@node configuration
@chapter Configuration
@section ocp.ini
OCP can be widely configured using the @file{ocp.ini} file, which should
reside in the home directory ($HOME/.ocp/ocp.ini). This file is
processed at every startup and informs the player about various
modules / plugins and their respective configuration. For average
users the default configuration should be sufficient. However if you
want to change certain aspects of the player permanently you have to
modify this file. You can use any text editor to edit the ini file.

The @file{ocp.ini} consists of many sections. Each section starts
with a section identifier tag in square brackets [ ]. Examples of
sections are @ref{configuration, [general]} or
@ref{configuration, [sound]}. The sections id tag should be followed by
a newline. After a section has been declared with the id tag the options
describing the sections follow. Each options takes a single line and
consists of a keyword followed by a ``='' and the parameters. Example:
@example
mixrate=44100
@end example

All options following a section id are options for that section. If a
new section starts with a id tag all forthcoming options are assigned
to the new section. All options for a section have to be grouped
together. Multiple declarations of sections are not valid.
@example
[general]
  link=dos4gfix
[defaultconfig]
  link=mchasm
[general]
  dos4gfix=off
@end example
the above example has to be written as:
@example
[general]
  link=dos4gfix
  dos4gfix=off
[defaultconfig]
  link=mchasm
@end example
@smallformat
Note that in the above example the option @emph{link} has not
been overridden by the @emph{defaultconfig} section. Both sections now
can access an options named @emph{link}, but both options are totally
independant of each other.
@end smallformat

Comments can be placed anywhere in the configuration file and are
marked by a @emph{;}. The rest of the line starting from the
@emph{;} is considered as a comment and not processed.

When modifying the configuration you should always start with the
default configuration file and configure it to your needs. Building a
bug free config file from scratch is difficult. @footnote{And remember
to make backups before changing vital parts of the @file{ocp.ini}}

We will now have a look at the individual sections and their options.

@section [general]
The @emph{general} section describes which internal modules or plugins to load
at startup. The required modules for for normal operation of OCP is placed in a
special directory, causing them to be automatically loaded. All options listed
in this section are loaded every time OCP starts!
@emph{general} section looks like:
@example
[general]
;  link=
;  prelink=
;  datapath=     ; path to opencp's pictures and animations.
;  tempdir=

@end example

@multitable @columnfractions .3 .7
@item link @tab
this options describes the modules to load when starting OCP.
There is no need to change this option, unless you have coded a basic
internal module.
@item datapath @tab
OCP searches for background pictures and animations in its
system directory. If you want to store your artwork at a different place
use this option to set the right directory.
@item tempdir @tab
this directory is used for extracting modules from archives.
If you have set a DOS environment variable called either @emph{TEMP}
or @emph{TMP} these will be used.
@end multitable

@section [defaultconfig]
The @emph{defaultconfig} section is very similar to the @emph{general}
section. But unlike the @emph{general} section which is always
processed the settings in the @emph{defaultconfig} section can be
ommited with an alternative section and the @emph{-c} flag from the
command line. If the @emph{-c} flag is not present the
@emph{defaultconfig} section will be processed.@footnote{Therefore it
was named @emph{defaultconfig}...}

@example
[defaultconfig] ; default configuration
  link=medialib
;  prelink=
@end example

@multitable @columnfractions .2 .8
@item link @tab
just like in the @emph{general} section this option defines which
modules should be loaded at startup. You can delete some entries if
you will not need them -- however this is not recommended as they do
not use much memory and do not require any processor power.
@item prelink @tab
these files will be loaded before starting the main module. If
something goes wrong here OCP will continue to work.
@end multitable

@section [sound]
This section is the most important one for using OCP. If you want to
change the configuration permanently you have to modify the entries of
this section.

@example
[sound]
  playerdevices=devpALSA devpOSS devpCA devpSDL2 devpSDL devpNone devpDisk
  wavetabledevices=devwMixF devwmixQ devwMix devwNone
  mixrate=44100
  mixprocrate=4096000
  plrbufsize=200
  samprate=44100
  defwavetable=
  itchan=64
  cdsamplelinein=off
  bigmodules=devwMixF
  amplify=100
  panning=100
  volume=100
  balance=0
  reverb=0
  chorus=0
  surround=off
  filter=2
@end example

