git.sesse.net Git - vlc/blob - src/video_parser/vpar_synchro.c

   1 /*****************************************************************************
   2  * vpar_synchro.c : frame dropping routines
   3  *****************************************************************************
   4  * Copyright (C) 1999, 2000 VideoLAN
   5  * $Id: vpar_synchro.c,v 1.67 2000/12/29 10:52:40 massiot Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *          Samuel Hocevar <sam@via.ecp.fr>
   9  *          Jean-Marc Dressler <polux@via.ecp.fr>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  24  *****************************************************************************/
  25
  26 /*
  27  * DISCUSSION : How to Write an efficient Frame-Dropping Algorithm
  28  * ==========
  29  *
  30  * This implementation is based on mathematical and statistical
  31  * developments. Older implementations used an enslavement, considering
  32  * that if we're late when reading an I picture, we will decode one frame
  33  * less. It had a tendancy to derive, and wasn't responsive enough, which
  34  * would have caused trouble with the stream control stuff.
  35  *
  36  * 1. Structure of a picture stream
  37  *    =============================
  38  * Between 2 I's, we have for instance :
  39  *    I   B   P   B   P   B   P   B   P   B   P   B   I
  40  *    t0  t1  t2  t3  t4  t5  t6  t7  t8  t9  t10 t11 t12
  41  * Please bear in mind that B's and IP's will be inverted when displaying
  42  * (decoding order != presentation order). Thus, t1 < t0.
  43  *
  44  * FIXME: write a few words about stream structure changes.
  45  *
  46  * 2. Definitions
  47  *    ===========
  48  * t[0..12]     : Presentation timestamps of pictures 0..12.
  49  * t            : Current timestamp, at the moment of the decoding.
  50  * T            : Picture period, T = 1/frame_rate.
  51  * tau[I,P,B]   : Mean time to decode an [I,P,B] picture.
  52  * tauYUV       : Mean time to render a picture (given by the video_output).
  53  * tau´[I,P,B] = 2 * tau[I,P,B] + tauYUV
  54  *              : Mean time + typical difference (estimated to tau/2, that
  55  *                needs to be confirmed) + render time.
  56  * DELTA        : A given error margin.
  57  *
  58  * 3. General considerations
  59  *    ======================
  60  * We define three types of machines :
  61  *      14T > tauI : machines capable of decoding all I pictures
  62  *      2T > tauP  : machines capable of decoding all P pictures
  63  *      T > tauB   : machines capable of decoding all B pictures
  64  *
  65  * 4. Decoding of an I picture
  66  *    ========================
  67  * On fast machines, we decode all I's.
  68  * Otherwise :
  69  * We can decode an I picture if we simply have enough time to decode it
  70  * before displaying :
  71  *      t0 - t > tau´I + DELTA
  72  *
  73  * 5. Decoding of a P picture
  74  *    =======================
  75  * On fast machines, we decode all P's.
  76  * Otherwise :
  77  * First criterion : have time to decode it.
  78  *      t2 - t > tau´P + DELTA
  79  *
  80  * Second criterion : it shouldn't prevent us from displaying the forthcoming
  81  * I picture, which is more important.
  82  *      t12 - t > tau´P + tau´I + DELTA
  83  *
  84  * 6. Decoding of a B picture
  85  *    =======================
  86  * On fast machines, we decode all B's. Otherwise :
  87  *      t1 - t > tau´B + DELTA
  88  * Since the next displayed I or P is already decoded, we don't have to
  89  * worry about it.
  90  *
  91  * I hope you will have a pleasant flight and do not forget your life
  92  * jacket.
