/*
   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 encoder.                *
 *                                                                   *
 *    Usage : coder speech_file  bitstream_file                      *
 *-------------------------------------------------------------------*/

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

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

int main(int argc, char *argv[] )
{	
  FILE *f_speech;               /* File of speech data                   */
  FILE *f_serial;               /* File of serial bits for transmission  */

  extern Word16 *new_speech;     /* Pointer to new speech data            */

  Word16 prm[PRM_SIZE+1];        /* Analysis parameters.                  */
  Word16 serial[SERIAL_SIZE];    /* Output bitstream buffer               */
  Word16 syn[L_FRAME];           /* Buffer for synthesis speech           */

  Word16 i, frame;               /* frame counter */
  Word32 count_frame;

  /* For G.729B */
  Word16 nb_words;
  Word16 vad_enable;

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

/*--------------------------------------------------------------------------*
 * Open speech file and result file (output serial bit stream)              *
 *--------------------------------------------------------------------------*/

  if ( argc != 4 )
    {
       printf("Usage :%s speech_file  bitstream_file  VAD_flag\n",argv[0]);
       printf("\n");
       printf("Format for speech_file:\n");
       printf("  Speech is read from a binary file of 16 bits PCM data.\n");
       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("VAD flag:\n");
       printf("  0 to disable the VAD\n");
       printf("  1 to enable the VAD\n");
       exit(1);
    }

/*解釋：如果返回的指針為空，表示不能打開argv[1]對應的文件，則給出提示信息
“error on open ？？？ file!”，相反輸出Input speech file ：？？？*/
  if ( (f_speech = fopen(argv[1], "rb")) == NULL) {
     printf("%s - Error opening file  %s !!\n", argv[0], argv[1]);
     exit(0);
  }
  printf(" Input speech file    :  %s\n", argv[1]);

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

  vad_enable = (Word16)atoi(argv[3]);
  if (vad_enable == 1)
    printf(" VAD enabled\n");
  else
    printf(" VAD disabled\n");

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

/*--------------------------------------------------------------------------*
 * Initialization of the coder.                                             *
 *--------------------------------------------------------------------------*/

  Init_Pre_Process();
  Init_Coder_ld8k();
  for(i=0; i<PRM_SIZE; i++) prm[i] = (Word16)0;

  /* for G.729B */
  Init_Cod_cng();

 /* To force the input and output to be time-aligned the variable SYNC
    has to be defined. Note: the test vectors were generated with this option
    disabled
  */

#ifdef SYNC
  /* Read L_NEXT first speech data */

  fread(&new_speech[-L_NEXT], sizeof(Word16), L_NEXT, f_speech);
#ifdef HARDW
    /* set 3 LSB's to zero */
    for(i=0; i < L_NEXT; i++)
      new_speech[-L_NEXT+i] = new_speech[-L_NEXT+i] & 0xFFF8;
#endif
  Pre_Process(&new_speech[-L_NEXT], L_NEXT);
#endif

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

  frame =0;
  count_frame = 0L;
  while( fread(new_speech, sizeof(Word16), L_FRAME, f_speech) == L_FRAME)
	  /*fread(fa,4,5,fp); 其意義是從fp所指的文件中，每次讀4個字節
	  (一個實數)送入實數組fa中，連續讀5次，即讀5個實數到fa中。*/
  {

    printf("Frame = %ld\r", count_frame++);

#ifdef HARDW
    /* set 3 LSB's to zero */
    for(i=0; i < L_FRAME; i++) new_speech[i] = new_speech[i] & 0xFFF8;
#endif

    if (frame == 32767) frame = 256;
    else frame++;

    Pre_Process(new_speech, L_FRAME);

    Coder_ld8k(prm, syn, frame, vad_enable);

    prm2bits_ld8k( prm, serial);

    nb_words = add((Word16)serial[1], 2);
    fwrite(serial, sizeof(Word16), nb_words, f_serial);
    
  }

  printf("%ld frames processed\n", count_frame);
  
  return (0);
}