callback.c added (ops)

src/control/callback.c

+/*****************************************************************************
+ * libvlc_callback.c: New libvlc callback control API
+ *****************************************************************************
+ * Copyright (C) 2007 the VideoLAN team
+ * $Id $
+ *
+ * Authors: Filippo Carone <filippo@carone.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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#include "libvlc_internal.h"
+#include <vlc/libvlc.h>
+
+int libvlc_private_handle_callback( vlc_object_t *p_this, char const *psz_cmd,
+                                    vlc_value_t oldval, vlc_value_t newval,
+                                    void *p_data );
+
+void libvlc_callback_register_for_event( libvlc_instance_t *p_instance,
+                                        libvlc_event_type_t i_event_type,
+                                        libvlc_callback_t f_callback,
+                                        void *user_data,
+                                        libvlc_exception_t *p_e )
+{
+
+    if ( ! &f_callback )
+        RAISEVOID (" Callback function is null ");
+    
+    struct libvlc_callback_entry_t *entry = malloc( sizeof( struct libvlc_callback_entry_t ) );
+    entry->f_callback = f_callback;
+    entry->i_event_type = i_event_type;
+    entry->p_user_data = user_data;
+
+    const char *callback_name;
+    
+    switch ( i_event_type )
+    {
+        case VOLUME_CHANGED:
+            callback_name = "volume-change";
+            break;
+        case INPUT_POSITION_CHANGED:
+            break;
+        default:
+            free( entry );
+            RAISEVOID( "Unsupported event." );
+    }
+
+    int res = var_AddCallback( p_instance->p_libvlc_int,
+                               callback_name,
+                               libvlc_private_handle_callback,
+                               entry );
+    
+    if (res != VLC_SUCCESS)
+    {
+        free ( entry );
+        RAISEVOID("Internal callback registration was not successful. Callback not registered.");
+    }
+    
+    add_callback_entry( entry, &p_instance->p_callback_list );
+
+    return;
+}
+
+void libvlc_callback_unregister_for_event( libvlc_instance_t *p_instance,
+                                           libvlc_event_type_t i_event_type,
+                                           libvlc_callback_t f_callback,
+                                           void *p_user_data,
+                                           libvlc_exception_t *p_e )
+{
+    struct libvlc_callback_entry_list_t *p_listitem = p_instance->p_callback_list;
+
+    while( p_listitem )
+    {
+        if( p_listitem->elmt->f_callback == f_callback
+            && ( p_listitem->elmt->i_event_type == i_event_type )
+            && ( p_listitem->elmt->p_user_data == p_user_data )
+        
+        )
+        {
+            if( p_listitem->prev )
+                p_listitem->prev->next = p_listitem->next;
+            else
+                p_instance->p_callback_list = p_listitem->next;
+            
+            p_listitem->next->prev = p_listitem->prev;
+            free( p_listitem );
+            break;
+        }
+        p_listitem = p_listitem->next;
+    }
+}
+
+
+int libvlc_private_handle_callback( vlc_object_t *p_this, char const *psz_cmd,
+                                     vlc_value_t oldval, vlc_value_t newval,
+                                     void *p_data )
+{
+    struct libvlc_callback_entry_t *entry = p_data;
+    libvlc_event_t event;
+    event.type = entry->i_event_type;
+
+    /* Call the client entry */
+    entry->f_callback( entry->p_instance, &event, entry->p_user_data );
+
+    return VLC_SUCCESS;
+}