spandsp 0.0.6
g726_state_s Struct Reference

#include <g726.h>

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
 
bitstream_state_t bs
 The bit stream processing context.
 
g726_encoder_func_t enc_func
 The current encoder function.
 
g726_decoder_func_t dec_func
 The current decoder function.
 

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 ITU Recommendation G.726. The field names are essentially indentical to variable names in the bit level description of the coding algorithm included in this recommendation.

Member Data Documentation

◆ a

int16_t g726_state_s::a[2]

Coefficients of pole portion of prediction filter.

◆ ap

int16_t g726_state_s::ap

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

◆ b

int16_t g726_state_s::b[6]

Coefficients of zero portion of prediction filter.

◆ bits_per_sample

int g726_state_s::bits_per_sample

The number of bits per sample

◆ dml

int16_t g726_state_s::dml

Long term energy estimate.

◆ dms

int16_t g726_state_s::dms

int16_t term energy estimate.

◆ dq

int16_t g726_state_s::dq[6]

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

◆ ext_coding

int g726_state_s::ext_coding

The external coding, for tandem operation

◆ packing

int g726_state_s::packing

One of the G.726_PACKING_xxx options

◆ pk

int16_t g726_state_s::pk[2]

Signs of previous two samples of a partially reconstructed signal.

◆ rate

int g726_state_s::rate

The bit rate

◆ sr

int16_t g726_state_s::sr[2]

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

◆ td

int g726_state_s::td

Delayed tone detect

◆ yl

int32_t g726_state_s::yl

Locked or steady state step size multiplier.

◆ yu

int16_t g726_state_s::yu

Unlocked or non-steady state step size multiplier.


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