git.sesse.net Git - vlc/blob - src/input/stream_demux.c

   1 /*****************************************************************************
   2  * stream_demux.c
   3  *****************************************************************************
   4  * Copyright (C) 1999-2008 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Author: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27 #include <limits.h>
  28
  29 #include "demux.h"
  30 #include <libvlc.h>
  31 #include <vlc_codec.h>
  32
  33 /****************************************************************************
  34  * stream_Demux*: create a demuxer for an outpout stream (allow demuxer chain)
  35  ****************************************************************************/
  36 struct stream_sys_t
  37 {
  38     /* Data buffer */
  39     block_fifo_t *p_fifo;
  40     block_t      *p_block;
  41
  42     uint64_t    i_pos;
  43
  44     /* Demuxer */
  45     char        *psz_name;
  46     es_out_t    *out;
  47
  48     vlc_thread_t thread;
  49     vlc_mutex_t  lock;
  50     struct
  51     {
  52         double  position;
  53         int64_t length;
  54         int64_t time;
  55     } stats;
  56 };
  57
  58 static int  DStreamRead   ( stream_t *, void *p_read, unsigned int i_read );
  59 static int  DStreamPeek   ( stream_t *, const uint8_t **pp_peek, unsigned int i_peek );
  60 static int  DStreamControl( stream_t *, int i_query, va_list );
  61 static void DStreamDelete ( stream_t * );
  62 static void* DStreamThread ( void * );
  63
  64
  65 stream_t *stream_DemuxNew( demux_t *p_demux, const char *psz_demux, es_out_t *out )
  66 {
  67     vlc_object_t *p_obj = VLC_OBJECT(p_demux);
  68     /* We create a stream reader, and launch a thread */
  69     stream_t     *s;
  70     stream_sys_t *p_sys;
  71
  72     s = stream_CommonNew( p_obj );
  73     if( s == NULL )
  74         return NULL;
  75     s->p_input = p_demux->p_input;
  76     s->psz_path  = strdup(""); /* N/A */
  77     s->pf_read   = DStreamRead;
  78     s->pf_peek   = DStreamPeek;
  79     s->pf_control= DStreamControl;
  80     s->pf_destroy= DStreamDelete;
  81
  82     s->p_sys = p_sys = malloc( sizeof( *p_sys) );
  83     if( !s->psz_path || !s->p_sys )
  84     {
  85         stream_CommonDelete( s );
  86         return NULL;
  87     }
  88
  89     p_sys->i_pos = 0;
  90     p_sys->out = out;
  91     p_sys->p_block = NULL;
  92     p_sys->psz_name = strdup( psz_demux );
  93     p_sys->stats.position = 0.;
  94     p_sys->stats.length = 0;
  95     p_sys->stats.time = 0;
  96
  97     /* decoder fifo */
  98     if( ( p_sys->p_fifo = block_FifoNew() ) == NULL )
  99     {
 100         stream_CommonDelete( s );
 101         free( p_sys->psz_name );
 102         free( p_sys );
 103         return NULL;
 104     }
 105
 106     vlc_mutex_init( &p_sys->lock );
 107
 108     if( vlc_clone( &p_sys->thread, DStreamThread, s, VLC_THREAD_PRIORITY_INPUT ) )
 109     {
 110         vlc_mutex_destroy( &p_sys->lock );
 111         block_FifoRelease( p_sys->p_fifo );
 112         stream_CommonDelete( s );
 113         free( p_sys->psz_name );
 114         free( p_sys );
 115         return NULL;
 116     }
 117
 118     return s;
 119 }
 120
 121 void stream_DemuxSend( stream_t *s, block_t *p_block )
 122 {
 123     stream_sys_t *p_sys = s->p_sys;
 124     block_FifoPut( p_sys->p_fifo, p_block );
 125 }
 126
 127 int stream_DemuxControlVa( stream_t *s, int query, va_list args )
 128 {
 129     stream_sys_t *sys = s->p_sys;
 130
 131     switch( query )
 132     {
 133         case DEMUX_GET_POSITION:
