On 3/5/18 23:24, Borja Marcos wrote: > That would be really awesome, defining some standard “audio bus” for > radio applications.
Well, there's really not much to define since the work has already been done for us by the IETF (Internet Engineering Task Force). Multicasting is heavily used on LANs, mainly for resource discovery (especially by Apple's Bonjour, which is also an IETF standard). But IMHO IP multicasting hasn't lived up to its full potential, mainly because few ISPs support it natively so you have to set up ad-hoc tunnels. It's the basis of AT&T's U-verse service, and I'm looking hard at using it for "smart" wide area roundtables and repeater links in ham radio, but that's getting off topic. RTP can be used with any audio format (or video, for that matter). I use Opus (a fairly new and very nice lossy audio compression format) for stuff I'm going to listen to by ear, but I still use PCM for anything I'm going to feed to a demodulator program. They can easily coexist in the same network. E.g., I wrote a simple server task that 'bridges' multicast PCM to Opus to make it easy to listen remotely to the output of a receiver module that produces only PCM. > Making it multi platform and multi tooklit can be > tricky, though. WSJT-X is based on Qt audio. But, what about other apps? The whole idea is to completely AVOID the audio subsystem on the host computer running WSJT-X (or any other demod program, for that matter). So there's no need for audio patching utilities like Jack or Soundflower. A program like WSJT-X simply reads and processes (and/or writes) multicast streams that just happen to contain digital audio. But they're handled as ordinary data packets by the operating system. But if I want to monitor the audio input to (or output from) a program like WSJT-X, I can simply fire up a completely independent "multicast monitor" program that joins the appropriate multicast group and streams the audio to the local sound system. Otherwise I could listen to music, watch a video, whatever, while WSJT-X quietly runs in its own window. Phil ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
