git.sesse.net Git - vlc/blob - src/video_output/video_output.c

   1 /*****************************************************************************
   2  * video_output.c : video output thread
   3  * This module describes the programming interface for video output threads.
   4  * It includes functions allowing to open a new thread, send pictures to a
   5  * thread, and destroy a previously oppened video output thread.
   6  *****************************************************************************
   7  * Copyright (C) 2000-2001 VideoLAN
   8  * $Id: video_output.c,v 1.204 2002/12/18 08:08:29 gbazin Exp $
   9  *
  10  * Authors: Vincent Seguin <seguin@via.ecp.fr>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  25  *****************************************************************************/
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30 #include <stdlib.h>                                                /* free() */
  31
  32 #include <vlc/vlc.h>
  33
  34 #ifdef HAVE_SYS_TIMES_H
  35 #   include <sys/times.h>
  36 #endif
  37
  38 #include "video.h"
  39 #include "video_output.h"
  40
  41 #if defined( SYS_DARWIN )
  42 #include "darwin_specific.h"
  43 #endif
  44
  45 /*****************************************************************************
  46  * Local prototypes
  47  *****************************************************************************/
  48 static int      InitThread        ( vout_thread_t * );
  49 static void     RunThread         ( vout_thread_t * );
  50 static void     ErrorThread       ( vout_thread_t * );
  51 static void     EndThread         ( vout_thread_t * );
  52 static void     DestroyThread     ( vout_thread_t * );
  53
  54 static int      ReduceHeight      ( int );
  55 static int      BinaryLog         ( uint32_t );
  56 static void     MaskToShift       ( int *, int *, uint32_t );
  57 static void     InitWindowSize    ( vout_thread_t *, int *, int * );
  58
  59 /*****************************************************************************
  60  * vout_Request: find a video output thread, create one, or destroy one.
  61  *****************************************************************************
  62  * This function looks for a video output thread matching the current
  63  * properties. If not found, it spawns a new one.
  64  *****************************************************************************/
  65 vout_thread_t * __vout_Request ( vlc_object_t *p_this, vout_thread_t *p_vout,
  66                                  unsigned int i_width, unsigned int i_height,
  67                                  vlc_fourcc_t i_chroma, unsigned int i_aspect )
  68 {
  69     if( !i_width || !i_height || !i_chroma )
  70     {
  71         /* Reattach video output to p_vlc before bailing out */
  72         if( p_vout )
  73         {
  74             vlc_object_detach( p_vout );
  75             vlc_object_attach( p_vout, p_this->p_vlc );
  76         }
  77
  78         return NULL;
  79     }
  80
  81     /* If a video output was provided, lock it, otherwise look for one. */
  82     if( p_vout )
  83     {
  84         vlc_object_yield( p_vout );
  85     }
  86     else
  87     {
  88         p_vout = vlc_object_find( p_this, VLC_OBJECT_VOUT, FIND_CHILD );
  89
  90         if( !p_vout )
  91         {
  92             p_vout = vlc_object_find( p_this, VLC_OBJECT_VOUT, FIND_ANYWHERE );
  93         }
  94     }
  95
  96     /* If we now have a video output, check it has the right properties */
  97     if( p_vout )
  98     {
  99         if( ( p_vout->render.i_width != i_width ) ||
 100             ( p_vout->render.i_height != i_height ) ||
 101             ( p_vout->render.i_chroma != i_chroma ) ||
 102             ( p_vout->render.i_aspect != i_aspect ) )
 103         {
 104             /* We are not interested in this format, close this vout */
 105             vlc_object_detach( p_vout );
 106             vlc_object_release( p_vout );
 107             vout_Destroy( p_vout );
 108             p_vout = NULL;
 109         }
 110         else
 111         {
 112             /* This video output is cool! Hijack it. */
 113             vlc_object_detach( p_vout );
 114             vlc_object_attach( p_vout, p_this );
 115             vlc_object_release( p_vout );
 116         }
 117     }
 118
 119     if( !p_vout )
 120     {
 121         msg_Dbg( p_this, "no usable vout present, spawning one" );
 122
 123         p_vout = vout_Create( p_this, i_width, i_height, i_chroma, i_aspect );
 124     }
 125
 126     return p_vout;
 127 }
 128
 129 /*****************************************************************************
 130  * vout_Create: creates a new video output thread
 131  *****************************************************************************
 132  * This function creates a new video output thread, and returns a pointer
 133  * to its description. On error, it returns NULL.
