1 /*****************************************************************************
2 * ripple.c : Ripple video effect plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2000-2006 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
8 * Antoine Cellerier <dionoea -at- videolan -dot- org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <math.h> /* sin(), cos() */
35 #include <vlc_common.h>
36 #include <vlc_plugin.h>
37 #include <vlc_filter.h>
38 #include "filter_picture.h"
40 /*****************************************************************************
42 *****************************************************************************/
43 static int Create ( vlc_object_t * );
44 static void Destroy ( vlc_object_t * );
46 static picture_t *Filter( filter_t *, picture_t * );
48 /*****************************************************************************
50 *****************************************************************************/
52 set_description( N_("Ripple video filter") )
53 set_shortname( N_( "Ripple" ))
54 set_capability( "video filter2", 0 )
55 set_category( CAT_VIDEO )
56 set_subcategory( SUBCAT_VIDEO_VFILTER )
58 add_shortcut( "ripple" )
59 set_callbacks( Create, Destroy )
62 /*****************************************************************************
63 * filter_sys_t: Distort video output method descriptor
64 *****************************************************************************
65 * This structure is part of the video output thread descriptor.
66 * It describes the Distort specific properties of an output thread.
67 *****************************************************************************/
74 /*****************************************************************************
75 * Create: allocates Distort video thread output method
76 *****************************************************************************
77 * This function allocates and initializes a Distort vout method.
78 *****************************************************************************/
79 static int Create( vlc_object_t *p_this )
81 filter_t *p_filter = (filter_t *)p_this;
83 /* Allocate structure */
84 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
85 if( p_filter->p_sys == NULL )
88 p_filter->pf_video_filter = Filter;
90 p_filter->p_sys->f_angle = 0.0;
91 p_filter->p_sys->last_date = 0;
96 /*****************************************************************************
97 * Destroy: destroy Distort video thread output method
98 *****************************************************************************
99 * Terminate an output method created by DistortCreateOutputMethod
100 *****************************************************************************/
101 static void Destroy( vlc_object_t *p_this )
103 filter_t *p_filter = (filter_t *)p_this;
104 free( p_filter->p_sys );
107 /*****************************************************************************
108 * Render: displays previously rendered output
109 *****************************************************************************
110 * This function send the currently rendered image to Distort image, waits
111 * until it is displayed and switch the two rendering buffers, preparing next
113 *****************************************************************************/
114 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
119 mtime_t new_date = mdate();
121 if( !p_pic ) return NULL;
123 p_outpic = filter_NewPicture( p_filter );
126 picture_Release( p_pic );
130 p_filter->p_sys->f_angle -= (p_filter->p_sys->last_date - new_date) / 100000.0;
131 p_filter->p_sys->last_date = new_date;
132 f_angle = p_filter->p_sys->f_angle;
134 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
136 int i_line, i_first_line, i_num_lines, i_offset, i_pixel_pitch,
139 uint8_t *p_in, *p_out;
141 black_pixel = ( p_pic->i_planes > 1 && i_index == Y_PLANE ) ? 0x00
144 i_num_lines = p_pic->p[i_index].i_visible_lines;
145 i_pixel_pitch = p_pic->p[i_index].i_pixel_pitch;
146 i_visible_pixels = p_pic->p[i_index].i_visible_pitch/p_pic->p[i_index].i_pixel_pitch;
148 i_first_line = i_num_lines * 4 / 5;
150 p_in = p_pic->p[i_index].p_pixels;
151 p_out = p_outpic->p[i_index].p_pixels;
153 for( i_line = 0 ; i_line < i_first_line ; i_line++ )
155 vlc_memcpy( p_out, p_in, p_pic->p[i_index].i_visible_pitch );
156 p_in += p_pic->p[i_index].i_pitch;
157 p_out += p_outpic->p[i_index].i_pitch;
160 /* Ok, we do 3 times the sin() calculation for each line. So what ? */
161 for( i_line = i_first_line ; i_line < i_num_lines ; i_line++ )
163 /* Calculate today's offset, don't go above 1/20th of the screen */
164 i_offset = (int)( (double)(i_visible_pixels)
165 * sin( f_angle + 2.0 * (double)i_line
166 / (double)( 1 + i_line
168 * (double)(i_line - i_first_line)
169 / (double)i_num_lines
170 / 8.0 )*p_pic->p[i_index].i_pixel_pitch;
176 vlc_memcpy( p_out, p_in - i_offset,
177 p_pic->p[i_index].i_visible_pitch + i_offset );
178 p_in -= p_pic->p[i_index].i_pitch;
179 p_out += p_outpic->p[i_index].i_pitch;
180 vlc_memset( p_out + i_offset, black_pixel, -i_offset );
184 vlc_memcpy( p_out + i_offset, p_in,
185 p_pic->p[i_index].i_visible_pitch - i_offset );
186 vlc_memset( p_out, black_pixel, i_offset );
187 p_in -= p_pic->p[i_index].i_pitch;
188 p_out += p_outpic->p[i_index].i_pitch;
193 vlc_memcpy( p_out, p_in, p_pic->p[i_index].i_visible_pitch );
194 p_in -= p_pic->p[i_index].i_pitch;
195 p_out += p_outpic->p[i_index].i_pitch;
201 return CopyInfoAndRelease( p_outpic, p_pic );