git.sesse.net Git - vlc/blob - plugins/filter/distort.c

   1 /*****************************************************************************
   2  * distort.c : Misc video effects plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000, 2001 VideoLAN
   5  * $Id: distort.c,v 1.7 2002/02/15 13:32:53 sam 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 <errno.h>
  28 #include <stdlib.h>                                      /* malloc(), free() */
  29 #include <string.h>
  30
  31 #include <math.h>                                            /* sin(), cos() */
  32
  33 #include <videolan/vlc.h>
  34
  35 #include "video.h"
  36 #include "video_output.h"
  37
  38 #include "filter_common.h"
  39
  40 #define DISTORT_MODE_WAVE    1
  41 #define DISTORT_MODE_RIPPLE  2
  42
  43 /*****************************************************************************
  44  * Capabilities defined in the other files.
  45  *****************************************************************************/
  46 static void vout_getfunctions( function_list_t * p_function_list );
  47
  48 /*****************************************************************************
  49  * Build configuration tree.
  50  *****************************************************************************/
  51 MODULE_CONFIG_START
  52 MODULE_CONFIG_STOP
  53
  54 MODULE_INIT_START
  55     SET_DESCRIPTION( "miscellaneous video effects module" )
  56     /* Capability score set to 0 because we don't want to be spawned
  57      * as a video output unless explicitly requested to */
  58     ADD_CAPABILITY( VOUT, 0 )
  59     ADD_SHORTCUT( "distort" )
  60 MODULE_INIT_STOP
  61
  62 MODULE_ACTIVATE_START
  63     vout_getfunctions( &p_module->p_functions->vout );
  64 MODULE_ACTIVATE_STOP
  65
  66 MODULE_DEACTIVATE_START
  67 MODULE_DEACTIVATE_STOP
  68
  69 /*****************************************************************************
  70  * vout_sys_t: Distort video output method descriptor
  71  *****************************************************************************
  72  * This structure is part of the video output thread descriptor.
  73  * It describes the Distort specific properties of an output thread.
  74  *****************************************************************************/
  75 typedef struct vout_sys_s
  76 {
  77     int i_mode;
  78     struct vout_thread_s *p_vout;
  79
  80     /* For the wave mode */
  81     double  f_angle;
  82     mtime_t last_date;
  83
  84 } vout_sys_t;
  85
  86 /*****************************************************************************
  87  * Local prototypes
  88  *****************************************************************************/
  89 static int  vout_Create    ( struct vout_thread_s * );
  90 static int  vout_Init      ( struct vout_thread_s * );
  91 static void vout_End       ( struct vout_thread_s * );
  92 static void vout_Destroy   ( struct vout_thread_s * );
  93 static int  vout_Manage    ( struct vout_thread_s * );
  94 static void vout_Render    ( struct vout_thread_s *, struct picture_s * );
  95 static void vout_Display   ( struct vout_thread_s *, struct picture_s * );
  96
  97 static void DistortWave    ( struct vout_thread_s *, struct picture_s *,
  98                                                      struct picture_s * );
  99 static void DistortRipple  ( struct vout_thread_s *, struct picture_s *,
 100                                                      struct picture_s * );
 101
 102 /*****************************************************************************
 103  * Functions exported as capabilities. They are declared as static so that
 104  * we don't pollute the namespace too much.
 105  *****************************************************************************/
 106 static void vout_getfunctions( function_list_t * p_function_list )
 107 {
 108     p_function_list->functions.vout.pf_create     = vout_Create;
 109     p_function_list->functions.vout.pf_init       = vout_Init;
 110     p_function_list->functions.vout.pf_end        = vout_End;
 111     p_function_list->functions.vout.pf_destroy    = vout_Destroy;
 112     p_function_list->functions.vout.pf_manage     = vout_Manage;
 113     p_function_list->functions.vout.pf_render     = vout_Render;
 114     p_function_list->functions.vout.pf_display    = vout_Display;
 115 }
 116
 117 /*****************************************************************************
 118  * vout_Create: allocates Distort video thread output method
 119  *****************************************************************************
 120  * This function allocates and initializes a Distort vout method.