  93  *                                                  --Meuuh (2000-12-29)
  94  */
  95
  96 /*****************************************************************************
  97  * Preamble
  98  *****************************************************************************/
  99 #include "defs.h"
 100
 101 #include "config.h"
 102 #include "common.h"
 103 #include "threads.h"
 104 #include "mtime.h"
 105 #include "plugins.h"
 106
 107 #include "intf_msg.h"
 108
 109 #include "stream_control.h"
 110 #include "input_ext-dec.h"
 111
 112 #include "video.h"
 113 #include "video_output.h"
 114
 115 #include "../video_decoder/vdec_idct.h"
 116 #include "../video_decoder/video_decoder.h"
 117 #include "../video_decoder/vdec_motion.h"
 118
 119 #include "../video_decoder/vpar_blocks.h"
 120 #include "../video_decoder/vpar_headers.h"
 121 #include "../video_decoder/vpar_synchro.h"
 122 #include "../video_decoder/video_parser.h"
 123
 124 #include "main.h"
 125
 126 /*
 127  * Local prototypes
 128  */
 129 static int  SynchroType( void );
 130
 131 /* Error margins */
 132 #define DELTA                   (int)(0.040*CLOCK_FREQ)
 133 #define PTS_THRESHOLD           (int)(0.030*CLOCK_FREQ)
 134
 135 #define DEFAULT_NB_P            5
 136 #define DEFAULT_NB_B            1
 137
 138 /*****************************************************************************
 139  * vpar_SynchroInit : You know what ?
 140  *****************************************************************************/
 141 void vpar_SynchroInit( vpar_thread_t * p_vpar )
 142 {
 143     p_vpar->synchro.i_type = SynchroType();
 144     p_vpar->synchro.i_start = p_vpar->synchro.i_end = 0;
 145     vlc_mutex_init( &p_vpar->synchro.fifo_lock );
 146
 147     /* We use a fake stream pattern, which is often right. */
 148     p_vpar->synchro.i_n_p = p_vpar->synchro.i_eta_p = DEFAULT_NB_P;
 149     p_vpar->synchro.i_n_b = p_vpar->synchro.i_eta_b = DEFAULT_NB_B;
 150     memset( p_vpar->synchro.p_tau, 0, 4 * sizeof(mtime_t) );
 151     memset( p_vpar->synchro.pi_meaningful, 0, 4 * sizeof(unsigned int) );
 152     p_vpar->synchro.b_dropped_last = 0;
 153     p_vpar->synchro.current_pts = mdate() + DEFAULT_PTS_DELAY;
 154     p_vpar->synchro.backward_pts = 0;
 155 }
 156
 157 /*****************************************************************************
 158  * vpar_SynchroChoose : Decide whether we will decode a picture or not
 159  *****************************************************************************/
 160 boolean_t vpar_SynchroChoose( vpar_thread_t * p_vpar, int i_coding_type,
 161                               int i_structure )
 162 {
 163     /* For clarity reasons, we separated the special synchros code from the
 164      * mathematical synchro */
 165
 166     if( p_vpar->synchro.i_type != VPAR_SYNCHRO_DEFAULT )
 167     {
 168         switch( i_coding_type )
 169         {
 170         case I_CODING_TYPE:
 171             /* I, IP, IP+, IPB */
 172             if( p_vpar->synchro.i_type == VPAR_SYNCHRO_Iplus )
 173             {
 174                 p_vpar->synchro.b_dropped_last = 1;
 175             }
 176             return( 1 );
 177
 178         case P_CODING_TYPE:
 179             if( p_vpar->synchro.i_type == VPAR_SYNCHRO_I ) /* I */
 180             {
 181                 return( 0 );
 182             }
 183
 184             if( p_vpar->synchro.i_type == VPAR_SYNCHRO_Iplus ) /* I+ */
 185             {
 186                 if( p_vpar->synchro.b_dropped_last )
 187                 {
 188                     p_vpar->synchro.b_dropped_last = 0;
 189                     return( 1 );
 190                 }
 191                 else
 192                 {
 193                     return( 0 );
 194                 }
 195             }
 196
 197             return( 1 ); /* IP, IP+, IPB */
 198
 199         case B_CODING_TYPE:
 200             if( p_vpar->synchro.i_type <= VPAR_SYNCHRO_IP ) /* I, IP */
 201             {