 134  *****************************************************************************/
 135 vout_thread_t * __vout_Create( vlc_object_t *p_parent,
 136                                unsigned int i_width, unsigned int i_height,
 137                                vlc_fourcc_t i_chroma, unsigned int i_aspect )
 138 {
 139     vout_thread_t * p_vout;                             /* thread descriptor */
 140     int             i_index;                                /* loop variable */
 141     char          * psz_plugin;
 142     vlc_value_t     val;
 143
 144     /* Allocate descriptor */
 145     p_vout = vlc_object_create( p_parent, VLC_OBJECT_VOUT );
 146     if( p_vout == NULL )
 147     {
 148         msg_Err( p_parent, "out of memory" );
 149         return NULL;
 150     }
 151
 152     var_Create( p_vout, "intf-change", VLC_VAR_BOOL );
 153     val.b_bool = VLC_TRUE;
 154     var_Set( p_vout, "intf-change", val );
 155
 156     /* If the parent is not a VOUT object, that means we are at the start of
 157      * the video output pipe */
 158     if( p_parent->i_object_type != VLC_OBJECT_VOUT )
 159     {
 160         char *psz_aspect = config_GetPsz( p_parent, "aspect-ratio" );
 161
 162         /* Check whether the user tried to override aspect ratio */
 163         if( psz_aspect )
 164         {
 165             unsigned int i_new_aspect = i_aspect;
 166             char *psz_parser = strchr( psz_aspect, ':' );
 167
 168             if( psz_parser )
 169             {
 170                 *psz_parser++ = '\0';
 171                 i_new_aspect = atoi( psz_aspect ) * VOUT_ASPECT_FACTOR
 172                                                   / atoi( psz_parser );
 173             }
 174             else
 175             {
 176                 i_new_aspect = i_width * VOUT_ASPECT_FACTOR
 177                                        * atof( psz_aspect )
 178                                        / i_height;
 179             }
 180
 181             free( psz_aspect );
 182
 183             if( i_new_aspect && i_new_aspect != i_aspect )
 184             {
 185                 int i_pgcd = ReduceHeight( i_new_aspect );
 186
 187                 msg_Dbg( p_vout, "overriding source aspect ratio to %i:%i",
 188                          i_new_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 189
 190                 i_aspect = i_new_aspect;
 191             }
 192         }
 193
 194         /* Look for the default filter configuration */
 195         p_vout->psz_filter_chain = config_GetPsz( p_parent, "filter" );
 196     }
 197     else
 198     {
 199         /* continue the parent's filter chain */
 200         char *psz_end;
 201
 202         psz_end = strchr( ((vout_thread_t *)p_parent)->psz_filter_chain, ':' );
 203         if( psz_end && *(psz_end+1) )
 204             p_vout->psz_filter_chain = strdup( psz_end+1 );
 205         else p_vout->psz_filter_chain = NULL;
 206     }
 207
 208     /* Choose the video output module */
 209     if( !p_vout->psz_filter_chain )
 210     {
 211         psz_plugin = config_GetPsz( p_parent, "vout" );
 212     }
 213     else
 214     {
 215         /* the filter chain is a string list of filters separated by double
 216          * colons */
 217         char *psz_end;
 218
 219         psz_end = strchr( p_vout->psz_filter_chain, ':' );
 220         if( psz_end )
 221             psz_plugin = strndup( p_vout->psz_filter_chain,
 222                                   psz_end - p_vout->psz_filter_chain );
 223         else psz_plugin = strdup( p_vout->psz_filter_chain );
 224     }
 225
 226     /* Initialize pictures and subpictures - translation tables and functions
 227      * will be initialized later in InitThread */
 228     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++)
 229     {
 230         p_vout->p_picture[i_index].i_status = FREE_PICTURE;
 231         p_vout->p_picture[i_index].i_type   = EMPTY_PICTURE;
 232     }
 233
 234     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++)
 235     {
 236         p_vout->p_subpicture[i_index].i_status = FREE_SUBPICTURE;
 237         p_vout->p_subpicture[i_index].i_type   = EMPTY_SUBPICTURE;
 238     }
 239
 240     /* No images in the heap */
 241     p_vout->i_heap_size = 0;
 242
 243     /* Initialize the rendering heap */
 244     I_RENDERPICTURES = 0;
 245     p_vout->render.i_width    = i_width;
 246     p_vout->render.i_height   = i_height;
 247     p_vout->render.i_chroma   = i_chroma;
 248     p_vout->render.i_aspect   = i_aspect;
 249
 250     p_vout->render.i_rmask    = 0;
 251     p_vout->render.i_gmask    = 0;
 252     p_vout->render.i_bmask    = 0;
 253
 254     p_vout->render.i_last_used_pic = -1;
 255     p_vout->render.b_allow_modify_pics = 1;
 256
 257     /* Zero the output heap */
 258     I_OUTPUTPICTURES = 0;
 259     p_vout->output.i_width    = 0;
 260     p_vout->output.i_height   = 0;
 261     p_vout->output.i_chroma   = 0;
 262     p_vout->output.i_aspect   = 0;
 263
 264     p_vout->output.i_rmask    = 0;
 265     p_vout->output.i_gmask    = 0;
 266     p_vout->output.i_bmask    = 0;
 267
 268     /* Initialize misc stuff */
 269     p_vout->i_changes    = 0;
 270     p_vout->f_gamma      = 0;
 271     p_vout->b_grayscale  = 0;
 272     p_vout->b_info       = 0;
 273     p_vout->b_interface  = 0;
 274     p_vout->b_scale      = 1;
 275     p_vout->b_fullscreen = 0;
 276     p_vout->render_time  = 10;
 277     p_vout->c_fps_samples= 0;
 278
 279     /* Mouse coordinates */
 280     var_Create( p_vout, "mouse-x", VLC_VAR_INTEGER );
 281     var_Create( p_vout, "mouse-y", VLC_VAR_INTEGER );
 282     var_Create( p_vout, "mouse-moved", VLC_VAR_BOOL );
 283     var_Create( p_vout, "mouse-clicked", VLC_VAR_INTEGER );
 284
 285     /* user requested fullscreen? */
 286     if( config_GetInt( p_vout, "fullscreen" ) )
 287     {
 288         p_vout->i_changes |= VOUT_FULLSCREEN_CHANGE;
 289     }
 290
 291     /* Initialize the dimensions of the video window */
 292     InitWindowSize( p_vout, &p_vout->i_window_width,
 293                     &p_vout->i_window_height );
 294
 295
 296     p_vout->p_module = module_Need( p_vout,
 297                            ( p_vout->psz_filter_chain ) ?
