hal.c: start of a libhal based service discovry module. Detects dvd and

audio cd right now. todo: add more devices, use callbacks for device
insertions/removal

modules/misc/hal.c

+/*****************************************************************************
+ * sap.c :  SAP interface module
+ *****************************************************************************
+ * Copyright (C) 2004 VideoLAN
+ * $Id: sap.c 9217 2004-11-07 11:02:59Z courmisch $
+ *
+ * Authors: Clment Stenac <zorglub@videolan.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Includes
+ *****************************************************************************/
+#include <stdlib.h>                                      /* malloc(), free() */
+
+#include <vlc/vlc.h>
+#include <vlc/intf.h>
+
+#include <vlc/input.h>
+
+#include "network.h"
+
+#include <errno.h>                                                 /* ENOMEM */
+
+#ifdef HAVE_UNISTD_H
+#    include <unistd.h>
+#endif
+#ifdef HAVE_SYS_TIME_H
+#    include <sys/time.h>
+#endif
+
+#include <hal/libhal.h>
+
+/************************************************************************
+ * Macros and definitions
+ ************************************************************************/
+
+#define MAX_LINE_LENGTH 256
+
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+
+/* Callbacks */
+    static int  Open ( vlc_object_t * );
+    static void Close( vlc_object_t * );
+
+vlc_module_begin();
+    set_description( _("HAL device detection") );
+
+    set_capability( "interface", 0 );
+    set_callbacks( Open, Close );
+
+vlc_module_end();
+
+
+/*****************************************************************************
+ * Local structures
+ *****************************************************************************/
+
+struct intf_sys_t
+{
+    LibHalContext *p_ctx;
+    
+    /* playlist node */
+    playlist_item_t *p_node;
+
+};
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+
+/* Main functions */
+    static void Run    ( intf_thread_t *p_intf );
+
+/*****************************************************************************
+ * Open: initialize and create stuff
+ *****************************************************************************/
+static int Open( vlc_object_t *p_this )
+{
+    intf_thread_t *p_intf = ( intf_thread_t* )p_this;
+    intf_sys_t    *p_sys  = malloc( sizeof( intf_sys_t ) );
+
+    playlist_t          *p_playlist;
+    playlist_view_t     *p_view;
+
+    p_intf->pf_run = Run;
+    p_intf->p_sys  = p_sys;
+
+    if( !( p_sys->p_ctx = hal_initialize( NULL, FALSE ) ) )
+    {
+        free( p_sys );
+        msg_Err( p_intf, "hal not available" );
+        return VLC_EGENERIC;
+    }
+
+    /* Create our playlist node */
+    p_playlist = (playlist_t *)vlc_object_find( p_intf, VLC_OBJECT_PLAYLIST,
+                                                FIND_ANYWHERE );
+    if( !p_playlist )
+    {
+        msg_Warn( p_intf, "unable to find playlist, cancelling HAL listening");
+        return VLC_EGENERIC;
+    }
+
+    p_view = playlist_ViewFind( p_playlist, VIEW_CATEGORY );
+    p_sys->p_node = playlist_NodeCreate( p_playlist, VIEW_CATEGORY,
+                                         _("Devices"), p_view->p_root );
+
+    vlc_object_release( p_playlist );
+
+    return VLC_SUCCESS;
+}
+
+/*****************************************************************************
+ * Close:
+ *****************************************************************************/
+static void Close( vlc_object_t *p_this )
+{
+    intf_thread_t *p_intf = ( intf_thread_t* )p_this;
+    intf_sys_t    *p_sys  = p_intf->p_sys;
+
+    free( p_sys );
+}
+
+static void AddDvd( intf_thread_t *p_intf, char *psz_device )
+{
+    char *psz_name;
+    char *psz_uri;
+    char *psz_blockdevice;
+    intf_sys_t    *p_sys  = p_intf->p_sys;
+    playlist_t          *p_playlist;
