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 1.207 2003/01/22 10:44:50 fenrir 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             char *psz_sout = config_GetPsz( p_this, "sout" );
  75
  76             if( !psz_sout || !*psz_sout )
  77             {
  78                 vlc_object_detach( p_vout );
  79                 vlc_object_attach( p_vout, p_this->p_vlc );
  80             }
  81             else
  82             {
  83                 vlc_object_detach( p_vout );
  84 //                vlc_object_release( p_vout );
  85                 vout_Destroy( p_vout );
  86             }
  87             if( psz_sout ) free( psz_sout );
  88         }
  89
  90         return NULL;
  91     }
  92
  93     /* If a video output was provided, lock it, otherwise look for one. */
  94     if( p_vout )
  95     {
  96         vlc_object_yield( p_vout );
  97     }
  98     else
  99     {
 100         p_vout = vlc_object_find( p_this, VLC_OBJECT_VOUT, FIND_CHILD );
 101
 102         if( !p_vout )
 103         {
 104             p_vout = vlc_object_find( p_this, VLC_OBJECT_VOUT, FIND_ANYWHERE );
 105         }
 106     }
 107
 108     /* If we now have a video output, check it has the right properties */
 109     if( p_vout )
 110     {
 111         if( ( p_vout->render.i_width != i_width ) ||
 112             ( p_vout->render.i_height != i_height ) ||
 113             ( p_vout->render.i_chroma != i_chroma ) ||
 114             ( p_vout->render.i_aspect != i_aspect ) )
 115         {
 116             /* We are not interested in this format, close this vout */
 117             vlc_object_detach( p_vout );
 118             vlc_object_release( p_vout );
 119             vout_Destroy( p_vout );
 120             p_vout = NULL;
 121         }
 122         else
 123         {
 124             /* This video output is cool! Hijack it. */
 125             vlc_object_detach( p_vout );
 126             vlc_object_attach( p_vout, p_this );
 127             vlc_object_release( p_vout );
 128         }
 129     }
 130
 131     if( !p_vout )
 132     {
 133         msg_Dbg( p_this, "no usable vout present, spawning one" );
 134
 135         p_vout = vout_Create( p_this, i_width, i_height, i_chroma, i_aspect );
 136     }
 137
 138     return p_vout;
 139 }
 140
 141 /*****************************************************************************
 142  * vout_Create: creates a new video output thread
 143  *****************************************************************************
 144  * This function creates a new video output thread, and returns a pointer
 145  * to its description. On error, it returns NULL.
 146  *****************************************************************************/
 147 vout_thread_t * __vout_Create( vlc_object_t *p_parent,
 148                                unsigned int i_width, unsigned int i_height,
 149                                vlc_fourcc_t i_chroma, unsigned int i_aspect )
 150 {
 151     vout_thread_t * p_vout;                             /* thread descriptor */
 152     int             i_index;                                /* loop variable */
 153     char          * psz_plugin;
 154     vlc_value_t     val;
 155
 156     /* Allocate descriptor */
 157     p_vout = vlc_object_create( p_parent, VLC_OBJECT_VOUT );
 158     if( p_vout == NULL )
 159     {
 160         msg_Err( p_parent, "out of memory" );
 161         return NULL;
 162     }
 163
 164     var_Create( p_vout, "intf-change", VLC_VAR_BOOL );
 165     val.b_bool = VLC_TRUE;
 166     var_Set( p_vout, "intf-change", val );
 167
 168     /* If the parent is not a VOUT object, that means we are at the start of
 169      * the video output pipe */
 170     if( p_parent->i_object_type != VLC_OBJECT_VOUT )
 171     {
 172         char *psz_aspect = config_GetPsz( p_parent, "aspect-ratio" );
 173
 174         /* Check whether the user tried to override aspect ratio */
 175         if( psz_aspect )
 176         {
 177             unsigned int i_new_aspect = i_aspect;
 178             char *psz_parser = strchr( psz_aspect, ':' );
 179
 180             if( psz_parser )
 181             {
 182                 *psz_parser++ = '\0';
 183                 i_new_aspect = atoi( psz_aspect ) * VOUT_ASPECT_FACTOR
 184                                                   / atoi( psz_parser );
 185             }
 186             else
 187             {
 188                 i_new_aspect = i_width * VOUT_ASPECT_FACTOR
