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

   1 /*****************************************************************************
   2  * rotate.c : video rotation filter
   3  *****************************************************************************
   4  * Copyright (C) 2000-2008 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 #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_vout.h>
  37
  38 #include "vlc_filter.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 static picture_t *FilterPacked( filter_t *, picture_t * );
  49
  50 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
  51                            vlc_value_t oldval, vlc_value_t newval,
  52                            void *p_data );
  53
  54 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
  55                            vlc_value_t oldval, vlc_value_t newval,
  56                            void *p_data );
  57
  58 #define ANGLE_TEXT N_("Angle in degrees")
  59 #define ANGLE_LONGTEXT N_("Angle in degrees (0 to 359)")
  60
  61 #define FILTER_PREFIX "rotate-"
  62
  63 /*****************************************************************************
  64  * Module descriptor
  65  *****************************************************************************/
  66 vlc_module_begin ()
  67     set_description( N_("Rotate video filter") )
  68     set_shortname( N_( "Rotate" ))
  69     set_capability( "video filter2", 0 )
  70     set_category( CAT_VIDEO )
  71     set_subcategory( SUBCAT_VIDEO_VFILTER )
  72
  73     add_integer_with_range( FILTER_PREFIX "angle", 30, 0, 359, NULL,
  74         ANGLE_TEXT, ANGLE_LONGTEXT, false )
  75
  76     add_shortcut( "rotate" )
  77     set_callbacks( Create, Destroy )
  78 vlc_module_end ()
  79
  80 static const char *const ppsz_filter_options[] = {
  81     "angle", NULL
  82 };
  83
  84 /*****************************************************************************
  85  * filter_sys_t
  86  *****************************************************************************/
  87 struct filter_sys_t
  88 {
  89     int     i_cos;
  90     int     i_sin;
  91 };
  92
  93 static inline void cache_trigo( int i_angle, int *i_sin, int *i_cos )
  94 {
  95     const double f_angle = (((double)i_angle)*M_PI)/1800.;
  96     *i_sin = (int)(sin( f_angle )*4096.);
  97     *i_cos = (int)(cos( f_angle )*4096.);
  98 }
  99
 100 /*****************************************************************************
 101  * Create: allocates Distort video filter
 102  *****************************************************************************/
 103 static int Create( vlc_object_t *p_this )
 104 {
 105     filter_t *p_filter = (filter_t *)p_this;
 106     filter_sys_t *p_sys;
 107
 108     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 109     {
 110         msg_Err( p_filter, "Input and output chromas don't match" );
 111         return VLC_EGENERIC;
 112     }
 113
 114     switch( p_filter->fmt_in.video.i_chroma )
 115     {
 116         CASE_PLANAR_YUV
 117             p_filter->pf_video_filter = Filter;
 118             break;
 119
 120         CASE_PACKED_YUV_422
 121             p_filter->pf_video_filter = FilterPacked;
 122             break;
 123
 124         default:
 125             msg_Err( p_filter, "Unsupported input chroma (%4s)",
 126                      (char*)&(p_filter->fmt_in.video.i_chroma) );
 127             return VLC_EGENERIC;
 128     }
 129
 130     /* Allocate structure */
 131     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 132     if( p_filter->p_sys == NULL )
 133         return VLC_ENOMEM;
 134     p_sys = p_filter->p_sys;
 135
 136     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 137                        p_filter->p_cfg );
 138
 139     int i_angle = var_CreateGetIntegerCommand( p_filter,
 140                                                FILTER_PREFIX "angle" ) * 10;
 141     cache_trigo( i_angle, &p_sys->i_sin, &p_sys->i_cos );
 142     var_Create( p_filter, FILTER_PREFIX "deciangle",
 143                 VLC_VAR_INTEGER|VLC_VAR_ISCOMMAND );
 144     var_AddCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_sys );
 145     var_AddCallback( p_filter, FILTER_PREFIX "deciangle",
 146                      PreciseRotateCallback, p_sys );
 147
 148
 149     return VLC_SUCCESS;
 150 }
 151
 152 /*****************************************************************************
 153  * Destroy: destroy Distort filter
 154  *****************************************************************************/
 155 static void Destroy( vlc_object_t *p_this )
 156 {
 157     filter_t *p_filter = (filter_t *)p_this;
 158
 159     var_DelCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_filter->p_sys );
 160     var_DelCallback( p_filter, FILTER_PREFIX "deciangle",
 161                      PreciseRotateCallback, p_filter->p_sys );
 162
 163     free( p_filter->p_sys );
 164 }
 165
 166 /*****************************************************************************
 167  *
 168  *****************************************************************************/
 169 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 170 {
 171     picture_t *p_outpic;
 172     filter_sys_t *p_sys = p_filter->p_sys;
