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pcmfade(1) General Commands Manual pcmfade(1) NAME pcmfade - create a fade-in or fade-out in a PCM file SYNOPSIS pcmfade 0%-offset 100%-offset file DESCRIPTION pcmfade can be used to create a fade-in (0%-offset < 100%-offset) or a fade-out (0%-offset > 100%-offset) in a raw PCM audio file. OPERANDS The following operands are supported: 0%-offset Specify the file offset at which the volume should be faded to 0% (i.e. silence). 100%-offset Specify the file offset at which the volume should reach the origi- nal level. file The file to work with. The file must be a raw PCM audio file: lin- ear signed 16 bits, stereo, 44.1 kHz, intel byte order (``little en- dian''). This is also known as ``CD quality'' audio format. It is created by tosha(1), for example. WARNING: The file is modified in-place. If the original file contents need to preserved, you must make a backup copy before using pcmfade! OFFSETS File offsets can be specified in two ways: as time stamp, or as sample count. Note: 1 sample = 4 bytes (16 bits left and 16 bits right). In both cases, the offset can be relative to the beginning of the file, or (if pre- fixed with a minus sign) relative to the end of the file. Thus, the offset syntax is: [-] [minutes] : seconds | [-] samples minutes is an integer value, which may be omitted. The default value is 0. Note that the colon may not be omitted, because it indicates the time stamp syntax. if the colon is missing, the value is assumed to be a sample count, not a time stamp. seconds is an integer or floating point value. It can be larger than 60, for example ``1:80'' is the same as ``2:20'', and ``:120.5'' is the same as ``2:00.5''. samples is an integer value (1 sample = 4 bytes). There are 44100 samples per second. If no sign is specified, the offset is assumed to be relative to the begin- ning of the file. If a minus sign is present, the offset is relative to the end of the file. For example, if the length of the file is four min- utes, ``-1:15'' specifies the same offset as ``2:45''. SEE ALSO tosha(1), pcmplay(1), sox(1), intro(1) BUGS Yes. This is an alpha version. AUTHOR Copyright (C) 1997-1999 Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de> All rights reserved. For more information, please refer to the file LI- CENCE which is included with the source distribution. Internet references: http://www.heim3.tu-clausthal.de/~olli/tosha/ That's the homepage of the CD-DA reader tosha(1) which also contains the latest version of pcmfade. 21 May 1997 pcmfade(1)
NAME | SYNOPSIS | DESCRIPTION | OPERANDS | OFFSETS | SEE ALSO | BUGS | AUTHOR
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