[Android] Camera2でプレビューがゆがむ

##問題
Camera2 APIを使用してカメラを使用したいです。
とりあえずカメラのプレビューをTextureViewに表示させることはできたのですが、プレビューが歪んで表示されてしまいます。

具体的にいますと、縦画面時は上下に伸びたような形となり、横画面時は横に伸びたように表示されます。

これをどうにかして正常に表示できるようにしたいです。
##試したこと
端末が対応している撮影サイズを取得して最大サイズをプレビューサイズとすることでうまくいくとの情報がありましたので、撮影サイズのリストを取得し、その最大サイズ（配列の要素0個目）をsetDefaultBufferSizeしてみましたがうまくいきませんでした。

お知恵をお貸しください。

##コード
DriveRecorderActivity.kt

Kotlin
1package caios.android.drive_recorder
2
3import android.content.Context
4import android.content.Intent
5import android.content.pm.PackageManager
6import android.graphics.*
7import android.hardware.camera2.CameraCaptureSession
8import android.hardware.camera2.CameraCharacteristics
9import android.hardware.camera2.CameraDevice
10import android.hardware.camera2.CameraManager
11import android.net.Uri
12import android.os.Build
13import androidx.appcompat.app.AppCompatActivity
14import android.os.Bundle
15import android.provider.Settings
16import android.util.Log
17import android.util.Size
18import android.view.Surface
19import android.view.TextureView
20import android.view.WindowManager
21import androidx.core.app.ActivityCompat
22import androidx.core.content.ContextCompat
23import kotlinx.android.synthetic.main.activity_drive_recorder.*
24import java.lang.Exception
25import java.util.jar.Manifest
26
27class DriveRecorderActivity : AppCompatActivity() {
28
29    private lateinit var textureView: TextureView
30    
31    private var permissionRequestCount = 0
32    private var cameraDevice: CameraDevice? = null
33    private var cameraSize = Size(1920, 1080)
34    private var cameraCaptureSession: CameraCaptureSession? = null
35    
36    private val cameraManager: CameraManager by lazy {
37        getSystemService(Context.CAMERA_SERVICE) as CameraManager
38    }
39    private val cameraId: String by lazy {
40        cameraManager.cameraIdList[0]
41    }
42
43    override fun onCreate(savedInstanceState: Bundle?) {
44        super.onCreate(savedInstanceState)
45        setContentView(R.layout.activity_drive_recorder)
46        
47        textureView = ADR_TextureView
48        configurationTransform()
49    }
50
51    override fun onResume() {
52        super.onResume()
53
54        if (textureView.isAvailable) {
55            checkPermissionAndOpenCamera()
56        }
57        else {
58            textureView.surfaceTextureListener = object : TextureView.SurfaceTextureListener {
59                override fun onSurfaceTextureAvailable(p0: SurfaceTexture?, p1: Int, p2: Int) {
60                    checkPermissionAndOpenCamera()
61                }
62
63                override fun onSurfaceTextureDestroyed(p0: SurfaceTexture?): Boolean {
64                    return true
65                }
66
67                override fun onSurfaceTextureUpdated(p0: SurfaceTexture?) {
68
69                }
70
71                override fun onSurfaceTextureSizeChanged(p0: SurfaceTexture?, p1: Int, p2: Int) {
72                    configurationTransform()
73                }
74            }
75        }
76    }
77    
78    override fun onPause() {
79        super.onPause()
80        closeCamera()
81    }
82
83    private fun openCamera() {
84        if(ActivityCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) return
85        
86        setCameraSize()
87        
88        val cameraStateCallback = object : CameraDevice.StateCallback() {
89            override fun onOpened(p0: CameraDevice) {
90                cameraDevice = p0
91                createCameraPreview()
92            }
93
94            override fun onDisconnected(p0: CameraDevice) {
95                cameraDevice?.close()
96                cameraDevice = null
97            }
98
99            override fun onError(p0: CameraDevice, p1: Int) {
100                cameraDevice?.close()
101                cameraDevice = null
102            }
103        }
104
105        cameraManager.openCamera(cameraId, cameraStateCallback, handler)
106    }
107
108    private fun closeCamera() {
109        cameraCaptureSession?.close()
110        cameraDevice?.close()
111    }
112    
113    private fun createCameraPreview(){
114        try {
115            val surfaceTexture = textureView.surfaceTexture
