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/*

  This program is part of the TACLeBench benchmark suite.
  Version V 2.0

  Name: gsm_dec

  Author: Jutta Degener and Carsten Bormann,
   Technische Universitaet Berlin

  Function: Decoding of GSM data

  Source: included in MediaBench/gsm

  Original name: gsm_decode

  Changes: no major functional changes

  License: see the accompanying COPYRIGHT file

*/


#include "../extra.h"
#include "gsm.h"
#include "add.h"
#include "data.h"
#include "private.h"

#define SAMPLES 20

/*
  Forward declaration of global variables
*/

struct gsm_state gsm_dec_state;
gsm gsm_dec_state_ptr;
volatile int gsm_dec_result;

/*
  Forward declaration of functions
*/

extern word gsm_dec_sub( word a, word b );
extern word gsm_dec_asl( word a, int n );
void gsm_dec_Decoding_of_the_coded_Log_Area_Ratios(
  word *LARc,    /* coded log area ratio [0..7]  IN  */
  word *LARpp ); /* out: decoded ..      */

void gsm_dec_Coefficients_0_12( word *LARpp_j_1, word *LARpp_j, word *LARp );

void gsm_dec_LARp_to_rp( word *LARp ); /* [0..7] IN/OUT  */

extern int gsm_dec_decode( gsm, gsm_byte *, gsm_signal * );

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

void gsm_dec_RPE_Decoding( word xmaxcr, word Mcr,
                           word *xMcr,  /* [0..12], 3 bits IN  */
                           word *erp ); /* [0..39]         OUT */

void gsm_dec_RPE_grid_positioning( word Mc,  /* grid position  IN  */
                                   word *xMp, /* [0..12]    IN  */
                                   word *ep   /* [0..39]    OUT */
                                 );

void gsm_dec_APCM_inverse_quantization( word *xMc,   /* [0..12]      IN  */
                                        word mant, word exp,
                                        word *xMp ); /* [0..12]      OUT */

extern word gsm_dec_asr( word a, int n );

void gsm_dec_APCM_quantization_xmaxc_to_exp_mant(
  word xmaxc,       /* IN   */
  word *exp_out,    /* OUT  */
  word *mant_out ); /* OUT  */

void gsm_dec_Postprocessing( struct gsm_state *S, word *s );

void gsm_dec_Coefficients_13_26( word *LARpp_j_1, word *LARpp_j,
                                 word *LARp );

void gsm_dec_Coefficients_40_159( word *LARpp_j, word *LARp );

void gsm_dec_Short_term_synthesis_filtering( struct gsm_state *S,
    word *rrp, /* [0..7]          IN  */
    int k,     /* k_end - k_start     */
    word *wt,  /* [0..k-1]        IN  */
    word *sr   /* [0..k-1]        OUT */
                                           );

void gsm_dec_Short_Term_Synthesis_Filter(
  struct gsm_state *S, word *LARcr, /* received log area ratios [0..7] IN  */
  word *wt,                         /* received d [0..159]             IN  */
  word *s                           /* signal   s [0..159]             OUT */
);

void gsm_dec_Coefficients_27_39( word *LARpp_j_1, word *LARpp_j, word *LARp );

gsm gsm_dec_create( void );
void gsm_dec_init( void );
void gsm_dec_main( void );
//int main( void );

/* add.c */

word gsm_dec_sub( word a, word b )
{
  longword diff = ( longword )a - ( longword )b;
  return saturate( diff );
}

word gsm_dec_asl( word a, int n )
{
  if ( n >= 16 )
    return 0;
  if ( n <= -16 )
    return -( a < 0 );
  if ( n < 0 )
    return gsm_dec_asr( a, -n );
  return a << n;
}

/* short_term.c */
/*
  SHORT TERM ANALYSIS FILTERING SECTION
*/

/* 4.2.8 */

void gsm_dec_Decoding_of_the_coded_Log_Area_Ratios(
  word *LARc,   /* coded log area ratio [0..7]  IN  */
  word *LARpp ) /* out: decoded ..      */
{
  word temp1 /* for STEP */;
  long ltmp; /* for GSM_ADD */

  /*  This procedure requires for efficient implementation
      two tables.

