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

   1 /*****************************************************************************
   2  * ball.c : Augmented reality ball video filter module
   3  *****************************************************************************
   4  * Copyright (C) 2000-2009 the VideoLAN team
   5  *
   6  * Author: Adrien Maglo <magsoft@videolan.org>
   7  *
   8  * The Canny edge detection algorithm comes from gradient.c which was
   9  * writen by:
  10  *         Samuel Hocevar <sam@zoy.org>
  11  *         Antoine Cellerier <dionoea -at- videolan -dot- org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  26  *****************************************************************************/
  27
  28
  29 /*****************************************************************************
  30  * Preamble
  31  *****************************************************************************/
  32
  33 #ifdef HAVE_CONFIG_H
  34 # include "config.h"
  35 #endif
  36
  37 #include <math.h> /* sin(), cos(), asin() */
  38
  39 #include <vlc_common.h>
  40 #include <vlc_plugin.h>
  41 #include <vlc_sout.h>
  42 #include <vlc_vout.h>
  43
  44 #include "vlc_filter.h"
  45 #include "filter_picture.h"
  46 #include "vlc_image.h"
  47
  48 enum { RED, GREEN, BLUE, WHITE };
  49
  50 typedef struct
  51 {
  52     uint8_t comp1;
  53     uint8_t comp2;
  54     uint8_t comp3;
  55 }COLOR;
  56
  57 static COLOR colorList[4];
  58
  59 #define COLORS_RGB \
  60     colorList[RED].comp1 = 255; colorList[RED].comp2 = 0;        \
  61                                 colorList[RED].comp3 = 0;        \
  62     colorList[GREEN].comp1 = 0; colorList[GREEN].comp2 = 255;    \
  63                                colorList[GREEN].comp3 = 0;       \
  64     colorList[BLUE].comp1 = 0; colorList[BLUE].comp2 = 0;        \
  65                                colorList[BLUE].comp3 = 255;      \
  66     colorList[WHITE].comp1 = 255; colorList[WHITE].comp2 = 255;  \
  67                                   colorList[WHITE].comp3 = 255;
  68
  69 #define COLORS_YUV \
  70     colorList[RED].comp1 = 82; colorList[RED].comp2 = 240;        \
  71                                 colorList[RED].comp3 = 90;        \
  72     colorList[GREEN].comp1 = 145; colorList[GREEN].comp2 = 34;    \
  73                                colorList[GREEN].comp3 = 54 ;      \
  74     colorList[BLUE].comp1 = 41; colorList[BLUE].comp2 = 146;      \
  75                                colorList[BLUE].comp3 = 240;       \
  76     colorList[WHITE].comp1 = 255; colorList[WHITE].comp2 = 128;   \
  77                                   colorList[WHITE].comp3 = 128;
  78
  79
  80 /*****************************************************************************
  81  * Local prototypes
  82  *****************************************************************************/
  83 static int  Create    ( vlc_object_t * );
  84 static void Destroy   ( vlc_object_t * );
  85
  86 static picture_t *Filter( filter_t *, picture_t * );
  87
  88 static void drawBall( filter_sys_t *p_sys, picture_t *p_outpic );
  89 static void drawPixelRGB24( filter_sys_t *p_sys, picture_t *p_outpic,
  90                             uint8_t R, uint8_t G, uint8_t B,
  91                             int x, int y, bool b_skip );
  92 static void drawPixelI420( filter_sys_t *p_sys, picture_t *p_outpic,
  93                            uint8_t Y, uint8_t U, uint8_t V,
  94                            int x, int y, bool b_skip );
  95 static void drawPixelPacked( filter_sys_t *p_sys, picture_t *p_outpic,
  96                              uint8_t Y, uint8_t U, uint8_t V,
  97                              int x, int y, bool b_skip );
  98
  99 static void FilterBall( filter_t *, picture_t *, picture_t * );
 100 static int ballCallback( vlc_object_t *, char const *,
 101                          vlc_value_t, vlc_value_t,
 102                          void * );
 103 static int getBallColor( vlc_object_t *p_this, char const *psz_newval );
 104
 105
 106 /*****************************************************************************
 107  * Module descriptor
 108  *****************************************************************************/
 109 #define BALL_COLOR_TEXT N_("Ball color")
 110 #define BALL_COLOR_LONGTEXT N_("Ball color, one of \"red\", \"blue\" and \"green\".")
