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

   1 /*****************************************************************************
   2  * mirror.c : Mirror video plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2009 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Branko Kokanovic <branko.kokanovic@gmail.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <assert.h>
  33
  34 #include <vlc_common.h>
  35 #include <vlc_plugin.h>
  36 #include <vlc_atomic.h>
  37 #include <vlc_filter.h>
  38 #include "filter_picture.h"
  39
  40 /*****************************************************************************
  41  * Local prototypes
  42  *****************************************************************************/
  43 static int  Create      ( vlc_object_t * );
  44 static void Destroy     ( vlc_object_t * );
  45
  46 static picture_t *Filter( filter_t *, picture_t * );
  47 static void VerticalMirror( picture_t *, picture_t *, int plane, bool );
  48 static void HorizontalMirror( picture_t *, picture_t *, int, bool );
  49 static void PlanarVerticalMirror( picture_t *, picture_t *, int plane, bool );
  50 static void YUV422VerticalMirror( picture_t *, picture_t *, int plane, bool, bool );
  51 static void RV24VerticalMirror( picture_t *, picture_t *, int plane, bool );
  52 static void RV32VerticalMirror( picture_t *, picture_t *, int plane, bool );
  53
  54 static void YUV422Mirror2Pixels( uint8_t *, uint8_t *, bool );
  55
  56 static const char *const ppsz_filter_options[] = {
  57     "split", "direction", NULL
  58 };
  59
  60 /*****************************************************************************
  61  * Module descriptor
  62  *****************************************************************************/
  63 #define ORIENTATION_TEXT N_("Mirror orientation")
  64 #define ORIENTATION_LONGTEXT N_("Defines orientation of the mirror splitting. \
  65     Can be vertical or horizontal" )
  66 static const int pi_orientation_values[] = { 0, 1 };
  67 static const char *const ppsz_orientation_descriptions[] = {
  68   N_("Vertical"), N_("Horizontal") };
  69
  70 #define DIRECTION_TEXT N_("Direction")
  71 #define DIRECTION_LONGTEXT N_("Direction of the mirroring" )
  72 static const int pi_direction_values[] = { 0, 1 };
  73 static const char *const ppsz_direction_descriptions[] = {
  74   N_("Left to right/Top to bottom"), N_("Right to left/Bottom to top") };
  75
  76 #define CFG_PREFIX "mirror-"
  77
  78 vlc_module_begin ()
  79     set_description( N_("Mirror video filter") )
  80     set_shortname( N_("Mirror video" ))
  81     set_help( N_("Splits video in two same parts, like in a mirror") )
  82     set_category( CAT_VIDEO )
  83     set_subcategory( SUBCAT_VIDEO_VFILTER )
  84     set_capability( "video filter2", 0 )
  85     add_integer( CFG_PREFIX "split", 0, ORIENTATION_TEXT,
  86                 ORIENTATION_LONGTEXT, false )
  87         change_integer_list( pi_orientation_values,
  88                             ppsz_orientation_descriptions )
  89     add_integer( CFG_PREFIX "direction", 0, DIRECTION_TEXT,
  90                 DIRECTION_LONGTEXT, false )
  91         change_integer_list( pi_direction_values, ppsz_direction_descriptions )
  92     set_callbacks( Create, Destroy )
  93 vlc_module_end ()
  94
  95 /*****************************************************************************
  96  * callback prototypes
  97  *****************************************************************************/
  98 static int FilterCallback( vlc_object_t *, char const *,
  99                            vlc_value_t, vlc_value_t, void * );
 100
 101 /*****************************************************************************
 102  * filter_sys_t: adjust filter method descriptor
 103  *****************************************************************************/
 104 struct filter_sys_t
 105 {
 106     atomic_int i_split;
 107     atomic_int i_direction;
 108 };
 109
 110 /*****************************************************************************
 111  * Create: allocates Mirror video thread output method
 112  *****************************************************************************
 113  * This function allocates and initializes a Mirror vout method.
