.TH AUDIO 1
.SH NAME
-mp3dec, mp3enc, oggdec, oggenc, flacdec \- decode and encode audio files
+mp3dec, mp3enc, oggdec, oggenc, flacdec, sundec, wavdec, pcmconv, mixfs \- decode and encode audio files
.SH SYNOPSIS
.B audio/mp3dec
[
.B audio/oggdec
.br
.B audio/flacdec
+.br
+.B audio/wavdec
+.br
+.B audio/sundec
.PP
.B audio/oggenc
.br
.I "long or silly options"
]
.PP
+.B audio/pcmconv
+[
+.B -i
+.I fmt
+] [
+.B -o
+.I fmt
+] [
+.B -l
+.I length
+]
+.PP
+.B audio/mixfs
+[
+.B -D
+] [
+.B -s
+.I srvname
+] [
+.B -m
+.I mtpt
+]
+.PP
.SH DESCRIPTION
These programs decode and encode various audio formats from and to
16-bit stereo PCM (little endian). The decoders read the compressed
decodes MPEG audio (layer 1, 2 and 3). The
.B -d
option enables debug output to standard error.
-.I Oggdec
+.I Oggdec,
+.I flacdec,
+.I sunwdec
and
-.I flacdec
+.I wavdec
are like
.I mp3dec
-but decode OGG Vorbis and FLAC lossless audio.
+but decode OGG Vorbis, FLAC lossless audio, Sun audio and RIFF wave.
.PP
The encoders read PCM on standard input and produce compressed audio
on standard output.
+.PP
.I Oggenc
and
.I mp3enc
or
.BR -v
(variable bitrate, VBR).
+.PP
+.I Oggenc
+accepts raw PCM in the same byte order as
+.B /dev/audio
+(little-endian),
+t
+.I mp3enc -r
+expects big-endian.
.SS Options
.TF "\fB-b \fP"
.TP
.IR sfreq ,
default is input sfreq.
.TP
-.BI --mp3input
-.I input
+.BI --mp3input " input"
is an MP3 file
.
.SS Silly options
.TF --nohist
.TP
-.BI -f
+.B -f
same as
.LR "-q 7" .
Such a deal.
.TP
-.BI -o
+.B -o
mark as non-original (i.e. do not set the original bit)
.TP
-.BI -c
+.B -c
mark as copyright
.TP
-.BI -k
+.B -k
disable sfb=21 cutoff
.TP
.BI -e " emp"
de-emphasis n/5/c
(default n)
.TP
-.BI -d
+.B -d
allow channels to have different blocktypes
.TP
-.BI -t
+.B -t
disable Xing VBR informational tag
.TP
-.BI -a
+.B -a
autoconvert from stereo to mono file for mono encoding
.TP
-.BI -x
+.B -x
force byte-swapping of input (see
.IR dd (1)
instead)
.TP
-.BI -S
+.B -S
don't print progress report, VBR histograms
.TP
-.BI --athonly
+.B --athonly
only use the ATH for masking
.TP
-.BI --nohist
+.B --nohist
disable VBR histogram display
.TP
-.BI --voice
+.B --voice
experimental voice mode
-.
+.SS
+.I Pcmconv
+is a helper program used to convert various PCM sample formats. The
+.B -i
+and
+.B -o
+options specify the input and output format
+.I fmt
+of the conversion.
+.I Fmt
+is a concatenated string of the following parts:
+.TP
+.BI s #
+sample format is little-endian signed integer where
+.I #
+specifies the number of bits
+.TP
+.BI u #
+unsigned little-endian integer format
+.TP
+.BI S #
+singed big-endian integer format
+.TP
+.BI U #
+unsigned big-endian integer format
+.TP
+.BI f #
+floating point format where
+.I #
+has to be 32 or 64 for single- or double-precision
+.TP
+.B a8
+8-bit a-law format
+.TP
+.B µ8
+8-bit µ-law format
+.TP
+.BI c #
+specifies the number of channels
+.TP
+.BI r #
+gives the samplerate in Hz
+.PP
+The program reads samples from standard
+input converting the data and writes the result to standard output
+until it reached end of file or, if
+.B -l
+was given, a number of
+.I length
+bytes have been consumed from input.
+.PP
+.I Mixfs
+is a fileserver serving a single
+.B audio
+file which allows simultaneous playback of audio streams. When
+run, it binds over
+.B /dev/audio
+and mixes the audio samples that are written to it.
+A service name
+.I srvname
+can be given with the
+.B -s
+option which gets posted to
+.BR /srv .
+By default,
+.I mixfs
+mounts itself on
+.B /mnt/mix
+and then binds
+.B /mnt/mix/audio
+over
+.BR /dev .
+A alternative mountpoint
+.I mtpt
+can be specified with the
+.B -m
+option.
+The
+.B -D
+option causes
+.B 9p
+debug messages to be written to file-descriptor 2.
.SH EXAMPLE
-Plays back a
+Play back an
.L .mp3
.IP
.EX
file as highest-quality MP3.
.IP
.EX
-audio/mp3enc -q 0 -b 320
+audio/mp3enc -q 0 -b 320 <foo.wav >foo.mp3
.EE
.LP
Create a fixed 128Kb/s MP3 file from a
.B http://xiph.org/doc/
.br
.B http://flac.sourceforge.net/documentation.html
-.SH BUGS
-It's another GNU behemoth, lightly tamed.
+.SH HISTORY
+.I Pcmconv
+first appeared in 9front (December, 2012).
+.I Mixfs
+first appeared in 9front (December, 2013).
projects / plan9front.git / blobdiff