modules/access/dv.c

   1 /*****************************************************************************
   2  * dv.c: Digital video/Firewire input (file: access plug-in)
   3  *****************************************************************************
   4  * Copyright (C) 2005 M2X
   5  * $Id$
   6  *
   7  * Authors: Jean-Paul Saman <jpsaman at m2x dot nl>
   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 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33 #include <vlc_access.h>
  34
  35 #include <errno.h>
  36 #ifdef HAVE_SYS_TYPES_H
  37 #   include <sys/types.h>
  38 #endif
  39 #ifdef HAVE_SYS_TIME_H
  40 #   include <sys/time.h>
  41 #endif
  42 #ifdef HAVE_SYS_STAT_H
  43 #   include <sys/stat.h>
  44 #endif
  45 #ifdef HAVE_FCNTL_H
  46 #   include <fcntl.h>
  47 #endif
  48
  49 #ifdef HAVE_UNISTD_H
  50 #   include <unistd.h>
  51 #elif defined( WIN32 ) && !defined( UNDER_CE )
  52 #   include <io.h>
  53 #endif
  54
  55 #include <sys/poll.h>
  56
  57 #include <libraw1394/raw1394.h>
  58 #include <libraw1394/csr.h>
  59 #include <libavc1394/avc1394.h>
  60 #include <libavc1394/avc1394_vcr.h>
  61 #include <libavc1394/rom1394.h>
  62
  63 /*****************************************************************************
  64  * Module descriptor
  65  *****************************************************************************/
  66 static int  Open ( vlc_object_t * );
  67 static void Close( vlc_object_t * );
  68 static block_t *Block( access_t * );
  69 static int Control( access_t *, int, va_list );
  70
  71 #define CACHING_TEXT N_("Caching value in ms")
  72 #define CACHING_LONGTEXT N_( \
  73     "Caching value for DV streams. This " \
  74     "value should be set in milliseconds." )
  75
  76 vlc_module_begin();
  77     set_description( N_("Digital Video (Firewire/ieee1394)  input") );
  78     set_shortname( N_("dv") );
  79     set_category( CAT_INPUT );
  80     set_subcategory( SUBCAT_INPUT_ACCESS );
  81     add_integer( "dv-caching", 60000 / 1000, NULL, CACHING_TEXT, CACHING_LONGTEXT, true );
  82     set_capability( "access", 0 );
  83     add_shortcut( "dv" );
  84     add_shortcut( "dv1394" );
  85     add_shortcut( "raw1394" );
  86     set_callbacks( Open, Close );
  87 vlc_module_end();
  88
  89 typedef struct
  90 {
  91     VLC_COMMON_MEMBERS
  92
  93     access_t        *p_access;
  94     vlc_mutex_t     lock;
  95     block_t         *p_frame;
  96     block_t         **pp_last;
  97
  98 } event_thread_t;
  99
 100 static void* Raw1394EventThread( vlc_object_t * );
 101 static int Raw1394Handler( raw1394handle_t, int, size_t, quadlet_t * );
 102
 103 static int Raw1394GetNumPorts( access_t *p_access );
 104 static raw1394handle_t Raw1394Open( access_t *, int );
 105 static void Raw1394Close( raw1394handle_t );
 106
 107 static int DiscoverAVC( access_t *, int *, uint64_t );
 108 static raw1394handle_t AVCOpen( access_t *, int );
 109 static void AVCClose( access_t * );
 110 static int AVCResetHandler( raw1394handle_t, unsigned int );
 111 static int AVCPlay( access_t *, int );
 112 static int AVCPause( access_t *, int );
 113 static int AVCStop( access_t *, int );
 114
 115 struct access_sys_t
 116 {
 117     raw1394handle_t p_avc1394;
 118     raw1394handle_t p_raw1394;
 119     struct pollfd   raw1394_poll;
 120
 121     int i_cards;
 122     int i_node;
 123     int i_port;
 124     int i_channel;
 125     uint64_t i_guid;
 126
 127     /* event */
 128     event_thread_t *p_ev;
 129     vlc_mutex_t lock;
 130     block_t *p_frame;
 131 };
 132
 133 /*****************************************************************************
 134  * Open: open the file
