modules/video_filter/ball.c

   1 /*****************************************************************************
   2  * ball.c : Augmented reality ball video filter module
   3  *****************************************************************************
   4  * Copyright (C) 2000-2009 VLC authors and VideoLAN
   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 it
  14  * under the terms of the GNU Lesser General Public License as published by
  15  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU Lesser General Public License
  24  * along with this program; if not, write to the Free Software Foundation,
  25  * 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_picture.h>
  42 #include <vlc_filter.h>
  43 #include "filter_picture.h"
  44 #include <vlc_image.h>
  45
  46 enum { RED, GREEN, BLUE, WHITE };
  47
  48 #define COLORS_RGB \
  49     p_filter->p_sys->colorList[RED].comp1 = 255; p_filter->p_sys->colorList[RED].comp2 = 0;        \
  50                                 p_filter->p_sys->colorList[RED].comp3 = 0;        \
  51     p_filter->p_sys->colorList[GREEN].comp1 = 0; p_filter->p_sys->colorList[GREEN].comp2 = 255;    \
  52                                p_filter->p_sys->colorList[GREEN].comp3 = 0;       \
  53     p_filter->p_sys->colorList[BLUE].comp1 = 0; p_filter->p_sys->colorList[BLUE].comp2 = 0;        \
  54                                p_filter->p_sys->colorList[BLUE].comp3 = 255;      \
  55     p_filter->p_sys->colorList[WHITE].comp1 = 255; p_filter->p_sys->colorList[WHITE].comp2 = 255;  \
  56                                   p_filter->p_sys->colorList[WHITE].comp3 = 255;
  57
  58 #define COLORS_YUV \
  59     p_filter->p_sys->colorList[RED].comp1 = 82; p_filter->p_sys->colorList[RED].comp2 = 240;        \
  60                                 p_filter->p_sys->colorList[RED].comp3 = 90;        \
  61     p_filter->p_sys->colorList[GREEN].comp1 = 145; p_filter->p_sys->colorList[GREEN].comp2 = 34;    \
  62                                p_filter->p_sys->colorList[GREEN].comp3 = 54 ;      \
  63     p_filter->p_sys->colorList[BLUE].comp1 = 41; p_filter->p_sys->colorList[BLUE].comp2 = 146;      \
  64                                p_filter->p_sys->colorList[BLUE].comp3 = 240;       \
  65     p_filter->p_sys->colorList[WHITE].comp1 = 255; p_filter->p_sys->colorList[WHITE].comp2 = 128;   \
  66                                   p_filter->p_sys->colorList[WHITE].comp3 = 128;
  67
  68
  69 /*****************************************************************************
  70  * Local prototypes
  71  *****************************************************************************/
  72 static int  Create    ( vlc_object_t * );
  73 static void Destroy   ( vlc_object_t * );
  74
  75 static picture_t *Filter( filter_t *, picture_t * );
  76
  77 static void drawBall( filter_sys_t *p_sys, picture_t *p_outpic );
  78 static void drawPixelRGB24( filter_sys_t *p_sys, picture_t *p_outpic,
  79                             uint8_t R, uint8_t G, uint8_t B,
  80                             int x, int y, bool b_skip );
  81 static void drawPixelI420( filter_sys_t *p_sys, picture_t *p_outpic,
  82                            uint8_t Y, uint8_t U, uint8_t V,
  83                            int x, int y, bool b_skip );
  84 static void drawPixelPacked( filter_sys_t *p_sys, picture_t *p_outpic,
  85                              uint8_t Y, uint8_t U, uint8_t V,
  86                              int x, int y, bool b_skip );
  87
  88 static void FilterBall( filter_t *, picture_t *, picture_t * );
  89 static int ballCallback( vlc_object_t *, char const *,
  90                          vlc_value_t, vlc_value_t,
  91                          void * );
  92 static int getBallColor( vlc_object_t *p_this, char const *psz_newval );
  93
  94
  95 /*****************************************************************************
  96  * Module descriptor
  97  *****************************************************************************/
  98 #define BALL_COLOR_TEXT N_("Ball color")
  99
 100 #define EDGE_VISIBLE_TEXT N_("Edge visible")
 101 #define EDGE_VISIBLE_LONGTEXT N_("Set edge visibility.")
 102
 103 #define BALL_SPEED_TEXT N_("Ball speed")
 104 #define BALL_SPEED_LONGTEXT N_("Set ball speed, the displacement value \
 105                                 in number of pixels by frame.")
