Dual-Channel Video Capture (UVC)

A USB Video Class (UVC) device that exposes two independent video streaming functions on a single device.

What it does

Presents two UVC camera functions, both 128x96 at 10 fps.
Stream 0 sends YUY2 (uncompressed) color bars; stream 1 sends MJPEG color-bar frames.
Uses bulk streaming endpoints (CFG_TUD_VIDEO_STREAMING_BULK).
Adopts the frame interval requested by the host at stream commit, per stream.
Blinks the board LED to indicate USB state (not mounted / mounted / suspended).

USB Descriptors

Interface	Class driver
0–1	UVC video (control + streaming) — YUY2
2–3	UVC video (control + streaming) — MJPEG

Configuration

Notable tusb_config.h settings:

#define CFG_TUD_VIDEO                       2   // 2 video control interfaces
#define CFG_TUD_VIDEO_STREAMING            2   // 2 video streaming interfaces
#define CFG_TUD_VIDEO_STREAMING_EP_BUFSIZE 256
#define CFG_TUD_VIDEO_STREAMING_BULK       1   // bulk streaming endpoints

Building

CMake:

bash

mkdir build && cd build
cmake -DBOARD=raspberry_pi_pico ..
cmake --build .

Make:

bash

make BOARD=raspberry_pi_pico all

Try it

Two webcam devices appear on the host. On Linux, list them with v4l2-ctl --list-devices and open each with ffplay /dev/videoN or a camera app — one shows YUY2 color bars, the other MJPEG color bars.