12 иÑ?лÑ? 2017 г. 23:58 полÑ?зоваÑ?елÑ? "Tanu Kaskinen" <tanuk at iki.fi> напиÑ?ал: I don't know how the endpoints are supposed to agree on the format, and what kind of interface alsa provides for that (if any). The alsa-devel list might be more appropriate for questions about spdif details. Ok, I will ask there. I've found datasheet for my hardware (CM106) and I can see it that the information about whether the stream is compressed and its sample rate is available to the driver. I just need to figure out if ALSA gets it and propagates to PA. I don't think it's necessary to figure out whether the data looks like white noise. I believe compressed formats have some identification bits, and if the data matches no compressed format, then I think it's fine to assume that it's stereo 16-bit PCM data. Figuring out the sample rate may require waiting for a bit to see at which rate the sound card is producing audio. Maybe this is why at least some spdif receivers lose a bit of audio from the beginning when starting to play over spdif. After some more googling I've found that there is IEC61937 standard that defines which audio codec is used. Thank you for your support, I'll now try to understand how ALSA works first. Best regards, Denis Shulyaka -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20170713/96bdf296/attachment.html>
