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

   1 /*****************************************************************************
   2  * ripple.c : Ripple 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
  29 #include <math.h>                                            /* sin(), cos() */
  30
  31 #include <vlc/vlc.h>
  32 #include <vlc_vout.h>
  33 #include <vlc_filter.h>
  34
  35 /*****************************************************************************
  36  * Local prototypes
  37  *****************************************************************************/
  38 static int  Create    ( vlc_object_t * );
  39 static void Destroy   ( vlc_object_t * );
  40
  41 static picture_t *Filter( filter_t *, picture_t * );
  42
  43 /*****************************************************************************
  44  * Module descriptor
  45  *****************************************************************************/
  46 vlc_module_begin();
  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 );
  52
  53     add_shortcut( "ripple" );
  54     set_callbacks( Create, Destroy );
  55 vlc_module_end();
  56
  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  *****************************************************************************/
  63 struct filter_sys_t
  64 {
  65     double  f_angle;
  66     mtime_t last_date;
  67 };
  68
  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 )
  75 {
  76     filter_t *p_filter = (filter_t *)p_this;
  77
  78     /* Allocate structure */
  79     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  80     if( p_filter->p_sys == NULL )
  81     {
  82         msg_Err( p_filter, "out of memory" );
  83         return VLC_ENOMEM;
  84     }
  85
  86     p_filter->pf_video_filter = Filter;
  87
  88     p_filter->p_sys->f_angle = 0.0;
  89     p_filter->p_sys->last_date = 0;
  90
  91     return VLC_SUCCESS;
  92 }
  93
  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 )
 100 {
 101     filter_t *p_filter = (filter_t *)p_this;
 102     free( p_filter->p_sys );
 103 }
 104
 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
 110  * frame.
 111  *****************************************************************************/
 112 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 113 {
 114     picture_t *p_outpic;
 115     int i_index;
 116     double f_angle;
 117     mtime_t new_date = mdate();
 118
 119     if( !p_pic ) return NULL;
 120
 121     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 122     if( !p_outpic )
 123     {
 124         msg_Warn( p_filter, "can't get output picture" );
 125         if( p_pic->pf_release )
 126             p_pic->pf_release( p_pic );
 127         return NULL;
 128     }
 129
 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;
 133
 134     for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
 135     {
 136         int i_line, i_first_line, i_num_lines, i_offset;
 137         uint8_t black_pixel;
 138         uint8_t *p_in, *p_out;
 139
 140         black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
 141
 142         i_num_lines = p_pic->p[i_index].i_visible_lines;
 143
 144         i_first_line = i_num_lines * 4 / 5;
 145
 146         p_in = p_pic->p[i_index].p_pixels;
 147         p_out = p_outpic->p[i_index].p_pixels;
 148
 149         for( i_line = 0 ; i_line < i_first_line ; i_line++ )
 150         {
 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;
 155         }
 156
 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++ )
 159         {
 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
 164                                                             - i_first_line) )
 165                          * (double)(i_line - i_first_line)
 166                          / (double)i_num_lines
 167                          / 8.0 );
 168
 169             if( i_offset )
 170             {
 171                 if( i_offset < 0 )
 172                 {
 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 );
 179                 }
 180                 else
 181                 {
 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,
 185                                                    i_offset );
 186                     p_in -= p_pic->p[i_index].i_pitch;
 187                     p_out += p_outpic->p[i_index].i_pitch;
 188                 }
 189             }
 190             else
 191             {
 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;
 196             }
 197
 198         }
 199     }
 200
 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;
 206
 207     if( p_pic->pf_release )
 208         p_pic->pf_release( p_pic );
 209
 210     return p_outpic;
 211 }