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 1.212 2003/02/09 23:42:06 sigmunau 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         char *psz_filter_chain;
 112
 113         /* We don't directly check for the "filter" variable for obvious
 114          * performance reasons. */
 115         if( p_vout->b_filter_change )
 116         {
 117             psz_filter_chain = config_GetPsz( p_this, "filter" );
 118
 119             if( psz_filter_chain && !*psz_filter_chain )
 120             {
 121                 free( psz_filter_chain );
 122                 psz_filter_chain = NULL;
 123             }
 124             if( p_vout->psz_filter_chain && !*p_vout->psz_filter_chain )
 125             {
 126                 free( p_vout->psz_filter_chain );
 127                 p_vout->psz_filter_chain = NULL;
 128             }
 129
 130             if( ( !psz_filter_chain && !p_vout->psz_filter_chain ) ||
 131                 ( psz_filter_chain && p_vout->psz_filter_chain &&
 132                   !strcmp( psz_filter_chain, p_vout->psz_filter_chain ) ) )
 133             {
 134                 p_vout->b_filter_change = VLC_FALSE;
 135             }
 136
 137             if( psz_filter_chain ) free( psz_filter_chain );
 138         }
 139
 140         if( ( p_vout->render.i_width != i_width ) ||
 141             ( p_vout->render.i_height != i_height ) ||
 142             ( p_vout->render.i_chroma != i_chroma ) ||
 143             ( p_vout->render.i_aspect != i_aspect
 144                     && !p_vout->b_override_aspect ) ||
 145             p_vout->b_filter_change )
 146         {
 147             /* We are not interested in this format, close this vout */
 148             vlc_object_detach( p_vout );
 149             vlc_object_release( p_vout );
 150             vout_Destroy( p_vout );
 151             p_vout = NULL;
 152         }
 153         else
 154         {
 155             /* This video output is cool! Hijack it. */
 156             vlc_object_detach( p_vout );
 157             vlc_object_attach( p_vout, p_this );
 158             vlc_object_release( p_vout );
 159         }
 160     }
 161
 162     if( !p_vout )
 163     {
 164         msg_Dbg( p_this, "no usable vout present, spawning one" );
 165
 166         p_vout = vout_Create( p_this, i_width, i_height, i_chroma, i_aspect );
 167     }
 168
 169     return p_vout;
 170 }
 171
 172 /*****************************************************************************
 173  * vout_Create: creates a new video output thread
 174  *****************************************************************************
 175  * This function creates a new video output thread, and returns a pointer
 176  * to its description. On error, it returns NULL.
 177  *****************************************************************************/
 178 vout_thread_t * __vout_Create( vlc_object_t *p_parent,
 179                                unsigned int i_width, unsigned int i_height,
 180                                vlc_fourcc_t i_chroma, unsigned int i_aspect )
 181 {
 182     vout_thread_t * p_vout;                             /* thread descriptor */
 183     int             i_index;                                /* loop variable */
 184     char          * psz_plugin;
 185     vlc_value_t     val;
 186
 187     /* Allocate descriptor */
 188     p_vout = vlc_object_create( p_parent, VLC_OBJECT_VOUT );
 189     if( p_vout == NULL )
 190     {
 191         msg_Err( p_parent, "out of memory" );
 192         return NULL;
 193     }
 194
 195     var_Create( p_vout, "intf-change", VLC_VAR_BOOL );
 196     val.b_bool = VLC_TRUE;
 197     var_Set( p_vout, "intf-change", val );
 198
 199     p_vout->b_override_aspect = VLC_FALSE;
 200
 201     /* If the parent is not a VOUT object, that means we are at the start of
 202      * the video output pipe */
 203     if( p_parent->i_object_type != VLC_OBJECT_VOUT )
 204     {
 205         char *psz_aspect = config_GetPsz( p_parent, "aspect-ratio" );
 206
 207         /* Check whether the user tried to override aspect ratio */
 208         if( psz_aspect )
 209         {
 210             unsigned int i_new_aspect = i_aspect;
 211             char *psz_parser = strchr( psz_aspect, ':' );
 212
 213             if( psz_parser )
 214             {
 215                 *psz_parser++ = '\0';
 216                 i_new_aspect = atoi( psz_aspect ) * VOUT_ASPECT_FACTOR
 217                                                   / atoi( psz_parser );
 218             }
 219             else
 220             {
 221                 i_new_aspect = i_width * VOUT_ASPECT_FACTOR
 222                                        * atof( psz_aspect )
