\u4e3a\u4e86\u5feb\u901f\u4f7f\u7528Android\u8bbe\u5907\u7684\u76f8\u673a \u6253\u5305\u4e86camera2\u5e93
\n\u8be5\u5e93\u53ea\u9700\u8981\u5f88\u5c11\u7684\u914d\u7f6e\u5373\u53ef\u83b7\u53d6\u76f8\u673a\u7684\u90e8\u5206\u91cd\u8981\u53c2\u6570\uff0c\u5e76\u542f\u7528\u5176\u4e2d\u4e00\u4e2a\u9009\u4e2d\u7684\u76f8\u673a<\/p>\n
init(applicationContext)<\/code>\u83b7\u53d6\u4e0a\u4e0b\u6587<\/li>\n- \u4f7f\u7528
getCamerasList()<\/code>\u83b7\u53d6\u76f8\u673a\u53c2\u6570<\/li>\n- \u4f7f\u7528
setFrameCallback()<\/code>\u8bbe\u7f6e\u56de\u8c03<\/li>\n- \u4f7f\u7528
setCameraParameters()<\/code>\u9009\u62e9\u76ee\u6807\u76f8\u673a<\/li>\n- \u4f7f\u7528
closeCamera()<\/code>\u5173\u95ed\u76f8\u673a<\/li>\n<\/ol>\n\u9644\u4ef6<\/h2>\n
\u6e90\u7801\uff1a<\/p>\n
import android.Manifest\nimport android.content.Context\nimport android.graphics.ImageFormat\nimport android.hardware.camera2.CameraAccessException\nimport android.hardware.camera2.CameraCaptureSession\nimport android.hardware.camera2.CameraCharacteristics\nimport android.hardware.camera2.CameraDevice\nimport android.hardware.camera2.CameraManager\nimport android.hardware.camera2.CaptureRequest\nimport android.media.Image\nimport android.media.ImageReader\nimport android.media.MediaRecorder\nimport android.os.Handler\nimport android.os.HandlerThread\nimport android.util.Log\nimport android.util.Range\nimport android.util.Size\nimport androidx.annotation.RequiresPermission\n\n\/\/ \u5206\u8fa8\u7387\u4e0e\u5e27\u7387\u4fe1\u606f\u7c7b\ndata class ResInfo(\n val width: Int,\n val height: Int,\n val fpsRanges: List<Range<Int>> \/\/ \u5e27\u7387\u8303\u56f4\u5217\u8868\uff08\u5982[30,30]\u6216[60,120]\uff09\n)\n\ndata class CameraInfo_t (\n var id: Int = 0,\n var focalLength: Float = 0.0f,\n var equalsFocalLength: Float = 0.0f,\n var resolutions: List<ResInfo> = emptyList()\n)\n\nobject CameraController {\n\n private lateinit var applicationContext: Context\n\n fun init(applicationContext: Context) {\n this.applicationContext = applicationContext.applicationContext\n }\n\n private var CameraInfos: MutableList<CameraInfo_t> = mutableListOf()\n private lateinit var cameraManager: CameraManager\n private lateinit var cameraDevice: CameraDevice\n private lateinit var imageReader: ImageReader\n\n private lateinit var backgroundThread: HandlerThread\n private lateinit var backgroundHandler: Handler\n\n private lateinit var captureSession: CameraCaptureSession\n\n private var frameCallback: FrameCallback? = null\n\n private var fpsRange: Range<Int>? = null\n\n\n fun interface FrameCallback {\n fun onFrameAvailable(imageData: Image, width: Int, height: Int)\n }\n\n fun setFrameCallback(callback: FrameCallback) {\n this.frameCallback = callback\n }\n\n \/\/ \u542f\u52a8\u540e\u53f0\u7ebf\u7a0b\n private fun startBackgroundThread() {\n Log.d(\"startBackgroundThread\",\"Active\")\n backgroundThread = HandlerThread(\"CameraBackground\")\n backgroundThread.start()\n backgroundHandler = Handler(backgroundThread.looper)\n }\n\n \/\/ \u505c\u6b62\u540e\u53f0\u7ebf\u7a0b\n private fun stopBackgroundThread() {\n backgroundThread.quitSafely()\n try {\n backgroundThread.join()\n } catch (e: InterruptedException) {\n e.printStackTrace()\n }\n }\n\n \/\/ \u83b7\u53d6camera\u4fe1\u606f\u5217\u8868\n public fun getCamerasList():List<CameraInfo_t> {\n cameraManager = applicationContext.getSystemService(Context.CAMERA_SERVICE) as CameraManager\n try {\n val cameraIds = cameraManager.cameraIdList\n