11ff2284f34137c2306cbb75614359aac08ef094
[vlc.git] / modules / services_discovery / hal.c
1 /*****************************************************************************
2  * hal.c :  HAL interface module
3  *****************************************************************************
4  * Copyright (C) 2004 the VideoLAN team
5  * Copyright © 2006-2007 Rafaël Carré
6  * $Id$
7  *
8  * Authors: Clément Stenac <zorglub@videolan.org>
9  *          Rafaël Carré <funman at videolanorg>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 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 General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24  *****************************************************************************/
25
26 #ifdef HAVE_CONFIG_H
27 # include "config.h"
28 #endif
29
30 #include <vlc_common.h>
31 #include <vlc_plugin.h>
32 #include <vlc_playlist.h>
33 #include <vlc_services_discovery.h>
34
35 #include <vlc_network.h>
36
37 #include <errno.h>                                                 /* ENOMEM */
38
39 #ifdef HAVE_UNISTD_H
40 #    include <unistd.h>
41 #endif
42 #ifdef HAVE_SYS_TIME_H
43 #    include <sys/time.h>
44 #endif
45
46 #include <hal/libhal.h>
47
48 #define MAX_LINE_LENGTH 256
49
50 /*****************************************************************************
51  * Local prototypes
52  *****************************************************************************/
53
54 /* store relation between item id and udi for ejection */
55 struct udi_input_id_t
56 {
57     char            *psz_udi;
58     input_item_t    *p_item;
59 };
60
61 struct services_discovery_sys_t
62 {
63     vlc_thread_t            thread;
64     LibHalContext           *p_ctx;
65     DBusConnection          *p_connection;
66     int                     i_devices_number;
67     struct udi_input_id_t   **pp_devices;
68 };
69 static void *Run ( void * );
70 static int  Open ( vlc_object_t * );
71 static void Close( vlc_object_t * );
72
73 /* HAL callbacks */
74 void DeviceAdded( LibHalContext *p_ctx, const char *psz_udi );
75 void DeviceRemoved( LibHalContext *p_ctx, const char *psz_udi );
76
77 /* to retrieve p_sd in HAL callbacks */
78 services_discovery_t        *p_sd_global;
79
80 /*****************************************************************************
81  * Module descriptor
82  *****************************************************************************/
83 vlc_module_begin ()
84     set_description( N_("HAL devices detection") )
85     set_category( CAT_PLAYLIST )
86     set_subcategory( SUBCAT_PLAYLIST_SD )
87
88     set_capability( "services_discovery", 0 )
89     set_callbacks( Open, Close )
90
91 vlc_module_end ()
92
93
94 /*****************************************************************************
95  * Open: initialize and create stuff
96  *****************************************************************************/
97 static int Open( vlc_object_t *p_this )
98 {
99     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
100     services_discovery_sys_t *p_sys  = malloc(
101                                     sizeof( services_discovery_sys_t ) );
102     if( !p_sys )
103         return VLC_ENOMEM;
104
105     DBusError           dbus_error;
106     DBusConnection      *p_connection;
107
108     p_sd_global = p_sd;
109     p_sys->i_devices_number = 0;
110     p_sys->pp_devices = NULL;
111
112     p_sd->p_sys  = p_sys;
113
114     dbus_error_init( &dbus_error );
115
116     p_sys->p_ctx = libhal_ctx_new();
117     if( !p_sys->p_ctx )
118     {
119         msg_Err( p_sd, "unable to create HAL context") ;
120         free( p_sys );
121         return VLC_EGENERIC;
122     }
123     p_connection = dbus_bus_get( DBUS_BUS_SYSTEM, &dbus_error );
124     if( dbus_error_is_set( &dbus_error ) )
125     {
126         msg_Err( p_sd, "unable to connect to DBUS: %s", dbus_error.message );
