modules/stream_out/bridge.c

   1 /*****************************************************************************
   2  * bridge.c: bridge stream output module
   3  *****************************************************************************
   4  * Copyright (C) 2005-2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *          Antoine Cellerier <dionoea at videolan dot org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_sout.h>
  36 #include <vlc_block.h>
  37
  38 /*****************************************************************************
  39  * Module descriptor
  40  *****************************************************************************/
  41 #define ID_TEXT N_("ID")
  42 #define ID_LONGTEXT N_( \
  43     "Integer identifier for this elementary stream. This will be used to " \
  44     "\"find\" this stream later." )
  45
  46 #define DEST_TEXT N_( "Destination bridge-in name" )
  47 #define DEST_LONGTEXT N_( \
  48     "Name of the destination bridge-in. If you do not need more " \
  49     "than one bridge-in at a time, you can discard this option." )
  50
  51 #define DELAY_TEXT N_("Delay")
  52 #define DELAY_LONGTEXT N_("Pictures coming from the picture video outputs " \
  53         "will be delayed according to this value (in milliseconds, should be "\
  54         ">= 100 ms). For high values, you will need to raise caching values." )
  55
  56 #define ID_OFFSET_TEXT N_("ID Offset")
  57 #define ID_OFFSET_LONGTEXT N_("Offset to add to the stream IDs specified in " \
  58         "bridge_out to obtain the stream IDs bridge_in will register.")
  59
  60 #define NAME_TEXT N_( "Name of current instance" )
  61 #define NAME_LONGTEXT N_( \
  62     "Name of this bridge-in instance. If you do not need more " \
  63     "than one bridge-in at a time, you can discard this option." )
  64
  65 #define PLACEHOLDER_TEXT N_( "Fallback to placeholder stream when out of data" )
  66 #define PLACEHOLDER_LONGTEXT N_( \
  67     "If set to true, the bridge will discard all input elementary streams " \
  68     "except if it doesn't receive data from another bridge-in. This can " \
  69     "be used to configure a place holder stream when the real source " \
  70     "breaks. Source and placeholder streams should have the same format. " )
  71
  72 #define PLACEHOLDER_DELAY_TEXT N_( "Placeholder delay" )
  73 #define PLACEHOLDER_DELAY_LONGTEXT N_( \
  74     "Delay (in ms) before the placeholder kicks in." )
  75
  76 #define PLACEHOLDER_IFRAME_TEXT N_( "Wait for I frame before toggling placholder" )
  77 #define PLACEHOLDER_IFRAME_LONGTEXT N_( \
  78     "If enabled, switching between the placeholder and the normal stream " \
  79     "will only occur on I frames. This will remove artifacts on stream " \
  80     "switching at the expense of a slightly longer delay, depending on " \
  81     "the frequence of I frames in the streams." )
  82
  83 static int  OpenOut ( vlc_object_t * );
  84 static void CloseOut( vlc_object_t * );
  85 static int  OpenIn  ( vlc_object_t * );
  86 static void CloseIn ( vlc_object_t * );
  87
  88 #define SOUT_CFG_PREFIX_OUT "sout-bridge-out-"
  89 #define SOUT_CFG_PREFIX_IN "sout-bridge-in-"
  90
  91 vlc_module_begin ()
  92     set_shortname( N_("Bridge"))
  93     set_description( N_("Bridge stream output"))
  94     add_submodule ()
  95     set_section( N_("Bridge out"), NULL )
  96     set_capability( "sout stream", 50 )
  97     add_shortcut( "bridge-out" )
  98     /* Only usable with VLM. No category so not in gui preferences
  99     set_category( CAT_SOUT )
 100     set_subcategory( SUBCAT_SOUT_STREAM )*/
