SoX(7)                          Sound eXchange                          SoX(7)



NAME
       SoX - Sound eXchange, the Swiss Army knife of audio manipulation

DESCRIPTION
       This  manual  describes  SoX  supported  file  formats and audio device
       types; the SoX manual set starts with sox(1).

       Format types that can SoX can determine by  a  filename  extension  are
       listed  with  their  names  preceded  by  a dot.  Format types that are
       optionally built into SoX are marked `(optional)'.

       Format types that can be handled by an external library via an optional
       pseudo  file  type  (currently  sndfile) are marked e.g. `(also with -t
       sndfile)'.  This might be useful if you have a file that  doesn't  work
       with  SoX's default format readers and writers, and there's an external
       reader or writer for that format.

       To see if SoX has support for an optional format or device,  enter  sox
       -h and look for its name under the list: `AUDIO FILE FORMATS' or `AUDIO
       DEVICE DRIVERS'.

   SOX FORMATS & DEVICE DRIVERS
       .raw (also with -t sndfile), .f32, .f64, .s8, .s16, .s24, .s32,
       .u8, .u16, .u24, .u32, .ul, .al, .lu, .la
              Raw (headerless) audio files.  For raw, the sample rate and  the
              data  encoding  must be given using command-line format options;
              for the other listed types, the sample  rate  defaults  to  8kHz
              (but may be overridden), and the data encoding is defined by the
              given suffix.  Thus f32 and f64 indicate files encoded as 32 and
              64-bit  (IEEE  single  and  double precision) floating point PCM
              respectively; s8, s16, s24, and s32  indicate  8,  16,  24,  and
              32-bit  signed  integer  PCM respectively; u8, u16, u24, and u32
              indicate 8, 16, 24, and  32-bit  unsigned  integer  PCM  respec‐
              tively;  ul  indicates  `μ-law'  (8-bit),  al  indicates `A-law'
              (8-bit), and lu and la are inverse bit order `μ-law' and inverse
              bit order `A-law' respectively.  For all raw formats, the number
              of channels defaults to 1 (but may be overridden).

              Headerless audio files on a SPARC computer are likely to  be  of
              format  ul;  on a Mac, they're likely to be u8 but with a sample
              rate of 11025 or 22050 Hz.

              See .ima and .vox for raw ADPCM formats, and .cdda  for  raw  CD
              digital audio.

       .f4, .f8, .s1, .s2, .s3, .s4,
       .u1, .u2, .u3, .u4, .sb, .sw, .sl, .ub, .uw
              Deprecated aliases for f32, f64, s8, s16, s24, s32,
              u8, u16, u24, u32, s8, s16, s32, u8, and u16 respectively.

       .8svx (also with -t sndfile)
              Amiga 8SVX musical instrument description format.

       .aiff, .aif (also with -t sndfile)
              AIFF  files  as  used on old Apple Macs, Apple IIc/IIgs and SGI.
              SoX's AIFF support does not include multiple  audio  chunks,  or
              the  8SVX musical instrument description format.  AIFF files are
              multimedia archives and can  have  multiple  audio  and  picture
              chunks  -  you  may  need a separate archiver to work with them.
              With Mac OS X, AIFF has been superseded by CAF.

       .aiffc, .aifc (also with -t sndfile)
              AIFF-C is a format based on AIFF that was created to allow  han‐
              dling compressed audio.  It can also handle little endian uncom‐
              pressed linear data that is often referred to as sowt  encoding.
              This  encoding  has  also  become the defacto format produced by
              modern Macs as well as iTunes on  any  platform.   AIFF-C  files
              produced by other applications typically have the file extension
              .aif and require looking at its header to detect the  true  for‐
              mat.  The sowt encoding is the only encoding that SoX can handle
              with this format.

