Add LogarithmicVolumeScale to VolumeScale enum.

Change-Id: I0b556b5f705825fc8c8135305bda4bc860ffbf14
Reviewed-by: Christian Stromme <christian.stromme@qt.io>

2 files changed, 94 insertions, 0 deletions

diff --git a/tests/auto/unit/qaudionamespace/tst_qaudionamespace.cpp b/tests/auto/unit/qaudionamespace/tst_qaudionamespace.cpp
index 7907cd290..5cd89ec3e 100644
--- a/tests/auto/unit/qaudionamespace/tst_qaudionamespace.cpp
+++ b/tests/auto/unit/qaudionamespace/tst_qaudionamespace.cpp
@@ -152,6 +152,13 @@ void tst_QAudioNamespace::convertVolume_data()
     QTest::newRow("0.72 from linear to cubic") << qreal(0.72) << QAudio::LinearVolumeScale << QAudio::CubicVolumeScale << qreal(0.89);
     QTest::newRow("1.0 from linear to cubic") << qreal(1.0) << QAudio::LinearVolumeScale << QAudio::CubicVolumeScale << qreal(1.0);
 
+    QTest::newRow("-1.0 from linear to logarithmic") << qreal(-1.0) << QAudio::LinearVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.0);
+    QTest::newRow("0.0 from linear to logarithmic") << qreal(0.0) << QAudio::LinearVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.0);
+    QTest::newRow("0.33 from linear to logarithmic") << qreal(0.33) << QAudio::LinearVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.78);
+    QTest::newRow("0.5 from linear to logarithmic") << qreal(0.5) << QAudio::LinearVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.9);
+    QTest::newRow("0.72 from linear to logarithmic") << qreal(0.72) << QAudio::LinearVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.96);
+    QTest::newRow("1.0 from linear to logarithmic") << qreal(1.0) << QAudio::LinearVolumeScale << QAudio::LogarithmicVolumeScale << qreal(1.0);
+
     QTest::newRow("-1.0 from linear to decibel") << qreal(-1.0) << QAudio::LinearVolumeScale << QAudio::DecibelVolumeScale << qreal(-200);
     QTest::newRow("0.0 from linear to decibel") << qreal(0.0) << QAudio::LinearVolumeScale << QAudio::DecibelVolumeScale << qreal(-200);
     QTest::newRow("0.33 from linear to decibel") << qreal(0.33) << QAudio::LinearVolumeScale << QAudio::DecibelVolumeScale << qreal(-9.63);
@@ -171,6 +178,13 @@ void tst_QAudioNamespace::convertVolume_data()
     QTest::newRow("0.5 from cubic to cubic") << qreal(0.5) << QAudio::CubicVolumeScale << QAudio::CubicVolumeScale << qreal(0.5);
     QTest::newRow("1.0 from cubic to cubic") << qreal(1.0) << QAudio::CubicVolumeScale << QAudio::CubicVolumeScale << qreal(1.0);
 
+    QTest::newRow("-1.0 from cubic to logarithmic") << qreal(-1.0) << QAudio::CubicVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.0);
+    QTest::newRow("0.0 from cubic to logarithmic") << qreal(0.0) << QAudio::CubicVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.0);
+    QTest::newRow("0.33 from cubic to logarithmic") << qreal(0.33) << QAudio::CubicVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.15);
+    QTest::newRow("0.5 from cubic to logarithmic") << qreal(0.5) << QAudio::CubicVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.44);
+    QTest::newRow("0.72 from cubic to logarithmic") << qreal(0.72) << QAudio::CubicVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.82);
+    QTest::newRow("1.0 from cubic to logarithmic") << qreal(1.0) << QAudio::CubicVolumeScale << QAudio::LogarithmicVolumeScale << qreal(1.0);
+
     QTest::newRow("-1.0 from cubic to decibel") << qreal(-1.0) << QAudio::CubicVolumeScale << QAudio::DecibelVolumeScale << qreal(-200);
     QTest::newRow("0.0 from cubic to decibel") << qreal(0.0) << QAudio::CubicVolumeScale << QAudio::DecibelVolumeScale << qreal(-200);
     QTest::newRow("0.33 from cubic to decibel") << qreal(0.33) << QAudio::CubicVolumeScale << QAudio::DecibelVolumeScale << qreal(-28.89);
@@ -178,6 +192,32 @@ void tst_QAudioNamespace::convertVolume_data()
     QTest::newRow("0.72 from cubic to decibel") << qreal(0.72) << QAudio::CubicVolumeScale << QAudio::DecibelVolumeScale << qreal(-8.56);
     QTest::newRow("1.0 from cubic to decibel") << qreal(1.0) << QAudio::CubicVolumeScale << QAudio::DecibelVolumeScale << qreal(0);
 
