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 <stdlib.h>
  28 #include <string.h>
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc_sout.h>
  32 #include <vlc_block.h>
  33
  34 /*****************************************************************************
  35  * Module descriptor
  36  *****************************************************************************/
  37 #define ID_TEXT N_("ID")
  38 #define ID_LONGTEXT N_( \
  39     "Integer identifier for this elementary stream. This will be used to " \
  40     "\"find\" this stream later." )
  41
  42 #define DELAY_TEXT N_("Delay")
  43 #define DELAY_LONGTEXT N_("Pictures coming from the picture video outputs " \
  44         "will be delayed according to this value (in milliseconds, should be "\
  45         ">= 100 ms). For high values, you will need to raise caching values." )
  46
  47 #define ID_OFFSET_TEXT N_("ID Offset")
  48 #define ID_OFFSET_LONGTEXT N_("Offset to add to the stream IDs specified in " \
  49         "bridge_out to obtain the stream IDs bridge_in will register.")
  50
  51 static int  OpenOut ( vlc_object_t * );
  52 static void CloseOut( vlc_object_t * );
  53 static int  OpenIn  ( vlc_object_t * );
  54 static void CloseIn ( vlc_object_t * );
  55
  56 #define SOUT_CFG_PREFIX_OUT "sout-bridge-out-"
  57 #define SOUT_CFG_PREFIX_IN "sout-bridge-in-"
  58
  59 vlc_module_begin();
  60     set_shortname( _("Bridge"));
  61     set_description( _("Bridge stream output"));
  62     add_submodule();
  63     set_section( N_("Bridge out"), NULL );
  64     set_capability( "sout stream", 50 );
  65     add_shortcut( "bridge-out" );
  66     /* Only usable with VLM. No category so not in gui preferences
  67     set_category( CAT_SOUT );
  68     set_subcategory( SUBCAT_SOUT_STREAM );*/
  69     add_integer( SOUT_CFG_PREFIX_OUT "id", 0, NULL, ID_TEXT, ID_LONGTEXT,
  70                  VLC_FALSE );
  71     set_callbacks( OpenOut, CloseOut );
  72
  73     add_submodule();
  74     set_section( N_("Bridge in"), NULL );
  75     set_capability( "sout stream", 50 );
  76     add_shortcut( "bridge-in" );
  77     /*set_category( CAT_SOUT );
  78     set_subcategory( SUBCAT_SOUT_STREAM );*/
  79     add_integer( SOUT_CFG_PREFIX_IN "delay", 0, NULL, DELAY_TEXT,
  80                  DELAY_LONGTEXT, VLC_FALSE );
  81     add_integer( SOUT_CFG_PREFIX_IN "id-offset", 8192, NULL, ID_OFFSET_TEXT,
  82                  ID_OFFSET_LONGTEXT, VLC_FALSE );
  83     set_callbacks( OpenIn, CloseIn );
  84
  85 vlc_module_end();
  86
  87
  88 /*****************************************************************************
  89  * Local prototypes
  90  *****************************************************************************/
  91 static const char *ppsz_sout_options_out[] = {
  92     "id", NULL
  93 };
  94
  95 static const char *ppsz_sout_options_in[] = {
  96     "delay", "id-offset", NULL
  97 };
  98
  99 static sout_stream_id_t *AddOut ( sout_stream_t *, es_format_t * );
 100 static int               DelOut ( sout_stream_t *, sout_stream_id_t * );
 101 static int               SendOut( sout_stream_t *, sout_stream_id_t *, block_t * );
 102
 103 static sout_stream_id_t *AddIn ( sout_stream_t *, es_format_t * );
 104 static int               DelIn ( sout_stream_t *, sout_stream_id_t * );
 105 static int               SendIn( sout_stream_t *, sout_stream_id_t *, block_t * );
 106
 107 typedef struct bridged_es_t
 108 {
 109     es_format_t fmt;
