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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?
### File Header
The file 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
HEADER_LENGTH = 28 + MAGIC_ID length (so 32)
MAGIC_ID: bytes making up ascii "LELR"
long: protobuf message length + HEADER_LENGTH
long: HEADER_LENGTH
int: message length
byte: type (passed to constructor with message)
reserved: 7 bytes
encoded protobuf message
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
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