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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 18 Jun 2020
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      So it turns out they report audio at 1ch 96kHz, but it's actually 2ch 48kHz. Currently testing a quirk patch for Linux, assuming it works as intended expect it in a stable series near you once it percolates through the pipeline.

      4 replies 0 retweets 16 likes
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    2. Hector Martin‏ @marcan42 18 Jun 2020
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      FWIW, interpreting 48k stereo as 96k mono (and downsampling to 48k, because you are, right?) is mathematically equivalent to a clean mono mixdown except one channel is delayed by 0.5 samples, which is negligible. So it's safe to use the card on Win/Mac and pretend it's mono.

      1 reply 1 retweet 17 likes
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    3. Hector Martin‏ @marcan42 18 Jun 2020
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      Basically for mono (center panned) content you'll get a slight high frequency rolloff (4dB or so at Nyquist = 24kHz), and hard panned content will sound fine with no distortion.

      1 reply 0 retweets 10 likes
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    4. Hector Martin‏ @marcan42 18 Jun 2020
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      OMG. I think this is why they claim 96kHz mono. Assuming this isn't a bug in my USB config... these things have a hardware bug which briefly swaps the channels intermittently. Every second or so. So they probably set it to 96k mono as a hack so you won't notice!pic.twitter.com/XGnJ9OQogJ

      3 replies 3 retweets 37 likes
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    5. Hector Martin‏ @marcan42 18 Jun 2020
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      I have a suspicion as to what causes this and Linux might already have a quirk to deal with it. I think this happens when the USB transfer size is not a multiple of the number of channels.

      2 replies 1 retweet 18 likes
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    6. Hector Martin‏ @marcan42 18 Jun 2020
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      Yup, QUIRK_AUDIO_ALIGN_TRANSFER fixed it... and now the channels are just backwards. Lovely. At least it seems they're *consistently* backwards. Hopefully there's a way of quirking this in ALSA...

      2 replies 0 retweets 20 likes
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    7. Farce Majeure 🌹‏ @vathpela 18 Jun 2020
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      Replying to @marcan42

      That's at least a very simple patch.

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 18 Jun 2020
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      Replying to @vathpela

      Actually, I don't think channel swaps are a thing in the ALSA USB driver. Seems that's handled in userspace... which means only some userspace will handle it properly. Probably needs a separate PulseAudio config etc...

      1 reply 0 retweets 0 likes
    9. Farce Majeure 🌹‏ @vathpela 18 Jun 2020
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      Replying to @marcan42

      Okay, but it's an easy pa module *or* an easy kernel patch to add that entirely.

      1 reply 0 retweets 0 likes
    10. Farce Majeure 🌹‏ @vathpela 18 Jun 2020
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      Replying to @vathpela @marcan42

      Forgive me, I've been guess-and-test debugging a terrible USB sound chip.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 18 Jun 2020
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      Replying to @vathpela

      I think the kernel guys don't want audio format conversions in kernel space, so it's gotta be userspace.

      9:53 PM - 18 Jun 2020
      1 reply 0 retweets 0 likes
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        1. Farce Majeure 🌹‏ @vathpela 18 Jun 2020
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          Replying to @marcan42

          Fair enough, I guess, though it's pretty arbitrarily given the existing quirk tables.

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 18 Jun 2020
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          Replying to @vathpela

          I think the point is the kernel shouldn't be doing format conversions, which have a high CPU cost. All the existing quirks are about metadata/control, not formats.

          1 reply 0 retweets 0 likes
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