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 1.211 2003/01/30 19:14:17 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             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-moved", VLC_VAR_BOOL );
 331     var_Create( p_vout, "mouse-clicked", VLC_VAR_INTEGER );
 332     var_Create( p_vout, "key-pressed", VLC_VAR_STRING );
 333
 334     /* user requested fullscreen? */
 335     if( config_GetInt( p_vout, "fullscreen" ) )
 336     {
 337         p_vout->i_changes |= VOUT_FULLSCREEN_CHANGE;
 338     }
 339
 340     /* Initialize the dimensions of the video window */
 341     InitWindowSize( p_vout, &p_vout->i_window_width,
 342                     &p_vout->i_window_height );
 343
 344
 345     p_vout->p_module = module_Need( p_vout,
 346                            ( p_vout->psz_filter_chain &&
 347                                *p_vout->psz_filter_chain ) ?
 348                            "video filter" : "video output",
 349                            psz_plugin );
 350
 351     if( psz_plugin ) free( psz_plugin );
 352     if( p_vout->p_module == NULL )
 353     {
 354         msg_Err( p_vout, "no suitable vout module" );
 355         vlc_object_destroy( p_vout );
 356         return NULL;
 357     }
 358
 359     /* Create thread and set locks */
 360     vlc_mutex_init( p_vout, &p_vout->picture_lock );
 361     vlc_mutex_init( p_vout, &p_vout->subpicture_lock );
 362     vlc_mutex_init( p_vout, &p_vout->change_lock );
 363
 364     vlc_object_attach( p_vout, p_parent );
 365
 366     if( vlc_thread_create( p_vout, "video output", RunThread,
 367                            VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
 368     {
 369         msg_Err( p_vout, "out of memory" );
 370         module_Unneed( p_vout, p_vout->p_module );
 371         vlc_object_destroy( p_vout );
 372         return NULL;
 373     }
 374
 375     return p_vout;
 376 }
 377
 378 /*****************************************************************************
 379  * vout_Destroy: destroys a previously created video output
 380  *****************************************************************************
 381  * Destroy a terminated thread.
 382  * The function will request a destruction of the specified thread. If pi_error
 383  * is NULL, it will return once the thread is destroyed. Else, it will be
 384  * update using one of the THREAD_* constants.
 385  *****************************************************************************/
 386 void vout_Destroy( vout_thread_t *p_vout )
 387 {
 388     /* Request thread destruction */
 389     p_vout->b_die = VLC_TRUE;
 390     vlc_thread_join( p_vout );
 391
 392     var_Destroy( p_vout, "intf-change" );
 393
 394     /* Free structure */
 395     vlc_object_destroy( p_vout );
 396 }
 397
 398 /*****************************************************************************
 399  * InitThread: initialize video output thread
 400  *****************************************************************************
 401  * This function is called from RunThread and performs the second step of the
 402  * initialization. It returns 0 on success. Note that the thread's flag are not
 403  * modified inside this function.
 404  *****************************************************************************/
 405 static int InitThread( vout_thread_t *p_vout )
 406 {
 407     int i, i_pgcd;
 408
 409     vlc_mutex_lock( &p_vout->change_lock );
 410
 411 #ifdef STATS
 412     p_vout->c_loops = 0;
 413 #endif
 414
 415     /* Initialize output method, it allocates direct buffers for us */
 416     if( p_vout->pf_init( p_vout ) )
 417     {
 418         vlc_mutex_unlock( &p_vout->change_lock );
 419         return VLC_EGENERIC;
 420     }
 421
 422     if( !I_OUTPUTPICTURES )
 423     {
 424         msg_Err( p_vout, "plugin was unable to allocate at least "
 425                          "one direct buffer" );
 426         p_vout->pf_end( p_vout );
 427         vlc_mutex_unlock( &p_vout->change_lock );
 428         return VLC_EGENERIC;
 429     }
 430
 431     if( I_OUTPUTPICTURES > VOUT_MAX_PICTURES )
