/*
   ITU-T G.729 Speech Coder with Annex B    ANSI-C Source Code
   Version 1.4    Last modified: November 2000

   Copyright (c) 1996,
   AT&T, France Telecom, NTT, Universite de Sherbrooke, Lucent Technologies,
   Rockwell International
   All rights reserved.
*/

/*-----------------------------------------------------------------*
 * Main program of the ITU-T G.729  8 kbit/s decoder.              *
 *                                                                 *
 *    Usage : decoder  bitstream_file  synth_file                  *
 *                                                                 *
 *-----------------------------------------------------------------*/

#include <stdlib.h>
#include <stdio.h>

#include "typedef.h"
#include "basic_op.h"
#include "ld8k.h"
#include "dtx.h"
#include "octet.h"

/*-----------------------------------------------------------------*
 *            Main decoder routine                                 *
 *-----------------------------------------------------------------*/

int main(int argc, char *argv[] )
{
  Word16  synth_buf[L_FRAME+M], *synth; /* Synthesis                   */
  Word16  parm[PRM_SIZE+2];     /* Synthesis parameters        */
  Word16  Az_dec[MP1*2], *ptr_Az; /* Decoded Az for post-filter  */
  Word16  T0_first;             /* Pitch lag in 1st subframe   */
  Word16  pst_out[L_FRAME];     /* Postfilter output           */

  Word16  voicing;              /* voicing from previous frame */
  Word16  sf_voic;              /* voicing for subframe        */

  Word16  i, Vad;
  Word32  count_frame;
  FILE   *f_syn, *f_serial;

  printf("\n");
  printf("***********     ITU G.729 8 KBIT/S SPEECH DECODER    ***********\n");
  printf("                        (WITH ANNEX B)                        \n");
  printf("\n");
  printf("------------------- Fixed point C simulation -------------------\n");
  printf("\n");
  printf("------------------        Version 1.4         ------------------\n");
  printf("\n");

  /* Passed arguments */

  if ( argc != 3 )
    {
      printf("Usage :%s bitstream_file  outputspeech_file\n",argv[0]);
      printf("\n");
      printf("Format for bitstream_file:\n");
      printf("  One (2-byte) synchronization word,\n");
      printf("  One (2-byte) size word,\n");
      printf("  80 words (2-byte) containing 80 bits.\n");
      printf("\n");
      printf("Format for outputspeech_file:\n");
      printf("  Output is written to a binary file of 16 bits data.\n");
      exit( 1 );
    }

  /* Open file for synthesis and packed serial stream */

  if( (f_serial = fopen(argv[1],"rb") ) == NULL )
    {
      printf("%s - Error opening file  %s !!\n", argv[0], argv[1]);
      exit(0);
    }

  if( (f_syn = fopen(argv[2], "wb") ) == NULL )
    {
      printf("%s - Error opening file  %s !!\n", argv[0], argv[2]);
      exit(0);
    }
  printf("Input bitstream file  :   %s\n",argv[1]);
  printf("Synthesis speech file :   %s\n",argv[2]);

#ifndef OCTET_TX_MODE
  printf("OCTET TRANSMISSION MODE is disabled\n");
#endif

  /*-----------------------------------------------------------------*
   *           Initialization of decoder                             *
   *-----------------------------------------------------------------*/

  for (i=0; i<M; i++) synth_buf[i] = 0;
  synth = synth_buf + M;

  Init_Decod_ld8k();
  Init_Post_Filter();
  Init_Post_Process();
  voicing = 60;

  /* for G.729b */
  Init_Dec_cng();

  /*-----------------------------------------------------------------*
   *            Loop for each "L_FRAME" speech data                  *
   *-----------------------------------------------------------------*/

  count_frame = 0L;
  while(read_frame(f_serial, parm) != 0){
    
    printf("Frame = %ld\r", count_frame++);

    Decod_ld8k(parm, voicing, synth, Az_dec, &T0_first, &Vad);

    /* Postfilter */
    voicing = 0;
    ptr_Az = Az_dec;
    for(i=0; i<L_FRAME; i+=L_SUBFR) {
      Post(T0_first, &synth[i], ptr_Az, &pst_out[i], &sf_voic, Vad);
      if (sf_voic != 0) { voicing = sf_voic;}
      ptr_Az += MP1;
    }
    Copy(&synth_buf[L_FRAME], &synth_buf[0], M);
    
    Post_Process(pst_out, L_FRAME);
    
#ifdef HARDW
    {
      Word16 *my_pt;
      Word16 my_temp;
      int my_i;
      my_pt = pst_out;
      for(my_i=0; my_i < L_FRAME; my_i++) {
        my_temp = *my_pt;
        my_temp = add( my_temp, (Word16) 4); /* rounding on 13 bit */
        my_temp = my_temp & 0xFFF8; /* mask on 13 bit */
        *my_pt++ = my_temp;
      }
    }
#endif

    fwrite(pst_out, sizeof(Word16), L_FRAME, f_syn);
  }
  
  printf("%ld frames decoded\n", count_frame);
  return(0);
}