 111
 112 #define EDGE_VISIBLE_TEXT N_("Edge visible")
 113 #define EDGE_VISIBLE_LONGTEXT N_("Set edge visibility.")
 114
 115 #define BALL_SPEED_TEXT N_("Ball speed")
 116 #define BALL_SPEED_LONGTEXT N_("Set ball speed, the displacement value \
 117                                 in number of pixels by frame.")
 118
 119 #define BALL_SIZE_TEXT N_("Ball size")
 120 #define BALL_SIZE_LONGTEXT N_("Set ball size giving its radius in number \
 121                                 of pixels")
 122
 123 #define GRAD_THRESH_TEXT N_("Gradient threshold")
 124 #define GRAD_THRESH_LONGTEXT N_("Set gradient threshold for edge computation.")
 125
 126 #define BALL_HELP N_("Augmented reality ball game")
 127
 128 #define FILTER_PREFIX "ball-"
 129
 130 static const char *const mode_list[] = { "red", "green", "blue", "white" };
 131 static const char *const mode_list_text[] = { N_("Red"), N_("Green"),
 132                                               N_("Blue"), N_("White") };
 133
 134 vlc_module_begin ()
 135     set_description( N_("Ball video filter") )
 136     set_shortname( N_( "Ball" ))
 137     set_help(BALL_HELP)
 138     set_capability( "video filter2", 0 )
 139     set_category( CAT_VIDEO )
 140     set_subcategory( SUBCAT_VIDEO_VFILTER )
 141
 142     add_string( FILTER_PREFIX "color", "ball-color", NULL,
 143                 BALL_COLOR_TEXT, BALL_COLOR_LONGTEXT, false )
 144     change_string_list( mode_list, mode_list_text, 0 )
 145
 146     add_integer_with_range( FILTER_PREFIX "speed", 4, 1, 15, NULL,
 147                             BALL_SPEED_TEXT, BALL_SPEED_LONGTEXT, false )
 148
 149     add_integer_with_range( FILTER_PREFIX "size", 10, 5, 30, NULL,
 150                             BALL_SIZE_TEXT, BALL_SIZE_LONGTEXT, false )
 151
 152     add_integer_with_range( FILTER_PREFIX "gradient-threshold", 40, 1, 200, NULL,
 153                             GRAD_THRESH_TEXT, GRAD_THRESH_LONGTEXT, false )
 154
 155     add_bool( FILTER_PREFIX "edge-visible", true, NULL,
 156               EDGE_VISIBLE_TEXT, EDGE_VISIBLE_LONGTEXT, true )
 157
 158     add_shortcut( "ball" )
 159     set_callbacks( Create, Destroy )
 160 vlc_module_end ()
 161
 162 static const char *const ppsz_filter_options[] = {
 163     "ball-color", "ball-speed", "ball-size",
 164     "gradient-threshold", "edge-visible", NULL
 165 };
 166
 167
 168 /*****************************************************************************
 169 * filter_sys_t: Distort video output method descriptor
 170 *****************************************************************************
 171 * This structure is part of the video output thread descriptor.
 172 * It describes the Distort specific properties of an output thread.
 173  *****************************************************************************/
 174 struct filter_sys_t
 175 {
 176     vlc_mutex_t lock;
 177
 178     int ballColor;
 179
 180     image_handler_t *p_image;
 181
 182     /* Ball position */
 183     int i_ball_x;
 184     int i_ball_y;
 185
 186     int i_ballSpeed;
 187
 188     int i_ballSize;
 189
 190     bool b_edgeVisible;
 191
 192     /* Offsets for YUV packed chroma */
 193     int i_y_offset;
 194     int i_u_offset;
 195     int i_v_offset;
 196
 197     /* Gradient values */
 198     uint32_t *p_smooth;
 199     int32_t *p_grad_x;
 200     int32_t *p_grad_y;
 201
 202     /* Gradient threshold */
 203     int i_gradThresh;
 204
 205     /* Motion vectors */
 206     float f_lastVect_x;
 207     float f_lastVect_y;
 208
 209     float f_newVect_x;
 210     float f_newVect_y;
 211
 212     float f_contVect_x;
 213     float f_contVect_y;
 214
 215     /* Pointer on drawing function */
 216     void ( *drawingPixelFunction )( filter_sys_t *, picture_t *,
 217                                     uint8_t, uint8_t, uint8_t,
 218                                     int, int, bool );
 219 };
 220
 221
 222 /*****************************************************************************
 223 * Create: allocates Distort video thread output method
 224 *****************************************************************************
 225 * This function allocates and initializes a Distort vout method.