 298                            "video filter" : "video output",
 299                            psz_plugin );
 300
 301     if( psz_plugin ) free( psz_plugin );
 302     if( p_vout->p_module == NULL )
 303     {
 304         msg_Err( p_vout, "no suitable vout module" );
 305         vlc_object_destroy( p_vout );
 306         return NULL;
 307     }
 308
 309     /* Create thread and set locks */
 310     vlc_mutex_init( p_vout, &p_vout->picture_lock );
 311     vlc_mutex_init( p_vout, &p_vout->subpicture_lock );
 312     vlc_mutex_init( p_vout, &p_vout->change_lock );
 313
 314     vlc_object_attach( p_vout, p_parent );
 315
 316     if( vlc_thread_create( p_vout, "video output", RunThread,
 317                            VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
 318     {
 319         msg_Err( p_vout, "out of memory" );
 320         module_Unneed( p_vout, p_vout->p_module );
 321         vlc_object_destroy( p_vout );
 322         return NULL;
 323     }
 324
 325     return p_vout;
 326 }
 327
 328 /*****************************************************************************
 329  * vout_Destroy: destroys a previously created video output
 330  *****************************************************************************
 331  * Destroy a terminated thread.
 332  * The function will request a destruction of the specified thread. If pi_error
 333  * is NULL, it will return once the thread is destroyed. Else, it will be
 334  * update using one of the THREAD_* constants.
 335  *****************************************************************************/
 336 void vout_Destroy( vout_thread_t *p_vout )
 337 {
 338     /* Request thread destruction */
 339     p_vout->b_die = VLC_TRUE;
 340     vlc_thread_join( p_vout );
 341
 342     var_Destroy( p_vout, "intf-change" );
 343
 344     /* Free structure */
 345     vlc_object_destroy( p_vout );
 346 }
 347
 348 /*****************************************************************************
 349  * InitThread: initialize video output thread
 350  *****************************************************************************
 351  * This function is called from RunThread and performs the second step of the
 352  * initialization. It returns 0 on success. Note that the thread's flag are not
 353  * modified inside this function.
 354  *****************************************************************************/
 355 static int InitThread( vout_thread_t *p_vout )
 356 {
 357     int i, i_pgcd;
 358
 359     vlc_mutex_lock( &p_vout->change_lock );
 360
 361 #ifdef STATS
 362     p_vout->c_loops = 0;
 363 #endif
 364
 365     /* Initialize output method, it allocates direct buffers for us */
 366     if( p_vout->pf_init( p_vout ) )
 367     {
 368         vlc_mutex_unlock( &p_vout->change_lock );
 369         return VLC_EGENERIC;
 370     }
 371
 372     if( !I_OUTPUTPICTURES )
 373     {
 374         msg_Err( p_vout, "plugin was unable to allocate at least "
 375                          "one direct buffer" );
 376         p_vout->pf_end( p_vout );
 377         vlc_mutex_unlock( &p_vout->change_lock );
 378         return VLC_EGENERIC;
 379     }
 380
 381     if( I_OUTPUTPICTURES > VOUT_MAX_PICTURES )
 382     {
 383         msg_Err( p_vout, "plugin allocated too many direct buffers, "
 384                          "our internal buffers must have overflown." );
 385         p_vout->pf_end( p_vout );
 386         vlc_mutex_unlock( &p_vout->change_lock );
 387         return VLC_EGENERIC;
 388     }
 389
 390     msg_Dbg( p_vout, "got %i direct buffer(s)", I_OUTPUTPICTURES );
 391
 392 #if 0
 393     if( !p_vout->psz_filter_chain )
 394     {
 395         char *psz_aspect = config_GetPsz( p_vout, "pixel-ratio" );
 396
 397         if( psz_aspect )
 398         {
 399             int i_new_aspect = p_vout->output.i_width * VOUT_ASPECT_FACTOR
 400                                                       * atof( psz_aspect )
 401                                                       / p_vout->output.i_height;
 402             free( psz_aspect );
 403
 404             if( i_new_aspect && i_new_aspect != p_vout->output.i_aspect )
 405             {
 406                 int i_pgcd = ReduceHeight( i_new_aspect );
 407                 msg_Dbg( p_vout, "output ratio forced to %i:%i\n",
 408                          i_new_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 409                 p_vout->output.i_aspect = i_new_aspect;
 410             }
 411         }
 412     }
 413 #endif
 414
 415     i_pgcd = ReduceHeight( p_vout->render.i_aspect );
 416     msg_Dbg( p_vout,
 417              "picture in %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 418              p_vout->render.i_width, p_vout->render.i_height,
