mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-16 10:20:30 +00:00
86bc05b331
Submitted by: phk
77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/*
|
|
* Copyright (c) 2000 Hellmuth Michaelis. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*---------------------------------------------------------------------------
|
|
*
|
|
* i4b_l1lib.c - general useful L1 procedures
|
|
* ------------------------------------------
|
|
*
|
|
* $Id: i4b_l1lib.c,v 1.3 2000/05/29 15:41:41 hm Exp $
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
* last edit-date: [Mon May 29 15:24:21 2000]
|
|
*
|
|
*---------------------------------------------------------------------------*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
|
|
|
|
#include <machine/i4b_ioctl.h>
|
|
#include <machine/i4b_trace.h>
|
|
|
|
#include <i4b/layer1/i4b_l1.h>
|
|
|
|
#define TEL_IDLE_MIN (BCH_MAX_DATALEN/2)
|
|
|
|
/*---------------------------------------------------------------------------*
|
|
* telephony silence detection
|
|
*---------------------------------------------------------------------------*/
|
|
int
|
|
i4b_l1_bchan_tel_silence(unsigned char *data, int len)
|
|
{
|
|
register int i = 0;
|
|
register int j = 0;
|
|
|
|
/* count idle bytes */
|
|
|
|
for(;i < len; i++)
|
|
{
|
|
if((*data >= 0xaa) && (*data <= 0xac))
|
|
j++;
|
|
data++;
|
|
}
|
|
|
|
#ifdef NOTDEF
|
|
printf("i4b_l1_bchan_tel_silence: got %d silence bytes in frame\n", j);
|
|
#endif
|
|
|
|
if(j < (TEL_IDLE_MIN))
|
|
return(0);
|
|
else
|
|
return(1);
|
|
|
|
}
|