 101     add_integer( SOUT_CFG_PREFIX_OUT "id", 0, ID_TEXT, ID_LONGTEXT,
 102                  false )
 103     add_string( SOUT_CFG_PREFIX_OUT "in-name", "default",
 104                 DEST_TEXT, DEST_LONGTEXT, false )
 105     set_callbacks( OpenOut, CloseOut )
 106
 107     add_submodule ()
 108     set_section( N_("Bridge in"), NULL )
 109     set_capability( "sout stream", 50 )
 110     add_shortcut( "bridge-in" )
 111     /*set_category( CAT_SOUT )
 112     set_subcategory( SUBCAT_SOUT_STREAM )*/
 113     add_integer( SOUT_CFG_PREFIX_IN "delay", 0, DELAY_TEXT,
 114                  DELAY_LONGTEXT, false )
 115     add_integer( SOUT_CFG_PREFIX_IN "id-offset", 8192, ID_OFFSET_TEXT,
 116                  ID_OFFSET_LONGTEXT, false )
 117     add_string( SOUT_CFG_PREFIX_IN "name", "default",
 118                 NAME_TEXT, NAME_LONGTEXT, false )
 119     add_bool( SOUT_CFG_PREFIX_IN "placeholder", false, NULL,
 120               PLACEHOLDER_TEXT, PLACEHOLDER_LONGTEXT, false )
 121     add_integer( SOUT_CFG_PREFIX_IN "placeholder-delay", 200,
 122                  PLACEHOLDER_DELAY_TEXT, PLACEHOLDER_DELAY_LONGTEXT, false )
 123     add_bool( SOUT_CFG_PREFIX_IN "placeholder-switch-on-iframe", true, NULL,
 124               PLACEHOLDER_IFRAME_TEXT, PLACEHOLDER_IFRAME_LONGTEXT, false )
 125     set_callbacks( OpenIn, CloseIn )
 126
 127 vlc_module_end ()
 128
 129
 130 /*****************************************************************************
 131  * Local prototypes
 132  *****************************************************************************/
 133 static const char *const ppsz_sout_options_out[] = {
 134     "id", "in-name", NULL
 135 };
 136
 137 static const char *const ppsz_sout_options_in[] = {
 138     "delay", "id-offset", "name",
 139     "placeholder", "placeholder-delay", "placeholder-switch-on-iframe",
 140     NULL
 141 };
 142
 143 static sout_stream_id_t *AddOut ( sout_stream_t *, es_format_t * );
 144 static int               DelOut ( sout_stream_t *, sout_stream_id_t * );
 145 static int               SendOut( sout_stream_t *, sout_stream_id_t *, block_t * );
 146
 147 static sout_stream_id_t *AddIn ( sout_stream_t *, es_format_t * );
 148 static int               DelIn ( sout_stream_t *, sout_stream_id_t * );
 149 static int               SendIn( sout_stream_t *, sout_stream_id_t *, block_t * );
 150
 151 typedef struct bridged_es_t
 152 {
 153     es_format_t fmt;
 154     block_t *p_block;
 155     block_t **pp_last;
 156     bool b_empty;
 157
 158     /* bridge in part */
 159     sout_stream_id_t *id;
 160     mtime_t i_last;
 161     bool b_changed;
 162 } bridged_es_t;
 163
 164 typedef struct bridge_t
 165 {
 166     bridged_es_t **pp_es;
 167     int i_es_num;
 168 } bridge_t;
 169
 170
 171 /*
 172  * Bridge out
 173  */
 174
 175 typedef struct out_sout_stream_sys_t
 176 {
 177     vlc_mutex_t *p_lock;
 178     bridged_es_t *p_es;
 179     int i_id;
 180     bool b_inited;
 181
 182     char *psz_name;
 183 } out_sout_stream_sys_t;
 184
 185 /*****************************************************************************
 186  * OpenOut:
 187  *****************************************************************************/
 188 static int OpenOut( vlc_object_t *p_this )
 189 {
 190     sout_stream_t     *p_stream = (sout_stream_t *)p_this;
 191     out_sout_stream_sys_t *p_sys;
 192     vlc_value_t val;
 193
 194     config_ChainParse( p_stream, SOUT_CFG_PREFIX_OUT, ppsz_sout_options_out,
 195                    p_stream->p_cfg );
 196
 197     p_sys          = malloc( sizeof( out_sout_stream_sys_t ) );
 198     if( unlikely( !p_sys ) )
