1 /*****************************************************************************
2 * wave.c : Wave video effect plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2000-2008 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>
39 #include "vlc_filter.h"
40 #include "filter_picture.h"
42 /*****************************************************************************
44 *****************************************************************************/
45 static int Create ( vlc_object_t * );
46 static void Destroy ( vlc_object_t * );
48 static picture_t *Filter( filter_t *, picture_t * );
50 /*****************************************************************************
52 *****************************************************************************/
54 set_description( N_("Wave video filter") );
55 set_shortname( N_( "Wave" ));
56 set_capability( "video filter2", 0 );
57 set_category( CAT_VIDEO );
58 set_subcategory( SUBCAT_VIDEO_VFILTER );
60 add_shortcut( "wave" );
61 set_callbacks( Create, Destroy );
64 /*****************************************************************************
65 * vout_sys_t: Distort video output method descriptor
66 *****************************************************************************
67 * This structure is part of the video output thread descriptor.
68 * It describes the Distort specific properties of an output thread.
69 *****************************************************************************/
76 /*****************************************************************************
77 * Create: allocates Distort video thread output method
78 *****************************************************************************
79 * This function allocates and initializes a Distort vout method.
80 *****************************************************************************/
81 static int Create( vlc_object_t *p_this )
83 filter_t *p_filter = (filter_t *)p_this;
85 /* Allocate structure */
86 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
87 if( p_filter->p_sys == NULL )
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 = filter_NewPicture( p_filter );
128 picture_Release( p_pic );
132 p_filter->p_sys->f_angle += (new_date - p_filter->p_sys->last_date) / 200000.0;
133 p_filter->p_sys->last_date = new_date;
134 f_angle = p_filter->p_sys->f_angle;
136 for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
138 int i_line, i_num_lines, i_visible_pitch, i_pixel_pitch, i_offset,
141 uint8_t *p_in, *p_out;
143 p_in = p_pic->p[i_index].p_pixels;
144 p_out = p_outpic->p[i_index].p_pixels;
146 i_num_lines = p_pic->p[i_index].i_visible_lines;
147 i_visible_pitch = p_pic->p[i_index].i_visible_pitch;
148 i_pixel_pitch = p_pic->p[i_index].i_pixel_pitch;
149 i_visible_pixels = i_visible_pitch/i_pixel_pitch;
151 black_pixel = ( p_pic->i_planes > 1 && i_index == Y_PLANE ) ? 0x00
154 /* Ok, we do 3 times the sin() calculation for each line. So what ? */
155 for( i_line = 0 ; i_line < i_num_lines ; i_line++ )
157 /* Calculate today's offset, don't go above 1/20th of the screen */
158 i_offset = (int)( (double)(i_visible_pixels)
159 * sin( f_angle + 10.0 * (double)i_line
160 / (double)i_num_lines )
161 / 20.0 )*i_pixel_pitch;
167 vlc_memcpy( p_out, p_in - i_offset,
168 i_visible_pitch + i_offset );
169 p_in += p_pic->p[i_index].i_pitch;
170 p_out += p_outpic->p[i_index].i_pitch;
171 vlc_memset( p_out + i_offset, black_pixel, -i_offset );
175 vlc_memcpy( p_out + i_offset, p_in,
176 i_visible_pitch - i_offset );
177 vlc_memset( p_out, black_pixel, i_offset );
178 p_in += p_pic->p[i_index].i_pitch;
179 p_out += p_outpic->p[i_index].i_pitch;
184 vlc_memcpy( p_out, p_in, i_visible_pitch );
185 p_in += p_pic->p[i_index].i_pitch;
186 p_out += p_outpic->p[i_index].i_pitch;
192 return CopyInfoAndRelease( p_outpic, p_pic );