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
  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     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     int x,y;
 143     uint8_t u,v;
 144
 145     picture_t *p_converted;
 146     video_format_t fmt_out;
 147     memset( &fmt_out, 0, sizeof(video_format_t) );
 148     fmt_out.p_palette = NULL;
 149
 150     if( !p_pic ) return NULL;
 151
 152     p_outpic = filter_NewPicture( p_filter );
 153     if( !p_outpic )
 154     {
 155         picture_Release( p_pic );
 156         return NULL;
 157     }
 158
 159     if( !p_filter->p_sys->p_image )
 160         p_filter->p_sys->p_image = image_HandlerCreate( p_filter );
 161
 162     /* chrominance */
 163     u = p_filter->p_sys->u;
 164     v = p_filter->p_sys->v;
 165     for( y = 0; y<p_outpic->p[U_PLANE].i_lines; y++)
 166     {
 167         memset(
 168                 p_outpic->p[U_PLANE].p_pixels+y*p_outpic->p[U_PLANE].i_pitch,
 169                 u, p_outpic->p[U_PLANE].i_pitch );
 170         memset(
 171                 p_outpic->p[V_PLANE].p_pixels+y*p_outpic->p[V_PLANE].i_pitch,
 172                 v, p_outpic->p[V_PLANE].i_pitch );
 173         if( v == 0 && u != 0 )
 174             u --;
 175         else if( u == 0xff )
 176             v --;
 177         else if( v == 0xff )
 178             u ++;
 179         else if( u == 0 )
 180             v ++;
 181     }
 182
 183     /* luminance */
 184     plane_CopyPixels( &p_outpic->p[Y_PLANE], &p_pic->p[Y_PLANE] );
 185
 186     /* image visualization */
 187     fmt_out = p_filter->fmt_out.video;
 188     fmt_out.i_width = p_filter->fmt_out.video.i_width*p_filter->p_sys->scale/150;
 189     fmt_out.i_height = p_filter->fmt_out.video.i_height*p_filter->p_sys->scale/150;
 190     p_converted = image_Convert( p_filter->p_sys->p_image, p_pic,
 191                                  &(p_pic->format), &fmt_out );
 192
 193     if( p_converted )
 194     {
 195 #define copyimage( plane, b ) \
 196         for( y=0; y<p_converted->p[plane].i_visible_lines; y++) { \
 197         for( x=0; x<p_converted->p[plane].i_visible_pitch; x++) { \
 198             int nx, ny; \
 199             if( p_filter->p_sys->yinc == 1 ) \
 200                 ny= y; \
 201             else \
 202                 ny = p_converted->p[plane].i_visible_lines-y; \
 203             if( p_filter->p_sys->xinc == 1 ) \
 204                 nx = x; \
 205             else \
 206                 nx = p_converted->p[plane].i_visible_pitch-x; \
 207             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]; \
 208         } }
 209         copyimage( Y_PLANE, 2 );
 210         copyimage( U_PLANE, 1 );
 211         copyimage( V_PLANE, 1 );
 212 #undef copyimage
 213
 214         picture_Release( p_converted );
 215     }
 216     else
 217     {
 218         msg_Err( p_filter, "Image scaling failed miserably." );
 219     }
 220
 221     p_filter->p_sys->x += p_filter->p_sys->xinc;
 222     p_filter->p_sys->y += p_filter->p_sys->yinc;
 223
 224     p_filter->p_sys->scale += p_filter->p_sys->scaleinc;
 225     if( p_filter->p_sys->scale >= 50 ) p_filter->p_sys->scaleinc = -1;
 226     if( p_filter->p_sys->scale <= 1 ) p_filter->p_sys->scaleinc = 1;
 227
 228     w = p_filter->fmt_out.video.i_width*p_filter->p_sys->scale/150;
 229     h = p_filter->fmt_out.video.i_height*p_filter->p_sys->scale/150;
 230     if( p_filter->p_sys->x*2 + w >= p_filter->fmt_out.video.i_width )
 231         p_filter->p_sys->xinc = -1;
 232     if( p_filter->p_sys->x <= 0 )
 233         p_filter->p_sys->xinc = 1;
 234
 235     if( p_filter->p_sys->x*2 + w >= p_filter->fmt_out.video.i_width )
 236         p_filter->p_sys->x = (p_filter->fmt_out.video.i_width-w)/2;
 237     if( p_filter->p_sys->y*2 + h >= p_filter->fmt_out.video.i_height )
 238         p_filter->p_sys->y = (p_filter->fmt_out.video.i_height-h)/2;
 239
 240     if( p_filter->p_sys->y*2 + h >= p_filter->fmt_out.video.i_height )
 241         p_filter->p_sys->yinc = -1;
 242     if( p_filter->p_sys->y <= 0 )
 243         p_filter->p_sys->yinc = 1;
 244
 245     for( y = 0; y< 16; y++ )
 246     {
 247         if( p_filter->p_sys->v == 0 && p_filter->p_sys->u != 0 )
 248             p_filter->p_sys->u -= 1;
 249         else if( p_filter->p_sys->u == 0xff )
 250             p_filter->p_sys->v -= 1;
 251         else if( p_filter->p_sys->v == 0xff )
 252             p_filter->p_sys->u += 1;
 253         else if( p_filter->p_sys->u == 0 )
 254             p_filter->p_sys->v += 1;
 255     }
 256
 257     return CopyInfoAndRelease( p_outpic, p_pic );
 258 }