 134             vlc_mutex_lock( &sys->lock );
 135             *va_arg( args, double * ) = sys->stats.position;
 136             vlc_mutex_unlock( &sys->lock );
 137             break;
 138         case DEMUX_GET_LENGTH:
 139             vlc_mutex_lock( &sys->lock );
 140             *va_arg( args, int64_t * ) = sys->stats.length;
 141             vlc_mutex_unlock( &sys->lock );
 142             break;
 143         case DEMUX_GET_TIME:
 144             vlc_mutex_lock( &sys->lock );
 145             *va_arg( args, int64_t * ) = sys->stats.time;
 146             vlc_mutex_unlock( &sys->lock );
 147             break;
 148         default:
 149             return VLC_EGENERIC;
 150     }
 151     return VLC_SUCCESS;
 152 }
 153
 154 static void DStreamDelete( stream_t *s )
 155 {
 156     stream_sys_t *p_sys = s->p_sys;
 157     block_t *p_empty;
 158
 159     vlc_object_kill( s );
 160     p_empty = block_Alloc( 0 );
 161     block_FifoPut( p_sys->p_fifo, p_empty );
 162     vlc_join( p_sys->thread, NULL );
 163     vlc_mutex_destroy( &p_sys->lock );
 164
 165     if( p_sys->p_block )
 166         block_Release( p_sys->p_block );
 167
 168     block_FifoRelease( p_sys->p_fifo );
 169     free( p_sys->psz_name );
 170     free( p_sys );
 171     stream_CommonDelete( s );
 172 }
 173
 174
 175 static int DStreamRead( stream_t *s, void *p_read, unsigned int i_read )
 176 {
 177     stream_sys_t *p_sys = s->p_sys;
 178     uint8_t *p_out = p_read;
 179     int i_out = 0;
 180
 181     //msg_Dbg( s, "DStreamRead: wanted %d bytes", i_read );
 182
 183     while( vlc_object_alive( s ) && !s->b_error && i_read )
 184     {
 185         block_t *p_block = p_sys->p_block;
 186         int i_copy;
 187
 188         if( !p_block )
 189         {
 190             p_block = block_FifoGet( p_sys->p_fifo );
 191             if( !p_block ) s->b_error = 1;
 192             p_sys->p_block = p_block;
 193         }
 194
 195         if( p_block && i_read )
 196         {
 197             i_copy = __MIN( i_read, p_block->i_buffer );
 198             if( p_out && i_copy ) memcpy( p_out, p_block->p_buffer, i_copy );
 199             i_read -= i_copy;
 200             p_out += i_copy;
 201             i_out += i_copy;
 202             p_block->i_buffer -= i_copy;
 203             p_block->p_buffer += i_copy;
 204
 205             if( !p_block->i_buffer )
 206             {
 207                 block_Release( p_block );
 208                 p_sys->p_block = NULL;
 209             }
 210         }
 211     }
 212
 213     p_sys->i_pos += i_out;
 214     return i_out;
 215 }
 216
 217 static int DStreamPeek( stream_t *s, const uint8_t **pp_peek, unsigned int i_peek )
 218 {
 219     stream_sys_t *p_sys = s->p_sys;
 220     block_t **pp_block = &p_sys->p_block;
 221     int i_out = 0;
 222     *pp_peek = 0;
 223
 224     //msg_Dbg( s, "DStreamPeek: wanted %d bytes", i_peek );
 225
 226     while( vlc_object_alive( s ) && !s->b_error && i_peek )
 227     {
 228         int i_copy;
 229
 230         if( !*pp_block )
 231         {
 232             *pp_block = block_FifoGet( p_sys->p_fifo );
 233             if( !*pp_block ) s->b_error = 1;
 234         }
 235
 236         if( *pp_block && i_peek )
 237         {
 238             i_copy = __MIN( i_peek, (*pp_block)->i_buffer );
 239             i_peek -= i_copy;
 240             i_out += i_copy;
 241
 242             if( i_peek ) pp_block = &(*pp_block)->p_next;
 243         }
 244     }
 245
 246     if( p_sys->p_block )
 247     {
 248         p_sys->p_block = block_ChainGather( p_sys->p_block );