 419              p_vout->render.i_chroma, (char*)&p_vout->render.i_chroma,
 420              p_vout->render.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 421
 422     i_pgcd = ReduceHeight( p_vout->output.i_aspect );
 423     msg_Dbg( p_vout,
 424              "picture out %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 425              p_vout->output.i_width, p_vout->output.i_height,
 426              p_vout->output.i_chroma, (char*)&p_vout->output.i_chroma,
 427              p_vout->output.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 428
 429     /* Calculate shifts from system-updated masks */
 430     MaskToShift( &p_vout->output.i_lrshift, &p_vout->output.i_rrshift,
 431                  p_vout->output.i_rmask );
 432     MaskToShift( &p_vout->output.i_lgshift, &p_vout->output.i_rgshift,
 433                  p_vout->output.i_gmask );
 434     MaskToShift( &p_vout->output.i_lbshift, &p_vout->output.i_rbshift,
 435                  p_vout->output.i_bmask );
 436
 437     /* Check whether we managed to create direct buffers similar to
 438      * the render buffers, ie same size and chroma */
 439     if( ( p_vout->output.i_width == p_vout->render.i_width )
 440      && ( p_vout->output.i_height == p_vout->render.i_height )
 441      && ( vout_ChromaCmp( p_vout->output.i_chroma, p_vout->render.i_chroma ) ) )
 442     {
 443         /* Cool ! We have direct buffers, we can ask the decoder to
 444          * directly decode into them ! Map the first render buffers to
 445          * the first direct buffers, but keep the first direct buffer
 446          * for memcpy operations */
 447         p_vout->b_direct = 1;
 448
 449         for( i = 1; i < VOUT_MAX_PICTURES; i++ )
 450         {
 451             if( p_vout->p_picture[ i ].i_type != DIRECT_PICTURE &&
 452                 I_RENDERPICTURES >= VOUT_MIN_DIRECT_PICTURES - 1 &&
 453                 p_vout->p_picture[ i - 1 ].i_type == DIRECT_PICTURE )
 454             {
 455                 /* We have enough direct buffers so there's no need to
 456                  * try to use system memory buffers. */
 457                 break;
 458             }
 459             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 460             I_RENDERPICTURES++;
 461         }
 462
 463         msg_Dbg( p_vout, "direct render, mapping "
 464                  "render pictures 0-%i to system pictures 1-%i",
 465                  VOUT_MAX_PICTURES - 2, VOUT_MAX_PICTURES - 1 );
 466     }
 467     else
 468     {
 469         /* Rats... Something is wrong here, we could not find an output
 470          * plugin able to directly render what we decode. See if we can
 471          * find a chroma plugin to do the conversion */
 472         p_vout->b_direct = 0;
 473
 474         /* Choose the best module */
 475         p_vout->chroma.p_module = module_Need( p_vout, "chroma", NULL );
 476
 477         if( p_vout->chroma.p_module == NULL )
 478         {
 479             msg_Err( p_vout, "no chroma module for %4.4s to %4.4s",
 480                      &p_vout->render.i_chroma, &p_vout->output.i_chroma );
 481             p_vout->pf_end( p_vout );
 482             vlc_mutex_unlock( &p_vout->change_lock );
 483             return VLC_EGENERIC;
 484         }
 485
 486         msg_Dbg( p_vout, "indirect render, mapping "
 487                  "render pictures 0-%i to system pictures %i-%i",
 488                  VOUT_MAX_PICTURES - 1, I_OUTPUTPICTURES,
 489                  I_OUTPUTPICTURES + VOUT_MAX_PICTURES - 1 );
 490
 491         /* Append render buffers after the direct buffers */
 492         for( i = I_OUTPUTPICTURES; i < 2 * VOUT_MAX_PICTURES; i++ )
 493         {
 494             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 495             I_RENDERPICTURES++;
 496
 497             /* Check if we have enough render pictures */
 498             if( I_RENDERPICTURES == VOUT_MAX_PICTURES )
 499                 break;
 500         }
 501     }
 502
 503     /* Link pictures back to their heap */
 504     for( i = 0 ; i < I_RENDERPICTURES ; i++ )
 505     {
 506         PP_RENDERPICTURE[ i ]->p_heap = &p_vout->render;
 507     }
 508
 509     for( i = 0 ; i < I_OUTPUTPICTURES ; i++ )
 510     {
 511         PP_OUTPUTPICTURE[ i ]->p_heap = &p_vout->output;
 512     }
 513
 514 /* XXX XXX mark thread ready */
 515     return VLC_SUCCESS;
 516 }
 517
 518 /*****************************************************************************
 519  * RunThread: video output thread
 520  *****************************************************************************
 521  * Video output thread. This function does only returns when the thread is
 522  * terminated. It handles the pictures arriving in the video heap and the
 523  * display device events.
