## 5 Configuration

### 5.1 ocp.ini

OCP can be widely configured using the `ocp.ini` file, which should reside in the home directory of the player itself. 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 every ascii editor to edit the ini file.

The `ocp.ini` consists of many sections. Each section starts with a section identifier tag in square brackets [ ]. Examples of sections are [general] or [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:

         mixrate=44100

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.

         [general]
           link=dos4gfix
         [defaultconfig]
           link=mchasm
         [general]
           dos4gfix=off

the above example has to be written as:

         [general]
           link=dos4gfix
           dos4gfix=off
         [defaultconfig]
           link=mchasm

    Note that in the above example the option link has not
    been overridden by the defaultconfig section. Both sections now
    can access an options named link, but both options are totally
    independant of each other.

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

Normally the definition for an option ends with the end of the line. If many parameters are needed to specify an option they may exceed the default line width of 80 characters. Although this is no problem for OCP it is not nice looking. You can extend a line logically by using the unix like backquote at the end of a line to begin a newline without interupting the current option definition.

         [example]
           option1=parameter1 parameter2
           option2=parameter1 \
                   parameter2

Both options contain exactly the same parameters.

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. 1

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

### 5.2 [general]

The general section describes which internal modules or plugins to load at startup. Most of them are required for normal operation of OCP so you should not remove any of the contents. All options listed in this section are loaded every time OCP starts! The default general section looks like:

         [general]
           link=cpiface cphlpif fstypes
           prelink=framelock pfilesel

link | 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.
datapath | OCP searches for background pictures and animations in its home directory. If you want to store your artwork at a different place use this option to set the right directory.
tempdir | this directory is used for extracting modules from archives. If you have set a DOS environment variable called either TEMP or TMP these will be used.

### 5.3 [defaultconfig]

The defaultconfig section is very similar to the general section. But unlike the general section which is always processed the settings in the defaultconfig section can be ommited with an alternative section and the -c flag from the command line. If the -c flag is not present the defaultconfig section will be processed.2

         [defaultconfig] ; default configuration
           link=devi plrbase mcpbase smpbase arctar mixclip medialib cdrom
           prelink=poutput hardware cphelper sets mchasm compat

link | just like in the 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.
prelink | these files will be loaded before starting the main module. If something goes wrong here OCP will continue to work.

### 5.4 [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.

         [sound]
           playerdevices=devpOSS devpNone devpDisk
           samplerdevices=devsOSS devsNone
           wavetabledevices=devwMixF devwmixQ devwMix devwNone
           mixrate=44100
           mixprocrate=4096000
           mix16bit=on
           mixstereo=on
           plrbufsize=200
           mixbufsize=200
           samprate=44100
           samp16bit=on
           sampstereo=on
           smpbufsize=2000
           defplayer=
           defsampler=
           defwavetable=
           midichan=64
           itchan=64
           cdsamplelinein=off
           bigmodules=devwMixF
           wavetostereo=1
           waveratetolerance=50
           amplify=100
           panning=100
           volume=100
           balance=0
           reverb=0
           chorus=0
           surround=off
           filter=2

playerdevices

OCP uses three different devices to communicate with the hardware. The playerdevices are used to play a stream of samples. As all sound cards support this feature you will find playerdevices for every sound card supported by OCP. This device is needed for playing `.ogg`, `.wav` and `.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.3 If more than one device is listed the first in the list will be used as default.

samplerdevices | these devices are the least important ones. They are only needed if you want to use OCP when playing cd audio tracks or start the player in sample mode. The sample data is not calculated from files, but sampled from either the cd, line or microphone jack of the sound card. You can then use the graphical screens to view the sounds.

wavetabledevices

for mixing several channels you have to use 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 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 mix4. Especially `.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.

mixrate | the default mixrate. Unless you have a very old sound card5 or a very old processor6 there is no need to change this option.
mixprocrate | if you have a slow cpu7 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.
mix16bit | Leave this option enabled unless you have a 8bit sound card.
mixstereo | dito for stereo cards
plrbufsize | When using a playerdevice to play sample streams a DMA buffer is used to minimize cpu resources for handling the sample stream. This option sets the DMA buffer length in miliseconds.
mixbufsize | 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.
samprate | When using a samplerdevice this value will be used.
samp16bit | dito
sampstereo | dito
smpbufsize | this options sets the length of the sample DMA buffer in miliseconds.
defplayer | with this option you can override the default playerdevice. Normally you don't need to set this option, as the default device can also be set by the order in the playerdevice option. This option can also be specified by using the -sp options from command line.
defwavetable | this option sets the default wavetabledevice. Can also be set with -sw command.
defsampler | the same as the -ss command line option.

