git.sesse.net Git - vlc/blob - modules/stream_out/bridge.c

   1 /*****************************************************************************
   2  * bridge.c: bridge stream output module
   3  *****************************************************************************
   4  * Copyright (C) 2005 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   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 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <string.h>
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc_sout.h>
  31 #include <vlc_block.h>
  32
  33 /*****************************************************************************
  34  * Module descriptor
  35  *****************************************************************************/
  36 #define ID_TEXT N_("ID")
  37 #define ID_LONGTEXT N_( \
  38     "Integer identifier for this elementary stream. This will be used to " \
  39     "\"find\" this stream later." )
  40
  41 #define DELAY_TEXT N_("Delay")
  42 #define DELAY_LONGTEXT N_("Pictures coming from the picture video outputs " \
  43         "will be delayed according to this value (in milliseconds, should be "\
  44         ">= 100 ms). For high values, you will need to raise caching values." )
  45
  46 #define ID_OFFSET_TEXT N_("ID Offset")
  47 #define ID_OFFSET_LONGTEXT N_("Offset to add to the stream IDs specified in " \
  48         "bridge_out to obtain the stream IDs bridge_in will register.")
  49
  50 static int  OpenOut ( vlc_object_t * );
  51 static void CloseOut( vlc_object_t * );
  52 static int  OpenIn  ( vlc_object_t * );
  53 static void CloseIn ( vlc_object_t * );
  54
  55 #define SOUT_CFG_PREFIX_OUT "sout-bridge-out-"
  56 #define SOUT_CFG_PREFIX_IN "sout-bridge-in-"
  57
  58 vlc_module_begin();
  59     set_shortname( _("Bridge"));
  60     set_description( _("Bridge stream output"));
  61     add_submodule();
  62     set_section( N_("Bridge out"), NULL );
  63     set_capability( "sout stream", 50 );
  64     add_shortcut( "bridge-out" );
  65     /* Only usable with VLM. No category so not in gui preferences
  66     set_category( CAT_SOUT );
  67     set_subcategory( SUBCAT_SOUT_STREAM );*/
  68     add_integer( SOUT_CFG_PREFIX_OUT "id", 0, NULL, ID_TEXT, ID_LONGTEXT,
  69                  VLC_FALSE );
  70     set_callbacks( OpenOut, CloseOut );
  71
  72     add_submodule();
  73     set_section( N_("Bridge in"), NULL );
  74     set_capability( "sout stream", 50 );
  75     add_shortcut( "bridge-in" );
  76     /*set_category( CAT_SOUT );
  77     set_subcategory( SUBCAT_SOUT_STREAM );*/
  78     add_integer( SOUT_CFG_PREFIX_IN "delay", 0, NULL, DELAY_TEXT,
  79                  DELAY_LONGTEXT, VLC_FALSE );
  80     add_integer( SOUT_CFG_PREFIX_IN "id-offset", 8192, NULL, ID_OFFSET_TEXT,
  81                  ID_OFFSET_LONGTEXT, VLC_FALSE );
  82     set_callbacks( OpenIn, CloseIn );
  83
  84 vlc_module_end();
  85
  86
  87 /*****************************************************************************
  88  * Local prototypes
  89  *****************************************************************************/
  90 static const char *ppsz_sout_options_out[] = {
  91     "id", NULL
  92 };
  93
  94 static const char *ppsz_sout_options_in[] = {
  95     "delay", "id-offset", NULL
  96 };
  97
  98 static sout_stream_id_t *AddOut ( sout_stream_t *, es_format_t * );
  99 static int               DelOut ( sout_stream_t *, sout_stream_id_t * );
 100 static int               SendOut( sout_stream_t *, sout_stream_id_t *, block_t * );
