The front camera returns null metadata🐛

[ghost]

What were you trying to do?

ANDROID

I was trying to take a picture with the method takePhoto() and with the front facing camera and it returns this metadata:

{
   "Orientation":0,
   "{Exif}":{
      "ApertureValue":0,
      "BrightnessValue":0,
      "ColorSpace":1,
      "DateTimeDigitized":null,
      "DateTimeOriginal":null,
      "ExifVersion":null,
      "ExposureBiasValue":0,
      "ExposureMode":0,
      "ExposureProgram":0,
      "ExposureTime":0,
      "FNumber":0,
      "Flash":1,
      "FocalLenIn35mmFilm":0,
      "FocalLength":0,
      "ISOSpeedRatings":[
         
      ],
      "LensMake":null,
      "LensModel":null,
      "LensSpecification":[
         
      ],
      "MeteringMode":0,
      "OffsetTime":null,
      "OffsetTimeDigitized":null,
      "OffsetTimeOriginal":null,
      "PixelXDimension":0,
      "PixelYDimension":0,
      "SceneType":1,
      "SensingMethod":1,
      "ShutterSpeedValue":0,
      "SubjectArea":[
         
      ],
      "SubsecTimeDigitized":null,
      "SubsecTimeOriginal":null,
      "WhiteBalance":0
   },
   "{TIFF}":{
      "DateTime":null,
      "Make":null,
      "Model":null,
      "ResolutionUnit":0,
      "Software":null,
      "XResolution":0,
      "YResolution":0
   }
}

I need the FocalLength and the FocalLenIn35mmFilm but it is impossible to get it.
The back camera metadata works perfectly btw.

Reproduceable Code

const photo = await cameraRef.current.takePhoto({});

console.log(photo.metadata);

What happened instead?

It returned this null metadata:

{
   "Orientation":0,
   "{Exif}":{
      "ApertureValue":0,
      "BrightnessValue":0,
      "ColorSpace":1,
      "DateTimeDigitized":null,
      "DateTimeOriginal":null,
      "ExifVersion":null,
      "ExposureBiasValue":0,
      "ExposureMode":0,
      "ExposureProgram":0,
      "ExposureTime":0,
      "FNumber":0,
      "Flash":1,
      "FocalLenIn35mmFilm":0,
      "FocalLength":0,
      "ISOSpeedRatings":[
         
      ],
      "LensMake":null,
      "LensModel":null,
      "LensSpecification":[
         
      ],
      "MeteringMode":0,
      "OffsetTime":null,
      "OffsetTimeDigitized":null,
      "OffsetTimeOriginal":null,
      "PixelXDimension":0,
      "PixelYDimension":0,
      "SceneType":1,
      "SensingMethod":1,
      "ShutterSpeedValue":0,
      "SubjectArea":[
         
      ],
      "SubsecTimeDigitized":null,
      "SubsecTimeOriginal":null,
      "WhiteBalance":0
   },
   "{TIFF}":{
      "DateTime":null,
      "Make":null,
      "Model":null,
      "ResolutionUnit":0,
      "Software":null,
      "XResolution":0,
      "YResolution":0
   }
}

Relevant log output

{
   "Orientation":0,
   "{Exif}":{
      "ApertureValue":0,
      "BrightnessValue":0,
      "ColorSpace":1,
      "DateTimeDigitized":null,
      "DateTimeOriginal":null,
      "ExifVersion":null,
      "ExposureBiasValue":0,
      "ExposureMode":0,
      "ExposureProgram":0,
      "ExposureTime":0,
      "FNumber":0,
      "Flash":1,
      "FocalLenIn35mmFilm":0,
      "FocalLength":0,
      "ISOSpeedRatings":[
         
      ],
      "LensMake":null,
      "LensModel":null,
      "LensSpecification":[
         
      ],
      "MeteringMode":0,
      "OffsetTime":null,
      "OffsetTimeDigitized":null,
      "OffsetTimeOriginal":null,
      "PixelXDimension":0,
      "PixelYDimension":0,
      "SceneType":1,
      "SensingMethod":1,
      "ShutterSpeedValue":0,
      "SubjectArea":[
         
      ],
      "SubsecTimeDigitized":null,
      "SubsecTimeOriginal":null,
      "WhiteBalance":0
   },
   "{TIFF}":{
      "DateTime":null,
      "Make":null,
      "Model":null,
      "ResolutionUnit":0,
      "Software":null,
      "XResolution":0,
      "YResolution":0
   }
}

Device

OnePlus 8T (Android 12)

VisionCamera Version

2.13.3

Additional information

• I am using Expo
• I have read the Troubleshooting Guide
• I agree to follow this project's Code of Conduct
• I searched for similar issues in this repository and found none.

[mrousavy]

Huh this is really weird, apparently the native camera library cannot get that value, hence it's default value of 0.

react-native-vision-camera/android/src/main/java/com/mrousavy/camera/utils/ExifInterface+buildMetadataMap.kt

Line 30 in fb2156e

exifMap.putInt("FocalLenIn35mmFilm", this.getAttributeInt(ExifInterface.TAG_FOCAL_LENGTH_IN_35MM_FILM, 0))

I don't think I'm doing anything wrong here, might be an issue with CameraX?

[aguedob]

Same issue here using a couple of Samsung devices: frontal camera returns null Exif data and Orientation is always 0

[ksegla]

I have the same issue. Samsung devices too.

[AjeetSingh2016]

Did anyone find out the solution

[mrousavy]

Hey! I've rewritten the entire Android codebase of VisionCamera from CameraX to Camera2 in the efforts of ✨ VisionCamera V3.

I just now completed the Camera2 rewrite and I believe the core structure is running, but there might be some edge cases to iron out. Can you try and test the PR #1674 for me to see if you can still reproduce this issue here?

Here's an instruction on how you can test that: #1674 (comment)

If the issue cannot be reproduced with that version/PR anymore, then hoorayy, I fixed it! 🎉
Otherwise please let me know and I'll keep this issue open to keep track of it.

Thank you!