Struct CarryOverExtractor

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pub struct CarryOverExtractor { /* private fields */ }

Expand description

Stateful UP extractor that carries partial user packets across BBFrame boundaries — a single UP can span multiple frames, especially in HEM where stride=187 bytes.

Use feed_nm / feed_hem per received frame; the returned Vec holds whichever 188-byte TS packets completed during that frame.

Implementations§

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impl CarryOverExtractor

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pub fn new() -> Self

Create a fresh extractor with no carried-over state.

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pub fn feed_hem( &mut self, bbheader_bytes: &[u8; 10], data_field: &[u8], npd: bool, ) -> Vec<[u8; 188]>

Feed a HEM BBFrame’s header + data field. Returns any TS packets that completed during this frame.

npd is the MATYPE-1 NPD flag for the frame — when true the stream would additionally carry DNP bytes between UPs. NPD reinsertion is NOT YET implemented here; callers must not pass npd=true until the DNP path lands.

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pub fn feed_hem_into( &mut self, bbheader_bytes: &[u8; 10], data_field: &[u8], npd: bool, out: &mut Vec<[u8; 188]>, )

Buffer-reusing variant of feed_hem. Clears out, then appends the TS packets that completed during this frame. Reuse the same Vec across frames to avoid a per-frame heap allocation.

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pub fn feed_nm( &mut self, bbheader_bytes: &[u8; 10], data_field: &[u8], ) -> Vec<[u8; 188]>

Feed an NM BBFrame. Stride=188, byte[0] of each UP is the CRC-8 of the previous UP and gets replaced with 0x47.

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pub fn feed_nm_into( &mut self, bbheader_bytes: &[u8; 10], data_field: &[u8], out: &mut Vec<[u8; 188]>, )

Buffer-reusing variant of feed_nm. Clears out, then appends the TS packets that completed during this frame. Reuse the same Vec across frames to avoid a per-frame heap allocation.