modules/access/sdp.c

   1 /*****************************************************************************
   2  * sdp.c: Fake input for sdp:// scheme
   3  *****************************************************************************
   4  * Copyright (C) 2010 Rémi Denis-Courmont
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include "config.h"
  23 #endif
  24
  25 #include <limits.h>
  26 #include <string.h>
  27
  28 #include <vlc_common.h>
  29 #include <vlc_plugin.h>
  30 #include <vlc_access.h>
  31
  32 static int Open (vlc_object_t *);
  33
  34 vlc_module_begin ()
  35     set_shortname (N_("SDP"))
  36     set_description (N_("Session Description Protocol"))
  37     set_category (CAT_INPUT)
  38     set_subcategory (SUBCAT_INPUT_ACCESS)
  39
  40     set_capability ("access", 0)
  41     set_callbacks (Open, NULL)
  42     add_shortcut ("sdp")
  43 vlc_module_end()
  44
  45 static ssize_t Read (stream_t *, void *, size_t);
  46 static int Seek (stream_t *, uint64_t);
  47 static int Control (stream_t *, int, va_list);
  48
  49 static int Open (vlc_object_t *obj)
  50 {
  51     stream_t *access = (stream_t *)obj;
  52
  53     access->pf_read = Read;
  54     access->pf_block = NULL;
  55     access->pf_seek = Seek;
  56     access->pf_control = Control;
  57     access->p_sys = (char *)access->psz_location;
  58
  59     return VLC_SUCCESS;
  60 }
  61
  62 static ssize_t Read (stream_t *access, void *buf, size_t len)
  63 {
  64     char *in = access->p_sys, *out = buf;
  65     size_t i;
  66
  67     for (i = 0; i < len && *in != '\0'; i++)
  68         *(out++) = *(in++);
  69
  70     access->p_sys = in;
  71     return i;
  72 }
  73
  74 static int Seek (stream_t *access, uint64_t position)
  75 {
  76 #if (UINT64_MAX > SIZE_MAX)
  77     if (unlikely(position > SIZE_MAX))
  78         position = SIZE_MAX;
  79 #endif
  80     access->p_sys = (char *)access->psz_location
  81                     + strnlen(access->psz_location, position);
  82     return VLC_SUCCESS;
  83 }
  84
  85 static int Control (stream_t *access, int query, va_list args)
  86 {
  87     switch (query)
  88     {
  89         case STREAM_CAN_SEEK:
  90         case STREAM_CAN_FASTSEEK:
  91         case STREAM_CAN_PAUSE:
  92         case STREAM_CAN_CONTROL_PACE:
  93         {
  94             bool *b = va_arg(args, bool *);
  95             *b = true;
  96             return VLC_SUCCESS;
  97         }
  98
  99         case STREAM_GET_SIZE:
 100             *va_arg(args, uint64_t *) = strlen(access->psz_location);
 101             return VLC_SUCCESS;
 102
 103         case STREAM_GET_PTS_DELAY:
 104         {
 105             int64_t *dp = va_arg(args, int64_t *);
 106             *dp = DEFAULT_PTS_DELAY;
 107             return VLC_SUCCESS;
 108         }
 109
 110         case STREAM_SET_PAUSE_STATE:
 111             return VLC_SUCCESS;
 112     }
 113     return VLC_EGENERIC;
 114 }