1SoX(7) Sound eXchange SoX(7)
2
6 SoX - Sound eXchange, the Swiss Army knife of audio manipulation
7
9 This manual describes SoX supported file formats and audio device
10 types; the SoX manual set starts with sox(1).
11 Format types that can SoX can determine by a filename extension are
13 listed with their names preceded by a dot. Format types that are
14 optionally built into SoX are marked `(optional)'.
15 Format types that can be handled by an external library via an optional
17 pseudo file type (currently sndfile or ffmpeg) are marked e.g. `(also
18 with -t sndfile)'. This might be useful if you have a file that
19 doesn't work with SoX's default format readers and writers, and there's
20 an external reader or writer for that format.
21 To see if SoX has support for an optional format or device, enter sox
23 -h and look for its name under the list: `AUDIO FILE FORMATS' or `AUDIO
24 DEVICE DRIVERS'.
25 SOX FORMATS & DEVICE DRIVERS
27 .raw (also with -t sndfile), .f32, .f64, .s8, .s16, .s24, .s32,
28 .u8, .u16, .u24, .u32, .ul, .al, .lu, .la
29 Raw (headerless) audio files. For raw, the sample rate and the
30 data encoding must be given using command-line format options;
31 for the other listed types, the sample rate defaults to 8kHz
32 (but may be overridden), and the data encoding is defined by the
33 given suffix. Thus f32 and f64 indicate files encoded as 32 and
34 64-bit (IEEE single and double precision) floating point PCM
35 respectively; s8, s16, s24, and s32 indicate 8, 16, 24, and
36 32-bit signed integer PCM respectively; u8, u16, u24, and u32
37 indicate 8, 16, 24, and 32-bit unsigned integer PCM respec‐
38 tively; ul indicates `μ-law' (8-bit), al indicates `A-law'
39 (8-bit), and lu and la are inverse bit order `μ-law' and inverse
40 bit order `A-law' respectively. For all raw formats, the number
41 of channels defaults to 1 (but may be overridden).
42 Headerless audio files on a SPARC computer are likely to be of
44 format ul; on a Mac, they're likely to be u8 but with a sample
45 rate of 11025 or 22050 Hz.
46 See .ima and .vox for raw ADPCM formats, and .cdda for raw CD
48 digital audio.
49 .f4, .f8, .s1, .s2, .s3, .s4,
51 .u1, .u2, .u3, .u4, .sb, .sw, .sl, .ub, .uw
52 Deprecated aliases for f32, f64, s8, s16, s24, s32,
53 u8, u16, u24, u32, s8, s16, s32, u8, and u16 respectively.
54 .8svx (also with -t sndfile)
56 Amiga 8SVX musical instrument description format.
57 .aiff, .aif (also with -t sndfile)
59 AIFF files as used on old Apple Macs, Apple IIc/IIgs and SGI.
60 SoX's AIFF support does not include multiple audio chunks, or
61 the 8SVX musical instrument description format. AIFF files are
62 multimedia archives and can have multiple audio and picture
63 chunks - you may need a separate archiver to work with them.
64 With Mac OS X, AIFF has been superseded by CAF.
65 .aiffc, .aifc (also with -t sndfile)
67 AIFF-C is a format based on AIFF that was created to allow han‐
68 dling compressed audio. It can also handle little endian uncom‐
69 pressed linear data that is often referred to as sowt encoding.
70 This encoding has also become the defacto format produced by
71 modern Macs as well as iTunes on any platform. AIFF-C files
72 produced by other applications typically have the file extension
73 .aif and require looking at its header to detect the true for‐
74 mat. The sowt encoding is the only encoding that SoX can handle
75 with this format.
76 AIFF-C is defined in DAVIC 1.4 Part 9 Annex B. This format is
78 referred from ARIB STD-B24, which is specified for Japanese data
79 broadcasting. Any private chunks are not supported.