 135  *****************************************************************************/
 136 static int Open( vlc_object_t *p_this )
 137 {
 138     access_t     *p_access = (access_t*)p_this;
 139     access_sys_t *p_sys;
 140     char *psz_name = strdup( p_access->psz_path );
 141
 142     struct raw1394_portinfo port_inf[ 16 ];
 143     iso_handler_t oldhandler;
 144
 145     msg_Dbg( p_access, "opening device %s", psz_name );
 146
 147     /* Set up p_access */
 148     access_InitFields( p_access );
 149     ACCESS_SET_CALLBACKS( NULL, Block, Control, NULL );
 150     p_access->info.b_prebuffered = false;
 151
 152     p_access->p_sys = p_sys = malloc( sizeof( access_sys_t ) );
 153     if( !p_sys )
 154     {
 155         free( psz_name );
 156         return VLC_EGENERIC;
 157     }
 158
 159     p_sys->i_cards = 0;
 160     p_sys->i_node = 0;
 161     p_sys->i_port = 0;
 162     p_sys->i_guid = 0;
 163     p_sys->i_channel = 63;
 164     p_sys->p_raw1394 = NULL;
 165     p_sys->p_avc1394 = NULL;
 166     p_sys->p_frame = NULL;
 167     p_sys->p_ev = NULL;
 168
 169     vlc_mutex_init( &p_sys->lock );
 170
 171     p_sys->i_node = DiscoverAVC( p_access, &p_sys->i_port, p_sys->i_guid );
 172     if( p_sys->i_node < 0 )
 173     {
 174         msg_Err( p_access, "failed to open a Firewire (IEEE1394) connection" );
 175         Close( p_this );
 176         free( psz_name );
 177         return VLC_EGENERIC;
 178     }
 179
 180     p_sys->p_avc1394 = AVCOpen( p_access, p_sys->i_port );
 181     if( !p_sys->p_avc1394 )
 182     {
 183         msg_Err( p_access, "no Digital Video Control device found on %s", psz_name );
 184         Close( p_this );
 185         free( psz_name );
 186         return VLC_EGENERIC;
 187     }
 188
 189     p_sys->p_raw1394 = raw1394_new_handle();
 190     if( !p_sys->p_raw1394 )
 191     {
 192         msg_Err( p_access, "no Digital Video device found on %s", psz_name );
 193         Close( p_this );
 194         free( psz_name );
 195         return VLC_EGENERIC;
 196     }
 197
 198     p_sys->i_cards = raw1394_get_port_info( p_sys->p_raw1394, port_inf, 16 );
 199     if( p_sys->i_cards < 0 )
 200     {
 201         msg_Err( p_access, "failed to get port info for %s", psz_name );
 202         Close( p_this );
 203         free( psz_name );
 204         return VLC_EGENERIC;
 205     }
 206
 207     if( raw1394_set_port( p_sys->p_raw1394, p_sys->i_port ) < 0 )
 208     {
 209         msg_Err( p_access, "failed to set port info for %s", psz_name );
 210         Close( p_this );
 211         free( psz_name );
 212         return VLC_EGENERIC;
 213     }
 214
 215     oldhandler = raw1394_set_iso_handler( p_sys->p_raw1394,
 216                                           p_sys->i_channel, Raw1394Handler );
 217     raw1394_set_userdata( p_sys->p_raw1394, p_access );
 218     raw1394_start_iso_rcv( p_sys->p_raw1394, p_sys->i_channel );
 219
 220     p_sys->raw1394_poll.fd = raw1394_get_fd( p_sys->p_raw1394 );
 221     p_sys->raw1394_poll.events = POLLIN | POLLPRI;
 222
 223     /* Update default_pts to a suitable value for udp access */
 224     var_Create( p_access, "dv-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
 225
 226     /* Now create our event thread catcher */
 227     p_sys->p_ev = vlc_object_create( p_access, sizeof( event_thread_t ) );
 228     if( !p_sys->p_ev )
 229     {
 230         msg_Err( p_access, "failed to create event thread for %s", psz_name );
 231         Close( p_this );
 232         free( psz_name );
 233         return VLC_EGENERIC;
 234     }
 235
 236     p_sys->p_ev->p_frame = NULL;
 237     p_sys->p_ev->pp_last = &p_sys->p_ev->p_frame;