 114  *****************************************************************************/
 115 static int Create( vlc_object_t *p_this )
 116 {
 117     filter_t *p_filter = (filter_t *)p_this;
 118     filter_sys_t *p_sys;
 119
 120     switch( p_filter->fmt_in.video.i_chroma )
 121     {
 122         CASE_PLANAR_YUV_SQUARE
 123             break;
 124         CASE_PACKED_YUV_422
 125             break;
 126         case VLC_CODEC_RGB24:
 127         case VLC_CODEC_RGB32:
 128             break;
 129
 130         default:
 131             msg_Err( p_filter, "Unsupported input chroma (%4.4s)",
 132                      (char*)&(p_filter->fmt_in.video.i_chroma) );
 133             return VLC_EGENERIC;
 134     }
 135
 136     if( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma )
 137     {
 138         msg_Err( p_filter, "Input and output chromas don't match" );
 139         return VLC_EGENERIC;
 140     }
 141
 142     /* Allocate structure */
 143     p_sys = p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 144     if( p_filter->p_sys == NULL )
 145         return VLC_ENOMEM;
 146
 147     config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
 148                        p_filter->p_cfg );
 149     atomic_init( &p_sys->i_split,
 150                  var_CreateGetIntegerCommand( p_filter, CFG_PREFIX "split" ) );
 151     atomic_init( &p_sys->i_direction,
 152                  var_CreateGetIntegerCommand( p_filter,
 153                                                     CFG_PREFIX "direction" ) );
 154
 155     var_AddCallback( p_filter, CFG_PREFIX "split", FilterCallback, p_sys );
 156     var_AddCallback( p_filter, CFG_PREFIX "direction", FilterCallback, p_sys );
 157
 158     p_filter->pf_video_filter = Filter;
 159
 160     return VLC_SUCCESS;
 161 }
 162
 163 /*****************************************************************************
 164  * Destroy: destroy Mirror video thread output method
 165  *****************************************************************************
 166  * Terminate an output method created by MirrorCreateOutputMethod
 167  *****************************************************************************/
 168 static void Destroy( vlc_object_t *p_this )
 169 {
 170     filter_t *p_filter = (filter_t *)p_this;
 171     filter_sys_t *p_sys = p_filter->p_sys;
 172
 173     var_DelCallback( p_filter, CFG_PREFIX "split", FilterCallback, p_sys );
 174     var_DelCallback( p_filter, CFG_PREFIX "direction", FilterCallback, p_sys );
 175     free( p_sys );
 176 }
 177
 178 /*****************************************************************************
 179  * Render: displays previously rendered output
 180  *****************************************************************************
 181  * This function send the currently rendered image to Mirror image, waits
 182  * until it is displayed and switch the two rendering buffers, preparing next
 183  * frame.
 184  *****************************************************************************/
 185 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 186 {
 187     picture_t *p_outpic;
 188     bool b_vertical_split, b_left_to_right;
 189     int i_index;
 190
 191     if( !p_pic ) return NULL;
 192
 193     filter_sys_t *p_sys = p_filter->p_sys;
 194     b_vertical_split = !atomic_load( &p_sys->i_split );
 195     b_left_to_right = !atomic_load( &p_sys->i_direction );
 196
 197     p_outpic = filter_NewPicture( p_filter );
 198     if( !p_outpic )
 199     {
 200         msg_Warn( p_filter, "can't get output picture" );
 201         picture_Release( p_pic );
 202         return NULL;
 203     }
 204
 205     for( i_index = 0 ; i_index < p_pic->i_planes ; i_index++ )
 206     {
 207         if ( b_vertical_split )
 208             VerticalMirror( p_pic, p_outpic, i_index, b_left_to_right );
 209         else
 210             HorizontalMirror( p_pic, p_outpic, i_index, b_left_to_right );
 211     }
 212
 213     return CopyInfoAndRelease( p_outpic, p_pic );
 214 }
 215
 216 /*****************************************************************************
 217  * VerticalMirror: Mirrors vertically image
 218  *****************************************************************************
 219  * This function is a simple delegate to concrete function for vertical
 220  * mirroring depending on the input format.
