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GNU/Linux |
CentOS 4.8 |
i386 |
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arecord(1) |
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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.
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.
[arecord
| aplay ] [flags] filename
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)
-c, --channels=#
The number of channels
-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
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]
-r, --rate=#<Hz>
Sampling rate in Hertz.
-d, --duration=#
Interrupt after # seconds
-s, --sleep-min=#
Min ticks to sleep
-M, --mmap
Mmap stream
-N, --nonblock
Nonblocking mode
-F, --period-time=#
Distance between interrupts is # microseconds
-B, --buffer-time=#
Buffer duration is # microseconds
--period-size=#
Distance between interrupts is # frames
--buffer-size=#
Buffer duration is # frames
-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
}
alsamixer(1), amixer(1)
Note that .aiff files are not currently supported.
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>
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arecord(1) | |