Struct DbScale

pub struct DbScale {
    pub min: i32,
    pub step: u16,
    pub mute_avail: bool,
}

The data to express dB scale in TLV (Type-Length-Value) of ALSA control interface.

It has SNDRV_CTL_TLVT_DB_SCALE (=1) in its type field and has two elements in value field.

Fields

min: i32

The minimum value by dB expression, in 0.1 dB unit. This corresponds to the minimum value in the state of control element.

step: u16

The step by dB expression, in 0.1 dB unit. This corresponds to one increase of the value in the state of control element.

mute_avail: bool

If true, the value less than or equals to CTL_VALUE_MUTE (=-9999999) is available to mute the control element explicitly.

Trait Implementations

impl Clone for DbScale

fn clone(&self) -> DbScale

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for DbScale

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

Formats the value using the given formatter.

impl Default for DbScale

fn default() -> DbScale

Returns the “default value” for a type.

impl From<&DbScale> for Vec<u32>

fn from(data: &DbScale) -> Self

Converts to this type from the input type.

impl From<DbScale> for Vec<u32>

fn from(data: DbScale) -> Self

Converts to this type from the input type.

impl PartialEq for DbScale

fn eq(&self, other: &DbScale) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> TlvData<'a> for DbScale

fn value_type(&self) -> u32

Return the value of type field. It should come from UAPI of Linux kernel.

fn value_length(&self) -> usize

Return the length of value field. It should be in byte unit and multiples of 4 as result.

fn value(&self) -> Vec<u32>

Generate vector with u32 element for raw data.

impl ToDbInterval for DbScale

fn to_dbinterval( &self, range: &ValueRange, ) -> Result<DbInterval, ToDbIntervalError>

impl ToValueRange for DbScale

fn to_valuerange(&self, range: &ValueRange) -> Option<ValueRange>

impl TryFrom<&[u32]> for DbScale

type Error = TlvDecodeError

The type returned in the event of a conversion error.

fn try_from(raw: &[u32]) -> Result<Self, Self::Error>

Performs the conversion.

impl Copy for DbScale

impl Eq for DbScale

impl StructuralPartialEq for DbScale