 189                                        * atof( psz_aspect )
 190                                        / i_height;
 191             }
 192
 193             free( psz_aspect );
 194
 195             if( i_new_aspect && i_new_aspect != i_aspect )
 196             {
 197                 int i_pgcd = ReduceHeight( i_new_aspect );
 198
 199                 msg_Dbg( p_vout, "overriding source aspect ratio to %i:%i",
 200                          i_new_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 201
 202                 i_aspect = i_new_aspect;
 203             }
 204         }
 205
 206         /* Look for the default filter configuration */
 207         p_vout->psz_filter_chain = config_GetPsz( p_parent, "filter" );
 208     }
 209     else
 210     {
 211         /* continue the parent's filter chain */
 212         char *psz_end;
 213
 214         psz_end = strchr( ((vout_thread_t *)p_parent)->psz_filter_chain, ':' );
 215         if( psz_end && *(psz_end+1) )
 216             p_vout->psz_filter_chain = strdup( psz_end+1 );
 217         else p_vout->psz_filter_chain = NULL;
 218     }
 219
 220     /* Choose the video output module */
 221     if( !p_vout->psz_filter_chain )
 222     {
 223         psz_plugin = config_GetPsz( p_parent, "vout" );
 224     }
 225     else
 226     {
 227         /* the filter chain is a string list of filters separated by double
 228          * colons */
 229         char *psz_end;
 230
 231         psz_end = strchr( p_vout->psz_filter_chain, ':' );
 232         if( psz_end )
 233             psz_plugin = strndup( p_vout->psz_filter_chain,
 234                                   psz_end - p_vout->psz_filter_chain );
 235         else psz_plugin = strdup( p_vout->psz_filter_chain );
 236     }
 237
 238     /* Initialize pictures and subpictures - translation tables and functions
 239      * will be initialized later in InitThread */
 240     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++)
 241     {
 242         p_vout->p_picture[i_index].i_status = FREE_PICTURE;
 243         p_vout->p_picture[i_index].i_type   = EMPTY_PICTURE;
 244     }
 245
 246     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++)
 247     {
 248         p_vout->p_subpicture[i_index].i_status = FREE_SUBPICTURE;
 249         p_vout->p_subpicture[i_index].i_type   = EMPTY_SUBPICTURE;
 250     }
 251
 252     /* No images in the heap */
 253     p_vout->i_heap_size = 0;
 254
 255     /* Initialize the rendering heap */
 256     I_RENDERPICTURES = 0;
 257     p_vout->render.i_width    = i_width;
 258     p_vout->render.i_height   = i_height;
 259     p_vout->render.i_chroma   = i_chroma;
 260     p_vout->render.i_aspect   = i_aspect;
 261
 262     p_vout->render.i_rmask    = 0;
 263     p_vout->render.i_gmask    = 0;
 264     p_vout->render.i_bmask    = 0;
 265
 266     p_vout->render.i_last_used_pic = -1;
 267     p_vout->render.b_allow_modify_pics = 1;
 268
 269     /* Zero the output heap */
 270     I_OUTPUTPICTURES = 0;
 271     p_vout->output.i_width    = 0;
 272     p_vout->output.i_height   = 0;
 273     p_vout->output.i_chroma   = 0;
 274     p_vout->output.i_aspect   = 0;
 275
 276     p_vout->output.i_rmask    = 0;
 277     p_vout->output.i_gmask    = 0;
 278     p_vout->output.i_bmask    = 0;
 279
 280     /* Initialize misc stuff */
 281     p_vout->i_changes    = 0;
 282     p_vout->f_gamma      = 0;
 283     p_vout->b_grayscale  = 0;
 284     p_vout->b_info       = 0;
 285     p_vout->b_interface  = 0;
 286     p_vout->b_scale      = 1;
 287     p_vout->b_fullscreen = 0;
 288     p_vout->render_time  = 10;
 289     p_vout->c_fps_samples= 0;
 290
 291     /* Mouse coordinates */
 292     var_Create( p_vout, "mouse-x", VLC_VAR_INTEGER );
 293     var_Create( p_vout, "mouse-y", VLC_VAR_INTEGER );
 294     var_Create( p_vout, "mouse-moved", VLC_VAR_BOOL );
 295     var_Create( p_vout, "mouse-clicked", VLC_VAR_INTEGER );
 296     var_Create( p_vout, "key-pressed", VLC_VAR_STRING );
 297
 298     /* user requested fullscreen? */
 299     if( config_GetInt( p_vout, "fullscreen" ) )
 300     {
 301         p_vout->i_changes |= VOUT_FULLSCREEN_CHANGE;
 302     }
 303
 304     /* Initialize the dimensions of the video window */
 305     InitWindowSize( p_vout, &p_vout->i_window_width,
 306                     &p_vout->i_window_height );
 307
 308
 309     p_vout->p_module = module_Need( p_vout,
 310                            ( p_vout->psz_filter_chain ) ?
