git.sesse.net Git - vlc/blob - src/misc/filter_chain.c

   1 /*****************************************************************************
   2  * filter_chain.c : Handle chains of filter_t objects.
   3  *****************************************************************************
   4  * Copyright (C) 2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Author: Antoine Cellerier <dionoea at videolan dot org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include <vlc_filter.h>
  29 #include <vlc_osd.h>
  30 #include <libvlc.h>
  31 #include <assert.h>
  32
  33 typedef struct
  34 {
  35     int (*pf_init)( filter_t *, void *p_data ); /* Callback called once filter allocation has succeeded to initialize the filter's buffer allocation callbacks. This function is responsible for setting p_owner if needed. */
  36     void (* pf_clean)( filter_t * ); /* Callback called on filter removal from chain to clean up buffer allocation callbacks data (ie p_owner) */
  37     void *p_data; /* Data for pf_buffer_allocation_init */
  38
  39 } filter_chain_allocator_t;
  40
  41 typedef struct chained_filter_t
  42 {
  43     /* Public part of the filter structure */
  44     filter_t filter;
  45     /* Private filter chain data (shhhh!) */
  46     struct chained_filter_t *prev, *next;
  47     vlc_mouse_t *mouse;
  48 } chained_filter_t;
  49
  50 /* Only use this with filter objects from _this_ C module */
  51 static inline chained_filter_t *chained (filter_t *filter)
  52 {
  53     return (chained_filter_t *)filter;
  54 }
  55
  56 static int  AllocatorInit( const filter_chain_allocator_t *,
  57                            chained_filter_t * );
  58 static void AllocatorClean( const filter_chain_allocator_t *,
  59                             chained_filter_t * );
  60
  61 static bool IsInternalVideoAllocator( chained_filter_t * );
  62
  63 static int  InternalVideoInit( filter_t *, void * );
  64 static void InternalVideoClean( filter_t * );
  65
  66 static const filter_chain_allocator_t internal_video_allocator = {
  67     .pf_init = InternalVideoInit,
  68     .pf_clean = InternalVideoClean,
  69     .p_data = NULL,
  70 };
  71
  72 /* */
  73 struct filter_chain_t
  74 {
  75     vlc_object_t *p_this; /**< Owner object */
  76     filter_chain_allocator_t allocator; /**< Owner allocation callbacks */
  77
  78     chained_filter_t *first, *last; /**< List of filters */
  79
  80     es_format_t fmt_in; /**< Chain input format (constant) */
  81     es_format_t fmt_out; /**< Chain current output format */
  82     unsigned length; /**< Number of filters */
  83     bool b_allow_fmt_out_change; /**< Can the output format be changed? */
  84     char psz_capability[1]; /**< Module capability for all chained filters */
  85 };
  86
  87 /**
  88  * Local prototypes
  89  */
  90 static filter_t *filter_chain_AppendFilterInternal( filter_chain_t *,
  91                                                     const char *, config_chain_t *,
  92                                                     const es_format_t *, const es_format_t * );
  93
  94 static int filter_chain_AppendFromStringInternal( filter_chain_t *, const char * );
  95
  96 static int filter_chain_DeleteFilterInternal( filter_chain_t *, filter_t * );
  97
  98 static int UpdateBufferFunctions( filter_chain_t * );
  99
 100 #undef filter_chain_New
 101 /**
 102  * Filter chain initialisation
 103  */
 104 filter_chain_t *filter_chain_New( vlc_object_t *p_this,
 105                                   const char *psz_capability,
 106                                   bool b_allow_fmt_out_change,
 107                                   int  (*pf_buffer_allocation_init)( filter_t *, void * ),
 108                                   void (*pf_buffer_allocation_clean)( filter_t * ),
 109                                   void *p_buffer_allocation_data )
 110 {
 111     assert( p_this );
 112     assert( psz_capability );
 113
