Provided by: gbsplay_0.0.94+git20210915-1_amd64 
NAME
gbsplay - Gameboy sound player
SYNOPSIS
gbsplay [options] gbs-file [start-subsong [stop-subsong] ]
DESCRIPTION
gbsplay emulates the sound hardware of the Nintendo Gameboy. It is able to play the
sounds from a Gameboy module dump (.GBS format) over /dev/dsp and other sound drivers.
OPTIONS
-E endian
Set endianness to endian. Valid values are b, l and n for big, little and native
endian respectively.
-f fadeout-time
Set fadeout time to fadeout-time seconds. Instead of cutting the subsong off hard,
do a soft fadeout. Default value is 3 seconds.
-g subsong-gap
Set subsong gap to subsong-gap seconds. Before playing the next subsong after the
subsong timeout, subsong-gap seconds of silence will be played. Default value is 2
seconds.
-h Display short help and exit.
-H filter
Set output high-pass type to filter. Valid values are dmg (Gameboy Classic), cgb
(Gameboy Color) and off (no filter). Default value is dmg.
-l Enable loop mode. After the last subsong has been played, playback starts again
with the first subsong. Default is no loop.
-o plugin
Select sound output plugin plugin. Select list to view a list of all available
output plugins. Default value depends on compilation options.
-q Be quieter, reduce verbosity. Can be applied multiple times. Default verbosity is
3.
-r samplerate
Set the samplerate to samplerate Hz. Default value is 44100Hz.
-R refresh-delay
Set the refresh delay to refresh-delay milliseconds. Larger values will lower CPU
usage, but things as subsong changes, fadeouts, reactions to keypresses and the
on-screen display will be delayed. Default value is 33 milliseconds.
-t subsong-timeout
Set subsong timeout to subsong-timeout seconds. When a subsong has been played for
the given time, the player will skip to the next subsong. A timeout of 0 seconds
disables automatic subsong changes. Default value is 120 seconds.
-T silence-timeout
Set silence timeout to silence-timeout seconds. When a subsong contains silence
for the given time, the player will skip to the next subsong. Default value is 2
seconds.
-v Increase verbosity, print more information. Can be applied multiple times.
Default verbosity is 3.
-V Display version number and exit.
-z Play subsongs in shuffle mode. Every subsong will be played once in random order.
-Z Play subsongs in random mode. Like shuffle mode (-z), but a subsong can be played
multiple times.
-1 Mute channel 1 on start.
-2 Mute channel 2 on start.
-3 Mute channel 3 on start.
-4 Mute channel 4 on start.
gbs-file
The sound file to play. Must be in uncompressed .GBS format.
start-subsong
The subsong from the sound file to play first. If not specified, the default song
declared in the sound file will be played unless shuffle (-z) or random mode (-Z)
are active. An out-of-bounds number will be clipped to the possible range of
subsongs.
stop-subsong
gbsplay exits after this subsong has been played. If not specified or
out-of-bounds, gbsplay will exit after playing the last subsong, unless in loop
mode (-l).
KEYBOARD CONTROL
gbsplay supports basic keyboard control. The following commands are recognized:
p Skip to the previous subsong.
n Skip to the next subsong.
q or Esc
Quit gbsplay.
Space Toggle play/pause.
1 Mute/unmute channel 1.
2 Mute/unmute channel 2.
3 Mute/unmute channel 3.
4 Mute/unmute channel 4.
OUTPUT PLUGINS
Output plugins are sometimes called plugouts because that's shorter, so don't be confused.
Not all of the plugins listed here may be available, see `gbsplay -o list'.
alsa Use the ALSA sound driver for sound output.
altmidi
Alternative implementation of the MIDI output plugin (see midi below). Should
export more accurate note off events (the length register is taken into account),
but generated MIDI files will be more complicated and fine grained and probably not
suitable for editing or printing a score.
devdsp Use the OSS sound driver for sound output via /dev/dsp.
dsound Use the DirectSound sound driver for sound output on Microsoft Windows.
iodumper
Dump IO calls to the Gameboy sound hardware to stdout. This reduces the verbosity
to 0 (see -q) because stdout is used for the dumped data.
midi Write a simple MIDI conversion of the song into a separate file per subsong. The
files are called gbsplay-%d.mid, where %d is replaced with the subsong number. The
files are created in the current working directory and existing files are silently
overwritten. Only channels 1 to 3 are converted to MIDI, because channel 4
contains noise data that can't be converted into MIDI note events. Every GBS
channel is exported to a separate MIDI channel. When multiple voices share a
channel, they will not be separated in the output. The conversion is rather basic
and complicated GBS files using tricks and hacks will not be converted properly.
nas Use the NAS sound driver for sound output to a Network Audio Server.
pulse Use the Pulseaudio sound driver for sound output.
sdl Use SDL sound driver for sound output. On Microsoft Windows, libSDL might use the
wasapi audio backend by default which can result in choppy sound. To fix this, set
the environment variable SDL_AUDIODRIVER to directsound to select a different
libSDL audio backend (or switch to the dsound plugout instead).
stdout Dump the raw audio stream to stdout. This reduces the verbosity to 0 (see -q)
because stdout is used for the dumped data. The raw audio is always stereo (2
channels), 16 bit signed PCM. Sample rate and endianness can be set via -E and -r.
FILES
/etc/gbsplayrc
Default location of the global configuration file.
~/.gbsplayrc
User configuration file.
BUGS
If you encounter bugs, please report them via https://github.com/mmitch/gbsplay/issues or
write to <gbsplay-dev@lists.uguu.de>.
AUTHORS
gbsplay was written by Tobias Diedrich <ranma+gbsplay@tdiedrich.de> (with contributions
from others, see README.md).
COPYRIGHT
gbsplay is licensed under GNU GPL v1 or, at your option, any later version.
SEE ALSO
gbsinfo(1), gbsplayrc(5)