80 alsa (optional)
82 Advanced Linux Sound Architecture device driver; supports both
83 playing and recording audio. ALSA is only used in Linux-based
84 operating systems, though these often support OSS (see below) as
85 well. Examples:
86 sox infile -t alsa
87 sox infile -t alsa default
88 sox infile -t alsa plughw:0,0
89 sox -2 -t alsa hw:1 outfile
90 See also play(1), rec(1), and sox(1) -d.
91 .amb Ambisonic B-Format: a specialisation of .wav with between 3 and
93 16 channels of audio for use with an Ambisonic decoder. See
94 http://www.ambisonia.com/Members/mleese/file-format-for-b-format
95 for details. It is up to the user to get the channels together
96 in the right order and at the correct amplitude.
97 .amr-nb (optional)
99 Adaptive Multi Rate - Narrow Band speech codec; a lossy format
100 used in 3rd generation mobile telephony and defined in 3GPP TS
101 26.071 et al.
102 AMR-NB audio has a fixed sampling rate of 8 kHz and supports
104 encoding to the following bit-rates (as selected by the -C
105 option): 0 = 4.75 kbit/s, 1 = 5.15 kbit/s, 2 = 5.9 kbit/s, 3 =
106 6.7 kbit/s, 4 = 7.4 kbit/s 5 = 7.95 kbit/s, 6 = 10.2 kbit/s, 7 =
107 12.2 kbit/s.
108 .amr-wb (optional)
110 Adaptive Multi Rate - Wide Band speech codec; a lossy format
111 used in 3rd generation mobile telephony and defined in 3GPP TS
112 26.171 et al.
113 AMR-WB audio has a fixed sampling rate of 16 kHz and supports
115 encoding to the following bit-rates (as selected by the -C
116 option): 0 = 6.6 kbit/s, 1 = 8.85 kbit/s, 2 = 12.65 kbit/s, 3 =
117 14.25 kbit/s, 4 = 15.85 kbit/s 5 = 18.25 kbit/s, 6 = 19.85
118 kbit/s, 7 = 23.05 kbit/s, 8 = 23.85 kbit/s.
119 ao (optional)
121 Xiph.org's Audio Output device driver; works only for playing
122 audio. It supports a wide range of devices and sound systems -
123 see its documentation for the full range. For the most part,
124 SoX's use of libao cannot be configured directly; instead, libao
125 configuration files must be used.
126 The filename specified is used to determine which libao plugin
128 to use. Normally, you should specify `default' as the filename.
129 If that doesn't give the desired behavior then you can specify
130 the short name for a given plugin (such as pulse for pulse audio
131 plugin). Examples:
132 sox infile -t ao
133 sox infile -t ao default
134 sox infile -t ao pulse
135 See also play(1) and sox(1) -d.
136 .au, .snd (also with -t sndfile)
138 Sun Microsystems AU files. There are many types of AU file; DEC
139 has invented its own with a different magic number and byte
140 order. To write a DEC file, use the -L option with the output
141 file options.
142 Some .au files are known to have invalid AU headers; these are
144 probably original Sun μ-law 8000 Hz files and can be dealt with
145 using the .ul format (see below).
146 It is possible to override AU file header information with the
148 -r and -c options, in which case SoX will issue a warning to
149 that effect.
150 .avr Audio Visual Research format; used by a number of commercial
152 packages on the Mac.
153 .caf (optional)
155 Apple's Core Audio File format.
156 .cdda, .cdr
158 `Red Book' Compact Disc Digital Audio (raw audio). CDDA has two
159 audio channels formatted as 16-bit signed integers (big
160 endian)at a sample rate of 44.1 kHz. The number of (stereo)
161 samples in each CDDA track is always a multiple of 588.
162 coreaudio (optional)
164 Mac OSX CoreAudio device driver: supports both playing and
165 recording audio. If a filename is not specific or if the name
166 is "default" then the default audio device is selected. Any
167 other name will be used to select a specific device. The valid
168 names can be seen in the System Preferences->Sound menu and then
169 under the Output and Input tabs.
