93 lines
3.0 KiB
Groff
93 lines
3.0 KiB
Groff
.\"
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.\" Copyright (c) 1999 Hellmuth Michaelis. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: g711conv.1,v 1.3 1999/12/13 22:11:55 hm Exp $
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.\"
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.\" $FreeBSD$
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.\"
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.\" last edit-date: [Mon Dec 13 22:54:33 1999]
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.\"
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.Dd March 15, 1999
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.Dt G711CONV 1
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.Os
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.Sh NAME
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.Nm g711conv
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.Nd conversions according to G.711
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.Sh SYNOPSIS
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.Nm
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.Op Fl a
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.Op Fl u
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.Op Fl P
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.Op Fl A
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.Op Fl R
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.Sh DESCRIPTION
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The
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.Nm
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utility
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is part of the isdn4bsd package and is used to convert between the A-Law and
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u-law formats as specified in ITU G.711. It is based on a freely available
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and freely usable reference implementation done by Sun Microsystems, Inc.
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.Pp
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The following options are available:
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.Bl -tag -width Ds
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.It Fl a
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Convert A-law to u-law
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.It Fl u
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Convert u-law to A-law
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.It Fl r
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Reverse bits before conversion
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.It Fl R
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Reverse bits after conversion
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.It Fl P
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Print the resulting conversion tables (as C-source) to stdout instead of
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doing the actual conversion.
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.El
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.Sh STANDARDS
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A-Law and u-Law conversions are specified in ITU Recommendation G.711.
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.Pp
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The reference implementation done by Sun Microsystems, Inc. is available
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from http://www.itu.int/itudoc/itu-t/rec/g/g700-799/refimpl.txt
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.Sh EXAMPLES
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The command:
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.Bd -literal -offset indent
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g711conv -P -a
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.Ed
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.Pp
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prints out the A-law to u-law conversion table as C-source to stdout.
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.Pp
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The command:
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.Bd -literal -offset indent
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cat max_headroom.ul | g711conv -u -R > /dev/i4btel0
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.Ed
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.Pp
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converts the u-law coded voice of Max Headroom to A-law, reverses the
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bits of the result and moves that to an active isdn4bsd telephone connection.
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.Sh AUTHORS
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The
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.Nm
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utility and this manpage were written by
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.An Hellmuth Michaelis Aq hm@kts.org
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based on the G.711 conversion reference code written by Sun Microsystems,
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Inc. and code contributed to isdn4bsd by Stefan Bethke.
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