 238     p_sys->p_ev->p_access = p_access;
 239     vlc_mutex_init( &p_sys->p_ev->lock );
 240     vlc_thread_create( p_sys->p_ev, "dv event thread handler", Raw1394EventThread,
 241                        VLC_THREAD_PRIORITY_OUTPUT, false );
 242
 243     free( psz_name );
 244     return VLC_SUCCESS;
 245 }
 246
 247 /*****************************************************************************
 248  * Close: free unused data structures
 249  *****************************************************************************/
 250 static void Close( vlc_object_t *p_this )
 251 {
 252     access_t     *p_access = (access_t*)p_this;
 253     access_sys_t *p_sys = p_access->p_sys;
 254
 255     if( p_sys->p_ev )
 256     {
 257         /* stop the event handler */
 258         vlc_object_kill( p_sys->p_ev );
 259
 260         if( p_sys->p_raw1394 )
 261             raw1394_stop_iso_rcv( p_sys->p_raw1394, p_sys->i_channel );
 262
 263         vlc_mutex_destroy( &p_sys->p_ev->lock );
 264         vlc_thread_join( p_sys->p_ev );
 265
 266         /* Cleanup frame data */
 267         if( p_sys->p_ev->p_frame )
 268         {
 269             vlc_mutex_lock( &p_sys->p_ev->lock );
 270             block_ChainRelease( p_sys->p_ev->p_frame );
 271             p_sys->p_ev->p_frame = NULL;
 272             p_sys->p_ev->pp_last = &p_sys->p_frame;
 273             vlc_mutex_unlock( &p_sys->p_ev->lock );
 274         }
 275         vlc_object_release( p_sys->p_ev );
 276     }
 277
 278     if( p_sys->p_frame )
 279         block_ChainRelease( p_sys->p_frame );
 280     if( p_sys->p_raw1394 )
 281         raw1394_destroy_handle( p_sys->p_raw1394 );
 282
 283     AVCClose( p_access );
 284
 285     vlc_mutex_destroy( &p_sys->lock );
 286     free( p_sys );
 287 }
 288
 289 /*****************************************************************************
 290  * Control:
 291  *****************************************************************************/
 292 static int Control( access_t *p_access, int i_query, va_list args )
 293 {
 294     access_sys_t *p_sys = p_access->p_sys;
 295     bool   *pb_bool;
 296     int64_t      *pi_64;
 297
 298     switch( i_query )
 299     {
 300         /* */
 301         case ACCESS_CAN_PAUSE:
 302             pb_bool = (bool*)va_arg( args, bool* );
 303             *pb_bool = true;
 304             break;
 305
 306        case ACCESS_CAN_SEEK:
 307        case ACCESS_CAN_FASTSEEK:
 308        case ACCESS_CAN_CONTROL_PACE:
 309             pb_bool = (bool*)va_arg( args, bool* );
 310             *pb_bool = false;
 311             break;
 312
 313         case ACCESS_GET_PTS_DELAY:
 314             pi_64 = (int64_t*)va_arg( args, int64_t * );
 315             *pi_64 = var_GetInteger( p_access, "dv-caching" ) * 1000;
 316             break;
 317
 318         /* */
 319         case ACCESS_SET_PAUSE_STATE:
 320             AVCPause( p_access, p_sys->i_node );
 321             break;
 322
 323         case ACCESS_GET_TITLE_INFO:
 324         case ACCESS_SET_TITLE:
 325         case ACCESS_SET_SEEKPOINT:
 326         case ACCESS_SET_PRIVATE_ID_STATE:
 327         case ACCESS_GET_CONTENT_TYPE:
 328             return VLC_EGENERIC;
 329
 330         default:
 331             msg_Warn( p_access, "unimplemented query in control" );
 332             return VLC_EGENERIC;
 333
 334     }
 335     return VLC_SUCCESS;
 336 }
 337
 338 static block_t *Block( access_t *p_access )
 339 {
 340     access_sys_t *p_sys = p_access->p_sys;
 341     block_t *p_block = NULL;
 342
 343 #if 0
 344     if( !p_access->psz_demux )
 345     {
 346         free( p_access->psz_demux );
 347         p_access->psz_demux = strdup( "rawdv" );
 348     }
