modules/stream_out/bridge.c

   1 /*****************************************************************************
   2  * bridge.c: bridge stream output module
   3  *****************************************************************************
   4  * Copyright (C) 2005-2008 VLC authors and VideoLAN
   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 it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * 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 placeholder" )
  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,
 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,
 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_sys_t *AddOut ( sout_stream_t *, es_format_t * );
 144 static int               DelOut ( sout_stream_t *, sout_stream_id_sys_t * );
 145 static int               SendOut( sout_stream_t *, sout_stream_id_sys_t *, block_t * );
 146
 147 static sout_stream_id_sys_t *AddIn ( sout_stream_t *, es_format_t * );
 148 static int               DelIn ( sout_stream_t *, sout_stream_id_sys_t * );
 149 static int               SendIn( sout_stream_t *, sout_stream_id_sys_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_sys_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 static vlc_mutex_t lock = VLC_STATIC_MUTEX;
 171
 172 /*
 173  * Bridge out
 174  */
 175
 176 typedef struct out_sout_stream_sys_t
 177 {
 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_Get( p_stream, SOUT_CFG_PREFIX_OUT "id", &val );
 203     p_sys->i_id = val.i_int;
 204
 205     var_Get( p_stream, SOUT_CFG_PREFIX_OUT "in-name", &val );
 206     if( asprintf( &p_sys->psz_name, "bridge-struct-%s", val.psz_string )<0 )
 207     {
 208         free( val.psz_string );
 209         free( p_sys );
 210         return VLC_ENOMEM;
 211     }
 212     free( val.psz_string );
 213
 214     p_stream->pf_add    = AddOut;
 215     p_stream->pf_del    = DelOut;
 216     p_stream->pf_send   = SendOut;
 217
 218     p_stream->p_sys     = (sout_stream_sys_t *)p_sys;
 219     p_stream->pace_nocontrol = true;
 220
 221     return VLC_SUCCESS;
 222 }
 223
 224 /*****************************************************************************
 225  * CloseOut:
 226  *****************************************************************************/
 227 static void CloseOut( vlc_object_t * p_this )
 228 {
 229     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 230     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 231
 232     free( p_sys->psz_name );
 233     free( p_sys );
 234 }
 235
 236 static sout_stream_id_sys_t * AddOut( sout_stream_t *p_stream, es_format_t *p_fmt )
 237 {
 238     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 239     bridge_t *p_bridge;
 240     bridged_es_t *p_es;
 241     int i;
 242
 243     if ( p_sys->b_inited )
 244     {
 245         msg_Err( p_stream, "bridge-out can only handle 1 es at a time." );
 246         return NULL;
 247     }
 248     p_sys->b_inited = true;
 249
 250     vlc_mutex_lock( &lock );
 251
 252     p_bridge = var_GetAddress( p_stream->p_libvlc, p_sys->psz_name );
 253     if ( p_bridge == NULL )
 254     {
 255         p_bridge = xmalloc( sizeof( bridge_t ) );
 256
 257         var_Create( p_stream->p_libvlc, p_sys->psz_name, VLC_VAR_ADDRESS );
 258         var_SetAddress( p_stream->p_libvlc, p_sys->psz_name, p_bridge );
 259
 260         p_bridge->i_es_num = 0;
 261         p_bridge->pp_es = NULL;
 262     }
 263
 264     for ( i = 0; i < p_bridge->i_es_num; i++ )
 265     {
 266         if ( p_bridge->pp_es[i]->b_empty && !p_bridge->pp_es[i]->b_changed )
 267             break;
 268     }
 269
 270     if ( i == p_bridge->i_es_num )
 271     {
 272         p_bridge->pp_es = xrealloc( p_bridge->pp_es,
 273                           (p_bridge->i_es_num + 1) * sizeof(bridged_es_t *) );
