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_plugin.h>
  36 #include <vlc_vout.h>
  37
  38 #include "vlc_filter.h"
  39
  40 /*****************************************************************************
  41  * Local prototypes
  42  *****************************************************************************/
  43 static int  Create    ( vlc_object_t * );
  44 static void Destroy   ( vlc_object_t * );
  45
  46 static picture_t *Filter( filter_t *, picture_t * );
  47
  48 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
  49                            vlc_value_t oldval, vlc_value_t newval,
  50                            void *p_data );
  51
  52 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
  53                            vlc_value_t oldval, vlc_value_t newval,
  54                            void *p_data );
  55
  56 #define ANGLE_TEXT N_("Angle in degrees")
  57 #define ANGLE_LONGTEXT N_("Angle in degrees (0 to 359)")
  58
  59 #define FILTER_PREFIX "rotate-"
  60
  61 /*****************************************************************************
  62  * Module descriptor
  63  *****************************************************************************/
  64 vlc_module_begin();
  65     set_description( _("Rotate video filter") );
  66     set_shortname( _( "Rotate" ));
  67     set_capability( "video filter2", 0 );
  68     set_category( CAT_VIDEO );
  69     set_subcategory( SUBCAT_VIDEO_VFILTER );
  70
  71     add_integer_with_range( FILTER_PREFIX "angle", 30, 0, 359, NULL,
  72         ANGLE_TEXT, ANGLE_LONGTEXT, false );
  73
  74     add_shortcut( "rotate" );
  75     set_callbacks( Create, Destroy );
  76 vlc_module_end();
  77
  78 static const char *ppsz_filter_options[] = {
  79     "angle", NULL
  80 };
  81
  82 /*****************************************************************************
  83  * filter_sys_t
  84  *****************************************************************************/
  85 struct filter_sys_t
  86 {
  87     int     i_angle;
  88     int     i_cos;
  89     int     i_sin;
  90 };
  91
  92 static inline void cache_trigo( int i_angle, int *i_sin, int *i_cos )
  93 {
  94     const double f_angle = (((double)i_angle)*M_PI)/1800.;
  95     *i_sin = (int)(sin( f_angle )*4096.);
  96     *i_cos = (int)(cos( f_angle )*4096.);
  97 }
  98
  99 /*****************************************************************************
 100  * Create: allocates Distort video filter
 101  *****************************************************************************/
 102 static int Create( vlc_object_t *p_this )
 103 {
 104     filter_t *p_filter = (filter_t *)p_this;
 105     filter_sys_t *p_sys;
 106
 107     if(   p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0')
 108        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','Y','U','V')
 109        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','0')
 110        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2')
 111
 112        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','2')
 113        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','2')
 114       )
 115     {
 116         /* We only want planar YUV 4:2:0 or 4:2:2 */
 117         msg_Err( p_filter, "Unsupported input chroma (%4s)",
 118                  (char*)&(p_filter->fmt_in.video.i_chroma) );
 119         return VLC_EGENERIC;
 120     }
 121
 122     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 123     {
 124         msg_Err( p_filter, "Input and output chromas don't match" );
 125         return VLC_EGENERIC;
 126     }
 127
 128     /* Allocate structure */
 129     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 130     if( p_filter->p_sys == NULL )
 131     {
 132         msg_Err( p_filter, "out of memory" );
 133         return VLC_ENOMEM;
 134     }
 135     p_sys = p_filter->p_sys;
 136
 137     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 138                        p_filter->p_cfg );
 139
 140     p_sys->i_angle = var_CreateGetIntegerCommand( p_filter,
 141                                                   FILTER_PREFIX "angle" ) * 10;
 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     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 149
 150     p_filter->pf_video_filter = Filter;
 151
 152     return VLC_SUCCESS;
 153 }
 154
 155 /*****************************************************************************
 156  * Destroy: destroy Distort filter
 157  *****************************************************************************/
 158 static void Destroy( vlc_object_t *p_this )
 159 {
 160     filter_t *p_filter = (filter_t *)p_this;
 161
 162     free( p_filter->p_sys );
 163 }
 164
 165 /*****************************************************************************
 166  *
 167  *****************************************************************************/
 168 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 169 {
 170     picture_t *p_outpic;
 171     filter_sys_t *p_sys = p_filter->p_sys;
 172     int i_plane;
 173     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
 174
 175     if( !p_pic ) return NULL;
 176
 177     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 178     if( !p_outpic )
 179     {
 180         msg_Warn( p_filter, "can't get output picture" );
 181         if( p_pic->pf_release )
 182             p_pic->pf_release( p_pic );
 183         return NULL;
 184     }
 185
 186     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 187     {
 188         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 189         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 190         const int i_pitch         = p_pic->p[i_plane].i_pitch;
 191         const int i_hidden_pitch  = i_pitch - i_visible_pitch;
 192
 193         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 );
 194         /* = 2 for U and V planes in YUV 4:2:2, = 1 otherwise */
