pcm_pointer(9)

✨ NAME ✨

okay so bestie, welcome to pcm_pointer(9) — straight outta the Kernel API Manual 💅. This one implements the pointer callback function for the PCM middle layer. Periodt.

🌸 SYNOPSIS 🌸

snd_pcm_uframes_t pcm_pointer (struct snd_pcm_substream *substream );

🎀 ARGUMENTS 🎀

• substream — the substream pointer. That's the whole argument, and she ate. ✨

🦋 DESCRIPTION 🦋

This callback gets called when the PCM middle layer is inquiring about the current hardware position on the buffer 👀.

The position must be returned in frames, ranging from 0 to buffer_size-1. No cap, those are the bounds — don't be out here returning anything else.

💖 SEE ALSO 💖

• Kernel file ./drivers/most/most_snd.c
• struct channel(9)
• get_channel(9)
• copy_data(9)
• playback_thread(9)
• pcm_open(9)
• pcm_close(9)
• pcm_prepare(9)
• pcm_trigger(9)
• audio_probe_channel(9)
• audio_disconnect_channel(9)
• audio_rx_completion(9)
• audio_tx_completion(9)

and that's the vibe check, bestie 🫶 — this page comes from ./drivers/most, is dated October 2026, and goes by pcm_pointer(9). mwah 💋