 221  *****************************************************************************/
 222 static void VerticalMirror( picture_t *p_pic, picture_t *p_outpic, int i_plane,
 223                            bool b_left_to_right )
 224 {
 225     switch( p_pic->format.i_chroma )
 226     {
 227         CASE_PLANAR_YUV_SQUARE
 228             PlanarVerticalMirror( p_pic, p_outpic, i_plane, b_left_to_right );
 229             break;
 230         case VLC_CODEC_YUYV:
 231         case VLC_CODEC_YVYU:
 232             YUV422VerticalMirror( p_pic, p_outpic, i_plane, b_left_to_right,
 233                                  true );
 234             break;
 235         case VLC_CODEC_UYVY:
 236         case VLC_CODEC_CYUV:
 237             YUV422VerticalMirror( p_pic, p_outpic, i_plane, b_left_to_right,
 238                                  false );
 239             break;
 240         case VLC_CODEC_RGB24:
 241             RV24VerticalMirror( p_pic, p_outpic, i_plane, b_left_to_right );
 242             break;
 243         case VLC_CODEC_RGB32:
 244             RV32VerticalMirror( p_pic, p_outpic, i_plane, b_left_to_right );
 245             break;
 246         default:
 247             assert( false );
 248     }
 249 }
 250
 251 /*****************************************************************************
 252  * PlanarVerticalMirror: Mirrors vertically image byte by byte
 253  *****************************************************************************
 254  * This function mirrors image vertically. It iterates for all lines in
 255  * image and for every line, it mirrors byte for byte if needed.
 256  * This function works for planar formats only.
 257  *****************************************************************************/
 258 static void PlanarVerticalMirror( picture_t *p_pic, picture_t *p_outpic,
 259                                  int i_plane, bool b_left_to_right )
 260 {
 261     uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
 262
 263     p_in = p_pic->p[i_plane].p_pixels;
 264     p_in_end = p_in + p_pic->p[i_plane].i_visible_lines
 265         * p_pic->p[i_plane].i_pitch;
 266     p_out = p_outpic->p[i_plane].p_pixels;
 267
 268     while( p_in < p_in_end ) {
 269         p_line_start = p_in;
 270         p_line_end = p_in + p_pic->p[i_plane].i_visible_pitch;
 271         while( p_in < p_line_end )
 272         {
 273             /* are we in the left part of the line */
 274             if ( p_in < p_line_start + ( p_line_end - p_line_start ) / 2 )
 275             {
 276                 if ( b_left_to_right )
 277                     *p_out = *p_in;
 278                 else
 279                     *p_out = *( p_line_end - ( p_in - p_line_start ) );
 280             }
 281             else
 282             {
 283                 if ( b_left_to_right )
 284                     *p_out = *( p_line_start + ( p_line_end - p_in ) );
 285                 else
 286                     *p_out = *p_in;
 287             }
 288             p_in++;
 289             p_out++;
 290         }
 291         p_in += p_pic->p[i_plane].i_pitch - p_pic->p[i_plane].i_visible_pitch;
 292         p_out += p_outpic->p[i_plane].i_pitch
 293             - p_outpic->p[i_plane].i_visible_pitch;
 294     }
 295 }
 296
 297 /*****************************************************************************
 298  * YUV422VerticalMirror: Mirrors vertically image byte by byte for YUV422 format
 299  *****************************************************************************
 300  * This function mirrors image vertically. It iterates for all lines in
 301  * image and for every line, iterates for 4-byte chucks, properly mirroring
 302  * them vertically (swapping Y components and keeping Cb and Cr components).
 303  * This function works only for YUV422 packed formats.
