fix: simplify ALSA buffer size and period configuration logic#1009
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roderickvd merged 2 commits intomasterfrom Sep 11, 2025
Merged
fix: simplify ALSA buffer size and period configuration logic#1009roderickvd merged 2 commits intomasterfrom
roderickvd merged 2 commits intomasterfrom
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This mostly reverts #990 for device compatibility, by letting ALSA calculate the period size from the device default period count. Forcing the period count to 2 caused underruns on some systems.
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Use device default number of periods for better device compatibility.
Problem
#990 broke playback on one of my USB devices on a Raspberry Pi 4 with the following error immediately on opening the stream:
Changing to use
set_period_timeinstead ofset_period_sizefixes stream opening, but then runs into the same error minutes after playback.Investigations have shown that the root cause is to always set two periods. Reverting to the device defaults (four periods) fixes the issue.
Way Forward
I have reverted most of #990 (still: @attackgoat thanks a lot for your hard work on that!) to go back to the device defaults. Instead, with PR #1010 I am proposing an ergonomic API to set platform-specific options like the number of periods on ALSA.
I also submitted PR diwic/alsa-rs#137 to expose more Alsa getters and setters relevant to periods and buffers.