vlc input control: add INPUT_GET_TITLE_INFO

as we'll need seekpoints for UI: chapters offsets were not sufficient.

include/vlc_input.h

@@ -494,6 +494,9 @@ enum input_query_e
     INPUT_DEL_BOOKMARK,    /* arg1= seekpoint_t *  res=can fail   */
     INPUT_SET_BOOKMARK,    /* arg1= int  res=can fail    */
 
+    /* titles */
+    INPUT_GET_TITLE_INFO,     /* arg1=input_title_t** arg2= int * res=can fail */
+
     /* Attachments */
     INPUT_GET_ATTACHMENTS, /* arg1=input_attachment_t***, arg2=int*  res=can fail */
     INPUT_GET_ATTACHMENT,  /* arg1=input_attachment_t**, arg2=char*  res=can fail */

src/input/control.c

@@ -325,6 +325,30 @@ int input_vaControl( input_thread_t *p_input, int i_query, va_list args )
             vlc_mutex_unlock( &p_input->p->p_item->lock );
             return VLC_SUCCESS;
 
+        case INPUT_GET_TITLE_INFO:
+        {
+            input_title_t **p_title = (input_title_t **)va_arg( args, input_title_t ** );
+            int *pi_req_title_offset = (int *) va_arg( args, int * );
+
+            vlc_mutex_lock( &p_input->p->p_item->lock );
+
+            /* current title if -1 */
+            if ( *pi_req_title_offset < 0 )
+                *pi_req_title_offset = p_input->p->i_title_offset;
+
+            if( p_input->p->i_title && p_input->p->i_title > *pi_req_title_offset )
+            {
+                *p_title = vlc_input_title_Duplicate( p_input->p->title[*pi_req_title_offset] );
+                vlc_mutex_unlock( &p_input->p->p_item->lock );
+                return VLC_SUCCESS;
+            }
+            else
+            {
+                vlc_mutex_unlock( &p_input->p->p_item->lock );
+                return VLC_EGENERIC;
+            }
+        }
+
         case INPUT_ADD_OPTION:
         {
             const char *psz_option = va_arg( args, const char * );

src/input/input.c

@@ -935,6 +935,7 @@ static void InitTitle( input_thread_t * p_input )
     if( p_input->b_preparsing )
         return;
 
+    vlc_mutex_lock( &p_input->p->p_item->lock );
     /* Create global title (from master) */
     p_input->p->i_title = p_master->i_title;
     p_input->p->title   = p_master->title;
@@ -951,6 +952,7 @@ static void InitTitle( input_thread_t * p_input )
     p_input->p->b_can_pace_control    = p_master->b_can_pace_control;
     p_input->p->b_can_pause        = p_master->b_can_pause;
     p_input->p->b_can_rate_control = p_master->b_can_rate_control;
+    vlc_mutex_unlock( &p_input->p->p_item->lock );
 }
 
 static void StartTitle( input_thread_t * p_input )