 274         p_bridge->i_es_num++;
 275         p_bridge->pp_es[i] = xmalloc( sizeof(bridged_es_t) );
 276     }
 277
 278     p_sys->p_es = p_es = p_bridge->pp_es[i];
 279
 280     p_es->fmt = *p_fmt;
 281     p_es->fmt.i_id = p_sys->i_id;
 282     p_es->p_block = NULL;
 283     p_es->pp_last = &p_es->p_block;
 284     p_es->b_empty = false;
 285
 286     p_es->id = NULL;
 287     p_es->i_last = VLC_TS_INVALID;
 288     p_es->b_changed = true;
 289
 290     msg_Dbg( p_stream, "bridging out input codec=%4.4s id=%d pos=%d",
 291              (char*)&p_es->fmt.i_codec, p_es->fmt.i_id, i );
 292
 293     vlc_mutex_unlock( &lock );
 294
 295     return (sout_stream_id_sys_t *)p_sys;
 296 }
 297
 298 static int DelOut( sout_stream_t *p_stream, sout_stream_id_sys_t *id )
 299 {
 300     VLC_UNUSED(id);
 301     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 302     bridged_es_t *p_es;
 303
 304     if ( !p_sys->b_inited )
 305     {
 306         return VLC_SUCCESS;
 307     }
 308
 309     vlc_mutex_lock( &lock );
 310
 311     p_es = p_sys->p_es;
 312
 313     p_es->b_empty = true;
 314     block_ChainRelease( p_es->p_block );
 315     p_es->p_block = false;
 316
 317     p_es->b_changed = true;
 318     vlc_mutex_unlock( &lock );
 319
 320     p_sys->b_inited = false;
 321
 322     return VLC_SUCCESS;
 323 }
 324
 325 static int SendOut( sout_stream_t *p_stream, sout_stream_id_sys_t *id,
 326                     block_t *p_buffer )
 327 {
 328     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 329     bridged_es_t *p_es;
 330
 331     if ( (out_sout_stream_sys_t *)id != p_sys )
 332     {
 333         block_ChainRelease( p_buffer );
 334         return VLC_SUCCESS;
 335     }
 336
 337     vlc_mutex_lock( &lock );
 338
 339     p_es = p_sys->p_es;
 340     *p_es->pp_last = p_buffer;
 341     while ( p_buffer != NULL )
 342     {
 343         p_es->pp_last = &p_buffer->p_next;
 344         p_buffer = p_buffer->p_next;
 345     }
 346
 347     vlc_mutex_unlock( &lock );
 348
 349     return VLC_SUCCESS;
 350 }
 351
 352
 353 /*
 354  * Bridge in
 355  */
 356
 357 typedef struct in_sout_stream_sys_t
 358 {
 359     int i_id_offset;
 360     mtime_t i_delay;
 361
 362     char *psz_name;
 363
 364     bool b_placeholder;
 365     bool b_switch_on_iframe;
 366     int i_state;
 367     mtime_t i_placeholder_delay;
 368     sout_stream_id_sys_t *id_video;
 369     mtime_t i_last_video;
 370     sout_stream_id_sys_t *id_audio;
 371     mtime_t i_last_audio;
 372 } in_sout_stream_sys_t;
 373
 374 enum { placeholder_on, placeholder_off };
 375
 376 /*****************************************************************************
 377  * OpenIn:
 378  *****************************************************************************/
 379 static int OpenIn( vlc_object_t *p_this )
 380 {
 381     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 382     in_sout_stream_sys_t *p_sys;
 383     vlc_value_t val;
 384
 385     p_sys          = malloc( sizeof( in_sout_stream_sys_t ) );
 386     if( unlikely( !p_sys ) )
 387         return VLC_ENOMEM;
 388
 389     if( !p_stream->p_next )
 390     {
 391         msg_Err( p_stream, "cannot create chain" );
 392         free( p_sys );
 393         return VLC_EGENERIC;
 394     }
 395
 396     config_ChainParse( p_stream, SOUT_CFG_PREFIX_IN, ppsz_sout_options_in,
 397                    p_stream->p_cfg );
 398
 399     var_Get( p_stream, SOUT_CFG_PREFIX_IN "id-offset", &val );
 400     p_sys->i_id_offset = val.i_int;
 401
 402     var_Get( p_stream, SOUT_CFG_PREFIX_IN "delay", &val );
 403     p_sys->i_delay = (mtime_t)val.i_int * 1000;
 404
 405     var_Get( p_stream, SOUT_CFG_PREFIX_IN "name", &val );
 406     if( asprintf( &p_sys->psz_name, "bridge-struct-%s", val.psz_string )<0 )