 226 *****************************************************************************/
 227 static int Create( vlc_object_t *p_this )
 228 {
 229     filter_t *p_filter = (filter_t *)p_this;
 230     char *psz_method;
 231
 232     /* Allocate structure */
 233     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 234     if( p_filter->p_sys == NULL )
 235         return VLC_ENOMEM;
 236
 237     switch( p_filter->fmt_in.video.i_chroma )
 238     {
 239         case VLC_CODEC_I420:
 240         case VLC_CODEC_J420:
 241             p_filter->p_sys->drawingPixelFunction = drawPixelI420;
 242             COLORS_YUV
 243             break;
 244         CASE_PACKED_YUV_422
 245             p_filter->p_sys->drawingPixelFunction = drawPixelPacked;
 246             COLORS_YUV
 247             GetPackedYuvOffsets( p_filter->fmt_in.video.i_chroma,
 248                                  &p_filter->p_sys->i_y_offset,
 249                                  &p_filter->p_sys->i_u_offset,
 250                                  &p_filter->p_sys->i_v_offset );
 251             break;
 252         case VLC_CODEC_RGB24:
 253             p_filter->p_sys->drawingPixelFunction = drawPixelRGB24;
 254             COLORS_RGB
 255             break;
 256         default:
 257             msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
 258                      (char*)&(p_filter->fmt_in.video.i_chroma) );
 259             return VLC_EGENERIC;
 260     }
 261
 262     p_filter->p_sys->p_image = image_HandlerCreate( p_filter );
 263     if( p_filter->p_sys->p_image == NULL )
 264         return VLC_EGENERIC;
 265
 266     p_filter->pf_video_filter = Filter;
 267
 268     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 269                        p_filter->p_cfg );
 270
 271     if( !(psz_method =
 272         var_CreateGetNonEmptyStringCommand( p_filter,
 273                                             FILTER_PREFIX "color" ) ) )
 274     {
 275         msg_Err( p_filter, "configuration variable "
 276                  FILTER_PREFIX "color empty" );
 277         p_filter->p_sys->ballColor = RED;
 278     }
 279     else
 280         p_filter->p_sys->ballColor = getBallColor( p_this, psz_method );
 281
 282     free( psz_method );
 283
 284     p_filter->p_sys->i_ballSize =
 285             var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "size" );
 286     p_filter->p_sys->i_ballSpeed =
 287             var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "speed" );
 288     p_filter->p_sys->b_edgeVisible =
 289             var_CreateGetBoolCommand( p_filter, FILTER_PREFIX "edge-visible" );
 290     p_filter->p_sys->i_gradThresh =
 291             var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "gradient-threshold" );
 292
 293     vlc_mutex_init( &p_filter->p_sys->lock );
 294
 295     var_AddCallback( p_filter, FILTER_PREFIX "color",
 296                      ballCallback, p_filter->p_sys );
 297     var_AddCallback( p_filter, FILTER_PREFIX "size",
 298                      ballCallback, p_filter->p_sys );
 299     var_AddCallback( p_filter, FILTER_PREFIX "speed",
 300                      ballCallback, p_filter->p_sys );
 301     var_AddCallback( p_filter, FILTER_PREFIX "edge-visible",
 302                      ballCallback, p_filter->p_sys );
 303
 304     p_filter->p_sys->p_smooth = NULL;
 305     p_filter->p_sys->p_grad_x = NULL;
 306     p_filter->p_sys->p_grad_y = NULL;
 307
 308     p_filter->p_sys->i_ball_x = 100;
 309     p_filter->p_sys->i_ball_y = 100;
 310
 311     p_filter->p_sys->f_lastVect_x = 0;
 312     p_filter->p_sys->f_lastVect_y = -1;
 313
 314     return VLC_SUCCESS;
 315 }
 316
 317
 318 /*****************************************************************************
 319 * Destroy: destroy Distort video thread output method
 320 *****************************************************************************
 321 * Terminate an output method created by DistortCreateOutputMethod
 322  *****************************************************************************/
 323 static void Destroy( vlc_object_t *p_this )
 324 {
 325     filter_t *p_filter = (filter_t *)p_this;
 326     filter_sys_t *p_sys = p_filter->p_sys;
 327
 328     var_DelCallback( p_filter, FILTER_PREFIX "color",
 329                      ballCallback, p_sys );
 330     var_DelCallback( p_filter, FILTER_PREFIX "size",
 331                      ballCallback, p_sys );
 332     var_DelCallback( p_filter, FILTER_PREFIX "speed",
 333                      ballCallback, p_sys );
 334     var_DelCallback( p_filter, FILTER_PREFIX "edge-visible",
 335                      ballCallback, p_sys );
 336
 337     vlc_mutex_destroy( &p_sys->lock );
 338
 339     image_HandlerDelete( p_sys->p_image );
 340
 341     free( p_sys->p_smooth );
 342     free( p_sys->p_grad_x );
 343     free( p_sys->p_grad_y );
 344
 345     free( p_sys );
 346 }
 347
 348
 349 /*****************************************************************************
 350 * Render: displays previously rendered output
 351 *****************************************************************************
 352 * This function send the currently rendered image to Distort image, waits
 353 * until it is displayed and switch the two rendering buffers, preparing next
 354 * frame.