 349 #endif
 350
 351     vlc_mutex_lock( &p_sys->lock );
 352     p_block = p_sys->p_frame;
 353     //msg_Dbg( p_access, "sending frame %p",p_block );
 354     p_sys->p_frame = NULL;
 355     vlc_mutex_unlock( &p_sys->lock );
 356
 357     return p_block;
 358 }
 359
 360 static void* Raw1394EventThread( vlc_object_t *p_this )
 361 {
 362     event_thread_t *p_ev = (event_thread_t *) p_this;
 363     access_t *p_access = (access_t *) p_ev->p_access;
 364     access_sys_t *p_sys = (access_sys_t *) p_access->p_sys;
 365     int result = 0;
 366     int canc = vlc_savecancel ();
 367
 368     AVCPlay( p_access, p_sys->i_node );
 369
 370     while( vlc_object_alive (p_sys->p_ev) )
 371     {
 372         while( ( result = poll( &(p_sys->raw1394_poll), 1, 200 ) ) < 0 )
 373         {
 374             if( !( errno == EAGAIN || errno == EINTR ) )
 375             {
 376                 perror( "error: raw1394 poll" );
 377                 msg_Err( p_access, "retrying device raw1394" );
 378             }
 379         }
 380         if( !vlc_object_alive (p_sys->p_ev) )
 381                 break;
 382         if( result > 0 && ( ( p_sys->raw1394_poll.revents & POLLIN )
 383                 || ( p_sys->raw1394_poll.revents & POLLPRI ) ) )
 384             result = raw1394_loop_iterate( p_sys->p_raw1394 );
 385     }
 386
 387     AVCStop( p_access, p_sys->i_node );
 388     vlc_restorecancel (canc);
 389     return NULL;
 390 }
 391
 392 static int Raw1394Handler( raw1394handle_t handle, int channel, size_t length, quadlet_t *data )
 393 {
 394     access_t *p_access = NULL;
 395     access_sys_t *p_sys = NULL;
 396     block_t *p_block = NULL;
 397
 398     p_access = (access_t *) raw1394_get_userdata( handle );
 399     if( !p_access ) return 0;
 400
 401     p_sys = p_access->p_sys;
 402
 403     /* skip empty packets */
 404     if ( length > 16 )
 405     {
 406         unsigned char * p = ( unsigned char* ) &data[ 3 ];
 407         int section_type = p[ 0 ] >> 5;           /* section type is in bits 5 - 7 */
 408         int dif_sequence = p[ 1 ] >> 4;           /* dif sequence number is in bits 4 - 7 */
 409         int dif_block = p[ 2 ];
 410
 411         vlc_mutex_lock( &p_sys->p_ev->lock );
 412
 413         /* if we are at the beginning of a frame, we put the previous
 414            frame in our output_queue. */
 415         if( (section_type == 0) && (dif_sequence == 0) )
 416         {
 417             vlc_mutex_lock( &p_sys->lock );
 418             if( p_sys->p_ev->p_frame )
 419             {
 420                 /* Push current frame to p_access thread. */
 421                 //p_sys->p_ev->p_frame->i_pts = mdate();
 422                 block_ChainAppend( &p_sys->p_frame, p_sys->p_ev->p_frame );
 423             }
 424             /* reset list */
 425             p_sys->p_ev->p_frame = block_New( p_access, 144000 );
 426             p_sys->p_ev->pp_last = &p_sys->p_frame;
 427             vlc_mutex_unlock( &p_sys->lock );
 428         }
 429
 430         p_block = p_sys->p_ev->p_frame;
 431         if( p_block )
 432         {
 433             switch ( section_type )
 434             {
 435             case 0:    /* 1 Header block */
 436                 /* p[3] |= 0x80; // hack to force PAL data */
 437                 memcpy( p_block->p_buffer + dif_sequence * 150 * 80, p, 480 );
 438                 break;
 439
 440             case 1:    /* 2 Subcode blocks */
 441                 memcpy( p_block->p_buffer + dif_sequence * 150 * 80 + ( 1 + dif_block ) * 80, p, 480 );
 442                 break;
 443
 444             case 2:    /* 3 VAUX blocks */