 311                            "video filter" : "video output",
 312                            psz_plugin );
 313
 314     if( psz_plugin ) free( psz_plugin );
 315     if( p_vout->p_module == NULL )
 316     {
 317         msg_Err( p_vout, "no suitable vout module" );
 318         vlc_object_destroy( p_vout );
 319         return NULL;
 320     }
 321
 322     /* Create thread and set locks */
 323     vlc_mutex_init( p_vout, &p_vout->picture_lock );
 324     vlc_mutex_init( p_vout, &p_vout->subpicture_lock );
 325     vlc_mutex_init( p_vout, &p_vout->change_lock );
 326
 327     vlc_object_attach( p_vout, p_parent );
 328
 329     if( vlc_thread_create( p_vout, "video output", RunThread,
 330                            VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
 331     {
 332         msg_Err( p_vout, "out of memory" );
 333         module_Unneed( p_vout, p_vout->p_module );
 334         vlc_object_destroy( p_vout );
 335         return NULL;
 336     }
 337
 338     return p_vout;
 339 }
 340
 341 /*****************************************************************************
 342  * vout_Destroy: destroys a previously created video output
 343  *****************************************************************************
 344  * Destroy a terminated thread.
 345  * The function will request a destruction of the specified thread. If pi_error
 346  * is NULL, it will return once the thread is destroyed. Else, it will be
 347  * update using one of the THREAD_* constants.
 348  *****************************************************************************/
 349 void vout_Destroy( vout_thread_t *p_vout )
 350 {
 351     /* Request thread destruction */
 352     p_vout->b_die = VLC_TRUE;
 353     vlc_thread_join( p_vout );
 354
 355     var_Destroy( p_vout, "intf-change" );
 356
 357     /* Free structure */
 358     vlc_object_destroy( p_vout );
 359 }
 360
 361 /*****************************************************************************
 362  * InitThread: initialize video output thread
 363  *****************************************************************************
 364  * This function is called from RunThread and performs the second step of the
 365  * initialization. It returns 0 on success. Note that the thread's flag are not
 366  * modified inside this function.
 367  *****************************************************************************/
 368 static int InitThread( vout_thread_t *p_vout )
 369 {
 370     int i, i_pgcd;
 371
 372     vlc_mutex_lock( &p_vout->change_lock );
 373
 374 #ifdef STATS
 375     p_vout->c_loops = 0;
 376 #endif
 377
 378     /* Initialize output method, it allocates direct buffers for us */
 379     if( p_vout->pf_init( p_vout ) )
 380     {
 381         vlc_mutex_unlock( &p_vout->change_lock );
 382         return VLC_EGENERIC;
 383     }
 384
 385     if( !I_OUTPUTPICTURES )
 386     {
 387         msg_Err( p_vout, "plugin was unable to allocate at least "
 388                          "one direct buffer" );
 389         p_vout->pf_end( p_vout );
 390         vlc_mutex_unlock( &p_vout->change_lock );
 391         return VLC_EGENERIC;
 392     }
 393
 394     if( I_OUTPUTPICTURES > VOUT_MAX_PICTURES )
 395     {
 396         msg_Err( p_vout, "plugin allocated too many direct buffers, "
 397                          "our internal buffers must have overflown." );
 398         p_vout->pf_end( p_vout );
 399         vlc_mutex_unlock( &p_vout->change_lock );
 400         return VLC_EGENERIC;
 401     }
 402
 403     msg_Dbg( p_vout, "got %i direct buffer(s)", I_OUTPUTPICTURES );
 404
 405 #if 0
 406     if( !p_vout->psz_filter_chain )
 407     {
 408         char *psz_aspect = config_GetPsz( p_vout, "pixel-ratio" );
 409
 410         if( psz_aspect )
 411         {
 412             int i_new_aspect = p_vout->output.i_width * VOUT_ASPECT_FACTOR
 413                                                       * atof( psz_aspect )
 414                                                       / p_vout->output.i_height;
 415             free( psz_aspect );
 416
 417             if( i_new_aspect && i_new_aspect != p_vout->output.i_aspect )
 418             {
 419                 int i_pgcd = ReduceHeight( i_new_aspect );
 420                 msg_Dbg( p_vout, "output ratio forced to %i:%i\n",
 421                          i_new_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 422                 p_vout->output.i_aspect = i_new_aspect;
 423             }
 424         }
 425     }
 426 #endif
 427
 428     i_pgcd = ReduceHeight( p_vout->render.i_aspect );
 429     msg_Dbg( p_vout,
 430              "picture in %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 431              p_vout->render.i_width, p_vout->render.i_height,
 432              p_vout->render.i_chroma, (char*)&p_vout->render.i_chroma,
