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 struct vlc_stream_filter_private
  38 {
  39     module_t *module;
  40 };
  41
  42 static void StreamDelete(stream_t *s)
  43 {
  44     struct vlc_stream_filter_private *priv = vlc_stream_Private(s);
  45
  46     module_unneed(s, priv->module);
  47     vlc_stream_Delete(s->s);
  48     free(s->psz_filepath);
  49 }
  50
  51 stream_t *vlc_stream_FilterNew( stream_t *p_source,
  52                                 const char *psz_stream_filter )
  53 {
  54     assert(p_source != NULL);
  55
  56     struct vlc_stream_filter_private *priv;
  57     stream_t *s = vlc_stream_CustomNew(p_source->obj.parent, StreamDelete,
  58                                        sizeof (*priv), "stream filter");
  59     if( s == NULL )
  60         return NULL;
  61
  62     priv = vlc_stream_Private(s);
  63     s->p_input_item = p_source->p_input_item;
  64
  65     if( p_source->psz_url != NULL )
  66     {
  67         s->psz_url = strdup( p_source->psz_url );
  68         if( unlikely(s->psz_url == NULL) )
  69             goto error;
  70
  71         if( p_source->psz_filepath != NULL )
  72             s->psz_filepath = strdup( p_source->psz_filepath );
  73     }
  74     s->s = p_source;
  75
  76     /* */
  77     priv->module = module_need(s, "stream_filter", psz_stream_filter, true);
  78     if (priv->module == NULL)
  79         goto error;
  80
  81     return s;
  82 error:
  83     free(s->psz_filepath);
  84     stream_CommonDelete( s );
  85     return NULL;
  86 }
  87
  88 /* Add automatic stream filter */
  89 stream_t *stream_FilterAutoNew( stream_t *p_source )
  90 {
  91     /* Limit number of entries to avoid infinite recursion. */
  92     for( unsigned i = 0; i < 16; i++ )
  93     {
  94         stream_t *p_filter = vlc_stream_FilterNew( p_source, NULL );
  95         if( p_filter == NULL )
  96             break;
  97
  98         msg_Dbg( p_filter, "stream filter added to %p", (void *)p_source );
  99         p_source = p_filter;
 100     }
 101     return p_source;
 102 }
 103
 104 /* Add specified stream filter(s) */
 105 stream_t *stream_FilterChainNew( stream_t *p_source, const char *psz_chain )
 106 {
 107     /* Add user stream filter */
 108     char *chain = strdup( psz_chain );
 109     if( unlikely(chain == NULL) )
 110         return p_source;
 111
 112     char *buf;
 113     for( const char *name = strtok_r( chain, ":", &buf );
 114          name != NULL;
 115          name = strtok_r( NULL, ":", &buf ) )
 116     {
 117         stream_t *p_filter = vlc_stream_FilterNew( p_source, name );
 118         if( p_filter != NULL )
 119             p_source = p_filter;
 120         else
 121             msg_Warn( p_source, "cannot insert stream filter %s", name );
 122     }
 123     free( chain );
 124
 125     return p_source;
 126 }