 202                 return( 0 );
 203             }
 204             else if( p_vpar->synchro.i_type == VPAR_SYNCHRO_IPB ) /* IPB */
 205             {
 206                 return( 1 );
 207             }
 208
 209             p_vpar->synchro.b_dropped_last ^= 1; /* IP+ */
 210             return( !p_vpar->synchro.b_dropped_last );
 211         }
 212         return( 0 ); /* never reached but gcc yells at me */
 213     }
 214     else
 215     {
 216 #define TAU_PRIME( coding_type )    (p_vpar->synchro.p_tau[(coding_type)] \
 217                                  + (p_vpar->synchro.p_tau[(coding_type)] >> 1) \
 218                                             + tau_yuv)
 219 #define S                           p_vpar->synchro
 220         /* VPAR_SYNCHRO_DEFAULT */
 221         mtime_t         now, pts, period, tau_yuv;
 222         boolean_t       b_decode = 0;
 223 #ifdef DEBUG_VPAR
 224         char            p_date[MSTRTIME_MAX_SIZE];
 225 #endif
 226
 227         now = mdate();
 228         period = 1000000 / (p_vpar->sequence.i_frame_rate) * 1001;
 229
 230         vlc_mutex_lock( &p_vpar->p_vout->change_lock );
 231         tau_yuv = p_vpar->p_vout->render_time;
 232         vlc_mutex_unlock( &p_vpar->p_vout->change_lock );
 233
 234         vlc_mutex_lock( &p_vpar->synchro.fifo_lock );
 235
 236         switch( i_coding_type )
 237         {
 238         case I_CODING_TYPE:
 239             if( S.backward_pts )
 240             {
 241                 pts = S.backward_pts;
 242             }
 243             else
 244             {
 245                 /* displaying order : B B P B B I
 246                  *                      ^       ^
 247                  *                      |       +- current picture
 248                  *                      +- current PTS
 249                  */
 250                 pts = S.current_pts + period * (S.i_n_b + 2);
 251             }
 252
 253             if( (1 + S.i_n_p * (S.i_n_b + 1)) * period >
 254                     S.p_tau[I_CODING_TYPE] )
 255             {
 256                 b_decode = 1;
 257             }
 258             else
 259             {
 260                 b_decode = (pts - now) > (TAU_PRIME(I_CODING_TYPE) + DELTA);
 261             }
 262             if( !b_decode )
 263                 intf_WarnMsg( 3, "vpar synchro warning: trashing I" );
 264             break;
 265
 266         case P_CODING_TYPE:
 267             if( S.backward_pts )
 268             {
 269                 pts = S.backward_pts;
 270             }
 271             else
 272             {
 273                 pts = S.current_pts + period * (S.i_n_b + 1);
 274             }
 275
 276             if( (1 + S.i_n_p * (S.i_n_b + 1)) * period >
 277                     S.p_tau[I_CODING_TYPE] )
 278             {
 279                 if( (S.i_n_b + 1) * period > S.p_tau[P_CODING_TYPE] )
 280                 {
 281                     /* Security in case we're _really_ late */
 282                     b_decode = (pts - now > 0);
 283                 }
 284                 else
 285                 {
 286                     b_decode = (pts - now) > (TAU_PRIME(P_CODING_TYPE) + DELTA);
 287                     /* next I */
 288                     b_decode &= (pts - now
 289                                   + period
 290                               * ( (S.i_n_p - S.i_eta_p) * (1 + S.i_n_b) - 1 ))
 291                                 > (TAU_PRIME(P_CODING_TYPE)
 292                                     + TAU_PRIME(I_CODING_TYPE) + DELTA);
 293                 }
 294             }
 295             else
 296             {
 297                 b_decode = 0;
 298             }
 299             break;
 300
 301         case B_CODING_TYPE:
 302             pts = S.current_pts;
 303
 304             if( (S.i_n_b + 1) * period > S.p_tau[P_CODING_TYPE] )
 305             {
 306                 b_decode = (pts - now) > (TAU_PRIME(B_CODING_TYPE) + DELTA);
