Thanks for your replay, Romain.
Yes I deblieve that what I posed is a simple problem that the liqid soap
langauage could solve. It is, however, only the small core of my program.
In my final product I will have a stream running as a separate process and
responding to updates made via web sevices (presumably passed to the stream
via dbus) at which point the stream will query a sql database to retrieve
any filenames that it should play. The stream is also responsilbe for using
an icecast admin library to check if it is being listened to and also
keeping state for the most recent messages sent, both of which control
whether the stream choses to stop and clean itself up from the icecast
source.
This all seems a bit over complicated for my original post but necessary to
justify why I don't feel like a web radio DSL is appropriate for the task.
Perhaps I am wrong. Liquid soap is surprisingly powerful. Though even if
its capable, ocaml itself might be less work for something this custom.
The underlying libraries in savonet seem like they would be prefect. So the
core of my new project is essentially some object that will be initialized
with a source name and contine to play an audio stream to that source on an
ice cast server.
The object will have a method... playFile, which will add some ogg, mp3, or
wav to the stream and it will have parameter for where in the file to
start, stop, and how long to fade in and out. I should be able to call
playFile again and again and files will be mixed and play on top of each
other.
Clearly I will be implementing (or likely reusing) some scheduler of async
calls like gobjects main loop and timeout_add, ect.
I believe that the afforementioned class at the core of this
eventually-less-simple project will be pretty easy to write using savonet.
I just can't seem to find a library that does mixing of files I would read
from, say, libsndfile easily. Pulseadio, jackaudio, and sdl seem to want me
to buy the whole farm when it comes to those libraries goals. None of which
match my own of stream many random files on top of one another.
I think I'm missing something about these libraries and I'm really hoping
someone here can tell me a library and a few function names that are likely
what I'm looking for here.
Thanks a bunch,
-mike
On Nov 8, 2012 3:04 PM, "Romain Beauxis" <to...@rastageeks.org> wrote:
> Hi Mike!
>
> 2012/11/7 Mike MacHenry <mike.mache...@gmail.com>:
> > I am looking for advice on what libraries from Savonet I can use for a
> > project I'm working on. Here is a simplified version of what I want to
> do.
> >
> > I want to write a program that takes list of ogg, wav, or mp3 files and
> > plays them to an Icecast stream. Files will be randomly selected, played
> not
> > in their entirety but some segment, faded in and out, panned, and many
> files
> > can play at once.
>
> This should all be possible with liquidsoap, although some features
> may require relatively advanced knowledge of the language.
>
> > I found Liquid Soap and Savonet and I think it's probably a great set of
> > libraries for the job. I have been looking around at the various
> documentary
> > pages for the libraries in Savonet and I have been unable to find a
> simple
> > mixer library, which I'm sure must exist.
> >
> > PulseAudio, JackAudo, and SDL all seem like they clearly mix audio, but I
> > think Pulse really needs to interface the Linux sound system, Jack
> requires
> > me to use it to tie together multiple process, and SDL seems to want to
> > connect to audio devices, whereas I want to stream.
> >
> > Does anyone have recommendations on what libraries I should be focusing
> on
> > learning to write something like this? Perhaps one of those three
> actually
> > has all the capabilities I need.
>
> I am wondering why do you need a mixer library for? If by this you
> mean that you want to merge two different tracks into one then this
> should be possible using liquidsoap it self. For instance in the
> following snippet:
>
> # One source
> source1 = (...)
>
> # Another source
> source2 = (...)
>
> # Mix those two sources together
> mixed = add([source1, source2])
>
> Is that what you need?
>
> Romain
>
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