 121  *****************************************************************************/
 122 static int vout_Create( vout_thread_t *p_vout )
 123 {
 124     char *psz_method;
 125
 126     /* Allocate structure */
 127     p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
 128     if( p_vout->p_sys == NULL )
 129     {
 130         intf_ErrMsg("error: %s", strerror(ENOMEM) );
 131         return( 1 );
 132     }
 133
 134     /* Look what method was requested */
 135     psz_method = main_GetPszVariable( VOUT_FILTER_VAR, "" );
 136
 137     while( *psz_method && *psz_method != ':' )
 138     {
 139         psz_method++;
 140     }
 141
 142     if( !strcmp( psz_method, ":wave" ) )
 143     {
 144         p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
 145     }
 146     else if( !strcmp( psz_method, ":ripple" ) )
 147     {
 148         p_vout->p_sys->i_mode = DISTORT_MODE_RIPPLE;
 149     }
 150     else
 151     {
 152         intf_ErrMsg( "filter error: no valid distort mode provided, "
 153                      "using distort:wave" );
 154         p_vout->p_sys->i_mode = DISTORT_MODE_WAVE;
 155     }
 156
 157     return( 0 );
 158 }
 159
 160 /*****************************************************************************
 161  * vout_Init: initialize Distort video thread output method
 162  *****************************************************************************/
 163 static int vout_Init( vout_thread_t *p_vout )
 164 {
 165     int i_index;
 166     char *psz_filter;
 167     picture_t *p_pic;
 168
 169     I_OUTPUTPICTURES = 0;
 170
 171     /* Initialize the output structure */
 172     p_vout->output.i_chroma = p_vout->render.i_chroma;
 173     p_vout->output.i_width  = p_vout->render.i_width;
 174     p_vout->output.i_height = p_vout->render.i_height;
 175     p_vout->output.i_aspect = p_vout->render.i_aspect;
 176
 177     /* Try to open the real video output */
 178     psz_filter = main_GetPszVariable( VOUT_FILTER_VAR, "" );
 179     main_PutPszVariable( VOUT_FILTER_VAR, "" );
 180
 181     intf_WarnMsg( 1, "filter: spawning the real video output" );
 182
 183     p_vout->p_sys->p_vout =
 184         vout_CreateThread( NULL,
 185                            p_vout->render.i_width, p_vout->render.i_height,
 186                            p_vout->render.i_chroma, p_vout->render.i_aspect );
 187
 188     /* Everything failed */
 189     if( p_vout->p_sys->p_vout == NULL )
 190     {
 191         intf_ErrMsg( "filter error: can't open vout, aborting" );
 192
 193         return( 0 );
 194     }
 195
 196     main_PutPszVariable( VOUT_FILTER_VAR, psz_filter );
 197
 198     ALLOCATE_DIRECTBUFFERS( VOUT_MAX_PICTURES );
 199
 200     p_vout->p_sys->f_angle = 0.0;
 201     p_vout->p_sys->last_date = 0;
 202
 203     return( 0 );
 204 }
 205
 206 /*****************************************************************************
 207  * vout_End: terminate Distort video thread output method
 208  *****************************************************************************/
 209 static void vout_End( vout_thread_t *p_vout )
 210 {
 211     int i_index;
 212
 213     /* Free the fake output buffers we allocated */
 214     for( i_index = I_OUTPUTPICTURES ; i_index ; )
 215     {
 216         i_index--;
 217         free( PP_OUTPUTPICTURE[ i_index ]->p_data );
 218     }
 219 }
 220
 221 /*****************************************************************************
 222  * vout_Destroy: destroy Distort video thread output method
 223  *****************************************************************************
 224  * Terminate an output method created by DistortCreateOutputMethod
 225  *****************************************************************************/
 226 static void vout_Destroy( vout_thread_t *p_vout )
 227 {
 228     vout_DestroyThread( p_vout->p_sys->p_vout, NULL );
 229
 230     free( p_vout->p_sys );
 231 }
 232
 233 /*****************************************************************************
 234  * vout_Manage: handle Distort events
 235  *****************************************************************************
 236  * This function should be called regularly by video output thread. It manages
 237  * console events. It returns a non null value on error.
