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/decoder.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 #define ANGLE_TEXT N_("Angle in degrees")
  50 #define ANGLE_LONGTEXT N_("Angle in degrees (0 to 359)")
  51
  52 #define FILTER_PREFIX "rotate-"
  53
  54 /*****************************************************************************
  55  * Module descriptor
  56  *****************************************************************************/
  57 vlc_module_begin();
  58     set_description( _("Rotate video filter") );
  59     set_shortname( _( "Rotate" ));
  60     set_capability( "video filter2", 0 );
  61     set_category( CAT_VIDEO );
  62     set_subcategory( SUBCAT_VIDEO_VFILTER );
  63
  64     add_integer_with_range( FILTER_PREFIX "angle", 0, 0, 359, NULL,
  65         ANGLE_TEXT, ANGLE_LONGTEXT, VLC_FALSE );
  66
  67     add_shortcut( "rotate" );
  68     set_callbacks( Create, Destroy );
  69 vlc_module_end();
  70
  71 static const char *ppsz_filter_options[] = {
  72     "angle", NULL
  73 };
  74
  75 /*****************************************************************************
  76  * vout_sys_t: Distort video output method descriptor
  77  *****************************************************************************
  78  * This structure is part of the video output thread descriptor.
  79  * It describes the Distort specific properties of an output thread.
  80  *****************************************************************************/
  81 struct filter_sys_t
  82 {
  83     int     i_angle;
  84     int     i_cos;
  85     int     i_sin;
  86
  87     mtime_t last_date;
  88 };
  89
  90 /*****************************************************************************
  91  * Create: allocates Distort video thread output method
  92  *****************************************************************************
  93  * This function allocates and initializes a Distort vout method.
  94  *****************************************************************************/
  95 static int Create( vlc_object_t *p_this )
  96 {
  97     filter_t *p_filter = (filter_t *)p_this;
  98
  99     /* Allocate structure */
 100     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 101     if( p_filter->p_sys == NULL )
 102     {
 103         msg_Err( p_filter, "out of memory" );
 104         return VLC_ENOMEM;
 105     }
 106
 107     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 108                        p_filter->p_cfg );
 109     var_Create( p_filter, FILTER_PREFIX "angle",
 110                 VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 111
 112     p_filter->pf_video_filter = Filter;
 113
 114     p_filter->p_sys->i_angle = var_GetInteger( p_filter,
 115                                                FILTER_PREFIX "angle" );
 116     p_filter->p_sys->last_date = 0;
 117
 118     var_Create( p_filter->p_libvlc, "rotate_angle", VLC_VAR_INTEGER );
 119     var_AddCallback( p_filter->p_libvlc,
 120                      "rotate_angle", RotateCallback, p_filter->p_sys );
 121     var_SetInteger( p_filter->p_libvlc, "rotate_angle",
 122                     p_filter->p_sys->i_angle );
 123
 124     return VLC_SUCCESS;
 125 }
 126
 127 /*****************************************************************************
 128  * Destroy: destroy Distort video thread output method
 129  *****************************************************************************
 130  * Terminate an output method created by DistortCreateOutputMethod
 131  *****************************************************************************/
 132 static void Destroy( vlc_object_t *p_this )
 133 {
 134     filter_t *p_filter = (filter_t *)p_this;
 135
 136     var_DelCallback( p_filter->p_libvlc,
 137                      "rotate_angle", RotateCallback, p_filter->p_sys );
 138     free( p_filter->p_sys );
 139 }
 140
 141 /*****************************************************************************
 142  * Render: displays previously rendered output
 143  *****************************************************************************
 144  * This function send the currently rendered image to Distort image, waits
 145  * until it is displayed and switch the two rendering buffers, preparing next
 146  * frame.
 147  *****************************************************************************/
 148 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 149 {
 150     picture_t *p_outpic;
 151     filter_sys_t *p_sys = p_filter->p_sys;
 152     int i_index;
 153     int i_sin = p_sys->i_sin, i_cos = p_sys->i_cos;
 154     mtime_t new_date = mdate();
 155
 156     if( !p_pic ) return NULL;
 157
 158     p_outpic = p_filter->pf_vout_buffer_new( p_filter );
 159     if( !p_outpic )
 160     {
 161         msg_Warn( p_filter, "can't get output picture" );
 162         if( p_pic->pf_release )
 163             p_pic->pf_release( p_pic );
 164         return NULL;
 165     }
 166
 167     p_sys->last_date = new_date;
 168
 169     for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
 170     {
 171         int i_line, i_num_lines, i_line_center, i_col, i_num_cols, i_col_center;
 172         uint8_t black_pixel;
 173         uint8_t *p_in, *p_out;
 174
 175         p_in = p_pic->p[i_index].p_pixels;
 176         p_out = p_outpic->p[i_index].p_pixels;
 177
 178         i_num_lines = p_pic->p[i_index].i_visible_lines;
 179         i_num_cols = p_pic->p[i_index].i_visible_pitch;
 180         i_line_center = i_num_lines/2;
 181         i_col_center = i_num_cols/2;
 182
 183         black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
 184
 185         for( i_line = 0 ; i_line < i_num_lines ; i_line++ )
 186         {
 187             for( i_col = 0; i_col < i_num_cols ; i_col++ )
 188             {
 189                 int i_line_orig, i_col_orig;
 190                 i_line_orig = ( ( i_cos * (i_line-i_line_center)
 191                                 + i_sin * (i_col-i_col_center)
 192                                 + 128 )>>8 )
 193                               + i_line_center;
 194                 i_col_orig = ( (-i_sin * (i_line-i_line_center)
 195                                + i_cos * (i_col-i_col_center)
 196                                + 128 )>>8 )
 197                              + i_col_center;
 198
 199                 if(    0 <= i_line_orig && i_line_orig < i_num_lines
 200                     && 0 <= i_col_orig && i_col_orig < i_num_cols )
 201                 {
 202
 203                     p_out[i_line*i_num_cols+i_col] =
 204                         p_in[i_line_orig*i_num_cols+i_col_orig];
 205                 }
 206                 else
 207                 {
 208                     p_out[i_line*i_num_cols+i_col] = black_pixel;
 209                 }
 210             }
 211         }
 212     }
 213
 214     p_outpic->date = p_pic->date;
 215     p_outpic->b_force = p_pic->b_force;
 216     p_outpic->i_nb_fields = p_pic->i_nb_fields;
 217     p_outpic->b_progressive = p_pic->b_progressive;
 218     p_outpic->b_top_field_first = p_pic->b_top_field_first;
 219
 220     if( p_pic->pf_release )
 221         p_pic->pf_release( p_pic );
 222
 223     return p_outpic;
 224 }
 225
 226 static int RotateCallback( vlc_object_t *p_this, char const *psz_var,
 227                            vlc_value_t oldval, vlc_value_t newval,
 228                            void *p_data )
 229 {
 230     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 231
 232     if( !strcmp( psz_var, "rotate_angle" ) )
 233     {
 234         double f_angle;
 235
 236         p_sys->i_angle = newval.i_int;
 237
 238         f_angle = (((double)p_sys->i_angle)*M_PI)/180.;
 239         p_sys->i_sin = (int)(sin( f_angle )*256.);
 240         p_sys->i_cos = (int)(cos( f_angle )*256.);
 241     }
 242     return VLC_SUCCESS;
 243 }