 199         return VLC_ENOMEM;
 200     p_sys->b_inited = false;
 201
 202     var_Create( p_this->p_libvlc, "bridge-lock", VLC_VAR_MUTEX );
 203     var_Get( p_this->p_libvlc, "bridge-lock", &val );
 204     p_sys->p_lock = val.p_address;
 205
 206     var_Get( p_stream, SOUT_CFG_PREFIX_OUT "id", &val );
 207     p_sys->i_id = val.i_int;
 208
 209     var_Get( p_stream, SOUT_CFG_PREFIX_OUT "in-name", &val );
 210     if( asprintf( &p_sys->psz_name, "bridge-struct-%s", val.psz_string )<0 )
 211     {
 212         free( val.psz_string );
 213         free( p_sys );
 214         return VLC_ENOMEM;
 215     }
 216     free( val.psz_string );
 217
 218     p_stream->pf_add    = AddOut;
 219     p_stream->pf_del    = DelOut;
 220     p_stream->pf_send   = SendOut;
 221
 222     p_stream->p_sys     = (sout_stream_sys_t *)p_sys;
 223
 224     p_stream->p_sout->i_out_pace_nocontrol++;
 225
 226     return VLC_SUCCESS;
 227 }
 228
 229 /*****************************************************************************
 230  * CloseOut:
 231  *****************************************************************************/
 232 static void CloseOut( vlc_object_t * p_this )
 233 {
 234     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 235     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 236
 237     p_stream->p_sout->i_out_pace_nocontrol--;
 238
 239     free( p_sys->psz_name );
 240     free( p_sys );
 241 }
 242
 243 static sout_stream_id_t * AddOut( sout_stream_t *p_stream, es_format_t *p_fmt )
 244 {
 245     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 246     bridge_t *p_bridge;
 247     bridged_es_t *p_es;
 248     int i;
 249
 250     if ( p_sys->b_inited )
 251     {
 252         msg_Err( p_stream, "bridge-out can only handle 1 es at a time." );
 253         return NULL;
 254     }
 255     p_sys->b_inited = true;
 256
 257     vlc_mutex_lock( p_sys->p_lock );
 258
 259     p_bridge = var_GetAddress( p_stream->p_libvlc, p_sys->psz_name );
 260     if ( p_bridge == NULL )
 261     {
 262         p_bridge = xmalloc( sizeof( bridge_t ) );
 263
 264         var_Create( p_stream->p_libvlc, p_sys->psz_name, VLC_VAR_ADDRESS );
 265         var_SetAddress( p_stream->p_libvlc, p_sys->psz_name, p_bridge );
 266
 267         p_bridge->i_es_num = 0;
 268         p_bridge->pp_es = NULL;
 269     }
 270
 271     for ( i = 0; i < p_bridge->i_es_num; i++ )
 272     {
 273         if ( p_bridge->pp_es[i]->b_empty && !p_bridge->pp_es[i]->b_changed )
 274             break;
 275     }
 276
 277     if ( i == p_bridge->i_es_num )
 278     {
 279         p_bridge->pp_es = xrealloc( p_bridge->pp_es,
 280                           (p_bridge->i_es_num + 1) * sizeof(bridged_es_t *) );
 281         p_bridge->i_es_num++;
 282         p_bridge->pp_es[i] = xmalloc( sizeof(bridged_es_t) );
 283     }
 284
 285     p_sys->p_es = p_es = p_bridge->pp_es[i];
 286
 287     p_es->fmt = *p_fmt;
 288     p_es->fmt.i_id = p_sys->i_id;
 289     p_es->p_block = NULL;
 290     p_es->pp_last = &p_es->p_block;
 291     p_es->b_empty = false;
 292
 293     p_es->id = NULL;
 294     p_es->i_last = VLC_TS_INVALID;
 295     p_es->b_changed = true;
 296
 297     msg_Dbg( p_stream, "bridging out input codec=%4.4s id=%d pos=%d",
 298              (char*)&p_es->fmt.i_codec, p_es->fmt.i_id, i );
 299
 300     vlc_mutex_unlock( p_sys->p_lock );
 301
 302     return (sout_stream_id_t *)p_sys;
 303 }
 304
 305 static int DelOut( sout_stream_t *p_stream, sout_stream_id_t *id )
 306 {
 307     VLC_UNUSED(id);
 308     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 309     bridged_es_t *p_es;
 310
 311     if ( !p_sys->b_inited )