170 Examples:
172 sox infile -t coreaudio
173 sox infile -t coreaudio default
174 sox infile -t coreaudio "Internal Speakers"
175 See also play(1), rec(1), and sox(1) -d.
176 .cvsd, .cvs
178 Continuously Variable Slope Delta modulation. A headerless for‐
179 mat used to compress speech audio for applications such as voice
180 mail. This format is sometimes used with bit-reversed samples -
181 the -X format option can be used to set the bit-order.
182 .cvu Continuously Variable Slope Delta modulation (unfiltered). This
184 is an alternative handler for CVSD that is unfiltered but can be
185 used with any bit-rate. E.g.
186 sox infile outfile.cvu rate 28k
187 play -r 28k outfile.cvu sinc -3.4k
188 .dat Text Data files. These files contain a textual representation
190 of the sample data. There is one line at the beginning that
191 contains the sample rate, and one line that contains the number
192 of channels. Subsequent lines contain two or more numeric data
193 intems: the time since the beginning of the first sample and the
194 sample value for each channel.
195 Values are normalized so that the maximum and minimum are 1 and
197 -1. This file format can be used to create data files for
198 external programs such as FFT analysers or graph routines. SoX
199 can also convert a file in this format back into one of the
200 other file formats.
201 Example containing only 2 stereo samples of silence:
203 ; Sample Rate 8012
205 ; Channels 2
206 0 0 0
207 0.00012481278 0 0
208 .dvms, .vms
210 Used in Germany to compress speech audio for voice mail. A
211 self-describing variant of cvsd.
212 .fap (optional)
214 See .paf.
215 ffmpeg (optional)
217 This is a pseudo-type that forces ffmpeg to be used. The actual
218 file type is deduced from the file name (it cannot be used on
219 stdio). It can read a wide range of audio files, not all of
220 which are documented here, and also the audio track of many
221 video files (including AVI, WMV and MPEG). At present only the
222 first audio track of a file can be read.
223 .flac (optional; also with -t sndfile)
225 Xiph.org's Free Lossless Audio CODEC compressed audio. FLAC is
226 an open, patent-free CODEC designed for compressing music. It
227 is similar to MP3 and Ogg Vorbis, but lossless, meaning that
228 audio is compressed in FLAC without any loss in quality.
229 SoX can read native FLAC files (.flac) but not Ogg FLAC files
231 (.ogg). [But see .ogg below for information relating to support
232 for Ogg Vorbis files.]
233 SoX can write native FLAC files according to a given or default
235 compression level. 8 is the default compression level and gives
236 the best (but slowest) compression; 0 gives the least (but
237 fastest) compression. The compression level is selected using
238 the -C option [see sox(1)] with a whole number from 0 to 8.
239 .fssd An alias for the .u8 format.
241 .gsrt Grandstream ring-tone files. Whilst this file format can con‐
243 tain A-Law, μ-law, GSM, G.722, G.723, G.726, G.728, or iLBC
244 encoded audio, SoX supports reading and writing only A-Law and
245 μ-law. E.g.
246 sox music.wav -t gsrt ring.bin
247 play ring.bin
248 .gsm (optional; also with -t sndfile)
250 GSM 06.10 Lossy Speech Compression. A lossy format for com‐
251 pressing speech which is used in the Global Standard for Mobile
252 telecommunications (GSM). It's good for its purpose, shrinking
253 audio data size, but it will introduce lots of noise when a
254 given audio signal is encoded and decoded multiple times. This
255 format is used by some voice mail applications. It is rather
256 CPU intensive.
257 .hcom Macintosh HCOM files. These are Mac FSSD files with Huffman
259 compression.
260 .htk Single channel 16-bit PCM format used by HTK, a toolkit for
262 building Hidden Markov Model speech processing tools.
