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         change_safe();
  69
  70     add_shortcut( "rotate" );
  71     set_callbacks( Create, Destroy );
  72 vlc_module_end();
  73
  74 static const char *ppsz_filter_options[] = {
  75     "angle", NULL
  76 };
  77
  78 /*****************************************************************************
  79  * filter_sys_t
  80  *****************************************************************************/
  81 struct filter_sys_t
  82 {
  83     int     i_angle;
  84     int     i_cos;
  85     int     i_sin;
  86 };
  87
  88 static inline void cache_trigo( int i_angle, int *i_sin, int *i_cos )
  89 {
  90     const double f_angle = (((double)i_angle)*M_PI)/1800.;
  91     *i_sin = (int)(sin( f_angle )*4096.);
  92     *i_cos = (int)(cos( f_angle )*4096.);
  93 }
  94
  95 /*****************************************************************************
  96  * Create: allocates Distort video filter
  97  *****************************************************************************/
  98 static int Create( vlc_object_t *p_this )
  99 {
 100     filter_t *p_filter = (filter_t *)p_this;
 101     filter_sys_t *p_sys;
 102
 103     if(   p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','0')
 104        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','Y','U','V')
 105        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','0')
 106        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','V','1','2')
 107
 108        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('I','4','2','2')
 109        && p_filter->fmt_in.video.i_chroma != VLC_FOURCC('J','4','2','2')
 110       )
 111     {
 112         /* We only want planar YUV 4:2:0 or 4:2:2 */
 113         msg_Err( p_filter, "Unsupported input chroma (%4s)",
 114                  (char*)&(p_filter->fmt_in.video.i_chroma) );
 115         return VLC_EGENERIC;
 116     }
 117
 118     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 119     {
 120         msg_Err( p_filter, "Input and output chromas don't match" );
 121         return VLC_EGENERIC;
 122     }
 123
 124     /* Allocate structure */
 125     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 126     if( p_filter->p_sys == NULL )
 127     {
 128         msg_Err( p_filter, "out of memory" );
 129         return VLC_ENOMEM;
 130     }
 131     p_sys = p_filter->p_sys;
 132
 133     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 134                        p_filter->p_cfg );
 135
 136     p_sys->i_angle = var_CreateGetIntegerCommand( p_filter,
 137                                                   FILTER_PREFIX "angle" ) * 10;
 138     var_Create( p_filter, FILTER_PREFIX "deciangle",
 139                 VLC_VAR_INTEGER|VLC_VAR_ISCOMMAND );
 140     var_AddCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_sys );
 141     var_AddCallback( p_filter, FILTER_PREFIX "deciangle",
 142                      PreciseRotateCallback, p_sys );
 143
 144     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 145
 146     p_filter->pf_video_filter = Filter;
 147
 148     return VLC_SUCCESS;
 149 }
 150
 151 /*****************************************************************************
 152  * Destroy: destroy Distort filter
 153  *****************************************************************************/
 154 static void Destroy( vlc_object_t *p_this )
 155 {
 156     filter_t *p_filter = (filter_t *)p_this;
 157
 158     free( p_filter->p_sys );
 159 }
 160
 161 /*****************************************************************************
 162  *
 163  *****************************************************************************/
 164 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 165 {
 166     picture_t *p_outpic;
 167     filter_sys_t *p_sys = p_filter->p_sys;
 168     int i_plane;
 169     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
 170
 171     if( !p_pic ) return NULL;
 172
 173     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 174     if( !p_outpic )
 175     {
 176         msg_Warn( p_filter, "can't get output picture" );
 177         if( p_pic->pf_release )
 178             p_pic->pf_release( p_pic );
 179         return NULL;
 180     }
 181
 182     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 183     {
 184         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 185         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 186         const int i_pitch         = p_pic->p[i_plane].i_pitch;
 187         const int i_hidden_pitch  = i_pitch - i_visible_pitch;
 188
 189         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 );
 190         /* = 2 for U and V planes in YUV 4:2:2, = 1 otherwise */
 191
 192         const int i_line_center = i_visible_lines>>1;
 193         const int i_col_center  = i_visible_pitch>>1;
 194
 195         const uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 196         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 197         uint8_t *p_outendline = p_out + i_visible_pitch;
 198         const uint8_t *p_outend = p_out + i_visible_lines * i_pitch;
 199
 200         const uint8_t black_pixel = ( i_plane == Y_PLANE ) ? 0x00 : 0x80;
 201
