Le mercredi 17 mars 2010 14:45:56, jonas ohrstrom a écrit :
> dear mailing-list, hey all!
Hi !
> first thanks for the nice liquidsoap project - really like the approach! i
> just installed it and made a simple control script and some tests with
> exporting playlists from an existing project. everything great so far.
Thanks !
> what i actually want to ask here - before really starting analyzing the
> code - is, if it would be possible to implement a way to use queue-points
> and custom fades in the playout part. i'm working as a developer for a
> community-based radio project - openbroadcast.ch (and as well for a
> netlabel platform, sonicsquirrel.net). one of the functionality that
> should be available when creating playlists is, that custom start-, end
> and fades can be used. for example a track with a length of say 3:45:678
> should start at 0:10:000, fade in during 2sec and fade-out 4sec at
> 3:35:432
>
> i assume this functionality is not yet implemented in liquidsoap (although
> i came across the smil format in the xml-playlist module, and smil
> incorporates some of these controls). so my question is more if someone
> has an idea about how difficult it would be to add such a behavior to the
> playout, what issues could arise etc, and what would be a way to start
> doing so.
>
> any help would be really appreciated
Indeed, this functionality is not yet implemented.
But I believe it can be :-)
The main concern is that liquidsoap performs in real-time. As such, it is not
made to skip part of a file.
However, liquidsoap can be extended with various protocols for handling
requests. For instance, there is a replaygain: protocol that adds a replaygain
information in the file's metadata.
Similarly, it should be possible to use external cutting tools for mp3,
vorbis, ... and define a protocol that would cut the requested file before
passing it to liquidsoap.
I have looked around, it seems that for mp3, the quelcom package in debian
contains a qmp3cut tool that should fit for mp3, and the vorbis-tools package
contains a vcut tool for ogg/vorbis files that should fit too.
If you want to see how the replaygain: protocol is implemented, you can look
there for the documentation:
http://savonet.sourceforge.net/doc-svn/replay_gain.html
and there for the implementation:
http://savonet.rastageeks.org/browser/trunk/liquidsoap/scripts/utils.liq#L484
The only limitation I see for now is that this may only work for local files
and not for files fetched using ftp:// of http://..
If you want, you can open a feature request ticket on our trac:
http://savonet.rastageeks.org/
So we can discuss the feature there and track its implementation..
Have a good day!
Romain
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