 355  *****************************************************************************/
 356 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 357 {
 358     picture_t *p_outpic;
 359
 360     if( !p_pic ) return NULL;
 361
 362     p_outpic = filter_NewPicture( p_filter );
 363     if( !p_outpic )
 364     {
 365         picture_Release( p_pic );
 366         return NULL;
 367     }
 368
 369     vlc_mutex_lock( &p_filter->p_sys->lock );
 370     FilterBall( p_filter, p_pic, p_outpic );
 371     vlc_mutex_unlock( &p_filter->p_sys->lock );
 372
 373     return CopyInfoAndRelease( p_outpic, p_pic );
 374 }
 375
 376
 377 /*****************************************************************************
 378 * Drawing functions
 379 *****************************************************************************/
 380
 381 static void drawBall( filter_sys_t *p_sys, picture_t *p_outpic )
 382 {
 383     int x = p_sys->i_ball_x;
 384     int y = p_sys->i_ball_y;
 385     int size = p_sys->i_ballSize;
 386
 387     const int i_width = p_outpic->p[0].i_visible_pitch;
 388     const int i_height = p_outpic->p[0].i_visible_lines;
 389
 390     for( int j = y - size; j <= y + size; j++ )
 391     {
 392         bool b_skip = ( x - size ) % 2;
 393         for( int i = x - size; i <= x + size; i++ )
 394         {
 395             /* Draw the pixel if it is inside the disk
 396                and check we don't write out the frame. */
 397             if( ( i - x ) * ( i - x ) + ( j - y ) * ( j - y ) <= size * size
 398                 && i >= 0 && i < i_width
 399                 && j >= 0 && j < i_height )
 400             {
 401                 ( *p_sys->drawingPixelFunction )( p_sys, p_outpic,
 402                                     colorList[ p_sys->ballColor ].comp1,
 403                                     colorList[ p_sys->ballColor ].comp2,
 404                                     colorList[ p_sys->ballColor ].comp3,
 405                                     i, j, b_skip );
 406             }
 407             b_skip = !b_skip;
 408         }
 409     }
 410 }
 411
 412
 413 static void drawPixelRGB24( filter_sys_t *p_sys, picture_t *p_outpic,
 414                             uint8_t R, uint8_t G, uint8_t B,
 415                             int x, int y, bool b_skip )
 416 {
 417     VLC_UNUSED( p_sys );
 418     VLC_UNUSED( b_skip );
 419     uint8_t *p_pixel = p_outpic->p[0].p_pixels
 420                        + p_outpic->p[0].i_pitch
 421                        * x + 3 * y;
 422     *p_pixel = B;
 423     *++p_pixel = G;
 424     *++p_pixel = R;
 425 }
 426
 427
 428 static void drawPixelI420( filter_sys_t *p_sys, picture_t *p_outpic,
 429                            uint8_t Y, uint8_t U, uint8_t V,
 430                            int x, int y, bool b_skip )
 431 {
 432     VLC_UNUSED( p_sys );
 433     *( p_outpic->p[0].p_pixels + p_outpic->p[0].i_pitch * y + x ) = Y;
 434     if( !b_skip )
 435     {
 436         *( p_outpic->p[2].p_pixels + p_outpic->p[2].i_pitch
 437                                      * ( y / 2 ) + x / 2 ) = U;
 438         *( p_outpic->p[1].p_pixels + p_outpic->p[1].i_pitch
 439                                      * ( y / 2 ) + x / 2 ) = V;
 440     }
 441 }
 442
 443
 444 static void drawPixelPacked( filter_sys_t *p_sys, picture_t *p_outpic,
 445                            uint8_t Y, uint8_t U, uint8_t V,
 446                            int x, int y, bool b_skip )
 447 {
 448     uint8_t *p_pixel = p_outpic->p[0].p_pixels
 449                        + p_outpic->p[0].i_pitch * y + x * 2;
 450     *( p_pixel + p_sys->i_y_offset ) = Y;
 451     if( !b_skip )
 452     {
 453         *( p_pixel + p_sys->i_u_offset ) = U;
 454         *( p_pixel + p_sys->i_v_offset ) = V;
 455     }
 456 }
 457
 458
 459 /*****************************************************************************
 460 * Nomalize vector
 461 *****************************************************************************
 462 * Modify its value to set its norm to 1 and keep its direction.