 524  *****************************************************************************/
 525 static void RunThread( vout_thread_t *p_vout)
 526 {
 527     int             i_index;                                /* index in heap */
 528     int             i_idle_loops = 0;  /* loops without displaying a picture */
 529     mtime_t         current_date;                            /* current date */
 530     mtime_t         display_date;                            /* display date */
 531
 532     picture_t *     p_picture;                            /* picture pointer */
 533     picture_t *     p_last_picture = NULL;                   /* last picture */
 534     picture_t *     p_directbuffer;              /* direct buffer to display */
 535
 536     subpicture_t *  p_subpic;                          /* subpicture pointer */
 537
 538     /*
 539      * Initialize thread
 540      */
 541     p_vout->b_error = InitThread( p_vout );
 542     if( p_vout->b_error )
 543     {
 544         /* Destroy thread structures allocated by Create and InitThread */
 545         DestroyThread( p_vout );
 546         return;
 547     }
 548
 549     /*
 550      * Main loop - it is not executed if an error occured during
 551      * initialization
 552      */
 553     while( (!p_vout->b_die) && (!p_vout->b_error) )
 554     {
 555         /* Initialize loop variables */
 556         p_picture = NULL;
 557         display_date = 0;
 558         current_date = mdate();
 559
 560 #ifdef STATS
 561         p_vout->c_loops++;
 562         if( !(p_vout->c_loops % VOUT_STATS_NB_LOOPS) )
 563         {
 564             msg_Dbg( p_vout, "picture heap: %d/%d",
 565                      I_RENDERPICTURES, p_vout->i_heap_size );
 566         }
 567 #endif
 568
 569         /*
 570          * Find the picture to display (the one with the earliest date).
 571          * This operation does not need lock, since only READY_PICTUREs
 572          * are handled. */
 573         for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 574         {
 575             if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 576                 && ( (p_picture == NULL) ||
 577                      (PP_RENDERPICTURE[i_index]->date < display_date) ) )
 578             {
 579                 p_picture = PP_RENDERPICTURE[i_index];
 580                 display_date = p_picture->date;
 581             }
 582         }
 583
 584         if( p_picture )
 585         {
 586             /* If we met the last picture, parse again to see whether there is
 587              * a more appropriate one. */
 588             if( p_picture == p_last_picture )
 589             {
 590                 for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 591                 {
 592                     if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 593                         && (PP_RENDERPICTURE[i_index] != p_last_picture)
 594                         && ((p_picture == p_last_picture) ||
 595                             (PP_RENDERPICTURE[i_index]->date < display_date)) )
 596                     {
 597                         p_picture = PP_RENDERPICTURE[i_index];
 598                         display_date = p_picture->date;
 599                     }
 600                 }
 601             }
 602
 603             /* If we found better than the last picture, destroy it */
 604             if( p_last_picture && p_picture != p_last_picture )
 605             {
 606                 vlc_mutex_lock( &p_vout->picture_lock );
 607                 if( p_last_picture->i_refcount )
 608                 {
 609                     p_last_picture->i_status = DISPLAYED_PICTURE;
 610                 }
 611                 else
 612                 {
 613                     p_last_picture->i_status = DESTROYED_PICTURE;
 614                     p_vout->i_heap_size--;
 615                 }
 616                 vlc_mutex_unlock( &p_vout->picture_lock );
 617                 p_last_picture = NULL;
 618             }
 619
 620             /* Compute FPS rate */
 621             p_vout->p_fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ]
 622                 = display_date;
 623
 624             if( !p_picture->b_force &&
 625                 p_picture != p_last_picture &&
 626                 display_date < current_date + p_vout->render_time )
 627             {
 628                 /* Picture is late: it will be destroyed and the thread
 629                  * will directly choose the next picture */
 630                 vlc_mutex_lock( &p_vout->picture_lock );
 631                 if( p_picture->i_refcount )
 632                 {
 633                     /* Pretend we displayed the picture, but don't destroy
 634                      * it since the decoder might still need it. */
 635                     p_picture->i_status = DISPLAYED_PICTURE;
 636                 }
 637                 else
 638                 {
 639                     /* Destroy the picture without displaying it */
 640                     p_picture->i_status = DESTROYED_PICTURE;
 641                     p_vout->i_heap_size--;
 642                 }
 643                 msg_Warn( p_vout, "late picture skipped ("I64Fd")",
 644                                   current_date - display_date );
 645                 vlc_mutex_unlock( &p_vout->picture_lock );
 646
 647                 continue;
 648             }
 649 #if 0
 650             /* Removed because it causes problems for some people --Meuuh */
 651             if( display_date > current_date + VOUT_BOGUS_DELAY )
 652             {
 653                 /* Picture is waaay too early: it will be destroyed */
 654                 vlc_mutex_lock( &p_vout->picture_lock );
 655                 if( p_picture->i_refcount )
 656                 {
 657                     /* Pretend we displayed the picture, but don't destroy
 658                      * it since the decoder might still need it. */
 659                     p_picture->i_status = DISPLAYED_PICTURE;
 660                 }
 661                 else
 662                 {
 663                     /* Destroy the picture without displaying it */
 664                     p_picture->i_status = DESTROYED_PICTURE;
 665                     p_vout->i_heap_size--;
