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+# Yet another camera streamer
+
+There's a number of great projects doing an UVC/CSI camera streaming
+on SBC (like Raspberry PI's).
+
+This is yet another camera streamer project that is primarly focused
+on supporting a fully hardware accelerated streaming of MJPEG streams
+and H264 video streams for minimal latency.
+
+This supports well CSI cameras that provide 10-bit Bayer packed format
+from sensor, by using a dedicated ISP of Raspberry PI's.
+
+Take into account that this is a draft project, and is nowhere as complete
+and well supported as (awesome ustreamer)[https://github.com/pikvm/ustreamer].
+This project was inspired by mentioned ustreamer.
+
+## Validate your system
+
+**This streamer does only use hardware, and does not support any software decoding or encoding**.
+It does require system to provide:
+
+1. ISP (`/dev/video13`, `/dev/video14`, `/dev/video15`)
+2. JPEG encoder (`/dev/video31`)
+3. H264 encoder (`/dev/video11`)
+4. JPEG/H264 decoder (for UVC cameras, `/dev/video10`)
+5. At least LTS kernel (5.15) for Raspberry PIs
+
+You can validate the presence of all those devices with:
+
+```bash
+uname -a
+v4l2-ctl --list-devices
+```
+
+## Compile
+
+```bash
+apt-get -y install libavformat-dev libavutil-dev libavcodec-dev libcamera-dev v4l-utils pkg-config build-essential
+make
+sudo make install
+```
+
+## Use it
+
+There are three modes of operation implemented offering different
+compatibility to performance.
+
+### High-compatibility via `libcamera`
+
+This script uses `libcamera` to access camera and provide
+manual and automatic brightness and exposure controls.
+The settings for those are configurable via described below controls.
+
+This due to extra overhead has worse latency than direct decoding
+via ISP.
+
+```bash
+./libcamera_camera.sh -help
+./libcamera_camera.sh -camera-format=YUYV
+```
+
+### High-performance mode via ISP for CSI
+
+This script uses high-performance implementation for directly
+accessing sensor feeds and passing it via DMA into bcm2385 ISP.
+As such it does not implement brightness control similarly to `libcamera`.
+
+```bash
+# This script uses dumped IMX519 parametrs that are feed into bcm2385 ISP module
+# This does not provide automatic brightness control
+# Other sensors can be supported the same way as long as ISP parameters are adapted
+./imx519_camera.sh -help
+./imx519_camera.sh -camera-format=RG10 ...
+```
+
+This mode allows to provide significantly better performance for camera sensors
+than described in specs. For example for Arducam 16MP (using IMX519) it is possible to achieve:
+
+1. 120fps on 1280x720, with latency of about 50ms, where-as documentation says 1280x720x60p
+1. 60fps on 1920x1080, with latency of about 90ms, where-as documentation says 1920x1080x30p
+1. 30fps on 2328x1748, with latency of about 140ms, where-as documentation says 2328x1748x15p
+
+The above was tested with camera connected to Raspberry PI Zero 2W, streaming `MJPEG` over WiFi
+with camera recording https://www.youtube.com/watch?v=e8ZtPSIfWPc from desktop monitor. So, it as
+well measured also a desktop rendering latency.
+
+### High-performance mode via direct decoding for USB
+
+This script uses direct decoding or passthrough of MJPEG or H264 streams from UVC camera into
+re-encoded stream provided over web-interface.
+
+```bash
+./usb_camera.sh -help
+./usb_camera.sh -camera-format=H264 ...
+./usb_camera.sh -camera-format=MJPEG ...
+```
+
+## HTTP web server
+
+All streams are exposed over very simple HTTP server, providing different streams for different purposes:
+
+- `http://<ip>:8080/` - index page
+- `http://<ip>:8080/snapshot` - provide JPEG snapshot (works well everywhere)
+- `http://<ip>:8080/stream` - provide M-JPEG stream (works well everywhere)
+- `http://<ip>:8080/video` - provide H264 in-browser muxed video output (using https://github.com/samirkumardas/jmuxer/, works only in Desktop Chrome)
+- `http://<ip>:8080/video.mp4` or `http://<ip>:8080/video.mkv` - provide remuxed `mkv` or `mp4` stream (uses `ffmpeg` to remux, works as of now only in Desktop Chrome and Safari)
+
+### Resolution
+
+Camera capture and resolution exposed is controlled by threee parameters:
+
+- `-camera-width` and `-camera-height` define capture resolution
+- (ISP mode only) `-camera-high_res_factor` a default resolution exposed via HTTP (`exposed_width = camera_width / factor, exposed_height = camera_height / factor`)
+- (ISP mode only) `-camera-low_res_factor` a low-resolution exposed via HTTP when `?res=low` is added (ex. `http://<ip>:8080/snapshot`)
+
+## List all available controls
+
+You can view all available configuration parameters by adding `-log-verbose`
+to one of the above commands, like:
+
+```bash
+./libcamera_camera.sh -log-verbose ...
+```
+
+Depending on control they have to be used for camera, ISP, or JPEG or H264 codec:
+
+```bash
+# specify camera option
+-camera-options=brightness=1000
+
+# specify ISP option
+-camera-isp.options=digital_gain=1000
+
+# specify H264 option
+-camera-h264.options=bitrate=10000000
+
+# specify JPEG option
+-camera-jpeg.options=compression_quality=60
+```
+
+
+## License
+
+GNU General Public License v3.0