 463  *****************************************************************************/
 464 static void NormalizeVector( float *vect_x, float *vect_y )
 465 {
 466     float norm = sqrt( *vect_x * *vect_x + *vect_y * *vect_y );
 467     if( *vect_x != 0 || *vect_y != 0 )
 468     {
 469         *vect_x /= norm;
 470         *vect_y /= norm;
 471     }
 472 }
 473
 474
 475 /*****************************************************************************
 476 * Gaussian Convolution
 477 *****************************************************************************
 478 *    Gaussian convolution ( sigma == 1.4 )
 479 *
 480 *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 481 *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 482 *    |  5 12 15 12  5  | ~ |  4 12 16 12  4 |
 483 *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 484 *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 485  *****************************************************************************/
 486 static void GaussianConvolution( picture_t *p_inpic, uint32_t *p_smooth )
 487 {
 488     const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 489     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 490     const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
 491     const int i_numLines = p_inpic->p[Y_PLANE].i_visible_lines;
 492
 493     int x,y;
 494     for( y = 2; y < i_numLines - 2; y++ )
 495     {
 496         for( x = 2; x < i_src_visible - 2; x++ )
 497         {
 498             p_smooth[y*i_src_visible+x] = (uint32_t)(
 499                     /* 2 rows up */
 500                     ( p_inpix[(y-2)*i_src_pitch+x-2] )
 501                     + ((p_inpix[(y-2)*i_src_pitch+x-1]
 502                     +   p_inpix[(y-2)*i_src_pitch+x]
 503                     +   p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
 504                     + ( p_inpix[(y-2)*i_src_pitch+x+2] )
 505                     /* 1 row up */
 506                     + ((p_inpix[(y-1)*i_src_pitch+x-2]
 507                     + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
 508                     + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
 509                     + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
 510                     +   p_inpix[(y-1)*i_src_pitch+x+2]
 511                     /* */
 512                     +   p_inpix[y*i_src_pitch+x-2]
 513                     + ( p_inpix[y*i_src_pitch+x-1]*3 )
 514                     + ( p_inpix[y*i_src_pitch+x]<<2 )
 515                     + ( p_inpix[y*i_src_pitch+x+1]*3 )
 516                     +   p_inpix[y*i_src_pitch+x+2]
 517                     /* 1 row down */
 518                     +   p_inpix[(y+1)*i_src_pitch+x-2]
 519                     + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
 520                     + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
 521                     + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
 522                     +   p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
 523                     /* 2 rows down */
 524                     + ( p_inpix[(y+2)*i_src_pitch+x-2] )
 525                     + ((p_inpix[(y+2)*i_src_pitch+x-1]
 526                     +   p_inpix[(y+2)*i_src_pitch+x]
 527                     +   p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
 528                     + ( p_inpix[(y+2)*i_src_pitch+x+2] )
 529                                                     ) >> 6 /* 115 */;
 530         }
 531     }
 532 }
 533
 534
 535 /*****************************************************************************
 536  * FilterBall: Augmented reality ball video filter
 537  *****************************************************************************
 538  * The edge detection part comes from gradient.c video filter module.
