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Capture: V4L2 backend for device source #1356

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Capture: V4L2 backend for device source #1356

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8e1852a
Add additional deps
ladvoc Aug 24, 2026
02c6ac1
Implement backend
ladvoc Aug 24, 2026
b557e5d
Changeset
ladvoc Aug 24, 2026
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5 changes: 5 additions & 0 deletions .changeset/capture-source-device-v4l2.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
livekit-capture: minor
---

Add Linux camera capture through V4L2.
3 changes: 3 additions & 0 deletions Cargo.lock
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9 changes: 9 additions & 0 deletions livekit-capture/Cargo.toml
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Expand Up @@ -85,6 +85,10 @@ source-device = [
"objc2-foundation/NSValue",
"objc2-foundation/NSString",
"objc2-foundation/objc2-core-foundation",
# Linux backend
"dep:image",
"dep:libc",
"dep:v4l",
]
source-pattern = ["dep:pollster", "dep:wgpu", "dep:yuv-sys"]

Expand Down Expand Up @@ -115,3 +119,8 @@ objc2-av-foundation = { version = "0.3.2", default-features = false, optional =
objc2-core-media = { version = "0.3.2", default-features = false, optional = true }
objc2-core-video = { version = "0.3.2", default-features = false, optional = true }
objc2-foundation = { version = "0.3.2", default-features = false, features = ["std"], optional = true }

[target.'cfg(target_os = "linux")'.dependencies]
image = { workspace = true, optional = true }
libc = { version = "0.2", optional = true }
v4l = { version = "0.14", default-features = false, features = ["v4l2"], optional = true }
14 changes: 9 additions & 5 deletions livekit-capture/src/sources/device/mod.rs
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Expand Up @@ -27,13 +27,17 @@

#[cfg(target_os = "macos")]
mod avfoundation;
#[cfg(target_os = "macos")]
#[cfg(any(target_os = "macos", target_os = "linux"))]
mod timestamp;
#[cfg(target_os = "linux")]
mod v4l2;

#[cfg(target_os = "macos")]
use avfoundation as backend;
#[cfg(not(target_os = "macos"))]
#[cfg(not(any(target_os = "macos", target_os = "linux")))]
use unsupported as backend;
#[cfg(target_os = "linux")]
use v4l2 as backend;

use std::fmt;

Expand Down Expand Up @@ -404,7 +408,7 @@ pub enum DeviceVideoSourceError {

/// Builds the packet-trailer metadata that device frames are pre-filled
/// with. A metadata callback set on the pump takes precedence.
#[cfg(target_os = "macos")]
#[cfg(any(target_os = "macos", target_os = "linux"))]
fn capture_frame_metadata(
capture_wall_time_us: u64,
) -> livekit::webrtc::video_frame::FrameMetadata {
Expand All @@ -417,7 +421,7 @@ fn capture_frame_metadata(

/// Validates the platform-neutral parts of a configuration; `supported`
/// reports whether the backend can deliver a frame format.
#[cfg_attr(not(target_os = "macos"), allow(dead_code))]
#[cfg_attr(not(any(target_os = "macos", target_os = "linux")), allow(dead_code))]
fn validate_config(
config: &DeviceVideoSourceConfig,
supported: fn(DeviceFrameFormat) -> bool,
Expand Down Expand Up @@ -479,7 +483,7 @@ fn validate_config(
}

/// Stub backend for platforms without device capture.
#[cfg(not(target_os = "macos"))]
#[cfg(not(any(target_os = "macos", target_os = "linux")))]
mod unsupported {
use livekit::webrtc::video_frame::BoxVideoFrame;

Expand Down
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