git.sesse.net Git - vlc/blob - modules/video_filter/distort.c

   1 /*****************************************************************************
   2  * distort.c : Misc video effects plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000, 2001, 2002, 2003 VideoLAN
   5  * $Id: distort.c,v 1.8 2003/03/18 23:30:28 gbazin Exp $
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.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., 59 Temple Place - Suite 330, Boston, MA  02111, 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 "filter_common.h"
  36
  37 #define DISTORT_MODE_WAVE    1
  38 #define DISTORT_MODE_RIPPLE  2
  39
  40 /*****************************************************************************
  41  * Local prototypes
  42  *****************************************************************************/
  43 static int  Create    ( vlc_object_t * );
  44 static void Destroy   ( vlc_object_t * );
  45
  46 static int  Init      ( vout_thread_t * );
  47 static void End       ( vout_thread_t * );
  48 static void Render    ( vout_thread_t *, picture_t * );
  49
  50 static void DistortWave    ( vout_thread_t *, picture_t *, picture_t * );
  51 static void DistortRipple  ( vout_thread_t *, picture_t *, picture_t * );
  52
  53 static int  SendEvents   ( vlc_object_t *, char const *,
  54                            vlc_value_t, vlc_value_t, void * );
  55
  56 /*****************************************************************************
  57  * Module descriptor
  58  *****************************************************************************/
  59 #define MODE_TEXT N_("distort mode")
  60 #define MODE_LONGTEXT N_("Distort mode, one of \"wave\" and \"ripple\"")
  61
  62 static char *mode_list[] = { "wave", "ripple", NULL };
  63
  64 vlc_module_begin();
  65     add_category_hint( N_("Distort"), NULL, VLC_FALSE );
  66     add_string_from_list( "distort-mode", "wave", mode_list, NULL,
  67                           MODE_TEXT, MODE_LONGTEXT, VLC_FALSE );
  68     set_description( _("miscellaneous video effects module") );
  69     set_capability( "video filter", 0 );
  70     add_shortcut( "distort" );
  71     set_callbacks( Create, Destroy );
  72 vlc_module_end();
  73
  74 /*****************************************************************************
  75  * vout_sys_t: Distort video output method descriptor
  76  *****************************************************************************
  77  * This structure is part of the video output thread descriptor.
  78  * It describes the Distort specific properties of an output thread.
  79  *****************************************************************************/
  80 struct vout_sys_t
  81 {
  82     int i_mode;
  83     vout_thread_t *p_vout;
  84
  85     /* For the wave mode */
  86     double  f_angle;
  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     vout_thread_t *p_vout = (vout_thread_t *)p_this;
  98     char *psz_method, *psz_method_tmp;
  99
 100     /* Allocate structure */
 101     p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
 102     if( p_vout->p_sys == NULL )
 103     {
 104         msg_Err( p_vout, "out of memory" );
 105         return VLC_ENOMEM;
 106     }
 107
 108     p_vout->pf_init = Init;
 109     p_vout->pf_end = End;
 110     p_vout->pf_manage = NULL;
 111     p_vout->pf_render = Render;
 112     p_vout->pf_display = NULL;
 113
 114     p_vout->p_sys->i_mode = 0;
 115     /* Look what method was requested from command line*/
 116     if( !(psz_method = psz_method_tmp = config_GetPsz( p_vout, "filter" )) )
 117     {
 118         msg_Err( p_vout, "configuration variable %s empty", "filter" );
 119         return VLC_EGENERIC;
 120     }
 121     while( *psz_method && *psz_method != ':' )
 122     {
 123         psz_method++;
 124     }
 125
 126     if( !strcmp( psz_method, ":wave" ) )
 127     {
 128         p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
 129     }
 130     else if( !strcmp( psz_method, ":ripple" ) )
 131     {
 132         p_vout->p_sys->i_mode = DISTORT_MODE_RIPPLE;
 133     }
 134     free( psz_method_tmp );
 135     if( !p_vout->p_sys->i_mode )
 136     {
 137         /* No method given in commandline. Look what method was