 432     {
 433         msg_Err( p_vout, "plugin allocated too many direct buffers, "
 434                          "our internal buffers must have overflown." );
 435         p_vout->pf_end( p_vout );
 436         vlc_mutex_unlock( &p_vout->change_lock );
 437         return VLC_EGENERIC;
 438     }
 439
 440     msg_Dbg( p_vout, "got %i direct buffer(s)", I_OUTPUTPICTURES );
 441
 442 #if 0
 443     if( !p_vout->psz_filter_chain )
 444     {
 445         char *psz_aspect = config_GetPsz( p_vout, "pixel-ratio" );
 446
 447         if( psz_aspect )
 448         {
 449             int i_new_aspect = p_vout->output.i_width * VOUT_ASPECT_FACTOR
 450                                                       * atof( psz_aspect )
 451                                                       / p_vout->output.i_height;
 452             free( psz_aspect );
 453
 454             if( i_new_aspect && i_new_aspect != p_vout->output.i_aspect )
 455             {
 456                 int i_pgcd = ReduceHeight( i_new_aspect );
 457                 msg_Dbg( p_vout, "output ratio forced to %i:%i\n",
 458                          i_new_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 459                 p_vout->output.i_aspect = i_new_aspect;
 460             }
 461         }
 462     }
 463 #endif
 464
 465     i_pgcd = ReduceHeight( p_vout->render.i_aspect );
 466     msg_Dbg( p_vout,
 467              "picture in %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 468              p_vout->render.i_width, p_vout->render.i_height,
 469              p_vout->render.i_chroma, (char*)&p_vout->render.i_chroma,
 470              p_vout->render.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 471
 472     i_pgcd = ReduceHeight( p_vout->output.i_aspect );
 473     msg_Dbg( p_vout,
 474              "picture out %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 475              p_vout->output.i_width, p_vout->output.i_height,
 476              p_vout->output.i_chroma, (char*)&p_vout->output.i_chroma,
 477              p_vout->output.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 478
 479     /* Calculate shifts from system-updated masks */
 480     MaskToShift( &p_vout->output.i_lrshift, &p_vout->output.i_rrshift,
 481                  p_vout->output.i_rmask );
 482     MaskToShift( &p_vout->output.i_lgshift, &p_vout->output.i_rgshift,
 483                  p_vout->output.i_gmask );
 484     MaskToShift( &p_vout->output.i_lbshift, &p_vout->output.i_rbshift,
 485                  p_vout->output.i_bmask );
 486
 487     /* Check whether we managed to create direct buffers similar to
 488      * the render buffers, ie same size and chroma */
 489     if( ( p_vout->output.i_width == p_vout->render.i_width )
 490      && ( p_vout->output.i_height == p_vout->render.i_height )
 491      && ( vout_ChromaCmp( p_vout->output.i_chroma, p_vout->render.i_chroma ) ) )
 492     {
 493         /* Cool ! We have direct buffers, we can ask the decoder to
 494          * directly decode into them ! Map the first render buffers to
 495          * the first direct buffers, but keep the first direct buffer
 496          * for memcpy operations */
 497         p_vout->b_direct = 1;
 498
 499         for( i = 1; i < VOUT_MAX_PICTURES; i++ )
 500         {
 501             if( p_vout->p_picture[ i ].i_type != DIRECT_PICTURE &&
 502                 I_RENDERPICTURES >= VOUT_MIN_DIRECT_PICTURES - 1 &&
 503                 p_vout->p_picture[ i - 1 ].i_type == DIRECT_PICTURE )
 504             {
 505                 /* We have enough direct buffers so there's no need to
 506                  * try to use system memory buffers. */
 507                 break;
 508             }
 509             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 510             I_RENDERPICTURES++;
 511         }
 512
 513         msg_Dbg( p_vout, "direct render, mapping "
 514                  "render pictures 0-%i to system pictures 1-%i",
 515                  VOUT_MAX_PICTURES - 2, VOUT_MAX_PICTURES - 1 );
 516     }
 517     else
 518     {
 519         /* Rats... Something is wrong here, we could not find an output
