modules/access/idummy.c

   1 /*****************************************************************************
   2  * idummy.c: dummy input plugin, to manage "vlc://" special options
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.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_interface.h>
  35 #include <vlc_demux.h>
  36 #include <vlc_charset.h>
  37
  38 static int OpenDemux( vlc_object_t * );
  39 static void CloseDemux( vlc_object_t * );
  40
  41 vlc_module_begin ()
  42     set_shortname( N_("Dummy") )
  43     set_description( N_("Dummy input") )
  44     set_capability( "access_demux", 0 )
  45     set_callbacks( OpenDemux, CloseDemux )
  46     add_shortcut( "dummy", "vlc" )
  47 vlc_module_end ()
  48
  49 static int DemuxControl( demux_t *, int, va_list );
  50
  51 static int DemuxNoOp( demux_t *demux )
  52 {
  53     (void) demux;
  54     return 0;
  55 }
  56
  57 static int DemuxHold( demux_t *demux )
  58 {
  59     (void) demux;
  60     msleep( 10000 ); /* FIXME!!! */
  61     return 1;
  62 }
  63
  64 struct demux_sys_t
  65 {
  66     mtime_t end;
  67     mtime_t length;
  68 };
  69
  70 static int DemuxPause( demux_t *demux )
  71 {
  72     demux_sys_t *p_sys = demux->p_sys;
  73     mtime_t now = mdate();
  74
  75     if( now >= p_sys->end )
  76         return 0;
  77
  78     msleep( 10000 ); /* FIXME!!! */
  79     return 1;
  80 }
  81
  82 static int ControlPause( demux_t *demux, int query, va_list args )
  83 {
  84     demux_sys_t *p_sys = demux->p_sys;
  85
  86     switch( query )
  87     {
  88         case DEMUX_GET_POSITION:
  89         {
  90             double *ppos = va_arg( args, double * );
  91             double pos;
  92             mtime_t now = mdate();
  93
  94             pos = 1. + ((double)(now - p_sys->end) / (double)p_sys->length);
  95             *ppos = (pos <= 1.) ? pos : 1.;
  96             break;
  97         }
  98
  99         case DEMUX_SET_POSITION:
 100         {
 101             double pos = va_arg( args, double );
 102             mtime_t now = mdate();
 103
 104             p_sys->end = now + (p_sys->length * (1. - pos));
 105             break;
 106         }
 107
 108         case DEMUX_GET_LENGTH:
 109         {
 110             mtime_t *plen = va_arg( args, mtime_t * );
 111             *plen = p_sys->length;
 112             break;
 113         }
 114
 115         case DEMUX_GET_TIME:
 116         {
 117             mtime_t *ppos = va_arg( args, mtime_t * );
 118             *ppos = mdate() + p_sys->length - p_sys->end;
 119             break;
 120         }
 121
 122         case DEMUX_SET_TIME:
 123         {
 124             mtime_t pos = va_arg( args, mtime_t );
 125             p_sys->end = mdate() + p_sys->length - pos;
 126             break;
 127         }
 128
 129         case DEMUX_CAN_SEEK:
 130             *va_arg( args, bool * ) = true;
 131             break;
 132
 133         default:
 134             return DemuxControl( demux, query, args );
 135     }
 136     return VLC_SUCCESS;
 137 }
 138
 139 /*****************************************************************************
 140  * OpenDemux: initialize the target, ie. parse the command
 141  *****************************************************************************/
 142 static int OpenDemux( vlc_object_t *p_this )
 143 {
 144     demux_t *p_demux = (demux_t*)p_this;
 145     char * psz_name = p_demux->psz_location;
 146
 147     p_demux->p_sys = NULL;
 148
 149     /* Check for a "vlc://nop" command */
 150     if( !strcasecmp( psz_name, "nop" ) )
 151     {
 152 nop:
 153         msg_Info( p_demux, "command `nop'" );
 154         p_demux->pf_demux = DemuxNoOp;
 155         p_demux->pf_control = DemuxControl;
 156         return VLC_SUCCESS;
 157     }
 158
 159     /* Check for a "vlc://quit" command */
 160     if( !strcasecmp( psz_name, "quit" ) )
 161     {
 162         msg_Info( p_demux, "command `quit'" );
 163         p_demux->pf_demux = DemuxNoOp;
 164         p_demux->pf_control = DemuxControl;
 165         libvlc_Quit( p_demux->p_libvlc );
 166         return VLC_SUCCESS;
 167     }
 168
 169     if( !strcasecmp( psz_name, "pause" ) )
 170     {
 171         msg_Info( p_demux, "command `pause'" );
 172
 173         p_demux->pf_demux = DemuxHold;
 174         p_demux->pf_control = DemuxControl;
 175         return VLC_SUCCESS;
 176     }
 177
 178     /* Check for a "vlc://pause:***" command */
 179     if( !strncasecmp( psz_name, "pause:", 6 ) )
 180     {
 181         double f = us_atof( psz_name + 6 );
 182         mtime_t length = f * CLOCK_FREQ;
 183
 184         msg_Info( p_demux, "command `pause %f'", f );
 185         if( length == 0 )
 186             goto nop; /* avoid division by zero */
 187
 188         demux_sys_t *p_sys = malloc( sizeof( *p_sys ) );
 189         if( p_sys == NULL )
 190             return VLC_ENOMEM;
 191
 192         p_sys->end = mdate() + length;
 193         p_sys->length = length;
 194
 195         p_demux->p_sys = p_sys;
 196         p_demux->pf_demux = DemuxPause;
 197         p_demux->pf_control = ControlPause;
 198         return VLC_SUCCESS;
 199     }
 200
 201     msg_Err( p_demux, "unknown command `%s'", psz_name );
 202     return VLC_EGENERIC;
 203 }
 204
 205 /*****************************************************************************
 206  * CloseDemux: initialize the target, ie. parse the command
 207  *****************************************************************************/
 208 static void CloseDemux( vlc_object_t *p_this )
 209 {
 210     demux_t *p_demux = (demux_t*)p_this;
 211
 212     free( p_demux->p_sys );
 213 }
 214
 215 static int DemuxControl( demux_t *p_demux, int i_query, va_list args )
 216 {
 217     (void)p_demux; (void)i_query; (void)args;
 218     switch( i_query )
 219     {
 220     case DEMUX_GET_PTS_DELAY:
 221     {
 222         int64_t *pi_pts_delay = va_arg( args, int64_t * );
 223         *pi_pts_delay = DEFAULT_PTS_DELAY;
 224         return VLC_SUCCESS;
 225     }
 226     default:
 227         return VLC_EGENERIC;
 228     }
 229 }