 138          requested in configuration system */
 139         if( !(psz_method = psz_method_tmp
 140               = config_GetPsz( p_vout, "distort-mode" )) )
 141         {
 142             msg_Err( p_vout, "configuration variable %s empty, using 'wave'",
 143                              "distort-mode" );
 144             p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
 145         }
 146         else {
 147
 148             if( !strcmp( psz_method, "wave" ) )
 149             {
 150                 p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
 151             }
 152             else if( !strcmp( psz_method, "ripple" ) )
 153             {
 154                 p_vout->p_sys->i_mode = DISTORT_MODE_RIPPLE;
 155             }
 156             else
 157             {
 158                 msg_Err( p_vout, "no valid distort mode provided, "
 159                                  "using wave" );
 160                 p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
 161             }
 162         }
 163     }
 164     free( psz_method_tmp );
 165
 166     return VLC_SUCCESS;
 167 }
 168
 169 /*****************************************************************************
 170  * Init: initialize Distort video thread output method
 171  *****************************************************************************/
 172 static int Init( vout_thread_t *p_vout )
 173 {
 174     int i_index;
 175     picture_t *p_pic;
 176
 177     I_OUTPUTPICTURES = 0;
 178
 179     /* Initialize the output structure */
 180     p_vout->output.i_chroma = p_vout->render.i_chroma;
 181     p_vout->output.i_width  = p_vout->render.i_width;
 182     p_vout->output.i_height = p_vout->render.i_height;
 183     p_vout->output.i_aspect = p_vout->render.i_aspect;
 184
 185     /* Try to open the real video output */
 186     msg_Dbg( p_vout, "spawning the real video output" );
 187
 188     p_vout->p_sys->p_vout = vout_Create( p_vout,
 189                            p_vout->render.i_width, p_vout->render.i_height,
 190                            p_vout->render.i_chroma, p_vout->render.i_aspect );
 191
 192     /* Everything failed */
 193     if( p_vout->p_sys->p_vout == NULL )
 194     {
 195         msg_Err( p_vout, "cannot open vout, aborting" );
 196
 197         return VLC_EGENERIC;
 198     }
 199
 200     ALLOCATE_DIRECTBUFFERS( VOUT_MAX_PICTURES );
 201
 202     ADD_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
 203
 204     p_vout->p_sys->f_angle = 0.0;
 205     p_vout->p_sys->last_date = 0;
 206
 207     return VLC_SUCCESS;
 208 }
 209
 210 /*****************************************************************************
 211  * End: terminate Distort video thread output method
 212  *****************************************************************************/
 213 static void End( vout_thread_t *p_vout )
 214 {
 215     int i_index;
 216
 217     /* Free the fake output buffers we allocated */
 218     for( i_index = I_OUTPUTPICTURES ; i_index ; )
 219     {
 220         i_index--;
 221         free( PP_OUTPUTPICTURE[ i_index ]->p_data_orig );
 222     }
 223 }
 224
 225 /*****************************************************************************
 226  * Destroy: destroy Distort video thread output method
 227  *****************************************************************************
 228  * Terminate an output method created by DistortCreateOutputMethod
 229  *****************************************************************************/
 230 static void Destroy( vlc_object_t *p_this )
 231 {
 232     vout_thread_t *p_vout = (vout_thread_t *)p_this;
 233
 234     DEL_CALLBACKS( p_vout->p_sys->p_vout, SendEvents );
 235     vlc_object_detach( p_vout->p_sys->p_vout );
 236     vout_Destroy( p_vout->p_sys->p_vout );
 237
 238     free( p_vout->p_sys );
 239 }
 240
 241 /*****************************************************************************
 242  * Render: displays previously rendered output
 243  *****************************************************************************
 244  * This function send the currently rendered image to Distort image, waits
 245  * until it is displayed and switch the two rendering buffers, preparing next
 246  * frame.
