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dino: increase buffering 20ms -> 100ms (closer to 82ms, actually)

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Colin 2024-04-25 11:28:22 +00:00
parent 7843f9650a
commit 4453bde815
1 changed files with 16 additions and 4 deletions
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hosts/common/programs/dino.nix
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@ -97,17 +97,29 @@ in
# audio buffering; see: <https://gitlab.freedesktop.org/pipewire/pipewire/-/wikis/FAQ#pipewire-buffering-explained>
# dino defaults to 10ms mic buffer, which causes underruns, which Dino handles *very* poorly
# as in, the other end of the call will just not receive sound from us for a couple seconds.
# pipewire uses power-of-two buffering for the mic itself. that would put us at 21.33 ms, but this env var supports only whole numbers (21ms ends up not power-of-two).
# also, Dino's likely still doing things in 10ms batches internally anyway.
# pipewire uses power-of-two buffering for the mic itself (by default), but this env var supports only whole numbers, which isn't quite reconcilable:
# - 1024/48000 = 21.33ms
# - 2048/48000 = 42.67ms
# - 4096/48000 = 85.33ms
# also, Dino's likely still doing things in 10ms batches internally.
#
# note that this number supposedly is just the buffer size which Dino asks Pulse (pipewire) to share with it.
# in theory, it's equivalent to adjusting pipewire's quanta setting, and so isn't additive to the existing pipewire buffers.
# (and would also be overriden by pipewire's quanta.min setting).
# but in practice, setting this seems to have some more effect beyond just the buffer sizes visible in `pw-top`.
#
# further: decrease the "niceness" of dino, so that it can take precedence over anything else.
# ideally this would target just the audio processing, rather than the whole program.
# pipewire is the equivalent of `nice -n -21`, so probably don't want to go any more extreme than that.
# nice -n -15 chosen arbitrarily; not optimized
# nice -n -15 chosen arbitrarily; not optimized (and seems to have very little impact in practice anyway).
# buffer size:
# - 1024 (PULSE_LATENCY_MSEC=20): `pw-top` shows several underruns per second.
# - 2048 (PULSE_LATENCY_MSEC=40): `pw-top` shows very few underruns. maybe 1-2 per minute. but i still get gaps in which the mic "disappears"
# - 4096 (PULSE_LATENCY_MSEC=100): `pw-top` shows 0 underruns.
#
# note that debug logging during calls produces so much journal spam that it pegs the CPU and causes dropped audio
# env G_MESSAGES_DEBUG = "all";
command = "env PULSE_LATENCY_MSEC=20 nice -n -15 dino";
command = "env PULSE_LATENCY_MSEC=100 nice -n -15 dino";
};
};
}