modules/video_filter/psychedelic.c

   1 /*****************************************************************************
   2  * psychedelic.c : Psychedelic video effect plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000-2006 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 <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 filter", 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     const vlc_fourcc_t fourcc = p_filter->fmt_in.video.i_chroma;
  88     const vlc_chroma_description_t *p_chroma = vlc_fourcc_GetChromaDescription( fourcc );
  89     if( !p_chroma || p_chroma->plane_count != 3 || p_chroma->pixel_size != 1 ) {
  90         msg_Err( p_filter, "Unsupported chroma (%4.4s)", (char*)&fourcc );
  91         return VLC_EGENERIC;
  92     }
  93
  94     /* Allocate structure */
  95     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
  96     if( p_filter->p_sys == NULL )
  97         return VLC_ENOMEM;
  98
  99     p_filter->pf_video_filter = Filter;
 100
 101     p_filter->p_sys->x = 10;
 102     p_filter->p_sys->y = 10;
 103     p_filter->p_sys->scale = 1;
 104     p_filter->p_sys->xinc = 1;
 105     p_filter->p_sys->yinc = 1;
 106     p_filter->p_sys->scaleinc = 1;
 107     p_filter->p_sys->u = 0;
 108     p_filter->p_sys->v = 0;
 109     p_filter->p_sys->p_image = NULL;
 110
 111     return VLC_SUCCESS;
 112 }
 113
 114 /*****************************************************************************
 115  * Destroy: destroy Distort video thread output method
 116  *****************************************************************************
 117  * Terminate an output method created by DistortCreateOutputMethod
 118  *****************************************************************************/
 119 static void Destroy( vlc_object_t *p_this )
 120 {
 121     filter_t *p_filter = (filter_t *)p_this;
 122
 123     if( p_filter->p_sys->p_image )
 124         image_HandlerDelete( p_filter->p_sys->p_image );
 125     p_filter->p_sys->p_image = NULL;
 126
 127     free( p_filter->p_sys );
 128 }
 129
 130 /*****************************************************************************
 131  * Render: displays previously rendered output
 132  *****************************************************************************
 133  * This function send the currently rendered image to Distort image, waits
 134  * until it is displayed and switch the two rendering buffers, preparing next
 135  * frame.
 136  *****************************************************************************/
 137 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 138 {
 139     picture_t *p_outpic;
 140
 141     unsigned int w, h;
 142     uint8_t u,v;
 143
 144     picture_t *p_converted;
 145     video_format_t fmt_out;
 146
 147     if( !p_pic ) return NULL;
 148
 149     p_outpic = filter_NewPicture( p_filter );
 150     if( !p_outpic )
 151     {
 152         picture_Release( p_pic );
 153         return NULL;
 154     }
 155
 156     if( !p_filter->p_sys->p_image )
 157         p_filter->p_sys->p_image = image_HandlerCreate( p_filter );
 158
 159     /* chrominance */
 160     u = p_filter->p_sys->u;
 161     v = p_filter->p_sys->v;
 162     for( int y = 0; y < p_outpic->p[U_PLANE].i_lines; y++ )
 163     {
 164         memset(
 165                 p_outpic->p[U_PLANE].p_pixels+y*p_outpic->p[U_PLANE].i_pitch,
 166                 u, p_outpic->p[U_PLANE].i_pitch );
 167         memset(
 168                 p_outpic->p[V_PLANE].p_pixels+y*p_outpic->p[V_PLANE].i_pitch,
 169                 v, p_outpic->p[V_PLANE].i_pitch );
