snd_pcm_hw_constraint_pow2(9)

📦 version 7.3.1, in nixpkgs unstable

💖 snd_pcm_hw_constraint_pow2 — add a hw constraint power-of-2 rule ✨

okay so bestie, welcome to the Kernel API Manual 🎀 — yes we're in kernel land today, and this little function is literally the vibe check for power-of-2 constraints on your PCM hardware params. Let's go 💅

🌸 SYNOPSIS 🌸

int snd_pcm_hw_constraint_pow2 (struct snd_pcm_runtime *runtime ,
unsigned int cond , snd_pcm_hw_param_t var );

like, that's the whole signature, no cap 🫶

✨ ARGUMENTS ✨

  • runtime — the PCM runtime instance 🌀 like, the whole current state of your PCM stream, bestie
  • cond — condition bits 🎚️ the little flags that tell it when this rule should kick in
  • var — the hw_params variable you're slapping the power-of-2 constraint onto 🔥 so like, whichever parameter needs to be 1, 2, 4, 8, 16... you get it 💅

🦋 RETURN 🦋

Zero if successful — iconic, we love a clean 0 💖 — or a negative error code on failure 😭 yeah, if it flops you get a negative number back, that's the whole deal.

👑 SEE ALSO 👑

okay this list is long and honestly it ate, so here's the whole thing, every single one, no skipping 🙈

Kernel file ./sound/core/pcm_lib.c 🗂️ — that's where the magic lives, plus all these besties:

thirty of them. thirty!! and I listed every single one because that's the kind of friend I am 💅✨

and that's the page, bestie!! 🌈 mwah 💋 this one came straight out of ./sound/core and it's dated October 2026 — so yeah, future vibes only ⭐ go forth and constrain your power-of-2s, you absolute icon 👑💜

📦 where this page comes from