 238  *****************************************************************************/
 239 static int vout_Manage( vout_thread_t *p_vout )
 240 {
 241     return( 0 );
 242 }
 243
 244 /*****************************************************************************
 245  * vout_Render: displays previously rendered output
 246  *****************************************************************************
 247  * This function send the currently rendered image to Distort image, waits
 248  * until it is displayed and switch the two rendering buffers, preparing next
 249  * frame.
 250  *****************************************************************************/
 251 static void vout_Render( vout_thread_t *p_vout, picture_t *p_pic )
 252 {
 253     picture_t *p_outpic;
 254
 255     /* This is a new frame. Get a structure from the video_output. */
 256     while( ( p_outpic = vout_CreatePicture( p_vout->p_sys->p_vout, 0, 0, 0 ) )
 257               == NULL )
 258     {
 259         if( p_vout->b_die || p_vout->b_error )
 260         {
 261             return;
 262         }
 263         msleep( VOUT_OUTMEM_SLEEP );
 264     }
 265
 266     vout_DatePicture( p_vout->p_sys->p_vout, p_outpic, p_pic->date );
 267
 268     switch( p_vout->p_sys->i_mode )
 269     {
 270         case DISTORT_MODE_WAVE:
 271             DistortWave( p_vout, p_pic, p_outpic );
 272             break;
 273
 274         case DISTORT_MODE_RIPPLE:
 275             DistortRipple( p_vout, p_pic, p_outpic );
 276             break;
 277
 278         default:
 279             break;
 280     }
 281
 282     vout_DisplayPicture( p_vout->p_sys->p_vout, p_outpic );
 283 }
 284
 285 /*****************************************************************************
 286  * vout_Display: displays previously rendered output
 287  *****************************************************************************
 288  * This function send the currently rendered image to Invert image, waits
 289  * until it is displayed and switch the two rendering buffers, preparing next
 290  * frame.
 291  *****************************************************************************/
 292 static void vout_Display( vout_thread_t *p_vout, picture_t *p_pic )
 293 {
 294     ;
 295 }
 296
 297 /*****************************************************************************
 298  * DistortWave: draw a wave effect on the picture
 299  *****************************************************************************/
 300 static void DistortWave( vout_thread_t *p_vout, picture_t *p_inpic,
 301                                                 picture_t *p_outpic )
 302 {
 303     int i_index;
 304     double f_angle;
 305     mtime_t new_date = mdate();
 306
 307     p_vout->p_sys->f_angle += (new_date - p_vout->p_sys->last_date) / 200000.0;
 308     p_vout->p_sys->last_date = new_date;
 309     f_angle = p_vout->p_sys->f_angle;
 310
 311     for( i_index = 0 ; i_index < p_inpic->i_planes ; i_index++ )
 312     {
 313         int i_line, i_num_lines, i_offset;
 314         u8 black_pixel;
 315         u8 *p_in, *p_out;
 316
 317         p_in = p_inpic->p[i_index].p_pixels;
 318         p_out = p_outpic->p[i_index].p_pixels;
 319
 320         i_num_lines = p_inpic->p[i_index].i_lines;
 321
 322         black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
 323
 324         /* Ok, we do 3 times the sin() calculation for each line. So what ? */
 325         for( i_line = 0 ; i_line < i_num_lines ; i_line++ )
 326         {
 327             /* Calculate today's offset, don't go above 1/20th of the screen */
 328             i_offset = (double)(p_inpic->p[i_index].i_pitch)
 329                          * sin( f_angle + 10.0 * (double)i_line
 330                                                / (double)i_num_lines )
 331                          / 20.0;
 332
 333             if( i_offset )
 334             {
 335                 if( i_offset < 0 )
 336                 {
 337                     FAST_MEMCPY( p_out, p_in - i_offset,
 338                                  p_inpic->p[i_index].i_pitch + i_offset );
 339                     p_in += p_inpic->p[i_index].i_pitch;