 173     int i_plane;
 174     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
 175
 176     if( !p_pic ) return NULL;
 177
 178     p_outpic = filter_NewPicture( p_filter );
 179     if( !p_outpic )
 180     {
 181         picture_Release( p_pic );
 182         return NULL;
 183     }
 184
 185     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 186     {
 187         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 188         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 189         const int i_pitch         = p_pic->p[i_plane].i_pitch;
 190         const int i_hidden_pitch  = i_pitch - i_visible_pitch;
 191
 192         const int i_aspect = ( i_visible_lines * p_pic->p[Y_PLANE].i_visible_pitch ) / ( p_pic->p[Y_PLANE].i_visible_lines * i_visible_pitch );
 193         /* = 2 for U and V planes in YUV 4:2:2, = 1 otherwise */
 194
 195         const int i_line_center = i_visible_lines>>1;
 196         const int i_col_center  = i_visible_pitch>>1;
 197
 198         const uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 199         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 200         uint8_t *p_outendline = p_out + i_visible_pitch;
 201         const uint8_t *p_outend = p_out + i_visible_lines * i_pitch;
 202
 203         const uint8_t black_pixel = ( i_plane == Y_PLANE ) ? 0x00 : 0x80;
 204
 205         const int i_line_next =  i_cos / i_aspect -i_sin*i_visible_pitch;
 206         const int i_col_next  = -i_sin / i_aspect -i_cos*i_visible_pitch;
 207         int i_line_orig0 = ( - i_cos * i_line_center / i_aspect
 208                              - i_sin * i_col_center + (1<<11) );
 209         int i_col_orig0 =    i_sin * i_line_center / i_aspect
 210                            - i_cos * i_col_center + (1<<11);
 211         for( ; p_outendline < p_outend;
 212              p_out += i_hidden_pitch, p_outendline += i_pitch,
 213              i_line_orig0 += i_line_next, i_col_orig0 += i_col_next )
 214         {
 215             for( ; p_out < p_outendline;
 216                  p_out++, i_line_orig0 += i_sin, i_col_orig0 += i_cos )
 217             {
 218                 const int i_line_orig = (i_line_orig0>>12)*i_aspect + i_line_center;
 219                 const int i_col_orig  = (i_col_orig0>>12)  + i_col_center;
 220                 const uint8_t* p_orig_offset = p_in + i_line_orig * i_pitch
 221                                                 + i_col_orig;
 222                 const uint8_t i_line_percent = (i_line_orig0>>4) & 255;
 223                 const uint8_t i_col_percent  = (i_col_orig0 >>4) & 255;
 224
 225                 if(    -1 <= i_line_orig && i_line_orig < i_visible_lines
 226                     && -1 <= i_col_orig  && i_col_orig  < i_visible_pitch )
 227                 {
 228                 #define test 1
 229                 #undef test
 230                 #ifdef test
 231                     if( ( i_col_orig > i_visible_pitch/2 ) )
 232                 #endif
 233                     {
 234                         uint8_t i_curpix = black_pixel;
 235                         uint8_t i_colpix = black_pixel;
 236                         uint8_t i_linpix = black_pixel;
 237                         uint8_t i_nexpix = black_pixel;
 238                         if( ( 0 <= i_line_orig ) && ( 0 <= i_col_orig ) )
 239                             i_curpix = *p_orig_offset;
 240                         p_orig_offset++;
 241
 242                         if(  ( i_col_orig < i_visible_pitch - 1)
 243                              && ( i_line_orig >= 0 ) )
 244                             i_colpix = *p_orig_offset;
 245
 246                         p_orig_offset+=i_pitch;
 247                         if( ( i_line_orig < i_visible_lines - 1)
 248                             && ( i_col_orig  < i_visible_pitch - 1) )
 249                             i_nexpix = *p_orig_offset;
 250
 251                         p_orig_offset--;
 252                         if(  ( i_line_orig < i_visible_lines - 1)
 253                              && ( i_col_orig >= 0 ) )
 254                             i_linpix = *p_orig_offset;
 255
 256                         unsigned int temp = 0;
 257                         temp+= i_curpix *
 258                             (256 - i_line_percent) * ( 256 - i_col_percent );
 259                         temp+= i_linpix *
 260                             i_line_percent * (256 - i_col_percent );
 261                         temp+= i_nexpix *
 262                             ( i_col_percent) * ( i_line_percent);
 263                         temp+= i_colpix *
 264                             i_col_percent * (256 - i_line_percent );
 265                         *p_out = temp >> 16;
 266                     }
 267                 #ifdef test
 268                     else if (i_col_orig == i_visible_pitch/2 )
 269                     {   *p_out = black_pixel;
 270                     }
 271                     else
 272                         *p_out = *p_orig_offset;
 273                 #endif
 274                 #undef test
 275                 }
 276                 else
 277                 {
 278                     *p_out = black_pixel;
 279                 }
 280             }
 281         }
 282     }
