coder.c

这是G.723和G.729的音频编解码的源代码

/* Version 2.0    Last modified: 6/30/95 */

/*
   ITU-T G.729 Speech Coder     ANSI-C Source Code
   Copyright (c) 1995, AT&T, France Telecom, NTT, Universite de Sherbrooke.
   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 "count.h"
#include "ld8k.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];          /* Analysis parameters.                  */
  Word16 serial[SERIAL_SIZE];    /* Output bitstream buffer               */
  Word16 syn[L_FRAME];           /* Buffer for synthesis speech           */

  Word16 i, frame;               /* frame counter */

  printf("\n");
  printf("***********     ITU G.729 8 KBIT/S SPEECH CODER    ***********\n");
  printf("\n");
  printf("------------------- Fixed point C simulation -----------------\n");
  printf("\n");
  printf("-----------------          Version 2.0        ----------------\n");
  printf("\n");


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

  if ( argc != 3 )
    {
       printf("Usage : coder speech_file  bitstream_file\n");
       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 word (2-byte) to indicate erasure,\n");
       printf("  One word (2-byte) to indicate size,\n");
       printf("  80 words (2-byte) containing 80 bits.\n");
       printf("\n");
       exit(1);
    }

  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]);

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

  Init_Pre_Process();
  Init_Coder_ld8k();
  Init_WMOPS_counter();         /* Compute complexity */
  for(i=0; i<PRM_SIZE; i++) prm[i] = (Word16)0;

#define SYNC            /* used to force input and output to be in sync */
#ifdef SYNC
  /* Read L_NEXT first speech data */

  fread(&new_speech[-L_NEXT], sizeof(Word16), L_NEXT, f_speech);
  Pre_Process(&new_speech[-L_NEXT], L_NEXT);
#endif

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

  frame =0;
  while( fread(new_speech, sizeof(Word16), L_FRAME, f_speech) == L_FRAME)
  {
    Reset_WMOPS_counter();      /* reset WMOPS counter for the new frame */

    Pre_Process(new_speech, L_FRAME);

    Coder_ld8k(prm, syn);

    prm2bits_ld8k( prm, serial);

    if (fwrite(serial, sizeof(Word16), SERIAL_SIZE, f_serial) != SERIAL_SIZE)
      printf("Write Error for frame %d\n", frame);

    fwc();                      /* function worst case */
    WMOPS_output();             /* output WMOPS values for current frame */
    frame++;
  }
  return (0);
}