 195
 196         const int i_line_center = i_visible_lines>>1;
 197         const int i_col_center  = i_visible_pitch>>1;
 198
 199         const uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 200         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 201         uint8_t *p_outendline = p_out + i_visible_pitch;
 202         const uint8_t *p_outend = p_out + i_visible_lines * i_pitch;
 203
 204         const uint8_t black_pixel = ( i_plane == Y_PLANE ) ? 0x00 : 0x80;
 205
 206         const int i_line_next =  i_cos / i_aspect -i_sin*i_visible_pitch;
 207         const int i_col_next  = -i_sin / i_aspect -i_cos*i_visible_pitch;
 208         int i_line_orig0 = ( - i_cos * i_line_center / i_aspect
 209                              - i_sin * i_col_center + (1<<11) );
 210         int i_col_orig0 =    i_sin * i_line_center / i_aspect
 211                            - i_cos * i_col_center + (1<<11);
 212         for( ; p_outendline < p_outend;
 213              p_out += i_hidden_pitch, p_outendline += i_pitch,
 214              i_line_orig0 += i_line_next, i_col_orig0 += i_col_next )
 215         {
 216             for( ; p_out < p_outendline;
 217                  p_out++, i_line_orig0 += i_sin, i_col_orig0 += i_cos )
 218             {
 219                 const int i_line_orig = (i_line_orig0>>12)*i_aspect + i_line_center;
 220                 const int i_col_orig  = (i_col_orig0>>12)  + i_col_center;
 221                 const uint8_t* p_orig_offset = p_in + i_line_orig * i_pitch
 222                                                 + i_col_orig;
 223                 const uint8_t i_line_percent = (i_line_orig0>>4) & 255;
 224                 const uint8_t i_col_percent  = (i_col_orig0 >>4) & 255;
 225
 226                 if(    -1 <= i_line_orig && i_line_orig < i_visible_lines
 227                     && -1 <= i_col_orig  && i_col_orig  < i_visible_pitch )
 228                 {
 229                 #define test 1
 230                 #undef test
 231                 #ifdef test
 232                     if( ( i_col_orig > i_visible_pitch/2 ) )
 233                 #endif
 234                     {
 235                         uint8_t i_curpix = black_pixel;
 236                         uint8_t i_colpix = black_pixel;
 237                         uint8_t i_linpix = black_pixel;
 238                         uint8_t i_nexpix = black_pixel;
 239                         if( ( 0 <= i_line_orig ) && ( 0 <= i_col_orig ) )
 240                             i_curpix = *p_orig_offset;
 241                         p_orig_offset++;
 242
 243                         if(  ( i_col_orig < i_visible_pitch - 1)
 244                              && ( i_line_orig >= 0 ) )
 245                             i_colpix = *p_orig_offset;
 246
 247                         p_orig_offset+=i_pitch;
 248                         if( ( i_line_orig < i_visible_lines - 1)
 249                             && ( i_col_orig  < i_visible_pitch - 1) )
 250                             i_nexpix = *p_orig_offset;
 251
 252                         p_orig_offset--;
 253                         if(  ( i_line_orig < i_visible_lines - 1)
 254                              && ( i_col_orig >= 0 ) )
 255                             i_linpix = *p_orig_offset;
 256
 257                         unsigned int temp = 0;
 258                         temp+= i_curpix *
 259                             (256 - i_line_percent) * ( 256 - i_col_percent );
 260                         temp+= i_linpix *
 261                             i_line_percent * (256 - i_col_percent );
 262                         temp+= i_nexpix *
 263                             ( i_col_percent) * ( i_line_percent);
 264                         temp+= i_colpix *
 265                             i_col_percent * (256 - i_line_percent );
 266                         *p_out = temp >> 16;
 267                     }
 268                 #ifdef test
 269                     else if (i_col_orig == i_visible_pitch/2 )
 270                     {   *p_out = black_pixel;
 271                     }
 272                     else
 273                         *p_out = *p_orig_offset;
 274                 #endif
 275                 #undef test
 276                 }
 277                 else
 278                 {
 279                     *p_out = black_pixel;
 280                 }
 281             }
 282         }
 283     }
 284
 285     p_outpic->date = p_pic->date;
 286     p_outpic->b_force = p_pic->b_force;
 287     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 288     p_outpic->b_progressive = p_pic->b_progressive;
 289     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 290
 291     if( p_pic->pf_release )
 292         p_pic->pf_release( p_pic );
 293
 294     return p_outpic;
 295 }
 296
 297 /*****************************************************************************
 298  * Angle modification callbacks.
 299  *****************************************************************************/
 300 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
 301                            vlc_value_t oldval, vlc_value_t newval,
 302                            void *p_data )
 303 {
 304     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
 305     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 306     p_sys->i_angle = newval.i_int*10;
 307     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 308     return VLC_SUCCESS;
 309 }
 310
 311 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
 312                            vlc_value_t oldval, vlc_value_t newval,
 313                            void *p_data )
 314 {
 315     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
 316     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 317     p_sys->i_angle = newval.i_int;
 318     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 319     return VLC_SUCCESS;
 320 }