 407     {
 408         free( val.psz_string );
 409         free( p_sys );
 410         return VLC_ENOMEM;
 411     }
 412     free( val.psz_string );
 413
 414     var_Get( p_stream, SOUT_CFG_PREFIX_IN "placeholder", &val );
 415     p_sys->b_placeholder = val.b_bool;
 416
 417     var_Get( p_stream, SOUT_CFG_PREFIX_IN "placeholder-switch-on-iframe", &val);
 418     p_sys->b_switch_on_iframe = val.b_bool;
 419
 420     p_sys->i_state = placeholder_on;
 421
 422     var_Get( p_stream, SOUT_CFG_PREFIX_IN "placeholder-delay", &val );
 423     p_sys->i_placeholder_delay = (mtime_t)val.i_int * 1000;
 424
 425     p_sys->i_last_video = VLC_TS_INVALID;
 426     p_sys->i_last_audio = VLC_TS_INVALID;
 427     p_sys->id_video = NULL;
 428     p_sys->id_audio = NULL;
 429
 430     p_stream->pf_add    = AddIn;
 431     p_stream->pf_del    = DelIn;
 432     p_stream->pf_send   = SendIn;
 433
 434     p_stream->p_sys     = (sout_stream_sys_t *)p_sys;
 435     p_stream->pace_nocontrol = true;
 436
 437     return VLC_SUCCESS;
 438 }
 439
 440 /*****************************************************************************
 441  * CloseIn:
 442  *****************************************************************************/
 443 static void CloseIn( vlc_object_t * p_this )
 444 {
 445     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 446     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 447
 448     free( p_sys->psz_name );
 449     free( p_sys );
 450 }
 451
 452 struct sout_stream_id_sys_t
 453 {
 454     sout_stream_id_sys_t *id;
 455     int i_cat; /* es category. Used for placeholder option */
 456 };
 457
 458 static sout_stream_id_sys_t * AddIn( sout_stream_t *p_stream, es_format_t *p_fmt )
 459 {
 460     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 461
 462     sout_stream_id_sys_t *id = malloc( sizeof( sout_stream_id_sys_t ) );
 463     if( !id ) return NULL;
 464
 465     id->id = p_stream->p_next->pf_add( p_stream->p_next, p_fmt );
 466     if( !id->id )
 467     {
 468         free( id );
 469         return NULL;
 470     }
 471
 472     if( p_sys->b_placeholder )
 473     {
 474         id->i_cat = p_fmt->i_cat;
 475         switch( p_fmt->i_cat )
 476         {
 477             case VIDEO_ES:
 478                 if( p_sys->id_video != NULL )
 479                     msg_Err( p_stream, "We already had a video es!" );
 480                 p_sys->id_video = id->id;
 481                 break;
 482             case AUDIO_ES:
 483                 if( p_sys->id_audio != NULL )
 484                     msg_Err( p_stream, "We already had an audio es!" );
 485                 p_sys->id_audio = id->id;
 486                 break;
 487         }
 488     }
 489
 490     return id;
 491 }
 492
 493 static int DelIn( sout_stream_t *p_stream, sout_stream_id_sys_t *id )
 494 {
 495     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 496
 497     if( id == p_sys->id_video ) p_sys->id_video = NULL;
 498     if( id == p_sys->id_audio ) p_sys->id_audio = NULL;
 499
 500     int ret = p_stream->p_next->pf_del( p_stream->p_next, id->id );
 501
 502     free( id );
 503     return ret;
 504 }
 505
 506 static int SendIn( sout_stream_t *p_stream, sout_stream_id_sys_t *id,
 507                    block_t *p_buffer )
 508 {
 509     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 510     bridge_t *p_bridge;
 511     bool b_no_es = true;
 512     int i;
 513     int i_date = mdate();
 514
 515     /* First forward the packet for our own ES */
 516     if( !p_sys->b_placeholder )
 517         p_stream->p_next->pf_send( p_stream->p_next, id->id, p_buffer );
 518
 519     /* Then check all bridged streams */
 520     vlc_mutex_lock( &lock );
 521
 522     p_bridge = var_GetAddress( p_stream->p_libvlc, p_sys->psz_name );
