modules/access/attachment.c

   1 /*****************************************************************************
   2  * attachment.c: Input reading an attachment.
   3  *****************************************************************************
   4  * Copyright (C) 2009 Laurent Aimar
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 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 General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_access.h>
  35 #include <vlc_input.h>
  36
  37 /*****************************************************************************
  38  * Module descriptor
  39  *****************************************************************************/
  40 static int  Open (vlc_object_t *);
  41 static void Close(vlc_object_t *);
  42
  43 vlc_module_begin()
  44     set_shortname(N_("Attachment"))
  45     set_description(N_("Attachment input"))
  46     set_category(CAT_INPUT)
  47     set_subcategory(SUBCAT_INPUT_ACCESS)
  48
  49     set_capability("access", 0)
  50     add_shortcut("attachment")
  51     set_callbacks(Open, Close)
  52 vlc_module_end()
  53
  54 /*****************************************************************************
  55  * Local prototypes
  56  *****************************************************************************/
  57 struct access_sys_t {
  58     input_attachment_t *a;
  59 };
  60
  61 static ssize_t Read(access_t *, uint8_t *, size_t);
  62 static int     Seek(access_t *, uint64_t);
  63 static int     Control(access_t *, int, va_list);
  64
  65 /* */
  66 static int Open(vlc_object_t *object)
  67 {
  68     access_t     *access = (access_t *)object;
  69     access_sys_t *sys;
  70
  71     input_thread_t *input = access_GetParentInput(access);
  72     if (!input)
  73         return VLC_EGENERIC;
  74
  75     input_attachment_t *a;
  76     if (input_Control(input, INPUT_GET_ATTACHMENT, &a, access->psz_location))
  77         a = NULL;
  78
  79     vlc_object_release(input);
  80
  81     if (!a) {
  82         msg_Err(access, "Failed to find the attachment '%s'",
  83                 access->psz_location);
  84         return VLC_EGENERIC;
  85     }
  86
  87     /* */
  88     access->p_sys = sys = malloc(sizeof(*sys));
  89     if (!sys) {
  90         vlc_input_attachment_Delete(a);
  91         return VLC_ENOMEM;
  92     }
  93     sys->a = a;
  94
  95     /* */
  96     access_InitFields(access);
  97     access->pf_read    = Read;
  98     access->pf_block   = NULL;
  99     access->pf_control = Control;
 100     access->pf_seek    = Seek;
 101
 102     return VLC_SUCCESS;
 103 }
 104
 105 /* */
 106 static void Close(vlc_object_t *object)
 107 {
 108     access_t     *access = (access_t *)object;
 109     access_sys_t *sys = access->p_sys;
 110
 111     vlc_input_attachment_Delete(sys->a);
 112     free(sys);
 113 }
 114
 115 /* */
 116 static ssize_t Read(access_t *access, uint8_t *buffer, size_t size)
 117 {
 118     access_sys_t *sys = access->p_sys;
 119
 120     access->info.b_eof = access->info.i_pos >= sys->a->i_data;
 121     if (access->info.b_eof)
 122         return 0;
 123
 124     const size_t copy = __MIN(size, sys->a->i_data - access->info.i_pos);
 125     memcpy(buffer, (uint8_t*)sys->a->p_data + access->info.i_pos, copy);
 126     access->info.i_pos += copy;
 127     return copy;
 128 }
 129
 130 /* */
 131 static int Seek(access_t *access, uint64_t position)
 132 {
 133     access->info.i_pos = position;
 134     access->info.b_eof = false;
 135     return VLC_SUCCESS;
 136 }
 137
 138 /* */
 139 static int Control(access_t *access, int query, va_list args)
 140 {
 141     VLC_UNUSED(access);
 142     switch (query)
 143     {
 144     /* */
 145     case ACCESS_CAN_SEEK:
 146     case ACCESS_CAN_FASTSEEK:
 147     case ACCESS_CAN_PAUSE:
 148     case ACCESS_CAN_CONTROL_PACE: {
 149         bool *b = va_arg(args, bool*);
 150         *b = true;
 151         return VLC_SUCCESS;
 152     }
 153     case ACCESS_GET_PTS_DELAY: {
 154         int64_t *d = va_arg(args, int64_t *);
 155         *d = DEFAULT_PTS_DELAY;
 156         return VLC_SUCCESS;
 157     }
 158     case ACCESS_SET_PAUSE_STATE:
 159         return VLC_SUCCESS;
 160
 161     default:
 162         return VLC_EGENERIC;
 163     }
 164 }
 165