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315 lines
9.1 KiB
C
315 lines
9.1 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
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*
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* dice.c: a 'dicing' effect
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* copyright (c) 2001 Sam Mertens. This code is subject to the provisions of
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* the GNU Library Public License.
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*
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* I suppose this looks similar to PuzzleTV, but it's not. The screen is
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* divided into small squares, each of which is rotated either 0, 90, 180 or
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* 270 degrees. The amount of rotation for each square is chosen at random.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-dicetv
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* @title: dicetv
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*
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* DiceTV 'dices' the screen up into many small squares, each defaulting
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* to a size of 16 pixels by 16 pixels.. Each square is rotated randomly
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* in one of four directions: up (no change), down (180 degrees, or
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* upside down), right (90 degrees clockwise), or left (90 degrees
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* counterclockwise). The direction of each square normally remains
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* consistent between each frame.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v videotestsrc ! dicetv ! videoconvert ! autovideosink
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* ]| This pipeline shows the effect of dicetv on a test stream.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "gstdice.h"
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#include "gsteffectv.h"
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#define DEFAULT_CUBE_BITS 4
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#define MAX_CUBE_BITS 5
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#define MIN_CUBE_BITS 0
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typedef enum _dice_dir
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{
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DICE_UP = 0,
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DICE_RIGHT = 1,
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DICE_DOWN = 2,
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DICE_LEFT = 3
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} DiceDir;
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#define gst_dicetv_parent_class parent_class
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G_DEFINE_TYPE (GstDiceTV, gst_dicetv, GST_TYPE_VIDEO_FILTER);
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static void gst_dicetv_create_map (GstDiceTV * filter, GstVideoInfo * info);
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static GstStaticPadTemplate gst_dicetv_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ RGBx, xRGB, BGRx, xBGR }"))
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);
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static GstStaticPadTemplate gst_dicetv_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ RGBx, xRGB, BGRx, xBGR }"))
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);
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enum
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{
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PROP_0,
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PROP_CUBE_BITS
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};
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static gboolean
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gst_dicetv_set_info (GstVideoFilter * vfilter, GstCaps * incaps,
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GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
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{
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GstDiceTV *filter = GST_DICETV (vfilter);
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g_free (filter->dicemap);
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filter->dicemap =
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(guint8 *) g_malloc (GST_VIDEO_INFO_WIDTH (in_info) *
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GST_VIDEO_INFO_WIDTH (in_info));
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gst_dicetv_create_map (filter, in_info);
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return TRUE;
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}
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static GstFlowReturn
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gst_dicetv_transform_frame (GstVideoFilter * vfilter, GstVideoFrame * in_frame,
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GstVideoFrame * out_frame)
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{
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GstDiceTV *filter = GST_DICETV (vfilter);
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guint32 *src, *dest;
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gint i, map_x, map_y, map_i, base, dx, dy, di;
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gint video_stride, g_cube_bits, g_cube_size;
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gint g_map_height, g_map_width;
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GstClockTime timestamp, stream_time;
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const guint8 *dicemap;
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timestamp = GST_BUFFER_TIMESTAMP (in_frame->buffer);
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stream_time =
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gst_segment_to_stream_time (&GST_BASE_TRANSFORM (vfilter)->segment,
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GST_FORMAT_TIME, timestamp);
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GST_DEBUG_OBJECT (filter, "sync to %" GST_TIME_FORMAT,
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GST_TIME_ARGS (timestamp));
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if (GST_CLOCK_TIME_IS_VALID (stream_time))
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gst_object_sync_values (GST_OBJECT (filter), stream_time);
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src = (guint32 *) GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
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dest = (guint32 *) GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);
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video_stride = GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 0);
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GST_OBJECT_LOCK (filter);
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g_cube_bits = filter->g_cube_bits;
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g_cube_size = filter->g_cube_size;
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g_map_height = filter->g_map_height;
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g_map_width = filter->g_map_width;
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dicemap = filter->dicemap;
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video_stride /= 4;
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map_i = 0;
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for (map_y = 0; map_y < g_map_height; map_y++) {
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for (map_x = 0; map_x < g_map_width; map_x++) {
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base = (map_y << g_cube_bits) * video_stride + (map_x << g_cube_bits);
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switch (dicemap[map_i]) {
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case DICE_UP:
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for (dy = 0; dy < g_cube_size; dy++) {
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i = base + dy * video_stride;
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for (dx = 0; dx < g_cube_size; dx++) {
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dest[i] = src[i];
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i++;
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}
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}
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break;
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case DICE_LEFT:
