current_buffer
if (hdr_count > port->current_buffer.num)
port->current_buffer.num,
port->current_buffer.size, port->current_buffer.alignment);
p->buffer_num = port->current_buffer.num;
p->buffer_size = port->current_buffer.size;
port->current_buffer.num = rmsg->u.port_info_get_reply.port.buffer_num;
port->current_buffer.size =
struct vchiq_mmal_port_buffer current_buffer;