 307             }
 308             else
 309             {
 310                 b_decode = 0;
 311             }
 312         }
 313
 314         vlc_mutex_unlock( &p_vpar->synchro.fifo_lock );
 315 #ifdef DEBUG_VPAR
 316         intf_DbgMsg("vpar synchro debug: %s picture scheduled for %s, %s (%lld)",
 317                     i_coding_type == B_CODING_TYPE ? "B" :
 318                     (i_coding_type == P_CODING_TYPE ? "P" : "I"),
 319                     mstrtime(p_date, pts), b_decode ? "decoding" : "trashed",
 320                     S.p_tau[i_coding_type]);
 321 #endif
 322 #ifdef STATS
 323         if( !b_decode )
 324         {
 325             S.i_not_chosen_pic++;
 326         }
 327 #endif
 328         return( b_decode );
 329 #undef S
 330 #undef TAU_PRIME
 331     }
 332 }
 333
 334 /*****************************************************************************
 335  * vpar_SynchroTrash : Update counters when we trash a picture
 336  *****************************************************************************/
 337 void vpar_SynchroTrash( vpar_thread_t * p_vpar, int i_coding_type,
 338                         int i_structure )
 339 {
 340 #ifdef STATS
 341     p_vpar->synchro.i_trashed_pic++;
 342 #endif
 343 }
 344
 345 /*****************************************************************************
 346  * vpar_SynchroDecode : Update timers when we decide to decode a picture
 347  *****************************************************************************/
 348 void vpar_SynchroDecode( vpar_thread_t * p_vpar, int i_coding_type,
 349                          int i_structure )
 350 {
 351     vlc_mutex_lock( &p_vpar->synchro.fifo_lock );
 352
 353     if( ((p_vpar->synchro.i_end + 1 - p_vpar->synchro.i_start)
 354             % MAX_DECODING_PIC) )
 355     {
 356         p_vpar->synchro.p_date_fifo[p_vpar->synchro.i_end] = mdate();
 357         p_vpar->synchro.pi_coding_types[p_vpar->synchro.i_end] = i_coding_type;
 358
 359         FIFO_INCREMENT( i_end );
 360     }
 361     else
 362     {
 363         /* FIFO full, panic() */
 364         intf_ErrMsg("vpar error: synchro fifo full, estimations will be biased");
 365     }
 366     vlc_mutex_unlock( &p_vpar->synchro.fifo_lock );
 367 }
 368
 369 /*****************************************************************************
 370  * vpar_SynchroEnd : Called when the image is totally decoded
 371  *****************************************************************************/
 372 void vpar_SynchroEnd( vpar_thread_t * p_vpar, int i_garbage )
 373 {
 374     mtime_t     tau;
 375     int         i_coding_type;
 376
 377     vlc_mutex_lock( &p_vpar->synchro.fifo_lock );
 378
 379     if (!i_garbage)
 380     {
 381         tau = mdate() - p_vpar->synchro.p_date_fifo[p_vpar->synchro.i_start];
 382         i_coding_type = p_vpar->synchro.pi_coding_types[p_vpar->synchro.i_start];
 383
 384         /* Mean with average tau, to ensure stability. */
 385         p_vpar->synchro.p_tau[i_coding_type] =
 386             (p_vpar->synchro.pi_meaningful[i_coding_type]
 387              * p_vpar->synchro.p_tau[i_coding_type] + tau)
 388             / (p_vpar->synchro.pi_meaningful[i_coding_type] + 1);
 389         if( p_vpar->synchro.pi_meaningful[i_coding_type] < MAX_PIC_AVERAGE )
 390         {
 391             p_vpar->synchro.pi_meaningful[i_coding_type]++;
 392         }
 393 #ifdef DEBUG_VPAR
 394         intf_DbgMsg("vpar synchro debug: finished decoding %s (%lld)",
 395                     i_coding_type == B_CODING_TYPE ? "B" :
 396                     (i_coding_type == P_CODING_TYPE ? "P" : "I"), tau);
 397 #endif
 398     }
 399
 400     FIFO_INCREMENT( i_start );
 401
 402     vlc_mutex_unlock( &p_vpar->synchro.fifo_lock );
 403 }
 404
 405 /*****************************************************************************
 406  * vpar_SynchroDate : When an image has been decoded, ask for its date