 106
 107 #define BALL_SIZE_TEXT N_("Ball size")
 108 #define BALL_SIZE_LONGTEXT N_("Set ball size giving its radius in number \
 109                                 of pixels")
 110
 111 #define GRAD_THRESH_TEXT N_("Gradient threshold")
 112 #define GRAD_THRESH_LONGTEXT N_("Set gradient threshold for edge computation.")
 113
 114 #define BALL_HELP N_("Augmented reality ball game")
 115
 116 #define FILTER_PREFIX "ball-"
 117
 118 static const char *const mode_list[] = { "red", "green", "blue", "white" };
 119 static const char *const mode_list_text[] = { N_("Red"), N_("Green"),
 120                                               N_("Blue"), N_("White") };
 121
 122 vlc_module_begin ()
 123     set_description( N_("Ball video filter") )
 124     set_shortname( N_( "Ball" ))
 125     set_help(BALL_HELP)
 126     set_capability( "video filter", 0 )
 127     set_category( CAT_VIDEO )
 128     set_subcategory( SUBCAT_VIDEO_VFILTER )
 129
 130     add_string( FILTER_PREFIX "color", "red",
 131                 BALL_COLOR_TEXT, BALL_COLOR_TEXT, false )
 132     change_string_list( mode_list, mode_list_text )
 133
 134     add_integer_with_range( FILTER_PREFIX "speed", 4, 1, 15,
 135                             BALL_SPEED_TEXT, BALL_SPEED_LONGTEXT, false )
 136
 137     add_integer_with_range( FILTER_PREFIX "size", 10, 5, 30,
 138                             BALL_SIZE_TEXT, BALL_SIZE_LONGTEXT, false )
 139
 140     add_integer_with_range( FILTER_PREFIX "gradient-threshold", 40, 1, 200,
 141                             GRAD_THRESH_TEXT, GRAD_THRESH_LONGTEXT, false )
 142
 143     add_bool( FILTER_PREFIX "edge-visible", true,
 144               EDGE_VISIBLE_TEXT, EDGE_VISIBLE_LONGTEXT, true )
 145
 146     add_shortcut( "ball" )
 147     set_callbacks( Create, Destroy )
 148 vlc_module_end ()
 149
 150 static const char *const ppsz_filter_options[] = {
 151     "color", "speed", "size",
 152     "gradient-threshold", "edge-visible", NULL
 153 };
 154
 155
 156 /*****************************************************************************
 157 * filter_sys_t: Distort video output method descriptor
 158 *****************************************************************************
 159 * This structure is part of the video output thread descriptor.
 160 * It describes the Distort specific properties of an output thread.
 161  *****************************************************************************/
 162 struct filter_sys_t
 163 {
 164     vlc_mutex_t lock;
 165
 166     int ballColor;
 167
 168     image_handler_t *p_image;
 169
 170     /* Ball position */
 171     int i_ball_x;
 172     int i_ball_y;
 173
 174     int i_ballSpeed;
 175
 176     int i_ballSize;
 177
 178     bool b_edgeVisible;
 179
 180     /* Offsets for YUV packed chroma */
 181     int i_y_offset;
 182     int i_u_offset;
 183     int i_v_offset;
 184
 185     /* Gradient values */
 186     uint32_t *p_smooth;
 187     int32_t *p_grad_x;
 188     int32_t *p_grad_y;
 189
 190     /* Gradient threshold */
 191     int i_gradThresh;
 192
 193     /* Motion vectors */
 194     float f_lastVect_x;
 195     float f_lastVect_y;
 196
 197     float f_newVect_x;
 198     float f_newVect_y;
 199
 200     float f_contVect_x;
 201     float f_contVect_y;
 202
 203     /* Pointer on drawing function */
 204     void ( *drawingPixelFunction )( filter_sys_t *, picture_t *,
 205                                     uint8_t, uint8_t, uint8_t,
 206                                     int, int, bool );
 207     struct
 208     {
 209         uint8_t comp1;
 210         uint8_t comp2;
 211         uint8_t comp3;
 212     } colorList[4];
 213 };
 214
 215
 216 /*****************************************************************************
 217 * Create: allocates Distort video thread output method
 218 *****************************************************************************
 219 * This function allocates and initializes a Distort vout method.
