STRUCT DMXDEV_FILTER(9)

✨ struct dmxdev_filter(9) ✨

okay so bestie, welcome to the struct dmxdev_filter page from the Kernel API Manual — this is the digital TV dmxdev filter and she is, like, the main character of demux land 🎀 iykyk

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🌸 NAME 🌸

struct dmxdev_filter — digital TV dmxdev filter. literally what it says on the tin, no cap 💅

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🦋 SYNOPSIS 🦋

struct dmxdev_filter {
    union {
      struct dmx_section_filter *sec;
    } filter;
    union {
      struct list_head ts;
      struct dmx_section_feed *sec;
    } feed;
    union {
      struct dmx_sct_filter_params sec;
      struct dmx_pes_filter_params pes;
    } params;
    enum dmxdev_type type;
    enum dmxdev_state state;
    struct dmxdev *dev;
    struct dvb_ringbuffer buffer;
    struct dvb_vb2_ctx vb2_ctx;
    struct mutex mutex;
    struct timer_list timer;
    int todo;
    u8 secheader[3];
 };

look at her. all those unions. she's giving organized chaos and honestly? obsessed 🫶

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💖 Members 💖

• filter — a union describing a dmxdev filter. rn it's Currently used only for section filters. one job, and she's slaying it ✨
• filter.sec — a struct dmx_section_filter pointer. For section filter only, bestie 💅
• feed — a union describing a dmxdev feed. Depending on the filter type, it can be either feed.ts or feed.sec. choose your fighter 🌈
• feed.ts — a struct list_head list. For TS and PES feeds. very list. very head. we love her 🎀
• feed.sec — a struct dmx_section_feed pointer. For section feed only. section girlies rise 😭
• params — a union describing dmxdev filter parameters. Depending on the filter type, it can be either params.sec or params.pes — again, pick a lane babe 💜
• params.sec — a struct dmx_sct_filter_params embedded struct. For section filter only. embedded and thriving 🌸
• params.pes — a struct dmx_pes_filter_params embedded struct. For PES filter only. her PES era 🔥
• type — type of the dmxdev filter, as defined by enum dmxdev_type. know your type, be your type ⭐
• state — state of the dmxdev filter, as defined by enum dmxdev_state. she contains multitudes 💀
• dev — pointer to struct dmxdev. say hi to ur parent 🎀
• buffer — an embedded struct dvb_ringbuffer buffer. it's giving circular, it's giving storage 🦋
• vb2_ctx — control struct for VB2 handler. no notes, just vibes 👑
• mutex — protects the access to struct dmxdev_filter. do NOT skip the lock, bestie, that's how you get races and races are not cute 🙈
• timer — struct timer_list embedded timer, used to check for feed timeouts. Only for section filter. she's on the clock ⏰
• todo — index for the secheader. Only for section filter. yes she's literally named todo, and yes she's doing the work 💅
• secheader — buffer cache to parse the section header. Only for section filter. three whole bytes of u8 serving header-parsing realness ✨

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🧚 SEE ALSO 🧚

• Kernel file ./include/media/dmxdev.h enum dmxdev_type(9), enum dmxdev_state(9), struct dmxdev_feed(9), struct dmxdev(9), dvb_dmxdev_init(9), dvb_dmxdev_release(9)

go read the whole friend group, they're all iconic fr fr 🫶

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ngl bestie, every union in here is a "depends on the filter type" situation, so like… know your type before you touch the wrong member. lowkey important 💀

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and that's the page! shoutout to ./include/media from October 2026 for hosting this absolute queen of a struct — mwah, periodt 💖🌟