@multitable @columnfractions .3 .7
@item playerdevices @tab
OCP uses three different devices to communicate with the
hardware. The @emph{playerdevices} are used to play a stream of
samples. As all sound cards support this feature you will find
@emph{playerdevices} for every sound card supported by OCP. This
device is needed for playing @file{.ogg}, @file{.wav} and
@file{.mp3} files and if you want/have to use the software
(quality) mixer. OCP searches for all devices listed in this option
at startup and only those found are actually loaded. You can delete
all devices you have not installed to speed up to startup
procedure. If you have multiple sound cards installed be sure to list
all devices if you want to use more than one sound card.@footnote{you
can change devices by using the special
@file{setup:} drive described in section @xref{fileselector}.} If more
than one device is listed the first in the list will be used as default.
@item wavetabledevices @tab
for mixing several channels you have to use
@emph{wavetabledevices}. Most sound cards are only able to play to channels
simultaneously normally assigned to the left and right channel or your
home stereo. The @emph{mixer} devices are used to mix the sample data
of module files to those two channels. However modern sound cards have
special hardware to mix channels ``onboard''. But all hardware mixers
have a maximum amount of channels to mix@footnote{mostly 32
channels}. Especially @file{.it} files often use more than 32
channels so an errorfree playback can not be guaranteed when using
hardware mixing. You should include one of the software mixers for
this case.
@item mixrate @tab
the default mixrate. Unless you have a very old sound
card@footnote{SoundBlaster 1.x or SoundBlaster Pro and compatibles} or
a very old processor@footnote{Something like 386SX} there is no need
to change this option.
@item mixprocrate @tab
if you have a slow cpu@footnote{@emph{<}486DX} you might
not be able to play 32 channels at full mixrate. This value defines
the maximum ``calculation power'' to which OCP tries to use the full
mixrate.
@item plrbufsize @tab
When running in a multitasking environment there is no
guarantee for constant cpu resources. To avoid a break in the sample
stream OCP will calculate in advance. This option sets the buffer lenth in
miliseconds.
@item samprate @tab
When using diskwriter, this value will be used.
@item defwavetable @tab
this option sets the default @emph{wavetabledevice}. Can
also be set with @emph{-sw} command.
@item itchan @tab
the @file{.it} format can play more than one sample per channel
simultaniously. A maximum number of channels to mix is required for
this file type too. When playing @file{.it} files using a hardware
mixer the maximum number of channels is again limited to the hardware.
@item cdsamplelinein @tab
If you select a @file{.cda} file the cd input of your
sound card is used to sample the current music. If you do not have a
cd input or if you have connected your cd-rom to the line-in jack
enable this option to change to sample input.
@item bigmodules @tab
This option is of interest for users of hardware mixing
devices only. Sound cards capable of mixing channels are not only
limited by the amount of channels played simultaniously, but by the
amount of onboard memory to store the sample data too. If files are
marked as ``big'' in the fileselector this device listed in this
option will be used for mixing this module.@footnote{See section
@pxref{fileselector, bigmodules} for details about this feature}
@item amplify @tab
the default amplification to use within the player. The
following options are described in section @pxref{player, General} in
detail. The command line option @emph{-va} overrides this option.
@item panning @tab
the default panning (command @emph{-vp})
@item volume @tab
the default volume (command @emph{-vv})
@item balance @tab
the default balance (command @emph{-vb})
@item reverb @tab
some sound cards have an onboard effect processor @footnote{currently
the SoundBlasterAWE and the TerraTecEWS} which features a reverb
effect. This option controls the intensity of the onboard
effect. (command @emph{-vr})
@item chorus @tab
dito as reverb (command @emph{-vc})
@item surround @tab
this options controls the fake surround effect @footnote{this
has little to do with real Dolby Surround although there should be a
certain effect if you have such an amplifier} (command @emph{-vs})
@item filter @tab
The software mixer can use a software filter to enhance the
playback quality. Different algorithms can be used. (command
@emph{-vf})
@itemize
@item 0     - no filter
@item 1 AOI - only filter samples when filtering is necessary
@item 2 FOI - filter every sample even if filtering has no effect
@end itemize
@end multitable

@section [screen]
When the player starts it will use the options in this section as the
initial appearance.

