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APLAY(1)		    General Commands Manual		      APLAY(1)

       arecord,	aplay -	command-line sound recorder and	player for ALSA	sound-
       card driver

       arecord [flags] [filename]
       aplay [flags] [filename [filename]] ...

       arecord is a command-line soundfile recorder  for  the  ALSA  soundcard
       driver.	It  supports several file formats and multiple soundcards with
       multiple	devices. If recording with interleaved mode samples  the  file
       is automatically	split before the 2GB filesize.

       aplay  is  much	the same, only it plays	instead	of recording. For sup-
       ported soundfile	formats, the sampling rate, bit	depth,	and  so	 forth
       can be automatically determined from the	soundfile header.

       If filename is not specified, the standard output or input is used. The
       aplay utility accepts multiple filenames.

       -h, --help
	      Help: show syntax.

	      Print current version.

       -l, --list-devices
	      List all soundcards and digital audio devices

       -L, --list-pcms
	      List all PCMs defined

       -D, --device=NAME
	      Select PCM by name

       -q --quiet
	      Quiet mode. Suppress messages (not sound :))

       -t, --file-type TYPE
	      File type	(voc, wav, raw or au).	If this	parameter  is  omitted
	      the WAVE format is used.

       -c, --channels=#
	      The number of channels.  The default is one channel.  Valid val-
	      ues are 1	through	32.

       -f --format=FORMAT
	      Sample format
	      Recognized sample	formats	are: S8	U8 S16_LE S16_BE U16_LE	U16_BE
	      S24_LE S24_BE U24_LE U24_BE S32_LE S32_BE	U32_LE U32_BE FLOAT_LE
	      U24_3LE U24_3BE S20_3LE S20_3BE U20_3LE U20_3BE S18_3LE  S18_3BE
	      Some of these may	not be available on selected hardware
	      The available format shortcuts are:
	      -f cd (16	bit little endian, 44100, stereo) [-f S16_LE -c2 -r44100]
	      -f cdr (16 bit big endian, 44100,	stereo)	[-f S16_BE -c2 -f44100]
	      -f dat (16 bit little endian, 48000, stereo) [-f S16_LE -c2 -r48000]
	      If no format is given U8 is used.

       -r, --rate=#_Hz_
	      Sampling	rate in	Hertz. The default rate	is 8000	Hertz.	If the
	      value specified is less than 300,	it is taken  as	 the  rate  in
	      kilohertz.  Valid	values are 2000	through	192000 Hertz.

       -d, --duration=#
	      Interrupt	after #	seconds.  A value of zero means	infinity.  The
	      default is zero, so if this option is omitted then  the  arecord
	      process will run until it	is killed.

       -s, --sleep-min=#
	      Min ticks	to sleep. The default is not to	sleep.

       -M, --mmap
	      Use memory-mapped	(mmap) I/O mode	for the	audio stream.  If this
	      option is	not set, the read/write	I/O mode will be used.

       -N, --nonblock
	      Open the audio device in non-blocking mode.  If  the  device  is
	      busy  the	 program will exit immediately.	 If this option	is not
	      set the program will block until the audio device	 is  available

       -F, --period-time=#
	      Distance	between	 interrupts  is	 # microseconds.  If no	period
	      time and no period size is given then a quarter  of  the	buffer
	      time is set.

       -B, --buffer-time=#
	      Buffer  duration is # microseconds If no buffer time and no buf-
	      fer size is given	then the maximal allowed buffer	time  but  not
	      more than	500ms is set.

	      Distance between interrupts is # frames If no period size	and no
	      period time is given then	a quarter of the buffer	size is	set.

	      Buffer duration is # frames If no	buffer time and	no buffer size
	      is  given	then the maximal allowed buffer	time but not more than
	      500ms is set.

       -A, --avail-min=#
	      Min available space for wakeup is	# microseconds

       -R, --start-delay=#
	      Delay for	automatic PCM start is	#  microseconds	 (relative  to
	      buffer size if <=	0)

       -T, --stop-delay=#
	      Delay for	automatic PCM stop is #	microseconds from xrun

       -v, --verbose
	      Show PCM structure and setup.  This option is accumulative.  The
	      VU meter is displayed when this is given twice or	three times.

       -V, --vumeter=TYPE
	      Specifies	the VU-meter type, either stereo or mono.  The	stereo
	      VU-meter is available only for 2-channel stereo samples with in-
	      terleaved	format.

