Struct CompactSampleToGroup 

pub struct CompactSampleToGroup {
    pub grouping_type: [u8; 4],
    pub grouping_type_parameter: Option<u32>,
    pub index_msb_indicates_fragment_local_description: bool,
    pub patterns: Vec<CompactSampleToGroupPattern>,
}

One csgp (CompactSampleToGroupBox, ISO/IEC 14496-12:2020 §8.9.5) to emit on a track — the compact alternative to SampleToGroup.

Where sbgp emits one (sample_count, group_description_index) pair per run, csgp groups samples into a small set of patterns that are each replicated across the track: pattern i replays its indices for sample_count[i] consecutive groups. A track whose per-sample group membership is periodic (the common reason to pick the compact form) shrinks dramatically — the index run is bit-packed at the narrowest width that fits.

Pairs with an sgpd of the same grouping_type exactly like sbgp.

Fields

grouping_type: [u8; 4]

Four-byte grouping type matching the paired sgpd.

grouping_type_parameter: Option<u32>

grouping_type_parameter — selects an alternative grouping of the same type. Some(_) sets the flag-layout presence bit and emits the optional u32 field; None omits it.

index_msb_indicates_fragment_local_description: bool

index_msb_indicates_fragment_local_description — flag-layout bit 7 (§8.9.5). Set it (only legal when emitting into a traf) to declare that the most-significant bit of each index is a fragment-local-vs-global sgpd source selector. The builder writes each index value verbatim; it does not synthesise the selector bit, so a caller that sets this must pre-set the high bit on indices that should reference the fragment-local sgpd. Defaults to false (stbl form / no MSB special-casing).

patterns: Vec<CompactSampleToGroupPattern>

The repeating index patterns, in emit order.

Trait Implementations

impl Clone for CompactSampleToGroup

fn clone(&self) -> CompactSampleToGroup

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CompactSampleToGroup

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

Formats the value using the given formatter.

impl Default for CompactSampleToGroup

fn default() -> CompactSampleToGroup

Returns the “default value” for a type.