I don't have a linux environment handy to test this on, but the recent
versions of the plugin perl script begain to be structured in a way
should make at least a minimal linux/brutefir implementation reasonably
straightforward. Here a few notes on the bits you'll need to change to
move in that direction.
Looking at "plugin.pm" version 0.9.9:
#52: use Win32;
(now I wish I'd specified qw/ exactly which Win32 package methods are
called. Anyhow; this line obviously needs to go away in a linux
version).
#75: my $convolver = "InguzDSP";
(change to "brutefir")
#153: return ($::VERSION ge '6.1') && Slim::Utils::OSDetect::OS() eq
'win';
(well, duh, change that)
160: my $appdata = Win32::GetFolderPath(Win32::CSIDL_COMMON_APPDATA);
(this returns the windows path for \Documents and Settings\All
Users\Application Data\ under which the InguzEQ\ folder is created -
this is where all the config stuff is saved to disk by the plugin and
read by the dsp.)
('mkdir' in the rest of that sub I think is part of the Win32::
package)
#970: [$CONVAPP$] -d 16 -id "$CLIENTID$" -r $RATE$
(from line 964 onward - the various transcode blocks pipe the audio
stream through the $CONVAPP$ process. The other flags are commandline
parameters telling my dsp how to process the audio. The important
flags below:)
-id <xx>: ID of the squeezebox, see below.
-d <nn>: number of bits per sample in the convolver's output stream.
-r <nn>: number of samples per second (44100, usually)
-wav: flag saying to expect a WAV file header instead of raw PCM
-input <xx>: read input from a file instead of stdin
-be: flag saying to expect big-endian data instead of little-endian
The main flag a brutefir implementation will need some thought around
is the "-id" flag. The value after this is the MAC address of the
squeezebox which is playing the current stream. This ID is used to
find a configuration file "<id>.settings.conf" in the
$pluginSettingsDataDir directory. (see 'sub getPrefFile'). That
settings file (xml) is where all the stuff like EQ bands, the path to
the currently selected impulse file, and so on. Of course a trivial
implementation supporting only one squeezebox per server doesn't need
that flag quite so much - you could hardcode the filter path and so
on...
--
inguz
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