 523
 524     if( p_bridge )
 525     {
 526     for ( i = 0; i < p_bridge->i_es_num; i++ )
 527     {
 528         if ( !p_bridge->pp_es[i]->b_empty )
 529             b_no_es = false;
 530
 531         while ( p_bridge->pp_es[i]->p_block != NULL
 532                  && (p_bridge->pp_es[i]->p_block->i_dts + p_sys->i_delay
 533                        < i_date
 534                       || p_bridge->pp_es[i]->p_block->i_dts + p_sys->i_delay
 535                           < p_bridge->pp_es[i]->i_last) )
 536         {
 537             block_t *p_block = p_bridge->pp_es[i]->p_block;
 538             msg_Dbg( p_stream, "dropping a packet (%"PRId64 ")",
 539                      i_date - p_block->i_dts - p_sys->i_delay );
 540             p_bridge->pp_es[i]->p_block
 541                 = p_bridge->pp_es[i]->p_block->p_next;
 542             block_Release( p_block );
 543         }
 544
 545         if ( p_bridge->pp_es[i]->p_block == NULL )
 546         {
 547             p_bridge->pp_es[i]->pp_last = &p_bridge->pp_es[i]->p_block;
 548         }
 549
 550         if ( p_bridge->pp_es[i]->b_changed )
 551         {
 552             if ( p_bridge->pp_es[i]->b_empty && p_bridge->pp_es[i]->id != NULL )
 553             {
 554                 p_stream->p_next->pf_del( p_stream->p_next, p_bridge->pp_es[i]->id );
 555             }
 556             else
 557             {
 558                 /* We need at least two packets to enter the mux. */
 559                 if ( p_bridge->pp_es[i]->p_block == NULL
 560                       || p_bridge->pp_es[i]->p_block->p_next == NULL )
 561                 {
 562                     continue;
 563                 }
 564
 565                 p_bridge->pp_es[i]->fmt.i_id += p_sys->i_id_offset;
 566                 if( !p_sys->b_placeholder )
 567                 {
 568                     p_bridge->pp_es[i]->id = p_stream->p_next->pf_add(
 569                                 p_stream->p_next, &p_bridge->pp_es[i]->fmt );
 570                     if ( p_bridge->pp_es[i]->id == NULL )
 571                     {
 572                         msg_Warn( p_stream, "couldn't create chain for id %d",
 573                                   p_bridge->pp_es[i]->fmt.i_id );
 574                     }
 575                 }
 576                 msg_Dbg( p_stream, "bridging in input codec=%4.4s id=%d pos=%d",
 577                          (char*)&p_bridge->pp_es[i]->fmt.i_codec,
 578                          p_bridge->pp_es[i]->fmt.i_id, i );
 579             }
 580         }
 581         p_bridge->pp_es[i]->b_changed = false;
 582
 583         if ( p_bridge->pp_es[i]->b_empty )
 584             continue;
 585
 586         if ( p_bridge->pp_es[i]->p_block == NULL )
 587         {
 588             if ( p_bridge->pp_es[i]->id != NULL
 589                   && p_bridge->pp_es[i]->i_last < i_date )
 590             {
 591                 if( !p_sys->b_placeholder )
 592                     p_stream->p_next->pf_del( p_stream->p_next,
 593                                           p_bridge->pp_es[i]->id );
 594                 p_bridge->pp_es[i]->fmt.i_id -= p_sys->i_id_offset;
 595                 p_bridge->pp_es[i]->b_changed = true;
 596                 p_bridge->pp_es[i]->id = NULL;
 597             }
 598             continue;
 599         }
 600
 601         if ( p_bridge->pp_es[i]->id != NULL || p_sys->b_placeholder)
 602         {
 603             block_t *p_block = p_bridge->pp_es[i]->p_block;
 604             while ( p_block != NULL )
 605             {
 606                 p_bridge->pp_es[i]->i_last = p_block->i_dts;
 607                 p_block->i_pts += p_sys->i_delay;
 608                 p_block->i_dts += p_sys->i_delay;
 609                 p_block = p_block->p_next;