 407  *****************************************************************************/
 408 mtime_t vpar_SynchroDate( vpar_thread_t * p_vpar )
 409 {
 410     /* No need to lock, since PTS are only used by the video parser. */
 411     return( p_vpar->synchro.current_pts );
 412 }
 413
 414 /*****************************************************************************
 415  * vpar_SynchroNewPicture: Update stream structure and PTS
 416  *****************************************************************************/
 417 void vpar_SynchroNewPicture( vpar_thread_t * p_vpar, int i_coding_type )
 418 {
 419     pes_packet_t *  p_pes;
 420     mtime_t         period = 1000000 / (p_vpar->sequence.i_frame_rate) * 1001;
 421
 422     switch( i_coding_type )
 423     {
 424     case I_CODING_TYPE:
 425         if( p_vpar->synchro.i_eta_p
 426                 && p_vpar->synchro.i_eta_p != p_vpar->synchro.i_n_p )
 427         {
 428             intf_WarnMsg( 1, "Stream periodicity changed from P[%d] to P[%d]",
 429                           p_vpar->synchro.i_n_p, p_vpar->synchro.i_eta_p );
 430             p_vpar->synchro.i_n_p = p_vpar->synchro.i_eta_p;
 431         }
 432         p_vpar->synchro.i_eta_p = p_vpar->synchro.i_eta_b = 0;
 433 #ifdef STATS
 434         if( p_vpar->synchro.i_type == VPAR_SYNCHRO_DEFAULT )
 435         {
 436             intf_Msg( "vpar synchro stats: I(%lld) P(%lld)[%d] B(%lld)[%d] YUV(%lld) : trashed %d:%d/%d",
 437                   p_vpar->synchro.p_tau[I_CODING_TYPE],
 438                   p_vpar->synchro.p_tau[P_CODING_TYPE],
 439                   p_vpar->synchro.i_n_p,
 440                   p_vpar->synchro.p_tau[B_CODING_TYPE],
 441                   p_vpar->synchro.i_n_b,
 442                   p_vpar->p_vout->render_time,
 443                   p_vpar->synchro.i_not_chosen_pic,
 444                   p_vpar->synchro.i_trashed_pic -
 445                   p_vpar->synchro.i_not_chosen_pic,
 446                   p_vpar->synchro.i_pic );
 447             p_vpar->synchro.i_trashed_pic = p_vpar->synchro.i_not_chosen_pic
 448                 = p_vpar->synchro.i_pic = 0;
 449         }
 450 #endif
 451         break;
 452     case P_CODING_TYPE:
 453         p_vpar->synchro.i_eta_p++;
 454         if( p_vpar->synchro.i_eta_b
 455                 && p_vpar->synchro.i_eta_b != p_vpar->synchro.i_n_b )
 456         {
 457             intf_WarnMsg( 1, "Stream periodicity changed from B[%d] to B[%d]",
 458                           p_vpar->synchro.i_n_b, p_vpar->synchro.i_eta_b );
 459             p_vpar->synchro.i_n_b = p_vpar->synchro.i_eta_b;
 460         }
 461         p_vpar->synchro.i_eta_b = 0;
 462         break;
 463     case B_CODING_TYPE:
 464         p_vpar->synchro.i_eta_b++;
 465         break;
 466     }
 467
 468     /* FIXME: use decoder_fifo callback */
 469     p_pes = DECODER_FIFO_START( *p_vpar->bit_stream.p_decoder_fifo );
 470
 471     p_vpar->synchro.current_pts += period;
 472
 473     if( i_coding_type == B_CODING_TYPE )
 474     {
 475         if( p_pes->i_pts )
 476         {
 477             if( p_pes->i_pts - p_vpar->synchro.current_pts > PTS_THRESHOLD
 478                  || p_vpar->synchro.current_pts - p_pes->i_pts > PTS_THRESHOLD )
 479             {
 480                 intf_WarnMsg( 2,
 481                         "vpar synchro warning: pts != current_date (%lld)",
 482                         p_vpar->synchro.current_pts - p_pes->i_pts );
 483             }
 484             p_vpar->synchro.current_pts = p_pes->i_pts;
 485             p_pes->i_pts = 0;
 486         }
 487     }
 488     else
 489     {
 490         if( p_vpar->synchro.backward_pts )
 491         {
 492             if( p_pes->i_dts &&
 493                 (p_pes->i_dts - p_vpar->synchro.backward_pts > PTS_THRESHOLD
 494               || p_vpar->synchro.backward_pts - p_pes->i_dts > PTS_THRESHOLD) )
 495             {
 496                 intf_WarnMsg( 2,
