video_devic..._alloc_start(9)

💅 video_devic..._alloc_start(9) — like, the Kernel API Manual page, bestie

ok so real talk, we're in the Kernel API Manual today and the star of the show is video_device_pipeline_alloc_start. yes the name is a whole mouthful, i know, but she's iconic and you're gonna get it. 🎀

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✨ NAME ✨

video_device_pipeline_alloc_start — marks a pipeline as streaming, periodt 💫

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🌸 SYNOPSIS 🌸

int video_device_pipeline_alloc_start (struct video_device *vdev );

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🦋 ARGUMENTS 🦋

• vdev — the starting video device. like, this is the one you're kicking things off with, no cap 🫶

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💖 DESCRIPTION 💖

okay so here's the tea. video_device_pipeline_alloc_start is lowkey similar to video_device_pipeline_start, BUT — and this is the main character plot twist — instead of working on a given pipeline, she'll just use an existing pipeline if the video device is already part of one. and if it's not? she allocates a new one, slay ✨

basically she's flexible like that. use what's there, or make something new. either way, she's handling it 💅

🚨 bestie please remember: calls to video_device_pipeline_alloc_start must be matched with video_device_pipeline_stop. they're a pair. a duo. you cannot leave her hanging, fr fr. 😭

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🔥 SEE ALSO 🔥

Kernel file ./include/media/v4l2-dev.h

• enum vfl_devnode_type(9)
• enum vfl_devnode_direction(9)
• enum v4l2_video_device_flags(9)
• struct v4l2_prio_state(9)
• v4l2_prio_init(9)
• v4l2_prio_change(9)
• v4l2_prio_open(9)
• v4l2_prio_close(9)
• v4l2_prio_max(9)
• v4l2_prio_check(9)
• struct v4l2_file_operations(9)
• struct video_device(9)
• media_entity_to_video_device(9)
• to_video_device(9)
• __video_register_device(9)
• video_register_device(9)
• video_register_device_no_warn(9)
• video_unregister_device(9)
• video_device_alloc(9)
• video_device_release(9)
• video_device_release_empty(9)
• v4l2_disable_ioctl(9)
• video_get_drvdata(9)
• video_set_drvdata(9)
• video_devdata(9)
• video_drvdata(9)
• video_device_node_name(9)
• video_is_registered(9)
• v4l2_debugfs_root(9)
• video_device_pipeline_start(9)
• __video_device_pipeline_start(9)
• video_device_pipeline_stop(9)
• __video_device_pipeline_stop(9)
• video_device_pipeline(9)

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and that's the whole page, bestie, you ate that 🍓

sign-off szn: this one lives in ./include/media and it's dated October 2026 — so mark your calendar, she's from the future and she's still serving 💜🧚‍♀️