 170         if( v == 0 && u != 0 )
 171             u --;
 172         else if( u == 0xff )
 173             v --;
 174         else if( v == 0xff )
 175             u ++;
 176         else if( u == 0 )
 177             v ++;
 178     }
 179
 180     /* luminance */
 181     plane_CopyPixels( &p_outpic->p[Y_PLANE], &p_pic->p[Y_PLANE] );
 182
 183     /* image visualization */
 184     fmt_out = p_filter->fmt_out.video;
 185     fmt_out.i_width = p_filter->fmt_out.video.i_width*p_filter->p_sys->scale/150;
 186     fmt_out.i_height = p_filter->fmt_out.video.i_height*p_filter->p_sys->scale/150;
 187     fmt_out.i_visible_width = fmt_out.i_width;
 188     fmt_out.i_visible_height = fmt_out.i_height;
 189     p_converted = image_Convert( p_filter->p_sys->p_image, p_pic,
 190                                  &(p_pic->format), &fmt_out );
 191
 192     if( p_converted )
 193     {
 194 #define copyimage( plane, b ) \
 195         for( int y = 0; y<p_converted->p[plane].i_visible_lines; y++ ) { \
 196         for( int x = 0; x<p_converted->p[plane].i_visible_pitch; x++ ) { \
 197             int nx, ny; \
 198             if( p_filter->p_sys->yinc == 1 ) \
 199                 ny= y; \
 200             else \
 201                 ny = p_converted->p[plane].i_visible_lines-y; \
 202             if( p_filter->p_sys->xinc == 1 ) \
 203                 nx = x; \
 204             else \
 205                 nx = p_converted->p[plane].i_visible_pitch-x; \
 206             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]; \
 207         } }
 208         copyimage( Y_PLANE, 2 );
 209         copyimage( U_PLANE, 1 );
 210         copyimage( V_PLANE, 1 );
 211 #undef copyimage
 212
 213         picture_Release( p_converted );
 214     }
 215     else
 216     {
 217         msg_Err( p_filter, "Image scaling failed miserably." );
 218     }
 219
 220     p_filter->p_sys->x += p_filter->p_sys->xinc;
 221     p_filter->p_sys->y += p_filter->p_sys->yinc;
 222
 223     p_filter->p_sys->scale += p_filter->p_sys->scaleinc;
 224     if( p_filter->p_sys->scale >= 50 ) p_filter->p_sys->scaleinc = -1;
 225     if( p_filter->p_sys->scale <= 1 ) p_filter->p_sys->scaleinc = 1;
 226
 227     w = p_filter->fmt_out.video.i_width*p_filter->p_sys->scale/150;
 228     h = p_filter->fmt_out.video.i_height*p_filter->p_sys->scale/150;
 229     if( p_filter->p_sys->x*2 + w >= p_filter->fmt_out.video.i_width )
 230         p_filter->p_sys->xinc = -1;
 231     if( p_filter->p_sys->x <= 0 )
 232         p_filter->p_sys->xinc = 1;
 233
 234     if( p_filter->p_sys->x*2 + w >= p_filter->fmt_out.video.i_width )
 235         p_filter->p_sys->x = (p_filter->fmt_out.video.i_width-w)/2;
 236     if( p_filter->p_sys->y*2 + h >= p_filter->fmt_out.video.i_height )
 237         p_filter->p_sys->y = (p_filter->fmt_out.video.i_height-h)/2;
 238
 239     if( p_filter->p_sys->y*2 + h >= p_filter->fmt_out.video.i_height )
 240         p_filter->p_sys->yinc = -1;
 241     if( p_filter->p_sys->y <= 0 )
 242         p_filter->p_sys->yinc = 1;
 243
 244     for( int y = 0; y < 16; y++ )
 245     {
 246         if( p_filter->p_sys->v == 0 && p_filter->p_sys->u != 0 )
 247             p_filter->p_sys->u -= 1;
 248         else if( p_filter->p_sys->u == 0xff )
 249             p_filter->p_sys->v -= 1;
 250         else if( p_filter->p_sys->v == 0xff )
 251             p_filter->p_sys->u += 1;
 252         else if( p_filter->p_sys->u == 0 )
 253             p_filter->p_sys->v += 1;
 254     }
 255
 256     return CopyInfoAndRelease( p_outpic, p_pic );
 257 }