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>
38 #include <vlc_filter.h>
39 #include "filter_picture.h"
41 /*****************************************************************************
43 *****************************************************************************/
44 static int Create ( vlc_object_t * );
45 static void Destroy ( vlc_object_t * );
47 static picture_t *Filter( filter_t *, picture_t * );
49 /*****************************************************************************
51 *****************************************************************************/
53 set_description( N_("Ripple video filter") );
54 set_shortname( N_( "Ripple" ));
55 set_capability( "video filter2", 0 );
56 set_category( CAT_VIDEO );
57 set_subcategory( SUBCAT_VIDEO_VFILTER );
59 add_shortcut( "ripple" );
60 set_callbacks( Create, Destroy );
63 /*****************************************************************************
64 * vout_sys_t: Distort video output method descriptor
65 *****************************************************************************
66 * This structure is part of the video output thread descriptor.
67 * It describes the Distort specific properties of an output thread.
68 *****************************************************************************/
75 /*****************************************************************************
76 * Create: allocates Distort video thread output method
77 *****************************************************************************
78 * This function allocates and initializes a Distort vout method.
79 *****************************************************************************/
80 static int Create( vlc_object_t *p_this )
82 filter_t *p_filter = (filter_t *)p_this;
84 /* Allocate structure */
85 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
86 if( p_filter->p_sys == NULL )
89 p_filter->pf_video_filter = Filter;
91 p_filter->p_sys->f_angle = 0.0;
92 p_filter->p_sys->last_date = 0;
97 /*****************************************************************************
98 * Destroy: destroy Distort video thread output method
99 *****************************************************************************
100 * Terminate an output method created by DistortCreateOutputMethod
101 *****************************************************************************/
102 static void Destroy( vlc_object_t *p_this )
104 filter_t *p_filter = (filter_t *)p_this;
105 free( p_filter->p_sys );
108 /*****************************************************************************
109 * Render: displays previously rendered output
110 *****************************************************************************
111 * This function send the currently rendered image to Distort image, waits
112 * until it is displayed and switch the two rendering buffers, preparing next
114 *****************************************************************************/
115 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
120 mtime_t new_date = mdate();
122 if( !p_pic ) return NULL;
124 p_outpic = filter_NewPicture( p_filter );
127 picture_Release( p_pic );
131 p_filter->p_sys->f_angle -= (p_filter->p_sys->last_date - new_date) / 100000.0;
132 p_filter->p_sys->last_date = new_date;
133 f_angle = p_filter->p_sys->f_angle;
135 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
137 int i_line, i_first_line, i_num_lines, i_offset, i_pixel_pitch,
140 uint8_t *p_in, *p_out;
142 black_pixel = ( p_pic->i_planes > 1 && i_index == Y_PLANE ) ? 0x00
145 i_num_lines = p_pic->p[i_index].i_visible_lines;
146 i_pixel_pitch = p_pic->p[i_index].i_pixel_pitch;
147 i_visible_pixels = p_pic->p[i_index].i_visible_pitch/p_pic->p[i_index].i_pixel_pitch;
149 i_first_line = i_num_lines * 4 / 5;
151 p_in = p_pic->p[i_index].p_pixels;
152 p_out = p_outpic->p[i_index].p_pixels;
154 for( i_line = 0 ; i_line < i_first_line ; i_line++ )
156 vlc_memcpy( p_out, p_in, p_pic->p[i_index].i_visible_pitch );
157 p_in += p_pic->p[i_index].i_pitch;
158 p_out += p_outpic->p[i_index].i_pitch;
161 /* Ok, we do 3 times the sin() calculation for each line. So what ? */
162 for( i_line = i_first_line ; i_line < i_num_lines ; i_line++ )
164 /* Calculate today's offset, don't go above 1/20th of the screen */
165 i_offset = (int)( (double)(i_visible_pixels)
166 * sin( f_angle + 2.0 * (double)i_line
167 / (double)( 1 + i_line
169 * (double)(i_line - i_first_line)
170 / (double)i_num_lines
171 / 8.0 )*p_pic->p[i_index].i_pixel_pitch;
177 vlc_memcpy( p_out, p_in - i_offset,
178 p_pic->p[i_index].i_visible_pitch + i_offset );
179 p_in -= p_pic->p[i_index].i_pitch;
180 p_out += p_outpic->p[i_index].i_pitch;
181 vlc_memset( p_out + i_offset, black_pixel, -i_offset );
185 vlc_memcpy( p_out + i_offset, p_in,
186 p_pic->p[i_index].i_visible_pitch - i_offset );
187 vlc_memset( p_out, black_pixel, i_offset );
188 p_in -= p_pic->p[i_index].i_pitch;
189 p_out += p_outpic->p[i_index].i_pitch;
194 vlc_memcpy( p_out, p_in, p_pic->p[i_index].i_visible_pitch );
195 p_in -= p_pic->p[i_index].i_pitch;
196 p_out += p_outpic->p[i_index].i_pitch;
202 return CopyInfoAndRelease( p_outpic, p_pic );