 220 *****************************************************************************/
 221 static int Create( vlc_object_t *p_this )
 222 {
 223     filter_t *p_filter = (filter_t *)p_this;
 224     char *psz_method;
 225
 226     /* Allocate structure */
 227     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 228     if( p_filter->p_sys == NULL )
 229         return VLC_ENOMEM;
 230
 231     switch( p_filter->fmt_in.video.i_chroma )
 232     {
 233         case VLC_CODEC_I420:
 234         case VLC_CODEC_J420:
 235             p_filter->p_sys->drawingPixelFunction = drawPixelI420;
 236             COLORS_YUV
 237             break;
 238         CASE_PACKED_YUV_422
 239             p_filter->p_sys->drawingPixelFunction = drawPixelPacked;
 240             COLORS_YUV
 241             GetPackedYuvOffsets( p_filter->fmt_in.video.i_chroma,
 242                                  &p_filter->p_sys->i_y_offset,
 243                                  &p_filter->p_sys->i_u_offset,
 244                                  &p_filter->p_sys->i_v_offset );
 245             break;
 246         case VLC_CODEC_RGB24:
 247             p_filter->p_sys->drawingPixelFunction = drawPixelRGB24;
 248             COLORS_RGB
 249             break;
 250         default:
 251             msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
 252                      (char*)&(p_filter->fmt_in.video.i_chroma) );
 253             return VLC_EGENERIC;
 254     }
 255
 256     p_filter->p_sys->p_image = image_HandlerCreate( p_filter );
 257     if( p_filter->p_sys->p_image == NULL )
 258         return VLC_EGENERIC;
 259
 260     p_filter->pf_video_filter = Filter;
 261
 262     config_ChainParse( p_filter, FILTER_PREFIX, ppsz_filter_options,
 263                        p_filter->p_cfg );
 264
 265     if( !(psz_method =
 266         var_CreateGetNonEmptyStringCommand( p_filter,
 267                                             FILTER_PREFIX "color" ) ) )
 268     {
 269         msg_Err( p_filter, "configuration variable "
 270                  FILTER_PREFIX "color empty" );
 271         p_filter->p_sys->ballColor = RED;
 272     }
 273     else
 274         p_filter->p_sys->ballColor = getBallColor( p_this, psz_method );
 275
 276     free( psz_method );
 277
 278     p_filter->p_sys->i_ballSize =
 279             var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "size" );
 280     p_filter->p_sys->i_ballSpeed =
 281             var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "speed" );
 282     p_filter->p_sys->b_edgeVisible =
 283             var_CreateGetBoolCommand( p_filter, FILTER_PREFIX "edge-visible" );
 284     p_filter->p_sys->i_gradThresh =
 285             var_CreateGetIntegerCommand( p_filter, FILTER_PREFIX "gradient-threshold" );
 286
 287     vlc_mutex_init( &p_filter->p_sys->lock );
 288
 289     var_AddCallback( p_filter, FILTER_PREFIX "color",
 290                      ballCallback, p_filter->p_sys );
 291     var_AddCallback( p_filter, FILTER_PREFIX "size",
 292                      ballCallback, p_filter->p_sys );
 293     var_AddCallback( p_filter, FILTER_PREFIX "speed",
 294                      ballCallback, p_filter->p_sys );
 295     var_AddCallback( p_filter, FILTER_PREFIX "edge-visible",
 296                      ballCallback, p_filter->p_sys );
 297
 298     p_filter->p_sys->p_smooth = NULL;
 299     p_filter->p_sys->p_grad_x = NULL;
 300     p_filter->p_sys->p_grad_y = NULL;
 301
 302     p_filter->p_sys->i_ball_x = 100;
 303     p_filter->p_sys->i_ball_y = 100;
 304
 305     p_filter->p_sys->f_lastVect_x = 0;
 306     p_filter->p_sys->f_lastVect_y = -1;
 307
 308     return VLC_SUCCESS;
 309 }
 310
 311
 312 /*****************************************************************************
 313 * Destroy: destroy Distort video thread output method
 314 *****************************************************************************
 315 * Terminate an output method created by DistortCreateOutputMethod
 316  *****************************************************************************/
 317 static void Destroy( vlc_object_t *p_this )
 318 {
 319     filter_t *p_filter = (filter_t *)p_this;
 320     filter_sys_t *p_sys = p_filter->p_sys;
 321
 322     var_DelCallback( p_filter, FILTER_PREFIX "color",
 323                      ballCallback, p_sys );
 324     var_DelCallback( p_filter, FILTER_PREFIX "size",
 325                      ballCallback, p_sys );
 326     var_DelCallback( p_filter, FILTER_PREFIX "speed",
 327                      ballCallback, p_sys );
 328     var_DelCallback( p_filter, FILTER_PREFIX "edge-visible",
 329                      ballCallback, p_sys );
 330
 331     vlc_mutex_destroy( &p_sys->lock );
 332
 333     image_HandlerDelete( p_sys->p_image );
 334
 335     free( p_sys->p_smooth );
 336     free( p_sys->p_grad_x );
 337     free( p_sys->p_grad_y );
 338
 339     free( p_sys );
 340 }
 341
 342
 343 /*****************************************************************************
 344 * Render: displays previously rendered output
 345 *****************************************************************************
 346 * This function send the currently rendered image to Distort image, waits
 347 * until it is displayed and switch the two rendering buffers, preparing next
 348 * frame.
