60 lines
1.1 KiB
Plaintext
60 lines
1.1 KiB
Plaintext
.TH OPL3 1
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.SH NAME
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opl3 \- OPL3 chip emulator
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.SH SYNOPSIS
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.B opl3
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[
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.B -r
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.I rate
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] [
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.I file
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]
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.SH DESCRIPTION
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.I Opl3
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is an emulator of a single Yamaha 262 chip, also known as
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.SM OPL3.
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.PP
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The emulated chip is programmed by a stream of commands either from
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.I file
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or from standard in.
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It then synthesizes a number of stereo 16 bit little-endian samples for a sampling rate of 44.1 kHz,
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and writes them to standard out.
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.PP
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Commands are 5 bytes wide, in little-endian byte order:
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.PP
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.RS
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.IR register [2]
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.IR value [1]
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.IR delay [2]
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.RE
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.PP
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Each command specifies a
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.I value
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to be written to an
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.SM OPL3
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chip
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.IR register ,
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modifying its internal state.
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.PP
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The
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.I delay
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field provides timing.
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It is a multiple of a command period, during which the
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.SM OPL3
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chip may be sampled before processing the next command.
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The period itself is the inverse of the sampling rate, 44100 Hz by default.
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This rate can be set using the
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.B -r
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parameter.
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.SH SOURCE
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.B /sys/src/games/opl3
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.SH "SEE ALSO"
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.IR audio (3)
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.SH HISTORY
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.I Opl3
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first appeared in 9front (July, 2018), based on
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.I ymf262.c
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from the Multiple Arcade Machine Emulator (
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.SM MAME
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).
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