modules/video_filter/psychedelic.c

   1 /*****************************************************************************
   2  * Psychedelic.c : Psychedelic 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 #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
  38 #include <vlc_filter.h>
  39 #include <vlc_image.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_("Psychedelic video filter") )
  55     set_shortname( N_( "Psychedelic" ))
  56     set_capability( "video filter2", 0 )
  57     set_category( CAT_VIDEO )
  58     set_subcategory( SUBCAT_VIDEO_VFILTER )
  59
  60     add_shortcut( "psychedelic" )
  61     set_callbacks( Create, Destroy )
  62 vlc_module_end ()
  63
  64 /*****************************************************************************
  65  * filter_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     image_handler_t *p_image;
  73     unsigned int x, y, scale;
  74     int xinc, yinc, scaleinc;
  75     uint8_t u,v;
  76 };
  77
  78 /*****************************************************************************
  79  * Create: allocates Distort video thread output method
  80  *****************************************************************************
  81  * This function allocates and initializes a Distort vout method.
  82  *****************************************************************************/
  83 static int Create( vlc_object_t *p_this )
  84 {
  85     filter_t *p_filter = (filter_t *)p_this;
  86
  87     /* Allocate structure */
  88     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  89     if( p_filter->p_sys == NULL )
  90         return VLC_ENOMEM;
  91
  92     p_filter->pf_video_filter = Filter;
  93
  94     p_filter->p_sys->x = 10;
  95     p_filter->p_sys->y = 10;
  96     p_filter->p_sys->scale = 1;
  97     p_filter->p_sys->xinc = 1;
  98     p_filter->p_sys->yinc = 1;
  99     p_filter->p_sys->scaleinc = 1;
 100     p_filter->p_sys->u = 0;
 101     p_filter->p_sys->v = 0;
 102     p_filter->p_sys->p_image = NULL;
 103
 104     return VLC_SUCCESS;
 105 }
 106
 107 /*****************************************************************************
 108  * Destroy: destroy Distort video thread output method
 109  *****************************************************************************
 110  * Terminate an output method created by DistortCreateOutputMethod
 111  *****************************************************************************/
 112 static void Destroy( vlc_object_t *p_this )
 113 {
 114     filter_t *p_filter = (filter_t *)p_this;
 115
 116     if( p_filter->p_sys->p_image )
 117         image_HandlerDelete( p_filter->p_sys->p_image );
 118     p_filter->p_sys->p_image = NULL;
 119
 120     free( p_filter->p_sys );
 121 }
 122
 123 /*****************************************************************************
 124  * Render: displays previously rendered output
 125  *****************************************************************************
 126  * This function send the currently rendered image to Distort image, waits
 127  * until it is displayed and switch the two rendering buffers, preparing next
 128  * frame.
 129  *****************************************************************************/
 130 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 131 {
 132     picture_t *p_outpic;
 133
 134     unsigned int w, h;
 135     int x,y;
 136     uint8_t u,v;
 137
 138     picture_t *p_converted;
 139     video_format_t fmt_out;
 140     memset( &fmt_out, 0, sizeof(video_format_t) );
 141     fmt_out.p_palette = NULL;
 142
 143     if( !p_pic ) return NULL;
 144
 145     p_outpic = filter_NewPicture( p_filter );
 146     if( !p_outpic )
 147     {
 148         picture_Release( p_pic );
 149         return NULL;
 150     }
 151
 152     if( !p_filter->p_sys->p_image )
 153         p_filter->p_sys->p_image = image_HandlerCreate( p_filter );
 154
 155     /* chrominance */
 156     u = p_filter->p_sys->u;