 110     block_t *p_block;
 111     block_t **pp_last;
 112     vlc_bool_t b_empty;
 113
 114     /* bridge in part */
 115     sout_stream_id_t *id;
 116     mtime_t i_last;
 117     vlc_bool_t b_changed;
 118 } bridged_es_t;
 119
 120 typedef struct bridge_t
 121 {
 122     bridged_es_t **pp_es;
 123     int i_es_num;
 124 } bridge_t;
 125
 126 #define GetBridge(a) __GetBridge( VLC_OBJECT(a) )
 127 static bridge_t *__GetBridge( vlc_object_t *p_object )
 128 {
 129     bridge_t *p_bridge;
 130     vlc_value_t val;
 131
 132     if( var_Get( p_object->p_libvlc_global, "bridge-struct", &val ) )
 133     {
 134         p_bridge = NULL;
 135     }
 136     else
 137     {
 138         p_bridge = val.p_address;
 139     }
 140
 141     return p_bridge;
 142 }
 143
 144
 145 /*
 146  * Bridge out
 147  */
 148
 149 typedef struct out_sout_stream_sys_t
 150 {
 151     vlc_mutex_t *p_lock;
 152     bridged_es_t *p_es;
 153     int i_id;
 154     vlc_bool_t b_inited;
 155 } out_sout_stream_sys_t;
 156
 157 /*****************************************************************************
 158  * OpenOut:
 159  *****************************************************************************/
 160 static int OpenOut( vlc_object_t *p_this )
 161 {
 162     sout_stream_t     *p_stream = (sout_stream_t *)p_this;
 163     out_sout_stream_sys_t *p_sys;
 164     vlc_value_t val;
 165
 166     config_ChainParse( p_stream, SOUT_CFG_PREFIX_OUT, ppsz_sout_options_out,
 167                    p_stream->p_cfg );
 168
 169     p_sys          = malloc( sizeof( out_sout_stream_sys_t ) );
 170     p_sys->b_inited = VLC_FALSE;
 171
 172     var_Create( p_this->p_libvlc_global, "bridge-lock", VLC_VAR_MUTEX );
 173     var_Get( p_this->p_libvlc_global, "bridge-lock", &val );
 174     p_sys->p_lock = val.p_address;
 175
 176     var_Get( p_stream, SOUT_CFG_PREFIX_OUT "id", &val );
 177     p_sys->i_id = val.i_int;
 178
 179     p_stream->pf_add    = AddOut;
 180     p_stream->pf_del    = DelOut;
 181     p_stream->pf_send   = SendOut;
 182
 183     p_stream->p_sys     = (sout_stream_sys_t *)p_sys;
 184
 185     p_stream->p_sout->i_out_pace_nocontrol++;
 186
 187     return VLC_SUCCESS;
 188 }
 189
 190 /*****************************************************************************
 191  * CloseOut:
 192  *****************************************************************************/
 193 static void CloseOut( vlc_object_t * p_this )
 194 {
 195     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 196     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 197
 198     p_stream->p_sout->i_out_pace_nocontrol--;
 199
 200     free( p_sys );
 201 }
 202
 203 static sout_stream_id_t * AddOut( sout_stream_t *p_stream, es_format_t *p_fmt )
 204 {
 205     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 206     bridge_t *p_bridge;
 207     bridged_es_t *p_es;
 208     int i;
 209
 210     if ( p_sys->b_inited )
 211     {
 212         return NULL;
 213     }
 214     p_sys->b_inited = VLC_TRUE;
 215
 216     vlc_mutex_lock( p_sys->p_lock );
 217
 218     p_bridge = GetBridge( p_stream );
 219     if ( p_bridge == NULL )
 220     {
 221         vlc_object_t *p_libvlc_global = p_stream->p_libvlc_global;
 222         vlc_value_t val;
 223
 224         p_bridge = malloc( sizeof( bridge_t ) );
 225
 226         var_Create( p_libvlc_global, "bridge-struct", VLC_VAR_ADDRESS );
 227         val.p_address = p_bridge;
 228         var_Set( p_libvlc_global, "bridge-struct", val );