 312     {
 313         return VLC_SUCCESS;
 314     }
 315
 316     vlc_mutex_lock( p_sys->p_lock );
 317
 318     p_es = p_sys->p_es;
 319
 320     p_es->b_empty = true;
 321     block_ChainRelease( p_es->p_block );
 322     p_es->p_block = false;
 323
 324     p_es->b_changed = true;
 325     vlc_mutex_unlock( p_sys->p_lock );
 326
 327     p_sys->b_inited = false;
 328
 329     return VLC_SUCCESS;
 330 }
 331
 332 static int SendOut( sout_stream_t *p_stream, sout_stream_id_t *id,
 333                     block_t *p_buffer )
 334 {
 335     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 336     bridged_es_t *p_es;
 337
 338     if ( (out_sout_stream_sys_t *)id != p_sys )
 339     {
 340         block_ChainRelease( p_buffer );
 341         return VLC_SUCCESS;
 342     }
 343
 344     vlc_mutex_lock( p_sys->p_lock );
 345
 346     p_es = p_sys->p_es;
 347     *p_es->pp_last = p_buffer;
 348     while ( p_buffer != NULL )
 349     {
 350         p_es->pp_last = &p_buffer->p_next;
 351         p_buffer = p_buffer->p_next;
 352     }
 353
 354     vlc_mutex_unlock( p_sys->p_lock );
 355
 356     return VLC_SUCCESS;
 357 }
 358
 359
 360 /*
 361  * Bridge in
 362  */
 363
 364 typedef struct in_sout_stream_sys_t
 365 {
 366     vlc_mutex_t *p_lock;
 367     int i_id_offset;
 368     mtime_t i_delay;
 369
 370     char *psz_name;
 371
 372     bool b_placeholder;
 373     bool b_switch_on_iframe;
 374     int i_state;
 375     mtime_t i_placeholder_delay;
 376     sout_stream_id_t *id_video;
 377     mtime_t i_last_video;
 378     sout_stream_id_t *id_audio;
 379     mtime_t i_last_audio;
 380 } in_sout_stream_sys_t;
 381
 382 enum { placeholder_on, placeholder_off };
 383
 384 /*****************************************************************************
 385  * OpenIn:
 386  *****************************************************************************/
 387 static int OpenIn( vlc_object_t *p_this )
 388 {
 389     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 390     in_sout_stream_sys_t *p_sys;
 391     vlc_value_t val;
 392
 393     p_sys          = malloc( sizeof( in_sout_stream_sys_t ) );
 394     if( unlikely( !p_sys ) )
 395         return VLC_ENOMEM;
 396
 397     if( !p_stream->p_next )
 398     {
 399         msg_Err( p_stream, "cannot create chain" );
 400         free( p_sys );
 401         return VLC_EGENERIC;
 402     }
 403
 404     config_ChainParse( p_stream, SOUT_CFG_PREFIX_IN, ppsz_sout_options_in,
 405                    p_stream->p_cfg );
 406
 407     var_Create( p_this->p_libvlc, "bridge-lock", VLC_VAR_MUTEX );
 408     var_Get( p_this->p_libvlc, "bridge-lock", &val );
 409     p_sys->p_lock = val.p_address;
 410
 411     var_Get( p_stream, SOUT_CFG_PREFIX_IN "id-offset", &val );
 412     p_sys->i_id_offset = val.i_int;
 413
 414     var_Get( p_stream, SOUT_CFG_PREFIX_IN "delay", &val );
 415     p_sys->i_delay = (mtime_t)val.i_int * 1000;
 416
 417     var_Get( p_stream, SOUT_CFG_PREFIX_IN "name", &val );
 418     if( asprintf( &p_sys->psz_name, "bridge-struct-%s", val.psz_string )<0 )
 419     {
 420         free( val.psz_string );
 421         free( p_sys );
 422         return VLC_ENOMEM;
 423     }
 424     free( val.psz_string );
 425
 426     var_Get( p_stream, SOUT_CFG_PREFIX_IN "placeholder", &val );
 427     p_sys->b_placeholder = val.b_bool;
 428
 429     var_Get( p_stream, SOUT_CFG_PREFIX_IN "placeholder-switch-on-iframe", &val);
 430     p_sys->b_switch_on_iframe = val.b_bool;
 431
 432     p_sys->i_state = placeholder_on;
 433
 434     var_Get( p_stream, SOUT_CFG_PREFIX_IN "placeholder-delay", &val );
