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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