 304  *****************************************************************************/
 305 static void YUV422VerticalMirror( picture_t *p_pic, picture_t *p_outpic,
 306                                  int i_plane, bool b_left_to_right,
 307                                  bool b_y_is_odd )
 308 {
 309     uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
 310
 311     p_in = p_pic->p[i_plane].p_pixels;
 312     p_in_end = p_in + p_pic->p[i_plane].i_visible_lines
 313         * p_pic->p[i_plane].i_pitch;
 314     p_out = p_outpic->p[i_plane].p_pixels;
 315
 316     while( p_in < p_in_end )
 317     {
 318         p_line_start = p_in;
 319         p_line_end = p_in + p_pic->p[i_plane].i_visible_pitch;
 320         while( p_in < p_line_end )
 321         {
 322             /* are we in the left part of the line */
 323             if ( p_in < p_line_start + ( p_line_end - p_line_start ) / 2 )
 324             {
 325                 if ( b_left_to_right )
 326                 {
 327                     *p_out++ = *p_in++;
 328                     *p_out++ = *p_in++;
 329                     *p_out++ = *p_in++;
 330                     *p_out++ = *p_in++;
 331                 }
 332                 else
 333                 {
 334                     uint8_t *p_start = p_line_end - ( p_in - p_line_start );
 335                     YUV422Mirror2Pixels( p_out, p_start, b_y_is_odd );
 336                     p_in += 4;
 337                     p_out += 4;
 338                 }
 339             }
 340             else
 341             {
 342                 if ( b_left_to_right )
 343                 {
 344                     uint8_t *p_start = p_line_end - ( p_in - p_line_start );
 345                     YUV422Mirror2Pixels( p_out, p_start, b_y_is_odd );
 346                     p_in += 4;
 347                     p_out += 4;
 348                 }
 349                 else
 350                 {
 351                     *p_out++ = *p_in++;
 352                     *p_out++ = *p_in++;
 353                     *p_out++ = *p_in++;
 354                     *p_out++ = *p_in++;
 355                 }
 356             }
 357         }
 358         p_in += p_pic->p[i_plane].i_pitch - p_pic->p[i_plane].i_visible_pitch;
 359         p_out += p_outpic->p[i_plane].i_pitch
 360             - p_outpic->p[i_plane].i_visible_pitch;
 361     }
 362 }
 363
 364 /*****************************************************************************
 365  * YUV422Mirror2Pixels: Mirrors 2 consecutive pixels
 366  *****************************************************************************
 367  * This function mirrors two consecutive pixels of 4 byte size. Depending of
 368  * position of Y components (b_y_is_odd is true if Y components are first and
 369  * third (like in YUYV or YVYU), they are properly swapped, and Cb and Cr
 370  * component positions are preserved.
 371  *****************************************************************************/
 372 static void YUV422Mirror2Pixels( uint8_t* p_dst, uint8_t *p_src,
 373                                 bool b_y_is_odd )
 374 {
 375     if ( b_y_is_odd )
 376     {
 377         /* swap Y components */
 378         *p_dst = *( p_src + 2 );
 379         *( p_dst + 2 ) = *p_src;
 380         /* copy Cb and Cr components */
 381         *( p_dst + 1 ) = *( p_src + 1 );
 382         *( p_dst + 3 ) = *( p_src + 3 );
 383     }
 384     else{
 385         /* swap Y components */
 386         *( p_dst + 1 )= *( p_src + 3 );
 387         *( p_dst + 3 ) = *( p_src + 1);
 388         /* copy Cb and Cr components */
 389         *p_dst = *( p_src + 2 );
 390         *( p_dst + 2 ) = *p_src;
 391     }
 392 }
 393
 394 /*****************************************************************************
 395  * RV24VerticalMirror: Mirrors vertically image byte by byte for RV24 format
 396  *****************************************************************************
 397  * This function mirrors image vertically. It iterates for all lines in
 398  * image and for every line, it iterates for 3-byte chunks.
 399  * This function works only for RV24 formats.