 666                 }
 667                 intf_WarnMsg( 1, "vout warning: early picture skipped "
 668                               "("I64Fd")", display_date - current_date );
 669                 vlc_mutex_unlock( &p_vout->picture_lock );
 670
 671                 continue;
 672             }
 673 #endif
 674             if( display_date > current_date + VOUT_DISPLAY_DELAY )
 675             {
 676                 /* A picture is ready to be rendered, but its rendering date
 677                  * is far from the current one so the thread will perform an
 678                  * empty loop as if no picture were found. The picture state
 679                  * is unchanged */
 680                 p_picture    = NULL;
 681                 display_date = 0;
 682             }
 683             else if( p_picture == p_last_picture )
 684             {
 685                 /* We are asked to repeat the previous picture, but we first
 686                  * wait for a couple of idle loops */
 687                 if( i_idle_loops < 4 )
 688                 {
 689                     p_picture    = NULL;
 690                     display_date = 0;
 691                 }
 692                 else
 693                 {
 694                     /* We set the display date to something high, otherwise
 695                      * we'll have lots of problems with late pictures */
 696                     display_date = current_date + p_vout->render_time;
 697                 }
 698             }
 699         }
 700
 701         if( p_picture == NULL )
 702         {
 703             i_idle_loops++;
 704         }
 705
 706         /*
 707          * Check for subpictures to display
 708          */
 709         p_subpic = vout_SortSubPictures( p_vout, display_date );
 710
 711         /*
 712          * Perform rendering
 713          */
 714         p_directbuffer = vout_RenderPicture( p_vout, p_picture, p_subpic );
 715
 716         /*
 717          * Call the plugin-specific rendering method if there is one
 718          */
 719         if( p_picture != NULL && p_vout->pf_render )
 720         {
 721             /* Render the direct buffer returned by vout_RenderPicture */
 722             p_vout->pf_render( p_vout, p_directbuffer );
 723         }
 724
 725         /*
 726          * Sleep, wake up
 727          */
 728         if( display_date != 0 )
 729         {
 730             /* Store render time using a sliding mean */
 731             p_vout->render_time += mdate() - current_date;
 732             p_vout->render_time >>= 1;
 733         }
 734
 735         /* Give back change lock */
 736         vlc_mutex_unlock( &p_vout->change_lock );
 737
 738         /* Sleep a while or until a given date */
 739         if( display_date != 0 )
 740         {
 741             mwait( display_date - VOUT_MWAIT_TOLERANCE );
 742         }
 743         else
 744         {
 745             msleep( VOUT_IDLE_SLEEP );
 746         }
 747
 748         /* On awakening, take back lock and send immediately picture
 749          * to display. */
 750         vlc_mutex_lock( &p_vout->change_lock );
 751
 752         /*
 753          * Display the previously rendered picture
 754          */
 755         if( p_picture != NULL )
 756         {
 757             /* Display the direct buffer returned by vout_RenderPicture */
 758             if( p_vout->pf_display )
 759             {
 760                 p_vout->pf_display( p_vout, p_directbuffer );
 761             }
 762
 763             /* Reinitialize idle loop count */
 764             i_idle_loops = 0;
 765
 766             /* Tell the vout this was the last picture and that it does not
 767              * need to be forced anymore. */
 768             p_last_picture = p_picture;
 769             p_last_picture->b_force = 0;
 770         }
 771
 772         /*
 773          * Check events and manage thread
 774          */
 775         if( p_vout->pf_manage && p_vout->pf_manage( p_vout ) )
 776         {
 777             /* A fatal error occured, and the thread must terminate
 778              * immediately, without displaying anything - setting b_error to 1
 779              * causes the immediate end of the main while() loop. */
 780             p_vout->b_error = 1;
 781         }
 782
 783         if( p_vout->i_changes & VOUT_SIZE_CHANGE )
 784         {
 785             /* this must only happen when the vout plugin is incapable of
 786              * rescaling the picture itself. In this case we need to destroy
 787              * the current picture buffers and recreate new ones with the right
 788              * dimensions */
 789             int i;
 790
 791             p_vout->i_changes &= ~VOUT_SIZE_CHANGE;
 792
 793             p_vout->pf_end( p_vout );
 794             for( i = 0; i < I_OUTPUTPICTURES; i++ )
 795                  p_vout->p_picture[ i ].i_status = FREE_PICTURE;
 796
 797             I_OUTPUTPICTURES = 0;
 798             if( p_vout->pf_init( p_vout ) )
 799             {
 800                 msg_Err( p_vout, "cannot resize display" );
 801                 /* FIXME: pf_end will be called again in EndThread() */
 802                 p_vout->b_error = 1;
 803             }
 804
 805             /* Need to reinitialise the chroma plugin */
 806             p_vout->chroma.p_module->pf_deactivate( VLC_OBJECT(p_vout) );
 807             p_vout->chroma.p_module->pf_activate( VLC_OBJECT(p_vout) );
 808         }
 809     }
 810
 811     /*
 812      * Error loop - wait until the thread destruction is requested
 813      */
 814     if( p_vout->b_error )
 815     {
 816         ErrorThread( p_vout );
 817     }
 818
 819     /* End of thread */
 820     EndThread( p_vout );
 821
 822     /* Destroy thread structures allocated by CreateThread */
 823     DestroyThread( p_vout );
 824 }
 825
 826 /*****************************************************************************
 827  * ErrorThread: RunThread() error loop
 828  *****************************************************************************
 829  * This function is called when an error occured during thread main's loop. The
 830  * thread can still receive feed, but must be ready to terminate as soon as
 831  * possible.
