modules/access/mtp.c

   1 /*****************************************************************************
   2  * mtp.c: mtp input (mtp: access plug-in)
   3  *****************************************************************************
   4  * Copyright (C) 2001-2006 VLC authors and VideoLAN
   5  * Copyright © 2006-2008 Rémi Denis-Courmont
   6  *
   7  * Authors: Fabio Ritrovato <exsephiroth87@gmail.com>
   8  * Original file.c: Christophe Massiot <massiot@via.ecp.fr>
   9  *                  Rémi Denis-Courmont <rem # videolan # org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU Lesser General Public License as published by
  13  * the Free Software Foundation; either version 2.1 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public License
  22  * along with this program; if not, write to the Free Software Foundation,
  23  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <assert.h>
  34 #include <errno.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <fcntl.h>
  38 #include <unistd.h>
  39
  40 #include <vlc_common.h>
  41 #include <vlc_plugin.h>
  42 #include <vlc_input.h>
  43 #include <vlc_access.h>
  44 #include <vlc_dialog.h>
  45 #include <vlc_fs.h>
  46
  47 #include "libmtp.h"
  48
  49 /*****************************************************************************
  50  * Module descriptor
  51  *****************************************************************************/
  52
  53 static int  Open ( vlc_object_t * );
  54 static void Close( vlc_object_t * );
  55
  56 vlc_module_begin()
  57     set_description( N_("MTP input") )
  58     set_shortname( N_("MTP") )
  59     set_category( CAT_INPUT )
  60     set_subcategory( SUBCAT_INPUT_ACCESS )
  61     set_capability( "access", 0 )
  62     add_shortcut( "mtp" )
  63     set_callbacks( Open, Close )
  64 vlc_module_end()
  65
  66 /*****************************************************************************
  67  * Exported prototypes
  68  *****************************************************************************/
  69
  70 static int  Seek( access_t *, uint64_t );
  71 static ssize_t Read( access_t *, uint8_t *, size_t );
  72 static int  Control( access_t *, int, va_list );
  73
  74 static int  open_file( access_t *, const char * );
  75
  76 struct access_sys_t
  77 {
  78     int fd;
  79 };
  80
  81 /*****************************************************************************
  82  * Open: open the file
  83  *****************************************************************************/
  84 static int Open( vlc_object_t *p_this )
  85 {
  86     access_t     *p_access = ( access_t* )p_this;
  87     access_sys_t *p_sys;
  88     uint32_t i_bus;
  89     uint8_t i_dev;
  90     uint16_t i_product_id;
  91     int i_track_id;
  92     LIBMTP_raw_device_t *p_rawdevices;
  93     LIBMTP_mtpdevice_t *p_device;
  94     int i_numrawdevices;
  95     int i_ret;
  96
  97     if( sscanf( p_access->psz_location, "%"SCNu32":%"SCNu8":%"SCNu16":%d",
  98                 &i_bus, &i_dev, &i_product_id, &i_track_id ) != 4 )
  99         return VLC_EGENERIC;
 100     i_ret = LIBMTP_Detect_Raw_Devices( &p_rawdevices, &i_numrawdevices );
 101     if( i_ret != 0 || i_numrawdevices <= 0 || !p_rawdevices )
 102         return VLC_EGENERIC;
 103
 104     for( int i = 0; i < i_numrawdevices; i++ )
 105     {
 106         if( i_bus == p_rawdevices[i].bus_location &&
 107             i_dev == p_rawdevices[i].devnum &&
 108             i_product_id == p_rawdevices[i].device_entry.product_id )
 109         {
 110             if( ( p_device = LIBMTP_Open_Raw_Device( &p_rawdevices[i] )
 111                 ) != NULL )
 112             {
 113                 free( p_access->psz_filepath );
 114 #warning Oooh no! Not tempnam()!
 115                 p_access->psz_filepath = tempnam( NULL, "vlc" );
 116                 if( p_access->psz_filepath == NULL )
 117                 {
 118                     LIBMTP_Release_Device( p_device );
 119                     free( p_rawdevices );
 120                     return VLC_ENOMEM;
 121                 }
 122                 else
 123                 {
 124                     msg_Dbg( p_access, "About to write %s",
 125                              p_access->psz_filepath );
 126                     LIBMTP_Get_File_To_File( p_device, i_track_id,
 127                                              p_access->psz_filepath, NULL,
 128                                              NULL );
 129                     LIBMTP_Release_Device( p_device );
 130                     i = i_numrawdevices;
 131                 }
 132             }
 133             else
 134             {
 135                 free( p_rawdevices );
 136                 return VLC_EGENERIC;
 137             }
 138         }
 139     }
 140     free( p_rawdevices );
 141
 142     STANDARD_READ_ACCESS_INIT;
 143     int fd = p_sys->fd = -1;
 144
 145     /* Open file */
 146     msg_Dbg( p_access, "opening file `%s'", p_access->psz_filepath );
 147     fd = open_file( p_access, p_access->psz_filepath );
 148
 149     if( fd == -1 )
 150     {
 151         free( p_sys );
 152         return VLC_EGENERIC;
 153     }
 154     p_sys->fd = fd;
 155
 156     return VLC_SUCCESS;
 157 }
 158
 159 /*****************************************************************************
 160  * Close: close the target
 161  *****************************************************************************/
 162 static void Close( vlc_object_t * p_this )
 163 {
 164     access_t     *p_access = ( access_t* )p_this;
 165     access_sys_t *p_sys = p_access->p_sys;
 166
 167     close ( p_sys->fd );
 168     if( vlc_unlink( p_access->psz_filepath ) != 0 )
 169         msg_Err( p_access, "Error deleting file %s, %s",
 170                  p_access->psz_filepath, vlc_strerror_c(errno) );
 171     free( p_sys );
 172 }
 173
 174 /*****************************************************************************
 175  * Read: standard read on a file descriptor.
