src/input/stream_filter.c

   1 /*****************************************************************************
   2  * stream_filter.c
   3  *****************************************************************************
   4  * Copyright (C) 2008 Laurent Aimar
   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
  28 #include <vlc_common.h>
  29 #include <vlc_stream.h>
  30 #include <vlc_modules.h>
  31 #include <libvlc.h>
  32
  33 #include <assert.h>
  34
  35 #include "stream.h"
  36
  37 static void StreamDelete( stream_t * );
  38
  39 stream_t *vlc_stream_FilterNew( stream_t *p_source,
  40                                 const char *psz_stream_filter )
  41 {
  42     stream_t *s;
  43     assert( p_source != NULL );
  44
  45     s = vlc_stream_CommonNew( p_source->obj.parent, StreamDelete );
  46     if( s == NULL )
  47         return NULL;
  48
  49     s->p_input = p_source->p_input;
  50
  51     if( p_source->psz_url != NULL )
  52     {
  53         s->psz_url = strdup( p_source->psz_url );
  54         if( unlikely(s->psz_url == NULL) )
  55             goto error;
  56     }
  57     s->p_source = p_source;
  58
  59     /* */
  60     s->p_module = module_need( s, "stream_filter", psz_stream_filter, true );
  61     if( s->p_module == NULL )
  62         goto error;
  63
  64     return s;
  65 error:
  66     stream_CommonDelete( s );
  67     return NULL;
  68 }
  69
  70 /* Add automatic stream filter */
  71 stream_t *stream_FilterAutoNew( stream_t *p_source )
  72 {
  73     /* Limit number of entries to avoid infinite recursion. */
  74     for( unsigned i = 0; i < 16; i++ )
  75     {
  76         stream_t *p_filter = vlc_stream_FilterNew( p_source, NULL );
  77         if( p_filter == NULL )
  78             break;
  79
  80         msg_Dbg( p_filter, "stream filter added to %p", (void *)p_source );
  81         p_source = p_filter;
  82     }
  83     return p_source;
  84 }
  85
  86 /* Add specified stream filter(s) */
  87 stream_t *stream_FilterChainNew( stream_t *p_source, const char *psz_chain )
  88 {
  89     /* Add user stream filter */
  90     char *chain = strdup( psz_chain );
  91     if( unlikely(chain == NULL) )
  92         return p_source;
  93
  94     char *buf;
  95     for( const char *name = strtok_r( chain, ":", &buf );
  96          name != NULL;
  97          name = strtok_r( NULL, ":", &buf ) )
  98     {
  99         stream_t *p_filter = vlc_stream_FilterNew( p_source, name );
 100         if( p_filter != NULL )
 101             p_source = p_filter;
 102         else
 103             msg_Warn( p_source, "cannot insert stream filter %s", name );
 104     }
 105     free( chain );
 106
 107     return p_source;
 108 }
 109
 110 static void StreamDelete( stream_t *s )
 111 {
 112     module_unneed( s, s->p_module );
 113
 114     if( s->p_source )
 115         vlc_stream_Delete( s->p_source );
 116 }
 117
 118 int vlc_stream_FilterDefaultReadDir( stream_t *s, input_item_node_t *p_node )
 119 {
 120     assert( s->p_source != NULL );
 121     return vlc_stream_ReadDir( s->p_source, p_node );
 122 }