Hi,
The append function has this type, if we forget about optional parameters:
append(
source('a),
(([(string*string)])->source('a))
)
->
source('a)
This means that it is a function which takes as arguments :
- a source (to which we want to append a track to every track)
- a function which takes as argument the metadata of the current track and
returns the track to append (this design was chosen so that the appended
track can depend on the current track)
and returns a source.
So, it could be used with something like
s = append(s, fun(m) -> blank(duration=0.1))
The function "fun(m) -> blank(duration=0.1)" simply does not uses its
argument m which contains the metadata of the current track, since we don't
need it here.
Some concepts behind Liquidsoap can be difficult to grasp at first, this is
normal and we are here to help. But generally they have been introduced for
a good reason (in this case, we want to be able to generate the added track
differently for each track), so please keep calm, gentle and patient here,
and usually the issue will be solved quite quickly.
++
Sam.
On Mon, Apr 29, 2013 at 1:59 AM, [email protected] <[email protected]>wrote:
> In an effort to work around the data lost at
> the end of a file encoded to mp3 (Lame)
> I am trying to append a blank to the end
> of my source and have it cut off instead
> of actual sound information, but I cannot
> make heads or tails of the append function
> in the documentation:
>
> append(?id:string,?insert_missing:bool,?merge:bool,source('a),
> (([(string*string)])->source('a)))->source('a)
>
> What would an actual call to this function
> look like? I can only find one example of its
> use (in utils.liq) but I find it equally baffling:
> fun (s,~pattern=p) ->
> append(s,fun (m) -> request.queue(queue=[request.create(pattern % m)],
> interactive=false))
>
> Let's say I have a source:
> source = once(single(argv(1)))
>
> and I want to append 100ms of blank data to it..:
> once(blank(duration=0.1))
>
> What would the append call look like? Is it some kind of queer oCaml thing?
>
> append(merge=true, once(blank(duration=0.1)), source)
> does not work...
>
> source -> append(merge=true, once(blank(duration=0.1)) -> source)
> does not work...
>
> I have no idea what the documentation is trying to say. It just makes no
> sense.
>
> I just wan't to append/merge a bit of blank data to the end of my source.
> Does anybody know how to do that?
> Or does anyone understand the syntax of append?
>
>
>
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