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() */
33 #include <vlc_filter.h>
35 /*****************************************************************************
37 *****************************************************************************/
38 static int Create ( vlc_object_t * );
39 static void Destroy ( vlc_object_t * );
41 static picture_t *Filter( filter_t *, picture_t * );
43 /*****************************************************************************
45 *****************************************************************************/
47 set_description( _("Ripple video filter") );
48 set_shortname( _( "Ripple" ));
49 set_capability( "video filter2", 0 );
50 set_category( CAT_VIDEO );
51 set_subcategory( SUBCAT_VIDEO_VFILTER );
53 add_shortcut( "ripple" );
54 set_callbacks( Create, Destroy );
57 /*****************************************************************************
58 * vout_sys_t: Distort video output method descriptor
59 *****************************************************************************
60 * This structure is part of the video output thread descriptor.
61 * It describes the Distort specific properties of an output thread.
62 *****************************************************************************/
69 /*****************************************************************************
70 * Create: allocates Distort video thread output method
71 *****************************************************************************
72 * This function allocates and initializes a Distort vout method.
73 *****************************************************************************/
74 static int Create( vlc_object_t *p_this )
76 filter_t *p_filter = (filter_t *)p_this;
78 /* Allocate structure */
79 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
80 if( p_filter->p_sys == NULL )
82 msg_Err( p_filter, "out of memory" );
86 p_filter->pf_video_filter = Filter;
88 p_filter->p_sys->f_angle = 0.0;
89 p_filter->p_sys->last_date = 0;
94 /*****************************************************************************
95 * Destroy: destroy Distort video thread output method
96 *****************************************************************************
97 * Terminate an output method created by DistortCreateOutputMethod
98 *****************************************************************************/
99 static void Destroy( vlc_object_t *p_this )
101 filter_t *p_filter = (filter_t *)p_this;
102 free( p_filter->p_sys );
105 /*****************************************************************************
106 * Render: displays previously rendered output
107 *****************************************************************************
108 * This function send the currently rendered image to Distort image, waits
109 * until it is displayed and switch the two rendering buffers, preparing next
111 *****************************************************************************/
112 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
117 mtime_t new_date = mdate();
119 if( !p_pic ) return NULL;
121 p_outpic = p_filter->pf_vout_buffer_new( p_filter );
124 msg_Warn( p_filter, "can't get output picture" );
125 if( p_pic->pf_release )
126 p_pic->pf_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;
138 uint8_t *p_in, *p_out;
140 black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
142 i_num_lines = p_pic->p[i_index].i_visible_lines;
144 i_first_line = i_num_lines * 4 / 5;
146 p_in = p_pic->p[i_index].p_pixels;
147 p_out = p_outpic->p[i_index].p_pixels;
149 for( i_line = 0 ; i_line < i_first_line ; i_line++ )
151 p_filter->p_libvlc->pf_memcpy( p_out, p_in,
152 p_pic->p[i_index].i_visible_pitch );
153 p_in += p_pic->p[i_index].i_pitch;
154 p_out += p_outpic->p[i_index].i_pitch;
157 /* Ok, we do 3 times the sin() calculation for each line. So what ? */
158 for( i_line = i_first_line ; i_line < i_num_lines ; i_line++ )
160 /* Calculate today's offset, don't go above 1/20th of the screen */
161 i_offset = (int)( (double)(p_pic->p[i_index].i_pitch)
162 * sin( f_angle + 2.0 * (double)i_line
163 / (double)( 1 + i_line
165 * (double)(i_line - i_first_line)
166 / (double)i_num_lines
173 p_filter->p_libvlc->pf_memcpy( p_out, p_in - i_offset,
174 p_pic->p[i_index].i_visible_pitch + i_offset );
175 p_in -= p_pic->p[i_index].i_pitch;
176 p_out += p_outpic->p[i_index].i_pitch;
177 p_filter->p_libvlc->pf_memset( p_out + i_offset,
178 black_pixel, -i_offset );
182 p_filter->p_libvlc->pf_memcpy( p_out + i_offset, p_in,
183 p_pic->p[i_index].i_visible_pitch - i_offset );
184 p_filter->p_libvlc->pf_memset( p_out, black_pixel,
186 p_in -= p_pic->p[i_index].i_pitch;
187 p_out += p_outpic->p[i_index].i_pitch;
192 p_filter->p_libvlc->pf_memcpy( p_out, p_in,
193 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 p_outpic->date = p_pic->date;
202 p_outpic->b_force = p_pic->b_force;
203 p_outpic->i_nb_fields = p_pic->i_nb_fields;
204 p_outpic->b_progressive = p_pic->b_progressive;
205 p_outpic->b_top_field_first = p_pic->b_top_field_first;
207 if( p_pic->pf_release )
208 p_pic->pf_release( p_pic );