 223                                        / i_height;
 224             }
 225
 226             free( psz_aspect );
 227
 228             if( i_new_aspect && i_new_aspect != i_aspect )
 229             {
 230                 int i_pgcd = ReduceHeight( i_new_aspect );
 231
 232                 msg_Dbg( p_vout, "overriding source aspect ratio to %i:%i",
 233                          i_new_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 234
 235                 i_aspect = i_new_aspect;
 236
 237                 p_vout->b_override_aspect = VLC_TRUE;
 238             }
 239         }
 240
 241         /* Look for the default filter configuration */
 242         p_vout->psz_filter_chain = config_GetPsz( p_parent, "filter" );
 243     }
 244     else
 245     {
 246         /* continue the parent's filter chain */
 247         char *psz_end;
 248
 249         psz_end = strchr( ((vout_thread_t *)p_parent)->psz_filter_chain, ':' );
 250         if( psz_end && *(psz_end+1) )
 251             p_vout->psz_filter_chain = strdup( psz_end+1 );
 252         else p_vout->psz_filter_chain = NULL;
 253     }
 254
 255     /* Choose the video output module */
 256     if( !p_vout->psz_filter_chain || !*p_vout->psz_filter_chain )
 257     {
 258         psz_plugin = config_GetPsz( p_parent, "vout" );
 259     }
 260     else
 261     {
 262         /* the filter chain is a string list of filters separated by double
 263          * colons */
 264         char *psz_end;
 265
 266         psz_end = strchr( p_vout->psz_filter_chain, ':' );
 267         if( psz_end )
 268             psz_plugin = strndup( p_vout->psz_filter_chain,
 269                                   psz_end - p_vout->psz_filter_chain );
 270         else psz_plugin = strdup( p_vout->psz_filter_chain );
 271     }
 272
 273     /* Initialize pictures and subpictures - translation tables and functions
 274      * will be initialized later in InitThread */
 275     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++)
 276     {
 277         p_vout->p_picture[i_index].i_status = FREE_PICTURE;
 278         p_vout->p_picture[i_index].i_type   = EMPTY_PICTURE;
 279     }
 280
 281     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++)
 282     {
 283         p_vout->p_subpicture[i_index].i_status = FREE_SUBPICTURE;
 284         p_vout->p_subpicture[i_index].i_type   = EMPTY_SUBPICTURE;
 285     }
 286
 287     /* No images in the heap */
 288     p_vout->i_heap_size = 0;
 289
 290     /* Initialize the rendering heap */
 291     I_RENDERPICTURES = 0;
 292     p_vout->render.i_width    = i_width;
 293     p_vout->render.i_height   = i_height;
 294     p_vout->render.i_chroma   = i_chroma;
 295     p_vout->render.i_aspect   = i_aspect;
 296
 297     p_vout->render.i_rmask    = 0;
 298     p_vout->render.i_gmask    = 0;
 299     p_vout->render.i_bmask    = 0;
 300
 301     p_vout->render.i_last_used_pic = -1;
 302     p_vout->render.b_allow_modify_pics = 1;
 303
 304     /* Zero the output heap */
 305     I_OUTPUTPICTURES = 0;
 306     p_vout->output.i_width    = 0;
 307     p_vout->output.i_height   = 0;
 308     p_vout->output.i_chroma   = 0;
 309     p_vout->output.i_aspect   = 0;
 310
 311     p_vout->output.i_rmask    = 0;
 312     p_vout->output.i_gmask    = 0;
 313     p_vout->output.i_bmask    = 0;
 314
 315     /* Initialize misc stuff */
 316     p_vout->i_changes    = 0;
 317     p_vout->f_gamma      = 0;
 318     p_vout->b_grayscale  = 0;
 319     p_vout->b_info       = 0;
 320     p_vout->b_interface  = 0;
 321     p_vout->b_scale      = 1;
 322     p_vout->b_fullscreen = 0;
 323     p_vout->render_time  = 10;
 324     p_vout->c_fps_samples = 0;
 325     p_vout->b_filter_change = 0;
 326
 327     /* Mouse coordinates */
 328     var_Create( p_vout, "mouse-x", VLC_VAR_INTEGER );
 329     var_Create( p_vout, "mouse-y", VLC_VAR_INTEGER );
 330     var_Create( p_vout, "mouse-button-down", VLC_VAR_INTEGER );
 331     var_Create( p_vout, "mouse-moved", VLC_VAR_BOOL );
 332     var_Create( p_vout, "mouse-clicked", VLC_VAR_INTEGER );
 333     var_Create( p_vout, "key-pressed", VLC_VAR_STRING );
 334
 335     /* user requested fullscreen? */
 336     if( config_GetInt( p_vout, "fullscreen" ) )
 337     {
 338         p_vout->i_changes |= VOUT_FULLSCREEN_CHANGE;
 339     }
 340
 341     /* Initialize the dimensions of the video window */
 342     InitWindowSize( p_vout, &p_vout->i_window_width,
 343                     &p_vout->i_window_height );
 344
 345
 346     p_vout->p_module = module_Need( p_vout,
 347                            ( p_vout->psz_filter_chain &&
 348                                *p_vout->psz_filter_chain ) ?
