rohc_decomp_get_context_info

NAME
SYNOPSIS
DESCRIPTION
PARAMETERS
STRUCTURES
RETURN VALUE
SEE ALSO

NAME

rohc_decomp_get_context_info − Get some information about the given decompression context.

SYNOPSIS

#include <rohc/rohc_decomp.h>

bool rohc_decomp_get_context_info(
const struct rohc_decomp *const decomp
,
const rohc_cid_t cid
,
rohc_decomp_context_info_t *const info

);

DESCRIPTION

Get some information about the given decompression context.

To use the function, call it with a pointer on a pre−allocated rohc_decomp_context_info_t structure with the version_major and version_minor fields set to one of the following supported versions:

• Major 0, minor 0

See rohc_decomp_context_info_t for details about fields that are supported in the above versions.

PARAMETERS

decomp

The ROHC decompressor to get information from

cid

The Context ID to get information for

info [input, output]

The structure where information will be stored

STRUCTURES

Some information about one decompression context
The structure is used by the rohc_decomp_get_context_info function to store some information about one decompression context.

Versioning works as follow:

• The version_major field defines the compatibility level. If the major number given by user does not match the one expected by the library, an error is returned.

• The version_minor field defines the extension level. If the minor number given by user does not match the one expected by the library, only the fields supported in that minor version will be filled by rohc_decomp_get_context_info.

Notes for developers:

• Increase the major version if a field is removed.

• Increase the major version if a field is added at the beginning or in the middle of the structure.

• Increase the minor version if a field is added at the very end of the structure.

• The version_major and version_minor fields must be located at the very beginning of the structure.

• The structure must be packed.

Supported versions:

• Major 0 / Minor 0 contains: version_major, version_minor, packets_nr, comp_bytes_nr, uncomp_bytes_nr, corrected_crc_failures, corrected_sn_wraparounds, and corrected_wrong_sn_updates.

struct rohc_decomp_context_info_t {
unsigned short version_major; /* The major version of this structure */
unsigned short version_minor; /* The minor version of this structure */
unsigned long packets_nr; /* The number of packets processed by the context */
unsigned long comp_bytes_nr; /* The number of compressed bytes received by the context */
unsigned long uncomp_bytes_nr; /* The number of uncompressed bytes produced by the context */
unsigned long corrected_crc_failures; /* The number of successful corrections upon CRC failure */
unsigned long corrected_sn_wraparounds; /* The number of successful corrections of SN wraparound upon CRC failure */
unsigned long corrected_wrong_sn_updates; /* The number of successful corrections of incorrect SN updates upon CRC failure */
};

RETURN VALUE

true in case of success, false otherwise

SEE ALSO

rohc_decomp.h(3), rohc_decomp_context_info_t(3)