 400  *****************************************************************************/
 401 static void RV24VerticalMirror( picture_t *p_pic, picture_t *p_outpic,
 402                                  int i_plane, bool b_left_to_right )
 403 {
 404     uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
 405
 406     p_in = p_pic->p[i_plane].p_pixels;
 407     p_in_end = p_in + p_pic->p[i_plane].i_visible_lines
 408         * p_pic->p[i_plane].i_pitch;
 409     p_out = p_outpic->p[i_plane].p_pixels;
 410
 411     while( p_in < p_in_end )
 412     {
 413         p_line_start = p_in;
 414         p_line_end = p_in + p_pic->p[i_plane].i_visible_pitch;
 415         while( p_in < p_line_end )
 416         {
 417             /* are we in the left part of the line */
 418             if ( p_in < p_line_start + ( p_line_end - p_line_start ) / 2 )
 419             {
 420                 if ( b_left_to_right )
 421                 {
 422                     *p_out++ = *p_in++;
 423                     *p_out++ = *p_in++;
 424                     *p_out++ = *p_in++;
 425                 }
 426                 else
 427                 {
 428                     uint8_t *p_pixel = p_line_end - ( p_in - p_line_start );
 429                     p_in += 3;
 430                     *p_out++ = *p_pixel++;
 431                     *p_out++ = *p_pixel++;
 432                     *p_out++ = *p_pixel++;
 433                 }
 434             }
 435             else
 436             {
 437                 if ( b_left_to_right )
 438                 {
 439                     uint8_t *p_pixel = p_line_end - ( p_in - p_line_start );
 440                     p_in += 3;
 441                     *p_out++ = *p_pixel++;
 442                     *p_out++ = *p_pixel++;
 443                     *p_out++ = *p_pixel++;
 444                 }
 445                 else
 446                 {
 447                     *p_out++ = *p_in++;
 448                     *p_out++ = *p_in++;
 449                     *p_out++ = *p_in++;
 450                 }
 451             }
 452         }
 453         p_in += p_pic->p[i_plane].i_pitch - p_pic->p[i_plane].i_visible_pitch;
 454         p_out += p_outpic->p[i_plane].i_pitch
 455             - p_outpic->p[i_plane].i_visible_pitch;
 456     }
 457 }
 458
 459 /*****************************************************************************
 460  * RV32VerticalMirror: Mirrors vertically image byte by byte for RV32 format
 461  *****************************************************************************
 462  * This function mirrors image vertically. It iterates for all lines in
 463  * image and for every line, it iterates for 4-byte chunks as 32-bit pointers.
 464  * This function works only for RV32 formats.
 465  *****************************************************************************/
 466 static void RV32VerticalMirror( picture_t *p_pic, picture_t *p_outpic,
 467                                  int i_plane, bool b_left_to_right )
 468 {
 469     uint8_t *p_in, *p_in_end, *p_out;
 470
 471     p_in = p_pic->p[i_plane].p_pixels;
 472     p_in_end = p_in + p_pic->p[i_plane].i_visible_lines
 473         * p_pic->p[i_plane].i_pitch;
 474     p_out = p_outpic->p[i_plane].p_pixels;
 475
 476     while( p_in < p_in_end )
 477     {
 478         uint32_t *p_in32, *p_out32, *p_line_start32, *p_line_end32;
 479         p_in32 = (uint32_t*) p_in;
 480         p_out32 = (uint32_t*) p_out;
 481         p_line_start32 = p_in32;
 482         p_line_end32 = (uint32_t*) ( p_in + p_pic->p[i_plane].i_visible_pitch) ;
 483
 484         while( p_in32 < p_line_end32 )
 485         {
 486             /* are we in the left part of the line */
 487             if ( p_in32 < p_line_start32 + ( p_line_end32 - p_line_start32 ) / 2 )
 488             {
 489                 if ( b_left_to_right )
 490                 {
 491                     *p_out32++ = *p_in32++;
 492                 }
 493                 else
 494                 {
 495                     uint32_t *p_pixel32 = p_line_end32 - ( p_in32 - p_line_start32 );
 496                     p_in32++;
 497                     *p_out++ = *p_pixel32;
 498                 }
 499             }
 500             else
 501             {
 502                 if ( b_left_to_right )
 503                 {
 504                     uint32_t *p_pixel32 = p_line_end32 - ( p_in32 - p_line_start32 );
 505                     p_in32++;
 506                     *p_out++ = *p_pixel32;
 507                 }
 508                 else
 509                 {
 510                     *p_out32++ = *p_in32++;
 511                 }
 512             }
 513         }
 514         p_in = (uint8_t*) p_in32;
 515         p_out = (uint8_t*) p_out32;
 516         p_in += p_pic->p[i_plane].i_pitch - p_pic->p[i_plane].i_visible_pitch;
 517         p_out += p_outpic->p[i_plane].i_pitch
 518             - p_outpic->p[i_plane].i_visible_pitch;
 519     }
 520 }
 521
 522 /*****************************************************************************
 523  * HorizontalMirror: Mirrors horizontally image byte by byte
 524  *****************************************************************************
 525  * This function mirrors image horizontally. It iterates for all lines in
 526  * image and for every line, determines if it should be copied, and if it does,
 527  * finds opposite line in picture and copies current byte from opposite line.