 349                            "video filter" : "video output",
 350                            psz_plugin );
 351
 352     if( psz_plugin ) free( psz_plugin );
 353     if( p_vout->p_module == NULL )
 354     {
 355         msg_Err( p_vout, "no suitable vout module" );
 356         vlc_object_destroy( p_vout );
 357         return NULL;
 358     }
 359
 360     /* Create thread and set locks */
 361     vlc_mutex_init( p_vout, &p_vout->picture_lock );
 362     vlc_mutex_init( p_vout, &p_vout->subpicture_lock );
 363     vlc_mutex_init( p_vout, &p_vout->change_lock );
 364
 365     vlc_object_attach( p_vout, p_parent );
 366
 367     if( vlc_thread_create( p_vout, "video output", RunThread,
 368                            VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
 369     {
 370         msg_Err( p_vout, "out of memory" );
 371         module_Unneed( p_vout, p_vout->p_module );
 372         vlc_object_destroy( p_vout );
 373         return NULL;
 374     }
 375
 376     return p_vout;
 377 }
 378
 379 /*****************************************************************************
 380  * vout_Destroy: destroys a previously created video output
 381  *****************************************************************************
 382  * Destroy a terminated thread.
 383  * The function will request a destruction of the specified thread. If pi_error
 384  * is NULL, it will return once the thread is destroyed. Else, it will be
 385  * update using one of the THREAD_* constants.
 386  *****************************************************************************/
 387 void vout_Destroy( vout_thread_t *p_vout )
 388 {
 389     /* Request thread destruction */
 390     p_vout->b_die = VLC_TRUE;
 391     vlc_thread_join( p_vout );
 392
 393     var_Destroy( p_vout, "intf-change" );
 394
 395     /* Free structure */
 396     vlc_object_destroy( p_vout );
 397 }
 398
 399 /*****************************************************************************
 400  * InitThread: initialize video output thread
 401  *****************************************************************************
 402  * This function is called from RunThread and performs the second step of the
 403  * initialization. It returns 0 on success. Note that the thread's flag are not
 404  * modified inside this function.
 405  *****************************************************************************/
 406 static int InitThread( vout_thread_t *p_vout )
 407 {
 408     int i, i_pgcd;
 409
 410     vlc_mutex_lock( &p_vout->change_lock );
 411
 412 #ifdef STATS
 413     p_vout->c_loops = 0;
 414 #endif
 415
 416     /* Initialize output method, it allocates direct buffers for us */
 417     if( p_vout->pf_init( p_vout ) )
 418     {
 419         vlc_mutex_unlock( &p_vout->change_lock );
 420         return VLC_EGENERIC;
 421     }
 422
 423     if( !I_OUTPUTPICTURES )
 424     {
 425         msg_Err( p_vout, "plugin was unable to allocate at least "
 426                          "one direct buffer" );
 427         p_vout->pf_end( p_vout );
 428         vlc_mutex_unlock( &p_vout->change_lock );
 429         return VLC_EGENERIC;
 430     }
 431
 432     if( I_OUTPUTPICTURES > VOUT_MAX_PICTURES )
 433     {
 434         msg_Err( p_vout, "plugin allocated too many direct buffers, "
 435                          "our internal buffers must have overflown." );
 436         p_vout->pf_end( p_vout );
 437         vlc_mutex_unlock( &p_vout->change_lock );
 438         return VLC_EGENERIC;
 439     }
 440
 441     msg_Dbg( p_vout, "got %i direct buffer(s)", I_OUTPUTPICTURES );
 442
 443 #if 0
 444     if( !p_vout->psz_filter_chain )
 445     {
 446         char *psz_aspect = config_GetPsz( p_vout, "pixel-ratio" );
 447
 448         if( psz_aspect )
 449         {
 450             int i_new_aspect = p_vout->output.i_width * VOUT_ASPECT_FACTOR
 451                                                       * atof( psz_aspect )
 452                                                       / p_vout->output.i_height;
 453             free( psz_aspect );
 454
 455             if( i_new_aspect && i_new_aspect != p_vout->output.i_aspect )
 456             {
 457                 int i_pgcd = ReduceHeight( i_new_aspect );
 458                 msg_Dbg( p_vout, "output ratio forced to %i:%i\n",
 459                          i_new_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 460                 p_vout->output.i_aspect = i_new_aspect;
 461             }
 462         }
 463     }
 464 #endif
 465
 466     i_pgcd = ReduceHeight( p_vout->render.i_aspect );
 467     msg_Dbg( p_vout,
 468              "picture in %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 469              p_vout->render.i_width, p_vout->render.i_height,
 470              p_vout->render.i_chroma, (char*)&p_vout->render.i_chroma,