+    QTest::newRow("-1.0 from logarithmic to linear") << qreal(-1.0) << QAudio::LogarithmicVolumeScale << QAudio::LinearVolumeScale << qreal(0.0);
+    QTest::newRow("0.0 from logarithmic to linear") << qreal(0.0) << QAudio::LogarithmicVolumeScale << QAudio::LinearVolumeScale << qreal(0.0);
+    QTest::newRow("0.33 from logarithmic to linear") << qreal(0.33) << QAudio::LogarithmicVolumeScale << QAudio::LinearVolumeScale << qreal(0.09);
+    QTest::newRow("0.5 from logarithmic to linear") << qreal(0.5) << QAudio::LogarithmicVolumeScale << QAudio::LinearVolumeScale << qreal(0.15);
+    QTest::newRow("0.72 from logarithmic to linear") << qreal(0.72) << QAudio::LogarithmicVolumeScale << QAudio::LinearVolumeScale << qreal(0.28);
+    QTest::newRow("1.0 from logarithmic to linear") << qreal(1.0) << QAudio::LogarithmicVolumeScale << QAudio::LinearVolumeScale << qreal(1.0);
+
+    QTest::newRow("-1.0 from logarithmic to cubic") << qreal(-1.0) << QAudio::LogarithmicVolumeScale << QAudio::CubicVolumeScale << qreal(0.0);
+    QTest::newRow("0.0 from logarithmic to cubic") << qreal(0.0) << QAudio::LogarithmicVolumeScale << QAudio::CubicVolumeScale << qreal(0.0);
+    QTest::newRow("0.33 from logarithmic to cubic") << qreal(0.33) << QAudio::LogarithmicVolumeScale << QAudio::CubicVolumeScale << qreal(0.44);
+    QTest::newRow("0.5 from logarithmic to cubic") << qreal(0.5) << QAudio::LogarithmicVolumeScale << QAudio::CubicVolumeScale << qreal(0.53);
+    QTest::newRow("0.72 from logarithmic to cubic") << qreal(0.72) << QAudio::LogarithmicVolumeScale << QAudio::CubicVolumeScale << qreal(0.65);
+    QTest::newRow("1.0 from logarithmic to cubic") << qreal(1.0) << QAudio::LogarithmicVolumeScale << QAudio::CubicVolumeScale << qreal(1.0);
+
+    QTest::newRow("-1.0 from logarithmic to logarithmic") << qreal(-1.0) << QAudio::LogarithmicVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.0);
+    QTest::newRow("0.0 from logarithmic to logarithmic") << qreal(0.0) << QAudio::LogarithmicVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.0);
+    QTest::newRow("0.5 from logarithmic to logarithmic") << qreal(0.5) << QAudio::LogarithmicVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.5);
+    QTest::newRow("1.0 from logarithmic to logarithmic") << qreal(1.0) << QAudio::LogarithmicVolumeScale << QAudio::LogarithmicVolumeScale << qreal(1.0);
+
+    QTest::newRow("-1.0 from logarithmic to decibel") << qreal(-1.0) << QAudio::LogarithmicVolumeScale << QAudio::DecibelVolumeScale << qreal(-200);
+    QTest::newRow("0.0 from logarithmic to decibel") << qreal(0.0) << QAudio::LogarithmicVolumeScale << QAudio::DecibelVolumeScale << qreal(-200);
+    QTest::newRow("0.33 from logarithmic to decibel") << qreal(0.33) << QAudio::LogarithmicVolumeScale << QAudio::DecibelVolumeScale << qreal(-21.21);
+    QTest::newRow("0.5 from logarithmic to decibel") << qreal(0.5) << QAudio::LogarithmicVolumeScale << QAudio::DecibelVolumeScale << qreal(-16.45);
+    QTest::newRow("0.72 from logarithmic to decibel") << qreal(0.72) << QAudio::LogarithmicVolumeScale << QAudio::DecibelVolumeScale << qreal(-11.17);
+    QTest::newRow("1.0 from logarithmic to decibel") << qreal(1.0) << QAudio::LogarithmicVolumeScale << QAudio::DecibelVolumeScale << qreal(0);
+
     QTest::newRow("-1000 from decibel to linear") << qreal(-1000.0) << QAudio::DecibelVolumeScale << QAudio::LinearVolumeScale << qreal(0.0);
     QTest::newRow("-200 from decibel to linear") << qreal(-200.0) << QAudio::DecibelVolumeScale << QAudio::LinearVolumeScale << qreal(0.0);
     QTest::newRow("-40 from decibel to linear") << qreal(-40.0) << QAudio::DecibelVolumeScale << QAudio::LinearVolumeScale << qreal(0.01);
@@ -192,6 +232,13 @@ void tst_QAudioNamespace::convertVolume_data()
     QTest::newRow("-5 from decibel to cubic") << qreal(-5.0) << QAudio::DecibelVolumeScale << QAudio::CubicVolumeScale << qreal(0.83);
     QTest::newRow("0 from decibel to cubic") << qreal(0.0) << QAudio::DecibelVolumeScale << QAudio::CubicVolumeScale << qreal(1.0);
 