 433              p_vout->render.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 434
 435     i_pgcd = ReduceHeight( p_vout->output.i_aspect );
 436     msg_Dbg( p_vout,
 437              "picture out %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 438              p_vout->output.i_width, p_vout->output.i_height,
 439              p_vout->output.i_chroma, (char*)&p_vout->output.i_chroma,
 440              p_vout->output.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 441
 442     /* Calculate shifts from system-updated masks */
 443     MaskToShift( &p_vout->output.i_lrshift, &p_vout->output.i_rrshift,
 444                  p_vout->output.i_rmask );
 445     MaskToShift( &p_vout->output.i_lgshift, &p_vout->output.i_rgshift,
 446                  p_vout->output.i_gmask );
 447     MaskToShift( &p_vout->output.i_lbshift, &p_vout->output.i_rbshift,
 448                  p_vout->output.i_bmask );
 449
 450     /* Check whether we managed to create direct buffers similar to
 451      * the render buffers, ie same size and chroma */
 452     if( ( p_vout->output.i_width == p_vout->render.i_width )
 453      && ( p_vout->output.i_height == p_vout->render.i_height )
 454      && ( vout_ChromaCmp( p_vout->output.i_chroma, p_vout->render.i_chroma ) ) )
 455     {
 456         /* Cool ! We have direct buffers, we can ask the decoder to
 457          * directly decode into them ! Map the first render buffers to
 458          * the first direct buffers, but keep the first direct buffer
 459          * for memcpy operations */
 460         p_vout->b_direct = 1;
 461
 462         for( i = 1; i < VOUT_MAX_PICTURES; i++ )
 463         {
 464             if( p_vout->p_picture[ i ].i_type != DIRECT_PICTURE &&
 465                 I_RENDERPICTURES >= VOUT_MIN_DIRECT_PICTURES - 1 &&
 466                 p_vout->p_picture[ i - 1 ].i_type == DIRECT_PICTURE )
 467             {
 468                 /* We have enough direct buffers so there's no need to
 469                  * try to use system memory buffers. */
 470                 break;
 471             }
 472             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 473             I_RENDERPICTURES++;
 474         }
 475
 476         msg_Dbg( p_vout, "direct render, mapping "
 477                  "render pictures 0-%i to system pictures 1-%i",
 478                  VOUT_MAX_PICTURES - 2, VOUT_MAX_PICTURES - 1 );
 479     }
 480     else
 481     {
 482         /* Rats... Something is wrong here, we could not find an output
 483          * plugin able to directly render what we decode. See if we can
 484          * find a chroma plugin to do the conversion */
 485         p_vout->b_direct = 0;
 486
 487         /* Choose the best module */
 488         p_vout->chroma.p_module = module_Need( p_vout, "chroma", NULL );
 489
 490         if( p_vout->chroma.p_module == NULL )
 491         {
 492             msg_Err( p_vout, "no chroma module for %4.4s to %4.4s",
 493                      (char*)&p_vout->render.i_chroma,
 494                      (char*)&p_vout->output.i_chroma );
 495             p_vout->pf_end( p_vout );
 496             vlc_mutex_unlock( &p_vout->change_lock );
 497             return VLC_EGENERIC;
 498         }
 499
 500         msg_Dbg( p_vout, "indirect render, mapping "
 501                  "render pictures 0-%i to system pictures %i-%i",
 502                  VOUT_MAX_PICTURES - 1, I_OUTPUTPICTURES,
 503                  I_OUTPUTPICTURES + VOUT_MAX_PICTURES - 1 );
 504
 505         /* Append render buffers after the direct buffers */
 506         for( i = I_OUTPUTPICTURES; i < 2 * VOUT_MAX_PICTURES; i++ )
 507         {
 508             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 509             I_RENDERPICTURES++;
 510
 511             /* Check if we have enough render pictures */
 512             if( I_RENDERPICTURES == VOUT_MAX_PICTURES )
 513                 break;
 514         }
 515     }
 516
 517     /* Link pictures back to their heap */
 518     for( i = 0 ; i < I_RENDERPICTURES ; i++ )
 519     {
 520         PP_RENDERPICTURE[ i ]->p_heap = &p_vout->render;
 521     }
 522
 523     for( i = 0 ; i < I_OUTPUTPICTURES ; i++ )
 524     {
 525         PP_OUTPUTPICTURE[ i ]->p_heap = &p_vout->output;
 526     }
 527
 528 /* XXX XXX mark thread ready */
 529     return VLC_SUCCESS;
 530 }
 531
 532 /*****************************************************************************
 533  * RunThread: video output thread
 534  *****************************************************************************
 535  * Video output thread. This function does only returns when the thread is
 536  * terminated. It handles the pictures arriving in the video heap and the
 537  * display device events.
