git.sesse.net Git - vlc/blob - modules/video_filter/rotate.c

   1 /*****************************************************************************
   2  * rotate.c : video rotation filter
   3  *****************************************************************************
   4  * Copyright (C) 2000-2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Antoine Cellerier <dionoea -at- videolan -dot- org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 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 General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #include <math.h>                                            /* sin(), cos() */
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc_vout.h>
  32
  33 #include "vlc_filter.h"
  34
  35 /*****************************************************************************
  36  * Local prototypes
  37  *****************************************************************************/
  38 static int  Create    ( vlc_object_t * );
  39 static void Destroy   ( vlc_object_t * );
  40
  41 static picture_t *Filter( filter_t *, picture_t * );
  42
  43 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
  44                            vlc_value_t oldval, vlc_value_t newval,
  45                            void *p_data );
  46
  47 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
  48                            vlc_value_t oldval, vlc_value_t newval,
  49                            void *p_data );
  50
  51 #define ANGLE_TEXT N_("Angle in degrees")
  52 #define ANGLE_LONGTEXT N_("Angle in degrees (0 to 359)")
  53
  54 #define FILTER_PREFIX "rotate-"
  55
  56 /*****************************************************************************
  57  * Module descriptor
  58  *****************************************************************************/
  59 vlc_module_begin();
  60     set_description( _("Rotate video filter") );
  61     set_shortname( _( "Rotate" ));
  62     set_capability( "video filter2", 0 );
  63     set_category( CAT_VIDEO );
  64     set_subcategory( SUBCAT_VIDEO_VFILTER );
  65
  66     add_integer_with_range( FILTER_PREFIX "angle", 0, 0, 359, NULL,
  67         ANGLE_TEXT, ANGLE_LONGTEXT, VLC_FALSE );
  68
  69     add_shortcut( "rotate" );
  70     set_callbacks( Create, Destroy );
  71 vlc_module_end();
  72
  73 static const char *ppsz_filter_options[] = {
  74     "angle", NULL
  75 };
  76
  77 /*****************************************************************************
  78  * filter_sys_t
  79  *****************************************************************************/
  80 struct filter_sys_t
  81 {
  82     int     i_angle;
  83     int     i_cos;
  84     int     i_sin;
  85 };
  86
  87 static inline void cache_trigo( int i_angle, int *i_sin, int *i_cos )
  88 {
  89     const double f_angle = (((double)i_angle)*M_PI)/1800.;
  90     *i_sin = (int)(sin( f_angle )*4096.);
  91     *i_cos = (int)(cos( f_angle )*4096.);
  92 }
  93
  94 /*****************************************************************************
  95  * Create: allocates Distort video filter
  96  *****************************************************************************/
  97 static int Create( vlc_object_t *p_this )
  98 {
  99     filter_t *p_filter = (filter_t *)p_this;
 100     filter_sys_t *p_sys;
 101
 102     /* Allocate structure */
 103     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 104     if( p_filter->p_sys == NULL )
 105     {
 106         msg_Err( p_filter, "out of memory" );
 107         return VLC_ENOMEM;
 108     }
 109     p_sys = p_filter->p_sys;
 110
 111     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 112                        p_filter->p_cfg );
 113
 114     p_sys->i_angle = var_CreateGetIntegerCommand( p_filter,
 115                                                   FILTER_PREFIX "angle" ) * 10;
 116     var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "deciangle" );
 117     var_AddCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_sys );
 118     var_AddCallback( p_filter, FILTER_PREFIX "deciangle", PreciseRotateCallback, p_sys );
 119
 120     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 121
 122     p_filter->pf_video_filter = Filter;
 123
 124     return VLC_SUCCESS;
 125 }
 126
 127 /*****************************************************************************
 128  * Destroy: destroy Distort filter
 129  *****************************************************************************/
 130 static void Destroy( vlc_object_t *p_this )
 131 {
 132     filter_t *p_filter = (filter_t *)p_this;
 133
 134     free( p_filter->p_sys );
 135 }
 136
 137 /*****************************************************************************
 138  *
 139  *****************************************************************************/
 140 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 141 {
 142     picture_t *p_outpic;
 143     filter_sys_t *p_sys = p_filter->p_sys;
 144     int i_plane;
 145     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
 146
 147     if( !p_pic ) return NULL;
 148
 149     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 150     if( !p_outpic )
 151     {
 152         msg_Warn( p_filter, "can't get output picture" );
 153         if( p_pic->pf_release )
 154             p_pic->pf_release( p_pic );
 155         return NULL;
 156     }
 157
 158     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 159     {
 160         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 161         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 162         const int i_pitch         = p_pic->p[i_plane].i_pitch;
 163         const int i_hidden_pitch  = i_pitch - i_visible_pitch;
 164
 165         const int i_line_center = i_visible_lines>>1;
