Enum CapsTransform 

pub enum CapsTransform {
    RawVideo {
        accept: Vec<RawVideoFormat>,
        produce: Vec<RawVideoFormat>,
        shapes: Vec<RawVideoShape>,
    },
    Audio {
        accept: Vec<AudioFormat>,
        produce: Vec<AudioFormat>,
        shapes: Vec<AudioShape>,
    },
}

Declarative forward derivation for a transform element, read by the solver through CapsConstraint::DerivedFields.

shapes are the output alternatives in preference order (first preferred); duplicates are dropped, so a shape that coincides with the passthrough on a given input costs nothing. accept gates the input format (empty = every format of that media kind) and produce gates the derived output format (empty = unrestricted), which is what keeps an input-only format out of the derived set. An input the transform doesn’t accept, or no surviving shape, derives the empty set, which the solver reads as an unsatisfiable link.

Variants

RawVideo

Fields

accept: Vec<RawVideoFormat>

produce: Vec<RawVideoFormat>

shapes: Vec<RawVideoShape>

Audio

Fields

accept: Vec<AudioFormat>

produce: Vec<AudioFormat>

shapes: Vec<AudioShape>

Implementations

impl CapsTransform

pub fn derive(&self, input: &Caps) -> CapsSet

Forward derivation: the ordered output alternatives for input.

pub fn passthrough(&self) -> PassthroughFields

Which fields the solver may couple backward: those every output shape derives with FieldTransform::Identity. A field one alternative retargets is not coupled, whichever alternative the solve picks. No shapes means nothing derives, so nothing couples.

Trait Implementations

impl Clone for CapsTransform

fn clone(&self) -> CapsTransform

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CapsTransform

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

Formats the value using the given formatter.

impl PartialEq for CapsTransform

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CapsTransform