 202         const int i_line_next =  i_cos / i_aspect -i_sin*i_visible_pitch;
 203         const int i_col_next  = -i_sin / i_aspect -i_cos*i_visible_pitch;
 204         int i_line_orig0 = ( - i_cos * i_line_center / i_aspect
 205                              - i_sin * i_col_center + (1<<11) );
 206         int i_col_orig0 =    i_sin * i_line_center / i_aspect
 207                            - i_cos * i_col_center + (1<<11);
 208         for( ; p_outendline < p_outend;
 209              p_out += i_hidden_pitch, p_outendline += i_pitch,
 210              i_line_orig0 += i_line_next, i_col_orig0 += i_col_next )
 211         {
 212             for( ; p_out < p_outendline;
 213                  p_out++, i_line_orig0 += i_sin, i_col_orig0 += i_cos )
 214             {
 215                 const int i_line_orig = (i_line_orig0>>12)*i_aspect + i_line_center;
 216                 const int i_col_orig  = (i_col_orig0>>12)  + i_col_center;
 217                 const uint8_t* p_orig_offset = p_in + i_line_orig * i_pitch
 218                                                 + i_col_orig;
 219                 const uint8_t i_line_percent = (i_line_orig0>>4) & 255;
 220                 const uint8_t i_col_percent  = (i_col_orig0 >>4) & 255;
 221
 222                 if(    -1 <= i_line_orig && i_line_orig < i_visible_lines
 223                     && -1 <= i_col_orig  && i_col_orig  < i_visible_pitch )
 224                 {
 225                 #define test 1
 226                 #undef test
 227                 #ifdef test
 228                     if( ( i_col_orig > i_visible_pitch/2 ) )
 229                 #endif
 230                     {
 231                         uint8_t i_curpix = black_pixel;
 232                         uint8_t i_colpix = black_pixel;
 233                         uint8_t i_linpix = black_pixel;
 234                         uint8_t i_nexpix = black_pixel;
 235                         if( ( 0 <= i_line_orig ) && ( 0 <= i_col_orig ) )
 236                             i_curpix = *p_orig_offset;
 237                         p_orig_offset++;
 238
 239                         if(  ( i_col_orig < i_visible_pitch - 1)
 240                              && ( i_line_orig >= 0 ) )
 241                             i_colpix = *p_orig_offset;
 242
 243                         p_orig_offset+=i_pitch;
 244                         if( ( i_line_orig < i_visible_lines - 1)
 245                             && ( i_col_orig  < i_visible_pitch - 1) )
 246                             i_nexpix = *p_orig_offset;
 247
 248                         p_orig_offset--;
 249                         if(  ( i_line_orig < i_visible_lines - 1)
 250                              && ( i_col_orig >= 0 ) )
 251                             i_linpix = *p_orig_offset;
 252
 253                         unsigned int temp = 0;
 254                         temp+= i_curpix *
 255                             (256 - i_line_percent) * ( 256 - i_col_percent );
 256                         temp+= i_linpix *
 257                             i_line_percent * (256 - i_col_percent );
 258                         temp+= i_nexpix *
 259                             ( i_col_percent) * ( i_line_percent);
 260                         temp+= i_colpix *
 261                             i_col_percent * (256 - i_line_percent );
 262                         *p_out = temp >> 16;
 263                     }
 264                 #ifdef test
 265                     else if (i_col_orig == i_visible_pitch/2 )
 266                     {   *p_out = black_pixel;
 267                     }
 268                     else
 269                         *p_out = *p_orig_offset;
 270                 #endif
 271                 #undef test
 272                 }
 273                 else
 274                 {
 275                     *p_out = black_pixel;
 276                 }
 277             }
 278         }
 279     }
 280
 281     p_outpic->date = p_pic->date;
 282     p_outpic->b_force = p_pic->b_force;
 283     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 284     p_outpic->b_progressive = p_pic->b_progressive;
 285     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 286
 287     if( p_pic->pf_release )
 288         p_pic->pf_release( p_pic );
 289
 290     return p_outpic;
 291 }
 292
 293 /*****************************************************************************
 294  * Angle modification callbacks.
 295  *****************************************************************************/
 296 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
 297                            vlc_value_t oldval, vlc_value_t newval,
 298                            void *p_data )
 299 {
 300     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 301     p_sys->i_angle = newval.i_int*10;
 302     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 303     return VLC_SUCCESS;
 304 }
 305
 306 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
 307                            vlc_value_t oldval, vlc_value_t newval,
 308                            void *p_data )
 309 {
 310     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 311     p_sys->i_angle = newval.i_int;
 312     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 313     return VLC_SUCCESS;
 314 }