263 .ircam (also with -t sndfile)
265 Another name for .sf.
266 .ima (also with -t sndfile)
268 A headerless file of IMA ADPCM audio data. IMA ADPCM claims
269 16-bit precision packed into only 4 bits, but in fact sounds no
270 better than .vox.
271 .lpc, .lpc10
273 LPC-10 is a compression scheme for speech developed in the
274 United States. See http://www.arl.wustl.edu/~jaf/lpc/ for
275 details. There is no associated file format, so SoX's implemen‐
276 tation is headerless.
277 .mat, .mat4, .mat5 (optional)
279 Matlab 4.2/5.0 (respectively GNU Octave 2.0/2.1) format (.mat is
280 the same as .mat4).
281 .m3u A playlist format; contains a list of audio files. SoX can
283 read, but not write this file format. See [1] for details of
284 this format.
285 .maud An IFF-conforming audio file type, registered by MS MacroSystem
287 Computer GmbH, published along with the `Toccata' sound-card on
288 the Amiga. Allows 8bit linear, 16bit linear, A-Law, μ-law in
289 mono and stereo.
290 .mp3, .mp2 (optional read, optional write)
292 MP3 compressed audio; MP3 (MPEG Layer 3) is a part of the
293 patent-encumbered MPEG standards for audio and video compres‐
294 sion. It is a lossy compression format that achieves good com‐
295 pression rates with little quality loss.
296 Because MP3 is patented, SoX cannot be distributed with MP3 sup‐
298 port without incurring the patent holder's fees. Users who
299 require SoX with MP3 support must currently compile and build
300 SoX with the MP3 libraries (LAME & MAD) from source code, or, in
301 some cases, obtain pre-built dynamically loadable libraries.
302 When reading MP3 files, up to 28 bits of precision is stored
304 although only 16 bits is reported to user. This is to allow
305 default behavior of writing 16 bit output files. A user can
306 specify a higher precision for the output file to prevent loss‐
307 ing this extra information. MP3 output files will use up to 24
308 bits of precision while encoding.
309 MP3 compression parameters can be selected using SoX's -C option
311 as follows (note that the current syntax is subject to change):
312 The primary parameter to the LAME encoder is the bit rate. If
314 the value of the -C value is a positive integer, it's taken as
315 the bitrate in kbps (e.g. if you specify 128, it uses 128 kbps).
316 The second most important parameter is probably "quality"
318 (really performance), which allows balancing encoding speed vs.
319 quality. In LAME, 0 specifies highest quality but is very slow,
320 while 9 selects poor quality, but is fast. (5 is the default and
321 2 is recommended as a good trade-off for high quality encodes.)
322 Because the -C value is a float, the fractional part is used to
324 select quality. 128.2 selects 128 kbps encoding with a quality
325 of 2. There is one problem with this approach. We need 128 to
326 specify 128 kbps encoding with default quality, so 0 means use
327 default. Instead of 0 you have to use .01 (or .99) to specify
328 the highest quality (128.01 or 128.99).
329 LAME uses bitrate to specify a constant bitrate, but higher
331 quality can be achieved using Variable Bit Rate (VBR). VBR qual‐
332 ity (really size) is selected using a number from 0 to 9. Use a
333 value of 0 for high quality, larger files, and 9 for smaller
334 files of lower quality. 4 is the default.
335 In order to squeeze the selection of VBR into the the -C value
337 float we use negative numbers to select VRR. -4.2 would select
338 default VBR encoding (size) with high quality (speed). One spe‐
339 cial case is 0, which is a valid VBR encoding parameter but not
340 a valid bitrate. Compression value of 0 is always treated as a
341 high quality vbr, as a result both -0.2 and 0.2 are treated as
342 highest quality VBR (size) and high quality (speed).