 229
 230         p_bridge->i_es_num = 0;
 231         p_bridge->pp_es = NULL;
 232     }
 233
 234     for ( i = 0; i < p_bridge->i_es_num; i++ )
 235     {
 236         if ( p_bridge->pp_es[i]->b_empty && !p_bridge->pp_es[i]->b_changed )
 237             break;
 238     }
 239
 240     if ( i == p_bridge->i_es_num )
 241     {
 242         p_bridge->pp_es = realloc( p_bridge->pp_es,
 243                                    (p_bridge->i_es_num + 1)
 244                                      * sizeof(bridged_es_t *) );
 245         p_bridge->i_es_num++;
 246         p_bridge->pp_es[i] = malloc( sizeof(bridged_es_t) );
 247     }
 248
 249     p_sys->p_es = p_es = p_bridge->pp_es[i];
 250
 251     p_es->fmt = *p_fmt;
 252     p_es->fmt.i_id = p_sys->i_id;
 253     p_es->p_block = NULL;
 254     p_es->pp_last = &p_es->p_block;
 255     p_es->b_empty = VLC_FALSE;
 256
 257     p_es->id = NULL;
 258     p_es->i_last = 0;
 259     p_es->b_changed = VLC_TRUE;
 260
 261     msg_Dbg( p_stream, "bridging out input codec=%4.4s id=%d pos=%d",
 262              (char*)&p_es->fmt.i_codec, p_es->fmt.i_id, i );
 263
 264     vlc_mutex_unlock( p_sys->p_lock );
 265
 266     return (sout_stream_id_t *)p_sys;
 267 }
 268
 269 static int DelOut( sout_stream_t *p_stream, sout_stream_id_t *id )
 270 {
 271     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 272     bridged_es_t *p_es;
 273
 274     if ( !p_sys->b_inited )
 275     {
 276         return VLC_SUCCESS;
 277     }
 278
 279     vlc_mutex_lock( p_sys->p_lock );
 280
 281     p_es = p_sys->p_es;
 282
 283     p_es->b_empty = VLC_TRUE;
 284     block_ChainRelease( p_es->p_block );
 285     p_es->p_block = VLC_FALSE;
 286
 287     p_es->b_changed = VLC_TRUE;
 288     vlc_mutex_unlock( p_sys->p_lock );
 289
 290     p_sys->b_inited = VLC_FALSE;
 291
 292     return VLC_SUCCESS;
 293 }
 294
 295 static int SendOut( sout_stream_t *p_stream, sout_stream_id_t *id,
 296                     block_t *p_buffer )
 297 {
 298     out_sout_stream_sys_t *p_sys = (out_sout_stream_sys_t *)p_stream->p_sys;
 299     bridged_es_t *p_es;
 300
 301     if ( (out_sout_stream_sys_t *)id != p_sys )
 302     {
 303         block_ChainRelease( p_buffer );
 304         return VLC_SUCCESS;
 305     }
 306
 307     vlc_mutex_lock( p_sys->p_lock );
 308
 309     p_es = p_sys->p_es;
 310     *p_es->pp_last = p_buffer;
 311     while ( p_buffer != NULL )
 312     {
 313         p_es->pp_last = &p_buffer->p_next;
 314         p_buffer = p_buffer->p_next;
 315     }
 316
 317     vlc_mutex_unlock( p_sys->p_lock );
 318
 319     return VLC_SUCCESS;
 320 }
 321
 322
 323 /*
 324  * Bridge in
 325  */
 326
 327 typedef struct in_sout_stream_sys_t
 328 {
 329     sout_stream_t *p_out;
 330     vlc_mutex_t *p_lock;
 331     int i_id_offset;
 332     mtime_t i_delay;
 333 } in_sout_stream_sys_t;
 334
 335 /*****************************************************************************
 336  * OpenIn:
 337  *****************************************************************************/
 338 static int OpenIn( vlc_object_t *p_this )
 339 {
 340     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 341     in_sout_stream_sys_t *p_sys;
 342     vlc_value_t val;
 343
 344     p_sys          = malloc( sizeof( in_sout_stream_sys_t ) );
 345
 346     p_sys->p_out = sout_StreamNew( p_stream->p_sout, p_stream->psz_next );
 347     if( !p_sys->p_out )
 348     {
 349         msg_Err( p_stream, "cannot create chain" );