 101
 102 static sout_stream_id_t *AddIn ( sout_stream_t *, es_format_t * );
 103 static int               DelIn ( sout_stream_t *, sout_stream_id_t * );
 104 static int               SendIn( sout_stream_t *, sout_stream_id_t *, block_t * );
 105
 106 typedef struct bridged_es_t
 107 {
 108     es_format_t fmt;
 109     block_t *p_block;
 110     block_t **pp_last;
 111     vlc_bool_t b_empty;
 112
 113     /* bridge in part */
 114     sout_stream_id_t *id;
 115     mtime_t i_last;
 116     vlc_bool_t b_changed;
 117 } bridged_es_t;
 118
 119 typedef struct bridge_t
 120 {
 121     bridged_es_t **pp_es;
 122     int i_es_num;
 123 } bridge_t;
 124
 125 #define GetBridge(a) __GetBridge( VLC_OBJECT(a) )
 126 static bridge_t *__GetBridge( vlc_object_t *p_object )
 127 {
 128     bridge_t *p_bridge;
 129     vlc_value_t val;
 130
 131     if( var_Get( p_object->p_libvlc, "bridge-struct", &val ) )
 132     {
 133         p_bridge = NULL;
 134     }
 135     else
 136     {
 137         p_bridge = val.p_address;
 138     }
 139
 140     return p_bridge;
 141 }
 142
 143
 144 /*
 145  * Bridge out
 146  */
 147
 148 typedef struct out_sout_stream_sys_t
 149 {
 150     vlc_mutex_t *p_lock;
 151     bridged_es_t *p_es;
 152     int i_id;
 153     vlc_bool_t b_inited;
 154 } out_sout_stream_sys_t;
 155
 156 /*****************************************************************************
 157  * OpenOut:
 158  *****************************************************************************/
 159 static int OpenOut( vlc_object_t *p_this )
 160 {
 161     sout_stream_t     *p_stream = (sout_stream_t *)p_this;
 162     out_sout_stream_sys_t *p_sys;
 163     vlc_value_t val;
 164
 165     config_ChainParse( p_stream, SOUT_CFG_PREFIX_OUT, ppsz_sout_options_out,
 166                    p_stream->p_cfg );
 167
 168     p_sys          = malloc( sizeof( out_sout_stream_sys_t ) );
 169     p_sys->b_inited = VLC_FALSE;
 170
 171     var_Create( p_this->p_libvlc, "bridge-lock", VLC_VAR_MUTEX );
 172     var_Get( p_this->p_libvlc, "bridge-lock", &val );
 173     p_sys->p_lock = val.p_address;
 174
 175     var_Get( p_stream, SOUT_CFG_PREFIX_OUT "id", &val );
 176     p_sys->i_id = val.i_int;
 177
 178     p_stream->pf_add    = AddOut;
 179     p_stream->pf_del    = DelOut;
 180     p_stream->pf_send   = SendOut;
 181
 182     p_stream->p_sys     = (sout_stream_sys_t *)p_sys;
 183
 184     p_stream->p_sout->i_out_pace_nocontrol++;
 185
 186     return VLC_SUCCESS;
 187 }
 188
 189 /*****************************************************************************
 190  * CloseOut:
 191  *****************************************************************************/
 192 static void CloseOut( vlc_object_t * p_this )
 193 {
 194     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 195     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 196
 197     p_stream->p_sout->i_out_pace_nocontrol--;
 198
 199     free( p_sys );
 200 }
 201
 202 static sout_stream_id_t * AddOut( sout_stream_t *p_stream, es_format_t *p_fmt )
 203 {
 204     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 205     bridge_t *p_bridge;
 206     bridged_es_t *p_es;
 207     int i;
 208
 209     if ( p_sys->b_inited )
 210     {
 211         return NULL;
 212     }
 213     p_sys->b_inited = VLC_TRUE;
 214
 215     vlc_mutex_lock( p_sys->p_lock );
 216
 217     p_bridge = GetBridge( p_stream );
 218     if ( p_bridge == NULL )
 219     {
 220         vlc_object_t *p_libvlc = p_stream->p_libvlc;
 221         vlc_value_t val;
