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Under GNU General Public License
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TOAST(1) TOAST(1)
NAME
toast -- GSM 06.10 lossy sound compression
SYNOPSIS
toast [ -cdfpvhualsFC ] [ filename... ]
untoast [ -cfpvhuaslF ] [ filename... ]
tcat [ -vhuaslF ] [ filename... ]
DESCRIPTION
Toast compresses the sound files given on its command line. Each file is replaced
by a file with the extension .gsm . If no files are specified, the compression is
applied to the standard input, and its result is written to standard output.
Toasted files can be restored to something not quite unlike their original form by
running toast -d , or untoast , on the .gsm-files or standard input.
The program tcat (the same as running untoast -c ) uncompresses its input on stan-
dard output, but leaves the compressed .gsm-files alone.
When files are compressed or uncompressed into other files, the ownership (if run
by root), modes, accessed and modified times are maintained between both versions.
OPTIONS
-c (cat) Write to the standard output; no files are changed.
-d (decode) Decode, rather than encode, the files.
-f (force) Force replacement of output files if they exist. If -f is omitted
and toast (or untoast) is run interactively from a terminal, the user is
prompted as to whether the file should be replaced.
-p (precious) Do not delete the source files. Source files are implicitly left
alone whenever -c is specified or tcat is run.
-C (LTP cut-off) Ignore most sample values when calculating the GSM long-term
correlation lag during encoding. (The multiplications that do this are a
bottleneck of the algorithm.) The resulting encoding process will not pro-
duce exactly the same results as GSM 06.10 would, but remains close enough
to be compatible.
The -C option applies only to the encoder and is silently ignored by the
decoder.
-F (fast) On systems with a floating point processor, but without a multiplica-
tion instruction, -F sacrifices standard conformance to performance and
nearly doubles the speed of the algorithm.
The resulting encoding and decoding process will not produce exactly the
same results as GSM 06.10 would, but remains close enough to be compatible.
The default is standard-conforming operation.
-v (version) outputs the version of toast (or untoast or tcat) to stdout and
exits.
-h (help) prints a short overview of the options.
Toast, untoast and tcat try to guess the appropriate audio data format from the
file suffix. Command line options can also specify a format to be used for all
files.
The following formats are supported:
-u (?U-law) 8 kHz, 8 bit ?U-law encoding (file suffix .u)
-a (A-law) 8 kHz, 8 bit A-law encoding (file suffix .A)
-s (Sun audio) 8 kHz, 8 bit ?U-law encoding with audio header (file suffix .au)
-l (linear) 8 kHz, 16 bit signed linear encoding in host byte order with 13
significant bits (file suffix .l)
In absence of options or suffixes to specify a format, ?U-law encoding as forced by
-u is assumed.
PECULIARITIES
A four bit magic number is prefixed to each 32 1/2-byte GSM frame, mainly because
32 1/2-bytes are rather clumsy to handle.
WARNING
The compression algorithm used is a lossy compression algorithm devised especially
for speech; on no account should it be used for text, pictures or any other non-
speech-data you consider valuable.
BUGS
Please direct bug reports to jutta AT cs.de.
SEE ALSO
gsm(3)
local TOAST(1)
Generated by $Id: phpMan.php,v 4.49 2006/02/26 13:18:18 chedong Exp $ Author: Che Dong
On Apache/1.3.37 (Unix) mod_throttle/3.1.2 FrontPage/5.0.2.2635 mod_psoft_traffic/0.2 mod_ssl/2.8.28 OpenSSL/0.9.8b
Under GNU General Public License
2008-12-01 15:27 @38.103.63.55 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)