 349  *****************************************************************************/
 350 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 351 {
 352     picture_t *p_outpic;
 353
 354     if( !p_pic ) return NULL;
 355
 356     p_outpic = filter_NewPicture( p_filter );
 357     if( !p_outpic )
 358     {
 359         picture_Release( p_pic );
 360         return NULL;
 361     }
 362
 363     vlc_mutex_lock( &p_filter->p_sys->lock );
 364     FilterBall( p_filter, p_pic, p_outpic );
 365     vlc_mutex_unlock( &p_filter->p_sys->lock );
 366
 367     return CopyInfoAndRelease( p_outpic, p_pic );
 368 }
 369
 370
 371 /*****************************************************************************
 372 * Drawing functions
 373 *****************************************************************************/
 374
 375 static void drawBall( filter_sys_t *p_sys, picture_t *p_outpic )
 376 {
 377     int x = p_sys->i_ball_x;
 378     int y = p_sys->i_ball_y;
 379     int size = p_sys->i_ballSize;
 380
 381     const int i_width = p_outpic->p[0].i_visible_pitch;
 382     const int i_height = p_outpic->p[0].i_visible_lines;
 383
 384     for( int j = y - size; j <= y + size; j++ )
 385     {
 386         bool b_skip = ( x - size ) % 2;
 387         for( int i = x - size; i <= x + size; i++ )
 388         {
 389             /* Draw the pixel if it is inside the disk
 390                and check we don't write out the frame. */
 391             if( ( i - x ) * ( i - x ) + ( j - y ) * ( j - y ) <= size * size
 392                 && i >= 0 && i < i_width
 393                 && j >= 0 && j < i_height )
 394             {
 395                 ( *p_sys->drawingPixelFunction )( p_sys, p_outpic,
 396                                     p_sys->colorList[ p_sys->ballColor ].comp1,
 397                                     p_sys->colorList[ p_sys->ballColor ].comp2,
 398                                     p_sys->colorList[ p_sys->ballColor ].comp3,
 399                                     i, j, b_skip );
 400             }
 401             b_skip = !b_skip;
 402         }
 403     }
 404 }
 405
 406
 407 static void drawPixelRGB24( filter_sys_t *p_sys, picture_t *p_outpic,
 408                             uint8_t R, uint8_t G, uint8_t B,
 409                             int x, int y, bool b_skip )
 410 {
 411     VLC_UNUSED( p_sys );
 412     VLC_UNUSED( b_skip );
 413     uint8_t *p_pixel = p_outpic->p[0].p_pixels
 414                        + p_outpic->p[0].i_pitch
 415                        * x + 3 * y;
 416     *p_pixel = B;
 417     *++p_pixel = G;
 418     *++p_pixel = R;
 419 }
 420
 421
 422 static void drawPixelI420( filter_sys_t *p_sys, picture_t *p_outpic,
 423                            uint8_t Y, uint8_t U, uint8_t V,
 424                            int x, int y, bool b_skip )
 425 {
 426     VLC_UNUSED( p_sys );
 427     *( p_outpic->p[0].p_pixels + p_outpic->p[0].i_pitch * y + x ) = Y;
 428     if( !b_skip )
 429     {
 430         *( p_outpic->p[2].p_pixels + p_outpic->p[2].i_pitch
 431                                      * ( y / 2 ) + x / 2 ) = U;
 432         *( p_outpic->p[1].p_pixels + p_outpic->p[1].i_pitch
 433                                      * ( y / 2 ) + x / 2 ) = V;
 434     }
 435 }
 436
 437
 438 static void drawPixelPacked( filter_sys_t *p_sys, picture_t *p_outpic,
 439                            uint8_t Y, uint8_t U, uint8_t V,
 440                            int x, int y, bool b_skip )
 441 {
 442     uint8_t *p_pixel = p_outpic->p[0].p_pixels
 443                        + p_outpic->p[0].i_pitch * y + x * 2;
 444     *( p_pixel + p_sys->i_y_offset ) = Y;
 445     if( !b_skip )
 446     {
 447         *( p_pixel + p_sys->i_u_offset ) = U;
 448         *( p_pixel + p_sys->i_v_offset ) = V;
 449     }
 450 }
 451
 452
 453 /*****************************************************************************
 454 * Nomalize vector
 455 *****************************************************************************
 456 * Modify its value to set its norm to 1 and keep its direction.