 539  * The Canny edge detection algorithm is used :
 540  * http://fourier.eng.hmc.edu/e161/lectures/canny/node1.html
 541  * (well ... the implementation isn't really the canny algorithm ... but some
 542  * ideas are the same)
 543  *****************************************************************************/
 544 static void FilterBall( filter_t *p_filter, picture_t *p_inpic,
 545                            picture_t *p_outpic )
 546 {
 547     int x, y;
 548     filter_sys_t *p_sys = p_filter->p_sys;
 549
 550     uint32_t *p_smooth;
 551     int32_t *p_grad_x;
 552     int32_t *p_grad_y;
 553
 554     picture_t *p_converted;
 555     video_format_t fmt_comp;
 556
 557     switch( p_filter->fmt_in.video.i_chroma )
 558     {
 559         case VLC_CODEC_RGB24:
 560         CASE_PACKED_YUV_422
 561             fmt_comp.i_width = p_filter->fmt_in.video.i_width;
 562             fmt_comp.i_height = p_filter->fmt_in.video.i_height;
 563             fmt_comp.i_chroma = VLC_FOURCC('G','R','E','Y');
 564             fmt_comp.i_visible_width = fmt_comp.i_width;
 565             fmt_comp.i_visible_height = fmt_comp.i_height;
 566
 567             p_converted = image_Convert( p_filter->p_sys->p_image, p_inpic,
 568                                          &(p_filter->fmt_in.video),
 569                                          &fmt_comp );
 570             if( !p_converted )
 571                 return;
 572
 573             break;
 574
 575         default:
 576             p_converted = p_inpic;
 577             break;
 578     }
 579
 580     const int i_numCols = p_converted->p[0].i_visible_pitch;
 581     const int i_numLines = p_converted->p[0].i_visible_lines;
 582
 583     if( !p_filter->p_sys->p_smooth )
 584         p_filter->p_sys->p_smooth =
 585                 (uint32_t *)malloc( i_numLines * i_numCols
 586                                     * sizeof(uint32_t));
 587     p_smooth = p_filter->p_sys->p_smooth;
 588
 589     if( !p_filter->p_sys->p_grad_x )
 590         p_filter->p_sys->p_grad_x =
 591                 (int32_t *)malloc( i_numLines * i_numCols
 592                                    * sizeof(int32_t));
 593     p_grad_x = p_filter->p_sys->p_grad_x;
 594
 595     if( !p_filter->p_sys->p_grad_y )
 596         p_filter->p_sys->p_grad_y =
 597                 (int32_t *)malloc( i_numLines * i_numCols
 598                                    * sizeof(int32_t));
 599     p_grad_y = p_filter->p_sys->p_grad_y;
 600
 601     if( !p_smooth || !p_grad_x || !p_grad_y ) return;
 602
 603     vlc_memcpy( p_outpic->p[0].p_pixels, p_inpic->p[0].p_pixels,
 604                 p_outpic->p[0].i_lines * p_outpic->p[0].i_pitch );
 605     vlc_memcpy( p_outpic->p[1].p_pixels, p_inpic->p[1].p_pixels,
 606                 p_outpic->p[1].i_lines * p_outpic->p[1].i_pitch );
 607     vlc_memcpy( p_outpic->p[2].p_pixels, p_inpic->p[2].p_pixels,
 608                 p_outpic->p[2].i_lines * p_outpic->p[2].i_pitch );
 609
 610     GaussianConvolution( p_converted, p_smooth );
 611
 612     /* Compute the picture Sobel gradient
 613        | -1 0 1 |     |  1  2  1 |
 614        | -2 0 2 | and |  0  0  0 |
 615        | -1 0 1 |     | -1 -2 -1 | */
 616
 617     for( y = 1; y < i_numLines - 1; y++ )
 618     {
 619         for( x = 1; x < i_numCols - 1; x++ )
 620         {
 621
 622             p_grad_x[ y * i_numCols + x ] =
 623                     ( p_smooth[(y-1)*i_numCols+x-1]
 624                     - p_smooth[(y+1)*i_numCols+x-1] )
 625                     + ( ( p_smooth[(y-1)*i_numCols+x]
 626                     - p_smooth[(y+1)*i_numCols+x] ) <<1 )
 627                     + ( p_smooth[(y-1)*i_numCols+x+1]
 628                     - p_smooth[(y+1)*i_numCols+x+1] );
 629             p_grad_y[ y * i_numCols + x ] =
 630                     ( p_smooth[(y-1)*i_numCols+x-1]
 631                     - p_smooth[(y-1)*i_numCols+x+1] )
 632                     + ( ( p_smooth[y*i_numCols+x-1]
 633                     - p_smooth[y*i_numCols+x+1] ) <<1 )
 634                     + ( p_smooth[(y+1)*i_numCols+x-1]
 635                     - p_smooth[(y+1)*i_numCols+x+1] );
 636         }
 637     }
 638
 639     if( p_sys->b_edgeVisible )
 640     {
 641         /* Display the edges. */
 642         for( y = 1; y < i_numLines - 1; y++ )
 643         {
 644             for( x = 1; x < i_numCols - 1; x++ )
 645             {
 646                 if( abs( p_grad_x[ y * i_numCols + x ] )
 647                     + abs( p_grad_y[ y * i_numCols + x ] )
 648                     > p_sys->i_gradThresh )
 649                 {
 650                     ( *p_sys->drawingPixelFunction )( p_sys, p_outpic,
 651                                                       colorList[ WHITE ].comp1,
