OPL3(1)OPL3(1)
NAME
opl3 – OPL3 chip emulator
SYNOPSIS
opl3
[
-s
] [
-r
rate
] [
file
]
DESCRIPTION
Opl3
is an emulator of a single Yamaha YMF262 chip, also known as
OPL3.
The emulated chip is programmed by a series of commands either from
file
or from standard in.
It then synthesizes stereo 16-bit little-endian PCM samples
at the chip’s sampling rate, 49.716 kHz,
resamples them to
audio(3)’s
default 44.1 kHz rate,
and writes them to standard out.
The
-s
flag enables streaming mode,
in which the input is a pipe streaming commands
in identical format and semantics as described below,
but in real time.
Command format
Commands are 5 bytes wide, in little-endian byte order:
register[2]
value[1]
delay[2]
Each command specifies a
value
to be written to an
OPL3
chip
register,
modifying its internal state.
The
delay
field provides timing.
It is a multiple of a command period, during which the
OPL3
chip may be sampled before processing the next command.
The period itself is the inverse of the input stream’s sampling rate,
by default the same as the chip’s output sampling rate.
The
-r
parameter
sets the input sampling rate.
SOURCE
/sys/src/games/opl3
SEE ALSO
dmid(1),
audio(3)
Yamaha
“YMF262 Manual”,
1994.
V. Arnost
“Programmer’s Guide to Yamaha YMF 262/OPL3 FM Music Synthesizer”,
version 1.12 dated Nov. 23rd 2000.
HISTORY
Opl3
first appeared in 9front (July, 2018), based on
ymf262.c
from the Multiple Arcade Machine Emulator (
MAME
).