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_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
  49 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
  50                            vlc_value_t oldval, vlc_value_t newval,
  51                            void *p_data );
  52
  53 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
  54                            vlc_value_t oldval, vlc_value_t newval,
  55                            void *p_data );
  56
  57 #define ANGLE_TEXT N_("Angle in degrees")
  58 #define ANGLE_LONGTEXT N_("Angle in degrees (0 to 359)")
  59
  60 #define FILTER_PREFIX "rotate-"
  61
  62 /*****************************************************************************
  63  * Module descriptor
  64  *****************************************************************************/
  65 vlc_module_begin();
  66     set_description( N_("Rotate video filter") );
  67     set_shortname( N_( "Rotate" ));
  68     set_capability( "video filter2", 0 );
  69     set_category( CAT_VIDEO );
  70     set_subcategory( SUBCAT_VIDEO_VFILTER );
  71
  72     add_integer_with_range( FILTER_PREFIX "angle", 30, 0, 359, NULL,
  73         ANGLE_TEXT, ANGLE_LONGTEXT, false );
  74
  75     add_shortcut( "rotate" );
  76     set_callbacks( Create, Destroy );
  77 vlc_module_end();
  78
  79 static const char *const ppsz_filter_options[] = {
  80     "angle", NULL
  81 };
  82
  83 /*****************************************************************************
  84  * filter_sys_t
  85  *****************************************************************************/
  86 struct filter_sys_t
  87 {
  88     int     i_angle;
  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     switch( p_filter->fmt_in.video.i_chroma )
 109     {
 110         CASE_PLANAR_YUV
 111             break;
 112
 113         default:
 114             msg_Err( p_filter, "Unsupported input chroma (%4s)",
 115                      (char*)&(p_filter->fmt_in.video.i_chroma) );
 116             return VLC_EGENERIC;
 117     }
 118
 119     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 120     {
 121         msg_Err( p_filter, "Input and output chromas don't match" );
 122         return VLC_EGENERIC;
 123     }
 124
 125     /* Allocate structure */
 126     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 127     if( p_filter->p_sys == NULL )
 128     {
 129         msg_Err( p_filter, "out of memory" );
 130         return VLC_ENOMEM;
 131     }
 132     p_sys = p_filter->p_sys;
 133
 134     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 135                        p_filter->p_cfg );
 136
 137     p_sys->i_angle = var_CreateGetIntegerCommand( p_filter,
 138                                                   FILTER_PREFIX "angle" ) * 10;
 139     var_Create( p_filter, FILTER_PREFIX "deciangle",
 140                 VLC_VAR_INTEGER|VLC_VAR_ISCOMMAND );
 141     var_AddCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_sys );
 142     var_AddCallback( p_filter, FILTER_PREFIX "deciangle",
 143                      PreciseRotateCallback, p_sys );
 144
 145     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 146
 147     p_filter->pf_video_filter = Filter;
 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     free( p_filter->p_sys );
 160 }
 161
 162 /*****************************************************************************
 163  *
 164  *****************************************************************************/
 165 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 166 {
 167     picture_t *p_outpic;
 168     filter_sys_t *p_sys = p_filter->p_sys;
 169     int i_plane;
 170     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
 171
 172     if( !p_pic ) return NULL;
 173
 174     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 175     if( !p_outpic )
 176     {
 177         msg_Warn( p_filter, "can't get output picture" );
 178         if( p_pic->pf_release )
 179             p_pic->pf_release( p_pic );
 180         return NULL;
 181     }
 182
 183     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 184     {
 185         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 186         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 187         const int i_pitch         = p_pic->p[i_plane].i_pitch;
 188         const int i_hidden_pitch  = i_pitch - i_visible_pitch;
 189
 190         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 );
 191         /* = 2 for U and V planes in YUV 4:2:2, = 1 otherwise */
 192
 193         const int i_line_center = i_visible_lines>>1;
 194         const int i_col_center  = i_visible_pitch>>1;
 195
 196         const uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 197         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 198         uint8_t *p_outendline = p_out + i_visible_pitch;
 199         const uint8_t *p_outend = p_out + i_visible_lines * i_pitch;
 200
 201         const uint8_t black_pixel = ( i_plane == Y_PLANE ) ? 0x00 : 0x80;
 202
 203         const int i_line_next =  i_cos / i_aspect -i_sin*i_visible_pitch;
 204         const int i_col_next  = -i_sin / i_aspect -i_cos*i_visible_pitch;
 205         int i_line_orig0 = ( - i_cos * i_line_center / i_aspect