      INVA[1..8] = integer( (32768 * 8) / real_A[1..8])
      MIC[1..8]  = minimum value of the LARc[1..8]
  */

  /*  Compute the LARpp[1..8]
  */

  /*  for (i = 1; i <= 8; i++, B++, MIC++, INVA++, LARc++, LARpp++) {

        temp1  = GSM_ADD( *LARc, *MIC ) << 10;
        temp2  = *B << 1;
        temp1  = GSM_SUB( temp1, temp2 );

        temp1  = GSM_MULT_R( *INVA, temp1 );
         LARpp = GSM_ADD( temp1, temp1 );
      }
  */

#undef STEP
#define STEP(B, MIC, INVA)                                                     \
  temp1 = GSM_ADD(*LARc++, MIC) << 10;                                         \
  temp1 = GSM_SUB(temp1, B << 1);                                              \
  temp1 = GSM_MULT_R(INVA, temp1);                                             \
  *LARpp++ = GSM_ADD(temp1, temp1);

  STEP( 0, -32, 13107 );
  STEP( 0, -32, 13107 );
  STEP( 2048, -16, 13107 );
  STEP( 2560, -16, 13107 );

  STEP( 94, -8, 19223 );
  STEP( 1792, -8, 17476 );
  STEP( 341, -4, 31454 );
  STEP( 1144, -4, 29708 );

  /*  NOTE: the addition of *MIC is used to restore the sign of *LARc.
  */
}

/* 4.2.9 */
/* Computation of the quantized reflection coefficients
*/

/* 4.2.9.1  Interpolation of the LARpp[1..8] to get the LARp[1..8]
*/

/*
  Within each frame of 160 analyzed speech samples the short term
  analysis and synthesis filters operate with four different sets of
  coefficients, derived from the previous set of decoded LARs(LARpp(j-1))
  and the actual set of decoded LARs (LARpp(j))

  (Initial value: LARpp(j-1)[1..8] = 0.)
*/


void gsm_dec_Coefficients_0_12( word *LARpp_j_1, word *LARpp_j, word *LARp )
{
  int i;
  longword ltmp;

  _Pragma( "loopbound min 8 max 8" )
  for ( i = 1; i <= 8; i++, LARp++, LARpp_j_1++, LARpp_j++ ) {
    *LARp = GSM_ADD( SASR( *LARpp_j_1, 2 ), SASR( *LARpp_j, 2 ) );
    *LARp = GSM_ADD( *LARp, SASR( *LARpp_j_1, 1 ) );
  }
}

/* 4.2.9.2 */

void gsm_dec_LARp_to_rp( word *LARp ) /* [0..7] IN/OUT  */
/*
  The input of this procedure is the interpolated LARp[0..7] array.
  The reflection coefficients, rp[i], are used in the analysis
  filter and in the synthesis filter.
*/
{
  int i;
  word temp;
  longword ltmp;

  _Pragma( "loopbound min 8 max 8" )
  for ( i = 1; i <= 8; i++, LARp++ ) {

    /* temp = GSM_ABS( *LARp );

       if (temp < 11059) temp <<= 1;
       else if (temp < 20070) temp += 11059;
       else temp = GSM_ADD( temp >> 2, 26112 );

     * *LARp = *LARp < 0 ? -temp : temp;
    */

    if ( *LARp < 0 ) {
      temp = *LARp == MIN_WORD ? MAX_WORD : -( *LARp );
      *LARp = -( ( temp < 11059 ) ? temp << 1
                 : ( ( temp < 20070 ) ? temp + 11059
                     : GSM_ADD( temp >> 2, 26112 ) ) );
    } else {
      temp = *LARp;
      *LARp = ( temp < 11059 )
              ? temp << 1
              : ( ( temp < 20070 ) ? temp + 11059 : GSM_ADD( temp >> 2, 26112 ) );
    }
  }
}

void gsm_dec_Decoder( 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 */
{
  int j, k;
  word erp[40], wt[160];
  word *drp = S->dp0 + 120;

  _Pragma( "loopbound min 4 max 4" )
  for ( j = 0; j <= 3; j++, xmaxcr++, bcr++, Ncr++, Mcr++, xMcr += 13 ) {

    gsm_dec_RPE_Decoding( *xmaxcr, *Mcr, xMcr, erp );
    gsm_dec_Long_Term_Synthesis_Filtering( S, *Ncr, *bcr, erp, drp );

    _Pragma( "loopbound min 40 max 40" )
    for ( k = 0; k <= 39; k++ )
      wt[j * 40 + k] = drp[k];
  }

  gsm_dec_Short_Term_Synthesis_Filter( S, LARcr, wt, s );
  gsm_dec_Postprocessing( S, s );
}

/* 4.3.2 */
void gsm_dec_Long_Term_Synthesis_Filtering(
  struct gsm_state *S,
  word Ncr, word bcr, word *erp, /* [0..39]    IN              */
  word *drp                      /* [-120..-1] IN, [0..40] OUT */
)
/*
  This procedure uses the bcr and Ncr parameter to realize the
  long term synthesis filtering.  The decoding of bcr needs
  table 4.3b.
*/
{
  longword ltmp; /* for ADD */
  int k;
  word brp, drpp, Nr;

  /*  Check the limits of Nr.
  */
  Nr = Ncr < 40 || Ncr > 120 ? S->nrp : Ncr;
  S->nrp = Nr;

  /*  Decoding of the LTP gain bcr
  */
  brp = gsm_dec_QLB[bcr];

  /*  Computation of the reconstructed short term residual