116            surfaceTexture.setDefaultBufferSize(cameraSize.width, cameraSize.height)
117    
118            val surface = Surface(surfaceTexture)
119            val previewRequestBuilder = cameraDevice!!.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)
120            previewRequestBuilder.addTarget(surface)
121    
122            val captureSessionStateCallback = object : CameraCaptureSession.StateCallback() {
123                override fun onConfigured(p0: CameraCaptureSession) {
124                    cameraCaptureSession = p0
125                    cameraCaptureSession?.setRepeatingRequest(previewRequestBuilder.build(), null, null)
126                }
127        
128                override fun onConfigureFailed(p0: CameraCaptureSession) {
129            
130                }
131            }
132    
133            cameraDevice?.createCaptureSession(listOf(surface), captureSessionStateCallback, null)
134            
135            configurationTransform()
136        }
137        catch (e: Exception){
138            Log.d(G_TAG, "$e")
139        }
140    }
141    
142    private fun setCameraSize() {
143        val characteristic = cameraManager.getCameraCharacteristics(cameraId)
144        val scm = characteristic.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)
145        val mCameraSize = scm?.getOutputSizes(SurfaceTexture::class.java) ?: return
146        
147        for(cameraSize in mCameraSize){
148            Log.d(G_TAG, cameraSize.toString())
149        }
150        
151        cameraSize = mCameraSize[0]
152        
153        configurationTransform()
154    }
155    
156    private fun configurationTransform() {
157        val matrix = Matrix()
158        val centerX = textureView.width / 2f
159        val centerY = textureView.height / 2f
160        val orientation = getTextureViewOrientation() ?: return
161    
162        matrix.postRotate(-orientation.toFloat(), centerX, centerY)
163    
164        textureView.setTransform(matrix)
165    }
166    
167    private fun getTextureViewOrientation(): Int?{
168        try {
169            return when (textureView.display.rotation) {
170                Surface.ROTATION_0   -> 0
171                Surface.ROTATION_90  -> 90
172                Surface.ROTATION_180 -> 180
173                Surface.ROTATION_270 -> 270
174                else                 -> null
175            }
176        }
177        catch (e: Exception){
178            Log.d(G_TAG, "$e")
179            return null
180        }
181    }
182
183    private fun checkPermissionAndOpenCamera() {
184        if (Build.VERSION.SDK_INT >= 23 && ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
185            if(ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.CAMERA) || permissionRequestCount == 0) {
186                ActivityCompat.requestPermissions(this, arrayOf(android.Manifest.permission.CAMERA), 92)
187                permissionRequestCount++
188            }
189            else {
190                val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS, Uri.fromParts("package", packageName, null))
191                startActivity(intent)
192            }
193        }
194        else {
195            openCamera()
196        }
197    }
198
199    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
200        when(requestCode){
201            92 -> {
202                if(ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED){
203                    openCamera()
204                }
205                else {
206                    global.toast(this, "権限不足")
207                }
208            }
209        }
210    }
211}

activity_drive_recorder.xml

XML
1<?xml version="1.0" encoding="utf-8"?>
2<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
3    xmlns:app="http://schemas.android.com/apk/res-auto"
4    xmlns:tools="http://schemas.android.com/tools"
5    android:layout_width="match_parent"
6    android:layout_height="match_parent"
7    android:id="@+id/ADR_RootView"
8    tools:context=".DriveRecorderActivity">
9
10    <TextureView
11        android:id="@+id/ADR_TextureView"
12        android:layout_width="wrap_content"
13        android:layout_height="wrap_content" />
14
15</FrameLayout>