343 See also Ogg Vorbis for a similar format.
345 .mp4, .m4a (optional)
347 MP4 compressed audio. MP3 (MPEG 4) is part of the MPEG stan‐
348 dards for audio and video compression. See mp3 for more infor‐
349 mation.
350 .nist (also with -t sndfile)
352 See .sph.
353 .ogg, .vorbis (optional)
355 Xiph.org's Ogg Vorbis compressed audio; an open, patent-free
356 CODEC designed for music and streaming audio. It is a lossy
357 compression format (similar to MP3, VQF & AAC) that achieves
358 good compression rates with a minimum amount of quality loss.
359 SoX can decode all types of Ogg Vorbis files, and can encode at
361 different compression levels/qualities given as a number from -1
362 (highest compression/lowest quality) to 10 (lowest compression,
363 highest quality). By default the encoding quality level is 3
364 (which gives an encoded rate of approx. 112kbps), but this can
365 be changed using the -C option (see above) with a number from -1
366 to 10; fractional numbers (e.g. 3.6) are also allowed. Decod‐
367 ing is somewhat CPU intensive and encoding is very CPU inten‐
368 sive.
369 See also .mp3 for a similar format.
371 oss (optional)
373 Open Sound System /dev/dsp device driver; supports both playing
374 and recording audio. OSS support is available in Unix-like
375 operating systems, sometimes together with alternative sound
376 systems (such as ALSA). Examples:
377 sox infile -t oss
378 sox infile -t oss /dev/dsp
379 sox -2 -t oss /dev/dsp outfile
380 See also play(1), rec(1), and sox(1) -d.
381 .paf, .fap (optional)
383 Ensoniq PARIS file format (big and little-endian respectively).
384 .pls A playlist format; contains a list of audio files. SoX can
386 read, but not write this file format. See [2] for details of
387 this format.
388 Note: SoX support for SHOUTcast PLS relies on wget(1) and is
390 only partially supported: it's necessary to specify the audio
391 type manually, e.g.
392 play -t mp3 "http://a.server/pls?rn=265&file=filename.pls"
393 and SoX does not know about alternative servers - hit Ctrl-C
394 twice in quick succession to quit.
395 .prc Psion Record. Used in Psion EPOC PDAs (Series 5, Revo and simi‐
397 lar) for System alarms and recordings made by the built-in
398 Record application. When writing, SoX defaults to A-law, which
399 is recommended; if you must use ADPCM, then use the -i switch.
400 The sound quality is poor because Psion Record seems to insist
401 on frames of 800 samples or fewer, so that the ADPCM CODEC has
402 to be reset at every 800 frames, which causes the sound to
403 glitch every tenth of a second.
404 pulseaudio (optional)
406 PulseAudio driver; supports both playing and recording of audio.
407 PulseAudio is a cross platform networked sound server. If a
408 file name is specified with this driver, it is ignored. Exam‐
409 ples:
410 sox infile -t pulseaudio
411 sox infile -t pulseaudio default
412 See also play(1), rec(1), and sox(1) -d.
413 .pvf (optional)
415 Portable Voice Format.
416 .sd2 (optional)
418 Sound Designer 2 format.
419 .sds (optional)
421 MIDI Sample Dump Standard.
422 .sf (also with -t sndfile)
424 IRCAM SDIF (Institut de Recherche et Coordination Acous‐
425 tique/Musique Sound Description Interchange Format). Used by
426 academic music software such as the CSound package, and the
427 MixView sound sample editor.
428 .sln Asterisk PBX `signed linear' 8khz, 16-bit signed integer, lit‐
430 tle-endian raw format.
431 .sph, .nist (also with -t sndfile)
433 SPHERE (SPeech HEader Resources) is a file format defined by
434 NIST (National Institute of Standards and Technology) and is
435 used with speech audio. SoX can read these files when they con‐
436 tain μ-law and PCM data. It will ignore any header information
437 that says the data is compressed using shorten compression and
438 will treat the data as either μ-law or PCM. This will allow SoX
439 and the command line shorten program to be run together using
440 pipes to encompasses the data and then pass the result to SoX
441 for processing.
