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CentOS 7.0 - man page for toast (centos section 1)

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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  standard
       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 correla-
	      tion lag during encoding.  (The multiplications that do this are	a  bottleneck  of
	      the  algorithm.)	 The resulting encoding process will not produce 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  multiplication
	      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 suf-
       fix.  Command line options can also specify a format to be used for all files.
       The following formats are supported:

       -u     (uU-law) 8 kHz, 8 bit uU-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 uU-law encoding with audio header (file suffix .au)

       -l     (linear) 8 kHz, 16 bit signed linear encoding in host byte order with  13  signifi-
	      cant bits (file suffix .l)

       In  absence of options or suffixes to specify a format, uU-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@cs.tu-berlin.de.

SEE ALSO
       gsm(3)

					      local					 TOAST(1)


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