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) 2000-2008 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 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <math.h>                                            /* sin(), cos() */
  34
  35 #include <vlc_common.h>
  36 #include <vlc_plugin.h>
  37 #include <vlc_vout.h>
  38
  39 #include "vlc_filter.h"
  40 #include "filter_picture.h"
  41
  42 /*****************************************************************************
  43  * Local prototypes
  44  *****************************************************************************/
  45 static int  Create    ( vlc_object_t * );
  46 static void Destroy   ( vlc_object_t * );
  47
  48 static picture_t *Filter( filter_t *, picture_t * );
  49
  50 /*****************************************************************************
  51  * Module descriptor
  52  *****************************************************************************/
  53 vlc_module_begin ()
  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 )
  59
  60     add_shortcut( "wave" )
  61     set_callbacks( Create, Destroy )
  62 vlc_module_end ()
  63
  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  *****************************************************************************/
  70 struct filter_sys_t
  71 {
  72     double  f_angle;
  73     mtime_t last_date;
  74 };
  75
  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 )
  82 {
  83     filter_t *p_filter = (filter_t *)p_this;
  84
  85     /* Allocate structure */
  86     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  87     if( p_filter->p_sys == NULL )
  88         return VLC_ENOMEM;
  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 = filter_NewPicture( p_filter );
 126     if( !p_outpic )
 127     {
 128         picture_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_visible_pitch, i_pixel_pitch, i_offset,
 139             i_visible_pixels;
 140         uint8_t black_pixel;
 141         uint8_t *p_in, *p_out;
 142
 143         p_in = p_pic->p[i_index].p_pixels;
 144         p_out = p_outpic->p[i_index].p_pixels;
 145
 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;
 150
 151         black_pixel = ( p_pic->i_planes > 1 && i_index == Y_PLANE ) ? 0x00
 152                                                                     : 0x80;
 153
 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++ )
 156         {
 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;
 162
 163             if( i_offset )
 164             {
 165                 if( i_offset < 0 )
 166                 {
 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 );
 172                 }
 173                 else
 174                 {
 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;
 180                 }
 181             }
 182             else
 183             {
 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;
 187             }
 188
 189         }
 190     }
 191
 192     return CopyInfoAndRelease( p_outpic, p_pic );
 193 }