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private.h

/*
 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
 * Universitaet Berlin.  See the accompanying file "COPYRIGHT" for
 * details.  THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
 */

/*$Header: /tmp_amd/presto/export/kbs/jutta/src/gsm/RCS/private.h,v 1.6 1996/07/02 10:15:26 jutta Exp $*/

#ifndef     PRIVATE_H
#define     PRIVATE_H

typedef short                 word;       /* 16 bit signed int    */
typedef long                  longword;   /* 32 bit signed int    */

typedef unsigned short        uword;            /* unsigned word  */
typedef unsigned long         ulongword;  /* unsigned longword    */

struct gsm_state {

      word        dp0[ 280 ];

      word        z1;         /* preprocessing.c, Offset_com. */
      longword    L_z2;       /*                  Offset_com. */
      int         mp;         /*                  Preemphasis     */

      word        u[8];       /* short_term_aly_filter.c    */
      word        LARpp[2][8];      /*                              */
      word        j;          /*                              */

      word            ltp_cut;        /* long_term.c, LTP crosscorr.  */
      word        nrp; /* 40 */     /* long_term.c, synthesis     */
      word        v[9];       /* short_term.c, synthesis    */
      word        msr;        /* decoder.c,     Postprocessing    */

      char        verbose;    /* only used if !NDEBUG       */
      char        fast;       /* only used if FAST          */

      char        wav_fmt;    /* only used if WAV49 defined */
      unsigned char     frame_index;      /*            odd/even chaining     */
      unsigned char     frame_chain;      /*   half-byte to carry forward     */
};


#define     MIN_WORD    (-32767 - 1)
#define     MAX_WORD      32767

#define     MIN_LONGWORD      (-2147483647 - 1)
#define     MAX_LONGWORD        2147483647

#ifdef      SASR        /* flag: >> is a signed arithmetic shift right */
#undef      SASR
#define     SASR(x, by) ((x) >> (by))
#else
#define     SASR(x, by) ((x) >= 0 ? (x) >> (by) : (~(-((x) + 1) >> (by))))
#endif      /* SASR */

#include "proto.h"

/*
 *    Prototypes from add.c
 */
extern word gsm_mult    P((word a, word b));
extern longword gsm_L_mult    P((word a, word b));
extern word gsm_mult_r  P((word a, word b));

extern word gsm_div     P((word num, word denum));

extern word gsm_add     P(( word a, word b ));
extern longword gsm_L_add     P(( longword a, longword b ));

extern word gsm_sub     P((word a, word b));
extern longword gsm_L_sub     P((longword a, longword b));

extern word gsm_abs     P((word a));

extern word gsm_norm    P(( longword a ));

extern longword gsm_L_asl     P((longword a, int n));
extern word gsm_asl     P((word a, int n));

extern longword gsm_L_asr     P((longword a, int n));
extern word gsm_asr     P((word a, int n));

/*
 *  Inlined functions from add.h 
 */

/* 
 * #define GSM_MULT_R(a, b) (* word a, word b, !(a == b == MIN_WORD) *) \
 *    (0x0FFFF & SASR(((longword)(a) * (longword)(b) + 16384), 15))
 */
#define GSM_MULT_R(a, b) /* word a, word b, !(a == b == MIN_WORD) */    \
      (SASR( ((longword)(a) * (longword)(b) + 16384), 15 ))

# define GSM_MULT(a,b)   /* word a, word b, !(a == b == MIN_WORD) */    \
      (SASR( ((longword)(a) * (longword)(b)), 15 ))

# define GSM_L_MULT(a, b) /* word a, word b */  \
      (((longword)(a) * (longword)(b)) << 1)

# define GSM_L_ADD(a, b)      \
      ( (a) <  0 ? ( (b) >= 0 ? (a) + (b) \
             : (utmp = (ulongword)-((a) + 1) + (ulongword)-((b) + 1)) \
               >= MAX_LONGWORD ? MIN_LONGWORD : -(longword)utmp-2 )   \
      : ((b) <= 0 ? (a) + (b)   \
                : (utmp = (ulongword)(a) + (ulongword)(b)) >= MAX_LONGWORD \
                ? MAX_LONGWORD : utmp))

/*
 * # define GSM_ADD(a, b)     \
 *    ((ltmp = (longword)(a) + (longword)(b)) >= MAX_WORD \
 *    ? MAX_WORD : ltmp <= MIN_WORD ? MIN_WORD : ltmp)
 */
/* Nonportable, but faster: */

#define     GSM_ADD(a, b)     \
      ((ulongword)((ltmp = (longword)(a) + (longword)(b)) - MIN_WORD) > \
            MAX_WORD - MIN_WORD ? (ltmp > 0 ? MAX_WORD : MIN_WORD) : ltmp)

# define GSM_SUB(a, b)  \
      ((ltmp = (longword)(a) - (longword)(b)) >= MAX_WORD \
      ? MAX_WORD : ltmp <= MIN_WORD ? MIN_WORD : ltmp)

# define GSM_ABS(a)     ((a) < 0 ? ((a) == MIN_WORD ? MAX_WORD : -(a)) : (a))

/* Use these if necessary:

# define GSM_MULT_R(a, b)     gsm_mult_r(a, b)
# define GSM_MULT(a, b)       gsm_mult(a, b)
# define GSM_L_MULT(a, b)     gsm_L_mult(a, b)