 471              p_vout->render.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 472
 473     i_pgcd = ReduceHeight( p_vout->output.i_aspect );
 474     msg_Dbg( p_vout,
 475              "picture out %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 476              p_vout->output.i_width, p_vout->output.i_height,
 477              p_vout->output.i_chroma, (char*)&p_vout->output.i_chroma,
 478              p_vout->output.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 479
 480     /* Calculate shifts from system-updated masks */
 481     MaskToShift( &p_vout->output.i_lrshift, &p_vout->output.i_rrshift,
 482                  p_vout->output.i_rmask );
 483     MaskToShift( &p_vout->output.i_lgshift, &p_vout->output.i_rgshift,
 484                  p_vout->output.i_gmask );
 485     MaskToShift( &p_vout->output.i_lbshift, &p_vout->output.i_rbshift,
 486                  p_vout->output.i_bmask );
 487
 488     /* Check whether we managed to create direct buffers similar to
 489      * the render buffers, ie same size and chroma */
 490     if( ( p_vout->output.i_width == p_vout->render.i_width )
 491      && ( p_vout->output.i_height == p_vout->render.i_height )
 492      && ( vout_ChromaCmp( p_vout->output.i_chroma, p_vout->render.i_chroma ) ) )
 493     {
 494         /* Cool ! We have direct buffers, we can ask the decoder to
 495          * directly decode into them ! Map the first render buffers to
 496          * the first direct buffers, but keep the first direct buffer
 497          * for memcpy operations */
 498         p_vout->b_direct = 1;
 499
 500         for( i = 1; i < VOUT_MAX_PICTURES; i++ )
 501         {
 502             if( p_vout->p_picture[ i ].i_type != DIRECT_PICTURE &&
 503                 I_RENDERPICTURES >= VOUT_MIN_DIRECT_PICTURES - 1 &&
 504                 p_vout->p_picture[ i - 1 ].i_type == DIRECT_PICTURE )
 505             {
 506                 /* We have enough direct buffers so there's no need to
 507                  * try to use system memory buffers. */
 508                 break;
 509             }
 510             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 511             I_RENDERPICTURES++;
 512         }
 513
 514         msg_Dbg( p_vout, "direct render, mapping "
 515                  "render pictures 0-%i to system pictures 1-%i",
 516                  VOUT_MAX_PICTURES - 2, VOUT_MAX_PICTURES - 1 );
 517     }
 518     else
 519     {
 520         /* Rats... Something is wrong here, we could not find an output
 521          * plugin able to directly render what we decode. See if we can
 522          * find a chroma plugin to do the conversion */
 523         p_vout->b_direct = 0;
 524
 525         /* Choose the best module */
 526         p_vout->chroma.p_module = module_Need( p_vout, "chroma", NULL );
 527
 528         if( p_vout->chroma.p_module == NULL )
 529         {
 530             msg_Err( p_vout, "no chroma module for %4.4s to %4.4s",
 531                      (char*)&p_vout->render.i_chroma,
 532                      (char*)&p_vout->output.i_chroma );
 533             p_vout->pf_end( p_vout );
 534             vlc_mutex_unlock( &p_vout->change_lock );
 535             return VLC_EGENERIC;
 536         }
 537
 538         msg_Dbg( p_vout, "indirect render, mapping "
 539                  "render pictures 0-%i to system pictures %i-%i",
 540                  VOUT_MAX_PICTURES - 1, I_OUTPUTPICTURES,
 541                  I_OUTPUTPICTURES + VOUT_MAX_PICTURES - 1 );
 542
 543         /* Append render buffers after the direct buffers */
 544         for( i = I_OUTPUTPICTURES; i < 2 * VOUT_MAX_PICTURES; i++ )
 545         {
 546             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 547             I_RENDERPICTURES++;
 548
 549             /* Check if we have enough render pictures */
 550             if( I_RENDERPICTURES == VOUT_MAX_PICTURES )
 551                 break;
 552         }
 553     }
 554
 555     /* Link pictures back to their heap */
 556     for( i = 0 ; i < I_RENDERPICTURES ; i++ )
 557     {
 558         PP_RENDERPICTURE[ i ]->p_heap = &p_vout->render;
 559     }
 560
 561     for( i = 0 ; i < I_OUTPUTPICTURES ; i++ )
 562     {
 563         PP_OUTPUTPICTURE[ i ]->p_heap = &p_vout->output;
 564     }
 565
 566 /* XXX XXX mark thread ready */
 567     return VLC_SUCCESS;
 568 }
 569
 570 /*****************************************************************************
 571  * RunThread: video output thread
 572  *****************************************************************************
 573  * Video output thread. This function does only returns when the thread is
 574  * terminated. It handles the pictures arriving in the video heap and the
 575  * display device events.