              AIFF-C is defined in DAVIC 1.4 Part 9 Annex B.  This  format  is
              referred from ARIB STD-B24, which is specified for Japanese data
              broadcasting.  Any private chunks are not supported.

       alsa (optional)
              Advanced Linux Sound Architecture device driver;  supports  both
              playing  and  recording audio.  ALSA is only used in Linux-based
              operating systems, though these often support OSS (see below) as
              well.  Examples:
                   sox infile -t alsa
                   sox infile -t alsa default
                   sox infile -t alsa plughw:0,0
                   sox -b 16 -t alsa hw:1 outfile
              See also play(1), rec(1), and sox(1) -d.

       .amb   Ambisonic  B-Format: a specialisation of .wav with between 3 and
              16 channels of audio for use with  an  Ambisonic  decoder.   See
              http://www.ambisonia.com/Members/mleese/file-format-for-b-format
              for details.  It is up to the user to get the channels  together
              in the right order and at the correct amplitude.

       .amr-nb (optional)
              Adaptive  Multi  Rate - Narrow Band speech codec; a lossy format
              used in 3rd generation mobile telephony and defined in  3GPP  TS
              26.071 et al.

              AMR-NB  audio  has  a  fixed sampling rate of 8 kHz and supports
              encoding to the following  bit-rates  (as  selected  by  the  -C
              option):  0  = 4.75 kbit/s, 1 = 5.15 kbit/s, 2 = 5.9 kbit/s, 3 =
              6.7 kbit/s, 4 = 7.4 kbit/s 5 = 7.95 kbit/s, 6 = 10.2 kbit/s, 7 =
              12.2 kbit/s.

       .amr-wb (optional)
              Adaptive  Multi  Rate  -  Wide Band speech codec; a lossy format
              used in 3rd generation mobile telephony and defined in  3GPP  TS
              26.171 et al.

              AMR-WB  audio  has  a fixed sampling rate of 16 kHz and supports
              encoding to the following  bit-rates  (as  selected  by  the  -C
              option):  0 = 6.6 kbit/s, 1 = 8.85 kbit/s, 2 = 12.65 kbit/s, 3 =
              14.25 kbit/s, 4 = 15.85 kbit/s 5  =  18.25  kbit/s,  6  =  19.85
              kbit/s, 7 = 23.05 kbit/s, 8 = 23.85 kbit/s.

       ao (optional)
              Xiph.org's  Audio  Output  device driver; works only for playing
              audio.  It supports a wide range of devices and sound systems  -
              see  its  documentation  for the full range.  For the most part,
              SoX's use of libao cannot be configured directly; instead, libao
              configuration files must be used.

              The  filename  specified is used to determine which libao plugin
              to use.  Normally, you should specify `default' as the filename.
              If  that  doesn't give the desired behavior then you can specify
              the short name for a given plugin (such as pulse for pulse audio
              plugin).  Examples:
                   sox infile -t ao
                   sox infile -t ao default
                   sox infile -t ao pulse
              See also play(1) and sox(1) -d.

       .au, .snd (also with -t sndfile)
              Sun Microsystems AU files.  There are many types of AU file; DEC
              has invented its own with a  different  magic  number  and  byte
              order.   To  write a DEC file, use the -L option with the output
              file options.

              Some .au files are known to have invalid AU headers;  these  are
              probably  original Sun μ-law 8000 Hz files and can be dealt with
              using the .ul format (see below).

              It is possible to override AU file header information  with  the
              -r  and  -c  options,  in which case SoX will issue a warning to
              that effect.

       .avr   Audio Visual Research format; used by  a  number  of  commercial
              packages on the Mac.

       .caf (optional)
              Apple's Core Audio File format.

       .cdda, .cdr
              `Red Book' Compact Disc Digital Audio (raw audio).  CDDA has two
              audio  channels  formatted  as  16-bit  signed   integers   (big
              endian)at  a  sample  rate  of 44.1 kHz.  The number of (stereo)
              samples in each CDDA track is always a multiple of 588.

       coreaudio (optional)
              Mac OSX CoreAudio  device  driver:  supports  both  playing  and
              recording  audio.   If a filename is not specific or if the name
              is "default" then the default audio  device  is  selected.   Any
              other  name will be used to select a specific device.  The valid
              names can be seen in the System Preferences->Sound menu and then
              under the Output and Input tabs.