 497                         "vpar synchro warning: backward_pts != dts (%lld)",
 498                         p_vpar->synchro.backward_pts - p_pes->i_dts );
 499             }
 500
 501             if( p_vpar->synchro.backward_pts - p_vpar->synchro.current_pts
 502                     > PTS_THRESHOLD
 503                  || p_vpar->synchro.current_pts - p_vpar->synchro.backward_pts
 504                     > PTS_THRESHOLD )
 505             {
 506                 intf_WarnMsg( 2,
 507                    "vpar synchro warning: backward_pts != current_pts (%lld)",
 508                    p_vpar->synchro.current_pts - p_vpar->synchro.backward_pts );
 509             }
 510             p_vpar->synchro.current_pts = p_vpar->synchro.backward_pts;
 511             p_vpar->synchro.backward_pts = 0;
 512         }
 513         else if( p_pes->i_dts )
 514         {
 515             if( p_pes->i_dts - p_vpar->synchro.current_pts > PTS_THRESHOLD
 516                  || p_vpar->synchro.current_pts - p_pes->i_dts > PTS_THRESHOLD )
 517             {
 518                 intf_WarnMsg( 2,
 519                         "vpar synchro warning: dts != current_pts (%lld)",
 520                         p_vpar->synchro.current_pts - p_pes->i_dts );
 521             }
 522             /* By definition of a DTS. */
 523             p_vpar->synchro.current_pts = p_pes->i_dts;
 524             p_pes->i_dts = 0;
 525         }
 526
 527         if( p_pes->i_pts )
 528         {
 529             int     i_n_b;
 530
 531             /* Store the PTS for the next time we have to date an I picture. */
 532             p_vpar->synchro.backward_pts = p_pes->i_pts;
 533             p_pes->i_pts = 0;
 534
 535             i_n_b = (p_vpar->synchro.backward_pts
 536                         - p_vpar->synchro.current_pts) / period - 1;
 537             if( i_n_b != p_vpar->synchro.i_n_b )
 538             {
 539                 intf_WarnMsg( 1,
 540                         "Anticipating a stream periodicity change from"
 541                         " B[%d] to B[%d]",
 542                               p_vpar->synchro.i_n_b, i_n_b );
 543                 p_vpar->synchro.i_n_b = i_n_b;
 544             }
 545         }
 546     }
 547
 548 #ifdef STATS
 549     p_vpar->synchro.i_pic++;
 550 #endif
 551 }
 552
 553 /*****************************************************************************
 554  * SynchroType: Get the user's synchro type
 555  *****************************************************************************
 556  * This function is called at initialization.
 557  *****************************************************************************/
 558 static int SynchroType( void )
 559 {
 560     char * psz_synchro = main_GetPszVariable( VPAR_SYNCHRO_VAR, NULL );
 561
 562     if( psz_synchro == NULL )
 563     {
 564         return VPAR_SYNCHRO_DEFAULT;
 565     }
 566
 567     switch( *psz_synchro++ )
 568     {
 569       case 'i':
 570       case 'I':
 571         switch( *psz_synchro++ )
 572         {
 573           case '\0':
 574             return VPAR_SYNCHRO_I;
 575
 576           case '+':
 577             if( *psz_synchro ) return 0;
 578             return VPAR_SYNCHRO_Iplus;
 579
 580           case 'p':
 581           case 'P':
 582             switch( *psz_synchro++ )
 583             {
 584               case '\0':
 585                 return VPAR_SYNCHRO_IP;
 586
 587               case '+':
 588                 if( *psz_synchro ) return 0;
 589                 return VPAR_SYNCHRO_IPplus;
 590
 591               case 'b':
 592               case 'B':
 593                 if( *psz_synchro ) return 0;
 594                 return VPAR_SYNCHRO_IPB;
 595
 596               default:
 597                 return VPAR_SYNCHRO_DEFAULT;
 598
 599             }
 600
 601           default:
 602             return VPAR_SYNCHRO_DEFAULT;
 603         }
 604     }
 605
 606     return VPAR_SYNCHRO_DEFAULT;
 607 }
 608