STRUCT SND_COMPR_CAPS(9)

💖 STRUCT SND_COMPR_CAPS(9) 💖

okay bestie so you're looking at the Kernel API Manual and today's main character is struct snd_compr_caps — literally the caps descriptor, no cap 🧢✨

---

🌸 NAME 🌸

struct snd_compr_caps — the caps descriptor. that's it, that's the vibe 💅

---

✨ SYNOPSIS ✨

struct snd_compr_caps {
    __u32 num_codecs;
    __u32 direction;
    __u32 min_fragment_size;
    __u32 max_fragment_size;
    __u32 min_fragments;
    __u32 max_fragments;
    __u32 codecs[MAX_NUM_CODECS];
    __u32 reserved[11];
 };

copy it exactly pls, we do NOT freestyle struct definitions in this house 🙈

---

🎀 MEMBERS 🎀

• num_codecs — how many codecs are supported, like the actual headcount 👑
• direction — which direction is supported. it's of type snd_compr_direction, iykyk 🦋
• min_fragment_size — the minimum fragment supported by the DSP, the little guy 🍓
• max_fragment_size — the maximum fragment supported by the DSP, the big guy 🔥
• min_fragments — min fragments supported by the DSP, lowkey the floor ⭐
• max_fragments — max fragments supported by the DSP, highkey the ceiling 🌈
• codecs — pointer to an array of codecs. she's pointing at the lineup 💜
• reserved — reserved field. leave her alone, she's reserved for a reason 💀

---

🫶 SEE ALSO 🫶

kernel file ./include/uapi/sound/compress_offload.h, plus the whole friend group — go say hi to all of them:

• struct snd_compressed_buffer(9)
• struct snd_compr_params(9)
• struct snd_compr_tstamp(9)
• struct snd_compr_tstamp64(9)
• struct snd_compr_avail(9)
• struct snd_compr_avail64(9)
• struct snd_compr_codec_caps(9)
• enum sndrv_compress_encoder(9)
• struct snd_compr_metadata(9)
• struct snd_compr_task(9)
• enum snd_compr_state(9)
• struct snd_compr_task_status(9)

---

ngl this page lives at ./include/uapi/sound and it's dated October 2026 — future icon behaviour fr fr 👑✨

and that's the whole page bestie, mwah 💋 go read the source, periodt 💅🎀