decoder.c~

itu-t g.729的源代码

/*
   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( fread(serial, 1, SERIAL_SIZE, f_serial) == SERIAL_SIZE)
  {
    printf("Frame =%d\r", count_frame++);
    bits2prm_ld8k(serial, &parm[1]); /* 注意这里一定要是&parm[1] */
    parm[0] = 0;  /* 假设没有丢帧 */
    parm[4] = 0 ; /* 假设数据效验正常 */
    Decod_ld8k(parm, voicing, synth, Az_dec, &T0_first, &Vad);
    Post_Filter(synth, Az_dec, T2);
    Post_Process(synth, L_FRAME);
    fwrite(synth, sizeof(short), L_FRAME, f_syn);
  } 
  
  printf("%ld frames decoded\n", count_frame);
  return(0);
}