arecord man page on SuSE

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APLAY(1)							      APLAY(1)

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

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

DESCRIPTION
       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.

OPTIONS
       -h, --help
	      Help: show syntax.

       --version
	      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.

       -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
	      FLOAT_BE	FLOAT64_LE  FLOAT64_BE	IEC958_SUBFRAME_LE IEC958_SUB‐
	      FRAME_BE MU_LAW A_LAW IMA_ADPCM MPEG GSM
	      Some of these may not be available on selected hardware
	      There are also two format shortcuts available:
	      -f cd (16 bit little endian, 44100, stereo [-f S16_LE -c2 -r44100]
	      -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.

       -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  buf‐
	      fer  size	 is given then the maximal allowed buffer time but not
	      more than 500ms is set.

       --period-size=#
	      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-size=#
	      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
	      interleaved format.

       -I, --separate-channels
	      One file for each channel

   Example:
       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
	      }

SEE ALSO
	alsamixer(1), amixer(1)

BUGS
       Note that .aiff files are not currently supported.

AUTHOR
       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>

				 2 August 2001			      APLAY(1)
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