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The Light L16 is a weird little camera with sixteen lens.
It's cheapish now on the 2nd hand market as it's been discontinued.
I would like to be able to read the raw LRI files it puts out. They are, however,
proprietary and not described anywhere. This is my effort.
[helloavo/Light-L16-Archive](https://github.com/helloavo/Light-L16-Archive):
helloavo archived a lot of files and data related to the camera here and I am
very, very grateful for that. I'm using the `.class` files they ripped from the
APK. I then used quiltflower to decompile the entire directory. I used this
command: `java -jar quiltflower.jar -dgs=1 Light-L16-Archive/APKs/light_camera_decompiled`
And it's proved useful! In `light/co/camera/proto/LightHeader.java` we can get an idea
of the file header?
Can we parse the message in the header with the protobuf as described in: [dllu/lri-rs](https://github.com/dllu/lri-rs/blob/main/proto/lightheader.proto)?
### File Header
The LightHeader seems to consist of a header followed be a proto buf message
that then gets appended to it.
The header is **little endian**
#### File Header Structure
This is only sometimes the case. It seems that "header length (32)" field is sometimes a lot *a lot* bigger. in that case you have the sensor data. perhaps then the message length is some inidication to protobuf data? perhaps it's nothing? padding?
The header is 32 bytes long. and goes as follows:
| bytes | meaning |
| ----- | ------- |
| 4 | Magic Number: "LELR" |
| 8 | header length (32) + protobuf message length |
| 8 | header length (32) |
| 4 | message length |
| 1 | type (?) |
| 7 | reserved |
and then follows the message which already has a known length
## Image Sensors
Listen in sensor_type.proto of lri-rs
| Sensor | Resolutions | Output |
| - | - | - |
| AR0835HS | 8 Mp: 3264 × 2448, 6 Mp: 3264 × 1836 | 10−bit Raw, 10−to−8 bit A−Law, 8/6−bit DPCM |
| AR1335 | 4208 × 3120 | DPCM: 10-8-10, 10-6-10 |
| IMX386 | 4032 x 3024 | ? |
|