 520          * plugin able to directly render what we decode. See if we can
 521          * find a chroma plugin to do the conversion */
 522         p_vout->b_direct = 0;
 523
 524         /* Choose the best module */
 525         p_vout->chroma.p_module = module_Need( p_vout, "chroma", NULL );
 526
 527         if( p_vout->chroma.p_module == NULL )
 528         {
 529             msg_Err( p_vout, "no chroma module for %4.4s to %4.4s",
 530                      (char*)&p_vout->render.i_chroma,
 531                      (char*)&p_vout->output.i_chroma );
 532             p_vout->pf_end( p_vout );
 533             vlc_mutex_unlock( &p_vout->change_lock );
 534             return VLC_EGENERIC;
 535         }
 536
 537         msg_Dbg( p_vout, "indirect render, mapping "
 538                  "render pictures 0-%i to system pictures %i-%i",
 539                  VOUT_MAX_PICTURES - 1, I_OUTPUTPICTURES,
 540                  I_OUTPUTPICTURES + VOUT_MAX_PICTURES - 1 );
 541
 542         /* Append render buffers after the direct buffers */
 543         for( i = I_OUTPUTPICTURES; i < 2 * VOUT_MAX_PICTURES; i++ )
 544         {
 545             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 546             I_RENDERPICTURES++;
 547
 548             /* Check if we have enough render pictures */
 549             if( I_RENDERPICTURES == VOUT_MAX_PICTURES )
 550                 break;
 551         }
 552     }
 553
 554     /* Link pictures back to their heap */
 555     for( i = 0 ; i < I_RENDERPICTURES ; i++ )
 556     {
 557         PP_RENDERPICTURE[ i ]->p_heap = &p_vout->render;
 558     }
 559
 560     for( i = 0 ; i < I_OUTPUTPICTURES ; i++ )
 561     {
 562         PP_OUTPUTPICTURE[ i ]->p_heap = &p_vout->output;
 563     }
 564
 565 /* XXX XXX mark thread ready */
 566     return VLC_SUCCESS;
 567 }
 568
 569 /*****************************************************************************
 570  * RunThread: video output thread
 571  *****************************************************************************
 572  * Video output thread. This function does only returns when the thread is
 573  * terminated. It handles the pictures arriving in the video heap and the
 574  * display device events.
 575  *****************************************************************************/
 576 static void RunThread( vout_thread_t *p_vout)
 577 {
 578     int             i_index;                                /* index in heap */
 579     int             i_idle_loops = 0;  /* loops without displaying a picture */
 580     mtime_t         current_date;                            /* current date */
 581     mtime_t         display_date;                            /* display date */
 582
 583     picture_t *     p_picture;                            /* picture pointer */
 584     picture_t *     p_last_picture = NULL;                   /* last picture */
 585     picture_t *     p_directbuffer;              /* direct buffer to display */
 586
 587     subpicture_t *  p_subpic;                          /* subpicture pointer */
 588
 589     /*
 590      * Initialize thread
 591      */
 592     p_vout->b_error = InitThread( p_vout );
 593     if( p_vout->b_error )
 594     {
 595         /* Destroy thread structures allocated by Create and InitThread */
 596         DestroyThread( p_vout );
 597         return;
 598     }
 599
 600     /*
 601      * Main loop - it is not executed if an error occured during
 602      * initialization
 603      */
 604     while( (!p_vout->b_die) && (!p_vout->b_error) )
 605     {
 606         /* Initialize loop variables */
 607         p_picture = NULL;
 608         display_date = 0;
 609         current_date = mdate();
 610
 611 #ifdef STATS
 612         p_vout->c_loops++;
 613         if( !(p_vout->c_loops % VOUT_STATS_NB_LOOPS) )
 614         {
 615             msg_Dbg( p_vout, "picture heap: %d/%d",
 616                      I_RENDERPICTURES, p_vout->i_heap_size );
 617         }
 618 #endif
 619
 620         /*
 621          * Find the picture to display (the one with the earliest date).