 222
 223         p_bridge = malloc( sizeof( bridge_t ) );
 224
 225         var_Create( p_libvlc, "bridge-struct", VLC_VAR_ADDRESS );
 226         val.p_address = p_bridge;
 227         var_Set( p_libvlc, "bridge-struct", val );
 228
 229         p_bridge->i_es_num = 0;
 230         p_bridge->pp_es = NULL;
 231     }
 232
 233     for ( i = 0; i < p_bridge->i_es_num; i++ )
 234     {
 235         if ( p_bridge->pp_es[i]->b_empty && !p_bridge->pp_es[i]->b_changed )
 236             break;
 237     }
 238
 239     if ( i == p_bridge->i_es_num )
 240     {
 241         p_bridge->pp_es = realloc( p_bridge->pp_es,
 242                                    (p_bridge->i_es_num + 1)
 243                                      * sizeof(bridged_es_t *) );
 244         p_bridge->i_es_num++;
 245         p_bridge->pp_es[i] = malloc( sizeof(bridged_es_t) );
 246     }
 247
 248     p_sys->p_es = p_es = p_bridge->pp_es[i];
 249
 250     p_es->fmt = *p_fmt;
 251     p_es->fmt.i_id = p_sys->i_id;
 252     p_es->p_block = NULL;
 253     p_es->pp_last = &p_es->p_block;
 254     p_es->b_empty = VLC_FALSE;
 255
 256     p_es->id = NULL;
 257     p_es->i_last = 0;
 258     p_es->b_changed = VLC_TRUE;
 259
 260     msg_Dbg( p_stream, "bridging out input codec=%4.4s id=%d pos=%d",
 261              (char*)&p_es->fmt.i_codec, p_es->fmt.i_id, i );
 262
 263     vlc_mutex_unlock( p_sys->p_lock );
 264
 265     return (sout_stream_id_t *)p_sys;
 266 }
 267
 268 static int DelOut( sout_stream_t *p_stream, sout_stream_id_t *id )
 269 {
 270     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 271     bridged_es_t *p_es;
 272
 273     if ( !p_sys->b_inited )
 274     {
 275         return VLC_SUCCESS;
 276     }
 277
 278     vlc_mutex_lock( p_sys->p_lock );
 279
 280     p_es = p_sys->p_es;
 281
 282     p_es->b_empty = VLC_TRUE;
 283     block_ChainRelease( p_es->p_block );
 284     p_es->p_block = VLC_FALSE;
 285
 286     p_es->b_changed = VLC_TRUE;
 287     vlc_mutex_unlock( p_sys->p_lock );
 288
 289     p_sys->b_inited = VLC_FALSE;
 290
 291     return VLC_SUCCESS;
 292 }
 293
 294 static int SendOut( sout_stream_t *p_stream, sout_stream_id_t *id,
 295                     block_t *p_buffer )
 296 {
 297     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 298     bridged_es_t *p_es;
 299
 300     if ( (out_sout_stream_sys_t *)id != p_sys )
 301     {
 302         block_ChainRelease( p_buffer );
 303         return VLC_SUCCESS;
 304     }
 305
 306     vlc_mutex_lock( p_sys->p_lock );
 307
 308     p_es = p_sys->p_es;
 309     *p_es->pp_last = p_buffer;
 310     while ( p_buffer != NULL )
 311     {
 312         p_es->pp_last = &p_buffer->p_next;
 313         p_buffer = p_buffer->p_next;
 314     }
 315
 316     vlc_mutex_unlock( p_sys->p_lock );
 317
 318     return VLC_SUCCESS;
 319 }
 320
 321
 322 /*
 323  * Bridge in
 324  */
 325
 326 typedef struct in_sout_stream_sys_t
 327 {
 328     sout_stream_t *p_out;
 329     vlc_mutex_t *p_lock;
 330     int i_id_offset;
 331     mtime_t i_delay;
 332 } in_sout_stream_sys_t;
 333
 334 /*****************************************************************************
 335  * OpenIn:
 336  *****************************************************************************/
 337 static int OpenIn( vlc_object_t *p_this )
 338 {
 339     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 340     in_sout_stream_sys_t *p_sys;
 341     vlc_value_t val;
 342
 343     p_sys          = malloc( sizeof( in_sout_stream_sys_t ) );
 344
