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
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( stream_t *, uint64_t );
71 static ssize_t Read( stream_t *, void *, size_t );
72 static int Control( stream_t *, int, va_list );
73
74 /*****************************************************************************
75 * Open: open the file
76 *****************************************************************************/
Open(vlc_object_t * p_this)77 static int Open( vlc_object_t *p_this )
78 {
79 stream_t *p_access = ( stream_t* )p_this;
80 uint32_t i_bus;
81 uint8_t i_dev;
82 uint16_t i_product_id;
83 int i_track_id;
84 LIBMTP_raw_device_t *p_rawdevices;
85 int i_numrawdevices;
86
87 if( sscanf( p_access->psz_location, "%"SCNu32":%"SCNu8":%"SCNu16":%d",
88 &i_bus, &i_dev, &i_product_id, &i_track_id ) != 4 )
89 return VLC_EGENERIC;
90
91 if( LIBMTP_Detect_Raw_Devices( &p_rawdevices, &i_numrawdevices ) )
92 return VLC_EGENERIC;
93
94 int fd = -1;
95
96 for( int i = 0; i < i_numrawdevices; i++ )
97 {
98 if( i_bus == p_rawdevices[i].bus_location &&
99 i_dev == p_rawdevices[i].devnum &&
100 i_product_id == p_rawdevices[i].device_entry.product_id )
101 {
102 LIBMTP_mtpdevice_t *p_device;
103
104 p_device = LIBMTP_Open_Raw_Device( &p_rawdevices[i] );
105 if( p_device == NULL )
106 break;
107
108 fd = vlc_memfd();
109 if( unlikely(fd == -1) )
110 break;
111
112 msg_Dbg( p_access, "copying to memory" );
113 LIBMTP_Get_File_To_File_Descriptor( p_device, i_track_id, fd,
114 NULL, NULL );
115 LIBMTP_Release_Device( p_device );
116 break;
117 }
118 }
119 free( p_rawdevices );
120
121 if( fd == -1 )
122 {
123 msg_Err( p_access, "cannot find %s", p_access->psz_location );
124 return VLC_EGENERIC;
125 }
126
127 if( lseek( fd, 0, SEEK_SET ) ) /* Reset file descriptor offset */
128 {
129 close( fd );
130 return VLC_EGENERIC;
131 }
132
133 p_access->p_sys = (void *)(intptr_t)fd;
134 ACCESS_SET_CALLBACKS( Read, NULL, Control, Seek );
135 return VLC_SUCCESS;
136 }
137
138 /*****************************************************************************
139 * Close: close the target
140 *****************************************************************************/
Close(vlc_object_t * p_this)141 static void Close( vlc_object_t * p_this )
142 {
143 stream_t *p_access = ( stream_t* )p_this;
144 int fd = (intptr_t)p_access->p_sys;
145
146 vlc_close ( fd );
147 }
148
149 /*****************************************************************************
150 * Read: standard read on a file descriptor.
151 *****************************************************************************/
Read(stream_t * p_access,void * p_buffer,size_t i_len)152 static ssize_t Read( stream_t *p_access, void *p_buffer, size_t i_len )
153 {
154 int fd = (intptr_t)p_access->p_sys;
155 ssize_t i_ret = read( fd, p_buffer, i_len );
156
157 if( i_ret < 0 )
158 {
159 switch( errno )
160 {
161 case EINTR:
162 case EAGAIN:
163 break;
164
165 default:
166 msg_Err( p_access, "read failed: %s", vlc_strerror_c(errno) );
167 vlc_dialog_display_error( p_access, _( "File reading failed" ),
168 _( "VLC could not read the file: %s" ),
169 vlc_strerror(errno) );
170 return 0;
171 }
172 }
173
174 return i_ret;
175 }
176
177
178 /*****************************************************************************
179 * Seek: seek to a specific location in a file
180 *****************************************************************************/
Seek(stream_t * p_access,uint64_t i_pos)181 static int Seek( stream_t *p_access, uint64_t i_pos )
182 {
183 int fd = (intptr_t)p_access->p_sys;
184
185 if (lseek( fd, i_pos, SEEK_SET ) == (off_t)-1)
186 return VLC_EGENERIC;
187 return VLC_SUCCESS;
188 }
189
190 /*****************************************************************************
191 * Control:
192 *****************************************************************************/
Control(stream_t * p_access,int i_query,va_list args)193 static int Control( stream_t *p_access, int i_query, va_list args )
194 {
195 int fd = (intptr_t)p_access->p_sys;
196 bool *pb_bool;
197 int64_t *pi_64;
198
199 switch( i_query )
200 {
201 case STREAM_CAN_SEEK:
202 case STREAM_CAN_FASTSEEK:
203 pb_bool = va_arg( args, bool * );
204 *pb_bool = true;
205 break;
206
207 case STREAM_CAN_PAUSE:
208 case STREAM_CAN_CONTROL_PACE:
209 pb_bool = va_arg( args, bool * );
210 *pb_bool = true;
211 break;
212
213 case STREAM_GET_SIZE:
214 {
215 uint64_t *s = va_arg( args, uint64_t * );
216 struct stat st;
217 if( fstat( fd, &st ) )
218 {
219 msg_Err( p_access, "fstat error: %s", vlc_strerror_c(errno) );
220 return VLC_EGENERIC;
221 }
222 *s = st.st_size;
223 break;
224 }
225
226 case STREAM_GET_PTS_DELAY:
227 pi_64 = va_arg( args, int64_t * );
228 *pi_64 = INT64_C(1000)
229 * var_InheritInteger( p_access, "file-caching" );
230 break;
231
232 case STREAM_SET_PAUSE_STATE:
233 /* Nothing to do */
234 break;
235
236 default:
237 return VLC_EGENERIC;
238
239 }
240 return VLC_SUCCESS;
241 }
242