              Examples:
                   sox infile -t coreaudio
                   sox infile -t coreaudio default
                   sox infile -t coreaudio "Internal Speakers"
              See also play(1), rec(1), and sox(1) -d.

       .cvsd, .cvs
              Continuously Variable Slope Delta modulation.  A headerless for‐
              mat used to compress speech audio for applications such as voice
              mail.  This format is sometimes used with bit-reversed samples -
              the -X format option can be used to set the bit-order.

       .cvu   Continuously Variable Slope Delta modulation (unfiltered).  This
              is an alternative handler for CVSD that is unfiltered but can be
              used with any bit-rate.  E.g.
                   sox infile outfile.cvu rate 28k
                   play -r 28k outfile.cvu sinc -3.4k

       .dat   Text Data files.  These files contain a  textual  representation
              of  the  sample  data.   There is one line at the beginning that
              contains the sample rate, and one line that contains the  number
              of  channels.  Subsequent lines contain two or more numeric data
              intems: the time since the beginning of the first sample and the
              sample value for each channel.

              Values  are normalized so that the maximum and minimum are 1 and
              -1.  This file format can be  used  to  create  data  files  for
              external  programs such as FFT analysers or graph routines.  SoX
              can also convert a file in this format  back  into  one  of  the
              other file formats.

              Example containing only 2 stereo samples of silence:

                  ; Sample Rate 8012
                  ; Channels 2
                              0   0    0
                  0.00012481278   0    0

       .dvms, .vms
              Used  in  Germany  to  compress  speech audio for voice mail.  A
              self-describing variant of cvsd.

       .fap (optional)
              See .paf.

       .flac (optional; also with -t sndfile)
              Xiph.org's Free Lossless Audio CODEC compressed audio.  FLAC  is
              an  open,  patent-free CODEC designed for compressing music.  It
              is similar to MP3 and Ogg Vorbis,  but  lossless,  meaning  that
              audio is compressed in FLAC without any loss in quality.

              SoX  can  read  native FLAC files (.flac) but not Ogg FLAC files
              (.ogg).  [But see .ogg below for information relating to support
              for Ogg Vorbis files.]

              SoX  can write native FLAC files according to a given or default
              compression level.  8 is the default compression level and gives
              the  best  (but  slowest)  compression;  0  gives the least (but
              fastest) compression.  The compression level is  selected  using
              the -C option [see sox(1)] with a whole number from 0 to 8.

       .fssd  An alias for the .u8 format.

       .gsrt  Grandstream  ring-tone  files.  Whilst this file format can con‐
              tain A-Law, μ-law, GSM, G.722,  G.723,  G.726,  G.728,  or  iLBC
              encoded  audio,  SoX supports reading and writing only A-Law and
              μ-law.  E.g.
                 sox music.wav -t gsrt ring.bin
                 play ring.bin

       .gsm (optional; also with -t sndfile)
              GSM 06.10 Lossy Speech Compression.  A  lossy  format  for  com‐
              pressing  speech which is used in the Global Standard for Mobile
              telecommunications (GSM).  It's good for its purpose,  shrinking
              audio  data  size,  but  it  will introduce lots of noise when a
              given audio signal is encoded and decoded multiple times.   This
              format  is  used  by some voice mail applications.  It is rather
              CPU intensive.

       .hcom  Macintosh HCOM files.  These are Mac  FSSD  files  with  Huffman
              compression.

       .htk   Single  channel  16-bit  PCM  format  used by HTK, a toolkit for
              building Hidden Markov Model speech processing tools.

       .ircam (also with -t sndfile)
              Another name for .sf.

       .ima (also with -t sndfile)
              A headerless file of IMA ADPCM  audio  data.  IMA  ADPCM  claims
              16-bit  precision packed into only 4 bits, but in fact sounds no
              better than .vox.

