snd_pcm_hw_...aint_ratdens(9)

📦 version 7.3.1, in nixpkgs unstable

✨ snd_pcm_hw_constraint_ratdens — the ratdens-constraint bestie 💖

okay so real talk, this is from the Kernel API Manual — like, the actual kernel API docs, not some random blog post, and we are gonna get through it together. grab a boba. 🧋

🌸 NAME 🌸

snd_pcm_hw_constraint_ratdens — the function that slaps a ratdens constraint onto a parameter. that's it, that's the vibe. periodt. 💅

🎀 SYNOPSIS 🎀

int snd_pcm_hw_constraint_ratdens (struct snd_pcm_runtime *runtime ,
unsigned int cond , snd_pcm_hw_param_t var , const struct
snd_pcm_hw_constraint_ratdens *r );

literally that's the whole signature, copy it exactly bestie, do not freestyle the punctuation, i'm begging 🫶

🦋 ARGUMENTS 🦋

  • runtime — the PCM runtime instance. yes queen, the whole runtime. the main character. 👑
  • cond — the condition bits. little flags doing their little flag thing. ✨
  • var — the hw_params variable that the ratdens constraint gets applied to. that's the target, the chosen one. 🎯
  • r — struct snd_ratdens constriants. (that spelling? not mine, it's in the source. we respect the source. 🙈) icl it's giving struct-of-rational-density energy and i'm obsessed.

⭐ RETURN ⭐

returns zero if everything slayed, or a negative error code if it failed. so like, if it's not 0, something went off and you should probably care about it. no cap. 😭

🌈 SEE ALSO 🌈

okay this list is LONG but every single one of these stays, i am NOT skipping a single reference, we are thorough in this house 🏠💅

kernel file ./sound/core/pcm_lib.c — go read it, iykyk:

like, the whole friend group showed up. 💜

pro tip from your girl: don't just skim the SEE ALSO, those siblings are literally the same family of constraint helpers and they WILL come up. 🧚

aaaand that's the page!! 🎀 this one lives in ./sound/core and it's dated October 2026, so yeah, straight from the source, mwah 💋 slay, go write some audio drivers bestie 🔥👑

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