Add --list-cameras

Add an option to list the device cameras.

Co-authored-by: Romain Vimont <rom@rom1v.com>

server/src/main/java/com/genymobile/scrcpy/LogUtils.java

@@ -3,6 +3,12 @@ package com.genymobile.scrcpy;
 import com.genymobile.scrcpy.wrappers.DisplayManager;
 import com.genymobile.scrcpy.wrappers.ServiceManager;
 
+import android.hardware.camera2.CameraAccessException;
+import android.hardware.camera2.CameraCharacteristics;
+import android.hardware.camera2.CameraManager;
+import android.hardware.camera2.params.StreamConfigurationMap;
+import android.media.MediaCodec;
+
 import java.util.List;
 
 public final class LogUtils {
@@ -60,4 +66,48 @@ public final class LogUtils {
         }
         return builder.toString();
     }
+
+    private static String getCameraFacingName(int facing) {
+        switch (facing) {
+            case CameraCharacteristics.LENS_FACING_FRONT:
+                return "front";
+            case CameraCharacteristics.LENS_FACING_BACK:
+                return "back";
+            case CameraCharacteristics.LENS_FACING_EXTERNAL:
+                return "external";
+            default:
+                return "unknown";
+        }
+    }
+
+    public static String buildCameraListMessage() {
+        StringBuilder builder = new StringBuilder("List of cameras:");
+        CameraManager cameraManager = ServiceManager.getCameraManager();
+        try {
+            String[] cameraIds = cameraManager.getCameraIdList();
+            if (cameraIds == null || cameraIds.length == 0) {
+                builder.append("\n    (none)");
+            } else {
+                for (String id : cameraIds) {
+                    builder.append("\n    --video-source=camera --camera=").append(id);
+                    CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(id);
+                    Integer facingInteger = characteristics.get(CameraCharacteristics.LENS_FACING);
+                    if (facingInteger != null) {
+                        int facing = facingInteger;
+                        builder.append("    (").append(getCameraFacingName(facing)).append(')');
+                    }
+
+                    StreamConfigurationMap configs = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
+                    android.util.Size[] sizes = configs.getOutputSizes(MediaCodec.class);
+                    for (android.util.Size size : sizes) {
+                        // TODO remove (just for testing)
+                        builder.append("\n        - " + size.getWidth() + "x" + size.getHeight());
+                    }
+                }
+            }
+        } catch (CameraAccessException e) {
+            builder.append("\n    (access denied)");
+        }
+        return builder.toString();
+    }
 }

server/src/main/java/com/genymobile/scrcpy/Options.java

@@ -38,6 +38,7 @@ public class Options {
 
     private boolean listEncoders;
     private boolean listDisplays;
+    private boolean listCameras;
 
     // Options not used by the scrcpy client, but useful to use scrcpy-server directly
     private boolean sendDeviceMeta = true; // send device name and size
@@ -161,6 +162,10 @@ public class Options {
         return listDisplays;
     }
 
+    public boolean getListCameras() {
+        return listCameras;
+    }
+
     public boolean getSendDeviceMeta() {
         return sendDeviceMeta;
     }
@@ -306,6 +311,9 @@ public class Options {
                 case "list_displays":
                     options.listDisplays = Boolean.parseBoolean(value);
                     break;
+                case "list_cameras":
+                    options.listCameras = Boolean.parseBoolean(value);
+                    break;
                 case "send_device_meta":
                     options.sendDeviceMeta = Boolean.parseBoolean(value);
                     break;

server/src/main/java/com/genymobile/scrcpy/Server.java

@@ -2,6 +2,7 @@ package com.genymobile.scrcpy;
 
 import android.os.BatteryManager;
 import android.os.Build;
+import android.os.Looper;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -99,7 +100,8 @@ public final class Server {
         boolean audio = options.getAudio();
         boolean sendDummyByte = options.getSendDummyByte();
 
-        Workarounds.apply(audio);
+        boolean camera = true;
+        Workarounds.apply(audio, camera);
 
         List<AsyncProcessor> asyncProcessors = new ArrayList<>();
 
@@ -180,7 +182,7 @@ public final class Server {
 
         Ln.initLogLevel(options.getLogLevel());
 
-        if (options.getListEncoders() || options.getListDisplays()) {
+        if (options.getListEncoders() || options.getListDisplays() || options.getListCameras()) {
             if (options.getCleanup()) {
                 CleanUp.unlinkSelf();
             }
@@ -192,6 +194,10 @@ public final class Server {
             if (options.getListDisplays()) {
                 Ln.i(LogUtils.buildDisplayListMessage());
             }
+            if (options.getListCameras()) {
+                Workarounds.apply(false, true);
+                Ln.i(LogUtils.buildCameraListMessage());
+            }
             // Just print the requested data, do not mirror
             return;
         }

server/src/main/java/com/genymobile/scrcpy/Workarounds.java

@@ -28,14 +28,13 @@ public final class Workarounds {
         // not instantiable
     }
 
-    public static void apply(boolean audio) {
+    public static void apply(boolean audio, boolean camera) {
         Workarounds.prepareMainLooper();
 
         boolean mustFillAppInfo = false;
         boolean mustFillBaseContext = false;
         boolean mustFillAppContext = false;
 
-
         if (Build.BRAND.equalsIgnoreCase("meizu")) {
             // Workarounds must be applied for Meizu phones:
             //  - <https://github.com/Genymobile/scrcpy/issues/240>
@@ -65,6 +64,10 @@ public final class Workarounds {
             mustFillAppContext = true;
         }
 
+        if (camera) {
+            mustFillAppInfo = true;
+        }
+
         if (mustFillAppInfo) {
             Workarounds.fillAppInfo();
         }

server/src/main/java/com/genymobile/scrcpy/wrappers/ServiceManager.java

@@ -1,9 +1,15 @@
 package com.genymobile.scrcpy.wrappers;
 
+import com.genymobile.scrcpy.FakeContext;
+import com.genymobile.scrcpy.Workarounds;
+
 import android.annotation.SuppressLint;
+import android.content.Context;
+import android.hardware.camera2.CameraManager;
 import android.os.IBinder;
 import android.os.IInterface;
 
+import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 
@@ -26,6 +32,7 @@ public final class ServiceManager {
     private static StatusBarManager statusBarManager;
     private static ClipboardManager clipboardManager;
     private static ActivityManager activityManager;
+    private static CameraManager cameraManager;
 
     private ServiceManager() {
         /* not instantiable */
@@ -129,4 +136,16 @@ public final class ServiceManager {
 
         return activityManager;
     }
+
+    public static CameraManager getCameraManager() {
+        if (cameraManager == null) {
+            try {
+                Constructor<CameraManager> ctor = CameraManager.class.getDeclaredConstructor(Context.class);
+                cameraManager = ctor.newInstance(FakeContext.get());
+            } catch (Exception e) {
+                throw new AssertionError(e);
+            }
+        }
+        return cameraManager;
+    }
 }