Provided by: alsa-utils_1.0.27.2-1ubuntu2_i386 bug


       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 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
              values 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
              FLOAT_BE      FLOAT64_LE      FLOAT64_BE      IEC958_SUBFRAME_LE
              S24_3LE S24_3BE U24_3LE U24_3BE S20_3LE S20_3BE U20_3LE  U20_3BE
              S18_3LE S18_3BE U18_3LE
              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
              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 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.  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

       -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
              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.
              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-channels 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 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
              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


       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
              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)