 247  *****************************************************************************/
 248 static void Render( vout_thread_t *p_vout, picture_t *p_pic )
 249 {
 250     picture_t *p_outpic;
 251
 252     /* This is a new frame. Get a structure from the video_output. */
 253     while( ( p_outpic = vout_CreatePicture( p_vout->p_sys->p_vout, 0, 0, 0 ) )
 254               == NULL )
 255     {
 256         if( p_vout->b_die || p_vout->b_error )
 257         {
 258             return;
 259         }
 260         msleep( VOUT_OUTMEM_SLEEP );
 261     }
 262
 263     vout_DatePicture( p_vout->p_sys->p_vout, p_outpic, p_pic->date );
 264
 265     switch( p_vout->p_sys->i_mode )
 266     {
 267         case DISTORT_MODE_WAVE:
 268             DistortWave( p_vout, p_pic, p_outpic );
 269             break;
 270
 271         case DISTORT_MODE_RIPPLE:
 272             DistortRipple( p_vout, p_pic, p_outpic );
 273             break;
 274
 275         default:
 276             break;
 277     }
 278
 279     vout_DisplayPicture( p_vout->p_sys->p_vout, p_outpic );
 280 }
 281
 282 /*****************************************************************************
 283  * DistortWave: draw a wave effect on the picture
 284  *****************************************************************************/
 285 static void DistortWave( vout_thread_t *p_vout, picture_t *p_inpic,
 286                                                 picture_t *p_outpic )
 287 {
 288     int i_index;
 289     double f_angle;
 290     mtime_t new_date = mdate();
 291
 292     p_vout->p_sys->f_angle += (new_date - p_vout->p_sys->last_date) / 200000.0;
 293     p_vout->p_sys->last_date = new_date;
 294     f_angle = p_vout->p_sys->f_angle;
 295
 296     for( i_index = 0 ; i_index < p_inpic->i_planes ; i_index++ )
 297     {
 298         int i_line, i_num_lines, i_offset;
 299         uint8_t black_pixel;
 300         uint8_t *p_in, *p_out;
 301
 302         p_in = p_inpic->p[i_index].p_pixels;
 303         p_out = p_outpic->p[i_index].p_pixels;
 304
 305         i_num_lines = p_inpic->p[i_index].i_lines;
 306
 307         black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
 308
 309         /* Ok, we do 3 times the sin() calculation for each line. So what ? */
 310         for( i_line = 0 ; i_line < i_num_lines ; i_line++ )
 311         {
 312             /* Calculate today's offset, don't go above 1/20th of the screen */
 313             i_offset = (int)( (double)(p_inpic->p[i_index].i_visible_pitch)
 314                          * sin( f_angle + 10.0 * (double)i_line
 315                                                / (double)i_num_lines )
 316                          / 20.0 );
 317
 318             if( i_offset )
 319             {
 320                 if( i_offset < 0 )
 321                 {
 322                     p_vout->p_vlc->pf_memcpy( p_out, p_in - i_offset,
 323                              p_inpic->p[i_index].i_visible_pitch + i_offset );
 324                     p_in += p_inpic->p[i_index].i_pitch;
 325                     p_out += p_outpic->p[i_index].i_pitch;
 326                     memset( p_out + i_offset, black_pixel, -i_offset );
 327                 }
 328                 else
 329                 {
 330                     p_vout->p_vlc->pf_memcpy( p_out + i_offset, p_in,
 331                              p_inpic->p[i_index].i_visible_pitch - i_offset );
 332                     memset( p_out, black_pixel, i_offset );
 333                     p_in += p_inpic->p[i_index].i_pitch;
 334                     p_out += p_outpic->p[i_index].i_pitch;
 335                 }
 336             }
 337             else
 338             {
 339                 p_vout->p_vlc->pf_memcpy( p_out, p_in,
 340                                           p_inpic->p[i_index].i_visible_pitch );
 341                 p_in += p_inpic->p[i_index].i_pitch;
 342                 p_out += p_outpic->p[i_index].i_pitch;
 343             }
 344
 345         }
 346     }
 347 }
 348
