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