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", 30, 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     if(   p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0')
 103        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','Y','U','V')
 104        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','0')
 105        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2')
 106
 107        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','2')
 108        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','2')
 109       )
 110     {
 111         /* We only want planar YUV 4:2:0 or 4:2:2 */
 112         msg_Err( p_filter, "Unsupported input chroma (%4s)",
 113                  (char*)&(p_filter->fmt_in.video.i_chroma) );
 114         return VLC_EGENERIC;
 115     }
 116
 117     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 118     {
 119         msg_Err( p_filter, "Input and output chromas don't match" );
 120         return VLC_EGENERIC;
 121     }
 122
 123     /* Allocate structure */
 124     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 125     if( p_filter->p_sys == NULL )
 126     {
 127         msg_Err( p_filter, "out of memory" );
 128         return VLC_ENOMEM;
 129     }
 130     p_sys = p_filter->p_sys;
 131
 132     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 133                        p_filter->p_cfg );
 134
 135     p_sys->i_angle = var_CreateGetIntegerCommand( p_filter,
 136                                                   FILTER_PREFIX "angle" ) * 10;
 137     var_Create( p_filter, FILTER_PREFIX "deciangle",
 138                 VLC_VAR_INTEGER|VLC_VAR_ISCOMMAND );
 139     var_AddCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_sys );
 140     var_AddCallback( p_filter, FILTER_PREFIX "deciangle",
 141                      PreciseRotateCallback, p_sys );
 142
 143     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 144
 145     p_filter->pf_video_filter = Filter;
 146
 147     return VLC_SUCCESS;
 148 }
 149
 150 /*****************************************************************************
 151  * Destroy: destroy Distort filter
 152  *****************************************************************************/
 153 static void Destroy( vlc_object_t *p_this )
 154 {
 155     filter_t *p_filter = (filter_t *)p_this;
 156
 157     free( p_filter->p_sys );
 158 }
 159
 160 /*****************************************************************************
 161  *
 162  *****************************************************************************/
 163 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 164 {
 165     picture_t *p_outpic;
 166     filter_sys_t *p_sys = p_filter->p_sys;
 167     int i_plane;
 168     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
 169
 170     if( !p_pic ) return NULL;
 171
 172     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 173     if( !p_outpic )
 174     {
 175         msg_Warn( p_filter, "can't get output picture" );
 176         if( p_pic->pf_release )
 177             p_pic->pf_release( p_pic );
 178         return NULL;
 179     }
 180
 181     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 182     {
 183         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 184         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 185         const int i_pitch         = p_pic->p[i_plane].i_pitch;
 186         const int i_hidden_pitch  = i_pitch - i_visible_pitch;
 187
 188         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 );
 189         /* = 2 for U and V planes in YUV 4:2:2, = 1 otherwise */
 190
 191         const int i_line_center = i_visible_lines>>1;
 192         const int i_col_center  = i_visible_pitch>>1;
 193
 194         const uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 195         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 196         uint8_t *p_outendline = p_out + i_visible_pitch;
 197         const uint8_t *p_outend = p_out + i_visible_lines * i_pitch;
 198
 199         const uint8_t black_pixel = ( i_plane == Y_PLANE ) ? 0x00 : 0x80;
 200
 201         const int i_line_next =  i_cos / i_aspect -i_sin*i_visible_pitch;
 202         const int i_col_next  = -i_sin / i_aspect -i_cos*i_visible_pitch;
 203         int i_line_orig0 = ( - i_cos * i_line_center / i_aspect
 204                              - i_sin * i_col_center + (1<<11) );
 205         int i_col_orig0 =    i_sin * i_line_center / i_aspect
 206                            - i_cos * i_col_center + (1<<11);
 207         for( ; p_outendline < p_outend;
 208              p_out += i_hidden_pitch, p_outendline += i_pitch,
 209              i_line_orig0 += i_line_next, i_col_orig0 += i_col_next )