 538  *****************************************************************************/
 539 static void RunThread( vout_thread_t *p_vout)
 540 {
 541     int             i_index;                                /* index in heap */
 542     int             i_idle_loops = 0;  /* loops without displaying a picture */
 543     mtime_t         current_date;                            /* current date */
 544     mtime_t         display_date;                            /* display date */
 545
 546     picture_t *     p_picture;                            /* picture pointer */
 547     picture_t *     p_last_picture = NULL;                   /* last picture */
 548     picture_t *     p_directbuffer;              /* direct buffer to display */
 549
 550     subpicture_t *  p_subpic;                          /* subpicture pointer */
 551
 552     /*
 553      * Initialize thread
 554      */
 555     p_vout->b_error = InitThread( p_vout );
 556     if( p_vout->b_error )
 557     {
 558         /* Destroy thread structures allocated by Create and InitThread */
 559         DestroyThread( p_vout );
 560         return;
 561     }
 562
 563     /*
 564      * Main loop - it is not executed if an error occured during
 565      * initialization
 566      */
 567     while( (!p_vout->b_die) && (!p_vout->b_error) )
 568     {
 569         /* Initialize loop variables */
 570         p_picture = NULL;
 571         display_date = 0;
 572         current_date = mdate();
 573
 574 #ifdef STATS
 575         p_vout->c_loops++;
 576         if( !(p_vout->c_loops % VOUT_STATS_NB_LOOPS) )
 577         {
 578             msg_Dbg( p_vout, "picture heap: %d/%d",
 579                      I_RENDERPICTURES, p_vout->i_heap_size );
 580         }
 581 #endif
 582
 583         /*
 584          * Find the picture to display (the one with the earliest date).
 585          * This operation does not need lock, since only READY_PICTUREs
 586          * are handled. */
 587         for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 588         {
 589             if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 590                 && ( (p_picture == NULL) ||
 591                      (PP_RENDERPICTURE[i_index]->date < display_date) ) )
 592             {
 593                 p_picture = PP_RENDERPICTURE[i_index];
 594                 display_date = p_picture->date;
 595             }
 596         }
 597
 598         if( p_picture )
 599         {
 600             /* If we met the last picture, parse again to see whether there is
 601              * a more appropriate one. */
 602             if( p_picture == p_last_picture )
 603             {
 604                 for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 605                 {
 606                     if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 607                         && (PP_RENDERPICTURE[i_index] != p_last_picture)
 608                         && ((p_picture == p_last_picture) ||
 609                             (PP_RENDERPICTURE[i_index]->date < display_date)) )
 610                     {
 611                         p_picture = PP_RENDERPICTURE[i_index];
 612                         display_date = p_picture->date;
 613                     }
 614                 }
 615             }
 616
 617             /* If we found better than the last picture, destroy it */
 618             if( p_last_picture && p_picture != p_last_picture )
 619             {
 620                 vlc_mutex_lock( &p_vout->picture_lock );
 621                 if( p_last_picture->i_refcount )
 622                 {
 623                     p_last_picture->i_status = DISPLAYED_PICTURE;
 624                 }
 625                 else
 626                 {
 627                     p_last_picture->i_status = DESTROYED_PICTURE;
 628                     p_vout->i_heap_size--;
 629                 }
 630                 vlc_mutex_unlock( &p_vout->picture_lock );
 631                 p_last_picture = NULL;
 632             }
 633
 634             /* Compute FPS rate */
 635             p_vout->p_fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ]
 636                 = display_date;
 637
 638             if( !p_picture->b_force &&
 639                 p_picture != p_last_picture &&
 640                 display_date < current_date + p_vout->render_time )
 641             {
 642                 /* Picture is late: it will be destroyed and the thread
 643                  * will directly choose the next picture */
 644                 vlc_mutex_lock( &p_vout->picture_lock );
 645                 if( p_picture->i_refcount )
 646                 {
 647                     /* Pretend we displayed the picture, but don't destroy
 648                      * it since the decoder might still need it. */
 649                     p_picture->i_status = DISPLAYED_PICTURE;
 650                 }
 651                 else
 652                 {
 653                     /* Destroy the picture without displaying it */
 654                     p_picture->i_status = DESTROYED_PICTURE;
 655                     p_vout->i_heap_size--;
 656                 }
 657                 msg_Warn( p_vout, "late picture skipped ("I64Fd")",
 658                                   current_date - display_date );
 659                 vlc_mutex_unlock( &p_vout->picture_lock );
 660
 661                 continue;
 662             }
 663 #if 0
 664             /* Removed because it causes problems for some people --Meuuh */
 665             if( display_date > current_date + VOUT_BOGUS_DELAY )
 666             {
 667                 /* Picture is waaay too early: it will be destroyed */
 668                 vlc_mutex_lock( &p_vout->picture_lock );
 669                 if( p_picture->i_refcount )
 670                 {
 671                     /* Pretend we displayed the picture, but don't destroy
 672                      * it since the decoder might still need it. */
 673                     p_picture->i_status = DISPLAYED_PICTURE;
 674                 }
 675                 else
 676                 {
 677                     /* Destroy the picture without displaying it */
 678                     p_picture->i_status = DESTROYED_PICTURE;
 679                     p_vout->i_heap_size--;