 114     size_t size = sizeof(filter_chain_t) + strlen(psz_capability);
 115     filter_chain_t *p_chain = malloc( size );
 116     if( !p_chain )
 117         return NULL;
 118
 119     p_chain->p_this = p_this;
 120     p_chain->last = p_chain->first = NULL;
 121     p_chain->length = 0;
 122     strcpy( p_chain->psz_capability, psz_capability );
 123
 124     es_format_Init( &p_chain->fmt_in, UNKNOWN_ES, 0 );
 125     es_format_Init( &p_chain->fmt_out, UNKNOWN_ES, 0 );
 126     p_chain->b_allow_fmt_out_change = b_allow_fmt_out_change;
 127
 128     p_chain->allocator.pf_init = pf_buffer_allocation_init;
 129     p_chain->allocator.pf_clean = pf_buffer_allocation_clean;
 130     p_chain->allocator.p_data = p_buffer_allocation_data;
 131
 132     return p_chain;
 133 }
 134
 135 /**
 136  * Filter chain destruction
 137  */
 138 void filter_chain_Delete( filter_chain_t *p_chain )
 139 {
 140     filter_chain_Reset( p_chain, NULL, NULL );
 141
 142     es_format_Clean( &p_chain->fmt_in );
 143     es_format_Clean( &p_chain->fmt_out );
 144
 145     free( p_chain );
 146 }
 147 /**
 148  * Filter chain reinitialisation
 149  */
 150 void filter_chain_Reset( filter_chain_t *p_chain, const es_format_t *p_fmt_in,
 151                          const es_format_t *p_fmt_out )
 152 {
 153     filter_t *p_filter;
 154
 155     while( (p_filter = &p_chain->first->filter) != NULL )
 156         filter_chain_DeleteFilterInternal( p_chain, p_filter );
 157
 158     if( p_fmt_in )
 159     {
 160         es_format_Clean( &p_chain->fmt_in );
 161         es_format_Copy( &p_chain->fmt_in, p_fmt_in );
 162     }
 163     if( p_fmt_out )
 164     {
 165         es_format_Clean( &p_chain->fmt_out );
 166         es_format_Copy( &p_chain->fmt_out, p_fmt_out );
 167     }
 168 }
 169
 170 filter_t *filter_chain_AppendFilter( filter_chain_t *p_chain,
 171                                      const char *psz_name,
 172                                      config_chain_t *p_cfg,
 173                                      const es_format_t *p_fmt_in,
 174                                      const es_format_t *p_fmt_out )
 175 {
 176     filter_t *p_filter = filter_chain_AppendFilterInternal( p_chain, psz_name,
 177                                                             p_cfg, p_fmt_in,
 178                                                             p_fmt_out );
 179     if( UpdateBufferFunctions( p_chain ) < 0 )
 180         msg_Err( p_filter, "Woah! This doesn't look good." );
 181     return p_filter;
 182 }
 183
 184 int filter_chain_AppendFromString( filter_chain_t *p_chain,
 185                                    const char *psz_string )
 186 {
 187     const int i_ret = filter_chain_AppendFromStringInternal( p_chain, psz_string );
 188     if( i_ret < 0 )
 189         return i_ret;
 190
 191     /* FIXME That one seems bad if a error is returned */
 192     return UpdateBufferFunctions( p_chain );
 193 }
 194
 195 int filter_chain_DeleteFilter( filter_chain_t *p_chain, filter_t *p_filter )
 196 {
 197     const int i_ret = filter_chain_DeleteFilterInternal( p_chain, p_filter );
 198     if( i_ret < 0 )
 199         return i_ret;
 200
 201     /* FIXME That one seems bad if a error is returned */
 202     return UpdateBufferFunctions( p_chain );
 203 }
 204
 205 int filter_chain_GetLength( filter_chain_t *p_chain )
 206 {
 207     return p_chain->length;
 208 }
 209
 210 const es_format_t *filter_chain_GetFmtOut( filter_chain_t *p_chain )
 211 {
 212
 213     if( p_chain->b_allow_fmt_out_change )
 214         return &p_chain->fmt_out;
 215
 216     if( p_chain->last != NULL )
 217         return &p_chain->last->filter.fmt_out;
 218
 219     /* Unless filter_chain_Reset has been called we are doomed */
 220     return &p_chain->fmt_out;
 221 }
 222
 223 picture_t *filter_chain_VideoFilter( filter_chain_t *p_chain, picture_t *p_pic )
 224 {
 225     for( chained_filter_t *f = p_chain->first; f != NULL; f = f->next )
 226     {