 435     p_sys->i_placeholder_delay = (mtime_t)val.i_int * 1000;
 436
 437     p_sys->i_last_video = VLC_TS_INVALID;
 438     p_sys->i_last_audio = VLC_TS_INVALID;
 439     p_sys->id_video = NULL;
 440     p_sys->id_audio = NULL;
 441
 442     p_stream->pf_add    = AddIn;
 443     p_stream->pf_del    = DelIn;
 444     p_stream->pf_send   = SendIn;
 445
 446     p_stream->p_sys     = (sout_stream_sys_t *)p_sys;
 447
 448     /* update p_sout->i_out_pace_nocontrol */
 449     p_stream->p_sout->i_out_pace_nocontrol++;
 450
 451     return VLC_SUCCESS;
 452 }
 453
 454 /*****************************************************************************
 455  * CloseIn:
 456  *****************************************************************************/
 457 static void CloseIn( vlc_object_t * p_this )
 458 {
 459     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 460     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 461
 462     p_stream->p_sout->i_out_pace_nocontrol--;
 463
 464     free( p_sys->psz_name );
 465     free( p_sys );
 466 }
 467
 468 struct sout_stream_id_t
 469 {
 470     sout_stream_id_t *id;
 471     int i_cat; /* es category. Used for placeholder option */
 472 };
 473
 474 static sout_stream_id_t * AddIn( sout_stream_t *p_stream, es_format_t *p_fmt )
 475 {
 476     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 477
 478     sout_stream_id_t *id = malloc( sizeof( sout_stream_id_t ) );
 479     if( !id ) return NULL;
 480
 481     id->id = p_stream->p_next->pf_add( p_stream->p_next, p_fmt );
 482     if( !id->id )
 483     {
 484         free( id );
 485         return NULL;
 486     }
 487
 488     if( p_sys->b_placeholder )
 489     {
 490         id->i_cat = p_fmt->i_cat;
 491         switch( p_fmt->i_cat )
 492         {
 493             case VIDEO_ES:
 494                 if( p_sys->id_video != NULL )
 495                     msg_Err( p_stream, "We already had a video es!" );
 496                 p_sys->id_video = id->id;
 497                 break;
 498             case AUDIO_ES:
 499                 if( p_sys->id_audio != NULL )
 500                     msg_Err( p_stream, "We already had an audio es!" );
 501                 p_sys->id_audio = id->id;
 502                 break;
 503         }
 504     }
 505
 506     return id;
 507 }
 508
 509 static int DelIn( sout_stream_t *p_stream, sout_stream_id_t *id )
 510 {
 511     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 512
 513     if( id == p_sys->id_video ) p_sys->id_video = NULL;
 514     if( id == p_sys->id_audio ) p_sys->id_audio = NULL;
 515
 516     int ret = p_stream->p_next->pf_del( p_stream->p_next, id->id );
 517
 518     free( id );
 519     return ret;
 520 }
 521
 522 static int SendIn( sout_stream_t *p_stream, sout_stream_id_t *id,
 523                    block_t *p_buffer )
 524 {
 525     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 526     bridge_t *p_bridge;
 527     bool b_no_es = true;
 528     int i;
 529     int i_date = mdate();
 530
 531     /* First forward the packet for our own ES */
 532     if( !p_sys->b_placeholder )
 533         p_stream->p_next->pf_send( p_stream->p_next, id->id, p_buffer );
 534
 535     /* Then check all bridged streams */
 536     vlc_mutex_lock( p_sys->p_lock );
 537
 538     p_bridge = var_GetAddress( p_stream->p_libvlc, p_sys->psz_name );
 539
 540     if( p_bridge )
 541     {
 542     for ( i = 0; i < p_bridge->i_es_num; i++ )
 543     {
 544         if ( !p_bridge->pp_es[i]->b_empty )
 545             b_no_es = false;
 546
 547         while ( p_bridge->pp_es[i]->p_block != NULL