 680                 }
 681                 intf_WarnMsg( 1, "vout warning: early picture skipped "
 682                               "("I64Fd")", display_date - current_date );
 683                 vlc_mutex_unlock( &p_vout->picture_lock );
 684
 685                 continue;
 686             }
 687 #endif
 688             if( display_date > current_date + VOUT_DISPLAY_DELAY )
 689             {
 690                 /* A picture is ready to be rendered, but its rendering date
 691                  * is far from the current one so the thread will perform an
 692                  * empty loop as if no picture were found. The picture state
 693                  * is unchanged */
 694                 p_picture    = NULL;
 695                 display_date = 0;
 696             }
 697             else if( p_picture == p_last_picture )
 698             {
 699                 /* We are asked to repeat the previous picture, but we first
 700                  * wait for a couple of idle loops */
 701                 if( i_idle_loops < 4 )
 702                 {
 703                     p_picture    = NULL;
 704                     display_date = 0;
 705                 }
 706                 else
 707                 {
 708                     /* We set the display date to something high, otherwise
 709                      * we'll have lots of problems with late pictures */
 710                     display_date = current_date + p_vout->render_time;
 711                 }
 712             }
 713         }
 714
 715         if( p_picture == NULL )
 716         {
 717             i_idle_loops++;
 718         }
 719
 720         /*
 721          * Check for subpictures to display
 722          */
 723         p_subpic = vout_SortSubPictures( p_vout, display_date );
 724
 725         /*
 726          * Perform rendering
 727          */
 728         p_directbuffer = vout_RenderPicture( p_vout, p_picture, p_subpic );
 729
 730         /*
 731          * Call the plugin-specific rendering method if there is one
 732          */
 733         if( p_picture != NULL && p_vout->pf_render )
 734         {
 735             /* Render the direct buffer returned by vout_RenderPicture */
 736             p_vout->pf_render( p_vout, p_directbuffer );
 737         }
 738
 739         /*
 740          * Sleep, wake up
 741          */
 742         if( display_date != 0 )
 743         {
 744             /* Store render time using a sliding mean */
 745             p_vout->render_time += mdate() - current_date;
 746             p_vout->render_time >>= 1;
 747         }
 748
 749         /* Give back change lock */
 750         vlc_mutex_unlock( &p_vout->change_lock );
 751
 752         /* Sleep a while or until a given date */
 753         if( display_date != 0 )
 754         {
 755             mwait( display_date - VOUT_MWAIT_TOLERANCE );
 756         }
 757         else
 758         {
 759             msleep( VOUT_IDLE_SLEEP );
 760         }
 761
 762         /* On awakening, take back lock and send immediately picture
 763          * to display. */
 764         vlc_mutex_lock( &p_vout->change_lock );
 765
 766         /*
 767          * Display the previously rendered picture
 768          */
 769         if( p_picture != NULL )
 770         {
 771             /* Display the direct buffer returned by vout_RenderPicture */
 772             if( p_vout->pf_display )
 773             {
 774                 p_vout->pf_display( p_vout, p_directbuffer );
 775             }
 776
 777             /* Reinitialize idle loop count */
 778             i_idle_loops = 0;
 779
 780             /* Tell the vout this was the last picture and that it does not
 781              * need to be forced anymore. */
 782             p_last_picture = p_picture;
 783             p_last_picture->b_force = 0;
 784         }
 785
 786         /*
 787          * Check events and manage thread
 788          */
 789         if( p_vout->pf_manage && p_vout->pf_manage( p_vout ) )
 790         {
 791             /* A fatal error occured, and the thread must terminate
 792              * immediately, without displaying anything - setting b_error to 1
 793              * causes the immediate end of the main while() loop. */
 794             p_vout->b_error = 1;
 795         }
 796
 797         if( p_vout->i_changes & VOUT_SIZE_CHANGE )
 798         {
 799             /* this must only happen when the vout plugin is incapable of
 800              * rescaling the picture itself. In this case we need to destroy
 801              * the current picture buffers and recreate new ones with the right
 802              * dimensions */
 803             int i;
 804
 805             p_vout->i_changes &= ~VOUT_SIZE_CHANGE;
 806
 807             p_vout->pf_end( p_vout );
 808             for( i = 0; i < I_OUTPUTPICTURES; i++ )
 809                  p_vout->p_picture[ i ].i_status = FREE_PICTURE;
 810
 811             I_OUTPUTPICTURES = 0;
 812             if( p_vout->pf_init( p_vout ) )
 813             {
 814                 msg_Err( p_vout, "cannot resize display" );
 815                 /* FIXME: pf_end will be called again in EndThread() */
 816                 p_vout->b_error = 1;
 817             }
 818
 819             /* Need to reinitialise the chroma plugin */
 820             p_vout->chroma.p_module->pf_deactivate( VLC_OBJECT(p_vout) );
 821             p_vout->chroma.p_module->pf_activate( VLC_OBJECT(p_vout) );
 822         }
 823     }
 824
 825     /*
 826      * Error loop - wait until the thread destruction is requested
 827      */
 828     if( p_vout->b_error )
 829     {
 830         ErrorThread( p_vout );
 831     }
 832
 833     /* End of thread */
 834     EndThread( p_vout );
 835
 836     /* Destroy thread structures allocated by CreateThread */
 837     DestroyThread( p_vout );
 838 }
 839
 840 /*****************************************************************************
 841  * ErrorThread: RunThread() error loop
 842  *****************************************************************************
 843  * This function is called when an error occured during thread main's loop. The
 844  * thread can still receive feed, but must be ready to terminate as soon as
 845  * possible.