       .lpc, .lpc10
              LPC-10 is a compression  scheme  for  speech  developed  in  the
              United   States.   See   http://www.arl.wustl.edu/~jaf/lpc/  for
              details. There is no associated file format, so SoX's  implemen‐
              tation is headerless.

       .mat, .mat4, .mat5 (optional)
              Matlab 4.2/5.0 (respectively GNU Octave 2.0/2.1) format (.mat is
              the same as .mat4).

       .m3u   A playlist format; contains a list  of  audio  files.   SoX  can
              read,  but  not  write this file format.  See [1] for details of
              this format.

       .maud  An IFF-conforming audio file type, registered by MS  MacroSystem
              Computer  GmbH, published along with the `Toccata' sound-card on
              the Amiga.  Allows 8bit linear, 16bit linear,  A-Law,  μ-law  in
              mono and stereo.

       .mp3, .mp2 (optional read, optional write)
              MP3  compressed  audio;  MP3  (MPEG  Layer  3)  is a part of the
              patent-encumbered MPEG standards for audio  and  video  compres‐
              sion.   It is a lossy compression format that achieves good com‐
              pression rates with little quality loss.

              Because MP3 is patented, SoX cannot be distributed with MP3 sup‐
              port  without  incurring  the  patent  holder's fees.  Users who
              require SoX with MP3 support must currently  compile  and  build
              SoX with the MP3 libraries (LAME & MAD) from source code, or, in
              some cases, obtain pre-built dynamically loadable libraries.

              When reading MP3 files, up to 28 bits  of  precision  is  stored
              although  only  16  bits  is reported to user.  This is to allow
              default behavior of writing 16 bit output  files.   A  user  can
              specify  a higher precision for the output file to prevent loss‐
              ing this extra information.  MP3 output files will use up to  24
              bits of precision while encoding.

              MP3 compression parameters can be selected using SoX's -C option
              as follows (note that the current syntax is subject to change):

              The primary parameter to the LAME encoder is the  bit  rate.  If
              the  value  of the -C value is a positive integer, it's taken as
              the bitrate in kbps (e.g. if you specify 128, it uses 128 kbps).

              The  second  most  important  parameter  is  probably  "quality"
              (really  performance), which allows balancing encoding speed vs.
              quality.  In LAME, 0 specifies highest quality but is very slow,
              while 9 selects poor quality, but is fast. (5 is the default and
              2 is recommended as a good trade-off for high quality encodes.)

              Because the -C value is a float, the fractional part is used  to
              select  quality.  128.2 selects 128 kbps encoding with a quality
              of 2. There is one problem with this approach. We  need  128  to
              specify  128  kbps encoding with default quality, so 0 means use
              default. Instead of 0 you have to use .01 (or  .99)  to  specify
              the highest quality (128.01 or 128.99).

              LAME  uses  bitrate  to  specify  a constant bitrate, but higher
              quality can be achieved using Variable Bit Rate (VBR). VBR qual‐
              ity  (really size) is selected using a number from 0 to 9. Use a
              value of 0 for high quality, larger files,  and  9  for  smaller
              files of lower quality. 4 is the default.

              In  order  to squeeze the selection of VBR into the the -C value
              float we use negative numbers to select VRR. -4.2  would  select
              default  VBR encoding (size) with high quality (speed). One spe‐
              cial case is 0, which is a valid VBR encoding parameter but  not
              a  valid bitrate.  Compression value of 0 is always treated as a
              high quality vbr, as a result both -0.2 and 0.2 are  treated  as
              highest quality VBR (size) and high quality (speed).

              See also Ogg Vorbis for a similar format.

       .nist (also with -t sndfile)
              See .sph.

       .ogg, .vorbis (optional)
              Xiph.org's  Ogg  Vorbis  compressed  audio; an open, patent-free
              CODEC designed for music and streaming audio.   It  is  a  lossy
              compression  format  (similar  to  MP3, VQF & AAC) that achieves
              good compression rates with a minimum amount of quality loss.