 345     p_sys->p_out = sout_StreamNew( p_stream->p_sout, p_stream->psz_next );
 346     if( !p_sys->p_out )
 347     {
 348         msg_Err( p_stream, "cannot create chain" );
 349         free( p_sys );
 350         return VLC_EGENERIC;
 351     }
 352
 353     config_ChainParse( p_stream, SOUT_CFG_PREFIX_IN, ppsz_sout_options_in,
 354                    p_stream->p_cfg );
 355
 356     var_Create( p_this->p_libvlc, "bridge-lock", VLC_VAR_MUTEX );
 357     var_Get( p_this->p_libvlc, "bridge-lock", &val );
 358     p_sys->p_lock = val.p_address;
 359
 360     var_Get( p_stream, SOUT_CFG_PREFIX_IN "id-offset", &val );
 361     p_sys->i_id_offset = val.i_int;
 362
 363     var_Get( p_stream, SOUT_CFG_PREFIX_IN "delay", &val );
 364     p_sys->i_delay = (mtime_t)val.i_int * 1000;
 365
 366     p_stream->pf_add    = AddIn;
 367     p_stream->pf_del    = DelIn;
 368     p_stream->pf_send   = SendIn;
 369
 370     p_stream->p_sys     = (sout_stream_sys_t *)p_sys;
 371
 372     /* update p_sout->i_out_pace_nocontrol */
 373     p_stream->p_sout->i_out_pace_nocontrol++;
 374
 375     return VLC_SUCCESS;
 376 }
 377
 378 /*****************************************************************************
 379  * CloseIn:
 380  *****************************************************************************/
 381 static void CloseIn( vlc_object_t * p_this )
 382 {
 383     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 384     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 385
 386     sout_StreamDelete( p_sys->p_out );
 387     p_stream->p_sout->i_out_pace_nocontrol--;
 388
 389     free( p_sys );
 390 }
 391
 392 static sout_stream_id_t * AddIn( sout_stream_t *p_stream, es_format_t *p_fmt )
 393 {
 394     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 395
 396     return p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
 397 }
 398
 399 static int DelIn( sout_stream_t *p_stream, sout_stream_id_t *id )
 400 {
 401     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 402
 403     return p_sys->p_out->pf_del( p_sys->p_out, id );
 404 }
 405
 406 static int SendIn( sout_stream_t *p_stream, sout_stream_id_t *id,
 407                    block_t *p_buffer )
 408 {
 409     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 410     bridge_t *p_bridge;
 411     vlc_bool_t b_no_es = VLC_TRUE;
 412     int i;
 413
 414     /* First forward the packet for our own ES */
 415     p_sys->p_out->pf_send( p_sys->p_out, id, p_buffer );
 416
 417     /* Then check all bridged streams */
 418     vlc_mutex_lock( p_sys->p_lock );
 419
 420     p_bridge = GetBridge( p_stream );
 421     if ( p_bridge == NULL )
 422     {
 423         vlc_mutex_unlock( p_sys->p_lock );
 424         return VLC_SUCCESS;
 425     }
 426
 427     for ( i = 0; i < p_bridge->i_es_num; i++ )
 428     {
 429         if ( !p_bridge->pp_es[i]->b_empty )
 430             b_no_es = VLC_FALSE;
 431
 432         while ( p_bridge->pp_es[i]->p_block != NULL
 433                  && (p_bridge->pp_es[i]->p_block->i_dts + p_sys->i_delay
 434                        < mdate()
 435                       || p_bridge->pp_es[i]->p_block->i_dts + p_sys->i_delay
 436                           < p_bridge->pp_es[i]->i_last) )
 437         {
 438             block_t *p_block = p_bridge->pp_es[i]->p_block;
 439             msg_Dbg( p_stream, "dropping a packet (" I64Fd ")",
 440                      mdate() - p_block->i_dts - p_sys->i_delay );
 441             p_bridge->pp_es[i]->p_block
 442                 = p_bridge->pp_es[i]->p_block->p_next;
