asterisk/codecs/ilbc/iLBC_define.h

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2023-05-25 18:45:57 +00:00
/******************************************************************
iLBC Speech Coder ANSI-C Source Code
iLBC_define.h
Copyright (C) The Internet Society (2004).
All Rights Reserved.
******************************************************************/
#include <string.h>
#ifndef __iLBC_ILBCDEFINE_H
#define __iLBC_ILBCDEFINE_H
/* general codec settings */
#define BLOCKL_20MS 160
#define BLOCKL_30MS 240
#define BLOCKL_MAX 240
#define NSUB_20MS 4
#define NSUB_30MS 6
#define NSUB_MAX 6
#define NASUB_20MS 2
#define NASUB_30MS 4
#define NASUB_MAX 4
#define SUBL 40
#define STATE_LEN 80
#define STATE_SHORT_LEN_30MS 58
#define STATE_SHORT_LEN_20MS 57
/* LPC settings */
#define LPC_FILTERORDER 10
#define LPC_CHIRP_SYNTDENUM (float)0.9025
#define LPC_CHIRP_WEIGHTDENUM (float)0.4222
#define LPC_LOOKBACK 60
#define LPC_N_20MS 1
#define LPC_N_30MS 2
#define LPC_N_MAX 2
#define LPC_ASYMDIFF 20
#define LPC_BW (float)60.0
#define LPC_WN (float)1.0001
#define LSF_NSPLIT 3
#define LSF_NUMBER_OF_STEPS 4
#define LPC_HALFORDER (LPC_FILTERORDER/2)
/* cb settings */
#define CB_NSTAGES 3
#define CB_EXPAND 2
#define CB_MEML 147
#define CB_FILTERLEN 2*4
#define CB_HALFFILTERLEN 4
#define CB_RESRANGE 34
#define CB_MAXGAIN (float)1.3
/* enhancer */
#define ENH_BLOCKL 80 /* block length */
#define ENH_BLOCKL_HALF (ENH_BLOCKL/2)
#define ENH_HL 3 /* 2*ENH_HL+1 is number blocks
in said second sequence */
#define ENH_SLOP 2 /* max difference estimated and
correct pitch period */
#define ENH_PLOCSL 20 /* pitch-estimates and pitch-
locations buffer length */
#define ENH_OVERHANG 2
#define ENH_UPS0 4 /* upsampling rate */
#define ENH_FL0 3 /* 2*FLO+1 is the length of
each filter */
#define ENH_VECTL (ENH_BLOCKL+2*ENH_FL0)
#define ENH_CORRDIM (2*ENH_SLOP+1)
#define ENH_NBLOCKS (BLOCKL_MAX/ENH_BLOCKL)
#define ENH_NBLOCKS_EXTRA 5
#define ENH_NBLOCKS_TOT 8 /* ENH_NBLOCKS +
ENH_NBLOCKS_EXTRA */
#define ENH_BUFL (ENH_NBLOCKS_TOT)*ENH_BLOCKL
#define ENH_ALPHA0 (float)0.05
/* Down sampling */
#define FILTERORDER_DS 7
#define DELAY_DS 3
#define FACTOR_DS 2
/* bit stream defs */
#define NO_OF_BYTES_20MS 38
#define NO_OF_BYTES_30MS 50
#define NO_OF_WORDS_20MS 19
#define NO_OF_WORDS_30MS 25
#define STATE_BITS 3
#define BYTE_LEN 8
#define ULP_CLASSES 3
/* help parameters */
#define FLOAT_MAX (float)1.0e37
#define EPS (float)2.220446049250313e-016
#define PI (float)3.14159265358979323846
#define MIN_SAMPLE -32768
#define MAX_SAMPLE 32767
#define TWO_PI (float)6.283185307
#define PI2 (float)0.159154943
/* type definition encoder instance */
typedef struct iLBC_ULP_Inst_t_ {
int lsf_bits[6][ULP_CLASSES+2];
int start_bits[ULP_CLASSES+2];
int startfirst_bits[ULP_CLASSES+2];
int scale_bits[ULP_CLASSES+2];
int state_bits[ULP_CLASSES+2];
int extra_cb_index[CB_NSTAGES][ULP_CLASSES+2];
int extra_cb_gain[CB_NSTAGES][ULP_CLASSES+2];
int cb_index[NSUB_MAX][CB_NSTAGES][ULP_CLASSES+2];
int cb_gain[NSUB_MAX][CB_NSTAGES][ULP_CLASSES+2];
} iLBC_ULP_Inst_t;
/* type definition encoder instance */
typedef struct iLBC_Enc_Inst_t_ {
/* flag for frame size mode */
int mode;
/* basic parameters for different frame sizes */
int blockl;
int nsub;
int nasub;
int no_of_bytes, no_of_words;
int lpc_n;
int state_short_len;
const iLBC_ULP_Inst_t *ULP_inst;
/* analysis filter state */
float anaMem[LPC_FILTERORDER];
/* old lsf parameters for interpolation */
float lsfold[LPC_FILTERORDER];
float lsfdeqold[LPC_FILTERORDER];
/* signal buffer for LP analysis */
float lpc_buffer[LPC_LOOKBACK + BLOCKL_MAX];
/* state of input HP filter */
float hpimem[4];
} iLBC_Enc_Inst_t;
/* type definition decoder instance */
typedef struct iLBC_Dec_Inst_t_ {
/* flag for frame size mode */
int mode;
/* basic parameters for different frame sizes */
int blockl;
int nsub;
int nasub;
int no_of_bytes, no_of_words;
int lpc_n;
int state_short_len;
const iLBC_ULP_Inst_t *ULP_inst;
/* synthesis filter state */
float syntMem[LPC_FILTERORDER];
/* old LSF for interpolation */
float lsfdeqold[LPC_FILTERORDER];
/* pitch lag estimated in enhancer and used in PLC */
int last_lag;
/* PLC state information */
int prevLag, consPLICount, prevPLI, prev_enh_pl;
float prevLpc[LPC_FILTERORDER+1];
float prevResidual[NSUB_MAX*SUBL];
float per;
unsigned long seed;
/* previous synthesis filter parameters */
float old_syntdenum[(LPC_FILTERORDER + 1)*NSUB_MAX];
/* state of output HP filter */
float hpomem[4];
/* enhancer state information */
int use_enhancer;
float enh_buf[ENH_BUFL];
float enh_period[ENH_NBLOCKS_TOT];
} iLBC_Dec_Inst_t;
#endif