 576  *****************************************************************************/
 577 static void RunThread( vout_thread_t *p_vout)
 578 {
 579     int             i_index;                                /* index in heap */
 580     int             i_idle_loops = 0;  /* loops without displaying a picture */
 581     mtime_t         current_date;                            /* current date */
 582     mtime_t         display_date;                            /* display date */
 583
 584     picture_t *     p_picture;                            /* picture pointer */
 585     picture_t *     p_last_picture = NULL;                   /* last picture */
 586     picture_t *     p_directbuffer;              /* direct buffer to display */
 587
 588     subpicture_t *  p_subpic;                          /* subpicture pointer */
 589
 590     /*
 591      * Initialize thread
 592      */
 593     p_vout->b_error = InitThread( p_vout );
 594     if( p_vout->b_error )
 595     {
 596         /* Destroy thread structures allocated by Create and InitThread */
 597         DestroyThread( p_vout );
 598         return;
 599     }
 600
 601     /*
 602      * Main loop - it is not executed if an error occured during
 603      * initialization
 604      */
 605     while( (!p_vout->b_die) && (!p_vout->b_error) )
 606     {
 607         /* Initialize loop variables */
 608         p_picture = NULL;
 609         display_date = 0;
 610         current_date = mdate();
 611
 612 #ifdef STATS
 613         p_vout->c_loops++;
 614         if( !(p_vout->c_loops % VOUT_STATS_NB_LOOPS) )
 615         {
 616             msg_Dbg( p_vout, "picture heap: %d/%d",
 617                      I_RENDERPICTURES, p_vout->i_heap_size );
 618         }
 619 #endif
 620
 621         /*
 622          * Find the picture to display (the one with the earliest date).
 623          * This operation does not need lock, since only READY_PICTUREs
 624          * are handled. */
 625         for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 626         {
 627             if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 628                 && ( (p_picture == NULL) ||
 629                      (PP_RENDERPICTURE[i_index]->date < display_date) ) )
 630             {
 631                 p_picture = PP_RENDERPICTURE[i_index];
 632                 display_date = p_picture->date;
 633             }
 634         }
 635
 636         if( p_picture )
 637         {
 638             /* If we met the last picture, parse again to see whether there is
 639              * a more appropriate one. */
 640             if( p_picture == p_last_picture )
 641             {
 642                 for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 643                 {
 644                     if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 645                         && (PP_RENDERPICTURE[i_index] != p_last_picture)
 646                         && ((p_picture == p_last_picture) ||
 647                             (PP_RENDERPICTURE[i_index]->date < display_date)) )
 648                     {
 649                         p_picture = PP_RENDERPICTURE[i_index];
 650                         display_date = p_picture->date;
 651                     }
 652                 }
 653             }
 654
 655             /* If we found better than the last picture, destroy it */
 656             if( p_last_picture && p_picture != p_last_picture )
 657             {
 658                 vlc_mutex_lock( &p_vout->picture_lock );
 659                 if( p_last_picture->i_refcount )
 660                 {
 661                     p_last_picture->i_status = DISPLAYED_PICTURE;
 662                 }
 663                 else
 664                 {
 665                     p_last_picture->i_status = DESTROYED_PICTURE;
 666                     p_vout->i_heap_size--;
 667                 }
 668                 vlc_mutex_unlock( &p_vout->picture_lock );
 669                 p_last_picture = NULL;
 670             }
 671
 672             /* Compute FPS rate */
 673             p_vout->p_fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ]
 674                 = display_date;
 675
 676             if( !p_picture->b_force &&
 677                 p_picture != p_last_picture &&
 678                 display_date < current_date + p_vout->render_time )
 679             {
 680                 /* Picture is late: it will be destroyed and the thread
 681                  * will directly choose the next picture */
 682                 vlc_mutex_lock( &p_vout->picture_lock );
 683                 if( p_picture->i_refcount )
 684                 {
 685                     /* Pretend we displayed the picture, but don't destroy
 686                      * it since the decoder might still need it. */
 687                     p_picture->i_status = DISPLAYED_PICTURE;
 688                 }
 689                 else
 690                 {
 691                     /* Destroy the picture without displaying it */
 692                     p_picture->i_status = DESTROYED_PICTURE;
 693                     p_vout->i_heap_size--;
 694                 }
 695                 msg_Warn( p_vout, "late picture skipped ("I64Fd")",
 696                                   current_date - display_date );
 697                 vlc_mutex_unlock( &p_vout->picture_lock );
 698
 699                 continue;
 700             }
 701 #if 0
 702             /* Removed because it causes problems for some people --Meuuh */
 703             if( display_date > current_date + VOUT_BOGUS_DELAY )
 704             {
 705                 /* Picture is waaay too early: it will be destroyed */
 706                 vlc_mutex_lock( &p_vout->picture_lock );
 707                 if( p_picture->i_refcount )
 708                 {
 709                     /* Pretend we displayed the picture, but don't destroy
 710                      * it since the decoder might still need it. */
 711                     p_picture->i_status = DISPLAYED_PICTURE;
 712                 }
 713                 else
 714                 {
 715                     /* Destroy the picture without displaying it */
 716                     p_picture->i_status = DESTROYED_PICTURE;
 717                     p_vout->i_heap_size--;
