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 *****************************************************************************/
29 #include <math.h> /* sin(), cos() */
37 #include <vlc_filter.h>
39 /*****************************************************************************
41 *****************************************************************************/
42 static int Create ( vlc_object_t * );
43 static void Destroy ( vlc_object_t * );
45 static picture_t *Filter( filter_t *, picture_t * );
47 /*****************************************************************************
49 *****************************************************************************/
51 set_description( _("Ripple video filter") );
52 set_shortname( _( "Ripple" ));
53 set_capability( "video filter2", 0 );
54 set_category( CAT_VIDEO );
55 set_subcategory( SUBCAT_VIDEO_VFILTER );
57 add_shortcut( "ripple" );
58 set_callbacks( Create, Destroy );
61 /*****************************************************************************
62 * vout_sys_t: Distort video output method descriptor
63 *****************************************************************************
64 * This structure is part of the video output thread descriptor.
65 * It describes the Distort specific properties of an output thread.
66 *****************************************************************************/
73 /*****************************************************************************
74 * Create: allocates Distort video thread output method
75 *****************************************************************************
76 * This function allocates and initializes a Distort vout method.
77 *****************************************************************************/
78 static int Create( vlc_object_t *p_this )
80 filter_t *p_filter = (filter_t *)p_this;
82 /* Allocate structure */
83 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
84 if( p_filter->p_sys == NULL )
86 msg_Err( p_filter, "out of memory" );
90 p_filter->pf_video_filter = Filter;
92 p_filter->p_sys->f_angle = 0.0;
93 p_filter->p_sys->last_date = 0;
98 /*****************************************************************************
99 * Destroy: destroy Distort video thread output method
100 *****************************************************************************
101 * Terminate an output method created by DistortCreateOutputMethod
102 *****************************************************************************/
103 static void Destroy( vlc_object_t *p_this )
105 filter_t *p_filter = (filter_t *)p_this;
106 free( p_filter->p_sys );
109 /*****************************************************************************
110 * Render: displays previously rendered output
111 *****************************************************************************
112 * This function send the currently rendered image to Distort image, waits
113 * until it is displayed and switch the two rendering buffers, preparing next
115 *****************************************************************************/
116 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
121 mtime_t new_date = mdate();
123 if( !p_pic ) return NULL;
125 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
128 msg_Warn( p_filter, "can't get output picture" );
129 if( p_pic->pf_release )
130 p_pic->pf_release( p_pic );
134 p_filter->p_sys->f_angle -= (p_filter->p_sys->last_date - new_date) / 100000.0;
135 p_filter->p_sys->last_date = new_date;
136 f_angle = p_filter->p_sys->f_angle;
138 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
140 int i_line, i_first_line, i_num_lines, i_offset, i_pixel_pitch,
143 uint8_t *p_in, *p_out;
145 black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
147 i_num_lines = p_pic->p[i_index].i_visible_lines;
148 i_pixel_pitch = p_pic->p[i_index].i_pixel_pitch;
149 i_visible_pixels = p_pic->p[i_index].i_visible_pitch/p_pic->p[i_index].i_pixel_pitch;
151 i_first_line = i_num_lines * 4 / 5;
153 p_in = p_pic->p[i_index].p_pixels;
154 p_out = p_outpic->p[i_index].p_pixels;
156 for( i_line = 0 ; i_line < i_first_line ; i_line++ )
158 p_filter->p_libvlc->pf_memcpy( p_out, p_in,
159 p_pic->p[i_index].i_visible_pitch );
160 p_in += p_pic->p[i_index].i_pitch;
161 p_out += p_outpic->p[i_index].i_pitch;
164 /* Ok, we do 3 times the sin() calculation for each line. So what ? */
165 for( i_line = i_first_line ; i_line < i_num_lines ; i_line++ )
167 /* Calculate today's offset, don't go above 1/20th of the screen */
168 i_offset = (int)( (double)(i_visible_pixels)
169 * sin( f_angle + 2.0 * (double)i_line
170 / (double)( 1 + i_line
172 * (double)(i_line - i_first_line)
173 / (double)i_num_lines
174 / 8.0 )*p_pic->p[i_index].i_pixel_pitch;
180 p_filter->p_libvlc->pf_memcpy( p_out, p_in - i_offset,
181 p_pic->p[i_index].i_visible_pitch + i_offset );
182 p_in -= p_pic->p[i_index].i_pitch;
183 p_out += p_outpic->p[i_index].i_pitch;
184 p_filter->p_libvlc->pf_memset( p_out + i_offset,
185 black_pixel, -i_offset );
189 p_filter->p_libvlc->pf_memcpy( p_out + i_offset, p_in,
190 p_pic->p[i_index].i_visible_pitch - i_offset );
191 p_filter->p_libvlc->pf_memset( p_out, black_pixel,
193 p_in -= p_pic->p[i_index].i_pitch;
194 p_out += p_outpic->p[i_index].i_pitch;
199 p_filter->p_libvlc->pf_memcpy( p_out, p_in,
200 p_pic->p[i_index].i_visible_pitch );
201 p_in -= p_pic->p[i_index].i_pitch;
202 p_out += p_outpic->p[i_index].i_pitch;
208 p_outpic->date = p_pic->date;
209 p_outpic->b_force = p_pic->b_force;
210 p_outpic->i_nb_fields = p_pic->i_nb_fields;
211 p_outpic->b_progressive = p_pic->b_progressive;
212 p_outpic->b_top_field_first = p_pic->b_top_field_first;
214 if( p_pic->pf_release )
215 p_pic->pf_release( p_pic );