 283
 284     return CopyInfoAndRelease( p_outpic, p_pic );
 285 }
 286
 287 /*****************************************************************************
 288  *
 289  *****************************************************************************/
 290 static picture_t *FilterPacked( filter_t *p_filter, picture_t *p_pic )
 291 {
 292     picture_t *p_outpic;
 293     filter_sys_t *p_sys = p_filter->p_sys;
 294     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
 295
 296     if( !p_pic ) return NULL;
 297
 298     int i_u_offset, i_v_offset, i_y_offset;
 299
 300     if( GetPackedYuvOffsets( p_pic->format.i_chroma, &i_y_offset,
 301                              &i_u_offset, &i_v_offset ) != VLC_SUCCESS )
 302     {
 303         msg_Warn( p_filter, "Unsupported input chroma (%4s)",
 304                   (char*)&(p_pic->format.i_chroma) );
 305         picture_Release( p_pic );
 306         return NULL;
 307     }
 308
 309     p_outpic = filter_NewPicture( p_filter );
 310     if( !p_outpic )
 311     {
 312         picture_Release( p_pic );
 313         return NULL;
 314     }
 315
 316     const uint8_t *p_in   = p_pic->p->p_pixels+i_y_offset;
 317     const uint8_t *p_in_u = p_pic->p->p_pixels+i_u_offset;
 318     const uint8_t *p_in_v = p_pic->p->p_pixels+i_v_offset;
 319
 320     const int i_pitch         = p_pic->p->i_pitch;
 321     const int i_visible_pitch = p_pic->p->i_visible_pitch>>1; /* In fact it's i_visible_pixels */
 322     const int i_visible_lines = p_pic->p->i_visible_lines;
 323
 324     uint8_t *p_out   = p_outpic->p->p_pixels+i_y_offset;
 325     uint8_t *p_out_u = p_outpic->p->p_pixels+i_u_offset;
 326     uint8_t *p_out_v = p_outpic->p->p_pixels+i_v_offset;
 327
 328     const int i_line_center = i_visible_lines>>1;
 329     const int i_col_center  = i_visible_pitch>>1;
 330
 331     int i_col, i_line;
 332     for( i_line = 0; i_line < i_visible_lines; i_line++ )
 333     {
 334         for( i_col = 0; i_col < i_visible_pitch; i_col++ )
 335         {
 336             int i_line_orig;
 337             int i_col_orig;
 338             /* Handle "1st Y", U and V */
 339             i_line_orig = i_line_center +
 340                 ( ( i_sin * ( i_col - i_col_center )
 341                   + i_cos * ( i_line - i_line_center ) )>>12 );
 342             i_col_orig = i_col_center +
 343                 ( ( i_cos * ( i_col - i_col_center )
 344                   - i_sin * ( i_line - i_line_center ) )>>12 );
 345             if( 0 <= i_col_orig && i_col_orig < i_visible_pitch
 346              && 0 <= i_line_orig && i_line_orig < i_visible_lines )
 347             {
 348                 p_out[i_line*i_pitch+2*i_col] = p_in[i_line_orig*i_pitch+2*i_col_orig];
 349                 i_col_orig /= 2;
 350                 p_out_u[i_line*i_pitch+2*i_col] = p_in_u[i_line_orig*i_pitch+4*i_col_orig];
 351                 p_out_v[i_line*i_pitch+2*i_col] = p_in_v[i_line_orig*i_pitch+4*i_col_orig];
 352             }
 353             else
 354             {
 355                 p_out[i_line*i_pitch+2*i_col] = 0x00;
 356                 p_out_u[i_line*i_pitch+2*i_col] = 0x80;
 357                 p_out_v[i_line*i_pitch+2*i_col] = 0x80;
 358             }
 359
 360             /* Handle "2nd Y" */
 361             i_col++;
 362             if( i_col >= i_visible_pitch )
 363                 break;
 364
 365             i_line_orig = i_line_center +
 366                 ( ( i_sin * ( i_col - i_col_center )
 367                   + i_cos * ( i_line - i_line_center ) )>>12 );
 368             i_col_orig = i_col_center +
 369                 ( ( i_cos * ( i_col - i_col_center )
 370                   - i_sin * ( i_line - i_line_center ) )>>12 );
 371             if( 0 <= i_col_orig && i_col_orig < i_visible_pitch
 372              && 0 <= i_line_orig && i_line_orig < i_visible_lines )
 373             {
 374                 p_out[i_line*i_pitch+2*i_col] = p_in[i_line_orig*i_pitch+2*i_col_orig];
 375             }
 376             else
 377             {
 378                 p_out[i_line*i_pitch+2*i_col] = 0x00;
 379             }
 380         }
 381     }
 382
 383     return CopyInfoAndRelease( p_outpic, p_pic );
 384 }
 385
 386 /*****************************************************************************
 387  * Angle modification callbacks.
 388  *****************************************************************************/
 389 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
 390                            vlc_value_t oldval, vlc_value_t newval,
 391                            void *p_data )
 392 {
 393     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
 394     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 395
 396     cache_trigo( newval.i_int * 10, &p_sys->i_sin, &p_sys->i_cos );
 397     return VLC_SUCCESS;
 398 }
 399
 400 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
 401                            vlc_value_t oldval, vlc_value_t newval,
 402                            void *p_data )
 403 {
 404     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
 405     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 406
 407     cache_trigo( newval.i_int, &p_sys->i_sin, &p_sys->i_cos );
 408     return VLC_SUCCESS;
 409 }