127         dbus_error_free( &dbus_error );
128         free( p_sys );
129         return VLC_EGENERIC;
130     }
131     libhal_ctx_set_dbus_connection( p_sys->p_ctx, p_connection );
132     p_sys->p_connection = p_connection;
133     if( !libhal_ctx_init( p_sys->p_ctx, &dbus_error ) )
134     {
135         msg_Err( p_sd, "hal not available : %s", dbus_error.message );
136         goto error;
137     }
138
139     if( !libhal_ctx_set_device_added( p_sys->p_ctx, DeviceAdded ) ||
140             !libhal_ctx_set_device_removed( p_sys->p_ctx, DeviceRemoved ) )
141     {
142         msg_Err( p_sd, "unable to add callback" );
143         goto error;
144     }
145
146     if( vlc_clone( &p_sys->thread, Run, p_this, VLC_THREAD_PRIORITY_LOW ) )
147         goto error;
148
149     return VLC_SUCCESS;
150 error:
151     dbus_error_free( &dbus_error );
152     free( p_sys );
153     return VLC_EGENERIC;
154 }
155
156 /*****************************************************************************
157  * Close:
158  *****************************************************************************/
159 static void Close( vlc_object_t *p_this )
160 {
161     services_discovery_t *p_sd = ( services_discovery_t* )p_this;
162     services_discovery_sys_t *p_sys  = p_sd->p_sys;
163
164     /*vlc_cancel( p_sys->thread );*/
165     vlc_object_kill( p_sd );
166     vlc_join( p_sys->thread, NULL );
167     dbus_connection_unref( p_sys->p_connection );
168     struct udi_input_id_t *p_udi_entry;
169
170     while( p_sys->i_devices_number > 0 )
171     {
172         p_udi_entry = p_sys->pp_devices[0];
173         free( p_udi_entry->psz_udi );
174         TAB_REMOVE( p_sys->i_devices_number, p_sys->pp_devices,
175                 p_sys->pp_devices[0] );
176         free( p_udi_entry );
177     }
178     p_sys->pp_devices = NULL;
179
180     free( p_sys );
181 }
182
183 static void AddItem( services_discovery_t *p_sd, input_item_t * p_input,
184                     const char* psz_device )
185 {
186     services_discovery_sys_t *p_sys  = p_sd->p_sys;
187     services_discovery_AddItem( p_sd, p_input, NULL /* no category */ );
188
189     struct udi_input_id_t *p_udi_entry;
190     p_udi_entry = malloc( sizeof( struct udi_input_id_t ) );
191     if( !p_udi_entry )
192         return;
193     p_udi_entry->psz_udi = strdup( psz_device );
194     if( !p_udi_entry->psz_udi )
195     {
196         free( p_udi_entry );
197         return;
198     }
199
200     vlc_gc_incref( p_input );
201     p_udi_entry->p_item = p_input;
202     TAB_APPEND( p_sys->i_devices_number, p_sys->pp_devices, p_udi_entry );
203 }
204
205 static void AddDvd( services_discovery_t *p_sd, const char *psz_device )
206 {
207     char *psz_name;
208     char *psz_uri;
209     char *psz_blockdevice;
210     input_item_t        *p_input;
211
212     psz_name = libhal_device_get_property_string( p_sd->p_sys->p_ctx,
213                                         psz_device, "volume.label", NULL );
214     psz_blockdevice = libhal_device_get_property_string( p_sd->p_sys->p_ctx,
215                                         psz_device, "block.device", NULL );
216
217     if( asprintf( &psz_uri, "dvd://%s", psz_blockdevice ) == -1 )
218         return;
219     /* Create the playlist item here */
220     p_input = input_item_New( p_sd, psz_uri, psz_name );
221     free( psz_uri );
222     if( !p_input )
223     {
224         return;
225     }
226
227     AddItem( p_sd, p_input, psz_device );
228
229     vlc_gc_decref( p_input );
230 }
231
232 static void DelItem( services_discovery_t *p_sd, const char* psz_udi )
233 {
234     services_discovery_sys_t    *p_sys  = p_sd->p_sys;
235
236     int i;
237     for( i = 0; i < p_sys->i_devices_number; i++ )
238     { /*  looks for a matching udi */
239         if( strcmp( psz_udi, p_sys->pp_devices[i]->psz_udi ) == 0 )