 652                                                       colorList[ WHITE ].comp2,
 653                                                       colorList[ WHITE ].comp3,
 654                                                       x, y, 0 );
 655                 }
 656             }
 657         }
 658     }
 659
 660     int i_motion;
 661
 662     float *pf_lastVect_x = &p_sys->f_lastVect_x;
 663     float *pf_lastVect_y = &p_sys->f_lastVect_y;
 664
 665     float f_newVect_x = 0;
 666     float f_newVect_y = 0;
 667     float f_contVect_x = 0;
 668     float f_contVect_y = 0;
 669
 670     int nb_collisions = 0;
 671
 672     bool bounce = false;
 673
 674     /* Test collisions for each pixel the ball will cover in its
 675        motion. */
 676     for ( i_motion = 0; i_motion <= p_sys->i_ballSpeed && !bounce; i_motion++ )
 677     {
 678         /* Compute next ball position */
 679         x = roundf( (float)p_sys->i_ball_x
 680                     + *pf_lastVect_x * (float)i_motion );
 681         y = roundf( (float)p_sys->i_ball_y
 682                     + *pf_lastVect_y * (float)i_motion );
 683
 684         for( int i = x - p_sys->i_ballSize; i <= x + p_sys->i_ballSize; i++ )
 685         {
 686             for( int j = y - p_sys->i_ballSize;
 687                  j <= y + p_sys->i_ballSize; j++ )
 688             {
 689                 /* Test the pixel if it is inside the disk and check we don't
 690                 write out the frame. */
 691                 if( ( i - x ) * ( i - x ) + ( j - y ) * ( j - y )
 692                     == p_sys->i_ballSize * p_sys->i_ballSize
 693                     && j <= i_numLines - 1 && x <= i_numCols - 1
 694                     && j >= 0 && i >= 0 )
 695                 {
 696                     /* Test firstly the picture limit collisions. */
 697                     if( i <= 2 )
 698                     {
 699                         f_contVect_x = x - i;
 700                         f_contVect_y = 0;
 701                         x++;
 702                         bounce = true;
 703                         nb_collisions = 1;
 704                         goto endLoop;
 705                     }
 706                     if( j <= 2 )
 707                     {
 708                         f_contVect_x = 0;
 709                         f_contVect_y = y - j;
 710                         y++;
 711                         bounce = true;
 712                         nb_collisions = 1;
 713                         goto endLoop;
 714                     }
 715                     if( j >= i_numLines - 3 )
 716                     {
 717                         f_contVect_x = 0;
 718                         f_contVect_y = y - j;
 719                         y--;
 720                         bounce = true;
 721                         nb_collisions = 1;
 722                         goto endLoop;
 723                     }
 724                     if( i >= i_numCols - 3 )
 725                     {
 726                         f_contVect_x = x - i;
 727                         f_contVect_y = 0;
 728                         x--;
 729                         bounce = true;
 730                         nb_collisions = 1;
 731                         goto endLoop;
 732                     }
 733                     /* Test the collisions with edges. */
 734                     if( abs( p_grad_x[ j * i_numCols + i ] )
 735                         + abs( p_grad_y[ j * i_numCols + i ] )
 736                         > p_sys->i_gradThresh )
 737                     {
 738                         f_contVect_x += x - i;
 739                         f_contVect_y += y - j;
 740                         nb_collisions++;
 741                         bounce = true;
 742                     }
 743                 }
 744             }
 745         }
 746     }
 747
 748     endLoop:
 749
 750     if( bounce )
 751     {
 752         /* Compute normal vector. */
 753         f_contVect_x /= nb_collisions;
 754         f_contVect_y /= nb_collisions;
 755         NormalizeVector( &f_contVect_x, &f_contVect_y );
 756
 757         /* Compute the new vector after the bounce. */
 758         float cosinus = *pf_lastVect_x * f_contVect_x
 759                         + *pf_lastVect_y * f_contVect_y;
 760         f_newVect_x = *pf_lastVect_x - 2 * cosinus * f_contVect_x;
 761         f_newVect_y = *pf_lastVect_y - 2 * cosinus * f_contVect_y;
 762         NormalizeVector( &f_newVect_x, &f_newVect_y );
 763
 764         *pf_lastVect_x = f_newVect_x;
 765         *pf_lastVect_y = f_newVect_y;
 766
 767         p_sys->i_ball_x = x;
 768         p_sys->i_ball_y = y;
 769
 770         /* Test if next pixel is outside the frame limits.
