Fix adjusting volume for default device

Using WAVE_MAPPER device id (which points to default device)
is not possible to get and initialize a mixer object to set volume.

Function mixerGetID() does not support WAVE_MAPPER as a device id yet.

Since we do not know device number anymore
needs to call waveInOpen() first and after that
initialize mixer controls using hWaveIn handler.

- Fixed default volume from 0.0f -> 1.0f.
- Before QWindowsAudioInput::start() is called, use cached volume.
- After QWindowsAudioInput::start(), mixer controls are initialized.
- QWindowsAudioInput::stop() deinitializes mixer controls.

Task-number: QTBUG-61920
Change-Id: I5a94dad282618fb4a2e0f75c34008ca002bd1aeb
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/auto/integration/qaudioinput/tst_qaudioinput.cpp b/tests/auto/integration/qaudioinput/tst_qaudioinput.cpp
index 14023f229..64e872f27 100644
--- a/tests/auto/integration/qaudioinput/tst_qaudioinput.cpp
+++ b/tests/auto/integration/qaudioinput/tst_qaudioinput.cpp
@@ -887,6 +887,12 @@ void tst_QAudioInput::volume()
     QTest::qWait(500);
     QTRY_VERIFY(qRound(audioInput.volume()*10.0f) == 10);
 
+    audioInput.setVolume(half);
+    audioInput.start();
+    QTRY_VERIFY(qRound(audioInput.volume()*10.0f) == 5);
+    audioInput.setVolume(one);
+    QTRY_VERIFY(qRound(audioInput.volume()*10.0f) == 10);
+
     audioInput.setVolume(volume);
 }