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http://dev.sourcefabric.org/browse/LS-634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=27078#action_27078
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Samuel Mimram commented on LS-634:
----------------------------------
Ok, so I came up with a patch (in branch LS-634). It tries to look at things of
the form a = 5 at lexing time (yeah so this is bound to be a bit messy....) and
replaces the corresponding variables in encoders. It's not perfect but it seems
quite useful to me.
Any comments? Can I merge into trunk? :)
> Allow some variables in encoding formats
> ----------------------------------------
>
> Key: LS-634
> URL: http://dev.sourcefabric.org/browse/LS-634
> Project: Liquidsoap
> Issue Type: New Feature
> Components: Liquidsoap
> Reporter: Samuel Mimram
>
> We should allow some simple variables in encoding formats, otherwise some
> users (airtime) are starting to get an exponential blowup in the size of
> their scripts... I think that an easy solution would be to replace the
> variables by their value at preprocessing time (we don't want to have a value
> environment when doing type inference, so it has to be resolved before that).
> For instance, Martin Konečný reported this on the ML:
> The reason I brought this up, is because currently our code is as follows:
> output_mono = (...)
> output_stereo = (...)
> if type == "mp3" then
> if bitrate == 24 then
> if stereo then
> ignore(output_stereo(%mp3(bitrate = 24, stereo = true),
> !source))
> else
> ignore(output_mono(%mp3(bitrate = 24, stereo = false),
> mean(!source)))
> end
> elsif bitrate == 32 then
> if stereo then
> ignore(output_stereo(%mp3(bitrate = 32, stereo = true),
> !source))
> else
> ignore(output_mono(%mp3(bitrate = 32, stereo = false),
> mean(!source)))
> end
> elsif bitrate == 48 then
> if stereo then
> ignore(output_stereo(%mp3(bitrate = 48, stereo = true),
> !source))
> else
> ignore(output_mono(%mp3(bitrate = 48, stereo = false),
> mean(!source)))
> end
> Multiply for all bitrates up to 320kbps, then once again for %vorbis, and
> then once again for shoutcast :)
> Right now it's not so bad, but in the future if we add one more user
> customizable variable, it would be wiser to use a code generator :)
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