 349 /*****************************************************************************
 350  * DistortRipple: draw a ripple effect at the bottom of the picture
 351  *****************************************************************************/
 352 static void DistortRipple( vout_thread_t *p_vout, picture_t *p_inpic,
 353                                                   picture_t *p_outpic )
 354 {
 355     int i_index;
 356     double f_angle;
 357     mtime_t new_date = mdate();
 358
 359     p_vout->p_sys->f_angle -= (p_vout->p_sys->last_date - new_date) / 100000.0;
 360     p_vout->p_sys->last_date = new_date;
 361     f_angle = p_vout->p_sys->f_angle;
 362
 363     for( i_index = 0 ; i_index < p_inpic->i_planes ; i_index++ )
 364     {
 365         int i_line, i_first_line, i_num_lines, i_offset;
 366         uint8_t black_pixel;
 367         uint8_t *p_in, *p_out;
 368
 369         black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
 370
 371         i_num_lines = p_inpic->p[i_index].i_lines;
 372
 373         i_first_line = i_num_lines * 4 / 5;
 374
 375         p_in = p_inpic->p[i_index].p_pixels;
 376         p_out = p_outpic->p[i_index].p_pixels;
 377
 378         for( i_line = 0 ; i_line < i_first_line ; i_line++ )
 379         {
 380             p_vout->p_vlc->pf_memcpy( p_out, p_in,
 381                                       p_inpic->p[i_index].i_visible_pitch );
 382             p_in += p_inpic->p[i_index].i_pitch;
 383             p_out += p_outpic->p[i_index].i_pitch;
 384         }
 385
 386         /* Ok, we do 3 times the sin() calculation for each line. So what ? */
 387         for( i_line = i_first_line ; i_line < i_num_lines ; i_line++ )
 388         {
 389             /* Calculate today's offset, don't go above 1/20th of the screen */
 390             i_offset = (int)( (double)(p_inpic->p[i_index].i_pitch)
 391                          * sin( f_angle + 2.0 * (double)i_line
 392                                               / (double)( 1 + i_line
 393                                                             - i_first_line) )
 394                          * (double)(i_line - i_first_line)
 395                          / (double)i_num_lines
 396                          / 8.0 );
 397
 398             if( i_offset )
 399             {
 400                 if( i_offset < 0 )
 401                 {
 402                     p_vout->p_vlc->pf_memcpy( p_out, p_in - i_offset,
 403                              p_inpic->p[i_index].i_visible_pitch + i_offset );
 404                     p_in -= p_inpic->p[i_index].i_pitch;
 405                     p_out += p_outpic->p[i_index].i_pitch;
 406                     memset( p_out + i_offset, black_pixel, -i_offset );
 407                 }
 408                 else
 409                 {
 410                     p_vout->p_vlc->pf_memcpy( p_out + i_offset, p_in,
 411                              p_inpic->p[i_index].i_visible_pitch - i_offset );
 412                     memset( p_out, black_pixel, i_offset );
 413                     p_in -= p_inpic->p[i_index].i_pitch;
 414                     p_out += p_outpic->p[i_index].i_pitch;
 415                 }
 416             }
 417             else
 418             {
 419                 p_vout->p_vlc->pf_memcpy( p_out, p_in,
 420                                           p_inpic->p[i_index].i_visible_pitch );
 421                 p_in -= p_inpic->p[i_index].i_pitch;
 422                 p_out += p_outpic->p[i_index].i_pitch;
 423             }
 424
 425         }
 426     }
 427 }
 428
 429 /*****************************************************************************
 430  * SendEvents: forward mouse and keyboard events to the parent p_vout
 431  *****************************************************************************/
 432 static int SendEvents( vlc_object_t *p_this, char const *psz_var,
 433                        vlc_value_t oldval, vlc_value_t newval, void *p_data )
 434 {
 435     var_Set( (vlc_object_t *)p_data, psz_var, newval );
 436
 437     return VLC_SUCCESS;
 438 }
 439