Enum ReadSpeed 

pub enum ReadSpeed {
    Unchanged,
    Optimal,
    CustomMultiplier(u8),
}

A platform-independent read-speed request for an optical drive.

The requested speed is a preference, not a guarantee. Under MMC, a drive may select the requested rate or a higher supported rate; the OS and drive firmware may further adjust or reject the request.

A successful speed change may remain active for subsequent reads. This crate does not restore the previous setting, although the OS, firmware, or other software may change it later.

Variants

Unchanged

Do not issue a speed-change request.

This is the default in ReadOptions. The drive retains whatever speed was previously selected by the OS, firmware, or another application.

Optimal

Ask the platform and drive to select an automatic or optimal read speed.

On macOS and Windows, this uses the 0xFFFF drive-selected/maximum-speed sentinel associated with SET CD SPEED (0xBB). On Linux, CDROM_SELECT_SPEED is called with a speed of zero to request automatic selection.

CustomMultiplier(u8)

Request a multiple of the nominal CD-DA 1× rate.

One unit represents 176.4 kB/s, so CustomMultiplier(1) requests 1× and CustomMultiplier(10) requests 10×. macOS and Windows convert the multiplier to kB/s, while Linux passes it as a speed multiplier.

CustomMultiplier(0) is equivalent to Optimal.

Trait Implementations

impl Clone for ReadSpeed

fn clone(&self) -> ReadSpeed

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ReadSpeed

impl Debug for ReadSpeed

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.