 227         filter_t *p_filter = &f->filter;
 228
 229         p_pic = p_filter->pf_video_filter( p_filter, p_pic );
 230         if( !p_pic )
 231             break;
 232     }
 233     return p_pic;
 234 }
 235
 236 block_t *filter_chain_AudioFilter( filter_chain_t *p_chain, block_t *p_block )
 237 {
 238     for( chained_filter_t *f = p_chain->first; f != NULL; f = f->next )
 239     {
 240         filter_t *p_filter = &f->filter;
 241
 242         p_block = p_filter->pf_audio_filter( p_filter, p_block );
 243         if( !p_block )
 244             break;
 245     }
 246     return p_block;
 247 }
 248
 249 void filter_chain_SubFilter( filter_chain_t *p_chain,
 250                              mtime_t display_date )
 251 {
 252     for( chained_filter_t *f = p_chain->first; f != NULL; f = f->next )
 253     {
 254         filter_t *p_filter = &f->filter;
 255         subpicture_t *p_subpic = p_filter->pf_sub_filter( p_filter, display_date );
 256         /* XXX I find that spu_t cast ugly */
 257         if( p_subpic )
 258             spu_DisplaySubpicture( (spu_t*)p_chain->p_this, p_subpic );
 259     }
 260 }
 261
 262 int filter_chain_MouseFilter( filter_chain_t *p_chain, vlc_mouse_t *p_dst, const vlc_mouse_t *p_src )
 263 {
 264     vlc_mouse_t current = *p_src;
 265
 266     for( chained_filter_t *f = p_chain->first; f != NULL; f = f->next )
 267     {
 268         filter_t *p_filter = &f->filter;
 269         vlc_mouse_t *p_mouse = f->mouse;
 270
 271         if( p_filter->pf_video_mouse && p_mouse )
 272         {
 273             vlc_mouse_t old = *p_mouse;
 274             vlc_mouse_t filtered;
 275
 276             *p_mouse = current;
 277             if( p_filter->pf_video_mouse( p_filter, &filtered, &old, &current ) )
 278                 return VLC_EGENERIC;
 279             current = filtered;
 280         }
 281     }
 282
 283     *p_dst = current;
 284     return VLC_SUCCESS;
 285 }
 286
 287
 288 /* Helpers */
 289 static filter_t *filter_chain_AppendFilterInternal( filter_chain_t *p_chain,
 290                                                     const char *psz_name,
 291                                                     config_chain_t *p_cfg,
 292                                                     const es_format_t *p_fmt_in,
 293                                                     const es_format_t *p_fmt_out )
 294 {
 295     chained_filter_t *p_chained =
 296         vlc_custom_create( p_chain->p_this, sizeof(*p_chained),
 297                            VLC_OBJECT_GENERIC, "filter" );
 298     filter_t *p_filter = &p_chained->filter;
 299     if( !p_filter )
 300         return NULL;
 301     vlc_object_attach( p_filter, p_chain->p_this );
 302
 303     if( !p_fmt_in )
 304     {
 305         if( p_chain->last != NULL )
 306             p_fmt_in = &p_chain->last->filter.fmt_out;
 307         else
 308             p_fmt_in = &p_chain->fmt_in;
 309     }
 310
 311     if( !p_fmt_out )
 312     {
 313         p_fmt_out = &p_chain->fmt_out;
 314     }
 315
 316     es_format_Copy( &p_filter->fmt_in, p_fmt_in );
 317     es_format_Copy( &p_filter->fmt_out, p_fmt_out );
 318     p_filter->p_cfg = p_cfg;
 319     p_filter->b_allow_fmt_out_change = p_chain->b_allow_fmt_out_change;
 320
 321     p_filter->p_module = module_need( p_filter, p_chain->psz_capability,
 322                                       psz_name, psz_name != NULL );
 323
 324     if( !p_filter->p_module )
 325         goto error;
 326
 327     if( p_filter->b_allow_fmt_out_change )
 328     {
 329         es_format_Clean( &p_chain->fmt_out );
 330         es_format_Copy( &p_chain->fmt_out, &p_filter->fmt_out );
 331     }
 332
 333     if( AllocatorInit( &p_chain->allocator, p_chained ) )
 334         goto error;
 335
 336     if( p_chain->last == NULL )
 337     {
 338         assert( p_chain->first == NULL );
 339         p_chain->first = p_chained;
 340     }
 341     else
 342         p_chain->last->next = p_chained;
