Date: Mon, 26 Nov 2018 13:43:30 -0600 From: Karl Denninger <karl@denninger.net> To: freebsd-arm@freebsd.org Subject: Re: Raspberry PI 2B/3 and USB audio Message-ID: <1418f261-9f56-7931-d23f-85059fdda077@denninger.net> In-Reply-To: <87lg5fhcgz.wl-herbert@gojira.at> References: <87ftw96uq0.wl-herbert@gojira.at> <6beca923-ba25-3814-6bb2-f4cc2d7360d3@selasky.org> <875zx2hyey.wl-herbert@gojira.at> <87lg5fhcgz.wl-herbert@gojira.at>
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This is a cryptographically signed message in MIME format. --------------ms060701060201080202030609 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable This one works fine on my Pi2.... (and it was dirt cheap too) uaudio0 on uhub1 uaudio0: <C-Media Electronics Inc. USB Audio Device, class 0/0, rev 1.10/1.00, addr 6> on usbus0 uaudio0: Play: 48000 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer. uaudio0: Play: 44100 Hz, 2 ch, 16-bit S-LE PCM format, 2x8ms buffer. uaudio0: Record: 48000 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer. uaudio0: Record: 44100 Hz, 1 ch, 16-bit S-LE PCM format, 2x8ms buffer. uaudio0: No MIDI sequencer. pcm1: <USB audio> on uaudio0 uaudio0: HID volume keys found. It was a no-name, and is a "full speed".... ugen0.6: <C-Media Electronics Inc. USB Audio Device> at usbus0, cfg=3D0 md=3DHOST spd=3DFULL (12Mbps) pwr=3DON (100mA) FreeBSD 11.0-STABLE #1 r313159M: Wed Feb 15 13:36:01 CST 2017=C2=A0=C2=A0= =C2=A0=C2=A0 freebsd@NewFS.denninger.net:/pics/Crochet-work/obj/arm.armv6/pics/CrossBu= ild/src/sys/RPI2 Older kernel and OS, but working fine.=C2=A0 I use it to play synthesized= voice and MP3s. On 11/26/2018 13:21, Herbert J. Skuhra wrote: > On Mon, 12 Nov 2018 20:46:13 +0100, "Herbert J. Skuhra" wrote: >> On Sun, 11 Nov 2018 13:52:14 +0100, Hans Petter Selasky wrote: >>> On 11/10/18 12:24 PM, Herbert J. Skuhra wrote: >>>> Hi, >>>> >>>> if you use an USB sound card on your Raspberry PI 2B/3, can you plea= se >>>> answer the following questions: >>>> >>>> - which USB sound card? >>>> - do you have bad audio on current or stable/12 after r339388? >>>> >>>> My "Creative Technology Ltd Sound Blaster Play 2" device sounds very= >>>> bad. Meanwhile more changes were commited but they don't fix audio >>>> completly. >>>> >>> Hi, >>> >>> Some background: >>> >>> The USB controller in Raspberry PI is running HIGH-speed USB. Many US= B >>> audio device are FULL-speed USB. In order for a FULL-speed USB device= >>> to work in a HIGH-speed USB environment all data transfers need to go= >>> through a so-called transaction translator. This transaction >>> translator operate on chunks of data, 171 bytes maximum. That means i= f >>> a USB audio stream generates 1000 packets per second, then suddenly a= >>> bunch of smaller packets will be needed. This puts some stress on the= >>> DWC OTG driver and there might be some room for improvement in this >>> area too, but the basic sympthom is that the DWC OTG driver in FreeBS= D >>> is not always able to keep up with the timing required for these >>> so-called split transactions. One idea is to move all DWC OTG IRQ >>> handling away from CPU-0. I'm not sure if cpuset supports this yet on= >>> armv7 // arm64. Might have to be done in the driver. >>> >>> Further some audio device use non-adaptive clocks, which means the >>> recording channel must be active along with the playback channel else= >>> jitter will occur. >>> >>> The recommendation for RPI is a HIGH-speed USB audio device (should b= e >>> clearly marked in the specification). Using a HIGH-speed USB audio >>> device will reduce the number of interrupts significantly. >> Well, the sound card worked perfectly fine so far... both on FreeBSD >> and Arch Linux ARM... no luck with NetBSD. Never mind! I am obviously >> the only user affected by this "fix" (r339388). > Unfortunally I've purchased another full-speed usb audio device: > > uaudio0 on uhub1 > uaudio0: <Creative Technology Ltd Sound Blaster Play 3, class 0/0, rev = 2.00/1.06, addr 4> on usbus0 > uaudio0: Play: 96000 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer. > uaudio0: Play: 88200 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer. > uaudio0: Play: 48000 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer. > uaudio0: Play: 44100 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer. > uaudio0: Record: 48000 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer. > uaudio0: Record: 44100 Hz, 2 ch, 24-bit S-LE PCM format, 2x8ms buffer. > uaudio0: No MIDI sequencer. > pcm0: <USB audio> on uaudio0 > uaudio0: HID volume keys found. > > While it works fine under Linux (pulse), MacOS and Windows, it > produces only bad noise under FreeBSD (Raspberry PI3B)! :-( > > How can I get it working? Can anyone recommend an USB audio device for > FreeBSD? Should DACs from Pro-Ject work? > > Thanks. > > -- > Herbert > _______________________________________________ > freebsd-arm@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-arm > To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms060701060201080202030609 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw FwYDVQQKDBBDdWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExITAf 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