iLBC_define.h

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

 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