amdtp_stream_pcm_trigger(9)

👑 amdtp_stream_pcm_trigger(9) 👑

okay so bestie, this little icon is from the Kernel API Manual — yes, that's the manual name, we're fancy now 💅. It's giving low-level FireWire audio realness, and we're gonna read it together. No cap.

✨ NAME ✨

amdtp_stream_pcm_trigger — start/stop playback from a PCM device 🎧

🌸 SYNOPSIS 🌸

void amdtp_stream_pcm_trigger (struct amdtp_stream *s , struct snd_pcm_substream *pcm );

🎀 ARGUMENTS 🎀

• s — the AMDTP stream. literally the stream we're hyping up 🦋
• pcm — the PCM device to be started, or NULL to stop the current device. yep, passing NULL is the stop button 🙈

💖 DESCRIPTION 💖

So call this function on a running isochronous stream when you wanna enable the actual transmission of PCM data ✨. The stream is already running; this is about enabling the actual PCM data transmission. That's the whole vibe, bestie.

And this function should be called from the PCM device's .trigger callback — exact spot, no improvising 🫶.

🦋 SEE ALSO 🦋

All the linked lore, fr fr:

• Kernel file ./sound/firewire/amdtp-stream.h
• enum cip_flags(9)
• enum cip_sfc(9)
• amdtp_stream_running(9)
• amdtp_streaming_error(9)
• amdtp_stream_pcm_running(9)
• amdtp_stream_next_packet_desc(9)
• amdtp_domain_wait_ready(9)

mwah 💋 — source/version: ./sound/firewire; dated October 2026. that's the footer, bestie, and we ate 🍓✨