       -I, --separate-channels
	      One file for each	channel.  This option  disables	 max-file-time
	      and  use-strftime,  and ignores SIGUSR1.	The stereo VU meter is
	      not available with separate channels.

       -P     Playback.	 This is the default if	the program is invoked by typ-
	      ing aplay.

       -C     Record.  This is the default if the program is invoked by	typing

       -i, --interactive
	      Allow interactive	operation via stdin.  Currently	only pause/re-
	      sume via space or	enter key is implemented.

       -m, --chmap=ch1,ch2,...
	      Give  the	channel	map to override	or follow.  Pass channel posi-
	      tion strings like	FL, FR,	etc.

	      If a device supports the override	 of  the  channel  map,	 aplay
	      tries  to	pass the given channel map.  If	it doesn't support the
	      channel map override but still it	provides the channel  map  in-
	      formation,  aplay	 tries	to  rearrange the channel order	in the
	      buffer to	match with the returned	channel	map from the device.

	      Disable automatic	rate resample.

	      Disable automatic	channel	conversions.

	      Disable automatic	format conversions.

	      Disable software volume control (softvol).

	      Test ring	buffer position.

	      Test coefficient for ring	buffer position; default  is  8.   Ex-
	      pression	for  validation	is: coef * (buffer_size	/ 2).  Minimum
	      value is 1.

	      Do not wait for the ring buffer -	eats the whole CPU.

	      While recording, when the	 output	 file  has  been  accumulating
	      sound  for  this long, close it and open a new output file.  De-
	      fault is the maximum size	supported by the file  format:	2  GiB
	      for  WAV	files.	This option has	no effect if  --separate-chan-
	      nels is specified.

       --process-id-file _file name_
	      aplay writes its process ID here,	so  other  programs  can  send
	      signals to it.

	      When recording, interpret	%-codes	in the file name parameter us-
	      ing the strftime facility	whenever the output  file  is  opened.
	      The  important  strftime codes are: %Y is	the year, %m month, %d
	      day of the month,	%H hour, %M minute and %S  second.   In	 addi-
	      tion, %v is the file number, starting at 1.  When	this option is
	      specified, intermediate directories for the output file are cre-
	      ated  automatically.   This  option  has	no  effect  if --sepa-
	      rate-channels is specified.

	      Dump hw_params of	the device preconfigured status	to stderr. The
	      dump lists capabilities of the selected device such as supported
	      formats, sampling	rates, numbers of channels, period and	buffer
	      bytes/sizes/times.   For	raw  device hw:X this option basically
	      lists hardware capabilities of the soundcard.

	      Disables recovery	attempts when errors (e.g. xrun)  are  encoun-
	      tered; the aplay process instead aborts immediately.

       When  recording,	SIGINT,	SIGTERM	and SIGABRT will close the output file
       and exit.  SIGUSR1 will close the output	file, open a new one, and con-
       tinue  recording.  However, SIGUSR1 does	not work with --separate-chan-

       aplay -c	1 -t raw -r 22050 -f mu_law foobar
	      will play	the raw	file "foobar"  as  a  22050-Hz,	 mono,	8-bit,
	      Mu-Law .au file.

       arecord -d 10 -f	cd -t wav -D copy foobar.wav
	      will record foobar.wav as	a 10-second, CD-quality	wave file, us-
	      ing the PCM  "copy"  (which  might  be  defined  in  the	user's
	      .asoundrc	file as:
	      pcm.copy {
		type plug
		slave {
		  pcm hw
		route_policy copy

       arecord -t wav --max-file-time 30 mon.wav
	      Record  from the default audio source in monaural, 8,000 samples
	      per second, 8 bits per sample.  Start a new file every  30  sec-
	      onds.   File  names  are mon-nn.wav, where nn increases from 01.
	      The file after mon-99.wav	is mon-100.wav.

       arecord -f cd -t	wav --max-file-time 3600 --use-strftime	 %Y/%m/%d/lis-
	      Record  in  stereo  from the default audio source.  Create a new
	      file every hour.	The files are placed in	directories  based  on
	      their start dates	and have names which include their start times
	      and file numbers.

	alsamixer(1), amixer(1)

       Note that .aiff files are not currently supported.

       arecord and aplay are by	Jaroslav Kysela	<> This document
       is by Paul Winkler <>.	 Updated for Alsa 0.9 by James
       Tappin <>

				1 January 2010			      APLAY(1)


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