@example
[screen]
  usepics=*.gif *.tga
  compomode=off
  startupmode=text
  screentype=7
  analyser=on
  mvoltype=1
  pattern=on
  insttype=0
  channeltype=1
  palette=0 1 2 3 4 5 6 7 8 9 a b c d e f
  fps=20
@end example

@multitable @columnfractions .3 .7
@item
usepics
@tab
When using graphics modes you can use a picture to show in the
background. OCP will load any TGA files with 640x384 dimensions and
256 colors.  As the TGA format is poorly implemented in modern graphic
programs this might change in the future. As some colors out of the
256 are used by OCP you should leave either the first or the last 16
colors in the palette black. The pictures should be copied to the
home directory of ocp, unless you specify a different location in the
@emph{defaultconfig} section.
@item compomode @tab
this option will enable the compo mode. Section
@pxref{player, Using the Compo mode} describes the details.
@item startupmode @tab
start the player in either text or graphic mode:
@itemize
@item coolhelp - show help screen
@item dots - show note nots
@item graph - show graphical spectrum analyzer
@item links - show currenty linked DLLs/shared libraries
@item msg - show module message
@item phase - show phase analyzer
@item scope - show oscilloscopes
@item text - show standard text screen
@item wuerfel2 - show animation
@end itemize
@item screentype @tab
the default screentextmode:
@itemize
@item 0 - 80x25
@item 1 - 80x30
@item 2 - 80x50
@item 3 - 80x60
@item 4 - 132x25
@item 5 - 132x30
@item 6 - 132x50
@item 7 - 132x60
@end itemize
@item analyzer @tab
if the player starts in textmode show the analyzer (or not)
@item mvoltype @tab
the appearance of the peak power levels:
@itemize
@item 0 - none
@item 1 - big
@item 2 - side (only in 132 column modes)
@end itemize
@item pattern @tab
show the tracklist when starting OCP in textmode
@item insttype @tab
the appearance of the instrument function:
@itemize
@item 0 - none
@item 1 - short
@item 2 - long
@item 3 - side (only in 132 column modes)
@end itemize
@item channeltype @tab
the appearance of the channels in textmode:
@itemize
@item 0 - none
@item 1 - short
@item 2 - long
@item 3 - side (only in 132 column mode)
@end itemize
@item palette @tab
with this options you can redefine the default colors used in
textmode. The first entry defines which color to use for the original
color with number 0. Leave things as they are if you are satisfied
with the visual appearance of OCP. We will provide new color schemes
in the future.
@item fps @tab
This tells how many frames per second OCP should try to use, since UNIX
isn't a real-time system, this is needed.
@end multitable

@section [fileselector]
Except the first two options all options can also be specified at
runtime by pressing @key{ALT}+@key{z} in the fileselector.

@example
[fileselector] ; default fileselector section
  modextensions=M15 M31
  movepath=  ; default path to move files
  screentype=2
  typecolors=on
  editwin=on
  writeinfo=on
  scaninarcs=on
  scanmnodinfo=on
  scanarchives=on
  putarchives=on
  playonce=on
  randomplay=on
  loop=on
  path=.
@end example

@multitable @columnfractions .3 .7
@item
modextensions
@tab
files containing these extensions will be scanned by the
fileselector in addition to those automatically added by
the playback plugins. Only these files will be shown. If
you want to load files with different extensions you have
to specify them at the command line.
@footnote{however files with different extensions are
likely to be no valid module format, so they will be refused to load}
@item movepath @tab
the standard path to move files into. This is describend in
section @xref{fileselector, Advanced usage}.
@item screentype @tab
the textmode to use within the fileselector. The options are
the same as in the @emph{screen} section.
@item typecolors @tab
show files in different colors depending on the file type
@item editwin @tab
show the edit window at the bottom of the screen
@item writeinfo @tab
write the info to the information database located in the
home directory of OCP. This speeds up the processing of directories,
as files have to be scanned only once.
@item scanmodinfo @tab
scan inside the music files for module information.
@item scanarchives @tab
if archives (like @file{.zip} or @file{.rar}) are
found in the current directory the are scanned for modules.
@item putarchives @tab
show archives in the fileselector, so they can be used just
like subdirectories.
@item playonce @tab
play every file only once (thus not looping it) and then
procede with the next file in the playlist. If the file contains a
loop command the loop command is ignored.
@item randomplay @tab
play files in the playlist in random order.
@item loop @tab
loop files after the end.
@item path @tab
the default path to use when starting the fileselector the first
time. The default is the current directory (.). If you keep all your
music files in one directory you can specfiy this directory here.
@end multitable

@section device configuration
The following sections define the various devices for the
player. Unless you really know what to do you should not change the
following options. As most entries are similar only some educational
examples are listed here. For a complete reference have a look at your
personal @file{ocp.ini} file for details.

