Romain,
Thank you. This is invaluable information and I didn't think to look at
the source but I would have gotten lost in it, if not more confused. Is
there any reason this exact approach would not work if I've converted these
to .mp3? Some of the audio has a hum on it so I am using the conversion
to mp3 to run a highpass filter.
I'm using the file socket to do a queue.push /path/to/file - I will try this
On Wed, Mar 22, 2017 at 2:50 PM, Romain Beauxis <[email protected]>
wrote:
>
>
> 2017-03-21 16:44 GMT-05:00 Jeff Garvas <[email protected]>:
> >
> >
> > On Tue, Mar 21, 2017 at 12:54 AM, Romain Beauxis <[email protected]>
> > wrote:
> >>
> >> 2017-03-20 14:23 GMT-05:00 Jeff Garvas <[email protected]>:
> >> >
> >> > I'm using liquidsoap for an unconventional use case where I
> >> > predominantly
> >> > stream silence, and inject very short audio files sourced from a
> police
> >> > scanner.
> >>
> >> Well, that certainly is an interesting usage!
> >
> >
> > It's working quite well. When the application that generates a .mp3
> file
> > writes the file it runs a script I wrote that connects to the socket and
> > queues the mp3 file. Liquidsoap is pointed to a mount point at
> > http://broadcastify.com.
> >
> >> > Here is the challenge I have -- I want to be able to include a
> >> > StreamTitle=
> >> > in the streaming payload immediately prior to adding a new track to
> the
> >> > queue. I ran a packet capture on windows based application that
> >> > supports
> >> > alpha tagging and in the payload itself of the mp3 stream there is a
> >> > StreamTitle= immediately prior to the begining of a new mp3 audio
> source
> >> > (when transitioning from silence)
> >>
> >> By StreamTitle, I assume that you mean to set the track's metadata, like
> >> artist or title as they are later sent via output.icecast etc.
> >
> >
> > Yes - but I literally mean StreamTitle. I did a packet capture of
> another
> > application that does this called RadioFeed, where you use an audio
> cable to
> > feed a sound card and a serial cable to get the "alpha tag" of the
> channel
> > from the scanner itself. If you look at the packet capture the alpha
> tag of
> > the channel (say, "PD Dispatch") is in the payload like this:
> > StreamTitle=PD%20Dispatch (i think the %20 was in there, not 100% sure).
> >
> > So its a format that uses the phrase StreamTitle. I don't know if this
> is a
> > old meta tag methodology, shoutcast specific, or icecast? It is not
> sending
> > http updates to the server, its in the stream itself.
>
> Let me backtrack here for a second.
>
> Liquidsoap streams have metadata attached to them, potentially at any
> position. When a metadata packet is received by output.icecast or
> output.shoutcast, it computes the new value for StreamTitle and sends that
> to icecast/shoutcast. See here: https://github.com/
> savonet/liquidsoap/blob/master/src/outputs/icecast2.ml#L402
>
> In turn, when icecast/shoutcast receives the metadata update call, it
> inserts the new metadata into the listeners stream, which is what you refer
> to as StreamTitle I think.
>
> So, in the most simple terms, as soon as a metadata of the form:
> [("title","Some text here")] is passed, with nothing else, them your
> listeners will see StreamTitle updated to "Some text here".
>
> Thus, your problem becomes simply: how to insert a metadata packet with
> only title like above.
>
> If, as you said in another message, your original files are .wav files
> then all you need to do is, instead of pushing a request of the form:
> /path/to/file.wav, push a request of the form:
> annotate:title="StreamTitle content":/path/to/file.wav
>
> And this will trickle down the stream path to update StreamTitle in your
> listeners stream.
>
> Romain
>
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