Struct alsa_ctl_tlv_codec::DbInterval

pub struct DbInterval {
    pub min: i32,
    pub max: i32,
    pub linear: bool,
    pub mute_avail: bool,
}

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

It has three variants below;

• SNDRV_CTL_TLVT_DB_LINEAR(=2)
• SNDRV_CTL_TLVT_DB_MINMAX(=4)
• SNDRV_CTL_TLVT_DB_MINMAX_MUTE(=5)

All of them have 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.

max: i32

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

linear: bool

If true, the value in the state of control element increases linearly, thus need calculation to convert to the value by dB expression. The calculation shall be:

20 * log10( current_value / ( maximum_value - minimum_value ) ) (* 100 in 0.1dB unit)

Else, the value in the state of control element corresponds to dB expression itself.

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 DbInterval

fn clone(&self) -> DbInterval

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for DbInterval

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

Formats the value using the given formatter.

impl Default for DbInterval

fn default() -> DbInterval

Returns the “default value” for a type.

impl From<&DbInterval> for Vec<u32>

fn from(data: &DbInterval) -> Self

Converts to this type from the input type.

impl From<DbInterval> for Vec<u32>

fn from(data: DbInterval) -> Self

Converts to this type from the input type.

impl PartialEq<DbInterval> for DbInterval

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl RangeUtil<i32> for DbInterval

fn length(&self) -> i32

The length from the minimum to maximum.

fn contains(&self, db: i32) -> bool

Whether the val is between the minimum and maximum.

impl<'a> TlvData<'a> for DbInterval

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 DbInterval

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

impl ToValueRange for DbInterval

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

impl TryFrom<&[u32]> for DbInterval

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 DbInterval

impl Eq for DbInterval

impl StructuralEq for DbInterval

impl StructuralPartialEq for DbInterval