 457  *****************************************************************************/
 458 static void NormalizeVector( float *vect_x, float *vect_y )
 459 {
 460     float norm = sqrt( *vect_x * *vect_x + *vect_y * *vect_y );
 461     if( *vect_x != 0 || *vect_y != 0 )
 462     {
 463         *vect_x /= norm;
 464         *vect_y /= norm;
 465     }
 466 }
 467
 468
 469 /*****************************************************************************
 470 * Gaussian Convolution
 471 *****************************************************************************
 472 *    Gaussian convolution ( sigma == 1.4 )
 473 *
 474 *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 475 *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 476 *    |  5 12 15 12  5  | ~ |  4 12 16 12  4 |
 477 *    |  4  9 12  9  4  |   |  4  8 12  8  4 |
 478 *    |  2  4  5  4  2  |   |  2  4  4  4  2 |
 479  *****************************************************************************/
 480 static void GaussianConvolution( picture_t *p_inpic, uint32_t *p_smooth )
 481 {
 482     const uint8_t *p_inpix = p_inpic->p[Y_PLANE].p_pixels;
 483     const int i_src_pitch = p_inpic->p[Y_PLANE].i_pitch;
 484     const int i_src_visible = p_inpic->p[Y_PLANE].i_visible_pitch;
 485     const int i_numLines = p_inpic->p[Y_PLANE].i_visible_lines;
 486
 487     for( int y = 2; y < i_numLines - 2; y++ )
 488     {
 489         for( int x = 2; x < i_src_visible - 2; x++ )
 490         {
 491             p_smooth[y*i_src_visible+x] = (uint32_t)(
 492                     /* 2 rows up */
 493                     ( p_inpix[(y-2)*i_src_pitch+x-2] )
 494                     + ((p_inpix[(y-2)*i_src_pitch+x-1]
 495                     +   p_inpix[(y-2)*i_src_pitch+x]
 496                     +   p_inpix[(y-2)*i_src_pitch+x+1])<<1 )
 497                     + ( p_inpix[(y-2)*i_src_pitch+x+2] )
 498                     /* 1 row up */
 499                     + ((p_inpix[(y-1)*i_src_pitch+x-2]
 500                     + ( p_inpix[(y-1)*i_src_pitch+x-1]<<1 )
 501                     + ( p_inpix[(y-1)*i_src_pitch+x]*3 )
 502                     + ( p_inpix[(y-1)*i_src_pitch+x+1]<<1 )
 503                     +   p_inpix[(y-1)*i_src_pitch+x+2]
 504                     /* */
 505                     +   p_inpix[y*i_src_pitch+x-2]
 506                     + ( p_inpix[y*i_src_pitch+x-1]*3 )
 507                     + ( p_inpix[y*i_src_pitch+x]<<2 )
 508                     + ( p_inpix[y*i_src_pitch+x+1]*3 )
 509                     +   p_inpix[y*i_src_pitch+x+2]
 510                     /* 1 row down */
 511                     +   p_inpix[(y+1)*i_src_pitch+x-2]
 512                     + ( p_inpix[(y+1)*i_src_pitch+x-1]<<1 )
 513                     + ( p_inpix[(y+1)*i_src_pitch+x]*3 )
 514                     + ( p_inpix[(y+1)*i_src_pitch+x+1]<<1 )
 515                     +   p_inpix[(y+1)*i_src_pitch+x+2] )<<1 )
 516                     /* 2 rows down */
 517                     + ( p_inpix[(y+2)*i_src_pitch+x-2] )
 518                     + ((p_inpix[(y+2)*i_src_pitch+x-1]
 519                     +   p_inpix[(y+2)*i_src_pitch+x]
 520                     +   p_inpix[(y+2)*i_src_pitch+x+1])<<1 )
 521                     + ( p_inpix[(y+2)*i_src_pitch+x+2] )
 522                                                     ) >> 6 /* 115 */;
 523         }
 524     }
 525 }
 526
 527
 528 /*****************************************************************************
 529  * FilterBall: Augmented reality ball video filter
 530  *****************************************************************************
 531  * The edge detection part comes from gradient.c video filter module.
