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123 lines
4.0 KiB
Groff
123 lines
4.0 KiB
Groff
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.\" Copyright (c) 1997 Andreas Klemm <andreas@FreeBSD.org>. Neuss.
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.\" 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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.\" $Id:$
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.Dd August 17, 1997
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.Dt MPEG_MUSICIN 1
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.Os FreeBSD
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.Sh NAME
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.Nm mpeg_musicin
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.Nd MPEG/audio Layer 1 and Layer 2 decoder
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.Sh SYNOPSIS
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.Nm mpeg_musicin
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queries for all arguments, or
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.br
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.Nm mpeg_musicin
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.Op Fl l Ar lay
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.br
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.Op Fl m Ar mode
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.br
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.Op Fl p Ar psy
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.br
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.Op Fl s Ar sfrq
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.br
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.Op Fl b Ar br
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.br
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.Op Fl d Ar emp
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.br
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.Op Fl c
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.br
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.Op Fl o
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.br
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.Op Fl e
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.br
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inputCM
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.br
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.Op Ar outBS
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.br
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.Sh DESCRIPTION
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The encoder and decoder software are configured to output
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the coded audio bitstreams as a string of hexadecimal ascii
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characters. For greater compression efficiency, compile flag,
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BS_FORMAT, in common.h can be switched to configure the bitstream
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reading and writing routines to process raw binary bitstreams.
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.br
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The decoder program has a very crude implementation of bitstream
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synchword detection. It may not be able to correctly decode valid
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bitstreams which have false synchword patterns in the ancillary data
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portion of the bitstream.
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.Sh RESTRICTIONS
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The software implements levels I and II and psychophysical auditory
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models I and II as described in the ISO 3-11171 rev 1 standard.
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There are future plans to implement level III.
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.br
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The input/output audio data may either be headerless raw 16 bit data
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or alternatively an AIFF formatted file (Audio Interchange File Format)
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with certain limitations.
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.br
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For more information on the AIFF format see the postscript file
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/sgi/aiff-c.9.26.91.ps at the anonymous ftp site FTP.SGI.COM
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(192.48.153.1).
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.br
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The AIFF formatted file is a convenient way for storing sampling rate
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of the audio file.
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.br
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The encoder and decoder software are configured to output the coded
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audio bitstreams as a string of hexadecimal ascii characters.
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For greater compression efficiency, compile flag, BS_FORMAT,
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in common.h can be switched to configure the bitstream reading
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and writing routines to process raw binary bitstreams.
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.br
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This software has been run and verified on a large variety of
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computers and operating systems. In particular UNIX, MS_DOS (with
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MicroSoft C version 6), Macintosh, AIX Platform (RS6000) and Convex.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Sy -l lay
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use layer <lay> coding (default: 2)
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.It Sy -m mode
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channel mode : s/d/j/m (default: s)
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.It Sy -p psy
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psychoacoustic model 1/2 (default: 2)
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.It Sy -s sfrq
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input smpl rate in kHz (default: 44.1)
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.It Sy -b br
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total bitrate in kbps (default: 384)
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.It Sy -d emp
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de-emphasis n/5/c (default: n)
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.It Sy -c
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mark as copyright
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.It Sy -o
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mark as original
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.It Sy -e
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add error protection
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.It Sy inputPCM
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input PCM sound file (standard or AIFF)
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.It Sy outBS
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output bit stream of encoded audio (dflt inName+.mpg)
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.Sh SEE ALSO
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.Xr mpeg_musicout 1
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.Sh HISTORY
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Written by Andreas Klemm, August 17, 1997
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