 548                  && (p_bridge->pp_es[i]->p_block->i_dts + p_sys->i_delay
 549                        < i_date
 550                       || p_bridge->pp_es[i]->p_block->i_dts + p_sys->i_delay
 551                           < p_bridge->pp_es[i]->i_last) )
 552         {
 553             block_t *p_block = p_bridge->pp_es[i]->p_block;
 554             msg_Dbg( p_stream, "dropping a packet (%"PRId64 ")",
 555                      i_date - p_block->i_dts - p_sys->i_delay );
 556             p_bridge->pp_es[i]->p_block
 557                 = p_bridge->pp_es[i]->p_block->p_next;
 558             block_Release( p_block );
 559         }
 560
 561         if ( p_bridge->pp_es[i]->p_block == NULL )
 562         {
 563             p_bridge->pp_es[i]->pp_last = &p_bridge->pp_es[i]->p_block;
 564         }
 565
 566         if ( p_bridge->pp_es[i]->b_changed )
 567         {
 568             if ( p_bridge->pp_es[i]->b_empty && p_bridge->pp_es[i]->id != NULL )
 569             {
 570                 p_stream->p_next->pf_del( p_stream->p_next, p_bridge->pp_es[i]->id );
 571             }
 572             else
 573             {
 574                 /* We need at least two packets to enter the mux. */
 575                 if ( p_bridge->pp_es[i]->p_block == NULL
 576                       || p_bridge->pp_es[i]->p_block->p_next == NULL )
 577                 {
 578                     continue;
 579                 }
 580
 581                 p_bridge->pp_es[i]->fmt.i_id += p_sys->i_id_offset;
 582                 if( !p_sys->b_placeholder )
 583                 {
 584                     p_bridge->pp_es[i]->id = p_stream->p_next->pf_add(
 585                                 p_stream->p_next, &p_bridge->pp_es[i]->fmt );
 586                     if ( p_bridge->pp_es[i]->id == NULL )
 587                     {
 588                         msg_Warn( p_stream, "couldn't create chain for id %d",
 589                                   p_bridge->pp_es[i]->fmt.i_id );
 590                     }
 591                 }
 592                 msg_Dbg( p_stream, "bridging in input codec=%4.4s id=%d pos=%d",
 593                          (char*)&p_bridge->pp_es[i]->fmt.i_codec,
 594                          p_bridge->pp_es[i]->fmt.i_id, i );
 595             }
 596         }
 597         p_bridge->pp_es[i]->b_changed = false;
 598
 599         if ( p_bridge->pp_es[i]->b_empty )
 600             continue;
 601
 602         if ( p_bridge->pp_es[i]->p_block == NULL )
 603         {
 604             if ( p_bridge->pp_es[i]->id != NULL
 605                   && p_bridge->pp_es[i]->i_last < i_date )
 606             {
 607                 if( !p_sys->b_placeholder )
 608                     p_stream->p_next->pf_del( p_stream->p_next,
 609                                           p_bridge->pp_es[i]->id );
 610                 p_bridge->pp_es[i]->fmt.i_id -= p_sys->i_id_offset;
 611                 p_bridge->pp_es[i]->b_changed = true;
 612                 p_bridge->pp_es[i]->id = NULL;
 613             }
 614             continue;
 615         }
 616
 617         if ( p_bridge->pp_es[i]->id != NULL || p_sys->b_placeholder)
 618         {
 619             block_t *p_block = p_bridge->pp_es[i]->p_block;
 620             while ( p_block != NULL )
 621             {
 622                 p_bridge->pp_es[i]->i_last = p_block->i_dts;
 623                 p_block->i_pts += p_sys->i_delay;
 624                 p_block->i_dts += p_sys->i_delay;
 625                 p_block = p_block->p_next;
 626             }
 627             sout_stream_id_t *newid = NULL;
 628             if( p_sys->b_placeholder )
 629             {
 630                 switch( p_bridge->pp_es[i]->fmt.i_cat )