 350         free( p_sys );
 351         return VLC_EGENERIC;
 352     }
 353
 354     config_ChainParse( p_stream, SOUT_CFG_PREFIX_IN, ppsz_sout_options_in,
 355                    p_stream->p_cfg );
 356
 357     var_Create( p_this->p_libvlc_global, "bridge-lock", VLC_VAR_MUTEX );
 358     var_Get( p_this->p_libvlc_global, "bridge-lock", &val );
 359     p_sys->p_lock = val.p_address;
 360
 361     var_Get( p_stream, SOUT_CFG_PREFIX_IN "id-offset", &val );
 362     p_sys->i_id_offset = val.i_int;
 363
 364     var_Get( p_stream, SOUT_CFG_PREFIX_IN "delay", &val );
 365     p_sys->i_delay = (mtime_t)val.i_int * 1000;
 366
 367     p_stream->pf_add    = AddIn;
 368     p_stream->pf_del    = DelIn;
 369     p_stream->pf_send   = SendIn;
 370
 371     p_stream->p_sys     = (sout_stream_sys_t *)p_sys;
 372
 373     /* update p_sout->i_out_pace_nocontrol */
 374     p_stream->p_sout->i_out_pace_nocontrol++;
 375
 376     return VLC_SUCCESS;
 377 }
 378
 379 /*****************************************************************************
 380  * CloseIn:
 381  *****************************************************************************/
 382 static void CloseIn( vlc_object_t * p_this )
 383 {
 384     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 385     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 386
 387     sout_StreamDelete( p_sys->p_out );
 388     p_stream->p_sout->i_out_pace_nocontrol--;
 389
 390     free( p_sys );
 391 }
 392
 393 static sout_stream_id_t * AddIn( sout_stream_t *p_stream, es_format_t *p_fmt )
 394 {
 395     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 396
 397     return p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
 398 }
 399
 400 static int DelIn( sout_stream_t *p_stream, sout_stream_id_t *id )
 401 {
 402     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 403
 404     return p_sys->p_out->pf_del( p_sys->p_out, id );
 405 }
 406
 407 static int SendIn( sout_stream_t *p_stream, sout_stream_id_t *id,
 408                    block_t *p_buffer )
 409 {
 410     in_sout_stream_sys_t *p_sys = (in_sout_stream_sys_t *)p_stream->p_sys;
 411     bridge_t *p_bridge;
 412     vlc_bool_t b_no_es = VLC_TRUE;
 413     int i;
 414
 415     /* First forward the packet for our own ES */
 416     p_sys->p_out->pf_send( p_sys->p_out, id, p_buffer );
 417
 418     /* Then check all bridged streams */
 419     vlc_mutex_lock( p_sys->p_lock );
 420
 421     p_bridge = GetBridge( p_stream );
 422     if ( p_bridge == NULL )
 423     {
 424         vlc_mutex_unlock( p_sys->p_lock );
 425         return VLC_SUCCESS;
 426     }
 427
 428     for ( i = 0; i < p_bridge->i_es_num; i++ )
 429     {
 430         if ( !p_bridge->pp_es[i]->b_empty )
 431             b_no_es = VLC_FALSE;
 432
 433         while ( p_bridge->pp_es[i]->p_block != NULL
 434                  && (p_bridge->pp_es[i]->p_block->i_dts + p_sys->i_delay
 435                        < mdate()
 436                       || p_bridge->pp_es[i]->p_block->i_dts + p_sys->i_delay
 437                           < p_bridge->pp_es[i]->i_last) )
 438         {
 439             block_t *p_block = p_bridge->pp_es[i]->p_block;
 440             msg_Dbg( p_stream, "dropping a packet (" I64Fd ")",
 441                      mdate() - p_block->i_dts - p_sys->i_delay );
 442             p_bridge->pp_es[i]->p_block
 443                 = p_bridge->pp_es[i]->p_block->p_next;
 444             block_Release( p_block );
 445         }
 446
