override fun analyze()

in CameraXBasic/app/src/main/java/com/android/example/cameraxbasic/fragments/CameraFragment.kt [639:678]
30 lines of code
4 McCabe index (conditional complexity)

        override fun analyze(image: ImageProxy) {
            // If there are no listeners attached, we don't need to perform analysis
            if (listeners.isEmpty()) {
                image.close()
                return
            }

            // Keep track of frames analyzed
            val currentTime = System.currentTimeMillis()
            frameTimestamps.push(currentTime)

            // Compute the FPS using a moving average
            while (frameTimestamps.size >= frameRateWindow) frameTimestamps.removeLast()
            val timestampFirst = frameTimestamps.peekFirst() ?: currentTime
            val timestampLast = frameTimestamps.peekLast() ?: currentTime
            framesPerSecond = 1.0 / ((timestampFirst - timestampLast) /
                    frameTimestamps.size.coerceAtLeast(1).toDouble()) * 1000.0

            // Analysis could take an arbitrarily long amount of time
            // Since we are running in a different thread, it won't stall other use cases

            lastAnalyzedTimestamp = frameTimestamps.first

            // Since format in ImageAnalysis is YUV, image.planes[0] contains the luminance plane
            val buffer = image.planes[0].buffer

            // Extract image data from callback object
            val data = buffer.toByteArray()

            // Convert the data into an array of pixel values ranging 0-255
            val pixels = data.map { it.toInt() and 0xFF }

            // Compute average luminance for the image
            val luma = pixels.average()

            // Call all listeners with new value
            listeners.forEach { it(luma) }

            image.close()
        }