 771            If it is the case, then the ball is blocked until it can move. */
 772         x = roundf( (float)x + *pf_lastVect_x );
 773         y = roundf( (float)y + *pf_lastVect_y );
 774         if( x - p_sys->i_ballSize < 2
 775             || x + p_sys->i_ballSize > i_numCols - 3
 776             || y - p_sys->i_ballSize < 2
 777             || y + p_sys->i_ballSize > i_numLines - 3 )
 778         {
 779             *pf_lastVect_x = 0;
 780             *pf_lastVect_y = 0;
 781         }
 782         else
 783             /* After a bouce, the first ball motion is always one pixel. */
 784             i_motion = p_sys->i_ballSpeed - 1;
 785     }
 786     else
 787         i_motion = 0;
 788
 789     /* Compute next ball position. */
 790     p_sys->i_ball_x = roundf( (float)p_sys->i_ball_x + *pf_lastVect_x
 791                               * (float)( p_sys->i_ballSpeed - i_motion ) );
 792     p_sys->i_ball_y = roundf( p_sys->i_ball_y + *pf_lastVect_y
 793                               * (float)( p_sys->i_ballSpeed - i_motion ) );
 794
 795     /* Draw the ball */
 796     drawBall( p_sys, p_outpic );
 797
 798     switch( p_filter->fmt_in.video.i_chroma )
 799     {
 800         case VLC_CODEC_RGB24:
 801         CASE_PACKED_YUV_422
 802             picture_Release( p_converted );
 803         default:
 804             break;
 805     }
 806 }
 807
 808
 809 /*****************************************************************************
 810  * ballCallback
 811  *****************************************************************************
 812  * filter parameter modification callback
 813  *****************************************************************************/
 814 static int ballCallback( vlc_object_t *p_this, char const *psz_var,
 815                              vlc_value_t oldval, vlc_value_t newval,
 816                              void *p_data )
 817 {
 818     VLC_UNUSED(oldval);
 819     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 820     msg_Err( p_this, "Test" );
 821
 822     vlc_mutex_lock( &p_sys->lock );
 823     if( !strcmp( psz_var, FILTER_PREFIX "color" ) )
 824     {
 825         p_sys->ballColor = getBallColor( p_this, newval.psz_string );
 826     }
 827     else if( !strcmp( psz_var, FILTER_PREFIX "size" ) )
 828     {
 829         p_sys->i_ballSize = newval.i_int;
 830     }
 831     else if( !strcmp( psz_var, FILTER_PREFIX "speed" ) )
 832     {
 833         p_sys->i_ballSpeed = newval.i_int;
 834     }
 835     else if( !strcmp( psz_var, FILTER_PREFIX "edge-visible" ) )
 836     {
 837         p_sys->b_edgeVisible = newval.b_bool;
 838     }
 839     else if( !strcmp( psz_var, FILTER_PREFIX "gradient-threshold" ) )
 840     {
 841         p_sys->i_gradThresh = newval.i_int;
 842     }
 843     vlc_mutex_unlock( &p_sys->lock );
 844
 845     return VLC_SUCCESS;
 846 }
 847
 848
 849 /*****************************************************************************
 850  * getBallColor
 851  *****************************************************************************
 852  * Get and assign the ball color value
 853  *****************************************************************************/
 854 static int getBallColor( vlc_object_t *p_this, char const *psz_newval )
 855 {
 856     int ret;
 857     if( !strcmp( psz_newval, "red" ) )
 858         ret = RED;
 859     else if( !strcmp( psz_newval, "blue" ) )
 860         ret = BLUE;
 861     else if( !strcmp( psz_newval, "green" ) )
 862         ret = GREEN;
 863     else if( !strcmp( psz_newval, "white" ) )
 864         ret = WHITE;
 865     else
 866     {
 867         msg_Err( p_this, "no valid ball color provided (%s)", psz_newval );
 868         ret = RED;
 869     }
 870     return ret;
 871 }