 343     p_chained->prev = p_chain->last;
 344     p_chain->last = p_chained;
 345     p_chained->next = NULL;
 346     p_chain->length++;
 347
 348     vlc_mouse_t *p_mouse = malloc( sizeof(*p_mouse) );
 349     if( p_mouse )
 350         vlc_mouse_Init( p_mouse );
 351     p_chained->mouse = p_mouse;
 352
 353     msg_Dbg( p_chain->p_this, "Filter '%s' (%p) appended to chain",
 354              psz_name ? psz_name : module_get_name(p_filter->p_module, false),
 355              p_filter );
 356
 357     return p_filter;
 358
 359 error:
 360     if( psz_name )
 361         msg_Err( p_chain->p_this, "Failed to create %s '%s'",
 362                  p_chain->psz_capability, psz_name );
 363     else
 364         msg_Err( p_chain->p_this, "Failed to create %s",
 365                  p_chain->psz_capability );
 366     if( p_filter->p_module )
 367         module_unneed( p_filter, p_filter->p_module );
 368     es_format_Clean( &p_filter->fmt_in );
 369     es_format_Clean( &p_filter->fmt_out );
 370     vlc_object_release( p_filter );
 371     return NULL;
 372 }
 373
 374
 375 static int filter_chain_AppendFromStringInternal( filter_chain_t *p_chain,
 376                                                   const char *psz_string )
 377 {
 378     config_chain_t *p_cfg = NULL;
 379     char *psz_name = NULL;
 380     char* psz_new_string;
 381
 382     if( !psz_string || !*psz_string )
 383         return 0;
 384
 385     psz_new_string = config_ChainCreate( &psz_name, &p_cfg, psz_string );
 386
 387     filter_t *p_filter = filter_chain_AppendFilterInternal( p_chain, psz_name,
 388                                                             p_cfg, NULL, NULL );
 389     if( !p_filter )
 390     {
 391         msg_Err( p_chain->p_this, "Failed while trying to append '%s' "
 392                  "to filter chain", psz_name );
 393         free( psz_name );
 394         free( p_cfg );
 395         free( psz_new_string );
 396         return -1;
 397     }
 398     free( psz_name );
 399
 400     const int i_ret = filter_chain_AppendFromStringInternal( p_chain, psz_new_string );
 401     free( psz_new_string );
 402     if( i_ret < 0 )
 403     {
 404         filter_chain_DeleteFilterInternal( p_chain, p_filter );
 405         return i_ret;
 406     }
 407     return 1 + i_ret;
 408 }
 409
 410 static int filter_chain_DeleteFilterInternal( filter_chain_t *p_chain,
 411                                               filter_t *p_filter )
 412 {
 413     chained_filter_t *p_chained = chained( p_filter );
 414
 415     /* Remove it from the chain */
 416     if( p_chained->prev != NULL )
 417         p_chained->prev->next = p_chained->next;
 418     else
 419     {
 420         assert( p_chained == p_chain->first );
 421         p_chain->first = p_chained->next;
 422     }
 423
 424     if( p_chained->next != NULL )
 425         p_chained->next->prev = p_chained->prev;
 426     else
 427     {
 428         assert( p_chained == p_chain->last );
 429         p_chain->last = p_chained->prev;
 430     }
 431     p_chain->length--;
 432
 433     msg_Dbg( p_chain->p_this, "Filter %p removed from chain", p_filter );
 434
 435     /* Destroy the filter object */
 436     if( IsInternalVideoAllocator( p_chained ) )
 437         AllocatorClean( &internal_video_allocator, p_chained );
 438     else
 439         AllocatorClean( &p_chain->allocator, p_chained );
 440
 441     if( p_filter->p_module )
 442         module_unneed( p_filter, p_filter->p_module );
 443     free( p_chained->mouse );
 444     vlc_object_release( p_filter );
 445
 446
 447     /* FIXME: check fmt_in/fmt_out consitency */
 448     return VLC_SUCCESS;
 449 }
 450
 451 /**
 452  * Internal chain buffer handling
 453  */
 454
 455 static int UpdateVideoBufferFunctions( filter_chain_t *p_chain )
 456 {
 457     /**
 458      * Last filter uses the filter chain's parent buffer allocation
 459      * functions. All the other filters use internal functions.
