g726_state_s Struct Reference

#include <g726.h>

List of all members.

Public Attributes
int	rate
int	ext_coding
int	bits_per_sample
int	packing
int32_t	yl
int16_t	yu
int16_t	dms
int16_t	dml
int16_t	ap
int16_t	a [2]
int16_t	b [6]
int16_t	pk [2]
int16_t	dq [6]
int16_t	sr [2]
int	td
unsigned int	in_buffer
int	in_bits
unsigned int	out_buffer
int	out_bits
g726_encoder_func_t	enc_func
	The current encoder function.
g726_decoder_func_t	dec_func
	The current decoder function.
unsigned int	bits_per_sample
bitstream_state_t	bs
	The bit stream processing context.

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Detailed Description

The following is the definition of the state structure used by the G.726 encoder and decoder to preserve their internal state between successive calls. The meanings of the majority of the state structure fields are explained in detail in the CCITT Recommendation G.721. The field names are essentially indentical to variable names in the bit level description of the coding algorithm included in this Recommendation.

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Member Data Documentation

int g726_state_s::rate

The bit rate

Referenced by g726_init().

int g726_state_s::ext_coding

The external coding, for tandem operation

Referenced by g726_decode(), g726_encode(), and g726_init().

int g726_state_s::bits_per_sample

The number of bits per sample

Referenced by g726_decode(), g726_encode(), and g726_init().

int g726_state_s::packing

One fo the G.726_PACKING_xxx options

One of the G.726_PACKING_xxx options

Referenced by g726_decode(), g726_encode(), and g726_init().

int32_t g726_state_s::yl

Locked or steady state step size multiplier.

Referenced by g726_init().

int16_t g726_state_s::yu

Unlocked or non-steady state step size multiplier.

Referenced by g726_init().

int16_t g726_state_s::dms

int16_t term energy estimate.

Referenced by g726_init().

int16_t g726_state_s::dml

Long term energy estimate.

Referenced by g726_init().

int16_t g726_state_s::ap

Linear weighting coefficient of 'yl' and 'yu'.

Referenced by g726_init().

int16_t g726_state_s::a

Coefficients of pole portion of prediction filter.

Referenced by g726_init().

int16_t g726_state_s::b

Coefficients of zero portion of prediction filter.

Referenced by g726_init().

int16_t g726_state_s::pk

Signs of previous two samples of a partially reconstructed signal.

Referenced by g726_init().

int16_t g726_state_s::dq

Previous 6 samples of the quantized difference signal represented in an internal floating point format.

Referenced by g726_init().

int16_t g726_state_s::sr

Previous 2 samples of the quantized difference signal represented in an internal floating point format.

Referenced by g726_init().

int g726_state_s::td

Delayed tone detect

Referenced by g726_init().

unsigned int g726_state_s::bits_per_sample

The number of bits per sample

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

• non-gpl-bits/g726.h
• src/spandsp/g726.h