 445                 memcpy( p_block->p_buffer + dif_sequence * 150 * 80 + ( 3 + dif_block ) * 80, p, 480 );
 446                 break;
 447
 448             case 3:    /* 9 Audio blocks interleaved with video */
 449                 memcpy( p_block->p_buffer + dif_sequence * 150 * 80 + ( 6 + dif_block * 16 ) * 80, p, 480 );
 450                 break;
 451
 452             case 4:    /* 135 Video blocks interleaved with audio */
 453                 memcpy( p_block->p_buffer + dif_sequence * 150 * 80 + ( 7 + ( dif_block / 15 ) + dif_block ) * 80, p, 480 );
 454                 break;
 455
 456             default:    /* we can´t handle any other data */
 457                 block_Release( p_block );
 458                 p_block = NULL;
 459                 break;
 460             }
 461         }
 462         vlc_mutex_unlock( &p_sys->p_ev->lock );
 463     }
 464     return 0;
 465 }
 466
 467 /*
 468  * Routing borrowed from dvgrab-1.8
 469  * Copyright by Arne Schirmacher <dvgrab@schirmacher.de>
 470  * Dan Dennedy <dan@dennedy.org> and others
 471  */
 472 static int Raw1394GetNumPorts( access_t *p_access )
 473 {
 474     int n_ports;
 475     struct raw1394_portinfo pinf[ 16 ];
 476     raw1394handle_t handle;
 477
 478     /* get a raw1394 handle */
 479     if ( !( handle = raw1394_new_handle() ) )
 480     {
 481         msg_Err( p_access, "raw1394 - failed to get handle: %m." );
 482         return VLC_EGENERIC;
 483     }
 484
 485     if ( ( n_ports = raw1394_get_port_info( handle, pinf, 16 ) ) < 0 )
 486     {
 487         msg_Err( p_access, "raw1394 - failed to get port info: %m.\n" );
 488         raw1394_destroy_handle( handle );
 489         return VLC_EGENERIC;
 490     }
 491     raw1394_destroy_handle( handle );
 492
 493     return n_ports;
 494 }
 495
 496 static raw1394handle_t Raw1394Open( access_t *p_access, int port )
 497 {
 498     int n_ports;
 499     struct raw1394_portinfo pinf[ 16 ];
 500     raw1394handle_t handle;
 501
 502     /* get a raw1394 handle */
 503 #ifdef RAW1394_V_0_8
 504
 505     handle = raw1394_get_handle();
 506 #else
 507
 508     handle = raw1394_new_handle();
 509 #endif
 510
 511     if ( !handle )
 512     {
 513         msg_Err( p_access, "raw1394 - failed to get handle: %m." );
 514         return NULL;
 515     }
 516
 517     if ( ( n_ports = raw1394_get_port_info( handle, pinf, 16 ) ) < 0 )
 518     {
 519         msg_Err( p_access, "raw1394 - failed to get port info: %m." );
 520         raw1394_destroy_handle( handle );
 521         return NULL;
 522     }
 523
 524     /* tell raw1394 which host adapter to use */
 525     if ( raw1394_set_port( handle, port ) < 0 )
 526     {
 527         msg_Err( p_access, "raw1394 - failed to set set port: %m." );
 528         return NULL;
 529     }
 530
 531     return handle;
 532 }
 533
 534 static void Raw1394Close( raw1394handle_t handle )
 535 {
 536     raw1394_destroy_handle( handle );
 537 }
 538
 539 static int DiscoverAVC( access_t *p_access, int* port, uint64_t guid )
 540 {
 541     rom1394_directory rom_dir;
 542     raw1394handle_t handle = NULL;
 543     int device = -1;
 544     int i, j = 0;
 545     int m = Raw1394GetNumPorts( p_access );
 546
 547     if( *port >= 0 )
 548     {
 549         /* search on explicit port */
 550         j = *port;
 551         m = *port + 1;
 552     }
 553
 554     for( ; j < m && device == -1; j++ )
 555     {
 556         handle = Raw1394Open( p_access, j );
 557         if( !handle )
 558             return -1;
 559
 560         for( i = 0; i < raw1394_get_nodecount( handle ); ++i )
 561         {
 562             if( guid != 0 )
 563             {
 564                 /* select explicitly by GUID */