+    QTest::newRow("-1000 from decibel to logarithmic") << qreal(-1000.0) << QAudio::DecibelVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.0);
+    QTest::newRow("-200 from decibel to logarithmic") << qreal(-200.0) << QAudio::DecibelVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.0);
+    QTest::newRow("-40 from decibel to logarithmic") << qreal(-40.0) << QAudio::DecibelVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.05);
+    QTest::newRow("-10 from decibel to logarithmic") << qreal(-10.0) << QAudio::DecibelVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.77);
+    QTest::newRow("-5 from decibel to logarithmic") << qreal(-5.0) << QAudio::DecibelVolumeScale << QAudio::LogarithmicVolumeScale << qreal(0.92);
+    QTest::newRow("0 from decibel to logarithmic") << qreal(0.0) << QAudio::DecibelVolumeScale << QAudio::LogarithmicVolumeScale << qreal(1.0);
+
     QTest::newRow("-1000 from decibel to decibel") << qreal(-1000.0) << QAudio::DecibelVolumeScale << QAudio::DecibelVolumeScale << qreal(-1000.0);
     QTest::newRow("-200 from decibel to decibel") << qreal(-200.0) << QAudio::DecibelVolumeScale << QAudio::DecibelVolumeScale << qreal(-200.0);
     QTest::newRow("-30 from decibel to decibel") << qreal(-30.0) << QAudio::DecibelVolumeScale << QAudio::DecibelVolumeScale << qreal(-30.0);
diff --git a/tests/auto/unit/qdeclarativemultimediaglobal/tst_qdeclarativemultimediaglobal.qml b/tests/auto/unit/qdeclarativemultimediaglobal/tst_qdeclarativemultimediaglobal.qml
index 22f4bf604..e44c68a29 100644
--- a/tests/auto/unit/qdeclarativemultimediaglobal/tst_qdeclarativemultimediaglobal.qml
+++ b/tests/auto/unit/qdeclarativemultimediaglobal/tst_qdeclarativemultimediaglobal.qml
@@ -77,6 +77,13 @@ TestCase {
             { tag: "0.72 from linear to cubic", input: 0.72, from: QtMultimedia.LinearVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 0.89 },
             { tag: "1.0 from linear to cubic", input: 1.0, from: QtMultimedia.LinearVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 1.0 },
 
+            { tag: "-1.0 from linear to logarithmic", input: -1, from: QtMultimedia.LinearVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0 },
+            { tag: "0.0 from linear to logarithmic", input: 0, from: QtMultimedia.LinearVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0 },
+            { tag: "0.33 from linear to logarithmic", input: 0.33, from: QtMultimedia.LinearVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0.78 },
+            { tag: "0.5 from linear to logarithmic", input: 0.5, from: QtMultimedia.LinearVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0.9 },
+            { tag: "0.72 from linear to logarithmic", input: 0.72, from: QtMultimedia.LinearVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0.96 },
+            { tag: "1.0 from linear to logarithmic", input: 1.0, from: QtMultimedia.LinearVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 1.0 },
+
             { tag: "-1.0 from linear to decibel", input: -1, from: QtMultimedia.LinearVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -200 },
             { tag: "0.0 from linear to decibel", input: 0, from: QtMultimedia.LinearVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -200 },
             { tag: "0.33 from linear to decibel", input: 0.33, from: QtMultimedia.LinearVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -9.63 },
@@ -96,6 +103,13 @@ TestCase {
             { tag: "0.5 from cubic to cubic", input: 0.5, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 0.5 },
             { tag: "1.0 from cubic to cubic", input: 1.0, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 1.0 },
 