 610             }
 611             sout_stream_id_sys_t *newid = NULL;
 612             if( p_sys->b_placeholder )
 613             {
 614                 switch( p_bridge->pp_es[i]->fmt.i_cat )
 615                 {
 616                     case VIDEO_ES:
 617                         p_sys->i_last_video = i_date;
 618                         newid = p_sys->id_video;
 619                         if( !newid )
 620                             break;
 621                         if( !p_sys->b_switch_on_iframe ||
 622                             p_sys->i_state == placeholder_off ||
 623                             ( p_bridge->pp_es[i]->fmt.i_cat == VIDEO_ES &&
 624                               p_bridge->pp_es[i]->p_block->i_flags & BLOCK_FLAG_TYPE_I ) )
 625                         {
 626                             p_stream->p_next->pf_send( p_stream->p_next,
 627                                        newid,
 628                                        p_bridge->pp_es[i]->p_block );
 629                             p_sys->i_state = placeholder_off;
 630                         }
 631                         break;
 632                     case AUDIO_ES:
 633                         newid = p_sys->id_audio;
 634                         if( !newid )
 635                             break;
 636                         p_sys->i_last_audio = i_date;
 637                     default:
 638                         p_stream->p_next->pf_send( p_stream->p_next,
 639                                    newid?newid:p_bridge->pp_es[i]->id,
 640                                    p_bridge->pp_es[i]->p_block );
 641                         break;
 642                 }
 643             }
 644             else /* !b_placeholder */
 645                 p_stream->p_next->pf_send( p_stream->p_next,
 646                                        p_bridge->pp_es[i]->id,
 647                                        p_bridge->pp_es[i]->p_block );
 648         }
 649         else
 650         {
 651             block_ChainRelease( p_bridge->pp_es[i]->p_block );
 652         }
 653
 654         p_bridge->pp_es[i]->p_block = NULL;
 655         p_bridge->pp_es[i]->pp_last = &p_bridge->pp_es[i]->p_block;
 656     }
 657
 658     if( b_no_es )
 659     {
 660         for ( i = 0; i < p_bridge->i_es_num; i++ )
 661             free( p_bridge->pp_es[i] );
 662         free( p_bridge->pp_es );
 663         free( p_bridge );
 664         var_Destroy( p_stream->p_libvlc, p_sys->psz_name );
 665     }
 666     }
 667
 668     if( p_sys->b_placeholder )
 669     {
 670         switch( id->i_cat )
 671         {
 672             case VIDEO_ES:
 673                 if( ( p_sys->i_last_video + p_sys->i_placeholder_delay < i_date
 674                     && (  !p_sys->b_switch_on_iframe
 675                        || p_buffer->i_flags & BLOCK_FLAG_TYPE_I ) )
 676                   || p_sys->i_state == placeholder_on )
 677                 {
 678                     p_stream->p_next->pf_send( p_stream->p_next, id->id, p_buffer );
 679                     p_sys->i_state = placeholder_on;
 680                 }
 681                 else
 682                     block_Release( p_buffer );
 683                 break;
 684
 685             case AUDIO_ES:
 686                 if( p_sys->i_last_audio + p_sys->i_placeholder_delay < i_date )
 687                     p_stream->p_next->pf_send( p_stream->p_next, id->id, p_buffer );
 688                 else
 689                     block_Release( p_buffer );
 690                 break;
 691
 692             default:
 693                 block_Release( p_buffer ); /* FIXME: placeholder subs anyone? */
 694                 break;
 695         }
 696     }
 697
 698     vlc_mutex_unlock( &lock );
 699
 700     return VLC_SUCCESS;
 701 }