midichan

unlike the module file types the MIDI file format does not specify the exact amount of channles to use. Complex `.mid` files can easily try to play several dozens of channels simultaniously. This option sets the maximum amount of channels to mix when playing `.mid` files. Note that this value has no effect when a hardware mixing device is used, as the maximum number is limited by the hardware.

itchan | the `.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 `.it` files using a hardware mixer the maximum number of channels is again limited to the hardware.
cdsamplelinein | If you select a `.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.
bigmodules | 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.8
wavetostereo | When playing a mono wave the sound card can either be switched to mono mode or the wave can be played as a stereo file.9
waveratetolerance | if the sample rate of the wave file is not equal to a sample rate supported by your sound card, OCP will not resample unless this value is exceeded. Divide the value by 1000 to get the percentage.
amplify | the default amplification to use within the player. The following options are described in section see General in detail. The command line option -va overrides this option.
panning | the default panning (command -vp)
volume | the default volume (command -vv)
balance | the default balance (command -vb)
reverb | some sound cards have an onboard effect processor 10 which features a reverb effect. This option controls the intensity of the onboard effect. (command -vr)
chorus | dito as reverb (command -vc)
surround | this options controls the fake surround effect 11 (command -vs)

filter

The software mixer can use a software filter to enhance the playback quality. Different algorithms can be used. (command -vf)

- 0 - no filter
- 1 AOI - only filter samples when filtering is necessary
- 2 FOI - filter every sample even if filtering has no effect

### 5.5 [screen]

When the player starts it will use the options in this section as the initial appearance.

         [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

usepics

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 defaultconfig section.

compomode | this option will enable the compo mode. Section see Using the Compo mode describes the details.

startupmode

start the player in either text or graphic mode:

- coolhelp - show help screen
- dots - show note nots
- graph - show graphical spectrum analyzer
- links - show currenty linked DLLs/shared libraries
- msg - show module message
- phase - show phase analyzer
- scope - show oscilloscopes
- text - show standard text screen
- wuerfel2 - show animation

screentype

the default screentextmode:

- 0 - 80x25
- 1 - 80x30
- 2 - 80x50
- 3 - 80x60
- 4 - 132x25
- 5 - 132x30
- 6 - 132x50
- 7 - 132x60

analyzer | if the player starts in textmode show the analyzer (or not)

mvoltype

the appearance of the peak power levels:

- 1 - big
- 2 - small

pattern | show the tracklist when starting OCP in textmode

insttype

the appearance of the instrument function:

- 0 - short
- 1 - long
- 2 - side (only in 132 column modes)

channeltype

the appearance of the channels in textmode:

- 0 - short
- 1 - long
- 2 - side (only in 132 column mode)

palette | 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.
fps | This tells how many frames per second OCP should try to use, since UNIX isn't a real-time system, this is needed.

### 5.6 [fileselector]

Except the first two options all options can also be specified at runtime by pressing <ALT>+<z> in the fileselector. However to make changes permanent you have to modify the fileselector section.

         [fileselector] ; default fileselector section
           modextensions=MOD S3M XM IT MDL DMF ULT AMS MTM 669 NST WOW \
                         OKT PTM MXM MID WAV RMI MP1 MP2 MP3 OGG SID DAT \
         		PLS M3U PLT OGG
           movepath=  ; default path to move files
           screentype=2
           typecolors=on
           editwin=on
           writeinfo=on
           scanmdz=on
           scaninarcs=on
           scanmnodinfo=on
           scanarchives=on
           putarchives=on
           playonce=on
           randomplay=on
           loop=on
           path=.

modextensions | files containing these extensions will be scanned by the fileselector. Only those files will be shown. If you want to load files with different extensions you have to specify them at the command line.12
movepath | the standard path to move files into. This is describend in section See Advanced usage.
screentype | the textmode to use within the fileselector. The options are the same as in the screen section.
typecolors | show files in different colors depending on the file type
editwin | show the edit window at the bottom of the screen
writeinfo | 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.
scanmdz | if `.mdz` files are found in the current directory, they will be scanned and the included information used.
scanmodinfo | scan inside the music files for module information.
scanarchives | if archives (like `.zip` or `.rar`) are found in the current directory the are scanned for modules.
putarchives | show archives in the fileselector, so they can be used just like subdirectories.
playonce | 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.
randomplay | play files in the playlist in random order.
loop | loop files after the end.
path | 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.