 176  *****************************************************************************/
 177 static ssize_t Read( access_t *p_access, uint8_t *p_buffer, size_t i_len )
 178 {
 179     access_sys_t *p_sys = p_access->p_sys;
 180     ssize_t i_ret;
 181     int fd = p_sys->fd;
 182
 183     i_ret = read( fd, p_buffer, i_len );
 184
 185     if( i_ret < 0 )
 186     {
 187         switch( errno )
 188         {
 189             case EINTR:
 190             case EAGAIN:
 191                 break;
 192
 193             default:
 194                 msg_Err( p_access, "read failed: %s", vlc_strerror_c(errno) );
 195                 dialog_Fatal( p_access, _( "File reading failed" ),
 196                               _( "VLC could not read the file: %s" ),
 197                               vlc_strerror(errno) );
 198                 p_access->info.b_eof = true;
 199                 return 0;
 200         }
 201     }
 202     else if( i_ret > 0 )
 203         p_access->info.i_pos += i_ret;
 204     else
 205         p_access->info.b_eof = true;
 206
 207     return i_ret;
 208 }
 209
 210
 211 /*****************************************************************************
 212  * Seek: seek to a specific location in a file
 213  *****************************************************************************/
 214 static int Seek( access_t *p_access, uint64_t i_pos )
 215 {
 216     p_access->info.i_pos = i_pos;
 217     p_access->info.b_eof = false;
 218
 219     if (lseek( p_access->p_sys->fd, i_pos, SEEK_SET ) == (off_t)-1)
 220         return VLC_EGENERIC;
 221     return VLC_SUCCESS;
 222 }
 223
 224 /*****************************************************************************
 225  * Control:
 226  *****************************************************************************/
 227 static int Control( access_t *p_access, int i_query, va_list args )
 228 {
 229     access_sys_t *sys = p_access->p_sys;
 230     bool   *pb_bool;
 231     int64_t      *pi_64;
 232
 233     switch( i_query )
 234     {
 235         case ACCESS_CAN_SEEK:
 236         case ACCESS_CAN_FASTSEEK:
 237             pb_bool = ( bool* )va_arg( args, bool* );
 238             *pb_bool = true;
 239             break;
 240
 241         case ACCESS_CAN_PAUSE:
 242         case ACCESS_CAN_CONTROL_PACE:
 243             pb_bool = ( bool* )va_arg( args, bool* );
 244             *pb_bool = true;
 245             break;
 246
 247         case ACCESS_GET_SIZE:
 248         {
 249             uint64_t *s = va_arg( args, uint64_t * );
 250             struct stat st;
 251             if( fstat( sys->fd, &st ) )
 252             {
 253                 msg_Err( p_access, "fstat error: %s", vlc_strerror_c(errno) );
 254                 return VLC_EGENERIC;
 255             }
 256             *s = st.st_size;
 257             break;
 258         }
 259
 260         case ACCESS_GET_PTS_DELAY:
 261             pi_64 = ( int64_t* )va_arg( args, int64_t * );
 262             *pi_64 = INT64_C(1000)
 263                    * var_InheritInteger( p_access, "file-caching" );
 264             break;
 265
 266         case ACCESS_SET_PAUSE_STATE:
 267             /* Nothing to do */
 268             break;
 269
 270         default:
 271             return VLC_EGENERIC;
 272
 273     }
 274     return VLC_SUCCESS;
 275 }
 276
 277 /*****************************************************************************
 278  * open_file: Opens a specific file
 279  *****************************************************************************/
 280 static int open_file( access_t *p_access, const char *path )
 281 {
 282     int fd = vlc_open( path, O_RDONLY | O_NONBLOCK );
 283     if( fd == -1 )
 284     {
 285         msg_Err( p_access, "cannot open file %s: %s", path,
 286                  vlc_strerror_c(errno) );
 287         dialog_Fatal( p_access, _( "File reading failed" ),
 288                       _( "VLC could not open the file \"%s\": %s" ), path,
 289                       vlc_strerror(errno) );
 290         return -1;
 291     }
 292 #ifdef F_RDAHEAD
 293     fcntl( fd, F_RDAHEAD, 1 );
 294 #endif
 295 #ifdef F_NOCACHE
 296     fcntl( fd, F_NOCACHE, 0 );
 297 #endif
 298     return fd;
 299 }