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 #include <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>
  29
  30 #include <math.h>                                            /* sin(), cos() */
  31
  32 #include <vlc/vlc.h>
  33 #include <vlc_vout.h>
  34
  35 #include "vlc_filter.h"
  36
  37 /*****************************************************************************
  38  * Local prototypes
  39  *****************************************************************************/
  40 static int  Create    ( vlc_object_t * );
  41 static void Destroy   ( vlc_object_t * );
  42
  43 static picture_t *Filter( filter_t *, picture_t * );
  44
  45 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
  46                            vlc_value_t oldval, vlc_value_t newval,
  47                            void *p_data );
  48
  49 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
  50                            vlc_value_t oldval, vlc_value_t newval,
  51                            void *p_data );
  52
  53 #define ANGLE_TEXT N_("Angle in degrees")
  54 #define ANGLE_LONGTEXT N_("Angle in degrees (0 to 359)")
  55
  56 #define FILTER_PREFIX "rotate-"
  57
  58 /*****************************************************************************
  59  * Module descriptor
  60  *****************************************************************************/
  61 vlc_module_begin();
  62     set_description( _("Rotate video filter") );
  63     set_shortname( _( "Rotate" ));
  64     set_capability( "video filter2", 0 );
  65     set_category( CAT_VIDEO );
  66     set_subcategory( SUBCAT_VIDEO_VFILTER );
  67
  68     add_integer_with_range( FILTER_PREFIX "angle", 0, 0, 359, NULL,
  69         ANGLE_TEXT, ANGLE_LONGTEXT, VLC_FALSE );
  70
  71     add_shortcut( "rotate" );
  72     set_callbacks( Create, Destroy );
  73 vlc_module_end();
  74
  75 static const char *ppsz_filter_options[] = {
  76     "angle", NULL
  77 };
  78
  79 /*****************************************************************************
  80  * filter_sys_t
  81  *****************************************************************************/
  82 struct filter_sys_t
  83 {
  84     int     i_angle;
  85     int     i_cos;
  86     int     i_sin;
  87 };
  88
  89 static inline void cache_trigo( int i_angle, int *i_sin, int *i_cos )
  90 {
  91     const double f_angle = (((double)i_angle)*M_PI)/1800.;
  92     *i_sin = (int)(sin( f_angle )*4096.);
  93     *i_cos = (int)(cos( f_angle )*4096.);
  94 }
  95
  96 /*****************************************************************************
  97  * Create: allocates Distort video filter
  98  *****************************************************************************/
  99 static int Create( vlc_object_t *p_this )
 100 {
 101     filter_t *p_filter = (filter_t *)p_this;
 102     filter_sys_t *p_sys;
 103
 104     /* Allocate structure */
 105     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 106     if( p_filter->p_sys == NULL )
 107     {
 108         msg_Err( p_filter, "out of memory" );
 109         return VLC_ENOMEM;
 110     }
 111     p_sys = p_filter->p_sys;
 112
 113     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 114                        p_filter->p_cfg );
 115
 116     p_sys->i_angle = var_CreateGetIntegerCommand( p_filter,
 117                                                   FILTER_PREFIX "angle" ) * 10;
 118     var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "deciangle" );
 119     var_AddCallback( p_filter, FILTER_PREFIX "angle", RotateCallback, p_sys );
 120     var_AddCallback( p_filter, FILTER_PREFIX "deciangle", PreciseRotateCallback, p_sys );
 121
 122     cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 123
 124     p_filter->pf_video_filter = Filter;
 125
 126     return VLC_SUCCESS;
 127 }
 128
 129 /*****************************************************************************
 130  * Destroy: destroy Distort filter
 131  *****************************************************************************/
 132 static void Destroy( vlc_object_t *p_this )
 133 {
 134     filter_t *p_filter = (filter_t *)p_this;
 135
 136     free( p_filter->p_sys );
 137 }
 138
 139 /*****************************************************************************
 140  *
 141  *****************************************************************************/
 142 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 143 {
 144     picture_t *p_outpic;
 145     filter_sys_t *p_sys = p_filter->p_sys;
 146     int i_plane;
 147     const int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
 148
 149     if( !p_pic ) return NULL;
 150
 151     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 152     if( !p_outpic )
 153     {
 154         msg_Warn( p_filter, "can't get output picture" );
 155         if( p_pic->pf_release )
 156             p_pic->pf_release( p_pic );
 157         return NULL;
 158     }
 159
 160     for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
 161     {