 622          * This operation does not need lock, since only READY_PICTUREs
 623          * are handled. */
 624         for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 625         {
 626             if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 627                 && ( (p_picture == NULL) ||
 628                      (PP_RENDERPICTURE[i_index]->date < display_date) ) )
 629             {
 630                 p_picture = PP_RENDERPICTURE[i_index];
 631                 display_date = p_picture->date;
 632             }
 633         }
 634
 635         if( p_picture )
 636         {
 637             /* If we met the last picture, parse again to see whether there is
 638              * a more appropriate one. */
 639             if( p_picture == p_last_picture )
 640             {
 641                 for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 642                 {
 643                     if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 644                         && (PP_RENDERPICTURE[i_index] != p_last_picture)
 645                         && ((p_picture == p_last_picture) ||
 646                             (PP_RENDERPICTURE[i_index]->date < display_date)) )
 647                     {
 648                         p_picture = PP_RENDERPICTURE[i_index];
 649                         display_date = p_picture->date;
 650                     }
 651                 }
 652             }
 653
 654             /* If we found better than the last picture, destroy it */
 655             if( p_last_picture && p_picture != p_last_picture )
 656             {
 657                 vlc_mutex_lock( &p_vout->picture_lock );
 658                 if( p_last_picture->i_refcount )
 659                 {
 660                     p_last_picture->i_status = DISPLAYED_PICTURE;
 661                 }
 662                 else
 663                 {
 664                     p_last_picture->i_status = DESTROYED_PICTURE;
 665                     p_vout->i_heap_size--;
 666                 }
 667                 vlc_mutex_unlock( &p_vout->picture_lock );
 668                 p_last_picture = NULL;
 669             }
 670
 671             /* Compute FPS rate */
 672             p_vout->p_fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ]
 673                 = display_date;
 674
 675             if( !p_picture->b_force &&
 676                 p_picture != p_last_picture &&
 677                 display_date < current_date + p_vout->render_time )
 678             {
 679                 /* Picture is late: it will be destroyed and the thread
 680                  * will directly choose the next picture */
 681                 vlc_mutex_lock( &p_vout->picture_lock );
 682                 if( p_picture->i_refcount )
 683                 {
 684                     /* Pretend we displayed the picture, but don't destroy
 685                      * it since the decoder might still need it. */
 686                     p_picture->i_status = DISPLAYED_PICTURE;
 687                 }
 688                 else
 689                 {
 690                     /* Destroy the picture without displaying it */
 691                     p_picture->i_status = DESTROYED_PICTURE;
 692                     p_vout->i_heap_size--;
 693                 }
 694                 msg_Warn( p_vout, "late picture skipped ("I64Fd")",
 695                                   current_date - display_date );
 696                 vlc_mutex_unlock( &p_vout->picture_lock );
 697
 698                 continue;
 699             }
 700 #if 0
 701             /* Removed because it causes problems for some people --Meuuh */
 702             if( display_date > current_date + VOUT_BOGUS_DELAY )
 703             {
 704                 /* Picture is waaay too early: it will be destroyed */
 705                 vlc_mutex_lock( &p_vout->picture_lock );
 706                 if( p_picture->i_refcount )
 707                 {
 708                     /* Pretend we displayed the picture, but don't destroy
 709                      * it since the decoder might still need it. */
 710                     p_picture->i_status = DISPLAYED_PICTURE;
 711                 }
 712                 else
 713                 {
 714                     /* Destroy the picture without displaying it */
 715                     p_picture->i_status = DESTROYED_PICTURE;
 716                     p_vout->i_heap_size--;
 717                 }
 718                 intf_WarnMsg( 1, "vout warning: early picture skipped "
 719                               "("I64Fd")", display_date - current_date );
 720                 vlc_mutex_unlock( &p_vout->picture_lock );
 721
 722                 continue;
 723             }
 724 #endif
 725             if( display_date > current_date + VOUT_DISPLAY_DELAY )
 726             {
 727                 /* A picture is ready to be rendered, but its rendering date
 728                  * is far from the current one so the thread will perform an
 729                  * empty loop as if no picture were found. The picture state
 730                  * is unchanged */
 731                 p_picture    = NULL;
 732                 display_date = 0;
 733             }
 734             else if( p_picture == p_last_picture )
 735             {
 736                 /* We are asked to repeat the previous picture, but we first
