Struct Av1Invariant 

pub struct Av1Invariant {

    pub seq_profile: u8,
    pub seq_level_idx_0: u8,
    pub seq_tier_0: u8,
    pub bit_depth: u8,
    pub monochrome: bool,
    pub chroma_subsampling_x: bool,
    pub chroma_subsampling_y: bool,
    pub color_primaries: u8,
    pub transfer_characteristics: u8,
    pub matrix_coefficients: u8,
    pub color_range: bool,
    pub max_frame_width_minus1: u32,
    pub max_frame_height_minus1: u32,
    pub still_picture: bool,
}

AV1 sequence-header invariant — every encoder contributing segments to a single rendition MUST agree on these fields.

Why these specific fields: each is part of the codec-init contract that the player sets up once from av1C and expects to hold for every segment. The decoder re-parses the inline OBU sequence header in each segment’s IDR; if its parsed values disagree with the av1C from init.mp4, strict decoders (dav1d in conformance mode, Safari AVFoundation, hls.js+libdav1d) reject the segment. Optional fields (timing info, decoder model, film grain present, operating points) are tolerated by every major player; we deliberately don’t check them so NVENC + QSV + AMF + rav1e co-exist on one rendition without cosmetic byte differences triggering false rejections.

Fields

seq_profile: u8

seq_level_idx_0: u8

seq_tier_0: u8

bit_depth: u8

monochrome: bool

chroma_subsampling_x: bool

chroma_subsampling_y: bool

color_primaries: u8

transfer_characteristics: u8

matrix_coefficients: u8

color_range: bool

max_frame_width_minus1: u32

max_frame_height_minus1: u32

still_picture: bool

Implementations

impl Av1Invariant

pub fn from_sequence_header(sh: &Av1SequenceHeader) -> Self

Trait Implementations

impl Clone for Av1Invariant

fn clone(&self) -> Av1Invariant

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Av1Invariant

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

Formats the value using the given formatter.

impl Eq for Av1Invariant

impl PartialEq for Av1Invariant

fn eq(&self, other: &Av1Invariant) -> 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 StructuralPartialEq for Av1Invariant