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 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #include <vlc/vlc.h>
  35 #include <vlc_vout.h>
  36
  37 #include "vlc_filter.h"
  38
  39 /*****************************************************************************
  40  * Local prototypes
  41  *****************************************************************************/
  42 static int  Create    ( vlc_object_t * );
  43 static void Destroy   ( vlc_object_t * );
  44
  45 static picture_t *Filter( filter_t *, picture_t * );
  46
  47 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
  48                            vlc_value_t oldval, vlc_value_t newval,
  49                            void *p_data );
  50
  51 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
  52                            vlc_value_t oldval, vlc_value_t newval,
  53                            void *p_data );
  54
  55 #define ANGLE_TEXT N_("Angle in degrees")
  56 #define ANGLE_LONGTEXT N_("Angle in degrees (0 to 359)")
  57
  58 #define FILTER_PREFIX "rotate-"
  59
  60 /*****************************************************************************
  61  * Module descriptor
  62  *****************************************************************************/
  63 vlc_module_begin();
  64     set_description( _("Rotate video filter") );
  65     set_shortname( _( "Rotate" ));
  66     set_capability( "video filter2", 0 );
  67     set_category( CAT_VIDEO );
  68     set_subcategory( SUBCAT_VIDEO_VFILTER );
  69
  70     add_integer_with_range( FILTER_PREFIX "angle", 30, 0, 359, NULL,
  71         ANGLE_TEXT, ANGLE_LONGTEXT, false );
  72
  73     add_shortcut( "rotate" );
  74     set_callbacks( Create, Destroy );
  75 vlc_module_end();
  76
  77 static const char *ppsz_filter_options[] = {
  78     "angle", NULL
  79 };
  80
  81 /*****************************************************************************
  82  * filter_sys_t
  83  *****************************************************************************/
  84 struct filter_sys_t
  85 {
  86     int     i_angle;
  87     int     i_cos;
  88     int     i_sin;
  89 };
  90
  91 static inline void cache_trigo( int i_angle, int *i_sin, int *i_cos )
  92 {
  93     const double f_angle = (((double)i_angle)*M_PI)/1800.;
  94     *i_sin = (int)(sin( f_angle )*4096.);
  95     *i_cos = (int)(cos( f_angle )*4096.);
  96 }
  97
  98 /*****************************************************************************
  99  * Create: allocates Distort video filter
 100  *****************************************************************************/
 101 static int Create( vlc_object_t *p_this )
 102 {
 103     filter_t *p_filter = (filter_t *)p_this;
 104     filter_sys_t *p_sys;
 105
 106     if(   p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0')
 107        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','Y','U','V')
 108        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','0')
 109        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2')
 110
 111        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','2')
 112        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','2')
 113       )
 114     {
 115         /* We only want planar YUV 4:2:0 or 4:2:2 */
 116         msg_Err( p_filter, "Unsupported input chroma (%4s)",
 117                  (char*)&(p_filter->fmt_in.video.i_chroma) );
 118         return VLC_EGENERIC;
 119     }
 120
 121     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 122     {
 123         msg_Err( p_filter, "Input and output chromas don't match" );
 124         return VLC_EGENERIC;
 125     }
 126
 127     /* Allocate structure */
 128     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 129     if( p_filter->p_sys == NULL )
 130     {
 131         msg_Err( p_filter, "out of memory" );
 132         return VLC_ENOMEM;
 133     }
 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     p_sys->i_angle = var_CreateGetIntegerCommand( p_filter,
 140                                                   FILTER_PREFIX "angle" ) * 10;
 141     var_Create( p_filter, FILTER_PREFIX "deciangle",
 142                 VLC_VAR_INTEGER|VLC_VAR_ISCOMMAND );
 143     var_AddCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_sys );
 144     var_AddCallback( p_filter, FILTER_PREFIX "deciangle",
 145                      PreciseRotateCallback, p_sys );
 146
 147     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 148
 149     p_filter->pf_video_filter = Filter;
 150
 151     return VLC_SUCCESS;
 152 }
 153
 154 /*****************************************************************************
 155  * Destroy: destroy Distort filter
 156  *****************************************************************************/
 157 static void Destroy( vlc_object_t *p_this )
 158 {
 159     filter_t *p_filter = (filter_t *)p_this;
 160
 161     free( p_filter->p_sys );
 162 }
 163
 164 /*****************************************************************************
 165  *
 166  *****************************************************************************/
 167 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 168 {
 169     picture_t *p_outpic;
 170     filter_sys_t *p_sys = p_filter->p_sys;
 171     int i_plane;
 172     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
 173
 174     if( !p_pic ) return NULL;
 175
 176     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 177     if( !p_outpic )
 178     {
 179         msg_Warn( p_filter, "can't get output picture" );
 180         if( p_pic->pf_release )
 181             p_pic->pf_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     p_outpic->date = p_pic->date;
 285     p_outpic->b_force = p_pic->b_force;
 286     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 287     p_outpic->b_progressive = p_pic->b_progressive;
 288     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 289
 290     if( p_pic->pf_release )
 291         p_pic->pf_release( p_pic );
 292
 293     return p_outpic;
 294 }
 295
 296 /*****************************************************************************
 297  * Angle modification callbacks.
 298  *****************************************************************************/
 299 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
 300                            vlc_value_t oldval, vlc_value_t newval,
 301                            void *p_data )
 302 {
 303     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
 304     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 305     p_sys->i_angle = newval.i_int*10;
 306     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 307     return VLC_SUCCESS;
 308 }
 309
 310 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
 311                            vlc_value_t oldval, vlc_value_t newval,
 312                            void *p_data )
 313 {
 314     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
 315     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 316     p_sys->i_angle = newval.i_int;
 317     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 318     return VLC_SUCCESS;
 319 }