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 #ifdef HAVE_CONFIG_H
  32 # include "config.h"
  33 #endif
  34
  35 #include <vlc/vlc.h>
  36 #include <vlc_vout.h>
  37 #include <vlc_filter.h>
  38
  39 /*****************************************************************************
  40  * Local prototypes
  41  *****************************************************************************/
  42 static int  Create    ( vlc_object_t * );
  43 static void Destroy   ( vlc_object_t * );
  44
  45 static picture_t *Filter( filter_t *, picture_t * );
  46
  47 /*****************************************************************************
  48  * Module descriptor
  49  *****************************************************************************/
  50 vlc_module_begin();
  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 );
  56
  57     add_shortcut( "ripple" );
  58     set_callbacks( Create, Destroy );
  59 vlc_module_end();
  60
  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  *****************************************************************************/
  67 struct filter_sys_t
  68 {
  69     double  f_angle;
  70     mtime_t last_date;
  71 };
  72
  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 )
  79 {
  80     filter_t *p_filter = (filter_t *)p_this;
  81
  82     /* Allocate structure */
  83     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  84     if( p_filter->p_sys == NULL )
  85     {
  86         msg_Err( p_filter, "out of memory" );
  87         return VLC_ENOMEM;
  88     }
  89
  90     p_filter->pf_video_filter = Filter;
  91
  92     p_filter->p_sys->f_angle = 0.0;
  93     p_filter->p_sys->last_date = 0;
  94
  95     return VLC_SUCCESS;
  96 }
  97
  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 )
 104 {
 105     filter_t *p_filter = (filter_t *)p_this;
 106     free( p_filter->p_sys );
 107 }
 108
 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
 114  * frame.
 115  *****************************************************************************/
 116 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 117 {
 118     picture_t *p_outpic;
 119     int i_index;
 120     double f_angle;
 121     mtime_t new_date = mdate();
 122
 123     if( !p_pic ) return NULL;
 124
 125     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 126     if( !p_outpic )
 127     {
 128         msg_Warn( p_filter, "can't get output picture" );
 129         if( p_pic->pf_release )
 130             p_pic->pf_release( p_pic );
 131         return NULL;
 132     }
 133
 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;
 137
 138     for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
 139     {
 140         int i_line, i_first_line, i_num_lines, i_offset, i_pixel_pitch,
 141             i_visible_pixels;
 142         uint8_t black_pixel;
 143         uint8_t *p_in, *p_out;
 144
 145         black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
 146
 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;
 150
 151         i_first_line = i_num_lines * 4 / 5;
 152
 153         p_in = p_pic->p[i_index].p_pixels;
 154         p_out = p_outpic->p[i_index].p_pixels;
 155
 156         for( i_line = 0 ; i_line < i_first_line ; i_line++ )
 157         {
 158             vlc_memcpy( p_out, p_in, p_pic->p[i_index].i_visible_pitch );
 159             p_in += p_pic->p[i_index].i_pitch;
 160             p_out += p_outpic->p[i_index].i_pitch;
 161         }
 162
 163         /* Ok, we do 3 times the sin() calculation for each line. So what ? */
 164         for( i_line = i_first_line ; i_line < i_num_lines ; i_line++ )
 165         {
 166             /* Calculate today's offset, don't go above 1/20th of the screen */
 167             i_offset = (int)( (double)(i_visible_pixels)
 168                          * sin( f_angle + 2.0 * (double)i_line
 169                                               / (double)( 1 + i_line
 170                                                             - i_first_line) )
 171                          * (double)(i_line - i_first_line)
 172                          / (double)i_num_lines
 173                          / 8.0 )*p_pic->p[i_index].i_pixel_pitch;
 174
 175             if( i_offset )
 176             {
 177                 if( i_offset < 0 )
 178                 {
 179                     vlc_memcpy( p_out, p_in - i_offset,
 180                                 p_pic->p[i_index].i_visible_pitch + i_offset );
 181                     p_in -= p_pic->p[i_index].i_pitch;
 182                     p_out += p_outpic->p[i_index].i_pitch;
 183                     vlc_memset( p_out + i_offset, black_pixel, -i_offset );
 184                 }
 185                 else
 186                 {
 187                     vlc_memcpy( p_out + i_offset, p_in,
 188                                 p_pic->p[i_index].i_visible_pitch - i_offset );
 189                     vlc_memset( p_out, black_pixel, i_offset );
 190                     p_in -= p_pic->p[i_index].i_pitch;
 191                     p_out += p_outpic->p[i_index].i_pitch;
 192                 }
 193             }
 194             else
 195             {
 196                 vlc_memcpy( p_out, p_in, p_pic->p[i_index].i_visible_pitch );
 197                 p_in -= p_pic->p[i_index].i_pitch;
 198                 p_out += p_outpic->p[i_index].i_pitch;
 199             }
 200
 201         }
 202     }
 203
 204     p_outpic->date = p_pic->date;
 205     p_outpic->b_force = p_pic->b_force;
 206     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 207     p_outpic->b_progressive = p_pic->b_progressive;
 208     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 209
 210     if( p_pic->pf_release )
 211         p_pic->pf_release( p_pic );
 212
 213     return p_outpic;
 214 }