mirror of
https://github.com/alsa-project/alsa-utils
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c58817e8af
Added the support of stereo VU-meter. Enabled via -Vs option. The new option, -V, can be used to enable the VU-meter. Now VU-meter can be enabled even without -vv.
160 lines
4.8 KiB
Groff
160 lines
4.8 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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.br
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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. If recording with interleaved mode samples the file is
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automatically split before the 2GB filesize.
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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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If filename is not specified, the standard output or input is used. The \fBaplay\fP utility accepts multiple filenames.
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.SH 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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If this parameter is omitted the WAVE format is used.
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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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The default is one channel.
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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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If no format is given U8 is used.
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.TP
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\fI\-r, \-\-rate=#<Hz>\fP
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Sampling rate in Hertz. The default rate is 8000 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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A value of zero means infinity.
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The default is zero, so if this option is omitted then the arecord process will run until it is killed.
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.TP
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\fI\-s, \-\-sleep\-min=#\fP
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Min ticks to sleep. The default is not to sleep.
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.TP
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\fI\-M, \-\-mmap\fP
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Use memory-mapped (mmap) I/O mode for the audio stream.
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If this option is not set, the read/write I/O mode will be used.
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.TP
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\fI\-N, \-\-nonblock\fP
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Open the audio device in non-blocking mode. If the device is busy the program will exit immediately.
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If this option is not set the program will block until the audio device is available again.
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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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If no period time and no period size is given then a quarter of the buffer time is set.
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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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If no buffer time and no buffer size is given then the maximal allowed buffer time but not more than 500ms is set.
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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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If no period size and no period time is given then a quarter of the buffer size is set.
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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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If no buffer time and no buffer size is given then the maximal allowed buffer time but not more than 500ms is set.
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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 or three times.
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.TP
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\fI\-V, \-\-vumeter=TYPE\fP
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Specifies the VU-meter type, either \fIstereo\fP or \fImono\fP.
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The stereo VU-meter is available only for 2-channel stereo samples
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with interleaved format.
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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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.TP
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\fBaplay \-c 1 \-t raw \-r 22050 \-f mu_law foobar\fR
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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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.TP
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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@perex.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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