 166         const int i_col_center  = i_visible_pitch>>1;
 167
 168         const uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 169         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 170         uint8_t *p_outendline = p_out + i_visible_pitch;
 171         const uint8_t *p_outend = p_out + i_visible_lines * i_pitch;
 172
 173         const uint8_t black_pixel = ( i_plane == Y_PLANE ) ? 0x00 : 0x80;
 174
 175         const int i_line_next =  i_cos-i_sin*i_visible_pitch;
 176         const int i_col_next  = -i_sin-i_cos*i_visible_pitch;
 177         int i_line_orig0 = - i_cos * i_line_center
 178                            - i_sin * i_col_center + (1<<11);
 179         int i_col_orig0 =    i_sin * i_line_center
 180                            - i_cos * i_col_center + (1<<11);
 181         for( ; p_outendline < p_outend;
 182              p_out += i_hidden_pitch, p_outendline += i_pitch,
 183              i_line_orig0 += i_line_next, i_col_orig0 += i_col_next )
 184         {
 185             for( ; p_out < p_outendline;
 186                  p_out++, i_line_orig0 += i_sin, i_col_orig0 += i_cos )
 187             {
 188                 const int i_line_orig = (i_line_orig0>>12) + i_line_center;
 189                 const int i_col_orig  = (i_col_orig0>>12)  + i_col_center;
 190                 const uint8_t* p_orig_offset = p_in + i_line_orig * i_pitch
 191                                                 + i_col_orig;
 192                 const uint8_t i_line_percent = (i_line_orig0>>4) & 255;
 193                 const uint8_t i_col_percent  = (i_col_orig0 >>4) & 255;
 194
 195                 if(    -1 <= i_line_orig && i_line_orig < i_visible_lines
 196                     && -1 <= i_col_orig  && i_col_orig  < i_visible_pitch )
 197                 {
 198                 #define test 1
 199                 #undef test
 200                 #ifdef test
 201                     if( ( i_col_orig > i_visible_pitch/2 ) )
 202                 #endif
 203                     {
 204                         uint8_t i_curpix = black_pixel;
 205                         uint8_t i_colpix = black_pixel;
 206                         uint8_t i_linpix = black_pixel;
 207                         uint8_t i_nexpix = black_pixel;
 208                         if( ( 0 <= i_line_orig ) && ( 0 <= i_col_orig ) )
 209                             i_curpix = *p_orig_offset;
 210                         p_orig_offset++;
 211
 212                         if(  ( i_col_orig < i_visible_pitch - 1)
 213                              && ( i_line_orig >= 0 ) )
 214                             i_colpix=*p_orig_offset;
 215
 216                         p_orig_offset+=i_pitch;
 217                         if( ( i_line_orig < i_visible_lines - 1)
 218                             && ( i_col_orig  < i_visible_pitch - 1) )
 219                             i_nexpix=*p_orig_offset;
 220
 221                         p_orig_offset--;
 222                         if(  ( i_line_orig < i_visible_lines - 1)
 223                              && ( i_col_orig >= 0 ) )
 224                             i_linpix=*p_orig_offset;
 225
 226                         unsigned int temp = 0;
 227                         temp+= i_curpix *
 228                             (256 - i_line_percent) * ( 256 - i_col_percent );
 229                         temp+= i_linpix *
 230                             i_line_percent * (256 - i_col_percent );
 231                         temp+= i_nexpix *
 232                             ( i_col_percent) * ( i_line_percent);
 233                         temp+= i_colpix *
 234                             i_col_percent * (256 - i_line_percent );
 235                         *p_out = temp >> 16;
 236                     }
 237                 #ifdef test
 238                     else if (i_col_orig == i_visible_pitch/2 )
 239                     {   *p_out = black_pixel;
 240                     }
 241                     else
 242                         *p_out = *p_orig_offset;
 243                 #endif
 244                 #undef test
 245                 }
 246                 else
 247                 {
 248                     *p_out = black_pixel;
 249                 }
 250             }
 251         }
 252     }
 253
 254     p_outpic->date = p_pic->date;
 255     p_outpic->b_force = p_pic->b_force;
 256     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 257     p_outpic->b_progressive = p_pic->b_progressive;
 258     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 259
 260     if( p_pic->pf_release )
 261         p_pic->pf_release( p_pic );
 262
 263     return p_outpic;
 264 }
 265
 266 /*****************************************************************************
 267  *
 268  *****************************************************************************/
 269 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
 270                            vlc_value_t oldval, vlc_value_t newval,
 271                            void *p_data )
 272 {
 273     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 274
 275     if( !strcmp( psz_var, "rotate-angle" ) )
 276     {
 277         p_sys->i_angle = newval.i_int*10;
 278
 279         cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 280     }
 281     return VLC_SUCCESS;
 282 }
 283 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
 284                            vlc_value_t oldval, vlc_value_t newval,
 285                            void *p_data )
 286 {
 287     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 288
 289     if( !strcmp( psz_var, "rotate-deciangle" ) )
 290     {
 291         p_sys->i_angle = newval.i_int;
 292         cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 293     }
 294     return VLC_SUCCESS;
 295 }