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