163 lines
7.1 KiB
Groff
163 lines
7.1 KiB
Groff
.\" $NetBSD: speaker.4,v 1.5 2001/09/11 00:08:30 wiz Exp $
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.\"
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.\" Copyright (c) 1993 Christopher G. Demetriou
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed for the
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.\" NetBSD Project. See http://www.netbsd.org/ for
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.\" information about NetBSD.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
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.\"
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.Dd August 6, 1993
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.Dt SPEAKER 4
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.Os
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.Sh NAME
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.Nm speaker
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.Nd console speaker audio device driver
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.Sh SYNOPSIS
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.Cd "spkr0 at pcppi?"
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.Fd #include <machine/spkr.h>
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.Pa /dev/speaker
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.Sh DESCRIPTION
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The speaker device driver allows applications to control the console
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speaker on machines with a PC-like 8253 timer implementation.
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.Pp
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Only one process may have this device open at any given time; open() and
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close() are used to lock and relinquish it. An attempt to open() when
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another process has the device locked will return -1 with an EBUSY error
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indication. Writes to the device are interpreted as 'play strings' in a
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simple ASCII melody notation. An ioctl() for tone generation at arbitrary
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frequencies is also supported.
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.Pp
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Sound-generation does \fInot\fR monopolize the processor; in fact, the driver
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spends most of its time sleeping while the PC hardware is emitting
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tones. Other processes may emit beeps while the driver is running.
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.Pp
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Applications may call ioctl() on a speaker file descriptor to control the
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speaker driver directly; definitions for the ioctl() interface are in
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<machine/spkr.h>. The tone_t structure used in these calls has two fields,
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specifying a frequency (in hz) and a duration (in 1/100ths of a second).
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A frequency of zero is interpreted as a rest.
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.Pp
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At present there are two such ioctls. SPKRTONE accepts a pointer to a
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single tone structure as third argument and plays it. SPKRTUNE accepts a
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pointer to the first of an array of tone structures and plays them in
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continuous sequence; this array must be terminated by a final member with
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a zero duration.
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.Pp
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The play-string language is modelled on the PLAY statement conventions of
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IBM BASIC 2.0. The MB, MF and X primitives of PLAY are not useful in a UNIX
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environment and are omitted. The `octave-tracking' feature is also new.
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.Pp
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There are 84 accessible notes numbered 1-83 in 7 octaves, each running from
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C to B, numbered 0-6; the scale is equal-tempered A440 and octave 3 starts
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with middle C. By default, the play function emits half-second notes with the
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last 1/16th second being `rest time'.
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.Pp
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Play strings are interpreted left to right as a series of play command groups;
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letter case is ignored. Play command groups are as follows:
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.Pp
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CDEFGAB -- letters A through G cause the corresponding note to be played in the
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current octave. A note letter may optionally be followed by an \fIaccidental
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sign\fR, one of # + or -; the first two of these cause it to be sharped one
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half-tone, the last causes it to be flatted one half-tone. It may also be
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followed by a time value number and by sustain dots (see below). Time values
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are interpreted as for the L command below;.
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.Pp
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O <n> -- if <n> is numeric, this sets the current octave. <n> may also be one
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of 'L' or 'N' to enable or disable octave-tracking (it is disabled by default).
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When octave-tracking is on, interpretation of a pair of letter notes will
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change octaves if necessary in order to make the smallest possible jump between
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notes. Thus "olbc" will be played as "olb>c", and "olcb" as "olc<b". Octave
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locking is disabled for one letter note following by >, < and O[0123456].
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.Pp
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> -- bump the current octave up one.
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.Pp
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< -- drop the current octave down one.
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.Pp
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N <n> -- play note n, n being 1 to 84 or 0 for a rest of current time value.
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May be followed by sustain dots.
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.Pp
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L <n> -- sets the current time value for notes. The default is L4, quarter
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notes. The lowest possible value is 1; values up to 64 are accepted. L1 sets
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whole notes, L2 sets half notes, L4 sets quarter notes, etc..
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.Pp
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P <n> -- pause (rest), with <n> interpreted as for L. May be followed by
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sustain dots. May also be written '~'.
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.Pp
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T <n> -- Sets the number of quarter notes per minute; default is 120. Musical
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names for common tempi are:
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.Bl -column Description Tempo BPM -offset indent
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.Em Tempo Beats per Minute
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very slow Larghissimo
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Largo 40-60
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Larghetto 60-66
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Grave
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Lento
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Adagio 66-76
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slow Adagietto
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Andante 76-108
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medium Andantino
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Moderato 108-120
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fast Allegretto
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Allegro 120-168
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Vivace
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Veloce
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Presto 168-208
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very fast Prestissimo
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.El
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.Pp
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M[LNS] -- set articulation. MN (N for normal) is the default; the last 1/8th of
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the note's value is rest time. You can set ML for legato (no rest space) or
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MS (staccato) 1/4 rest space.
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.Pp
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Notes (that is, CDEFGAB or N command character groups) may be followed by
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sustain dots. Each dot causes the note's value to be lengthened by one-half
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for each one. Thus, a note dotted once is held for 3/2 of its undotted value;
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dotted twice, it is held 9/4, and three times would give 27/8.
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.Pp
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Whitespace in play strings is simply skipped and may be used to separate
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melody sections.
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.Sh BUGS
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Due to roundoff in the pitch tables and slop in the tone-generation and timer
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hardware (neither of which was designed for precision), neither pitch accuracy
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nor timings will be mathematically exact.
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.Pp
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There is no volume control.
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.Pp
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In play strings which are very long (longer than your system's physical I/O
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blocks) note suffixes or numbers may occasionally be parsed incorrectly due
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to crossing a block boundary.
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.Sh FILES
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.Bl -tag -width Pa -compact
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.It Pa /dev/speaker
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.El
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.Sh SEE ALSO
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.Xr pcppi 4
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.Sh AUTHORS
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Eric S. Raymond (esr@snark.thyrsus.com) Feb 1990
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