 532  * The Canny edge detection algorithm is used :
 533  * http://fourier.eng.hmc.edu/e161/lectures/canny/node1.html
 534  * (well ... the implementation isn't really the canny algorithm ... but some
 535  * ideas are the same)
 536  *****************************************************************************/
 537 static void FilterBall( filter_t *p_filter, picture_t *p_inpic,
 538                            picture_t *p_outpic )
 539 {
 540     int x, y;
 541     filter_sys_t *p_sys = p_filter->p_sys;
 542
 543     uint32_t *p_smooth;
 544     int32_t *p_grad_x;
 545     int32_t *p_grad_y;
 546
 547     picture_t *p_converted;
 548     video_format_t fmt_comp;
 549     memset( &fmt_comp, 0, sizeof(fmt_comp) );
 550
 551     switch( p_filter->fmt_in.video.i_chroma )
 552     {
 553         case VLC_CODEC_RGB24:
 554         CASE_PACKED_YUV_422
 555             fmt_comp.i_width = p_filter->fmt_in.video.i_width;
 556             fmt_comp.i_height = p_filter->fmt_in.video.i_height;
 557             fmt_comp.i_chroma = VLC_FOURCC('G','R','E','Y');
 558             fmt_comp.i_visible_width = fmt_comp.i_width;
 559             fmt_comp.i_visible_height = fmt_comp.i_height;
 560
 561             p_converted = image_Convert( p_filter->p_sys->p_image, p_inpic,
 562                                          &(p_filter->fmt_in.video),
 563                                          &fmt_comp );
 564             if( !p_converted )
 565                 return;
 566
 567             break;
 568
 569         default:
 570             p_converted = p_inpic;
 571             break;
 572     }
 573
 574     const int i_numCols = p_converted->p[0].i_visible_pitch;
 575     const int i_numLines = p_converted->p[0].i_visible_lines;
 576
 577     if( !p_filter->p_sys->p_smooth )
 578         p_filter->p_sys->p_smooth =
 579                 (uint32_t *)vlc_alloc( i_numLines * i_numCols,
 580                                        sizeof(uint32_t));
 581     p_smooth = p_filter->p_sys->p_smooth;
 582
 583     if( !p_filter->p_sys->p_grad_x )
 584         p_filter->p_sys->p_grad_x =
 585                 (int32_t *)vlc_alloc( i_numLines * i_numCols,
 586                                       sizeof(int32_t));
 587     p_grad_x = p_filter->p_sys->p_grad_x;
 588
 589     if( !p_filter->p_sys->p_grad_y )
 590         p_filter->p_sys->p_grad_y =
 591                 (int32_t *)vlc_alloc( i_numLines * i_numCols,
 592                                       sizeof(int32_t));
 593     p_grad_y = p_filter->p_sys->p_grad_y;
 594
 595     if( !p_smooth || !p_grad_x || !p_grad_y ) return;
 596
 597     memcpy( p_outpic->p[0].p_pixels, p_inpic->p[0].p_pixels,
 598                 p_outpic->p[0].i_lines * p_outpic->p[0].i_pitch );
 599     memcpy( p_outpic->p[1].p_pixels, p_inpic->p[1].p_pixels,
 600                 p_outpic->p[1].i_lines * p_outpic->p[1].i_pitch );
 601     memcpy( p_outpic->p[2].p_pixels, p_inpic->p[2].p_pixels,
 602                 p_outpic->p[2].i_lines * p_outpic->p[2].i_pitch );
 603
 604     GaussianConvolution( p_converted, p_smooth );
 605
 606     /* Compute the picture Sobel gradient
 607        | -1 0 1 |     |  1  2  1 |
 608        | -2 0 2 | and |  0  0  0 |
 609        | -1 0 1 |     | -1 -2 -1 | */
 610
 611     for( int y = 1; y < i_numLines - 1; y++ )
 612     {
 613         for( int x = 1; x < i_numCols - 1; x++ )
 614         {
 615
 616             p_grad_x[ y * i_numCols + x ] =
 617                     ( p_smooth[(y-1)*i_numCols+x-1]
 618                     - p_smooth[(y+1)*i_numCols+x-1] )
 619                     + ( ( p_smooth[(y-1)*i_numCols+x]
 620                     - p_smooth[(y+1)*i_numCols+x] ) <<1 )
 621                     + ( p_smooth[(y-1)*i_numCols+x+1]
 622                     - p_smooth[(y+1)*i_numCols+x+1] );
 623             p_grad_y[ y * 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*i_numCols+x-1]
 627                     - p_smooth[y*i_numCols+x+1] ) <<1 )
 628                     + ( p_smooth[(y+1)*i_numCols+x-1]
 629                     - p_smooth[(y+1)*i_numCols+x+1] );
 630         }
 631     }
 632
 633     if( p_sys->b_edgeVisible )
 634     {
 635         /* Display the edges. */
 636         for( int y = 1; y < i_numLines - 1; y++ )
 637         {
 638             for( int x = 1; x < i_numCols - 1; x++ )
 639             {
 640                 if( abs( p_grad_x[ y * i_numCols + x ] )
 641                     + abs( p_grad_y[ y * i_numCols + x ] )
 642                     > p_sys->i_gradThresh )
 643                 {
 644                     ( *p_sys->drawingPixelFunction )( p_sys, p_outpic,
 645                                                       p_filter->p_sys->colorList[ WHITE ].comp1,