 340                     p_out += p_outpic->p[i_index].i_pitch;
 341                     memset( p_out + i_offset, black_pixel, -i_offset );
 342                 }
 343                 else
 344                 {
 345                     FAST_MEMCPY( p_out + i_offset, p_in,
 346                                  p_inpic->p[i_index].i_pitch - i_offset );
 347                     memset( p_out, black_pixel, i_offset );
 348                     p_in += p_inpic->p[i_index].i_pitch;
 349                     p_out += p_outpic->p[i_index].i_pitch;
 350                 }
 351             }
 352             else
 353             {
 354                 FAST_MEMCPY( p_out, p_in, p_inpic->p[i_index].i_pitch );
 355                 p_in += p_inpic->p[i_index].i_pitch;
 356                 p_out += p_outpic->p[i_index].i_pitch;
 357             }
 358
 359         }
 360     }
 361 }
 362
 363 /*****************************************************************************
 364  * DistortRipple: draw a ripple effect at the bottom of the picture
 365  *****************************************************************************/
 366 static void DistortRipple( vout_thread_t *p_vout, picture_t *p_inpic,
 367                                                   picture_t *p_outpic )
 368 {
 369     int i_index;
 370     double f_angle;
 371     mtime_t new_date = mdate();
 372
 373     p_vout->p_sys->f_angle -= (p_vout->p_sys->last_date - new_date) / 100000.0;
 374     p_vout->p_sys->last_date = new_date;
 375     f_angle = p_vout->p_sys->f_angle;
 376
 377     for( i_index = 0 ; i_index < p_inpic->i_planes ; i_index++ )
 378     {
 379         int i_line, i_first_line, i_num_lines, i_offset;
 380         u8 black_pixel;
 381         u8 *p_in, *p_out;
 382
 383         black_pixel = ( i_index == Y_PLANE ) ? 0x00 : 0x80;
 384
 385         i_num_lines = p_inpic->p[i_index].i_lines;
 386
 387         i_first_line = i_num_lines * 4 / 5;
 388
 389         p_in = p_inpic->p[i_index].p_pixels;
 390         p_out = p_outpic->p[i_index].p_pixels;
 391
 392         FAST_MEMCPY( p_out, p_in, i_first_line * p_inpic->p[i_index].i_pitch );
 393
 394         p_in += i_first_line * p_inpic->p[i_index].i_pitch;
 395         p_out += i_first_line * p_outpic->p[i_index].i_pitch;
 396
 397         /* Ok, we do 3 times the sin() calculation for each line. So what ? */
 398         for( i_line = i_first_line ; i_line < i_num_lines ; i_line++ )
 399         {
 400             /* Calculate today's offset, don't go above 1/20th of the screen */
 401             i_offset = (double)(p_inpic->p[i_index].i_pitch)
 402                          * sin( f_angle + 2.0 * (double)i_line
 403                                               / (double)( 1 + i_line
 404                                                             - i_first_line) )
 405                          * (double)(i_line - i_first_line)
 406                          / (double)i_num_lines
 407                          / 8.0;
 408
 409             if( i_offset )
 410             {
 411                 if( i_offset < 0 )
 412                 {
 413                     FAST_MEMCPY( p_out, p_in - i_offset,
 414                                  p_inpic->p[i_index].i_pitch + i_offset );
 415                     p_in -= p_inpic->p[i_index].i_pitch;
 416                     p_out += p_outpic->p[i_index].i_pitch;
 417                     memset( p_out + i_offset, black_pixel, -i_offset );
 418                 }
 419                 else
 420                 {
 421                     FAST_MEMCPY( p_out + i_offset, p_in,
 422                                  p_inpic->p[i_index].i_pitch - i_offset );
 423                     memset( p_out, black_pixel, i_offset );
 424                     p_in -= p_inpic->p[i_index].i_pitch;
 425                     p_out += p_outpic->p[i_index].i_pitch;
 426                 }
 427             }
 428             else
 429             {
 430                 FAST_MEMCPY( p_out, p_in, p_inpic->p[i_index].i_pitch );
 431                 p_in -= p_inpic->p[i_index].i_pitch;
 432                 p_out += p_outpic->p[i_index].i_pitch;
 433             }
 434
 435         }
 436     }
 437 }
 438