 447         if ( p_bridge->pp_es[i]->p_block == NULL )
 448         {
 449             p_bridge->pp_es[i]->pp_last = &p_bridge->pp_es[i]->p_block;
 450         }
 451
 452         if ( p_bridge->pp_es[i]->b_changed )
 453         {
 454             if ( p_bridge->pp_es[i]->b_empty && p_bridge->pp_es[i]->id != NULL )
 455             {
 456                 p_sys->p_out->pf_del( p_sys->p_out, p_bridge->pp_es[i]->id );
 457             }
 458             else
 459             {
 460                 /* We need at least two packets to enter the mux. */
 461                 if ( p_bridge->pp_es[i]->p_block == NULL
 462                       || p_bridge->pp_es[i]->p_block->p_next == NULL )
 463                 {
 464                     continue;
 465                 }
 466
 467                 p_bridge->pp_es[i]->fmt.i_id += p_sys->i_id_offset;
 468                 p_bridge->pp_es[i]->id = p_sys->p_out->pf_add(
 469                             p_sys->p_out, &p_bridge->pp_es[i]->fmt );
 470                 if ( p_bridge->pp_es[i]->id == NULL )
 471                 {
 472                     msg_Warn( p_stream, "couldn't create chain for id %d",
 473                               p_bridge->pp_es[i]->fmt.i_id );
 474                 }
 475                 msg_Dbg( p_stream, "bridging in input codec=%4.4s id=%d pos=%d",
 476                          (char*)&p_bridge->pp_es[i]->fmt.i_codec,
 477                          p_bridge->pp_es[i]->fmt.i_id, i );
 478             }
 479         }
 480         p_bridge->pp_es[i]->b_changed = VLC_FALSE;
 481
 482         if ( p_bridge->pp_es[i]->b_empty )
 483             continue;
 484
 485         if ( p_bridge->pp_es[i]->p_block == NULL )
 486         {
 487             if ( p_bridge->pp_es[i]->id != NULL
 488                   && p_bridge->pp_es[i]->i_last < mdate() )
 489             {
 490                 p_sys->p_out->pf_del( p_sys->p_out, p_bridge->pp_es[i]->id );
 491                 p_bridge->pp_es[i]->fmt.i_id -= p_sys->i_id_offset;
 492                 p_bridge->pp_es[i]->b_changed = VLC_TRUE;
 493                 p_bridge->pp_es[i]->id = NULL;
 494             }
 495             continue;
 496         }
 497
 498         if ( p_bridge->pp_es[i]->id != NULL )
 499         {
 500             block_t *p_block = p_bridge->pp_es[i]->p_block;
 501             while ( p_block != NULL )
 502             {
 503                 p_bridge->pp_es[i]->i_last = p_block->i_dts;
 504                 p_block->i_pts += p_sys->i_delay;
 505                 p_block->i_dts += p_sys->i_delay;
 506                 p_block = p_block->p_next;
 507             }
 508             p_sys->p_out->pf_send( p_sys->p_out, p_bridge->pp_es[i]->id,
 509                                    p_bridge->pp_es[i]->p_block );
 510         }
 511         else
 512         {
 513             block_ChainRelease( p_bridge->pp_es[i]->p_block );
 514         }
 515
 516         p_bridge->pp_es[i]->p_block = NULL;
 517         p_bridge->pp_es[i]->pp_last = &p_bridge->pp_es[i]->p_block;
 518     }
 519
 520     if( b_no_es )
 521     {
 522         vlc_object_t *p_libvlc_global = p_stream->p_libvlc_global;
 523         for ( i = 0; i < p_bridge->i_es_num; i++ )
 524             free( p_bridge->pp_es[i] );
 525         free( p_bridge->pp_es );
 526         free( p_bridge );
 527         var_Destroy( p_libvlc_global, "bridge-struct" );
 528     }
 529
 530     vlc_mutex_unlock( p_sys->p_lock );
 531
 532     return VLC_SUCCESS;
 533 }