442 .smp Turtle Beach SampleVision files. SMP files are for use with the
444 PC-DOS package SampleVision by Turtle Beach Softworks. This
445 package is for communication to several MIDI samplers. All sam‐
446 ple rates are supported by the package, although not all are
447 supported by the samplers themselves. Currently loop points are
448 ignored.
449 .snd See .au, .sndr and .sndt.
451 sndfile (optional)
453 This is a pseudo-type that forces libsndfile to be used. For
454 writing files, the actual file type is then taken from the out‐
455 put file name; for reading them, it is deduced from the file.
456 sndio (optional)
458 OpenBSD audio device driver; supports both playing and recording
459 audio.
460 sox infile -t sndio
461 See also play(1), rec(1), and sox(1) -d.
462 .sndr Sounder files. An MS-DOS/Windows format from the early '90s.
464 Sounder files usually have the extension `.SND'.
465 .sndt SoundTool files. An MS-DOS/Windows format from the early '90s.
467 SoundTool files usually have the extension `.SND'.
468 .sou An alias for the .u8 raw format.
470 .sox SoX's native uncompressed PCM format, intended for storing (or
472 piping) audio at intermediate processing points (i.e. between
473 SoX invocations). It has much in common with the popular WAV,
474 AIFF, and AU uncompressed PCM formats, but has the following
475 specific characteristics: the PCM samples are always stored as
476 32 bit signed integers, the samples are stored (by default) as
477 `native endian', and the number of samples in the file is
478 recorded as a 64-bit integer. Comments are also supported.
479 See `Special Filenames' in sox(1) for examples of using the .sox
481 format with `pipes'.
482 sunau (optional)
484 Sun /dev/audio device driver; supports both playing and record‐
485 ing audio. For example:
486 sox infile -t sunau /dev/audio
487 or
488 sox infile -t sunau -U -c 1 /dev/audio
489 for older sun equipment.
490 See also play(1), rec(1), and sox(1) -d.
492 .txw Yamaha TX-16W sampler. A file format from a Yamaha sampling
494 keyboard which wrote IBM-PC format 3.5" floppies. Handles read‐
495 ing of files which do not have the sample rate field set to one
496 of the expected by looking at some other bytes in the
497 attack/loop length fields, and defaulting to 33 kHz if the sam‐
498 ple rate is still unknown.
499 .vms See .dvms.
501 .voc (also with -t sndfile)
503 Sound Blaster VOC files. VOC files are multi-part and contain
504 silence parts, looping, and different sample rates for different
505 chunks. On input, the silence parts are filled out, loops are
506 rejected, and sample data with a new sample rate is rejected.
507 Silence with a different sample rate is generated appropriately.
508 On output, silence is not detected, nor are impossible sample
509 rates. SoX supports reading (but not writing) VOC files with
510 multiple blocks, and files containing μ-law, A-law, and
511 2/3/4-bit ADPCM samples.
512 .vorbis
514 See .ogg.
515 .vox (also with -t sndfile)
517 A headerless file of Dialogic/OKI ADPCM audio data commonly
518 comes with the extension .vox. This ADPCM data has 12-bit pre‐
519 cision packed into only 4-bits.
520 Note: some early Dialogic hardware does not always reset the
522 ADPCM encoder at the start of each vox file. This can result in
523 clipping and/or DC offset problems when it comes to decoding the
524 audio. Whilst little can be done about the clipping, a DC off‐
525 set can be removed by passing the decoded audio through a high-
526 pass filter, e.g.:
527 sox input.vox output.wav highpass 10
528 .w64 (optional)
530 Sonic Foundry's 64-bit RIFF/WAV format.
531 .wav (also with -t sndfile)
533 Microsoft .WAV RIFF files. This is the native audio file format
534 of Windows, and widely used for uncompressed audio.