 162         const int i_visible_lines = p_pic->p[i_plane].i_visible_lines;
 163         const int i_visible_pitch = p_pic->p[i_plane].i_visible_pitch;
 164         const int i_pitch         = p_pic->p[i_plane].i_pitch;
 165         const int i_hidden_pitch  = i_pitch - i_visible_pitch;
 166
 167         const int i_line_center = i_visible_lines>>1;
 168         const int i_col_center  = i_visible_pitch>>1;
 169
 170         const uint8_t *p_in = p_pic->p[i_plane].p_pixels;
 171         uint8_t *p_out = p_outpic->p[i_plane].p_pixels;
 172         uint8_t *p_outendline = p_out + i_visible_pitch;
 173         const uint8_t *p_outend = p_out + i_visible_lines * i_pitch;
 174
 175         const uint8_t black_pixel = ( i_plane == Y_PLANE ) ? 0x00 : 0x80;
 176
 177         const int i_line_next =  i_cos-i_sin*i_visible_pitch;
 178         const int i_col_next  = -i_sin-i_cos*i_visible_pitch;
 179         int i_line_orig0 = - i_cos * i_line_center
 180                            - i_sin * i_col_center + (1<<11);
 181         int i_col_orig0 =    i_sin * i_line_center
 182                            - i_cos * i_col_center + (1<<11);
 183         for( ; p_outendline < p_outend;
 184              p_out += i_hidden_pitch, p_outendline += i_pitch,
 185              i_line_orig0 += i_line_next, i_col_orig0 += i_col_next )
 186         {
 187             for( ; p_out < p_outendline;
 188                  p_out++, i_line_orig0 += i_sin, i_col_orig0 += i_cos )
 189             {
 190                 const int i_line_orig = (i_line_orig0>>12) + i_line_center;
 191                 const int i_col_orig  = (i_col_orig0>>12)  + i_col_center;
 192                 int i_line_percent = (i_line_orig0>>4) & 255;
 193                 int i_col_percent  = (i_col_orig0 >>4) & 255;
 194
 195                 if(    0 < i_line_orig && i_line_orig < i_visible_lines - 1
 196                     && 0 < i_col_orig  && i_col_orig  < i_visible_pitch - 1)
 197                 {
 198                 #define test 1
 199                 #undef test
 200                 #ifdef test
 201                     if( ( i_col_orig > i_visible_pitch/2 ) )
 202                 #endif
 203                     {
 204                         unsigned int temp = 0;
 205                         temp+= p_in[i_line_orig*i_pitch+i_col_orig] *
 206                             (256 - i_line_percent) * ( 256 - i_col_percent );
 207                         temp+= p_in[(i_line_orig+1)*i_pitch+i_col_orig] *
 208                             i_line_percent * (256 - i_col_percent );
 209                         temp+= p_in[(i_line_orig+1)*i_pitch+i_col_orig+1] *
 210                             ( i_col_percent) * ( i_line_percent);
 211                         temp+= p_in[i_line_orig*i_pitch+i_col_orig+1] *
 212                             i_col_percent * (256 - i_line_percent );
 213                         *p_out = temp >> 16;
 214                     }
 215                 #ifdef test
 216                     else if (i_col_orig == i_visible_pitch/2 )
 217                     {   *p_out = black_pixel;
 218                     }
 219                     else
 220                         *p_out = p_in[i_line_orig*i_pitch+i_col_orig];
 221                 #endif
 222                 #undef test
 223                 }
 224                 else
 225                 {
 226                     *p_out = black_pixel;
 227                 }
 228             }
 229         }
 230     }
 231
 232     p_outpic->date = p_pic->date;
 233     p_outpic->b_force = p_pic->b_force;
 234     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 235     p_outpic->b_progressive = p_pic->b_progressive;
 236     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 237
 238     if( p_pic->pf_release )
 239         p_pic->pf_release( p_pic );
 240
 241     return p_outpic;
 242 }
 243
 244 /*****************************************************************************
 245  *
 246  *****************************************************************************/
 247 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
 248                            vlc_value_t oldval, vlc_value_t newval,
 249                            void *p_data )
 250 {
 251     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 252
 253     if( !strcmp( psz_var, "rotate-angle" ) )
 254     {
 255         p_sys->i_angle = newval.i_int*10;
 256
 257         cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 258     }
 259     return VLC_SUCCESS;
 260 }
 261 static int PreciseRotateCallback( vlc_object_t *p_this, char const *psz_var,
 262                            vlc_value_t oldval, vlc_value_t newval,
 263                            void *p_data )
 264 {
 265     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 266
 267     if( !strcmp( psz_var, "rotate-deciangle" ) )
 268     {
 269         p_sys->i_angle = newval.i_int;
 270
 271         cache_trigo( p_sys->i_angle, &p_sys->i_sin, &p_sys->i_cos );
 272     }
 273     return VLC_SUCCESS;
 274 }