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 #include <string.h>
  29
  30 #include <math.h>                                            /* sin(), cos() */
  31
  32 #include <vlc/vlc.h>
  33 #include <vlc_vout.h>
  34 #include <vlc_filter.h>
  35
  36 /*****************************************************************************
  37  * Local prototypes
  38  *****************************************************************************/
  39 static int  Create    ( vlc_object_t * );
  40 static void Destroy   ( vlc_object_t * );
  41
  42 static picture_t *Filter( filter_t *, picture_t * );
  43
  44 /*****************************************************************************
  45  * Module descriptor
  46  *****************************************************************************/
  47 vlc_module_begin();
  48     set_description( _("Ripple video filter") );
  49     set_shortname( _( "Ripple" ));
  50     set_capability( "video filter2", 0 );
  51     set_category( CAT_VIDEO );
  52     set_subcategory( SUBCAT_VIDEO_VFILTER );
  53
  54     add_shortcut( "ripple" );
  55     set_callbacks( Create, Destroy );
  56 vlc_module_end();
  57
  58 /*****************************************************************************
  59  * vout_sys_t: Distort video output method descriptor
  60  *****************************************************************************
  61  * This structure is part of the video output thread descriptor.
  62  * It describes the Distort specific properties of an output thread.
  63  *****************************************************************************/
  64 struct filter_sys_t
  65 {
  66     double  f_angle;
  67     mtime_t last_date;
  68 };
  69
  70 /*****************************************************************************
  71  * Create: allocates Distort video thread output method
  72  *****************************************************************************
  73  * This function allocates and initializes a Distort vout method.
  74  *****************************************************************************/
  75 static int Create( vlc_object_t *p_this )
  76 {
  77     filter_t *p_filter = (filter_t *)p_this;
  78
  79     /* Allocate structure */
  80     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  81     if( p_filter->p_sys == NULL )
  82     {
  83         msg_Err( p_filter, "out of memory" );
  84         return VLC_ENOMEM;
  85     }
  86
  87     p_filter->pf_video_filter = Filter;
  88
  89     p_filter->p_sys->f_angle = 0.0;
  90     p_filter->p_sys->last_date = 0;
  91
  92     return VLC_SUCCESS;
  93 }
  94
  95 /*****************************************************************************
  96  * Destroy: destroy Distort video thread output method
  97  *****************************************************************************
  98  * Terminate an output method created by DistortCreateOutputMethod
  99  *****************************************************************************/
 100 static void Destroy( vlc_object_t *p_this )
 101 {
 102     filter_t *p_filter = (filter_t *)p_this;
 103     free( p_filter->p_sys );
 104 }
 105
 106 /*****************************************************************************
 107  * Render: displays previously rendered output
 108  *****************************************************************************
 109  * This function send the currently rendered image to Distort image, waits
 110  * until it is displayed and switch the two rendering buffers, preparing next
 111  * frame.
 112  *****************************************************************************/
 113 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 114 {
 115     picture_t *p_outpic;
 116     int i_index;
 117     double f_angle;
 118     mtime_t new_date = mdate();
 119
 120     if( !p_pic ) return NULL;
 121
 122     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 123     if( !p_outpic )
 124     {
 125         msg_Warn( p_filter, "can't get output picture" );
 126         if( p_pic->pf_release )
 127             p_pic->pf_release( p_pic );
 128         return NULL;
 129     }
 130
 131     p_filter->p_sys->f_angle -= (p_filter->p_sys->last_date - new_date) / 100000.0;
 132     p_filter->p_sys->last_date = new_date;
 133     f_angle = p_filter->p_sys->f_angle;
 134
 135     for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
 136     {
 137         int i_line, i_first_line, i_num_lines, i_offset;
 138         uint8_t black_pixel;
 139         uint8_t *p_in, *p_out;
 140
 141         black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
 142
 143         i_num_lines = p_pic->p[i_index].i_visible_lines;
 144
 145         i_first_line = i_num_lines * 4 / 5;
 146
 147         p_in = p_pic->p[i_index].p_pixels;
 148         p_out = p_outpic->p[i_index].p_pixels;
 149
 150         for( i_line = 0 ; i_line < i_first_line ; i_line++ )
 151         {
 152             p_filter->p_libvlc->pf_memcpy( p_out, p_in,
 153                                       p_pic->p[i_index].i_visible_pitch );
 154             p_in += p_pic->p[i_index].i_pitch;
 155             p_out += p_outpic->p[i_index].i_pitch;
 156         }
 157
 158         /* Ok, we do 3 times the sin() calculation for each line. So what ? */
 159         for( i_line = i_first_line ; i_line < i_num_lines ; i_line++ )
 160         {
 161             /* Calculate today's offset, don't go above 1/20th of the screen */
 162             i_offset = (int)( (double)(p_pic->p[i_index].i_pitch)
 163                          * sin( f_angle + 2.0 * (double)i_line
 164                                               / (double)( 1 + i_line
 165                                                             - i_first_line) )
 166                          * (double)(i_line - i_first_line)
 167                          / (double)i_num_lines
 168                          / 8.0 );
 169
 170             if( i_offset )
 171             {
 172                 if( i_offset < 0 )
 173                 {
 174                     p_filter->p_libvlc->pf_memcpy( p_out, p_in - i_offset,
 175                              p_pic->p[i_index].i_visible_pitch + i_offset );
 176                     p_in -= p_pic->p[i_index].i_pitch;
 177                     p_out += p_outpic->p[i_index].i_pitch;
 178                     p_filter->p_libvlc->pf_memset( p_out + i_offset,
 179                                                    black_pixel, -i_offset );
 180                 }
 181                 else
 182                 {
 183                     p_filter->p_libvlc->pf_memcpy( p_out + i_offset, p_in,
 184                              p_pic->p[i_index].i_visible_pitch - i_offset );
 185                     p_filter->p_libvlc->pf_memset( p_out, black_pixel,
 186                                                    i_offset );
 187                     p_in -= p_pic->p[i_index].i_pitch;
 188                     p_out += p_outpic->p[i_index].i_pitch;
 189                 }
 190             }
 191             else
 192             {
 193                 p_filter->p_libvlc->pf_memcpy( p_out, p_in,
 194                                           p_pic->p[i_index].i_visible_pitch );
 195                 p_in -= p_pic->p[i_index].i_pitch;
 196                 p_out += p_outpic->p[i_index].i_pitch;
 197             }
 198
 199         }
 200     }
 201
 202     p_outpic->date = p_pic->date;
 203     p_outpic->b_force = p_pic->b_force;
 204     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 205     p_outpic->b_progressive = p_pic->b_progressive;
 206     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 207
 208     if( p_pic->pf_release )
 209         p_pic->pf_release( p_pic );
 210
 211     return p_outpic;
 212 }