 646                                                       p_filter->p_sys->colorList[ WHITE ].comp2,
 647                                                       p_filter->p_sys->colorList[ WHITE ].comp3,
 648                                                       x, y, 0 );
 649                 }
 650             }
 651         }
 652     }
 653
 654     int i_motion;
 655
 656     float *pf_lastVect_x = &p_sys->f_lastVect_x;
 657     float *pf_lastVect_y = &p_sys->f_lastVect_y;
 658
 659     float f_newVect_x = 0;
 660     float f_newVect_y = 0;
 661     float f_contVect_x = 0;
 662     float f_contVect_y = 0;
 663
 664     int nb_collisions = 0;
 665
 666     bool bounce = false;
 667
 668     /* Test collisions for each pixel the ball will cover in its
 669        motion. */
 670     for ( i_motion = 0; i_motion <= p_sys->i_ballSpeed && !bounce; i_motion++ )
 671     {
 672         /* Compute next ball position */
 673         x = roundf( (float)p_sys->i_ball_x
 674                     + *pf_lastVect_x * (float)i_motion );
 675         y = roundf( (float)p_sys->i_ball_y
 676                     + *pf_lastVect_y * (float)i_motion );
 677
 678         for( int i = x - p_sys->i_ballSize; i <= x + p_sys->i_ballSize; i++ )
 679         {
 680             for( int j = y - p_sys->i_ballSize;
 681                  j <= y + p_sys->i_ballSize; j++ )
 682             {
 683                 /* Test the pixel if it is inside the disk and check we don't
 684                 write out the frame. */
 685                 if( ( i - x ) * ( i - x ) + ( j - y ) * ( j - y )
 686                     == p_sys->i_ballSize * p_sys->i_ballSize
 687                     && j <= i_numLines - 1 && x <= i_numCols - 1
 688                     && j >= 0 && i >= 0 )
 689                 {
 690                     /* Test firstly the picture limit collisions. */
 691                     if( i <= 2 )
 692                     {
 693                         f_contVect_x = x - i;
 694                         f_contVect_y = 0;
 695                         x++;
 696                         bounce = true;
 697                         nb_collisions = 1;
 698                         goto endLoop;
 699                     }
 700                     if( j <= 2 )
 701                     {
 702                         f_contVect_x = 0;
 703                         f_contVect_y = y - j;
 704                         y++;
 705                         bounce = true;
 706                         nb_collisions = 1;
 707                         goto endLoop;
 708                     }
 709                     if( j >= i_numLines - 3 )
 710                     {
 711                         f_contVect_x = 0;
 712                         f_contVect_y = y - j;
 713                         y--;
 714                         bounce = true;
 715                         nb_collisions = 1;
 716                         goto endLoop;
 717                     }
 718                     if( i >= i_numCols - 3 )
 719                     {
 720                         f_contVect_x = x - i;
 721                         f_contVect_y = 0;
 722                         x--;
 723                         bounce = true;
 724                         nb_collisions = 1;
 725                         goto endLoop;
 726                     }
 727                     /* Test the collisions with edges. */
 728                     if( abs( p_grad_x[ j * i_numCols + i ] )
 729                         + abs( p_grad_y[ j * i_numCols + i ] )
 730                         > p_sys->i_gradThresh )
 731                     {
 732                         f_contVect_x += x - i;
 733                         f_contVect_y += y - j;
 734                         nb_collisions++;
 735                         bounce = true;
 736                     }
 737                 }
 738             }
 739         }
 740     }
 741
 742     endLoop:
 743
 744     if( bounce )
 745     {
 746         /* Compute normal vector. */
 747         f_contVect_x /= nb_collisions;
 748         f_contVect_y /= nb_collisions;
 749         NormalizeVector( &f_contVect_x, &f_contVect_y );
 750
 751         /* Compute the new vector after the bounce. */
 752         float cosinus = *pf_lastVect_x * f_contVect_x
 753                         + *pf_lastVect_y * f_contVect_y;
 754         f_newVect_x = *pf_lastVect_x - 2 * cosinus * f_contVect_x;
 755         f_newVect_y = *pf_lastVect_y - 2 * cosinus * f_contVect_y;
 756         NormalizeVector( &f_newVect_x, &f_newVect_y );
 757
 758         *pf_lastVect_x = f_newVect_x;
 759         *pf_lastVect_y = f_newVect_y;
 760
 761         p_sys->i_ball_x = x;
 762         p_sys->i_ball_y = y;
 763
 764         /* Test if next pixel is outside the frame limits.
