+ if( p_sys->i_output <= 0 )
+ {
+ p_sys->pp_input = pp_block;
+ vlc_cond_signal( &p_sys->wait_input );
+
+ while( p_sys->pp_input )
+ vlc_cond_wait( &p_sys->wait_output, &p_sys->lock );
+ }
+
+ p_ret = NULL;
+ if( p_sys->i_output > 0 )
+ {
+ p_ret = p_sys->pp_output[0];
+ TAB_REMOVE( p_sys->i_output, p_sys->pp_output, p_ret );
+ }