git.sesse.net Git - vlc/blob - modules/video_filter/wave.c

   1 /*****************************************************************************
   2  * wave.c : Wave video effect plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000-2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *          Antoine Cellerier <dionoea -at- videolan -dot- org>
   9  *
  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.
  14  *
  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.
  19  *
  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  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <string.h>
  29
  30 #include <math.h>                                            /* sin(), cos() */
  31
  32 #include <vlc/vlc.h>
  33 #include <vlc_vout.h>
  34
  35 #include "vlc_filter.h"
  36
  37 /*****************************************************************************
  38  * Local prototypes
  39  *****************************************************************************/
  40 static int  Create    ( vlc_object_t * );
  41 static void Destroy   ( vlc_object_t * );
  42
  43 static picture_t *Filter( filter_t *, picture_t * );
  44
  45 /*****************************************************************************
  46  * Module descriptor
  47  *****************************************************************************/
  48 vlc_module_begin();
  49     set_description( _("Wave video filter") );
  50     set_shortname( _( "Wave" ));
  51     set_capability( "video filter2", 0 );
  52     set_category( CAT_VIDEO );
  53     set_subcategory( SUBCAT_VIDEO_VFILTER );
  54
  55     add_shortcut( "wave" );
  56     set_callbacks( Create, Destroy );
  57 vlc_module_end();
  58
  59 /*****************************************************************************
  60  * vout_sys_t: Distort video output method descriptor
  61  *****************************************************************************
  62  * This structure is part of the video output thread descriptor.
  63  * It describes the Distort specific properties of an output thread.
  64  *****************************************************************************/
  65 struct filter_sys_t
  66 {
  67     double  f_angle;
  68     mtime_t last_date;
  69 };
  70
  71 /*****************************************************************************
  72  * Create: allocates Distort video thread output method
  73  *****************************************************************************
  74  * This function allocates and initializes a Distort vout method.
  75  *****************************************************************************/
  76 static int Create( vlc_object_t *p_this )
  77 {
  78     filter_t *p_filter = (filter_t *)p_this;
  79
  80     /* Allocate structure */
  81     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  82     if( p_filter->p_sys == NULL )
  83     {
  84         msg_Err( p_filter, "out of memory" );
  85         return VLC_ENOMEM;
  86     }
  87
  88     p_filter->pf_video_filter = Filter;
  89
  90     p_filter->p_sys->f_angle = 0.0;
  91     p_filter->p_sys->last_date = 0;
  92
  93     return VLC_SUCCESS;
  94 }
  95
  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 )
 102 {
 103     filter_t *p_filter = (filter_t *)p_this;
 104     free( p_filter->p_sys );
 105 }
 106
 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
 112  * frame.
 113  *****************************************************************************/
 114 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 115 {
 116     picture_t *p_outpic;
 117     int i_index;
 118     double f_angle;
 119     mtime_t new_date = mdate();
 120
 121     if( !p_pic ) return NULL;
 122
 123     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 124     if( !p_outpic )
 125     {
 126         msg_Warn( p_filter, "can't get output picture" );
 127         if( p_pic->pf_release )
 128             p_pic->pf_release( p_pic );
 129         return NULL;
 130     }
 131
 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;
 135
 136     for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
 137     {
 138         int i_line, i_num_lines, i_offset;
 139         uint8_t black_pixel;
 140         uint8_t *p_in, *p_out;
 141
 142         p_in = p_pic->p[i_index].p_pixels;
 143         p_out = p_outpic->p[i_index].p_pixels;
 144
 145         i_num_lines = p_pic->p[i_index].i_visible_lines;
 146
 147         black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
 148
 149         /* Ok, we do 3 times the sin() calculation for each line. So what ? */
 150         for( i_line = 0 ; i_line < i_num_lines ; i_line++ )
 151         {
 152             /* Calculate today's offset, don't go above 1/20th of the screen */
 153             i_offset = (int)( (double)(p_pic->p[i_index].i_visible_pitch)
 154                          * sin( f_angle + 10.0 * (double)i_line
 155                                                / (double)i_num_lines )
 156                          / 20.0 );
 157
 158             if( i_offset )
 159             {
 160                 if( i_offset < 0 )
 161                 {
 162                     p_filter->p_libvlc->pf_memcpy( p_out, p_in - i_offset,
 163                              p_pic->p[i_index].i_visible_pitch + i_offset );
 164                     p_in += p_pic->p[i_index].i_pitch;
 165                     p_out += p_outpic->p[i_index].i_pitch;
 166                     p_filter->p_libvlc->pf_memset( p_out + i_offset,
 167                                                    black_pixel, -i_offset );
 168                 }
 169                 else
 170                 {
 171                     p_filter->p_libvlc->pf_memcpy( p_out + i_offset, p_in,
 172                              p_pic->p[i_index].i_visible_pitch - i_offset );
 173                     p_filter->p_libvlc->pf_memset( p_out, black_pixel,
 174                                                    i_offset );
 175                     p_in += p_pic->p[i_index].i_pitch;
 176                     p_out += p_outpic->p[i_index].i_pitch;
 177                 }
 178             }
 179             else
 180             {
 181                 p_filter->p_libvlc->pf_memcpy( p_out, p_in,
 182                                           p_pic->p[i_index].i_visible_pitch );
 183                 p_in += p_pic->p[i_index].i_pitch;
 184                 p_out += p_outpic->p[i_index].i_pitch;
 185             }
 186
 187         }
 188     }
 189
 190     p_outpic->date = p_pic->date;
 191     p_outpic->b_force = p_pic->b_force;
 192     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 193     p_outpic->b_progressive = p_pic->b_progressive;
 194     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 195
 196     if( p_pic->pf_release )
 197         p_pic->pf_release( p_pic );
 198
 199     return p_outpic;
 200 }