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diff --git a/README.md b/README.md new file mode 100644 index 0000000..06dade2 --- /dev/null +++ b/README.md @@ -0,0 +1,42 @@ +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 \ No newline at end of file |