 528  * This function works both for planar, packed and RV24 formats.
 529  *****************************************************************************/
 530 static void HorizontalMirror( picture_t *p_pic, picture_t *p_outpic, int i_plane,
 531                              bool b_top_to_bottom )
 532 {
 533     uint8_t *p_in, *p_in_end, *p_line_start, *p_line_end, *p_out;
 534
 535     int i_curr_line = 0;
 536     int i_max_lines = p_pic->p[i_plane].i_visible_lines;
 537
 538     p_in = p_pic->p[i_plane].p_pixels;
 539     p_in_end = p_in + p_pic->p[i_plane].i_visible_lines
 540         * p_pic->p[i_plane].i_pitch;
 541     p_out = p_outpic->p[i_plane].p_pixels;
 542
 543     while( p_in < p_in_end )
 544     {
 545         p_line_start = p_in;
 546         p_line_end = p_in + p_pic->p[i_plane].i_visible_pitch;
 547         while( p_in < p_line_end )
 548         {
 549             uint8_t *p_inverse_line;
 550             /* are we in the upper part of the picture */
 551             if ( i_curr_line < i_max_lines/2 )
 552             {
 553                 if ( b_top_to_bottom )
 554                 {
 555                     *p_out = *p_in;
 556                 }
 557                 else
 558                 {
 559                     /* determines line inverse to current line */
 560                     p_inverse_line = p_pic->p[i_plane].p_pixels +
 561                         ( i_max_lines - i_curr_line - 1 ) * p_pic->p[i_plane].i_pitch;
 562                     *p_out = *( p_inverse_line + ( p_in - p_line_start ) );
 563                 }
 564             }
 565             else
 566             {
 567                 if ( b_top_to_bottom )
 568                 {
 569                     /* determines line inverse to current line */
 570                     p_inverse_line = p_pic->p[i_plane].p_pixels +
 571                         ( i_max_lines - i_curr_line - 1 ) * p_pic->p[i_plane].i_pitch;
 572                     *p_out = *( p_inverse_line + ( p_in - p_line_start ) );
 573                 }
 574                 else
 575                 {
 576                     *p_out = *p_in;
 577                 }
 578             }
 579             p_in++;
 580             p_out++;
 581         }
 582         i_curr_line++;
 583         p_in += p_pic->p[i_plane].i_pitch - p_pic->p[i_plane].i_visible_pitch;
 584         p_out += p_outpic->p[i_plane].i_pitch
 585             - p_outpic->p[i_plane].i_visible_pitch;
 586     }
 587 }
 588
 589 static int FilterCallback ( vlc_object_t *p_this, char const *psz_var,
 590                             vlc_value_t oldval, vlc_value_t newval, void *p_data )
 591 {
 592     (void) p_this; (void)oldval;
 593     filter_sys_t *p_sys = p_data;
 594
 595     if( !strcmp( psz_var, CFG_PREFIX "split" ) )
 596         atomic_store( &p_sys->i_split, newval.i_int );
 597     else /* CFG_PREFIX "direction" */
 598         atomic_store( &p_sys->i_direction, newval.i_int );
 599
 600     return VLC_SUCCESS;
 601 }