 765            If it is the case, then the ball is blocked until it can move. */
 766         x = roundf( (float)x + *pf_lastVect_x );
 767         y = roundf( (float)y + *pf_lastVect_y );
 768         if( x - p_sys->i_ballSize < 2
 769             || x + p_sys->i_ballSize > i_numCols - 3
 770             || y - p_sys->i_ballSize < 2
 771             || y + p_sys->i_ballSize > i_numLines - 3 )
 772         {
 773             *pf_lastVect_x = 0;
 774             *pf_lastVect_y = 0;
 775         }
 776         else
 777             /* After a bouce, the first ball motion is always one pixel. */
 778             i_motion = p_sys->i_ballSpeed - 1;
 779     }
 780     else
 781         i_motion = 0;
 782
 783     /* Compute next ball position. */
 784     p_sys->i_ball_x = roundf( (float)p_sys->i_ball_x + *pf_lastVect_x
 785                               * (float)( p_sys->i_ballSpeed - i_motion ) );
 786     p_sys->i_ball_y = roundf( p_sys->i_ball_y + *pf_lastVect_y
 787                               * (float)( p_sys->i_ballSpeed - i_motion ) );
 788
 789     /* Draw the ball */
 790     drawBall( p_sys, p_outpic );
 791
 792     switch( p_filter->fmt_in.video.i_chroma )
 793     {
 794         case VLC_CODEC_RGB24:
 795         CASE_PACKED_YUV_422
 796             picture_Release( p_converted );
 797         default:
 798             break;
 799     }
 800 }
 801
 802
 803 /*****************************************************************************
 804  * ballCallback
 805  *****************************************************************************
 806  * filter parameter modification callback
 807  *****************************************************************************/
 808 static int ballCallback( vlc_object_t *p_this, char const *psz_var,
 809                              vlc_value_t oldval, vlc_value_t newval,
 810                              void *p_data )
 811 {
 812     VLC_UNUSED(oldval);
 813     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 814     msg_Err( p_this, "Test" );
 815
 816     vlc_mutex_lock( &p_sys->lock );
 817     if( !strcmp( psz_var, FILTER_PREFIX "color" ) )
 818     {
 819         p_sys->ballColor = getBallColor( p_this, newval.psz_string );
 820     }
 821     else if( !strcmp( psz_var, FILTER_PREFIX "size" ) )
 822     {
 823         p_sys->i_ballSize = newval.i_int;
 824     }
 825     else if( !strcmp( psz_var, FILTER_PREFIX "speed" ) )
 826     {
 827         p_sys->i_ballSpeed = newval.i_int;
 828     }
 829     else if( !strcmp( psz_var, FILTER_PREFIX "edge-visible" ) )
 830     {
 831         p_sys->b_edgeVisible = newval.b_bool;
 832     }
 833     else if( !strcmp( psz_var, FILTER_PREFIX "gradient-threshold" ) )
 834     {
 835         p_sys->i_gradThresh = newval.i_int;
 836     }
 837     vlc_mutex_unlock( &p_sys->lock );
 838
 839     return VLC_SUCCESS;
 840 }
 841
 842
 843 /*****************************************************************************
 844  * getBallColor
 845  *****************************************************************************
 846  * Get and assign the ball color value
 847  *****************************************************************************/
 848 static int getBallColor( vlc_object_t *p_this, char const *psz_newval )
 849 {
 850     int ret;
 851     if( !strcmp( psz_newval, "red" ) )
 852         ret = RED;
 853     else if( !strcmp( psz_newval, "blue" ) )
 854         ret = BLUE;
 855     else if( !strcmp( psz_newval, "green" ) )
 856         ret = GREEN;
 857     else if( !strcmp( psz_newval, "white" ) )
 858         ret = WHITE;
 859     else
 860     {
 861         msg_Err( p_this, "no valid ball color provided (%s)", psz_newval );
 862         ret = RED;
 863     }
 864     return ret;
 865 }