The general form of a device looks like:
@example
[handle]
  path=...
  mixer=...
@end example

The internal name to use within the player. The @file{ocp.ini}
file must contain all @emph{handles} listed in the devices options of
the @emph{devices} section.

The next subsections will look at the special features the different
sound cards and drivers support. The original order of the
@file{ocp.ini} has been slightly modified for the purpose of
documentation.

@subsection ALSA
ALSA is the modern sound architecture in Linux that can give direct access to
sound hardware. For many modern systems, the default output driver might be a
virtual sound card like PulseAudio making it possible for the desktop volume
applet to adjust volume per application.
@example
[devpALSA]
  card=default
  mixer=default
@end example


@subsection CA
CoreAudio is the sound arcitecture for MacOS / OSX. The current state of this
driver might be non-working, as the main developer do not have access to the
given hardware. Testing/patching are welcome.

@example
[devpCA]
@end example

@subsection OSS
Open Sound System is the common legacy sound API for most unix systems. This
driver should work on most unix-like operating systems like different variants
of BSD, old versions of Linux, etc.

@example
[devpOSS]
  revstereo=on
  path=/dev/dsp
  mixer=/dev/mixer
@end example

@subsection SDL / SDL2
SDL/SDL2 is a cross-platform library that gives a common simple API for
playing audio, hiding the underlaying operating system. This library will work
on almost all systems.

@multitable @columnfractions .3 .7
@item path @tab
where /dev/dsp is located. If you have more soundcards, this can be set to for
instance /dev/dsp3. You can override config with the DSP environment variable.
@item mixer @tab
what mixerdevice to use. Override with the MIXER environment variable.
@end multitable

@subsection SDL/SDL2
SDL/SDL2 is a cross-platform library that gives a common simple API for
playing audio, hiding the underlaying operating system. This library will work
on almost all systems.

@example
[devpSDL]

[devpSDL2]
@end example

@subsection diskwriter
OCP can write all sound output directly to hard disk. Data is written in
standard @file{.wav} format. You can use this feature to burn audio
cds from any sound format supported by OCP.

Although you can write @file{.wav} files in every possible sample
format you should not alter the default of 44100KHz, 16bit,
stereo. You should disable module looping so each module is written
once onto harddisk. You can disable looping in the @file{ocp.ini}
with the directive @emph{loop=on} in the @pxref{fileselector}
section. You can also change looping temporarily with the
fileselector configuration while OCP is running. See the
fileselector advance usage @pxref{fileselector, Advanced usage} for details.

To enable the diskwriter device you can change the @file{ocp.ini} file
and select the @emph{devpDisk} as default device by moving it to the
start of the @pxref{configuration, playerdevices} directive in the @pxref{configuration, [sound]}
section. You can also select the @emph{devpDisk} device temporarily
by selecting the @file{setup:/DEVICES/DEVPDISK.DEV} device.

Now simply start OCP and select a module to play. You will hear no output
and notice that the module is played with maximum speed@footnote{depending
on your cpu power}. In the directory where you have started OCP (not
necessaryly the directory where the module is located) subsequent
@file{.wav} files named after the original filename will be created.

@example
[devpDisk]
  stereo=on
  16bit=on
@end example

@subsection software mixers
By default OCP will use its own routines for mixing several channels
to the two stereo output channels. You have the choice between to
mixers. The normal mixer is faster in calculating, thus can mix more
channels at the same time.  The quality mixer however produces better
sound ouput. For average modules and a pentium processor the quality
mixer should be fast enough for sufficient playback. If many channels
are used you may have to change back to the normal mixer @footnote{You
can toggle by using the @emph{bigmodule} feature described in
@xref{fileselector, bigmodules}.}

Both mixers take identical options. As the mixers will be rewritten in
the future the options are likely to change. Therefore they are not
documented here. Please have a look at future versions of this
document if you want to change to mixer settings. However these
devices never have caused any trouble/bugs and there should be no need
for change.

@example
[arcACE]
  get=ace32 e %a %n %d
  scaninsolid=false
@end example
@multitable @columnfractions .3 .7
@item scaninsolid @tab
scan in solid archives. As this takes more time you can
disable this feature.
@end multitable

@section Filetypes
The @file{ocp.ini} file contains descriptions for all supported file
types. These features will be included in the file loader devices in
the next version of OCP, so these options will soon be obsolete. There
should be no need to modify any of the file types.