              SoX can decode all types of Ogg Vorbis files, and can encode  at
              different compression levels/qualities given as a number from -1
              (highest compression/lowest quality) to 10 (lowest  compression,
              highest  quality).   By  default the encoding quality level is 3
              (which gives an encoded rate of approx. 112kbps), but  this  can
              be changed using the -C option (see above) with a number from -1
              to 10; fractional numbers (e.g.  3.6) are also allowed.   Decod‐
              ing  is  somewhat  CPU intensive and encoding is very CPU inten‐
              sive.

              See also .mp3 for a similar format.

       .opus (optional)
              Xiph.org's Opus compressed audio; an  open,  lossy,  low-latency
              codec  offering  a  wide range of compression rates. It uses the
              Ogg container.

              SoX can only read Opus files, not write them.

       oss (optional)
              Open Sound System /dev/dsp device driver; supports both  playing
              and  recording  audio.   OSS  support  is available in Unix-like
              operating systems, sometimes  together  with  alternative  sound
              systems (such as ALSA).  Examples:
                   sox infile -t oss
                   sox infile -t oss /dev/dsp
                   sox -b 16 -t oss /dev/dsp outfile
              See also play(1), rec(1), and sox(1) -d.

       .paf, .fap (optional)
              Ensoniq PARIS file format (big and little-endian respectively).

       .pls   A  playlist  format;  contains  a  list of audio files.  SoX can
              read, but not write this file format.  See [2]  for  details  of
              this format.

              Note:  SoX  support  for  SHOUTcast PLS relies on wget(1) and is
              only partially supported: it's necessary to  specify  the  audio
              type manually, e.g.
                   play -t mp3 "http://a.server/pls?rn=265&file=filename.pls"
              and  SoX  does  not  know about alternative servers - hit Ctrl-C
              twice in quick succession to quit.

       .prc   Psion Record. Used in Psion EPOC PDAs (Series 5, Revo and  simi‐
              lar)  for  System  alarms  and  recordings  made by the built-in
              Record application.  When writing, SoX defaults to A-law,  which
              is recommended; if you must use ADPCM, then use the -e ima-adpcm
              switch. The sound quality is poor because Psion Record seems  to
              insist  on  frames  of  800  samples or fewer, so that the ADPCM
              CODEC has to be reset at every  800  frames,  which  causes  the
              sound to glitch every tenth of a second.

       pulseaudio (optional)
              PulseAudio driver; supports both playing and recording of audio.
              PulseAudio is a cross platform networked  sound  server.   If  a
              file  name  is specified with this driver, it is ignored.  Exam‐
              ples:
                   sox infile -t pulseaudio
                   sox infile -t pulseaudio default
              See also play(1), rec(1), and sox(1) -d.

       .pvf (optional)
              Portable Voice Format.

       .sd2 (optional)
              Sound Designer 2 format.

       .sds (optional)
              MIDI Sample Dump Standard.

       .sf (also with -t sndfile)
              IRCAM  SDIF  (Institut  de  Recherche  et  Coordination   Acous‐
              tique/Musique  Sound  Description  Interchange  Format). Used by
              academic music software such as  the  CSound  package,  and  the
              MixView sound sample editor.

       .sln   Asterisk  PBX  `signed linear' 8khz, 16-bit signed integer, lit‐
              tle-endian raw format.

       .sph, .nist (also with -t sndfile)
              SPHERE (SPeech HEader Resources) is a  file  format  defined  by
              NIST  (National  Institute  of  Standards and Technology) and is
              used with speech audio.  SoX can read these files when they con‐
              tain  μ-law and PCM data.  It will ignore any header information
              that says the data is compressed using shorten  compression  and
              will treat the data as either μ-law or PCM.  This will allow SoX
              and the command line shorten program to be  run  together  using
              pipes  to  encompasses  the data and then pass the result to SoX
              for processing.