 565                 if( guid == rom1394_get_guid( handle, i ) )
 566                 {
 567                     device = i;
 568                     *port = j;
 569                     break;
 570                 }
 571             }
 572             else
 573             {
 574                 /* select first AV/C Tape Reccorder Player node */
 575                 if( rom1394_get_directory( handle, i, &rom_dir ) < 0 )
 576                 {
 577                     msg_Err( p_access, "error reading config rom directory for node %d\n", i );
 578                     continue;
 579                 }
 580                 if( ( rom1394_get_node_type( &rom_dir ) == ROM1394_NODE_TYPE_AVC ) &&
 581                         avc1394_check_subunit_type( handle, i, AVC1394_SUBUNIT_TYPE_VCR ) )
 582                 {
 583                     device = i;
 584                     *port = j;
 585                     break;
 586                 }
 587             }
 588         }
 589         Raw1394Close( handle );
 590     }
 591
 592     return device;
 593 }
 594
 595 /*
 596  * Handle AVC commands
 597  */
 598 static raw1394handle_t AVCOpen( access_t *p_access, int port )
 599 {
 600     access_sys_t *p_sys = p_access->p_sys;
 601     int numcards;
 602     struct raw1394_portinfo pinf[ 16 ];
 603
 604     p_sys->p_avc1394 = raw1394_new_handle();
 605     if( !p_sys->p_avc1394 )
 606         return NULL;
 607
 608     numcards = raw1394_get_port_info( p_sys->p_avc1394, pinf, 16 );
 609     if( numcards < -1 )
 610         return NULL;
 611     if( raw1394_set_port( p_sys->p_avc1394, port ) < 0 )
 612         return NULL;
 613
 614     raw1394_set_bus_reset_handler( p_sys->p_avc1394, AVCResetHandler );
 615
 616     return  p_sys->p_avc1394;
 617 }
 618
 619 static void AVCClose( access_t *p_access )
 620 {
 621     access_sys_t *p_sys = p_access->p_sys;
 622
 623     if( p_sys->p_avc1394 )
 624     {
 625         raw1394_destroy_handle( p_sys->p_avc1394 );
 626         p_sys->p_avc1394 = NULL;
 627     }
 628 }
 629
 630
 631 static int AVCResetHandler( raw1394handle_t handle, unsigned int generation )
 632 {
 633     raw1394_update_generation( handle, generation );
 634     return 0;
 635 }
 636
 637 static int AVCPlay( access_t *p_access, int phyID )
 638 {
 639     access_sys_t *p_sys = p_access->p_sys;
 640
 641     msg_Dbg( p_access, "send play command over Digital Video control channel" );
 642     if( !p_sys->p_avc1394 )
 643         return 0;
 644
 645     if( phyID >= 0 )
 646     {
 647         if( !avc1394_vcr_is_recording( p_sys->p_avc1394, phyID ) &&
 648             avc1394_vcr_is_playing( p_sys->p_avc1394, phyID ) != AVC1394_VCR_OPERAND_PLAY_FORWARD )
 649                 avc1394_vcr_play( p_sys->p_avc1394, phyID );
 650     }
 651     return 0;
 652 }
 653
 654 static int AVCPause( access_t *p_access, int phyID )
 655 {
 656     access_sys_t *p_sys = p_access->p_sys;
 657
 658     if( !p_sys->p_avc1394 )
 659         return 0;
 660
 661     if( phyID >= 0 )
 662     {
 663         if( !avc1394_vcr_is_recording( p_sys->p_avc1394, phyID ) &&
 664             ( avc1394_vcr_is_playing( p_sys->p_avc1394, phyID ) != AVC1394_VCR_OPERAND_PLAY_FORWARD_PAUSE ) )
 665                 avc1394_vcr_pause( p_sys->p_avc1394, phyID );
 666     }
 667     return 0;
 668 }
 669
 670
 671 static int AVCStop( access_t *p_access, int phyID )
 672 {
 673     access_sys_t *p_sys = p_access->p_sys;
 674
 675     msg_Dbg( p_access, "closing Digital Video control channel" );
 676     if( !p_sys->p_avc1394 )
 677         return 0;
 678
 679     if ( phyID >= 0 )
 680         avc1394_vcr_stop( p_sys->p_avc1394, phyID );
 681
 682     return 0;
 683 }