_0,
PROP_CUBE_BITS
};
static gboolean
gst_dicetv_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstDiceTV *filter = GST_DICETV (btrans);
GstStructure *structure;
gboolean ret = FALSE;
structure = gst_caps_get_structure (incaps, 0);
if (gst_structure_get_int (structure, "width", &filter->width) &&
gst_structure_get_int (structure, "height", &filter->height)) {
g_free (filter->dicemap);
filter->dicemap = (guint8 *) g_malloc (filter->height * filter->width);
gst_dicetv_create_map (filter);
ret = TRUE;
}
return ret;
}
static GstFlowReturn
gst_dicetv_transform (GstBaseTransform * trans, GstBuffer * in, GstBuffer * out)
{
GstDiceTV *filter = GST_DICETV (trans);
guint32 *src, *dest;
gint i, map_x, map_y, map_i, base, dx, dy, di;
gint video_width, g_cube_bits, g_cube_size;
GstFlowReturn ret = GST_FLOW_OK;
GstClockTime timestamp, stream_time;
src = (guint32 *) GST_BUFFER_DATA (in);
dest = (guint32 *) GST_BUFFER_DATA (out);
timestamp = GST_BUFFER_TIMESTAMP (in);
stream_time =
gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME, timestamp);
GST_DEBUG_OBJECT (filter, "sync to %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
if (GST_CLOCK_TIME_IS_VALID (stream_time))
gst_object_sync_values (G_OBJECT (filter), stream_time);
video_width = filter->width;
g_cube_bits = filter->g_cube_bits;
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++;
}
}
return ret;
}
static void
gst_dicetv_create_map (GstDiceTV * filter)
{
gint x, y, i;
if (filter->height <= 0 || filter->width <= 0)
return;
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_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstDiceTV *filter = GST_DICETV (object);
switch (prop_id) {
case PROP_CUBE_BITS:
filter->g_cube_bits = g_value_get_int (value);
gst_dicetv_create_map (filter);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_dicetv_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstDiceTV *filter = GST_DICETV (object);
switch (prop_id) {
case PROP_CUBE_BITS:
g_value_set_int (value, filter->g_cube_bits);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_dicetv_finalize (GObject * object)
{
GstDiceTV *filter = GST_DICETV (object);
g_free (filter->dicemap);
filter->dicemap = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_dicetv_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "DiceTV effect",
"Filter/Effect/Video",
"'Dices' the screen up into many small squares",
"Wim Taymans <wim.taymans@chello.be>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_dicetv_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_dicetv_src_template));
}
static void
gst_dicetv_class_init (GstDiceTVClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
gobject_class->set_property = gst_dicetv_set_property;
gobject_class->get_property = gst_dicetv_get_property;
gobject_class->finalize = gst_dicetv_finalize;
g_object_class_install_property (gobject_class, PROP_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 | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_dicetv_set_caps);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_dicetv_transform);
}
static void
gst_dicetv_init (GstDiceTV * filter, GstDiceTVClass * klass)
{
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;
}