aplay - Online in the Cloud

PROGRAM:

NAME

arecord, aplay - command-line sound recorder and player for ALSA soundcard 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 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.

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 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 IEC958_SUBFRAME_BE MU_LAW A_LAW IMA_ADPCM MPEG GSM SPECIAL
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 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 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 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
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-channels 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. 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
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.

--fatal-errors
Disables recovery attempts when errors (e.g. xrun) are encountered; 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 continue recording. However, SIGUSR1 does
not work with --separate-channels.

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 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.

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