+    playlist_item_t     *p_item;
+    psz_name = hal_device_get_property_string( p_intf->p_sys->p_ctx,
+                                               psz_device, "volume.label" );
+    psz_blockdevice = hal_device_get_property_string( p_intf->p_sys->p_ctx,
+                                                 psz_device, "block.device" );
+    asprintf( &psz_uri, "dvd://%s", psz_blockdevice );
+    /* Create the playlist item here */
+    p_item = playlist_ItemNew( p_intf, psz_uri,
+                               psz_name );
+    free( psz_uri );
+    hal_free_string( psz_device );
+    if( !p_item )
+    {
+        return;
+    }
+    p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
+    p_playlist = (playlist_t *)vlc_object_find( p_intf, VLC_OBJECT_PLAYLIST,
+                                                FIND_ANYWHERE );
+    if( !p_playlist )
+    {
+        msg_Err( p_intf, "playlist not found" );
+        return;
+    }
+
+    playlist_NodeAddItem( p_playlist, p_item, VIEW_CATEGORY, p_sys->p_node,
+                          PLAYLIST_APPEND, PLAYLIST_END );
+
+    vlc_object_release( p_playlist );
+
+    
+}
+static void AddCdda( intf_thread_t *p_intf, char *psz_device )
+{
+    char *psz_name = "Audio CD";
+    char *psz_uri;
+    char *psz_blockdevice;
+    intf_sys_t    *p_sys  = p_intf->p_sys;
+    playlist_t          *p_playlist;
+    playlist_item_t     *p_item;
+    psz_blockdevice = hal_device_get_property_string( p_intf->p_sys->p_ctx,
+                                                 psz_device, "block.device" );
+    asprintf( &psz_uri, "cdda://%s", psz_blockdevice );
+    /* Create the playlist item here */
+    p_item = playlist_ItemNew( p_intf, psz_uri,
+                               psz_name );
+    free( psz_uri );
+    hal_free_string( psz_device );
+    if( !p_item )
+    {
+        return;
+    }
+    p_item->i_flags &= ~PLAYLIST_SKIP_FLAG;
+    p_playlist = (playlist_t *)vlc_object_find( p_intf, VLC_OBJECT_PLAYLIST,
+                                                FIND_ANYWHERE );
+    if( !p_playlist )
+    {
+        msg_Err( p_intf, "playlist not found" );
+        return;
+    }
+
+    playlist_NodeAddItem( p_playlist, p_item, VIEW_CATEGORY, p_sys->p_node,
+                          PLAYLIST_APPEND, PLAYLIST_END );
+
+    vlc_object_release( p_playlist );
+
+    
+}
+
+static void ParseDevice( intf_thread_t *p_intf, char *psz_device )
+{
+    char *psz_disc_type;
+    intf_sys_t    *p_sys  = p_intf->p_sys;
+    if( hal_device_property_exists( p_sys->p_ctx, psz_device,
+                                    "volume.disc.type" ) )
+    {
+        psz_disc_type = hal_device_get_property_string( p_sys->p_ctx,
+                                                        psz_device,
+                                                        "volume.disc.type" );
+        if( !strcmp( psz_disc_type, "dvd_rom" ) )
+        {
+            AddDvd( p_intf, psz_device );
+        }
+        else if( !strcmp( psz_disc_type, "cd_rom" ) )
+        {
+            if( hal_device_get_property_bool( p_sys->p_ctx, psz_device, "volume.disc.has_audio" ) )
+            {
+                AddCdda( p_intf, psz_device );
+            }
+        }
+        hal_free_string( psz_disc_type );
+    }
+    
+}
+
+/*****************************************************************************
+ * Run: main HAL thread
+ *****************************************************************************/
+static void Run( intf_thread_t *p_intf )
+{
+    int i, i_devices;
+    char **devices;
+    intf_sys_t    *p_sys  = p_intf->p_sys;
+
+    /* parse existing devices first */
+    if( ( devices = hal_get_all_devices( p_sys->p_ctx, &i_devices ) ) )
+    {
+        for( i = 0; i < i_devices; i++ )
+        {
+            ParseDevice( p_intf, devices[ i ] );
+        }
+    }
+
+    while( !p_intf->b_die )
+    {
+        msleep( 1000 );
+    }
+}