       .smp   Turtle Beach SampleVision files.  SMP files are for use with the
              PC-DOS  package  SampleVision  by  Turtle Beach Softworks.  This
              package is for communication to several MIDI samplers.  All sam‐
              ple  rates  are  supported  by the package, although not all are
              supported by the samplers themselves.  Currently loop points are
              ignored.

       .snd   See .au, .sndr and .sndt.

       sndfile (optional)
              This  is  a  pseudo-type  that forces libsndfile to be used. For
              writing files, the actual file type is then taken from the  out‐
              put file name; for reading them, it is deduced from the file.

       sndio (optional)
              OpenBSD audio device driver; supports both playing and recording
              audio.
                   sox infile -t sndio
              See also play(1), rec(1), and sox(1) -d.

       .sndr  Sounder files.  An MS-DOS/Windows format from  the  early  '90s.
              Sounder files usually have the extension `.SND'.

       .sndt  SoundTool  files.  An MS-DOS/Windows format from the early '90s.
              SoundTool files usually have the extension `.SND'.

       .sou   An alias for the .u8 raw format.

       .sox   SoX's native uncompressed PCM format, intended for  storing  (or
              piping)  audio  at  intermediate processing points (i.e. between
              SoX invocations).  It has much in common with the  popular  WAV,
              AIFF,  and  AU  uncompressed  PCM formats, but has the following
              specific characteristics: the PCM samples are always  stored  as
              32  bit  signed integers, the samples are stored (by default) as
              `native endian', and the  number  of  samples  in  the  file  is
              recorded as a 64-bit integer.  Comments are also supported.

              See `Special Filenames' in sox(1) for examples of using the .sox
              format with `pipes'.

       sunau (optional)
              Sun /dev/audio device driver; supports both playing and  record‐
              ing audio.  For example:
                   sox infile -t sunau /dev/audio
              or
                   sox infile -t sunau -e mu-law -c 1 /dev/audio
              for older sun equipment.

              See also play(1), rec(1), and sox(1) -d.

       .txw   Yamaha  TX-16W  sampler.   A  file format from a Yamaha sampling
              keyboard which wrote IBM-PC format 3.5" floppies.  Handles read‐
              ing  of files which do not have the sample rate field set to one
              of  the  expected  by  looking  at  some  other  bytes  in   the
              attack/loop  length fields, and defaulting to 33 kHz if the sam‐
              ple rate is still unknown.

       .vms   See .dvms.

       .voc (also with -t sndfile)
              Sound Blaster VOC files.  VOC files are multi-part  and  contain
              silence parts, looping, and different sample rates for different
              chunks.  On input, the silence parts are filled out,  loops  are
              rejected,  and  sample  data with a new sample rate is rejected.
              Silence with a different sample rate is generated appropriately.
              On  output,  silence  is not detected, nor are impossible sample
              rates.  SoX supports reading (but not writing)  VOC  files  with
              multiple   blocks,   and  files  containing  μ-law,  A-law,  and
              2/3/4-bit ADPCM samples.

       .vorbis
              See .ogg.

       .vox (also with -t sndfile)
              A headerless file of  Dialogic/OKI  ADPCM  audio  data  commonly
              comes  with the extension .vox.  This ADPCM data has 12-bit pre‐
              cision packed into only 4-bits.

              Note: some early Dialogic hardware does  not  always  reset  the
              ADPCM encoder at the start of each vox file.  This can result in
              clipping and/or DC offset problems when it comes to decoding the
              audio.   Whilst little can be done about the clipping, a DC off‐
              set can be removed by passing the decoded audio through a  high-
              pass filter, e.g.:
                   sox input.vox output.wav highpass 10

       .w64 (optional)
              Sonic Foundry's 64-bit RIFF/WAV format.

       .wav (also with -t sndfile)
              Microsoft .WAV RIFF files.  This is the native audio file format
              of Windows, and widely used for uncompressed audio.

