mirror of
https://github.com/alsa-project/alsa-utils
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cb8494d8d4
- accept -h as the help :) - fixed VU meter for 8 bit and negative values. - updated man page.
151 lines
3.5 KiB
Groff
151 lines
3.5 KiB
Groff
.TH APLAY 1 "2 August 2001"
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.SH NAME
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arecord, aplay \- command-line sound recorder and player for ALSA
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soundcard driver
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.SH SYNOPSIS
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\fBarecord\fP [\fIflags\fP] [filename]
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.SH SYNOPSIS
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\fBaplay\fP [\fIflags\fP] [filename [filename]] ...
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.SH DESCRIPTION
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\fBarecord\fP is a command-line soundfile recorder for the ALSA soundcard
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driver. It supports several file formats and multiple soundcards with
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multiple devices.
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\fBaplay\fP is much the same, only it plays instead of recording. For
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supported soundfile formats, the sampling rate, bit depth, and so
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forth can be automatically determined from the soundfile header.
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.SH INVOKING
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[\fBarecord\fP | \fBaplay\fP ] [\fIflags\fP] filename
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.TP
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If filename is not specified, the standard output or input is used. The \fBaplay\fP utility accepts multiple filenames.
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.SS Options
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.TP
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\fI-h, --help\fP
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Help: show syntax.
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.TP
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\fI--version\fP
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Print current version.
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.TP
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\fI-l, --list-devices\fP
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List all soundcards and digital audio devices
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.TP
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\fI-L, --list-pcms\fP
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List all PCMs defined
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.TP
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\fI-D, --device=NAME\fP
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Select PCM by name
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.TP
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\fI-q --quiet\fP
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Quiet mode. Suppress messages (not sound :))
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.TP
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\fI-t, --file-type TYPE\fP
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File type (voc, wav, raw or au)
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.TP
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\fI-c, --channels=#\fP
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The number of channels
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.TP
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\fI-f --format=FORMAT\fP
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Sample format
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.br
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Recognized sample formats are: S8 U8 S16_LE S16_BE U16_LE U16_BE S24_LE
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S24_BE U24_LE U24_BE S32_LE S32_BE U32_LE U32_BE FLOAT_LE FLOAT_BE
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FLOAT64_LE FLOAT64_BE IEC958_SUBFRAME_LE IEC958_SUBFRAME_BE MU_LAW
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A_LAW IMA_ADPCM MPEG GSM
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.br
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Some of these may not be available on selected hardware
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.br
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There are also two format shortcuts available:
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.nf
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-f cd (16 bit little endian, 44100, stereo [-f S16_LE -c2 -r44100]
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-f dat (16 bit little endian, 48000, stereo) [-f S16_LE -c2 -r48000]
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.fi
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.TP
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\fI-r, --rate=#<Hz>\fP
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Sampling rate in Hertz.
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.TP
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\fI-d, --duration=#\fP
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Interrupt after # seconds
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.TP
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\fI-s, --sleep-min=#\fP
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Min ticks to sleep
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.TP
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\fI-M, --mmap\fP
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Mmap stream
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.TP
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\fI-N, --nonblock\fP
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Nonblocking mode
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.TP
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\fI-F, --period-time=#\fP
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Distance between interrupts is # microseconds
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.TP
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\fI-B, --buffer-time=#\fP
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Buffer duration is # microseconds
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.TP
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\fI--period-size=#\fP
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Distance between interrupts is # frames
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.TP
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\fI--buffer-size=#\fP
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Buffer duration is # frames
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.TP
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\fI-A, --avail-min=#\fP
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Min available space for wakeup is # microseconds
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.TP
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\fI-R, --start-delay=#\fP
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Delay for automatic PCM start is # microseconds
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(relative to buffer size if <= 0)
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.TP
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\fI-T, --stop-delay=#\fP
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Delay for automatic PCM stop is # microseconds from xrun
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.TP
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\fI-v, --verbose\fP
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Show PCM structure and setup.
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This option is accumulative. The VU meter is displayed when this
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is given twice.
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.TP
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\fI-I, --separate-channels\fP
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One file for each channel
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.SS
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Example:
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.RS
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\fBaplay -c 1 -t raw -r 22050 -f mu_law foobar\fR
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.ID
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will play the raw file "foobar" as a
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22050-Hz, mono, 8-bit, Mu-Law .au file.
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\fBarecord -d 10 -f cd -t wav -D copy foobar.wav\fP
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will record foobar.wav as a 10-second, CD-quality wave file, using the
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PCM "copy" (which might be defined in the user's .asoundrc file as:
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.nf
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pcm.copy {
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type plug
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slave {
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pcm hw
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}
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route_policy copy
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}
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.fi
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.SH SEE ALSO
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\fB
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alsamixer(1),
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amixer(1)
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\fP
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.SH BUGS
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Note that .aiff files are not currently supported.
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.SH AUTHOR
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\fBarecord\fP and \fBaplay\fP are by Jaroslav Kysela <perex@suse.cz>
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This document is by Paul Winkler <zarmzarm@erols.com>.
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Updated for Alsa 0.9 by James Tappin <james@xena.uklinux.net>
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