for (cameraId in cameraIds) {\n var cameraInfo = CameraInfo_t()\n Log.d(\"ID\",cameraId)\n cameraInfo.id = cameraId.toInt()\n val characteristics = cameraManager.getCameraCharacteristics(cameraId)\n\n \/\/ 1. \u83b7\u53d6\u6240\u6709\u652f\u6301\u7684\u5206\u8fa8\u7387\u53ca\u5e27\u7387\u8303\u56f4\n val streamMap = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)\n streamMap?.let { map ->\n val videoSizes = map.getOutputSizes(MediaRecorder::class.java)\n cameraInfo.resolutions = videoSizes?.map { size ->\n val fpsRanges = if (map.highSpeedVideoSizes.contains(size)) {\n \/\/ \u4ec5\u9ad8\u5e27\u7387\u5206\u8fa8\u7387\u53ef\u8c03\u7528\u6b64\u65b9\u6cd5\n map.getHighSpeedVideoFpsRangesFor(size)?.toList() ?: emptyList()\n } else {\n \/\/ \u666e\u901a\u5e27\u7387\uff1a\u83b7\u53d6\u6807\u51c6\u5e27\u7387\u8303\u56f4\n map.getOutputMinFrameDuration(MediaRecorder::class.java, size)?.let {\n val fps = (1_000_000_000.0 \/ it).toInt()\n listOf(Range(fps, fps)) \/\/ \u6784\u9020\u56fa\u5b9a\u5e27\u7387\u8303\u56f4\n } ?: emptyList()\n }\n ResInfo(size.width, size.height, fpsRanges)\n } ?: emptyList()\n }\n\n cameraInfo.resolutions.forEach { i ->\n Log.d(\"CameraInfo\", \"\u5206\u8fa8\u7387: ${i.width} * ${i.height} \u5e27\u7387: ${i.fpsRanges} \" )\n }\n\n\n val focalLengths = characteristics.get(CameraCharacteristics.LENS_INFO_AVAILABLE_FOCAL_LENGTHS)\n val sensorSize = characteristics.get(CameraCharacteristics.SENSOR_INFO_PHYSICAL_SIZE)\n\n val diagonal35mm = 43.27f\n val sensorDiagonal = kotlin.math.hypot(sensorSize!!.width, sensorSize.height)\n\n focalLengths?.let { lengths ->\n if(lengths.isNotEmpty()) {\n val mainFocalLength = lengths[0]\n val equivalentFocalLength = mainFocalLength * (diagonal35mm \/ sensorDiagonal)\n Log.d(\"CameraInfo\", \"\u76f8\u673a\u7126\u8ddd: $mainFocalLength mm, \u7b49\u6548\u7126\u8ddd: $equivalentFocalLength mm\")\n cameraInfo.focalLength = mainFocalLength\n cameraInfo.equalsFocalLength = equivalentFocalLength\n }\n }\n CameraInfos.add(cameraInfo)\n }\n } catch (e: CameraAccessException) {\n e.printStackTrace()\n }\n return CameraInfos\n }\n\n \/\/\u8bbe\u7f6ecamera\u5e76\u542f\u52a8\n @RequiresPermission(Manifest.permission.CAMERA)\n public fun setCameraParameters(id:Int, width:Int, height:Int, fps:Int) {\n val characteristics = cameraManager.getCameraCharacteristics(id.toString())\n fpsRange = chooseOptimalFpsRange(\n characteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES)\n ?: arrayOf(),\n fps\n )\n Log.d(\"fpsRange\",\"$fpsRange\")\n try {\n startBackgroundThread() \/\/\u542f\u52a8\u540e\u53f0\u8fdb\u7a0b\n imageReader = ImageReader.newInstance( \/\/\u914d\u7f6eImageReader\n width,\n height,\n ImageFormat.YUV_420_888,\n 2\n ).apply {\n setOnImageAvailableListener({ reader ->\n \/\/Log.d(\"setOnImageAvailableListener\",\"Active\")\n val image = reader.acquireLatestImage()\n image?.let {\n val buffer = it\n frameCallback?.onFrameAvailable(buffer,it.width,it.height)\n it.close()\n }\n }, backgroundHandler)\n }\n cameraManager!!.openCamera(\n id.toString(),\n object : CameraDevice.StateCallback() {\n override fun onOpened(camera: CameraDevice) {\n Log.d(\"cameraManager\",\"onOpened\")\n cameraDevice = camera\n startPreview(width,height,fps)\n }\n\n override fun onDisconnected(camera: CameraDevice) {\n Log.d(\"cameraManager\",\"onDisconnected\")\n closeCamera()\n }\n\n override fun onError(\n camera: CameraDevice,\n error: Int\n ) {\n