aplay



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.

       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 immediatly.  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.

       --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.

       -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@suse.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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