 846  *****************************************************************************/
 847 static void ErrorThread( vout_thread_t *p_vout )
 848 {
 849     /* Wait until a `die' order */
 850     while( !p_vout->b_die )
 851     {
 852         /* Sleep a while */
 853         msleep( VOUT_IDLE_SLEEP );
 854     }
 855 }
 856
 857 /*****************************************************************************
 858  * EndThread: thread destruction
 859  *****************************************************************************
 860  * This function is called when the thread ends after a sucessful
 861  * initialization. It frees all ressources allocated by InitThread.
 862  *****************************************************************************/
 863 static void EndThread( vout_thread_t *p_vout )
 864 {
 865     int     i_index;                                        /* index in heap */
 866
 867 #ifdef STATS
 868     {
 869         struct tms cpu_usage;
 870         times( &cpu_usage );
 871
 872         msg_Dbg( p_vout, "cpu usage (user: %d, system: %d)",
 873                  cpu_usage.tms_utime, cpu_usage.tms_stime );
 874     }
 875 #endif
 876
 877     if( !p_vout->b_direct )
 878     {
 879         module_Unneed( p_vout, p_vout->chroma.p_module );
 880     }
 881
 882     /* Destroy all remaining pictures */
 883     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++ )
 884     {
 885         if ( p_vout->p_picture[i_index].i_type == MEMORY_PICTURE )
 886         {
 887             free( p_vout->p_picture[i_index].p_data_orig );
 888         }
 889     }
 890
 891     /* Destroy all remaining subpictures */
 892     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++ )
 893     {
 894         if( p_vout->p_subpicture[i_index].i_status != FREE_SUBPICTURE )
 895         {
 896             free( p_vout->p_subpicture[i_index].p_sys );
 897         }
 898     }
 899
 900     /* Destroy translation tables */
 901     p_vout->pf_end( p_vout );
 902
 903     /* Release the change lock */
 904     vlc_mutex_unlock( &p_vout->change_lock );
 905 }
 906
 907 /*****************************************************************************
 908  * DestroyThread: thread destruction
 909  *****************************************************************************
 910  * This function is called when the thread ends. It frees all ressources
 911  * allocated by CreateThread. Status is available at this stage.
 912  *****************************************************************************/
 913 static void DestroyThread( vout_thread_t *p_vout )
 914 {
 915     /* Destroy the locks */
 916     vlc_mutex_destroy( &p_vout->picture_lock );
 917     vlc_mutex_destroy( &p_vout->subpicture_lock );
 918     vlc_mutex_destroy( &p_vout->change_lock );
 919
 920     /* Release the module */
 921     module_Unneed( p_vout, p_vout->p_module );
 922 }
 923
 924 /* following functions are local */
 925
 926 static int ReduceHeight( int i_ratio )
 927 {
 928     int i_dummy = VOUT_ASPECT_FACTOR;
 929     int i_pgcd  = 1;
 930
 931     if( !i_ratio )
 932     {
 933         return i_pgcd;
 934     }
 935
 936     /* VOUT_ASPECT_FACTOR is (2^7 * 3^3 * 5^3), we just check for 2, 3 and 5 */
 937     while( !(i_ratio & 1) && !(i_dummy & 1) )
 938     {
 939         i_ratio >>= 1;
 940         i_dummy >>= 1;
 941         i_pgcd  <<= 1;
 942     }
 943
 944     while( !(i_ratio % 3) && !(i_dummy % 3) )
 945     {
 946         i_ratio /= 3;
 947         i_dummy /= 3;
 948         i_pgcd  *= 3;
 949     }
 950
 951     while( !(i_ratio % 5) && !(i_dummy % 5) )
 952     {
 953         i_ratio /= 5;
 954         i_dummy /= 5;
 955         i_pgcd  *= 5;
 956     }
 957
 958     return i_pgcd;
 959 }
 960
 961 /*****************************************************************************
 962  * BinaryLog: computes the base 2 log of a binary value
 963  *****************************************************************************
 964  * This functions is used by MaskToShift, to get a bit index from a binary
 965  * value.
