Hi
I have been doing some work with Shoutcast (internet radio) recently and 
thought it would be fun to make a plugin to stream directly to a server 
from within Csound. The plugin is in my git repo here:
https://git.1bpm.net/csound-shout/about/

I'm running a test at the moment which you can hear here:
http://1bpm.net:8000/salad.mp3

Not tested extensively so interested for feedback if anyone has use for 
it.
Internally it uses LAME to stream as MP3 - might be interesting to 
explore that mechanism between networked Csound instances, as I've had 
difficulty with socksend/sockrecv for audio - seemingly due to the 
bandwidth required.

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That's really interesting. Some years ago, I remember Tarmo set up a stream like that where we could go and interact with the server, submitting code to be played.

Using it as a means of sending audio to other instances is also an interesting idea.

Prof. Victor Lazzarini
Maynooth University
Ireland

> On 20 Mar 2025, at 00:49, Richard Knight  wrote:
>
> *Warning*
>
> This email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
>
> Hi
> I have been doing some work with Shoutcast (internet radio) recently and
> thought it would be fun to make a plugin to stream directly to a server
> from within Csound. The plugin is in my git repo here:
> https://git.1bpm.net/csound-shout/about/
>
> I'm running a test at the moment which you can hear here:
> http://1bpm.net:8000/salad.mp3
>
> Not tested extensively so interested for feedback if anyone has use for
> it.
> Internally it uses LAME to stream as MP3 - might be interesting to
> explore that mechanism between networked Csound instances, as I've had
> difficulty with socksend/sockrecv for audio - seemingly due to the
> bandwidth required.
>
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>       https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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Hi Richard!
Super interesting work!

But i don’t get how and where you run the Csound file for streaming?

Greetings,
Philipp
> Am 20.03.2025 um 01:49 schrieb Richard Knight :
> 
> Hi
> I have been doing some work with Shoutcast (internet radio) recently and thought it would be fun to make a plugin to stream directly to a server from within Csound. The plugin is in my git repo here:
> https://git.1bpm.net/csound-shout/about/
> 
> I'm running a test at the moment which you can hear here:
> http://1bpm.net:8000/salad.mp3
> 
> Not tested extensively so interested for feedback if anyone has use for it.
> Internally it uses LAME to stream as MP3 - might be interesting to explore that mechanism between networked Csound instances, as I've had difficulty with socksend/sockrecv for audio - seemingly due to the bandwidth required.
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>       https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here
> 

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Hi, the streaming happens within Csound itself.
So the connection to the server is setup with the opcodes shoutinit and 
shoutopen , and then you can pass audio to the shoutsend opcode.

There's a simple example in the repository here, which shows 
establishing the connection, and then sending a sound to the server:
https://git.1bpm.net/csound-shout/tree/examples/example.csd



On 2025-03-20 07:31, Philipp Neumann wrote:
> Hi Richard!
> Super interesting work!
> 
> But i don’t get how and where you run the Csound file for streaming?
> 
> Greetings,
> Philipp

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Hi, thank you, and really interesting to hear you've done things with Csound and streaming before, and glad it is useful!
The MP3 encoding particularly adds some CPU usage but I haven't found it limiting - in fact it seems lower usage than liquidsoap which I'm currently on the same machine to stream static files. But I would like to get to the bottom of it more and see how it can be optimised - what is your ksmps and does that make a difference on the load? Also maybe the quality setting might make a difference, and would you know roughly how much CPU % usage it adds to your csd, just so I get an idea of how bad the problem is? I'm seeing maybe 5% additional CPU on a slow (atom type cpu) box, but with high ksmps.

With the idea between networked Csound instances, I was thinking of a new plugin that would send/receive mp3 encoded streams. And you have a great point I didn't consider before about the latency, so maybe that's not such a great idea. These are reallyy useful suggestions, thank you - I will have a look at jacktrip and jamulus.

On 2025-03-20 08:28, Tarmo Johannes wrote:

Hi Richard!

 

Brilliant! This is very nice, thank you! I built in and tested on local openSuse Linux machine with icecast server -  everything went smoothly and worked as expected.

The only thing I noticed is that running this plugin, Csound eats a lot of CPU  - that is a bit of a problem.

 

It is so convenient to have such and opcode to stream straight from Csound to the broadcasting server! Before I used to use Csound->Jack->DarkIce for sending up the stream but this is so much more convenient.

 

You mentioned 'might be interesting to
explore that mechanism between networked Csound instances'

 

- how can the other side to receive the sound from the broadcasing server?

And of course then there is the latency problem, that is at least 5 but probably more seconds.

Just to mention - for low-latency audio transfer I find jacktrip a very good tool or Jamulus platform https://jamulus.io/ if you want to play together with several people (or Sonobus, but then the routing from/to Csound can be more difficult to achineve)

 

Thanks!

tarmo

Kontakt Philipp Neumann (<0000119f78f3a4f9-dmarc-request@listserv.heanet.ie>) kirjutas kuupäeval N, 20. märts 2025 kell 09:32:

Hi Richard!
Super interesting work!

But i don't get how and where you run the Csound file for streaming?

Greetings,
Philipp
> Am 20.03.2025 um 01:49 schrieb Richard Knight <richard@1BPM.NET>:
>
> Hi
> I have been doing some work with Shoutcast (internet radio) recently and thought it would be fun to make a plugin to stream directly to a server from within Csound. The plugin is in my git repo here:
> https://git.1bpm.net/csound-shout/about/
>
> I'm running a test at the moment which you can hear here:
> http://1bpm.net:8000/salad.mp3
>
> Not tested extensively so interested for feedback if anyone has use for it.
> Internally it uses LAME to stream as MP3 - might be interesting to explore that mechanism between networked Csound instances, as I've had difficulty with socksend/sockrecv for audio - seemingly due to the bandwidth required.
>
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>       https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here
>

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I did wonder about something interactive like that. That sounds 
interesting, would be intrigued to hear more about that setup Tarmo!

On 2025-03-20 06:45, Victor Lazzarini wrote:
> That's really interesting. Some years ago, I remember Tarmo set up a
> stream like that where we could go and interact with the server,
> submitting code to be played.
> 
> Using it as a means of sending audio to other instances is also an
> interesting idea.
> 
> Prof. Victor Lazzarini
> Maynooth University
> Ireland

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That seems good and not heard of it before, I will have a look, thanks.

On 2025-03-20 16:11, Eduardo Moguillansky wrote:

If the goal is to broadcast audio over the network I would look into libaao (audio over osc): https://git.iem.at/aoo/aoo,

 

it is the underlying protocol used by sonobus and in my own experience it offers low latency while being cross-platform than other tools like jack trip.

On Thu, Mar 20, 2025 at 3:13 PM Richard Knight <richard@1bpm.net> wrote:

I did wonder about something interactive like that. That sounds
interesting, would be intrigued to hear more about that setup Tarmo!

On 2025-03-20 06:45, Victor Lazzarini wrote:
> That's really interesting. Some years ago, I remember Tarmo set up a
> stream like that where we could go and interact with the server,
> submitting code to be played.
>
> Using it as a means of sending audio to other instances is also an
> interesting idea.
>
> Prof. Victor Lazzarini
> Maynooth University
> Ireland

Csound mailing list
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Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here