strip.c

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/*
 * Copyright (c) 1991-2006 Kawahara Lab., Kyoto University
 * Copyright (c) 2000-2005 Shikano Lab., Nara Institute of Science and Technology
 * Copyright (c) 2005-2006 Julius project team, Nagoya Institute of Technology, Nagoya Institute of Technology
 * All rights reserved
 */

#include <sent/stddefs.h>
#include <sent/speech.h>

#define IS_INVALID_SAMPLE(A) ((A) == 0 || (A) == -32767)

#define WINDOWLEN 16

int
strip_zero(SP16 a[], int len)
{
  int src,dst;
  int bgn,mode,j;

  dst = 0;
  bgn = 0;
  mode = 0;

  for (src = 0; src < len; src++) {
    if (IS_INVALID_SAMPLE(a[src])) {
      if (mode == 0) {          /* first time */
        bgn = src;
        mode = 1;
      }
      /* skip */
    } else {
      if (mode == 1) {
        mode = 0;
        if ((src - bgn) < WINDOWLEN) {
          for(j=bgn;j<src;j++) {
            a[dst++] = a[j];
          }
        } else {
          /* deleted (leave uncopied) */
          /*j_printf("Warning: sample %d-%d is invalid, stripped\n", bgn, src-1);*/
        }
      }
      a[dst++] = a[src];
    }
  }
  /* end process */
  if (mode == 1) {
    mode = 0;
    if ((src - bgn) < WINDOWLEN) {
      /* restore */
      for(j=bgn;j<src;j++) {
        a[dst++] = a[j];
      }
    } else {
      /* deleted (leave uncopied) */
      /*j_printf("Warning: sample %d-%d is invalid, stripped\n", bgn, src-1);*/
    }
  }
  
  return(dst);
}

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