### 5.7 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 `ocp.ini` file for details.

The general form of a device looks like:

         [handle]
           link=...
           subtype=...
           port=...
           port2=...
           irq=...
           irq2=...
           dma=...
           dma2=...
           bypass=...
           keep=...

handle | The internal name to use within the player. The `ocp.ini` file must contain all handles listed in the devices options of the devices section.
link | the name of the dll function this device will be linked to.
port(2) | the primary/secondary port of the sound card. This value has to be given in hexadecimal with preceeding 0x or appending h!
irq(2) | the primary/secondary IRQ of the sound card
dma(2) | the primary/secondary DMA channel of the card
bypass | skip the autodetection if it may encounter problems
keep
keep the driver resident in memory, even it is not currently needed. |

Most device functions of the standard dll contain autodetection routines for the supported sound cards, so there is normally no need to specify any of the port, irq or dma options. However if OCP is not able to detect your sound cards settings you can try to insert the appropriate values in the configuration file.

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

#### 5.7.1 OSS

Open Sound Sysstem is a generic portable UNIX sound interface for playing/recording pcm data, and adjusting mixer settings.

         [devpOSS]
           link=devposs
           revstereo=on
           path=/dev/dsp
           mixer=/dev/mixer

         [devsOSS]
           link=devsoss
           revstereo=on
           path=/dev/dsp
           mixer=/dev/mixer
           igain=1

path | 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.
mixer | what mixerdevice to use. Override with the MIXER environment variable.
igain | if you don't input from cdrom, try to set igain. With this option, you can automatically set igain to a given value (or -1 for not touching it)

#### 5.7.2 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 13

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.

### 5.8 archivers

When processing files inside archives OCP has to know how to call the programs. The following sections define the usage of different archivers supported by the OCP fileselector.

When substituting the command line 4 special variables are processed by the fileselector for accessing the archives:

%% | evaluates to “%”
%a | evaluates to the archiv name preceeded by the path to process.
%n | evaluates to the filename of the file to process inside the archive.
%d | evaluates to the destination directory used to extract files out of archive.

Three default command are defined for the arc modules:

get | this command is used when a file should be extracted out of an archive.
put | if a file should be added to the archive this command line is used.
delete | with <ALT>+<k> you can delete files out of archives.

The following two archivers contain special options described below:

         [arcZIP]
           get=pkunzip %a %d %n
           put=pkzip %a %n
           delete=pkzip -d %a %n
           deleteempty=on

deleteempty | the program pkzip/pkunzip used by OCP to process `.zip` files have a bug when deleting the last file inside an archive. An empty archive of 22 bytes is left on the hard disk. With this option enabled the fileselector will delete those “zip zombies”.

         [arcACE]
           get=ace32 e %a %n %d
           scaninsolid=false

scaninsolid | scan in solid archives. As this takes more time you can disable this feature.

### 5.9 Filetypes

The `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.

### 5.10 MIDI

If you want to hear MIDI music you need samples for the general midi instrument set.14 This secion contains the paths to the midi patches. Section see MIDI files describes how to set up OCP for midi playback. For use of timidity, `/etc/timidity.cfg` must be configured.

         [midi]
           use=....  to force which option to use [ultradir fff freepats timidity]
           fff=c:\iw\gsfull4m.fff
           ultradir=/home/user/ultradir
           freepats=/usr/local/share/freepats

use | if you want to force usage of a specific patch-system, set this variable to one of these values: ultradir fff freepats timidity
fff | path where the fff font is located
ultradir | path where ULTRADIR.INI is stored. Please checkout `ultrafix.sh` for fixing cases in filenames.
freepats | path to where freepats is located

#### Footnotes

[1] And remember to make backups before changing vital parts of the `ocp.ini`

[2] Therefore it was named defaultconfig...

[3] you can change devices by using the special `setup:` drive described in section See fileselector.

[4] mostly 32 channels

[5] SoundBlaster 1.x or SoundBlaster Pro and compatibles

[6] Something like 386SX

[7] <486DX

[8] See section see bigmodules for details about this feature

[9] switching the soundcard may cause problems so enable this option.

[10] currently the SoundBlasterAWE and the TerraTecEWS

[11] this has little to do with real Dolby Surround although there should be a certain effect if you have such an amplifier

[12] however files with different extensions are likely to be no valid module format, so they will be refused to load

[13] You can toggle by using the bigmodule feature described in See bigmodules.

[14] a so called midi patch set