arecord

       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.  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
              FLOAT_BE FLOAT64_LE  FLOAT64_BE  IEC958_SUBFRAME_LE  IEC958_SUB-
              FRAME_BE MU_LAW A_LAW IMA_ADPCM MPEG GSM SPECIAL S24_3LE S24_3BE
              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 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
       -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 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
              information,  aplay  tries to rearrange the channel order in the
              buffer to match with the returned channel map from the device.

       --disable-resample
              Disable automatic rate resample.

       --disable-channels
              Disable automatic channel conversions.

       --disable-format
              Disable automatic format conversions.

       --disable-softvol
              Disable software volume control (softvol).

       --test-position
              Test ring buffer position.

       --test-coef=<coef>
              Test  coefficient  for  ring  buffer  position;  default  is  8.
              Expression for validation is: coef * (buffer_size / 2).  Minimum
              value is 1.

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

       --max-file-time
              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.

       --use-strftime
              When  recording,  interpret  %-codes  in the file name parameter
              using the strftime facility whenever the output file is  opened.
              lists hardware capabilities of the soundcard.

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


SIGNALS
       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-
       nels.


EXAMPLES
       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  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-
       ten-%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.


SEE ALSO
        alsamixer(1), amixer(1)


BUGS
       Note that .aiff files are not currently supported.
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