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for (dy = 0; dy < g_cube_size; dy++) {
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i = base + dy * video_stride;
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for (dx = 0; dx < g_cube_size; dx++) {
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di = base + (dx * video_stride) + (g_cube_size - dy - 1);
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dest[di] = src[i];
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i++;
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}
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}
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break;
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case DICE_DOWN:
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for (dy = 0; dy < g_cube_size; dy++) {
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di = base + dy * video_stride;
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i = base + (g_cube_size - dy - 1) * video_stride + g_cube_size;
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for (dx = 0; dx < g_cube_size; dx++) {
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i--;
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dest[di] = src[i];
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di++;
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}
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}
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break;
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case DICE_RIGHT:
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for (dy = 0; dy < g_cube_size; dy++) {
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i = base + (dy * video_stride);
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for (dx = 0; dx < g_cube_size; dx++) {
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di = base + dy + (g_cube_size - dx - 1) * video_stride;
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dest[di] = src[i];
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i++;
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}
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}
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break;
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default:
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g_assert_not_reached ();
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break;
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}
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map_i++;
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}
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}
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GST_OBJECT_UNLOCK (filter);
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return GST_FLOW_OK;
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}
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static void
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gst_dicetv_create_map (GstDiceTV * filter, GstVideoInfo * info)
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{
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gint x, y, i;
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gint width, height;
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width = GST_VIDEO_INFO_WIDTH (info);
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height = GST_VIDEO_INFO_HEIGHT (info);
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if (width <= 0 || height <= 0)
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return;
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filter->g_map_height = height >> filter->g_cube_bits;
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filter->g_map_width = width >> filter->g_cube_bits;
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filter->g_cube_size = 1 << filter->g_cube_bits;
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i = 0;
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for (y = 0; y < filter->g_map_height; y++) {
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for (x = 0; x < filter->g_map_width; x++) {
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// dicemap[i] = ((i + y) & 0x3); /* Up, Down, Left or Right */
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filter->dicemap[i] = (fastrand () >> 24) & 0x03;
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i++;
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}
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}
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}
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static void
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gst_dicetv_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstDiceTV *filter = GST_DICETV (object);
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switch (prop_id) {
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case PROP_CUBE_BITS:
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GST_OBJECT_LOCK (filter);
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filter->g_cube_bits = g_value_get_int (value);
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gst_dicetv_create_map (filter, &GST_VIDEO_FILTER (filter)->in_info);
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GST_OBJECT_UNLOCK (filter);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_dicetv_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstDiceTV *filter = GST_DICETV (object);
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switch (prop_id) {
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case PROP_CUBE_BITS:
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g_value_set_int (value, filter->g_cube_bits);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_dicetv_finalize (GObject * object)
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{
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GstDiceTV *filter = GST_DICETV (object);
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g_free (filter->dicemap);
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filter->dicemap = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_dicetv_class_init (GstDiceTVClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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GstElementClass *gstelement_class = (GstElementClass *) klass;
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GstVideoFilterClass *vfilter_class = (GstVideoFilterClass *) klass;
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gobject_class->set_property = gst_dicetv_set_property;
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gobject_class->get_property = gst_dicetv_get_property;
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gobject_class->finalize = gst_dicetv_finalize;
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g_object_class_install_property (gobject_class, PROP_CUBE_BITS,
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g_param_spec_int ("square-bits", "Square Bits", "The size of the Squares",
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MIN_CUBE_BITS, MAX_CUBE_BITS, DEFAULT_CUBE_BITS,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
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gst_element_class_set_static_metadata (gstelement_class, "DiceTV effect",
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"Filter/Effect/Video",
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"'Dices' the screen up into many small squares",
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"Wim Taymans <wim.taymans@gmail.be>");
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_dicetv_sink_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_dicetv_src_template);
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vfilter_class->set_info = GST_DEBUG_FUNCPTR (gst_dicetv_set_info);
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vfilter_class->transform_frame =
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GST_DEBUG_FUNCPTR (gst_dicetv_transform_frame);
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}
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static void
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gst_dicetv_init (GstDiceTV * filter)
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{
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filter->dicemap = NULL;
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filter->g_cube_bits = DEFAULT_CUBE_BITS;
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filter->g_cube_size = 0;
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filter->g_map_height = 0;
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filter->g_map_width = 0;
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}
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