snd_interval_ratden(9)

🎀 snd_interval_ratden(9) — the Kernel API Manual, bestie edition

okay so this is a page from the Kernel API Manual, and today's main character is snd_interval_ratden 💅 it's a kernel function, it lives in ./sound/core, and it's here to refine the interval value. yes queen, that's the whole name-line vibe. let's get into it ✨

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✨ NAME ✨

snd_interval_ratden — refine the interval value 🦋

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🌸 SYNOPSIS 🌸

int snd_interval_ratden (struct snd_interval *i , unsigned int
rats_count , const struct snd_ratden *rats , unsigned int *nump ,
unsigned int *denp );

like, look at her. five arguments, one int coming back at you, no notes. 🫶

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💖 ARGUMENTS 💖

• i — the interval you wanna refine, bestie. that's the whole point of showing up tbh.
• rats_count — the number of struct ratden in the array. yes, the count. iconic of her to ask.
• rats — the struct ratden array itself 🌈 this is where the rationals live.
• nump — a pointer, and its job is to store the resultant numerator. she's holding it for you.
• denp — same energy, but for the resultant denominator. put it there and slay ✨

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🔥 RETURN 🔥

so what does she give back? 🥺

• Positive — the value is changed, we ate 💅
• Zero — nope, no change, nothing happened, not a single thing
• a negative error code — it's giving error, handle it fr fr 😭

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👑 SEE ALSO 👑

this is the part where she tags everyone in the group chat. no cap, the full list, nobody gets left out 🫶

the kernel file this lives in is ./sound/core/pcm_lib.c — go say hi.

the interval girlies (the refine-the-numbers crew):

• snd_interval_refine(9)
• snd_interval_div(9)
• snd_interval_muldivk(9)
• snd_interval_mulkdiv(9)
• snd_interval_ratnum(9)
• snd_interval_list(9)
• snd_interval_ranges(9)

the PCM setup + constraint besties (so many constraints, we love a boundary):

• snd_pcm_set_ops(9)
• snd_pcm_set_sync_per_card(9)
• snd_pcm_hw_rule_add(9)
• snd_pcm_hw_constraint_mask(9)
• snd_pcm_hw_constraint_mask64(9)
• snd_pcm_hw_constraint_integer(9)
• snd_pcm_hw_constraint_minmax(9)
• snd_pcm_hw_constraint_list(9)
• snd_pcm_hw_constraint_ranges(9)
• snd_pcm_hw_constraint_ratnums(9)
• snd_pcm_hw_constraint_ratdens(9)
• snd_pcm_hw_constraint_msbits(9)
• snd_pcm_hw_constraint_step(9)
• snd_pcm_hw_constraint_pow2(9)
• snd_pcm_hw_rule_noresample(9)

the param + period pipeline (the ones who actually report back):

• snd_pcm_hw_param_value(9)
• snd_pcm_hw_param_first(9)
• snd_pcm_hw_param_last(9)
• snd_pcm_hw_params_bits(9)
• snd_pcm_lib_ioctl(9)
• snd_pcm_period_elapsed_under_stream_lock(9)
• snd_pcm_period_elapsed(9)
• snd_pcm_add_chmap_ctls(9)

ngl the SEE ALSO section is lowkey the biggest flex on this whole page. twenty-six-plus cross-references and she's still got main character energy 💀👑

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and that's the page, bestie!! 🧚💜 this little gem ships out of ./sound/core and it's dated October 2026, page snd_interval_ratden(9) — bookmark it, cite it, cite it again, periodt 🍓✨