 832  *****************************************************************************/
 833 static void ErrorThread( vout_thread_t *p_vout )
 834 {
 835     /* Wait until a `die' order */
 836     while( !p_vout->b_die )
 837     {
 838         /* Sleep a while */
 839         msleep( VOUT_IDLE_SLEEP );
 840     }
 841 }
 842
 843 /*****************************************************************************
 844  * EndThread: thread destruction
 845  *****************************************************************************
 846  * This function is called when the thread ends after a sucessful
 847  * initialization. It frees all ressources allocated by InitThread.
 848  *****************************************************************************/
 849 static void EndThread( vout_thread_t *p_vout )
 850 {
 851     int     i_index;                                        /* index in heap */
 852
 853 #ifdef STATS
 854     {
 855         struct tms cpu_usage;
 856         times( &cpu_usage );
 857
 858         msg_Dbg( p_vout, "cpu usage (user: %d, system: %d)",
 859                  cpu_usage.tms_utime, cpu_usage.tms_stime );
 860     }
 861 #endif
 862
 863     if( !p_vout->b_direct )
 864     {
 865         module_Unneed( p_vout, p_vout->chroma.p_module );
 866     }
 867
 868     /* Destroy all remaining pictures */
 869     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++ )
 870     {
 871         if ( p_vout->p_picture[i_index].i_type == MEMORY_PICTURE )
 872         {
 873             free( p_vout->p_picture[i_index].p_data_orig );
 874         }
 875     }
 876
 877     /* Destroy all remaining subpictures */
 878     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++ )
 879     {
 880         if( p_vout->p_subpicture[i_index].i_status != FREE_SUBPICTURE )
 881         {
 882             free( p_vout->p_subpicture[i_index].p_sys );
 883         }
 884     }
 885
 886     /* Destroy translation tables */
 887     p_vout->pf_end( p_vout );
 888
 889     /* Release the change lock */
 890     vlc_mutex_unlock( &p_vout->change_lock );
 891 }
 892
 893 /*****************************************************************************
 894  * DestroyThread: thread destruction
 895  *****************************************************************************
 896  * This function is called when the thread ends. It frees all ressources
 897  * allocated by CreateThread. Status is available at this stage.
 898  *****************************************************************************/
 899 static void DestroyThread( vout_thread_t *p_vout )
 900 {
 901     /* Destroy the locks */
 902     vlc_mutex_destroy( &p_vout->picture_lock );
 903     vlc_mutex_destroy( &p_vout->subpicture_lock );
 904     vlc_mutex_destroy( &p_vout->change_lock );
 905
 906     /* Release the module */
 907     module_Unneed( p_vout, p_vout->p_module );
 908 }
 909
 910 /* following functions are local */
 911
 912 static int ReduceHeight( int i_ratio )
 913 {
 914     int i_dummy = VOUT_ASPECT_FACTOR;
 915     int i_pgcd  = 1;
 916
 917     if( !i_ratio )
 918     {
 919         return i_pgcd;
 920     }
 921
 922     /* VOUT_ASPECT_FACTOR is (2^7 * 3^3 * 5^3), we just check for 2, 3 and 5 */
 923     while( !(i_ratio & 1) && !(i_dummy & 1) )
 924     {
 925         i_ratio >>= 1;
 926         i_dummy >>= 1;
 927         i_pgcd  <<= 1;
 928     }
 929
 930     while( !(i_ratio % 3) && !(i_dummy % 3) )
 931     {
 932         i_ratio /= 3;
 933         i_dummy /= 3;
 934         i_pgcd  *= 3;
 935     }
 936
 937     while( !(i_ratio % 5) && !(i_dummy % 5) )
 938     {
 939         i_ratio /= 5;
 940         i_dummy /= 5;
 941         i_pgcd  *= 5;
 942     }
 943
 944     return i_pgcd;
 945 }
 946
 947 /*****************************************************************************
 948  * BinaryLog: computes the base 2 log of a binary value
 949  *****************************************************************************
 950  * This functions is used by MaskToShift, to get a bit index from a binary
 951  * value.