 249         *pp_peek = p_sys->p_block->p_buffer;
 250     }
 251
 252     return i_out;
 253 }
 254
 255 static int DStreamControl( stream_t *s, int i_query, va_list args )
 256 {
 257     stream_sys_t *p_sys = s->p_sys;
 258     uint64_t    *p_i64;
 259     bool *p_b;
 260
 261     switch( i_query )
 262     {
 263         case STREAM_GET_SIZE:
 264             p_i64 = va_arg( args, uint64_t * );
 265             *p_i64 = 0;
 266             return VLC_SUCCESS;
 267
 268         case STREAM_CAN_SEEK:
 269             p_b = (bool*) va_arg( args, bool * );
 270             *p_b = false;
 271             return VLC_SUCCESS;
 272
 273         case STREAM_CAN_FASTSEEK:
 274             p_b = (bool*) va_arg( args, bool * );
 275             *p_b = false;
 276             return VLC_SUCCESS;
 277
 278         case STREAM_GET_POSITION:
 279             p_i64 = va_arg( args, uint64_t * );
 280             *p_i64 = p_sys->i_pos;
 281             return VLC_SUCCESS;
 282
 283         case STREAM_SET_POSITION:
 284         {
 285             uint64_t i64 = va_arg( args, uint64_t );
 286             if( i64 < p_sys->i_pos )
 287                 return VLC_EGENERIC;
 288
 289             uint64_t i_skip = i64 - p_sys->i_pos;
 290             while( i_skip > 0 )
 291             {
 292                 int i_read = DStreamRead( s, NULL, __MIN(i_skip, INT_MAX) );
 293                 if( i_read <= 0 )
 294                     return VLC_EGENERIC;
 295                 i_skip -= i_read;
 296             }
 297             return VLC_SUCCESS;
 298         }
 299
 300         case STREAM_CONTROL_ACCESS:
 301         case STREAM_GET_CONTENT_TYPE:
 302         case STREAM_SET_RECORD_STATE:
 303             return VLC_EGENERIC;
 304
 305         default:
 306             msg_Err( s, "invalid DStreamControl query=0x%x", i_query );
 307             return VLC_EGENERIC;
 308     }
 309 }
 310
 311 static void* DStreamThread( void *obj )
 312 {
 313     stream_t *s = (stream_t *)obj;
 314     stream_sys_t *p_sys = s->p_sys;
 315     demux_t *p_demux;
 316
 317     /* Create the demuxer */
 318     p_demux = demux_New( s, s->p_input, "", p_sys->psz_name, "", s, p_sys->out,
 319                          false );
 320     if( p_demux == NULL )
 321         return NULL;
 322
 323     /* stream_Demux cannot apply DVB filters.
 324      * Get all programs and let the E/S output sort them out. */
 325     demux_Control( p_demux, DEMUX_SET_GROUP, -1, NULL );
 326
 327     /* Main loop */
 328     mtime_t next_update = 0;
 329     while( vlc_object_alive( s ) )
 330     {
 331         if( p_demux->info.i_update || mdate() >= next_update )
 332         {
 333             double newpos;
 334             int64_t newlen, newtime;
 335
 336             if( demux_Control( p_demux, DEMUX_GET_POSITION, &newpos ) )
 337                 newpos = 0.;
 338             if( demux_Control( p_demux, DEMUX_GET_LENGTH, &newlen ) )
 339                 newlen = 0;
 340             if( demux_Control( p_demux, DEMUX_GET_TIME, &newtime ) )
 341                 newtime = 0;
 342
 343             vlc_mutex_lock( &p_sys->lock );
 344             p_sys->stats.position = newpos;
 345             p_sys->stats.length = newlen;
 346             p_sys->stats.time = newtime;
 347             vlc_mutex_unlock( &p_sys->lock );
 348
 349             p_demux->info.i_update = 0;
 350             next_update = mdate() + (CLOCK_FREQ / 4);
 351         }
 352
 353         if( demux_Demux( p_demux ) <= 0 )
 354             break;
 355     }
 356
 357     demux_Delete( p_demux );
 358
 359     return NULL;
 360 }