Log.e(\"cameraManager\",\"onError:$error\")\n closeCamera()\n }\n },\n backgroundHandler\n )\n } catch (e:CameraAccessException) {\n Log.e(\"setCameraParameters\",e.toString())\n }\n }\n\n private fun startPreview(width:Int, height:Int, fps:Int) {\n try {\n val imageSurface = imageReader.surface\n val captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)\n captureRequestBuilder.addTarget(imageSurface)\n fpsRange?.let {\n captureRequestBuilder.set(\n CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE,\n it\n )\n }\n cameraDevice.createCaptureSession(\n listOf(imageSurface),\n object : CameraCaptureSession.StateCallback() {\n override fun onConfigured(session: CameraCaptureSession) {\n captureSession = session\n updatePreview(captureRequestBuilder)\n\n }\n\n override fun onConfigureFailed(session: CameraCaptureSession) {\n \/\/TODO(\"Not yet implemented\")\n }\n\n },\n backgroundHandler\n )\n } catch (e:CameraAccessException) {\n Log.e(\"startPreview\",e.toString())\n }\n\n }\n private fun updatePreview(requestBuilder: CaptureRequest.Builder) {\n try {\n captureSession?.setRepeatingRequest(\n requestBuilder.build(),\n null,\n backgroundHandler\n )\n } catch (e: CameraAccessException) {\n e.printStackTrace()\n }\n }\n \/\/\u5173\u95edcamera\n public fun closeCamera() {\n if (::cameraDevice.isInitialized) {\n cameraDevice.close()\n stopBackgroundThread()\n }\n }\n private fun convertImageToByteArray(image: Image): ByteArray {\n val planes = image.planes\n val yBuffer = planes[0].buffer\n val uBuffer = planes[1].buffer\n val vBuffer = planes[2].buffer\n val ySize = yBuffer.remaining()\n val uSize = uBuffer.remaining()\n val vSize = vBuffer.remaining()\n\n val nv21 = ByteArray(ySize + uSize + vSize)\n \/\/ \u590d\u5236 Y \u6570\u636e\n yBuffer.get(nv21, 0, ySize)\n \/\/ \u590d\u5236 UV \u6570\u636e\n vBuffer.get(nv21, ySize, vSize)\n uBuffer.get(nv21, ySize + vSize, uSize)\n\n return nv21\n }\n \/\/ \u9009\u62e9\u6700\u4f73\u5c3a\u5bf8\n private fun chooseOptimalSize(\n choices: Array<Size>,\n width: Int,\n height: Int\n ): Size {\n val desiredRatio = width.toFloat() \/ height\n var optimalSize = choices[0]\n var minDiff = Float.MAX_VALUE\n\n for (size in choices) {\n val ratio = size.width.toFloat() \/ size.height\n val diff = Math.abs(ratio - desiredRatio)\n if (diff < minDiff) {\n optimalSize = size\n minDiff = diff\n }\n }\n\n return optimalSize\n }\n\n \/\/ \u9009\u62e9\u6700\u4f73 FPS \u8303\u56f4\n private fun chooseOptimalFpsRange(\n ranges: Array<Range<Int>>,\n desiredFps: Int\n ): Range<Int>? {\n if (ranges.isEmpty()) return null\n\n \/\/ \u627e\u5230\u6700\u63a5\u8fd1 desiredFps \u7684\u8303\u56f4\n var optimalRange: Range<Int>? = null\n var minDiff = Int.MAX_VALUE\n\n for (range in ranges) {\n \/\/ \u68c0\u67e5\u8303\u56f4\u662f\u5426\u5305\u542b desiredFps\n if (range.lower <= desiredFps && range.upper >= desiredFps) {\n \/\/ \u8ba1\u7b97\u4e0e desiredFps \u7684\u5dee\u5f02\n val diff = (range.upper - desiredFps) + (desiredFps - range.lower)\n if (diff < minDiff) {\n minDiff = diff\n optimalRange = range\n }\n }\n }\n\n \/\/ \u5982\u679c\u6ca1\u6709\u627e\u5230\u5305\u542b desiredFps \u7684\u8303\u56f4\uff0c\u8fd4\u56de\u6700\u5927\u8303\u56f4\n return optimalRange ?: ranges.maxByOrNull { it.upper }\n }\n}\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u4e3a\u4e86\u5feb\u901f\u4f7f\u7528Android\u8bbe\u5907\u7684\u76f8\u673a \u6253\u5305\u4e86camera2\u5e93
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