 157     v = p_filter->p_sys->v;
 158     for( y = 0; y<p_outpic->p[U_PLANE].i_lines; y++)
 159     {
 160         vlc_memset(
 161                 p_outpic->p[U_PLANE].p_pixels+y*p_outpic->p[U_PLANE].i_pitch,
 162                 u, p_outpic->p[U_PLANE].i_pitch );
 163         vlc_memset(
 164                 p_outpic->p[V_PLANE].p_pixels+y*p_outpic->p[V_PLANE].i_pitch,
 165                 v, p_outpic->p[V_PLANE].i_pitch );
 166         if( v == 0 && u != 0 )
 167             u --;
 168         else if( u == 0xff )
 169             v --;
 170         else if( v == 0xff )
 171             u ++;
 172         else if( u == 0 )
 173             v ++;
 174     }
 175
 176     /* luminance */
 177     plane_CopyPixels( &p_outpic->p[Y_PLANE], &p_pic->p[Y_PLANE] );
 178
 179     /* image visualization */
 180     fmt_out = p_filter->fmt_out.video;
 181     fmt_out.i_width = p_filter->fmt_out.video.i_width*p_filter->p_sys->scale/150;
 182     fmt_out.i_height = p_filter->fmt_out.video.i_height*p_filter->p_sys->scale/150;
 183     p_converted = image_Convert( p_filter->p_sys->p_image, p_pic,
 184                                  &(p_pic->format), &fmt_out );
 185
 186     if( p_converted )
 187     {
 188 #define copyimage( plane, b ) \
 189         for( y=0; y<p_converted->p[plane].i_visible_lines; y++) { \
 190         for( x=0; x<p_converted->p[plane].i_visible_pitch; x++) { \
 191             int nx, ny; \
 192             if( p_filter->p_sys->yinc == 1 ) \
 193                 ny= y; \
 194             else \
 195                 ny = p_converted->p[plane].i_visible_lines-y; \
 196             if( p_filter->p_sys->xinc == 1 ) \
 197                 nx = x; \
 198             else \
 199                 nx = p_converted->p[plane].i_visible_pitch-x; \
 200             p_outpic->p[plane].p_pixels[(p_filter->p_sys->x*b+nx)+(ny+p_filter->p_sys->y*b)*p_outpic->p[plane].i_pitch ] = p_converted->p[plane].p_pixels[y*p_converted->p[plane].i_pitch+x]; \
 201         } }
 202         copyimage( Y_PLANE, 2 );
 203         copyimage( U_PLANE, 1 );
 204         copyimage( V_PLANE, 1 );
 205 #undef copyimage
 206
 207         picture_Release( p_converted );
 208     }
 209     else
 210     {
 211         msg_Err( p_filter, "Image scaling failed miserably." );
 212     }
 213
 214     p_filter->p_sys->x += p_filter->p_sys->xinc;
 215     p_filter->p_sys->y += p_filter->p_sys->yinc;
 216
 217     p_filter->p_sys->scale += p_filter->p_sys->scaleinc;
 218     if( p_filter->p_sys->scale >= 50 ) p_filter->p_sys->scaleinc = -1;
 219     if( p_filter->p_sys->scale <= 1 ) p_filter->p_sys->scaleinc = 1;
 220
 221     w = p_filter->fmt_out.video.i_width*p_filter->p_sys->scale/150;
 222     h = p_filter->fmt_out.video.i_height*p_filter->p_sys->scale/150;
 223     if( p_filter->p_sys->x*2 + w >= p_filter->fmt_out.video.i_width )
 224         p_filter->p_sys->xinc = -1;
 225     if( p_filter->p_sys->x <= 0 )
 226         p_filter->p_sys->xinc = 1;
 227
 228     if( p_filter->p_sys->x*2 + w >= p_filter->fmt_out.video.i_width )
 229         p_filter->p_sys->x = (p_filter->fmt_out.video.i_width-w)/2;
 230     if( p_filter->p_sys->y*2 + h >= p_filter->fmt_out.video.i_height )
 231         p_filter->p_sys->y = (p_filter->fmt_out.video.i_height-h)/2;
 232
 233     if( p_filter->p_sys->y*2 + h >= p_filter->fmt_out.video.i_height )
 234         p_filter->p_sys->yinc = -1;
 235     if( p_filter->p_sys->y <= 0 )
 236         p_filter->p_sys->yinc = 1;
 237
 238     for( y = 0; y< 16; y++ )
 239     {
 240         if( p_filter->p_sys->v == 0 && p_filter->p_sys->u != 0 )
 241             p_filter->p_sys->u -= 1;
 242         else if( p_filter->p_sys->u == 0xff )
 243             p_filter->p_sys->v -= 1;
 244         else if( p_filter->p_sys->v == 0xff )
 245             p_filter->p_sys->u += 1;
 246         else if( p_filter->p_sys->u == 0 )
 247             p_filter->p_sys->v += 1;
 248     }
 249
 250     return CopyInfoAndRelease( p_outpic, p_pic );
 251 }