 443             block_Release( p_block );
 444         }
 445
 446         if ( p_bridge->pp_es[i]->p_block == NULL )
 447         {
 448             p_bridge->pp_es[i]->pp_last = &p_bridge->pp_es[i]->p_block;
 449         }
 450
 451         if ( p_bridge->pp_es[i]->b_changed )
 452         {
 453             if ( p_bridge->pp_es[i]->b_empty && p_bridge->pp_es[i]->id != NULL )
 454             {
 455                 p_sys->p_out->pf_del( p_sys->p_out, p_bridge->pp_es[i]->id );
 456             }
 457             else
 458             {
 459                 /* We need at least two packets to enter the mux. */
 460                 if ( p_bridge->pp_es[i]->p_block == NULL
 461                       || p_bridge->pp_es[i]->p_block->p_next == NULL )
 462                 {
 463                     continue;
 464                 }
 465
 466                 p_bridge->pp_es[i]->fmt.i_id += p_sys->i_id_offset;
 467                 p_bridge->pp_es[i]->id = p_sys->p_out->pf_add(
 468                             p_sys->p_out, &p_bridge->pp_es[i]->fmt );
 469                 if ( p_bridge->pp_es[i]->id == NULL )
 470                 {
 471                     msg_Warn( p_stream, "couldn't create chain for id %d",
 472                               p_bridge->pp_es[i]->fmt.i_id );
 473                 }
 474                 msg_Dbg( p_stream, "bridging in input codec=%4.4s id=%d pos=%d",
 475                          (char*)&p_bridge->pp_es[i]->fmt.i_codec,
 476                          p_bridge->pp_es[i]->fmt.i_id, i );
 477             }
 478         }
 479         p_bridge->pp_es[i]->b_changed = VLC_FALSE;
 480
 481         if ( p_bridge->pp_es[i]->b_empty )
 482             continue;
 483
 484         if ( p_bridge->pp_es[i]->p_block == NULL )
 485         {
 486             if ( p_bridge->pp_es[i]->id != NULL
 487                   && p_bridge->pp_es[i]->i_last < mdate() )
 488             {
 489                 p_sys->p_out->pf_del( p_sys->p_out, p_bridge->pp_es[i]->id );
 490                 p_bridge->pp_es[i]->fmt.i_id -= p_sys->i_id_offset;
 491                 p_bridge->pp_es[i]->b_changed = VLC_TRUE;
 492                 p_bridge->pp_es[i]->id = NULL;
 493             }
 494             continue;
 495         }
 496
 497         if ( p_bridge->pp_es[i]->id != NULL )
 498         {
 499             block_t *p_block = p_bridge->pp_es[i]->p_block;
 500             while ( p_block != NULL )
 501             {
 502                 p_bridge->pp_es[i]->i_last = p_block->i_dts;
 503                 p_block->i_pts += p_sys->i_delay;
 504                 p_block->i_dts += p_sys->i_delay;
 505                 p_block = p_block->p_next;
 506             }
 507             p_sys->p_out->pf_send( p_sys->p_out, p_bridge->pp_es[i]->id,
 508                                    p_bridge->pp_es[i]->p_block );
 509         }
 510         else
 511         {
 512             block_ChainRelease( p_bridge->pp_es[i]->p_block );
 513         }
 514
 515         p_bridge->pp_es[i]->p_block = NULL;
 516         p_bridge->pp_es[i]->pp_last = &p_bridge->pp_es[i]->p_block;
 517     }
 518
 519     if( b_no_es )
 520     {
 521         vlc_object_t *p_libvlc = p_stream->p_libvlc;
 522         for ( i = 0; i < p_bridge->i_es_num; i++ )
 523             free( p_bridge->pp_es[i] );
 524         free( p_bridge->pp_es );
 525         free( p_bridge );
 526         var_Destroy( p_libvlc, "bridge-struct" );
 527     }
 528
 529     vlc_mutex_unlock( p_sys->p_lock );
 530
 531     return VLC_SUCCESS;
 532 }