modules/misc/dummy/input.c

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