12 иÑ?лÑ? 2017 г. 7:42 PM полÑ?зоваÑ?елÑ? "Tanu Kaskinen" <tanuk at iki.fi> напиÑ?ал: On Tue, 2017-07-11 at 23:21 +0300, Denis Shulyaka wrote: > Hi list, > > I am making a small project, a home sound server. It will have a 5.1 analog > output and S/PDIF optical input, besides others. The server has to mix all > inputs and send them to the output. > My initial proof-of-concept with a loopback module failed when I realized > that S/PDIF interface can receive compressed formats that sounded like a > loud white noice to me instead of music. > > Can pulseaudio handle compressed audio streams apart from passthrough? You > cannot passthrough to an analog output without decode. > > I've found some different info here: > https://www.freedesktop.org/wiki/Software/PulseAudio/ Documentation/Developer/Passthrough/ > And here: > https://lists.freedesktop.org/archives/pulseaudio-discuss/ 2015-March/023322.html > > But could not understand its current status. No, pulseaudio can't decode compressed formats Well, that was more or less expected. Is such support planned? It means I need to write my own decoding application. But that leads me to another question: When I open the stream, how do I know its format? And how can I detect when it changes? I've came up with an idea to try different codecs and sample rates until I get something without decoder errors and not looking like a white noise, but well... you know... there must be a less ugly solution for that! (And I will have a really hard time detecting the format if my source _is_ a white noise for some reason). Best regards, Denis Shulyaka -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20170712/0cf1952e/attachment.html>