 210         {
 211             for( ; p_out < p_outendline;
 212                  p_out++, i_line_orig0 += i_sin, i_col_orig0 += i_cos )
 213             {
 214                 const int i_line_orig = (i_line_orig0>>12)*i_aspect + i_line_center;
 215                 const int i_col_orig  = (i_col_orig0>>12)  + i_col_center;
 216                 const uint8_t* p_orig_offset = p_in + i_line_orig * i_pitch
 217                                                 + i_col_orig;
 218                 const uint8_t i_line_percent = (i_line_orig0>>4) & 255;
 219                 const uint8_t i_col_percent  = (i_col_orig0 >>4) & 255;
 220
 221                 if(    -1 <= i_line_orig && i_line_orig < i_visible_lines
 222                     && -1 <= i_col_orig  && i_col_orig  < i_visible_pitch )
 223                 {
 224                 #define test 1
 225                 #undef test
 226                 #ifdef test
 227                     if( ( i_col_orig > i_visible_pitch/2 ) )
 228                 #endif
 229                     {
 230                         uint8_t i_curpix = black_pixel;
 231                         uint8_t i_colpix = black_pixel;
 232                         uint8_t i_linpix = black_pixel;
 233                         uint8_t i_nexpix = black_pixel;
 234                         if( ( 0 <= i_line_orig ) && ( 0 <= i_col_orig ) )
 235                             i_curpix = *p_orig_offset;
 236                         p_orig_offset++;
 237
 238                         if(  ( i_col_orig < i_visible_pitch - 1)
 239                              && ( i_line_orig >= 0 ) )
 240                             i_colpix = *p_orig_offset;
 241
 242                         p_orig_offset+=i_pitch;
 243                         if( ( i_line_orig < i_visible_lines - 1)
 244                             && ( i_col_orig  < i_visible_pitch - 1) )
 245                             i_nexpix = *p_orig_offset;
 246
 247                         p_orig_offset--;
 248                         if(  ( i_line_orig < i_visible_lines - 1)
 249                              && ( i_col_orig >= 0 ) )
 250                             i_linpix = *p_orig_offset;
 251
 252                         unsigned int temp = 0;
 253                         temp+= i_curpix *
 254                             (256 - i_line_percent) * ( 256 - i_col_percent );
 255                         temp+= i_linpix *
 256                             i_line_percent * (256 - i_col_percent );
 257                         temp+= i_nexpix *
 258                             ( i_col_percent) * ( i_line_percent);
 259                         temp+= i_colpix *
 260                             i_col_percent * (256 - i_line_percent );
 261                         *p_out = temp >> 16;
 262                     }
 263                 #ifdef test
 264                     else if (i_col_orig == i_visible_pitch/2 )
 265                     {   *p_out = black_pixel;
 266                     }
 267                     else
 268                         *p_out = *p_orig_offset;
 269                 #endif
 270                 #undef test
 271                 }
 272                 else
 273                 {
 274                     *p_out = black_pixel;
 275                 }
 276             }
 277         }
 278     }
 279
 280     p_outpic->date = p_pic->date;
 281     p_outpic->b_force = p_pic->b_force;
 282     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 283     p_outpic->b_progressive = p_pic->b_progressive;
 284     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 285
 286     if( p_pic->pf_release )
 287         p_pic->pf_release( p_pic );
 288
 289     return p_outpic;
 290 }
 291
 292 /*****************************************************************************
 293  * Angle modification callbacks.
 294  *****************************************************************************/
 295 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
 296                            vlc_value_t oldval, vlc_value_t newval,
 297                            void *p_data )
 298 {
 299     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 300     p_sys->i_angle = newval.i_int*10;
 301     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 302     return VLC_SUCCESS;
 303 }
 304
 305 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
 306                            vlc_value_t oldval, vlc_value_t newval,
 307                            void *p_data )
 308 {
 309     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 310     p_sys->i_angle = newval.i_int;
 311     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 312     return VLC_SUCCESS;
 313 }