 737                  * wait for a couple of idle loops */
 738                 if( i_idle_loops < 4 )
 739                 {
 740                     p_picture    = NULL;
 741                     display_date = 0;
 742                 }
 743                 else
 744                 {
 745                     /* We set the display date to something high, otherwise
 746                      * we'll have lots of problems with late pictures */
 747                     display_date = current_date + p_vout->render_time;
 748                 }
 749             }
 750         }
 751
 752         if( p_picture == NULL )
 753         {
 754             i_idle_loops++;
 755         }
 756
 757         /*
 758          * Check for subpictures to display
 759          */
 760         p_subpic = vout_SortSubPictures( p_vout, display_date );
 761
 762         /*
 763          * Perform rendering
 764          */
 765         p_directbuffer = vout_RenderPicture( p_vout, p_picture, p_subpic );
 766
 767         /*
 768          * Call the plugin-specific rendering method if there is one
 769          */
 770         if( p_picture != NULL && p_vout->pf_render )
 771         {
 772             /* Render the direct buffer returned by vout_RenderPicture */
 773             p_vout->pf_render( p_vout, p_directbuffer );
 774         }
 775
 776         /*
 777          * Sleep, wake up
 778          */
 779         if( display_date != 0 )
 780         {
 781             /* Store render time using a sliding mean */
 782             p_vout->render_time += mdate() - current_date;
 783             p_vout->render_time >>= 1;
 784         }
 785
 786         /* Give back change lock */
 787         vlc_mutex_unlock( &p_vout->change_lock );
 788
 789         /* Sleep a while or until a given date */
 790         if( display_date != 0 )
 791         {
 792             mwait( display_date - VOUT_MWAIT_TOLERANCE );
 793         }
 794         else
 795         {
 796             msleep( VOUT_IDLE_SLEEP );
 797         }
 798
 799         /* On awakening, take back lock and send immediately picture
 800          * to display. */
 801         vlc_mutex_lock( &p_vout->change_lock );
 802
 803         /*
 804          * Display the previously rendered picture
 805          */
 806         if( p_picture != NULL )
 807         {
 808             /* Display the direct buffer returned by vout_RenderPicture */
 809             if( p_vout->pf_display )
 810             {
 811                 p_vout->pf_display( p_vout, p_directbuffer );
 812             }
 813
 814             /* Reinitialize idle loop count */
 815             i_idle_loops = 0;
 816
 817             /* Tell the vout this was the last picture and that it does not
 818              * need to be forced anymore. */
 819             p_last_picture = p_picture;
 820             p_last_picture->b_force = 0;
 821         }
 822
 823         /*
 824          * Check events and manage thread
 825          */
 826         if( p_vout->pf_manage && p_vout->pf_manage( p_vout ) )
 827         {
 828             /* A fatal error occured, and the thread must terminate
 829              * immediately, without displaying anything - setting b_error to 1
 830              * causes the immediate end of the main while() loop. */
 831             p_vout->b_error = 1;
 832         }
 833
 834         if( p_vout->i_changes & VOUT_SIZE_CHANGE )
 835         {
 836             /* this must only happen when the vout plugin is incapable of
 837              * rescaling the picture itself. In this case we need to destroy
 838              * the current picture buffers and recreate new ones with the right
 839              * dimensions */
 840             int i;
 841
 842             p_vout->i_changes &= ~VOUT_SIZE_CHANGE;
 843
 844             p_vout->pf_end( p_vout );
 845             for( i = 0; i < I_OUTPUTPICTURES; i++ )
 846                  p_vout->p_picture[ i ].i_status = FREE_PICTURE;
 847
 848             I_OUTPUTPICTURES = 0;
 849             if( p_vout->pf_init( p_vout ) )
 850             {
 851                 msg_Err( p_vout, "cannot resize display" );
 852                 /* FIXME: pf_end will be called again in EndThread() */
 853                 p_vout->b_error = 1;
 854             }
 855
 856             /* Need to reinitialise the chroma plugin */
 857             p_vout->chroma.p_module->pf_deactivate( VLC_OBJECT(p_vout) );
 858             p_vout->chroma.p_module->pf_activate( VLC_OBJECT(p_vout) );
 859         }
 860     }
 861
 862     /*
 863      * Error loop - wait until the thread destruction is requested
 864      */
 865     if( p_vout->b_error )
 866     {
 867         ErrorThread( p_vout );
 868     }
 869
 870     /* End of thread */
 871     EndThread( p_vout );
 872
 873     /* Destroy thread structures allocated by CreateThread */
 874     DestroyThread( p_vout );
 875 }
 876
 877 /*****************************************************************************
 878  * ErrorThread: RunThread() error loop
 879  *****************************************************************************
 880  * This function is called when an error occured during thread main's loop. The
 881  * thread can still receive feed, but must be ready to terminate as soon as
 882  * possible.