 206                              - i_sin * i_col_center + (1<<11) );
 207         int i_col_orig0 =    i_sin * i_line_center / i_aspect
 208                            - i_cos * i_col_center + (1<<11);
 209         for( ; p_outendline < p_outend;
 210              p_out += i_hidden_pitch, p_outendline += i_pitch,
 211              i_line_orig0 += i_line_next, i_col_orig0 += i_col_next )
 212         {
 213             for( ; p_out < p_outendline;
 214                  p_out++, i_line_orig0 += i_sin, i_col_orig0 += i_cos )
 215             {
 216                 const int i_line_orig = (i_line_orig0>>12)*i_aspect + i_line_center;
 217                 const int i_col_orig  = (i_col_orig0>>12)  + i_col_center;
 218                 const uint8_t* p_orig_offset = p_in + i_line_orig * i_pitch
 219                                                 + i_col_orig;
 220                 const uint8_t i_line_percent = (i_line_orig0>>4) & 255;
 221                 const uint8_t i_col_percent  = (i_col_orig0 >>4) & 255;
 222
 223                 if(    -1 <= i_line_orig && i_line_orig < i_visible_lines
 224                     && -1 <= i_col_orig  && i_col_orig  < i_visible_pitch )
 225                 {
 226                 #define test 1
 227                 #undef test
 228                 #ifdef test
 229                     if( ( i_col_orig > i_visible_pitch/2 ) )
 230                 #endif
 231                     {
 232                         uint8_t i_curpix = black_pixel;
 233                         uint8_t i_colpix = black_pixel;
 234                         uint8_t i_linpix = black_pixel;
 235                         uint8_t i_nexpix = black_pixel;
 236                         if( ( 0 <= i_line_orig ) && ( 0 <= i_col_orig ) )
 237                             i_curpix = *p_orig_offset;
 238                         p_orig_offset++;
 239
 240                         if(  ( i_col_orig < i_visible_pitch - 1)
 241                              && ( i_line_orig >= 0 ) )
 242                             i_colpix = *p_orig_offset;
 243
 244                         p_orig_offset+=i_pitch;
 245                         if( ( i_line_orig < i_visible_lines - 1)
 246                             && ( i_col_orig  < i_visible_pitch - 1) )
 247                             i_nexpix = *p_orig_offset;
 248
 249                         p_orig_offset--;
 250                         if(  ( i_line_orig < i_visible_lines - 1)
 251                              && ( i_col_orig >= 0 ) )
 252                             i_linpix = *p_orig_offset;
 253
 254                         unsigned int temp = 0;
 255                         temp+= i_curpix *
 256                             (256 - i_line_percent) * ( 256 - i_col_percent );
 257                         temp+= i_linpix *
 258                             i_line_percent * (256 - i_col_percent );
 259                         temp+= i_nexpix *
 260                             ( i_col_percent) * ( i_line_percent);
 261                         temp+= i_colpix *
 262                             i_col_percent * (256 - i_line_percent );
 263                         *p_out = temp >> 16;
 264                     }
 265                 #ifdef test
 266                     else if (i_col_orig == i_visible_pitch/2 )
 267                     {   *p_out = black_pixel;
 268                     }
 269                     else
 270                         *p_out = *p_orig_offset;
 271                 #endif
 272                 #undef test
 273                 }
 274                 else
 275                 {
 276                     *p_out = black_pixel;
 277                 }
 278             }
 279         }
 280     }
 281
 282     p_outpic->date = p_pic->date;
 283     p_outpic->b_force = p_pic->b_force;
 284     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 285     p_outpic->b_progressive = p_pic->b_progressive;
 286     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 287
 288     if( p_pic->pf_release )
 289         p_pic->pf_release( p_pic );
 290
 291     return p_outpic;
 292 }
 293
 294 /*****************************************************************************
 295  * Angle modification callbacks.
 296  *****************************************************************************/
 297 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
 298                            vlc_value_t oldval, vlc_value_t newval,
 299                            void *p_data )
 300 {
 301     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
 302     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 303     p_sys->i_angle = newval.i_int*10;
 304     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 305     return VLC_SUCCESS;
 306 }
 307
 308 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
 309                            vlc_value_t oldval, vlc_value_t newval,
 310                            void *p_data )
 311 {
 312     VLC_UNUSED(p_this); VLC_UNUSED(psz_var); VLC_UNUSED(oldval);
 313     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 314     p_sys->i_angle = newval.i_int;
 315     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 316     return VLC_SUCCESS;
 317 }