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  *
   6  * Authors: Samuel Hocevar <sam@zoy.org>
   7  *          Antoine Cellerier <dionoea -at- videolan -dot- org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <math.h>                                            /* sin(), cos() */
  33
  34 #include <vlc_common.h>
  35 #include <vlc_plugin.h>
  36 #include <vlc_filter.h>
  37 #include <vlc_picture.h>
  38 #include <vlc_image.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_("Psychedelic video filter") )
  54     set_shortname( N_( "Psychedelic" ))
  55     set_capability( "video filter", 0 )
  56     set_category( CAT_VIDEO )
  57     set_subcategory( SUBCAT_VIDEO_VFILTER )
  58
  59     add_shortcut( "psychedelic" )
  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 typedef struct
  70 {
  71     image_handler_t *p_image;
  72     unsigned int x, y, scale;
  73     int xinc, yinc, scaleinc;
  74     uint8_t u,v;
  75 } filter_sys_t;
  76
  77 /*****************************************************************************
  78  * Create: allocates Distort video thread output method
  79  *****************************************************************************
  80  * This function allocates and initializes a Distort vout method.
  81  *****************************************************************************/
  82 static int Create( vlc_object_t *p_this )
  83 {
  84     filter_t *p_filter = (filter_t *)p_this;
  85
  86     const vlc_fourcc_t fourcc = p_filter->fmt_in.video.i_chroma;
  87     const vlc_chroma_description_t *p_chroma = vlc_fourcc_GetChromaDescription( fourcc );
  88     if( !p_chroma || p_chroma->plane_count != 3 || p_chroma->pixel_size != 1 ) {
  89         msg_Err( p_filter, "Unsupported chroma (%4.4s)", (char*)&fourcc );
  90         return VLC_EGENERIC;
  91     }
  92
  93     /* Allocate structure */
  94     filter_sys_t *p_sys = malloc( sizeof( filter_sys_t ) );
  95     if( p_sys == NULL )
  96         return VLC_ENOMEM;
  97     p_filter->p_sys = p_sys;
  98
  99     p_filter->pf_video_filter = Filter;
 100
 101     p_sys->x = 10;
 102     p_sys->y = 10;
 103     p_sys->scale = 1;
 104     p_sys->xinc = 1;
 105     p_sys->yinc = 1;
 106     p_sys->scaleinc = 1;
 107     p_sys->u = 0;
 108     p_sys->v = 0;
 109     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     filter_sys_t *p_sys = p_filter->p_sys;
 123
 124     if( p_sys->p_image )
 125         image_HandlerDelete( p_sys->p_image );
 126     p_sys->p_image = NULL;
 127
 128     free( p_sys );
 129 }
 130
 131 /*****************************************************************************
 132  * Render: displays previously rendered output
 133  *****************************************************************************
 134  * This function send the currently rendered image to Distort image, waits
 135  * until it is displayed and switch the two rendering buffers, preparing next
 136  * frame.
 137  *****************************************************************************/
 138 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 139 {
 140     picture_t *p_outpic;
 141
 142     unsigned int w, h;
 143     uint8_t u,v;
 144
 145     picture_t *p_converted;
 146     video_format_t fmt_out;
 147
 148     if( !p_pic ) return NULL;
 149
 150     p_outpic = filter_NewPicture( p_filter );
 151     if( !p_outpic )
 152     {
 153         picture_Release( p_pic );
 154         return NULL;
 155     }
 156
 157     filter_sys_t *p_sys = p_filter->p_sys;
 158
 159     if( !p_sys->p_image )
 160         p_sys->p_image = image_HandlerCreate( p_filter );
 161
 162     /* chrominance */
 163     u = p_sys->u;
 164     v = p_sys->v;
 165     for( int 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_sys->scale/150;
 189     fmt_out.i_height = p_filter->fmt_out.video.i_height*p_sys->scale/150;
 190     fmt_out.i_visible_width = fmt_out.i_width;
 191     fmt_out.i_visible_height = fmt_out.i_height;
 192     p_converted = image_Convert( p_sys->p_image, p_pic,
 193                                  &(p_pic->format), &fmt_out );
 194
 195     if( p_converted )
 196     {
 197 #define copyimage( plane, b ) \
 198         for( int y = 0; y<p_converted->p[plane].i_visible_lines; y++ ) { \
 199         for( int x = 0; x<p_converted->p[plane].i_visible_pitch; x++ ) { \
 200             int nx, ny; \
 201             if( p_sys->yinc == 1 ) \
 202                 ny= y; \
 203             else \
 204                 ny = p_converted->p[plane].i_visible_lines-y -1; \
 205             if( p_sys->xinc == 1 ) \
 206                 nx = x; \
 207             else \
 208                 nx = p_converted->p[plane].i_visible_pitch-x -1; \
 209             p_outpic->p[plane].p_pixels[(p_sys->x*b+nx)+(ny+p_sys->y*b)*p_outpic->p[plane].i_pitch ] = p_converted->p[plane].p_pixels[y*p_converted->p[plane].i_pitch+x]; \
 210         } }
 211         copyimage( Y_PLANE, 2 );
 212         copyimage( U_PLANE, 1 );
 213         copyimage( V_PLANE, 1 );
 214 #undef copyimage
 215
 216         picture_Release( p_converted );
 217     }
 218     else
 219     {
 220         msg_Err( p_filter, "Image scaling failed miserably." );
 221     }
 222
 223     p_sys->x += p_sys->xinc;
 224     p_sys->y += p_sys->yinc;
 225
 226     p_sys->scale += p_sys->scaleinc;
 227     if( p_sys->scale >= 50 ) p_sys->scaleinc = -1;
 228     if( p_sys->scale <= 1 ) p_sys->scaleinc = 1;
 229
 230     w = p_filter->fmt_out.video.i_width*p_sys->scale/150;
 231     h = p_filter->fmt_out.video.i_height*p_sys->scale/150;
 232     if( p_sys->x*2 + w >= p_filter->fmt_out.video.i_width )
 233         p_sys->xinc = -1;
 234     if( p_sys->x <= 0 )
 235         p_sys->xinc = 1;
 236
 237     if( p_sys->x*2 + w >= p_filter->fmt_out.video.i_width )
 238         p_sys->x = (p_filter->fmt_out.video.i_width-w)/2;
 239     if( p_sys->y*2 + h >= p_filter->fmt_out.video.i_height )
 240         p_sys->y = (p_filter->fmt_out.video.i_height-h)/2;
 241
 242     if( p_sys->y*2 + h >= p_filter->fmt_out.video.i_height )
 243         p_sys->yinc = -1;
 244     if( p_sys->y <= 0 )
 245         p_sys->yinc = 1;
 246
 247     for( int y = 0; y < 16; y++ )
 248     {
 249         if( p_sys->v == 0 && p_sys->u != 0 )
 250             p_sys->u -= 1;
 251         else if( p_sys->u == 0xff )
 252             p_sys->v -= 1;
 253         else if( p_sys->v == 0xff )
 254             p_sys->u += 1;
 255         else if( p_sys->u == 0 )
 256             p_sys->v += 1;
 257     }
 258
 259     return CopyInfoAndRelease( p_outpic, p_pic );
 260 }