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get brightness value from CMSampleBuffer
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| func getBrightnessValue(from sampleBuffer: CMSampleBuffer) -> Float { | |
| guard | |
| let metadataDict = CMCopyDictionaryOfAttachments(nil, sampleBuffer, kCMAttachmentMode_ShouldPropagate) as? [String: Any], | |
| let exifMetadata = metadataDict[String(kCGImagePropertyExifDictionary)] as? [String: Any], | |
| let brightnessValue = exifMetadata[String(kCGImagePropertyExifBrightnessValue)] as? Float | |
| else { return 0.0 } | |
| return brightnessValue | |
| } |
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