 718                 }
 719                 intf_WarnMsg( 1, "vout warning: early picture skipped "
 720                               "("I64Fd")", display_date - current_date );
 721                 vlc_mutex_unlock( &p_vout->picture_lock );
 722
 723                 continue;
 724             }
 725 #endif
 726             if( display_date > current_date + VOUT_DISPLAY_DELAY )
 727             {
 728                 /* A picture is ready to be rendered, but its rendering date
 729                  * is far from the current one so the thread will perform an
 730                  * empty loop as if no picture were found. The picture state
 731                  * is unchanged */
 732                 p_picture    = NULL;
 733                 display_date = 0;
 734             }
 735             else if( p_picture == p_last_picture )
 736             {
 737                 /* We are asked to repeat the previous picture, but we first
 738                  * wait for a couple of idle loops */
 739                 if( i_idle_loops < 4 )
 740                 {
 741                     p_picture    = NULL;
 742                     display_date = 0;
 743                 }
 744                 else
 745                 {
 746                     /* We set the display date to something high, otherwise
 747                      * we'll have lots of problems with late pictures */
 748                     display_date = current_date + p_vout->render_time;
 749                 }
 750             }
 751         }
 752
 753         if( p_picture == NULL )
 754         {
 755             i_idle_loops++;
 756         }
 757
 758         /*
 759          * Check for subpictures to display
 760          */
 761         p_subpic = vout_SortSubPictures( p_vout, display_date );
 762
 763         /*
 764          * Perform rendering
 765          */
 766         p_directbuffer = vout_RenderPicture( p_vout, p_picture, p_subpic );
 767
 768         /*
 769          * Call the plugin-specific rendering method if there is one
 770          */
 771         if( p_picture != NULL && p_vout->pf_render )
 772         {
 773             /* Render the direct buffer returned by vout_RenderPicture */
 774             p_vout->pf_render( p_vout, p_directbuffer );
 775         }
 776
 777         /*
 778          * Sleep, wake up
 779          */
 780         if( display_date != 0 )
 781         {
 782             /* Store render time using a sliding mean */
 783             p_vout->render_time += mdate() - current_date;
 784             p_vout->render_time >>= 1;
 785         }
 786
 787         /* Give back change lock */
 788         vlc_mutex_unlock( &p_vout->change_lock );
 789
 790         /* Sleep a while or until a given date */
 791         if( display_date != 0 )
 792         {
 793             mwait( display_date - VOUT_MWAIT_TOLERANCE );
 794         }
 795         else
 796         {
 797             msleep( VOUT_IDLE_SLEEP );
 798         }
 799
 800         /* On awakening, take back lock and send immediately picture
 801          * to display. */
 802         vlc_mutex_lock( &p_vout->change_lock );
 803
 804         /*
 805          * Display the previously rendered picture
 806          */
 807         if( p_picture != NULL )
 808         {
 809             /* Display the direct buffer returned by vout_RenderPicture */
 810             if( p_vout->pf_display )
 811             {
 812                 p_vout->pf_display( p_vout, p_directbuffer );
 813             }
 814
 815             /* Reinitialize idle loop count */
 816             i_idle_loops = 0;
 817
 818             /* Tell the vout this was the last picture and that it does not
 819              * need to be forced anymore. */
 820             p_last_picture = p_picture;
 821             p_last_picture->b_force = 0;
 822         }
 823
 824         /*
 825          * Check events and manage thread
 826          */
 827         if( p_vout->pf_manage && p_vout->pf_manage( p_vout ) )
 828         {
 829             /* A fatal error occured, and the thread must terminate
 830              * immediately, without displaying anything - setting b_error to 1
 831              * causes the immediate end of the main while() loop. */
 832             p_vout->b_error = 1;
 833         }
 834
 835         if( p_vout->i_changes & VOUT_SIZE_CHANGE )
 836         {
 837             /* this must only happen when the vout plugin is incapable of
 838              * rescaling the picture itself. In this case we need to destroy
 839              * the current picture buffers and recreate new ones with the right
 840              * dimensions */
 841             int i;
 842
 843             p_vout->i_changes &= ~VOUT_SIZE_CHANGE;
 844
 845             p_vout->pf_end( p_vout );
 846             for( i = 0; i < I_OUTPUTPICTURES; i++ )
 847                  p_vout->p_picture[ i ].i_status = FREE_PICTURE;
 848
 849             I_OUTPUTPICTURES = 0;
 850             if( p_vout->pf_init( p_vout ) )
 851             {
 852                 msg_Err( p_vout, "cannot resize display" );
 853                 /* FIXME: pf_end will be called again in EndThread() */
 854                 p_vout->b_error = 1;
 855             }
 856
 857             /* Need to reinitialise the chroma plugin */
 858             p_vout->chroma.p_module->pf_deactivate( VLC_OBJECT(p_vout) );
 859             p_vout->chroma.p_module->pf_activate( VLC_OBJECT(p_vout) );
 860         }
 861     }
 862
 863     /*
 864      * Error loop - wait until the thread destruction is requested
 865      */
 866     if( p_vout->b_error )
 867     {
 868         ErrorThread( p_vout );
 869     }
 870
 871     /* End of thread */
 872     EndThread( p_vout );
 873
 874     /* Destroy thread structures allocated by CreateThread */
 875     DestroyThread( p_vout );
 876 }
 877
 878 /*****************************************************************************
 879  * ErrorThread: RunThread() error loop
 880  *****************************************************************************
 881  * This function is called when an error occured during thread main's loop. The
 882  * thread can still receive feed, but must be ready to terminate as soon as
 883  * possible.