240         { /* delete the corresponding item */    
241             services_discovery_RemoveItem( p_sd, p_sys->pp_devices[i]->p_item );
242             vlc_gc_decref( p_sys->pp_devices[i]->p_item );
243             free( p_sys->pp_devices[i]->psz_udi );
244             TAB_REMOVE( p_sys->i_devices_number, p_sys->pp_devices,
245                     p_sys->pp_devices[i] );
246         }
247     }
248 }
249
250 static void AddCdda( services_discovery_t *p_sd, const char *psz_device )
251 {
252     char *psz_uri;
253     char *psz_blockdevice;
254     input_item_t     *p_input;
255
256     psz_blockdevice = libhal_device_get_property_string( p_sd->p_sys->p_ctx,
257                                             psz_device, "block.device", NULL );
258
259     if( asprintf( &psz_uri, "cdda://%s", psz_blockdevice ) == -1 )
260         return;
261     /* Create the item here */
262     p_input = input_item_New( p_sd, psz_uri, "Audio CD" );
263     free( psz_uri );
264     if( !p_input )
265         return;
266
267     AddItem( p_sd, p_input, psz_device );
268
269     vlc_gc_decref( p_input );
270 }
271
272 static void ParseDevice( services_discovery_t *p_sd, const char *psz_device )
273 {
274     char *psz_disc_type;
275     services_discovery_sys_t    *p_sys  = p_sd->p_sys;
276
277     if( !libhal_device_property_exists( p_sys->p_ctx, psz_device,
278                                        "volume.disc.type", NULL ) )
279         return;
280
281     psz_disc_type = libhal_device_get_property_string( p_sys->p_ctx,
282                                                     psz_device,
283                                                     "volume.disc.type",
284                                                     NULL );
285     if( !strncmp( psz_disc_type, "dvd_r", 5 ) )
286     {
287         if (libhal_device_get_property_bool( p_sys->p_ctx, psz_device,
288                                      "volume.disc.is_videodvd", NULL ) )
289         AddDvd( p_sd, psz_device );
290     }
291     else if( !strncmp( psz_disc_type, "cd_r", 4 ) )
292     {
293         if( libhal_device_get_property_bool( p_sys->p_ctx, psz_device,
294                                      "volume.disc.has_audio" , NULL ) )
295             AddCdda( p_sd, psz_device );
296     }
297 }
298
299 /*****************************************************************************
300  * Run: main HAL thread
301  *****************************************************************************/
302 static void *Run( void *data )
303 {
304     services_discovery_t     *p_sd  = data;
305     services_discovery_sys_t *p_sys = p_sd->p_sys;
306     char **devices;
307     int i, i_devices;
308     int canc = vlc_savecancel();
309
310     /* parse existing devices first */
311     if( ( devices = libhal_get_all_devices( p_sys->p_ctx, &i_devices, NULL ) ) )
312     {
313         for( i = 0; i < i_devices; i++ )
314         {
315             ParseDevice( p_sd, devices[ i ] );
316             libhal_free_string( devices[ i ] );
317         }
318         free( devices );
319     }
320
321     /* FIXME: Totally lame. There are DBus watch functions to do this properly.
322      * -- Courmisch, 28/08/2008 */
323     while( vlc_object_alive (p_sd) )
324     {
325         /* look for events on the bus, blocking 1 second */
326         dbus_connection_read_write_dispatch( p_sys->p_connection, 1000 );
327         /* HAL 0.5.8.1 can use libhal_ctx_get_dbus_connection(p_sys->p_ctx) */
328     }
329     vlc_restorecancel (canc);
330     return NULL;
331 }
332
333 void DeviceAdded( LibHalContext *p_ctx, const char *psz_udi )
334 {
335     VLC_UNUSED(p_ctx);
336     ParseDevice( p_sd_global, psz_udi );
337 }
338
339 void DeviceRemoved( LibHalContext *p_ctx, const char *psz_udi )
340 {
341     VLC_UNUSED(p_ctx);
342     DelItem( p_sd_global, psz_udi );
343 }