dvb_dmx_swfilter_204(9)

💅 dvb_dmx_swfilter_204(9) — the Linux kernel API manual, bestie edition ✨

okay so this is a page from the Kernel API Manual, and it's about dvb_dmx_swfilter_204 — the lil routine that runs the dvb software filter over a buffer stuffed with a whole bunch of MPEG-TS packets that are 204 bytes each 🎀

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✨ NAME ✨

dvb_dmx_swfilter_204 — use the dvb software filter for a buffer with multiple MPEG-TS packets with 204 bytes each. yes bb, multiple, this one's doing the group-chat version of filtering 💅

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🌸 SYNOPSIS 🌸

void dvb_dmx_swfilter_204 (struct dvb_demux *demux , const u8 *buf ,
       size_t count );

like, that's the whole signature, no cap 🫶

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🦋 ARGUMENTS 🦋

• demux — pointer to struct dvb_demux. this is the main character of the operation, the demuxer itself 💖
• buf — buffer with data to be filtered. your raw lil pile of bytes ✨
• count — number of MPEG-TS packets with size of 204. so it's counting packets, not bytes, keep that straight bestie 😭

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🧚 DESCRIPTION 🧚

okay so here's the vibe check: if a DVB packet doesn't start with 0x47, it will seek for the first byte that starts with 0x47. the way it just hunts for that sync byte, lowkey iconic 🔥

Use this routine if the DVB demux fill buffers that may not start with a packet start mark (0x47). yes — this is exactly the function for when you can't trust that first byte to be the packet start mark, and you need it to go find one 🎀

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💀 NOTE 💀

The buf size should have size equal to count * 204. fr fr, do the math before you call it, or it's giving undefined nonsense 🙈

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🌈 SEE ALSO 🌈

Kernel file ./include/media/dvb_demux.h and its whole friend group:

• enum dvb_dmx_filter_type(9)
• enum dvb_dmx_state(9)
• struct dvb_demux_filter(9)
• struct dvb_demux_feed(9)
• struct dvb_demux(9)
• dvb_dmx_init(9)
• dvb_dmx_release(9)
• dvb_dmx_swfilter_packets(9)
• dvb_dmx_swfilter(9)
• dvb_dmx_swfilter_raw(9)

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and that's the page, bestie 💜 it lives over in ./include/media, dated October 2026, and it's the Kernel API Manual's very own dvb_dmx_swfilter_204(9) — mwah, slay, go filter those 204-byte packets 👑💅