 883  *****************************************************************************/
 884 static void ErrorThread( vout_thread_t *p_vout )
 885 {
 886     /* Wait until a `die' order */
 887     while( !p_vout->b_die )
 888     {
 889         /* Sleep a while */
 890         msleep( VOUT_IDLE_SLEEP );
 891     }
 892 }
 893
 894 /*****************************************************************************
 895  * EndThread: thread destruction
 896  *****************************************************************************
 897  * This function is called when the thread ends after a sucessful
 898  * initialization. It frees all ressources allocated by InitThread.
 899  *****************************************************************************/
 900 static void EndThread( vout_thread_t *p_vout )
 901 {
 902     int     i_index;                                        /* index in heap */
 903
 904 #ifdef STATS
 905     {
 906         struct tms cpu_usage;
 907         times( &cpu_usage );
 908
 909         msg_Dbg( p_vout, "cpu usage (user: %d, system: %d)",
 910                  cpu_usage.tms_utime, cpu_usage.tms_stime );
 911     }
 912 #endif
 913
 914     if( !p_vout->b_direct )
 915     {
 916         module_Unneed( p_vout, p_vout->chroma.p_module );
 917     }
 918
 919     /* Destroy all remaining pictures */
 920     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++ )
 921     {
 922         if ( p_vout->p_picture[i_index].i_type == MEMORY_PICTURE )
 923         {
 924             free( p_vout->p_picture[i_index].p_data_orig );
 925         }
 926     }
 927
 928     /* Destroy all remaining subpictures */
 929     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++ )
 930     {
 931         if( p_vout->p_subpicture[i_index].i_status != FREE_SUBPICTURE )
 932         {
 933             vout_DestroySubPicture( p_vout,
 934                                     &p_vout->p_subpicture[i_index] );
 935         }
 936     }
 937
 938     /* Destroy translation tables */
 939     p_vout->pf_end( p_vout );
 940
 941     /* Release the change lock */
 942     vlc_mutex_unlock( &p_vout->change_lock );
 943 }
 944
 945 /*****************************************************************************
 946  * DestroyThread: thread destruction
 947  *****************************************************************************
 948  * This function is called when the thread ends. It frees all ressources
 949  * allocated by CreateThread. Status is available at this stage.
 950  *****************************************************************************/
 951 static void DestroyThread( vout_thread_t *p_vout )
 952 {
 953     /* Destroy the locks */
 954     vlc_mutex_destroy( &p_vout->picture_lock );
 955     vlc_mutex_destroy( &p_vout->subpicture_lock );
 956     vlc_mutex_destroy( &p_vout->change_lock );
 957
 958     /* Release the module */
 959     module_Unneed( p_vout, p_vout->p_module );
 960 }
 961
 962 /* following functions are local */
 963
 964 static int ReduceHeight( int i_ratio )
 965 {
 966     int i_dummy = VOUT_ASPECT_FACTOR;
 967     int i_pgcd  = 1;
 968
 969     if( !i_ratio )
 970     {
 971         return i_pgcd;
 972     }
 973
 974     /* VOUT_ASPECT_FACTOR is (2^7 * 3^3 * 5^3), we just check for 2, 3 and 5 */
 975     while( !(i_ratio & 1) && !(i_dummy & 1) )
 976     {
 977         i_ratio >>= 1;
 978         i_dummy >>= 1;
 979         i_pgcd  <<= 1;
 980     }
 981
 982     while( !(i_ratio % 3) && !(i_dummy % 3) )
 983     {
 984         i_ratio /= 3;
 985         i_dummy /= 3;
 986         i_pgcd  *= 3;
 987     }
 988
 989     while( !(i_ratio % 5) && !(i_dummy % 5) )
 990     {
 991         i_ratio /= 5;
 992         i_dummy /= 5;
 993         i_pgcd  *= 5;
 994     }
 995
 996     return i_pgcd;
 997 }
 998
 999 /*****************************************************************************
1000  * BinaryLog: computes the base 2 log of a binary value
1001  *****************************************************************************
1002  * This functions is used by MaskToShift, to get a bit index from a binary
1003  * value.
1004  *****************************************************************************/
1005 static int BinaryLog( uint32_t i )
1006 {
1007     int i_log = 0;
1008
1009     if( i == 0 ) return -31337;
1010
1011     if( i & 0xffff0000 ) i_log += 16;
1012     if( i & 0xff00ff00 ) i_log += 8;
1013     if( i & 0xf0f0f0f0 ) i_log += 4;
1014     if( i & 0xcccccccc ) i_log += 2;
1015     if( i & 0xaaaaaaaa ) i_log += 1;
1016
1017     return i_log;
1018 }
1019
1020 /*****************************************************************************
1021  * MaskToShift: transform a color mask into right and left shifts
1022  *****************************************************************************
1023  * This function is used for obtaining color shifts from masks.
