NEW_API: Add android.hardware.Camera.CameraInfo#canDisableShutterSound

Allow applications to check if the camera shutter sound can be
disabled.

Bug: 7172643
Change-Id: I3e9184325d3676b24830cc5418ebca8dcade8697

Author: Eino-Ville Talvala

api/current.txt

@@ -9755,6 +9755,7 @@ package android.hardware {
     ctor public Camera.CameraInfo();
     field public static final int CAMERA_FACING_BACK = 0; // 0x0
     field public static final int CAMERA_FACING_FRONT = 1; // 0x1
+    field public boolean canDisableShutterSound;
     field public int facing;
     field public int orientation;
   }

core/java/android/hardware/Camera.java

@@ -233,6 +233,21 @@ public static class CameraInfo {
          * @see Parameters#setJpegThumbnailSize(int, int)
          */
         public int orientation;
+
+        /**
+         * <p>Whether the shutter sound can be disabled.</p>
+         *
+         * <p>On some devices, the camera shutter sound cannot be turned off
+         * through {@link #enableShutterSound enableShutterSound}. This field
+         * can be used to determine whether a call to disable the shutter sound
+         * will succeed.</p>
+         *
+         * <p>If this field is set to true, then a call of
+         * {@code enableShutterSound(false)} will be successful. If set to
+         * false, then that call will fail, and the shutter sound will be played
+         * when {@link Camera#takePicture takePicture} is called.</p>
+         */
+        public boolean canDisableShutterSound;
     };
 
     /**

core/jni/android_hardware_Camera.cpp

@@ -23,6 +23,7 @@
 #include "JNIHelp.h"
 #include "android_runtime/AndroidRuntime.h"
 
+#include <cutils/properties.h>
 #include <utils/Vector.h>
 
 #include <gui/SurfaceTexture.h>
@@ -38,6 +39,7 @@ struct fields_t {
     jfieldID    surfaceTexture;
     jfieldID    facing;
     jfieldID    orientation;
+    jfieldID    canDisableShutterSound;
     jfieldID    face_rect;
     jfieldID    face_score;
     jfieldID    rect_left;
@@ -453,6 +455,12 @@ static void android_hardware_Camera_getCameraInfo(JNIEnv *env, jobject thiz,
     }
     env->SetIntField(info_obj, fields.facing, cameraInfo.facing);
     env->SetIntField(info_obj, fields.orientation, cameraInfo.orientation);
+
+    char value[PROPERTY_VALUE_MAX];
+    property_get("ro.camera.sound.forced", value, "0");
+    jboolean canDisableShutterSound = (strncmp(value, "0", 2) == 0);
+    env->SetBooleanField(info_obj, fields.canDisableShutterSound,
+            canDisableShutterSound);
 }
 
 // connect to camera service
@@ -962,6 +970,8 @@ int register_android_hardware_Camera(JNIEnv *env)
           ANDROID_GRAPHICS_SURFACETEXTURE_JNI_ID, "I", &fields.surfaceTexture },
         { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
         { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
+        { "android/hardware/Camera$CameraInfo", "canDisableShutterSound",   "Z",
+          &fields.canDisableShutterSound },
         { "android/hardware/Camera$Face", "rect", "Landroid/graphics/Rect;", &fields.face_rect },
         { "android/hardware/Camera$Face", "score", "I", &fields.face_score },
         { "android/graphics/Rect", "left", "I", &fields.rect_left },