55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
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/******************************************************************************
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* *
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* Copyright (C) 1992-1995 Tony Robinson *
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* *
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* See the file doc/LICENSE.shorten for conditions on distribution and usage *
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* *
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******************************************************************************/
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/*
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* $Id$
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*/
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <setjmp.h>
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#include "shorten.h"
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void init_offset(slong **offset,int nchan,int nblock,int ftype)
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{
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slong mean = 0;
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int chan, i;
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/* initialise offset */
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switch(ftype)
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{
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case TYPE_AU1:
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case TYPE_S8:
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case TYPE_S16HL:
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case TYPE_S16LH:
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case TYPE_ULAW:
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case TYPE_AU2:
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case TYPE_AU3:
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case TYPE_ALAW:
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mean = 0;
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break;
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case TYPE_U8:
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mean = 0x80;
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break;
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case TYPE_U16HL:
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case TYPE_U16LH:
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mean = 0x8000;
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break;
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default:
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fprintf(stderr, "Unknown file type: %d", ftype);
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}
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for(chan = 0; chan < nchan; chan++)
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for(i = 0; i < nblock; i++)
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offset[chan][i] = mean;
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}
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