 460      * This makes it possible to have format changes between each
 461      * filter without having to worry about the parent's picture
 462      * heap format.
 463      */
 464     /* FIXME: we should only update the last and penultimate filters */
 465     chained_filter_t *f;
 466
 467     for( f = p_chain->first; f != p_chain->last; f = f->next )
 468     {
 469         if( !IsInternalVideoAllocator( f ) )
 470         {
 471             AllocatorClean( &p_chain->allocator, f );
 472
 473             AllocatorInit( &internal_video_allocator, f );
 474         }
 475     }
 476
 477     if( f != NULL )
 478     {
 479         if( IsInternalVideoAllocator( f ) )
 480         {
 481             AllocatorClean( &internal_video_allocator, f );
 482
 483             if( AllocatorInit( &p_chain->allocator, f ) )
 484                 return VLC_EGENERIC;
 485         }
 486     }
 487     return VLC_SUCCESS;
 488 }
 489
 490 /**
 491  * This function should be called after every filter chain change
 492  */
 493 static int UpdateBufferFunctions( filter_chain_t *p_chain )
 494 {
 495     if( !strcmp( p_chain->psz_capability, "video filter2" ) )
 496         return UpdateVideoBufferFunctions( p_chain );
 497
 498     return VLC_SUCCESS;
 499 }
 500
 501 /* Internal video allocator functions */
 502 static picture_t *VideoBufferNew( filter_t *p_filter )
 503 {
 504     const video_format_t *p_fmt = &p_filter->fmt_out.video;
 505
 506     picture_t *p_picture = picture_NewFromFormat( p_fmt );
 507     if( !p_picture )
 508         msg_Err( p_filter, "Failed to allocate picture" );
 509     return p_picture;
 510 }
 511 static void VideoBufferDelete( filter_t *p_filter, picture_t *p_picture )
 512 {
 513     VLC_UNUSED( p_filter );
 514     picture_Release( p_picture );
 515 }
 516 static int InternalVideoInit( filter_t *p_filter, void *p_data )
 517 {
 518     VLC_UNUSED(p_data);
 519
 520     p_filter->pf_video_buffer_new = VideoBufferNew;
 521     p_filter->pf_video_buffer_del = VideoBufferDelete;
 522
 523     return VLC_SUCCESS;
 524 }
 525 static void InternalVideoClean( filter_t *p_filter )
 526 {
 527     p_filter->pf_video_buffer_new = NULL;
 528     p_filter->pf_video_buffer_del = NULL;
 529 }
 530
 531 static bool IsInternalVideoAllocator( chained_filter_t *p_filter )
 532 {
 533     return p_filter->filter.pf_video_buffer_new == VideoBufferNew;
 534 }
 535
 536 /* */
 537 static int AllocatorInit( const filter_chain_allocator_t *p_alloc,
 538                           chained_filter_t *p_filter )
 539 {
 540     if( p_alloc->pf_init )
 541         return p_alloc->pf_init( &p_filter->filter, p_alloc->p_data );
 542     return VLC_SUCCESS;
 543 }
 544
 545 static void AllocatorClean( const filter_chain_allocator_t *p_alloc,
 546                             chained_filter_t *p_filter )
 547 {
 548     if( p_alloc->pf_clean )
 549         p_alloc->pf_clean( &p_filter->filter );
 550 }
 551