 952  *****************************************************************************/
 953 static int BinaryLog( uint32_t i )
 954 {
 955     int i_log = 0;
 956
 957     if( i == 0 ) return -31337;
 958
 959     if( i & 0xffff0000 ) i_log += 16;
 960     if( i & 0xff00ff00 ) i_log += 8;
 961     if( i & 0xf0f0f0f0 ) i_log += 4;
 962     if( i & 0xcccccccc ) i_log += 2;
 963     if( i & 0xaaaaaaaa ) i_log += 1;
 964
 965     return i_log;
 966 }
 967
 968 /*****************************************************************************
 969  * MaskToShift: transform a color mask into right and left shifts
 970  *****************************************************************************
 971  * This function is used for obtaining color shifts from masks.
 972  *****************************************************************************/
 973 static void MaskToShift( int *pi_left, int *pi_right, uint32_t i_mask )
 974 {
 975     uint32_t i_low, i_high;            /* lower hand higher bits of the mask */
 976
 977     if( !i_mask )
 978     {
 979         *pi_left = *pi_right = 0;
 980         return;
 981     }
 982
 983     /* Get bits */
 984     i_low =  i_mask & (- (int32_t)i_mask);          /* lower bit of the mask */
 985     i_high = i_mask + i_low;                       /* higher bit of the mask */
 986
 987     /* Transform bits into an index */
 988     i_low =  BinaryLog (i_low);
 989     i_high = BinaryLog (i_high);
 990
 991     /* Update pointers and return */
 992     *pi_left =   i_low;
 993     *pi_right = (8 - i_high + i_low);
 994 }
 995
 996 /*****************************************************************************
 997  * InitWindowSize: find the initial dimensions the video window should have.
 998  *****************************************************************************
 999  * This function will check the "width", "height" and "zoom" config options and
1000  * will calculate the size that the video window should have.
1001  *****************************************************************************/
1002 static void InitWindowSize( vout_thread_t *p_vout, int *pi_width,
1003                             int *pi_height )
1004 {
1005     int i_width, i_height;
1006     uint64_t ll_zoom;
1007
1008 #define FP_FACTOR 1000                             /* our fixed point factor */
1009
1010     i_width = config_GetInt( p_vout, "width" );
1011     i_height = config_GetInt( p_vout, "height" );
1012     ll_zoom = (uint64_t)( FP_FACTOR * config_GetFloat( p_vout, "zoom" ) );
1013
1014     if( (i_width >= 0) && (i_height >= 0))
1015     {
1016         *pi_width = (int)( i_width * ll_zoom / FP_FACTOR );
1017         *pi_height = (int)( i_height * ll_zoom / FP_FACTOR );
1018         return;
1019     }
1020     else if( i_width >= 0 )
1021     {
1022         *pi_width = (int)( i_width * ll_zoom / FP_FACTOR );
1023         *pi_height = (int)( i_width * ll_zoom * VOUT_ASPECT_FACTOR /
1024                             p_vout->render.i_aspect / FP_FACTOR );
1025         return;
1026     }
1027     else if( i_height >= 0 )
1028     {
1029         *pi_height = (int)( i_height * ll_zoom / FP_FACTOR );
1030         *pi_width = (int)( i_height * ll_zoom * p_vout->render.i_aspect /
1031                            VOUT_ASPECT_FACTOR / FP_FACTOR );
1032         return;
1033     }
1034
1035     if( p_vout->render.i_height * p_vout->render.i_aspect
1036         >= p_vout->render.i_width * VOUT_ASPECT_FACTOR )
1037     {
1038         *pi_width = (int)( p_vout->render.i_height * ll_zoom
1039           * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR / FP_FACTOR );
1040         *pi_height = (int)( p_vout->render.i_height * ll_zoom / FP_FACTOR );
1041     }
1042     else
1043     {
1044         *pi_width = (int)( p_vout->render.i_width * ll_zoom / FP_FACTOR );
1045         *pi_height = (int)( p_vout->render.i_width * ll_zoom
1046           * VOUT_ASPECT_FACTOR / p_vout->render.i_aspect / FP_FACTOR );
1047     }
1048
1049 #undef FP_FACTOR
1050 }
1051
1052 /*****************************************************************************
1053  * vout_VarCallback: generic callback for intf variables
1054  *****************************************************************************/
1055 int vout_VarCallback( vlc_object_t * p_this, const char * psz_variable,
1056                       vlc_value_t old_value, vlc_value_t new_value,
1057                       void * unused )
1058 {
1059     vout_thread_t * p_vout = (vout_thread_t *)p_this;
1060     vlc_value_t val;
1061     val.b_bool = 1;
1062     var_Set( p_vout, "intf-change", val );
1063     return 0;
1064 }