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APLAY(1)										 APLAY(1)

       arecord, aplay - command-line sound recorder and player for ALSA soundcard 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 supported soundfile for-
       mats, 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

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

       -f --format=FORMAT
	      Sample format
	      Recognized sample formats are: S8 U8 S16_LE  S16_BE  U16_LE  U16_BE  S24_LE  S24_BE
	      S24_3LE  S24_3BE	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 again.

       -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 buffer 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  dis-
	      played 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 avail-
	      able only for 2-channel stereo samples with interleaved 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 typing aplay.

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

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

       -m, --chmap=ch1,ch2,...
	      Give the channel map to override or follow.  Pass channel position 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 information, aplay tries to rearrange the channel order in the buf-
	      fer 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.	Expression 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.  Default 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  using  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
	      addition,  %v  is  the  file number, starting at 1.  When this option is specified,
	      intermediate directories for the	output	file  are  created  automatically.   This
	      option has no effect if --separate-channels is specified.

	      Dump  hw_params  of the device preconfigured status to stderr. The dump lists capa-
	      bilities 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  encountered;  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 continue recording.  However, SIGUSR1 does
       not work with --separate-channels.

       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, using 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 seconds.  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/listen-%H-%M-%v.wav
	      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 <perex@perex.cz> This document is by Paul Winkler
       <zarmzarm@erols.com>.  Updated for Alsa 0.9 by James Tappin <james@xena.uklinux.net>

					  1 January 2010				 APLAY(1)
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