On Wed, Feb 2, 2011 at 11:10 AM, Brandon Casci <[email protected]> wrote:
> I may have got it to work....
Cool. For the record, everything seems to behave as expected. Your
script is roughly like this:
a = input.harbor("foo")
b = request.dynamic({request.create("blah")})
c = fallback([a,b])
output.icecast(%vorbis,mount="foo",c)
Let's see the types:
./src/liquidsoap -c -i test.liq
a : source(audio=2,video=0,midi=0)
b : source(audio=2,video=0,midi=0)
c : source(audio=2,video=0,midi=0)
The stereo type is propagated from the vorbis output to all sources.
Now let's change the last line, putting audio_to_stereo(c) instead of c:
a : source(audio=?#A+1,video=0,midi=0)
b : source(audio=?#A+1,video=0,midi=0)
c : source(audio=?#A+1,video=0,midi=0)
Thanks to the conversion, not everything has to be stereo. Because of
fallback, and the input.harbor, everything under the conversion still
has to have a fixed number of channels. After typing, it is unknown
(?#A+1 means "anything fixed >=1") but before starting streaming it
has to be decided: it will be forced to 2 by default.
Instead of doing that, let's put the conversion directly above the
request source. I'll do it in two definitions so we can see the types:
a = input.harbor("foo")
b = request.dynamic({request.create("blah")})
b = audio_to_stereo(b)
c = fallback([a,b])
output.icecast(%vorbis,mount="foo",c)
./src/liquidsoap -c -i test.liq
a : source(audio=2,video=0,midi=0)
b : source(audio=*+1,video=0,midi=0)
b : source(audio=2,video=0,midi=0)
c : source(audio=2,video=0,midi=0)
We can see that stereo was propagated to most sources. But this time
nothing constrained what's under the conversion to have a fixed number
of channels. So we get a more general solution: *+1 which allows
decoding mono _and_ stereo.
Type inference may look a bit magical, but it's working for you :)
--
David
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