src/input/stream_filter.c

   1 /*****************************************************************************
   2  * stream_filter.c
   3  *****************************************************************************
   4  * Copyright (C) 2008 Laurent Aimar
   5  *
   6  * Author: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 #ifdef HAVE_CONFIG_H
  24 # include "config.h"
  25 #endif
  26
  27 #include <vlc_common.h>
  28 #include <vlc_stream.h>
  29 #include <vlc_modules.h>
  30 #include <libvlc.h>
  31
  32 #include <assert.h>
  33
  34 #include "stream.h"
  35
  36 struct vlc_stream_filter_private
  37 {
  38     module_t *module;
  39 };
  40
  41 static void StreamDelete(stream_t *s)
  42 {
  43     struct vlc_stream_filter_private *priv = vlc_stream_Private(s);
  44
  45     module_unneed(s, priv->module);
  46     vlc_stream_Delete(s->s);
  47     free(s->psz_filepath);
  48 }
  49
  50 stream_t *vlc_stream_FilterNew( stream_t *p_source,
  51                                 const char *psz_stream_filter )
  52 {
  53     assert(p_source != NULL);
  54
  55     struct vlc_stream_filter_private *priv;
  56     stream_t *s = vlc_stream_CustomNew(p_source->obj.parent, StreamDelete,
  57                                        sizeof (*priv), "stream filter");
  58     if( s == NULL )
  59         return NULL;
  60
  61     priv = vlc_stream_Private(s);
  62     s->p_input_item = p_source->p_input_item;
  63
  64     if( p_source->psz_url != NULL )
  65     {
  66         s->psz_url = strdup( p_source->psz_url );
  67         if( unlikely(s->psz_url == NULL) )
  68             goto error;
  69
  70         if( p_source->psz_filepath != NULL )
  71             s->psz_filepath = strdup( p_source->psz_filepath );
  72     }
  73     s->s = p_source;
  74
  75     /* */
  76     priv->module = module_need(s, "stream_filter", psz_stream_filter, true);
  77     if (priv->module == NULL)
  78         goto error;
  79
  80     return s;
  81 error:
  82     free(s->psz_filepath);
  83     stream_CommonDelete( s );
  84     return NULL;
  85 }
  86
  87 /* Add automatic stream filter */
  88 stream_t *stream_FilterAutoNew( stream_t *p_source )
  89 {
  90     /* Limit number of entries to avoid infinite recursion. */
  91     for( unsigned i = 0; i < 16; i++ )
  92     {
  93         stream_t *p_filter = vlc_stream_FilterNew( p_source, NULL );
  94         if( p_filter == NULL )
  95             break;
  96
  97         msg_Dbg( p_filter, "stream filter added to %p", (void *)p_source );
  98         p_source = p_filter;
  99     }
 100     return p_source;
 101 }
 102
 103 /* Add specified stream filter(s) */
 104 stream_t *stream_FilterChainNew( stream_t *p_source, const char *psz_chain )
 105 {
 106     /* Add user stream filter */
 107     char *chain = strdup( psz_chain );
 108     if( unlikely(chain == NULL) )
 109         return p_source;
 110
 111     char *buf;
 112     for( const char *name = strtok_r( chain, ":", &buf );
 113          name != NULL;
 114          name = strtok_r( NULL, ":", &buf ) )
 115     {
 116         stream_t *p_filter = vlc_stream_FilterNew( p_source, name );
 117         if( p_filter != NULL )
 118             p_source = p_filter;
 119         else
 120             msg_Warn( p_source, "cannot insert stream filter %s", name );
 121     }
 122     free( chain );
 123
 124     return p_source;
 125 }