535 Normally .wav files have all formatting information in their
537 headers, and so do not need any format options specified for an
538 input file. If any are, they will override the file header, and
539 you will be warned to this effect. You had better know what you
540 are doing! Output format options will cause a format conversion,
541 and the .wav will written appropriately.
542 SoX can read and write linear PCM, floating point, μ-law, A-law,
544 MS ADPCM, and IMA (or DVI) ADPCM encoded samples. WAV files can
545 also contain audio encoded in many other ways (not currently
546 supported with SoX) e.g. MP3; in some cases such a file can
547 still be read by SoX by overriding the file type, e.g.
548 play -t mp3 mp3-encoded.wav
549 Big endian versions of RIFF files, called RIFX, are also sup‐
550 ported. To write a RIFX file, use the -B option with the output
551 file options.
552 waveaudio (optional)
554 MS-Windows native audio device driver. Examples:
555 sox infile -t waveaudio
556 sox infile -t waveaudio default
557 sox infile -t waveaudio 1
558 sox infile -t waveaudio "High Definition Audio Device ("
559 If the device name is omitted, -1, or default, then you get the
560 `Microsoft Wave Mapper' device. Wave Mapper means `use the sys‐
561 tem default audio devices'. You can control what `default'
562 means via the OS Control Panel.
563 If the device name given is some other number, you get that
565 audio device by index; so recording with device name 0 would get
566 the first input device (perhaps the microphone), 1 would get the
567 second (perhaps line in), etc. Playback using 0 will get the
568 first output device (usually the only audio device).
569 If the device name given is something other than a number, SoX
571 tries to match it (maximum 31 characters) against the names of
572 the available devices.
573 See also play(1), rec(1), and sox(1) -d.
575 .wavpcm
577 A non-standard, but widely used, variant of .wav. Some applica‐
578 tions cannot read a standard WAV file header for PCM-encoded
579 data with sample-size greater than 16-bits or with more than two
580 channels, but can read a non-standard WAV header. It is likely
581 that such applications will eventually be updated to support the
582 standard header, but in the mean time, this SoX format can be
583 used to create files with the non-standard header that should
584 work with these applications. (Note that SoX will automatically
585 detect and read WAV files with the non-standard header.)
586 The most common use of this file-type is likely to be along the
588 following lines:
589 sox infile.any -t wavpcm -s outfile.wav
590 .wv (optional)
592 WavPack lossless audio compression. Note that, when converting
593 .wav to this format and back again, the RIFF header is not nec‐
594 essarily preserved losslessly (though the audio is).
595 .wve (also with -t sndfile)
597 Psion 8-bit A-law. Used on Psion SIBO PDAs (Series 3 and simi‐
598 lar). This format is deprecated in SoX, but will continue to be
599 used in libsndfile.
600 .xa Maxis XA files. These are 16-bit ADPCM audio files used by
602 Maxis games. Writing .xa files is currently not supported,
603 although adding write support should not be very difficult.
604 .xi (optional)
606 Fasttracker 2 Extended Instrument format.
607
609 sox(1), soxi(1), libsox(3), octave(1), wget(1)
610 The SoX web page at http://sox.sourceforge.net
612 SoX scripting examples at http://sox.sourceforge.net/Docs/Scripts
613 References
615 [1] Wikipedia, M3U, http://en.wikipedia.org/wiki/M3U
616 [2] Wikipedia, PLS, http://en.wikipedia.org/wiki/PLS_(file_format)
618
620 Copyright 1998-2013 Chris Bagwell and SoX Contributors.
621 Copyright 1991 Lance Norskog and Sundry Contributors.
622
624 Chris Bagwell (cbagwell@users.sourceforge.net). Other authors and con‐
625 tributors are listed in the ChangeLog file that is distributed with the
626 source code.
627soxformat February 1, 2013 SoX(7)