 966  *****************************************************************************/
 967 static int BinaryLog( uint32_t i )
 968 {
 969     int i_log = 0;
 970
 971     if( i == 0 ) return -31337;
 972
 973     if( i & 0xffff0000 ) i_log += 16;
 974     if( i & 0xff00ff00 ) i_log += 8;
 975     if( i & 0xf0f0f0f0 ) i_log += 4;
 976     if( i & 0xcccccccc ) i_log += 2;
 977     if( i & 0xaaaaaaaa ) i_log += 1;
 978
 979     return i_log;
 980 }
 981
 982 /*****************************************************************************
 983  * MaskToShift: transform a color mask into right and left shifts
 984  *****************************************************************************
 985  * This function is used for obtaining color shifts from masks.
 986  *****************************************************************************/
 987 static void MaskToShift( int *pi_left, int *pi_right, uint32_t i_mask )
 988 {
 989     uint32_t i_low, i_high;            /* lower hand higher bits of the mask */
 990
 991     if( !i_mask )
 992     {
 993         *pi_left = *pi_right = 0;
 994         return;
 995     }
 996
 997     /* Get bits */
 998     i_low =  i_mask & (- (int32_t)i_mask);          /* lower bit of the mask */
 999     i_high = i_mask + i_low;                       /* higher bit of the mask */
1000
1001     /* Transform bits into an index */
1002     i_low =  BinaryLog (i_low);
1003     i_high = BinaryLog (i_high);
1004
1005     /* Update pointers and return */
1006     *pi_left =   i_low;
1007     *pi_right = (8 - i_high + i_low);
1008 }
1009
1010 /*****************************************************************************
1011  * InitWindowSize: find the initial dimensions the video window should have.
1012  *****************************************************************************
1013  * This function will check the "width", "height" and "zoom" config options and
1014  * will calculate the size that the video window should have.
1015  *****************************************************************************/
1016 static void InitWindowSize( vout_thread_t *p_vout, int *pi_width,
1017                             int *pi_height )
1018 {
1019     int i_width, i_height;
1020     uint64_t ll_zoom;
1021
1022 #define FP_FACTOR 1000                             /* our fixed point factor */
1023
1024     i_width = config_GetInt( p_vout, "width" );
1025     i_height = config_GetInt( p_vout, "height" );
1026     ll_zoom = (uint64_t)( FP_FACTOR * config_GetFloat( p_vout, "zoom" ) );
1027
1028     if( (i_width >= 0) && (i_height >= 0))
1029     {
1030         *pi_width = (int)( i_width * ll_zoom / FP_FACTOR );
1031         *pi_height = (int)( i_height * ll_zoom / FP_FACTOR );
1032         return;
1033     }
1034     else if( i_width >= 0 )
1035     {
1036         *pi_width = (int)( i_width * ll_zoom / FP_FACTOR );
1037         *pi_height = (int)( i_width * ll_zoom * VOUT_ASPECT_FACTOR /
1038                             p_vout->render.i_aspect / FP_FACTOR );
1039         return;
1040     }
1041     else if( i_height >= 0 )
1042     {
1043         *pi_height = (int)( i_height * ll_zoom / FP_FACTOR );
1044         *pi_width = (int)( i_height * ll_zoom * p_vout->render.i_aspect /
1045                            VOUT_ASPECT_FACTOR / FP_FACTOR );
1046         return;
1047     }
1048
1049     if( p_vout->render.i_height * p_vout->render.i_aspect
1050         >= p_vout->render.i_width * VOUT_ASPECT_FACTOR )
1051     {
1052         *pi_width = (int)( p_vout->render.i_height * ll_zoom
1053           * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR / FP_FACTOR );
1054         *pi_height = (int)( p_vout->render.i_height * ll_zoom / FP_FACTOR );
1055     }
1056     else
1057     {
1058         *pi_width = (int)( p_vout->render.i_width * ll_zoom / FP_FACTOR );
1059         *pi_height = (int)( p_vout->render.i_width * ll_zoom
1060           * VOUT_ASPECT_FACTOR / p_vout->render.i_aspect / FP_FACTOR );
1061     }
1062
1063 #undef FP_FACTOR
1064 }
1065
1066 /*****************************************************************************
1067  * vout_VarCallback: generic callback for intf variables
1068  *****************************************************************************/
1069 int vout_VarCallback( vlc_object_t * p_this, const char * psz_variable,
1070                       vlc_value_t old_value, vlc_value_t new_value,
1071                       void * unused )
1072 {
1073     vout_thread_t * p_vout = (vout_thread_t *)p_this;
1074     vlc_value_t val;
1075     val.b_bool = 1;
1076     var_Set( p_vout, "intf-change", val );
1077     return 0;
1078 }