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diff --git a/examples/device/video_capture_2ch/README.md b/examples/device/video_capture_2ch/README.md new file mode 100644 index 000000000..f55253157 --- /dev/null +++ b/examples/device/video_capture_2ch/README.md @@ -0,0 +1,49 @@ +# 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: + +```c +#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. |