Struct ParameterFootprint 

pub struct ParameterFootprint { /* private fields */ }

The heap bytes an AVCodecParameters holds — measured, never allocated.

See [bounded_clone_parameters] for the rule this measurement serves and for the field-by-field inventory it is derived from.

Implementations

impl ParameterFootprint

pub const fn extradata(&self) -> usize

Bytes a copy of extradata allocates — the payload plus the AV_INPUT_BUFFER_PADDING_SIZE trailing zeroes decoders read past the end into.

The padding is counted because it is allocated: a ceiling that measured only the payload admitted a copy sixty-four bytes larger than it agreed to, once per stream. Zero when there is no extradata at all — no payload, no padding.

pub const fn extradata_payload(&self) -> usize

The extradata_size the parameters declare — the payload alone, with no padding.

Self::extradata is what a parameter clone costs, padding included. This is what a carrier costs: the synthesized attachment road copies these bytes into an FfmpegBytes, which allocates exactly them, so charging the padded figure against the attachment budget would bill sixty-four bytes nobody allocates — and reject a payload sitting in the last sixty-four bytes below the ceiling that the image road, judging the same bytes, accepts.

pub const fn coded_side_data(&self) -> usize

Bytes across every coded_side_data entry, plus the array of descriptors itself.

pub const fn channel_map(&self) -> usize

Bytes in a custom channel map, or zero for every other layout order.

pub const fn total(&self) -> Option<usize>

Everything a clone of these parameters would retain.

None on overflow — a set of declared sizes that cannot be added up is not a set anything should try to copy.

pub const fn total_without_extradata(&self) -> Option<usize>

The same total with extradata left out — what a clone retains when the caller is going to strip it.

The synthesized-attachment road does exactly that: a font’s extradata is its payload, the carrier already holds it, and counting it twice would make the budget describe the file rather than the memory.

Trait Implementations

impl Clone for ParameterFootprint

fn clone(&self) -> ParameterFootprint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ParameterFootprint

impl Debug for ParameterFootprint

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

Formats the value using the given formatter.

impl Default for ParameterFootprint

fn default() -> ParameterFootprint

Returns the “default value” for a type.

impl Eq for ParameterFootprint

impl PartialEq for ParameterFootprint

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ParameterFootprint