 884  *****************************************************************************/
 885 static void ErrorThread( vout_thread_t *p_vout )
 886 {
 887     /* Wait until a `die' order */
 888     while( !p_vout->b_die )
 889     {
 890         /* Sleep a while */
 891         msleep( VOUT_IDLE_SLEEP );
 892     }
 893 }
 894
 895 /*****************************************************************************
 896  * EndThread: thread destruction
 897  *****************************************************************************
 898  * This function is called when the thread ends after a sucessful
 899  * initialization. It frees all ressources allocated by InitThread.
 900  *****************************************************************************/
 901 static void EndThread( vout_thread_t *p_vout )
 902 {
 903     int     i_index;                                        /* index in heap */
 904
 905 #ifdef STATS
 906     {
 907         struct tms cpu_usage;
 908         times( &cpu_usage );
 909
 910         msg_Dbg( p_vout, "cpu usage (user: %d, system: %d)",
 911                  cpu_usage.tms_utime, cpu_usage.tms_stime );
 912     }
 913 #endif
 914
 915     if( !p_vout->b_direct )
 916     {
 917         module_Unneed( p_vout, p_vout->chroma.p_module );
 918     }
 919
 920     /* Destroy all remaining pictures */
 921     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++ )
 922     {
 923         if ( p_vout->p_picture[i_index].i_type == MEMORY_PICTURE )
 924         {
 925             free( p_vout->p_picture[i_index].p_data_orig );
 926         }
 927     }
 928
 929     /* Destroy all remaining subpictures */
 930     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++ )
 931     {
 932         if( p_vout->p_subpicture[i_index].i_status != FREE_SUBPICTURE )
 933         {
 934             vout_DestroySubPicture( p_vout,
 935                                     &p_vout->p_subpicture[i_index] );
 936         }
 937     }
 938
 939     /* Destroy translation tables */
 940     p_vout->pf_end( p_vout );
 941
 942     /* Release the change lock */
 943     vlc_mutex_unlock( &p_vout->change_lock );
 944 }
 945
 946 /*****************************************************************************
 947  * DestroyThread: thread destruction
 948  *****************************************************************************
 949  * This function is called when the thread ends. It frees all ressources
 950  * allocated by CreateThread. Status is available at this stage.
 951  *****************************************************************************/
 952 static void DestroyThread( vout_thread_t *p_vout )
 953 {
 954     /* Destroy the locks */
 955     vlc_mutex_destroy( &p_vout->picture_lock );
 956     vlc_mutex_destroy( &p_vout->subpicture_lock );
 957     vlc_mutex_destroy( &p_vout->change_lock );
 958
 959     /* Release the module */
 960     module_Unneed( p_vout, p_vout->p_module );
 961 }
 962
 963 /* following functions are local */
 964
 965 static int ReduceHeight( int i_ratio )
 966 {
 967     int i_dummy = VOUT_ASPECT_FACTOR;
 968     int i_pgcd  = 1;
 969
 970     if( !i_ratio )
 971     {
 972         return i_pgcd;
 973     }
 974
 975     /* VOUT_ASPECT_FACTOR is (2^7 * 3^3 * 5^3), we just check for 2, 3 and 5 */
 976     while( !(i_ratio & 1) && !(i_dummy & 1) )
 977     {
 978         i_ratio >>= 1;
 979         i_dummy >>= 1;
 980         i_pgcd  <<= 1;
 981     }
 982
 983     while( !(i_ratio % 3) && !(i_dummy % 3) )
 984     {
 985         i_ratio /= 3;
 986         i_dummy /= 3;
 987         i_pgcd  *= 3;
 988     }
 989
 990     while( !(i_ratio % 5) && !(i_dummy % 5) )
 991     {
 992         i_ratio /= 5;
 993         i_dummy /= 5;
 994         i_pgcd  *= 5;
 995     }
 996
 997     return i_pgcd;
 998 }
 999
1000 /*****************************************************************************
1001  * BinaryLog: computes the base 2 log of a binary value
1002  *****************************************************************************
1003  * This functions is used by MaskToShift, to get a bit index from a binary
1004  * value.