+            { tag: "-1.0 from cubic to logarithmic", input: -1, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0 },
+            { tag: "0.0 from cubic to logarithmic", input: 0, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0 },
+            { tag: "0.33 from cubic to logarithmic", input: 0.33, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0.15 },
+            { tag: "0.5 from cubic to logarithmic", input: 0.5, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0.44 },
+            { tag: "0.72 from cubic to logarithmic", input: 0.72, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0.82 },
+            { tag: "1.0 from cubic to logarithmic", input: 1.0, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 1 },
+
             { tag: "-1.0 from cubic to decibel", input: -1, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -200 },
             { tag: "0.0 from cubic to decibel", input: 0, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -200 },
             { tag: "0.33 from cubic to decibel", input: 0.33, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -28.89 },
@@ -103,6 +117,32 @@ TestCase {
             { tag: "0.72 from cubic to decibel", input: 0.72, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -8.56 },
             { tag: "1.0 from cubic to decibel", input: 1.0, from: QtMultimedia.CubicVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: 0 },
 
+            { tag: "-1.0 from logarithmic to linear", input: -1, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.LinearVolumeScale, expectedOutput: 0 },
+            { tag: "0.0 from logarithmic to linear", input: 0, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.LinearVolumeScale, expectedOutput: 0 },
+            { tag: "0.33 from logarithmic to linear", input: 0.33, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.LinearVolumeScale, expectedOutput: 0.09 },
+            { tag: "0.5 from logarithmic to linear", input: 0.5, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.LinearVolumeScale, expectedOutput: 0.15 },
+            { tag: "0.72 from logarithmic to linear", input: 0.72, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.LinearVolumeScale, expectedOutput: 0.28 },
+            { tag: "1.0 from logarithmic to linear", input: 1.0, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.LinearVolumeScale, expectedOutput: 1.0 },
+
+            { tag: "-1.0 from logarithmic to cubic", input: -1, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 0 },
+            { tag: "0.0 from logarithmic to cubic", input: 0, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 0 },
+            { tag: "0.33 from logarithmic to cubic", input: 0.33, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 0.44 },
+            { tag: "0.5 from logarithmic to cubic", input: 0.5, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 0.53 },
+            { tag: "0.72 from logarithmic to cubic", input: 0.72, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 0.65 },
+            { tag: "1.0 from logarithmic to cubic", input: 1.0, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 1.0 },
+
+            { tag: "-1.0 from logarithmic to logarithmic", input: -1, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0 },
+            { tag: "0.0 from logarithmic to logarithmic", input: 0, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0 },
+            { tag: "0.5 from logarithmic to logarithmic", input: 0.5, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0.5 },
+            { tag: "1.0 from logarithmic to logarithmic", input: 1.0, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 1.0 },
+
+            { tag: "-1.0 from logarithmic to decibel", input: -1, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -200 },
+            { tag: "0.0 from logarithmic to decibel", input: 0, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -200 },
+            { tag: "0.33 from logarithmic to decibel", input: 0.33, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -21.21 },
+            { tag: "0.5 from logarithmic to decibel", input: 0.5, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -16.45 },
+            { tag: "0.72 from logarithmic to decibel", input: 0.72, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -11.17 },
+            { tag: "1.0 from logarithmic to decibel", input: 1.0, from: QtMultimedia.LogarithmicVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: 0 },
+
             { tag: "-1000 from decibel to linear", input: -1000, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.LinearVolumeScale, expectedOutput: 0 },
             { tag: "-200 from decibel to linear", input: -200, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.LinearVolumeScale, expectedOutput: 0 },
             { tag: "-40 from decibel to linear", input: -40, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.LinearVolumeScale, expectedOutput: 0.01 },
@@ -117,6 +157,13 @@ TestCase {
             { tag: "-5 from decibel to cubic", input: -5, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 0.83 },
             { tag: "0 from decibel to cubic", input: 0, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.CubicVolumeScale, expectedOutput: 1 },
 
+            { tag: "-1000 from decibel to logarithmic", input: -1000, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0 },
+            { tag: "-200 from decibel to logarithmic", input: -200, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0 },
+            { tag: "-40 from decibel to logarithmic", input: -40, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0.05 },
+            { tag: "-10 from decibel to logarithmic", input: -10, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0.77 },
+            { tag: "-5 from decibel to logarithmic", input: -5, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 0.92 },
+            { tag: "0 from decibel to logarithmic", input: 0, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.LogarithmicVolumeScale, expectedOutput: 1 },
+
             { tag: "-1000 from decibel to decibel", input: -1000, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -1000 },
             { tag: "-200 from decibel to decibel", input: -200, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -200 },
             { tag: "-30 from decibel to decibel", input: -30, from: QtMultimedia.DecibelVolumeScale, to: QtMultimedia.DecibelVolumeScale, expectedOutput: -30 },