# define GSM_L_ADD(a, b)      gsm_L_add(a, b)
# define GSM_ADD(a, b)        gsm_add(a, b)
# define GSM_SUB(a, b)        gsm_sub(a, b)

# define GSM_ABS(a)           gsm_abs(a)

*/

/*
 *  More prototypes from implementations..
 */
extern void Gsm_Coder P((
            struct gsm_state  * S,
            word  * s,  /* [0..159] samples           IN    */
            word  * LARc,     /* [0..7] LAR coefficients    OUT   */
            word  * Nc, /* [0..3] LTP lag       OUT   */
            word  * bc, /* [0..3] coded LTP gain      OUT   */
            word  * Mc, /* [0..3] RPE grid selection  OUT     */
            word  * xmaxc,/* [0..3] Coded maximum amplitude OUT   */
            word  * xMc /* [13*4] normalized RPE samples OUT      */));

extern void Gsm_Long_Term_Predictor P((         /* 4x for 160 samples */
            struct gsm_state * S,
            word  * d,  /* [0..39]   residual signal  IN    */
            word  * dp, /* [-120..-1] d'        IN    */
            word  * e,  /* [0..40]              OUT   */
            word  * dpp,      /* [0..40]              OUT   */
            word  * Nc, /* correlation lag            OUT   */
            word  * bc  /* gain factor                OUT   */));

extern void Gsm_LPC_Analysis P((
            struct gsm_state * S,
            word * s,    /* 0..159 signals      IN/OUT      */
              word * LARc));   /* 0..7   LARc's OUT   */

extern void Gsm_Preprocess P((
            struct gsm_state * S,
            word * s, word * so));

extern void Gsm_Encoding P((
            struct gsm_state * S,
            word  * e,  
            word  * ep, 
            word  * xmaxc,
            word  * Mc, 
            word  * xMc));

extern void Gsm_Short_Term_Analysis_Filter P((
            struct gsm_state * S,
            word  * LARc,     /* coded log area ratio [0..7]  IN  */
            word  * d   /* st res. signal [0..159]    IN/OUT      */));

extern void Gsm_Decoder P((
            struct gsm_state * S,
            word  * LARcr,    /* [0..7]         IN    */
            word  * Ncr,            /* [0..3]         IN    */
            word  * bcr,            /* [0..3]         IN    */
            word  * Mcr,            /* [0..3]         IN    */
            word  * xmaxcr,   /* [0..3]         IN    */
            word  * xMcr,           /* [0..13*4]            IN    */
            word  * s));            /* [0..159]       OUT   */

extern void Gsm_Decoding P((
            struct gsm_state * S,
            word  xmaxcr,
            word  Mcr,
            word  * xMcr,     /* [0..12]        IN    */
            word  * erp));    /* [0..39]        OUT   */

extern void Gsm_Long_Term_Synthesis_Filtering P((
            struct gsm_state* S,
            word  Ncr,
            word  bcr,
            word  * erp,            /* [0..39]          IN  */
            word  * drp));    /* [-120..-1] IN, [0..40] OUT       */

void Gsm_RPE_Decoding P((
      struct gsm_state *S,
            word xmaxcr,
            word Mcr,
            word * xMcr,  /* [0..12], 3 bits             IN      */
            word * erp)); /* [0..39]                     OUT     */

void Gsm_RPE_Encoding P((
            struct gsm_state * S,
            word    * e,            /* -5..-1][0..39][40..44     IN/OUT  */
            word    * xmaxc,        /*                              OUT */
            word    * Mc,           /*                              OUT */
            word    * xMc));        /* [0..12]                      OUT */

extern void Gsm_Short_Term_Synthesis_Filter P((
            struct gsm_state * S,
            word  * LARcr,    /* log area ratios [0..7]  IN */
            word  * drp,            /* received d [0...39]     IN */
            word  * s));            /* signal   s [0..159]    OUT */

extern void Gsm_Update_of_reconstructed_short_time_residual_signal P((
            word  * dpp,            /* [0...39] IN    */
            word  * ep,       /* [0...39] IN    */
            word  * dp));           /* [-120...-1]  IN/OUT  */

/*
 *  Tables from table.c
 */
#ifndef     GSM_TABLE_C

extern word gsm_A[8], gsm_B[8], gsm_MIC[8], gsm_MAC[8];
extern word gsm_INVA[8];
extern word gsm_DLB[4], gsm_QLB[4];
extern word gsm_H[11];
extern word gsm_NRFAC[8];
extern word gsm_FAC[8];

#endif      /* GSM_TABLE_C */

/*
 *  Debugging
 */
#ifdef NDEBUG

#     define      gsm_debug_words(a, b, c, d)         /* nil */
#     define      gsm_debug_longwords(a, b, c, d)           /* nil */
#     define      gsm_debug_word(a, b)                /* nil */
#     define      gsm_debug_longword(a, b)            /* nil */

#else /* !NDEBUG => DEBUG */

      extern void  gsm_debug_words     P((char * name, int, int, word *));
      extern void  gsm_debug_longwords P((char * name, int, int, longword *));
      extern void  gsm_debug_longword  P((char * name, longword));
      extern void  gsm_debug_word      P((char * name, word));

#endif /* !NDEBUG */

#include "unproto.h"

#endif      /* PRIVATE_H */

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