Struct TargetQuality 

pub struct TargetQuality {
    pub metric: QualityMetric,
    pub value: f32,
}

A perceptual quality target used when binary-searching a lossy encode quality.

The search is a binary search over 1..=quality when a quality is given and 1..=100 otherwise, and it assumes the score rises with the quality setting. Encoders do not promise that: rate control changes quantization as the setting moves, and a perceptual score against the original can fall a little on the way up. So the quality returned is one whose score meets value rather than necessarily the least one that would, and where no probed quality meets it, the top of the range is returned together with a TransformWarning::TargetQualityNotReached naming the score that encode reached. Guaranteeing the minimum would mean scanning the range at an encode, a decode, and a metric per step, against the handful the search makes.

Fields

metric: QualityMetric

The requested quality metric.

value: f32

The threshold that the encoded output should meet or exceed.

Trait Implementations

impl Clone for TargetQuality

fn clone(&self) -> TargetQuality

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TargetQuality

impl Debug for TargetQuality

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

Formats the value using the given formatter.

impl Display for TargetQuality

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

Formats the value using the given formatter.

impl FromStr for TargetQuality

type Err = String

The associated error which can be returned from parsing.

fn from_str(value: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl PartialEq for TargetQuality

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for TargetQuality