interval.c File Reference

Compute the interpretation interval for LSB and W-LSB encoding. More...

#include "interval.h"
#include <assert.h>

Include dependency graph for interval.c:

Functions
struct rohc_interval8	rohc_f_8bits (const uint8_t v_ref, const size_t k, const rohc_lsb_shift_t p)
	The f function as defined in LSB encoding for 8-bit fields.
struct rohc_interval16	rohc_f_16bits (const uint16_t v_ref, const size_t k, const rohc_lsb_shift_t p)
	The f function as defined in LSB encoding for 16-bit fields.
struct rohc_interval32	rohc_f_32bits (const uint32_t v_ref, const size_t k, const rohc_lsb_shift_t p)
	The f function as defined in LSB encoding for 32-bit fields.

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Detailed Description

Compute the interpretation interval for LSB and W-LSB encoding.

Author:

Didier Barvaux <didier.barvaux@toulouse.viveris.com>

Didier Barvaux <didier@barvaux.org>

David Moreau from TAS

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Function Documentation

struct rohc_interval16 rohc_f_16bits	(	const uint16_t	v_ref,
		const size_t	k,
		const rohc_lsb_shift_t	p
	)			[read]

The f function as defined in LSB encoding for 16-bit fields.

Find out the interval [v_ref - p, v_ref + (2^k - 1) - p] for a given k. See 4.5.1 in the RFC 3095 for details.

As stated RFC, the values to be encoded have a finite range and the interpretation interval can straddle the wraparound boundary. So, the min value may be greater than the max value!

Parameters:

	v_ref	The reference value
	k	The number of least significant bits of the value that are transmitted
	p	The shift parameter (may be negative)

Returns:

The computed interval

struct rohc_interval32 rohc_f_32bits	(	const uint32_t	v_ref,
		const size_t	k,
		const rohc_lsb_shift_t	p
	)			[read]

The f function as defined in LSB encoding for 32-bit fields.

Find out the interval [v_ref - p, v_ref + (2^k - 1) - p] for a given k. See 4.5.1 in the RFC 3095 for details.

As stated RFC, the values to be encoded have a finite range and the interpretation interval can straddle the wraparound boundary. So, the min value may be greater than the max value!

Parameters:

	v_ref	The reference value
	k	The number of least significant bits of the value that are transmitted
	p	The shift parameter (may be negative)

Returns:

The computed interval

struct rohc_interval8 rohc_f_8bits	(	const uint8_t	v_ref,
		const size_t	k,
		const rohc_lsb_shift_t	p
	)			[read]

The f function as defined in LSB encoding for 8-bit fields.

Find out the interval [v_ref - p, v_ref + (2^k - 1) - p] for a given k. See 4.5.1 in the RFC 3095 for details.

As stated RFC, the values to be encoded have a finite range and the interpretation interval can straddle the wraparound boundary. So, the min value may be greater than the max value!

Parameters:

	v_ref	The reference value
	k	The number of least significant bits of the value that are transmitted
	p	The shift parameter (may be negative)

Returns:

The computed interval