ccsds124_compressor Struct Reference

Compressor state structure. More...

#include <ccsds124.h>

Data Fields
Configuration (immutable after init)
size_t	F
bitvector_t	initial_mask
uint8_t	robustness
State (updated each cycle)
bitvector_t	mask
bitvector_t	prev_mask
bitvector_t	build
bitvector_t	prev_input
bitvector_t	change_history [CCSDS124_MAX_HISTORY]
size_t	history_index
History for cₜ calculation
uint8_t	new_mask_flag_history [CCSDS124_MAX_VT_HISTORY]
size_t	flag_history_index
Cycle counter
size_t	t
Parameter management (automatic mode)
int	pt_limit
int	ft_limit
int	rt_limit
int	pt_counter
int	ft_counter
int	rt_counter
Pre-allocated work buffers (avoid per-packet init)
bitvector_t	work_prev_build
bitvector_t	work_change
bitvector_t	work_Xt
bitvector_t	work_inverted
bitvector_t	work_shifted
bitvector_t	work_diff

Detailed Description

Compressor state structure.

Maintains all state needed for sequential packet compression. Must be initialized with ccsds124_compressor_init() before use.

Definition at line 537 of file ccsds124.h.

Field Documentation

build

bitvector_t ccsds124_compressor::build

Bₜ: Build vector

Definition at line 549 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), ccsds124_compressor_init(), and ccsds124_compressor_reset().

change_history

bitvector_t ccsds124_compressor::change_history[CCSDS124_MAX_HISTORY]

Dₜ₋ᵢ: Change vector history

Definition at line 551 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), ccsds124_compressor_init(), ccsds124_compressor_reset(), ccsds124_compute_effective_robustness(), and ccsds124_compute_robustness_window().

F

size_t ccsds124_compressor::F

Input vector length in bits

Definition at line 540 of file ccsds124.h.

Referenced by ccsds124_compress(), ccsds124_compress_packet(), ccsds124_compressor_init(), and ccsds124_compute_robustness_window().

flag_history_index

size_t ccsds124_compressor::flag_history_index

Index in flag history buffer

Definition at line 558 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), ccsds124_compressor_init(), and ccsds124_compute_ct_flag().

ft_counter

int ccsds124_compressor::ft_counter

Countdown to next ḟₜ=1

Definition at line 572 of file ccsds124.h.

Referenced by ccsds124_compress(), and ccsds124_compressor_reset().

ft_limit

int ccsds124_compressor::ft_limit

Send mask period (0 = manual)

Definition at line 569 of file ccsds124.h.

Referenced by ccsds124_compress(), ccsds124_compressor_init(), and ccsds124_compressor_reset().

history_index

size_t ccsds124_compressor::history_index

Current position in circular buffer

Definition at line 552 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), ccsds124_compressor_reset(), ccsds124_compute_effective_robustness(), and ccsds124_compute_robustness_window().

initial_mask

bitvector_t ccsds124_compressor::initial_mask

M₀: Initial mask vector

Definition at line 541 of file ccsds124.h.

Referenced by ccsds124_compressor_init(), and ccsds124_compressor_reset().

mask

bitvector_t ccsds124_compressor::mask

Mₜ: Current mask vector

Definition at line 547 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), ccsds124_compressor_init(), and ccsds124_compressor_reset().

new_mask_flag_history

uint8_t ccsds124_compressor::new_mask_flag_history[CCSDS124_MAX_VT_HISTORY]

ṗₜ history

Definition at line 557 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), ccsds124_compressor_init(), and ccsds124_compute_ct_flag().

prev_input

bitvector_t ccsds124_compressor::prev_input

Iₜ₋₁: Previous input packet

Definition at line 550 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), ccsds124_compressor_init(), and ccsds124_compressor_reset().

prev_mask

bitvector_t ccsds124_compressor::prev_mask

Mₜ₋₁: Previous mask vector

Definition at line 548 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), ccsds124_compressor_init(), and ccsds124_compressor_reset().

pt_counter

int ccsds124_compressor::pt_counter

Countdown to next ṗₜ=1

Definition at line 571 of file ccsds124.h.

Referenced by ccsds124_compress(), and ccsds124_compressor_reset().

pt_limit

int ccsds124_compressor::pt_limit

New mask period (0 = manual)

Definition at line 568 of file ccsds124.h.

Referenced by ccsds124_compress(), ccsds124_compressor_init(), and ccsds124_compressor_reset().

robustness

uint8_t ccsds124_compressor::robustness

Rₜ: Base robustness level (0-7)

Definition at line 542 of file ccsds124.h.

Referenced by ccsds124_compress(), ccsds124_compressor_init(), ccsds124_compute_effective_robustness(), ccsds124_compute_robustness_window(), and get_default_params().

rt_counter

int ccsds124_compressor::rt_counter

Countdown to next ṙₜ=1

Definition at line 573 of file ccsds124.h.

Referenced by ccsds124_compress(), and ccsds124_compressor_reset().

rt_limit

int ccsds124_compressor::rt_limit

Uncompressed period (0 = manual)

Definition at line 570 of file ccsds124.h.

Referenced by ccsds124_compress(), ccsds124_compressor_init(), and ccsds124_compressor_reset().

t

size_t ccsds124_compressor::t

Current time index

Definition at line 563 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), ccsds124_compressor_reset(), ccsds124_compute_ct_flag(), ccsds124_compute_effective_robustness(), and ccsds124_compute_robustness_window().

work_change

bitvector_t ccsds124_compressor::work_change

Temporary for change vector

Definition at line 579 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), and ccsds124_compressor_init().

work_diff

bitvector_t ccsds124_compressor::work_diff

Temporary for mask diff

Definition at line 583 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), and ccsds124_compressor_init().

work_inverted

bitvector_t ccsds124_compressor::work_inverted

Temporary for inverted mask

Definition at line 581 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), and ccsds124_compressor_init().

work_prev_build

bitvector_t ccsds124_compressor::work_prev_build

Temporary for prev_build

Definition at line 578 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), and ccsds124_compressor_init().

work_shifted

bitvector_t ccsds124_compressor::work_shifted

Temporary for shifted mask

Definition at line 582 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), and ccsds124_compressor_init().

work_Xt

bitvector_t ccsds124_compressor::work_Xt

Temporary for robustness window

Definition at line 580 of file ccsds124.h.

Referenced by ccsds124_compress_packet(), and ccsds124_compressor_init().

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The documentation for this struct was generated from the following file:

• ccsds124.h