1005  *****************************************************************************/
1006 static int BinaryLog( uint32_t i )
1007 {
1008     int i_log = 0;
1009
1010     if( i == 0 ) return -31337;
1011
1012     if( i & 0xffff0000 ) i_log += 16;
1013     if( i & 0xff00ff00 ) i_log += 8;
1014     if( i & 0xf0f0f0f0 ) i_log += 4;
1015     if( i & 0xcccccccc ) i_log += 2;
1016     if( i & 0xaaaaaaaa ) i_log += 1;
1017
1018     return i_log;
1019 }
1020
1021 /*****************************************************************************
1022  * MaskToShift: transform a color mask into right and left shifts
1023  *****************************************************************************
1024  * This function is used for obtaining color shifts from masks.
1025  *****************************************************************************/
1026 static void MaskToShift( int *pi_left, int *pi_right, uint32_t i_mask )
1027 {
1028     uint32_t i_low, i_high;            /* lower hand higher bits of the mask */
1029
1030     if( !i_mask )
1031     {
1032         *pi_left = *pi_right = 0;
1033         return;
1034     }
1035
1036     /* Get bits */
1037     i_low =  i_mask & (- (int32_t)i_mask);          /* lower bit of the mask */
1038     i_high = i_mask + i_low;                       /* higher bit of the mask */
1039
1040     /* Transform bits into an index */
1041     i_low =  BinaryLog (i_low);
1042     i_high = BinaryLog (i_high);
1043
1044     /* Update pointers and return */
1045     *pi_left =   i_low;
1046     *pi_right = (8 - i_high + i_low);
1047 }
1048
1049 /*****************************************************************************
1050  * InitWindowSize: find the initial dimensions the video window should have.
1051  *****************************************************************************
1052  * This function will check the "width", "height" and "zoom" config options and
1053  * will calculate the size that the video window should have.
1054  *****************************************************************************/
1055 static void InitWindowSize( vout_thread_t *p_vout, int *pi_width,
1056                             int *pi_height )
1057 {
1058     int i_width, i_height;
1059     uint64_t ll_zoom;
1060
1061 #define FP_FACTOR 1000                             /* our fixed point factor */
1062
1063     i_width = config_GetInt( p_vout, "width" );
1064     i_height = config_GetInt( p_vout, "height" );
1065     ll_zoom = (uint64_t)( FP_FACTOR * config_GetFloat( p_vout, "zoom" ) );
1066
1067     if( (i_width >= 0) && (i_height >= 0))
1068     {
1069         *pi_width = (int)( i_width * ll_zoom / FP_FACTOR );
1070         *pi_height = (int)( i_height * ll_zoom / FP_FACTOR );
1071         return;
1072     }
1073     else if( i_width >= 0 )
1074     {
1075         *pi_width = (int)( i_width * ll_zoom / FP_FACTOR );
1076         *pi_height = (int)( i_width * ll_zoom * VOUT_ASPECT_FACTOR /
1077                             p_vout->render.i_aspect / FP_FACTOR );
1078         return;
1079     }
1080     else if( i_height >= 0 )
1081     {
1082         *pi_height = (int)( i_height * ll_zoom / FP_FACTOR );
1083         *pi_width = (int)( i_height * ll_zoom * p_vout->render.i_aspect /
1084                            VOUT_ASPECT_FACTOR / FP_FACTOR );
1085         return;
1086     }
1087
1088     if( p_vout->render.i_height * p_vout->render.i_aspect
1089         >= p_vout->render.i_width * VOUT_ASPECT_FACTOR )
1090     {
1091         *pi_width = (int)( p_vout->render.i_height * ll_zoom
1092           * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR / FP_FACTOR );
1093         *pi_height = (int)( p_vout->render.i_height * ll_zoom / FP_FACTOR );
1094     }
1095     else
1096     {
1097         *pi_width = (int)( p_vout->render.i_width * ll_zoom / FP_FACTOR );
1098         *pi_height = (int)( p_vout->render.i_width * ll_zoom
1099           * VOUT_ASPECT_FACTOR / p_vout->render.i_aspect / FP_FACTOR );
1100     }
1101
1102 #undef FP_FACTOR
1103 }
1104
1105 /*****************************************************************************
1106  * vout_VarCallback: generic callback for intf variables
1107  *****************************************************************************/
1108 int vout_VarCallback( vlc_object_t * p_this, const char * psz_variable,
1109                       vlc_value_t old_value, vlc_value_t new_value,
1110                       void * unused )
1111 {
1112     vout_thread_t * p_vout = (vout_thread_t *)p_this;
1113     vlc_value_t val;
1114     val.b_bool = 1;
1115     var_Set( p_vout, "intf-change", val );
1116     return 0;
1117 }