Date: Fri, 04 Dec 2020 15:17:34 +0000 From: bugzilla-noreply@freebsd.org To: multimedia@FreeBSD.org Subject: [Bug 251125] audio/jack: update to jack2 or add new port audio/jack2 Message-ID: <bug-251125-12827-L7UT3QKYOS@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-251125-12827@https.bugs.freebsd.org/bugzilla/> References: <bug-251125-12827@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D251125 --- Comment #48 from Florian Walpen <dev@submerge.ch> --- (In reply to Hans Petter Selasky from comment #46) > There is: >=20 > SNDCTL_DSP_SETBLKSIZE I've seen that in the FreeBSD sources, but it sets fragment count to 2 and = ends up in the same chn_resizebuf(...) as above, rounding fragment size to 2^N a= nd then aligns it to frame size. I'm not using Virtual OSS unfortunately, but Goran does, I think - it may be worth a try as Virtual OSS seems to be more flexible in this regard. But th= is IOCTL is specific to FreeBSD and Virtual OSS I think. > A fragment is usually the smallest entity the audio driver can process. W= ith > USB audio this entity is fixed and can be slightly controlled by > hw.usb.uaudio.buffer_ms to 2,3,4,5,6,7 or 8 ms. In that case it would be best to leave the predefined fragment size as is, right? But we'd have to make sure that jack doesn't block for too long, the= re must be enough fragments to hold the jack period (twice). I have to check t= his. > Other drivers select the buffer size given by the user. This also depends= on > the use of vchans. Bitperfect mode is different, as you know. I suppose we should set the fragment size there. A strategy could be to div= ide the total buffer size into 8 fragments for longer period cycles, and 4 fragments for short periods, if there is no matching fragment size. --=20 You are receiving this mail because: You are the assignee for the bug.=
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