modules/video_filter/wave.c

   1 /*****************************************************************************
   2  * wave.c : Wave video effect plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000-2008 VLC authors and VideoLAN
   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 it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * 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_filter.h>
  38 #include <vlc_picture.h>
  39 #include "filter_picture.h"
  40
  41 /*****************************************************************************
  42  * Local prototypes
  43  *****************************************************************************/
  44 static int  Create    ( vlc_object_t * );
  45 static void Destroy   ( vlc_object_t * );
  46
  47 static picture_t *Filter( filter_t *, picture_t * );
  48
  49 /*****************************************************************************
  50  * Module descriptor
  51  *****************************************************************************/
  52 vlc_module_begin ()
  53     set_description( N_("Wave video filter") )
  54     set_shortname( N_( "Wave" ))
  55     set_capability( "video filter", 0 )
  56     set_category( CAT_VIDEO )
  57     set_subcategory( SUBCAT_VIDEO_VFILTER )
  58
  59     add_shortcut( "wave" )
  60     set_callbacks( Create, Destroy )
  61 vlc_module_end ()
  62
  63 /*****************************************************************************
  64  * filter_sys_t: Distort video output method descriptor
  65  *****************************************************************************
  66  * This structure is part of the video output thread descriptor.
  67  * It describes the Distort specific properties of an output thread.
  68  *****************************************************************************/
  69 struct filter_sys_t
  70 {
  71     double  f_angle;
  72     mtime_t last_date;
  73 };
  74
  75 /*****************************************************************************
  76  * Create: allocates Distort video thread output method
  77  *****************************************************************************
  78  * This function allocates and initializes a Distort vout method.
  79  *****************************************************************************/
  80 static int Create( vlc_object_t *p_this )
  81 {
  82     filter_t *p_filter = (filter_t *)p_this;
  83
  84     const vlc_chroma_description_t *p_chroma =
  85         vlc_fourcc_GetChromaDescription( p_filter->fmt_in.video.i_chroma );
  86     if( p_chroma == NULL || p_chroma->plane_count == 0 )
  87         return VLC_EGENERIC;
  88
  89     /* Allocate structure */
  90     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  91     if( p_filter->p_sys == NULL )
  92         return VLC_ENOMEM;
  93
  94     p_filter->pf_video_filter = Filter;
  95
  96     p_filter->p_sys->f_angle = 0.0;
  97     p_filter->p_sys->last_date = 0;
  98
  99     return VLC_SUCCESS;
 100 }
 101
 102 /*****************************************************************************
 103  * Destroy: destroy Distort video thread output method
 104  *****************************************************************************
 105  * Terminate an output method created by DistortCreateOutputMethod
 106  *****************************************************************************/
 107 static void Destroy( vlc_object_t *p_this )
 108 {
 109     filter_t *p_filter = (filter_t *)p_this;
 110     free( p_filter->p_sys );
 111 }
 112
 113 /*****************************************************************************
 114  * Render: displays previously rendered output
 115  *****************************************************************************
 116  * This function send the currently rendered image to Distort image, waits
 117  * until it is displayed and switch the two rendering buffers, preparing next
 118  * frame.
 119  *****************************************************************************/
 120 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 121 {
 122     picture_t *p_outpic;
 123     double f_angle;
 124     mtime_t new_date = mdate();
 125
 126     if( !p_pic ) return NULL;
 127
 128     p_outpic = filter_NewPicture( p_filter );
 129     if( !p_outpic )
 130     {
 131         picture_Release( p_pic );
 132         return NULL;
 133     }
 134
 135     p_filter->p_sys->f_angle += (new_date - p_filter->p_sys->last_date) / 200000.0;
 136     p_filter->p_sys->last_date = new_date;
 137     f_angle = p_filter->p_sys->f_angle;
 138
 139     for( int i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
 140     {
 141         int i_num_lines, i_visible_pitch, i_pixel_pitch, i_offset,
 142             i_visible_pixels;
 143         uint8_t black_pixel;
 144         uint8_t *p_in, *p_out;
 145
 146         p_in = p_pic->p[i_index].p_pixels;
 147         p_out = p_outpic->p[i_index].p_pixels;
 148
 149         i_num_lines = p_pic->p[i_index].i_visible_lines;
 150         i_visible_pitch = p_pic->p[i_index].i_visible_pitch;
 151         i_pixel_pitch = p_pic->p[i_index].i_pixel_pitch;
 152         switch( p_filter->fmt_in.video.i_chroma )
 153         {
 154             CASE_PACKED_YUV_422
 155                 // Quick hack to fix u/v inversion occuring with 2 byte pixel pitch
 156                 i_pixel_pitch *= 2;
 157                 break;
 158         }
 159         i_visible_pixels = i_visible_pitch/i_pixel_pitch;
 160
 161         black_pixel = ( p_pic->i_planes > 1 && i_index == Y_PLANE ) ? 0x00
 162                                                                     : 0x80;
 163
 164         /* Ok, we do 3 times the sin() calculation for each line. So what ? */
 165         for( int i_line = 0 ; i_line < i_num_lines ; i_line++ )
 166         {
 167             /* Calculate today's offset, don't go above 1/20th of the screen */
 168             i_offset = (int)( (double)(i_visible_pixels)
 169                          * sin( f_angle + 10.0 * (double)i_line
 170                                                / (double)i_num_lines )
 171                          / 20.0 )*i_pixel_pitch;
 172
 173             if( i_offset )
 174             {
 175                 if( i_offset < 0 )
 176                 {
 177                     memcpy( p_out, p_in - i_offset,
 178                                 i_visible_pitch + i_offset );
 179                     p_in += p_pic->p[i_index].i_pitch;
 180                     p_out += p_outpic->p[i_index].i_pitch;
 181                     memset( p_out + i_offset, black_pixel, -i_offset );
 182                 }
 183                 else
 184                 {
 185                     memcpy( p_out + i_offset, p_in,
 186                                 i_visible_pitch - i_offset );
 187                     memset( p_out, black_pixel, i_offset );
 188                     p_in += p_pic->p[i_index].i_pitch;
 189                     p_out += p_outpic->p[i_index].i_pitch;
 190                 }
 191             }
 192             else
 193             {
 194                 memcpy( p_out, p_in, 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     return CopyInfoAndRelease( p_outpic, p_pic );
 203 }