
/******************************************************************

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 FS                      (float)8000.0
#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


