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 <stdlib.h>                                      /* malloc(), free() */
  29 #include <string.h>
  30
  31 #include <math.h>                                            /* sin(), cos() */
  32
  33 #include <vlc/vlc.h>
  34 #include <vlc_vout.h>
  35
  36 #include "vlc_filter.h"
  37
  38 /*****************************************************************************
  39  * Local prototypes
  40  *****************************************************************************/
  41 static int  Create    ( vlc_object_t * );
  42 static void Destroy   ( vlc_object_t * );
  43
  44 static picture_t *Filter( filter_t *, picture_t * );
  45
  46 /*****************************************************************************
  47  * Module descriptor
  48  *****************************************************************************/
  49 vlc_module_begin();
  50     set_description( _("Wave video filter") );
  51     set_shortname( _( "Wave" ));
  52     set_capability( "video filter2", 0 );
  53     set_category( CAT_VIDEO );
  54     set_subcategory( SUBCAT_VIDEO_VFILTER );
  55
  56     add_shortcut( "wave" );
  57     set_callbacks( Create, Destroy );
  58 vlc_module_end();
  59
  60 /*****************************************************************************
  61  * vout_sys_t: Distort video output method descriptor
  62  *****************************************************************************
  63  * This structure is part of the video output thread descriptor.
  64  * It describes the Distort specific properties of an output thread.
  65  *****************************************************************************/
  66 struct filter_sys_t
  67 {
  68     double  f_angle;
  69     mtime_t last_date;
  70 };
  71
  72 /*****************************************************************************
  73  * Create: allocates Distort video thread output method
  74  *****************************************************************************
  75  * This function allocates and initializes a Distort vout method.
  76  *****************************************************************************/
  77 static int Create( vlc_object_t *p_this )
  78 {
  79     filter_t *p_filter = (filter_t *)p_this;
  80
  81     /* Allocate structure */
  82     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  83     if( p_filter->p_sys == NULL )
  84     {
  85         msg_Err( p_filter, "out of memory" );
  86         return VLC_ENOMEM;
  87     }
  88
  89     p_filter->pf_video_filter = Filter;
  90
  91     p_filter->p_sys->f_angle = 0.0;
  92     p_filter->p_sys->last_date = 0;
  93
  94     return VLC_SUCCESS;
  95 }
  96
  97 /*****************************************************************************
  98  * Destroy: destroy Distort video thread output method
  99  *****************************************************************************
 100  * Terminate an output method created by DistortCreateOutputMethod
 101  *****************************************************************************/
 102 static void Destroy( vlc_object_t *p_this )
 103 {
 104     filter_t *p_filter = (filter_t *)p_this;
 105     free( p_filter->p_sys );
 106 }
 107
 108 /*****************************************************************************
 109  * Render: displays previously rendered output
 110  *****************************************************************************
 111  * This function send the currently rendered image to Distort image, waits
 112  * until it is displayed and switch the two rendering buffers, preparing next
 113  * frame.
 114  *****************************************************************************/
 115 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 116 {
 117     picture_t *p_outpic;
 118     int i_index;
 119     double f_angle;
 120     mtime_t new_date = mdate();
 121
 122     if( !p_pic ) return NULL;
 123
 124     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 125     if( !p_outpic )
 126     {
 127         msg_Warn( p_filter, "can't get output picture" );
 128         if( p_pic->pf_release )
 129             p_pic->pf_release( p_pic );
 130         return NULL;
 131     }
 132
 133     p_filter->p_sys->f_angle += (new_date - p_filter->p_sys->last_date) / 200000.0;
 134     p_filter->p_sys->last_date = new_date;
 135     f_angle = p_filter->p_sys->f_angle;
 136
 137     for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
 138     {
 139         int i_line, i_num_lines, i_offset;
 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
 148         black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
 149
 150         /* Ok, we do 3 times the sin() calculation for each line. So what ? */
 151         for( i_line = 0 ; i_line < i_num_lines ; i_line++ )
 152         {
 153             /* Calculate today's offset, don't go above 1/20th of the screen */
 154             i_offset = (int)( (double)(p_pic->p[i_index].i_visible_pitch)
 155                          * sin( f_angle + 10.0 * (double)i_line
 156                                                / (double)i_num_lines )
 157                          / 20.0 );
 158
 159             if( i_offset )
 160             {
 161                 if( i_offset < 0 )
 162                 {
 163                     p_filter->p_libvlc->pf_memcpy( p_out, p_in - i_offset,
 164                              p_pic->p[i_index].i_visible_pitch + i_offset );
 165                     p_in += p_pic->p[i_index].i_pitch;
 166                     p_out += p_outpic->p[i_index].i_pitch;
 167                     memset( p_out + i_offset, 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                     memset( p_out, black_pixel, i_offset );
 174                     p_in += p_pic->p[i_index].i_pitch;
 175                     p_out += p_outpic->p[i_index].i_pitch;
 176                 }
 177             }
 178             else
 179             {
 180                 p_filter->p_libvlc->pf_memcpy( p_out, p_in,
 181                                           p_pic->p[i_index].i_visible_pitch );
 182                 p_in += p_pic->p[i_index].i_pitch;
 183                 p_out += p_outpic->p[i_index].i_pitch;
 184             }
 185
 186         }
 187     }
 188
 189     p_outpic->date = p_pic->date;
 190     p_outpic->b_force = p_pic->b_force;
 191     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 192     p_outpic->b_progressive = p_pic->b_progressive;
 193     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 194
 195     if( p_pic->pf_release )
 196         p_pic->pf_release( p_pic );
 197
 198     return p_outpic;
 199 }