1024  *****************************************************************************/
1025 static void MaskToShift( int *pi_left, int *pi_right, uint32_t i_mask )
1026 {
1027     uint32_t i_low, i_high;            /* lower hand higher bits of the mask */
1028
1029     if( !i_mask )
1030     {
1031         *pi_left = *pi_right = 0;
1032         return;
1033     }
1034
1035     /* Get bits */
1036     i_low =  i_mask & (- (int32_t)i_mask);          /* lower bit of the mask */
1037     i_high = i_mask + i_low;                       /* higher bit of the mask */
1038
1039     /* Transform bits into an index */
1040     i_low =  BinaryLog (i_low);
1041     i_high = BinaryLog (i_high);
1042
1043     /* Update pointers and return */
1044     *pi_left =   i_low;
1045     *pi_right = (8 - i_high + i_low);
1046 }
1047
1048 /*****************************************************************************
1049  * InitWindowSize: find the initial dimensions the video window should have.
1050  *****************************************************************************
1051  * This function will check the "width", "height" and "zoom" config options and
1052  * will calculate the size that the video window should have.
1053  *****************************************************************************/
1054 static void InitWindowSize( vout_thread_t *p_vout, int *pi_width,
1055                             int *pi_height )
1056 {
1057     int i_width, i_height;
1058     uint64_t ll_zoom;
1059
1060 #define FP_FACTOR 1000                             /* our fixed point factor */
1061
1062     i_width = config_GetInt( p_vout, "width" );
1063     i_height = config_GetInt( p_vout, "height" );
1064     ll_zoom = (uint64_t)( FP_FACTOR * config_GetFloat( p_vout, "zoom" ) );
1065
1066     if( (i_width >= 0) && (i_height >= 0))
1067     {
1068         *pi_width = (int)( i_width * ll_zoom / FP_FACTOR );
1069         *pi_height = (int)( i_height * ll_zoom / FP_FACTOR );
1070         return;
1071     }
1072     else if( i_width >= 0 )
1073     {
1074         *pi_width = (int)( i_width * ll_zoom / FP_FACTOR );
1075         *pi_height = (int)( i_width * ll_zoom * VOUT_ASPECT_FACTOR /
1076                             p_vout->render.i_aspect / FP_FACTOR );
1077         return;
1078     }
1079     else if( i_height >= 0 )
1080     {
1081         *pi_height = (int)( i_height * ll_zoom / FP_FACTOR );
1082         *pi_width = (int)( i_height * ll_zoom * p_vout->render.i_aspect /
1083                            VOUT_ASPECT_FACTOR / FP_FACTOR );
1084         return;
1085     }
1086
1087     if( p_vout->render.i_height * p_vout->render.i_aspect
1088         >= p_vout->render.i_width * VOUT_ASPECT_FACTOR )
1089     {
1090         *pi_width = (int)( p_vout->render.i_height * ll_zoom
1091           * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR / FP_FACTOR );
1092         *pi_height = (int)( p_vout->render.i_height * ll_zoom / FP_FACTOR );
1093     }
1094     else
1095     {
1096         *pi_width = (int)( p_vout->render.i_width * ll_zoom / FP_FACTOR );
1097         *pi_height = (int)( p_vout->render.i_width * ll_zoom
1098           * VOUT_ASPECT_FACTOR / p_vout->render.i_aspect / FP_FACTOR );
1099     }
1100
1101 #undef FP_FACTOR
1102 }
1103
1104 /*****************************************************************************
1105  * vout_VarCallback: generic callback for intf variables
1106  *****************************************************************************/
1107 int vout_VarCallback( vlc_object_t * p_this, const char * psz_variable,
1108                       vlc_value_t old_value, vlc_value_t new_value,
1109                       void * unused )
1110 {
1111     vout_thread_t * p_vout = (vout_thread_t *)p_this;
1112     vlc_value_t val;
1113     val.b_bool = 1;
1114     var_Set( p_vout, "intf-change", val );
1115     return 0;
1116 }