              Normally .wav files have all  formatting  information  in  their
              headers,  and so do not need any format options specified for an
              input file.  If any are, they will override the file header, and
              you will be warned to this effect.  You had better know what you
              are doing! Output format options will cause a format conversion,
              and the .wav will written appropriately.

              SoX can read and write linear PCM, floating point, μ-law, A-law,
              MS ADPCM, and IMA (or DVI) ADPCM encoded samples.  WAV files can
              also  contain  audio  encoded  in many other ways (not currently
              supported with SoX) e.g. MP3; in some  cases  such  a  file  can
              still be read by SoX by overriding the file type, e.g.
                 play -t mp3 mp3-encoded.wav
              Big  endian  versions  of RIFF files, called RIFX, are also sup‐
              ported.  To write a RIFX file, use the -B option with the output
              file options.

       waveaudio (optional)
              MS-Windows native audio device driver.  Examples:
                   sox infile -t waveaudio
                   sox infile -t waveaudio default
                   sox infile -t waveaudio 1
                   sox infile -t waveaudio "High Definition Audio Device ("
              If  the device name is omitted, -1, or default, then you get the
              `Microsoft Wave Mapper' device.  Wave Mapper means `use the sys‐
              tem  default  audio  devices'.   You  can control what `default'
              means via the OS Control Panel.

              If the device name given is some  other  number,  you  get  that
              audio device by index; so recording with device name 0 would get
              the first input device (perhaps the microphone), 1 would get the
              second  (perhaps  line  in), etc.  Playback using 0 will get the
              first output device (usually the only audio device).

              If the device name given is something other than a  number,  SoX
              tries  to  match it (maximum 31 characters) against the names of
              the available devices.

              See also play(1), rec(1), and sox(1) -d.

       .wavpcm
              A non-standard, but widely used, variant of .wav.  Some applica‐
              tions  cannot  read  a  standard WAV file header for PCM-encoded
              data with sample-size greater than 16-bits or with more than two
              channels,  but can read a non-standard WAV header.  It is likely
              that such applications will eventually be updated to support the
              standard  header,  but  in the mean time, this SoX format can be
              used to create files with the non-standard  header  that  should
              work with these applications.  (Note that SoX will automatically
              detect and read WAV files with the non-standard header.)

              The most common use of this file-type is likely to be along  the
              following lines:
                   sox infile.any -t wavpcm -e signed-integer outfile.wav

       .wv (optional)
              WavPack  lossless audio compression.  Note that, when converting
              .wav to this format and back again, the RIFF header is not  nec‐
              essarily preserved losslessly (though the audio is).

       .wve (also with -t sndfile)
              Psion  8-bit A-law.  Used on Psion SIBO PDAs (Series 3 and simi‐
              lar).  This format is deprecated in SoX, but will continue to be
              used in libsndfile.

       .xa    Maxis  XA  files.   These  are  16-bit ADPCM audio files used by
              Maxis games.  Writing .xa  files  is  currently  not  supported,
              although adding write support should not be very difficult.

       .xi (optional)
              Fasttracker 2 Extended Instrument format.

SEE ALSO
       sox(1), soxi(1), libsox(3), octave(1), wget(1)

       The SoX web page at http://sox.sourceforge.net
       SoX scripting examples at http://sox.sourceforge.net/Docs/Scripts

   References
       [1]    Wikipedia, M3U, http://en.wikipedia.org/wiki/M3U

       [2]    Wikipedia, PLS, http://en.wikipedia.org/wiki/PLS_(file_format)

LICENSE
       Copyright 1998-2013 Chris Bagwell and SoX Contributors.
       Copyright 1991 Lance Norskog and Sundry Contributors.

AUTHORS
       Chris Bagwell (cbagwell@users.sourceforge.net).  Other authors and con‐
       tributors are listed in the ChangeLog file that is distributed with the
       source code.



soxformat                      December 31, 2014                        SoX(7)