 631                 {
 632                     case VIDEO_ES:
 633                         p_sys->i_last_video = i_date;
 634                         newid = p_sys->id_video;
 635                         if( !newid )
 636                             break;
 637                         if( !p_sys->b_switch_on_iframe ||
 638                             p_sys->i_state == placeholder_off ||
 639                             ( p_bridge->pp_es[i]->fmt.i_cat == VIDEO_ES &&
 640                               p_bridge->pp_es[i]->p_block->i_flags & BLOCK_FLAG_TYPE_I ) )
 641                         {
 642                             p_stream->p_next->pf_send( p_stream->p_next,
 643                                        newid,
 644                                        p_bridge->pp_es[i]->p_block );
 645                             p_sys->i_state = placeholder_off;
 646                         }
 647                         break;
 648                     case AUDIO_ES:
 649                         newid = p_sys->id_audio;
 650                         if( !newid )
 651                             break;
 652                         p_sys->i_last_audio = i_date;
 653                     default:
 654                         p_stream->p_next->pf_send( p_stream->p_next,
 655                                    newid?newid:p_bridge->pp_es[i]->id,
 656                                    p_bridge->pp_es[i]->p_block );
 657                         break;
 658                 }
 659             }
 660             else /* !b_placeholder */
 661                 p_stream->p_next->pf_send( p_stream->p_next,
 662                                        p_bridge->pp_es[i]->id,
 663                                        p_bridge->pp_es[i]->p_block );
 664         }
 665         else
 666         {
 667             block_ChainRelease( p_bridge->pp_es[i]->p_block );
 668         }
 669
 670         p_bridge->pp_es[i]->p_block = NULL;
 671         p_bridge->pp_es[i]->pp_last = &p_bridge->pp_es[i]->p_block;
 672     }
 673
 674     if( b_no_es )
 675     {
 676         for ( i = 0; i < p_bridge->i_es_num; i++ )
 677             free( p_bridge->pp_es[i] );
 678         free( p_bridge->pp_es );
 679         free( p_bridge );
 680         var_Destroy( p_stream->p_libvlc, p_sys->psz_name );
 681     }
 682     }
 683
 684     if( p_sys->b_placeholder )
 685     {
 686         switch( id->i_cat )
 687         {
 688             case VIDEO_ES:
 689                 if( ( p_sys->i_last_video + p_sys->i_placeholder_delay < i_date
 690                     && (  !p_sys->b_switch_on_iframe
 691                        || p_buffer->i_flags & BLOCK_FLAG_TYPE_I ) )
 692                   || p_sys->i_state == placeholder_on )
 693                 {
 694                     p_stream->p_next->pf_send( p_stream->p_next, id->id, p_buffer );
 695                     p_sys->i_state = placeholder_on;
 696                 }
 697                 else
 698                     block_Release( p_buffer );
 699                 break;
 700
 701             case AUDIO_ES:
 702                 if( p_sys->i_last_audio + p_sys->i_placeholder_delay < i_date )
 703                     p_stream->p_next->pf_send( p_stream->p_next, id->id, p_buffer );
 704                 else
 705                     block_Release( p_buffer );
 706                 break;
 707
 708             default:
 709                 block_Release( p_buffer ); /* FIXME: placeholder subs anyone? */
 710                 break;
 711         }
 712     }
 713
 714     vlc_mutex_unlock( p_sys->p_lock );
 715
 716     return VLC_SUCCESS;
 717 }