Add a volume (gain) property to QAudioInput.

Only implemented for PulseAudio so far, but the API does explain that
it's optional.

Change-Id: I4543a1c81d810fe92bb08f1ed13f3a3534a371e4
Reviewed-by: Ling Hu <ling.hu@nokia.com>

2 files changed, 16 insertions, 0 deletions

diff --git a/examples/audioinput/audioinput.cpp b/examples/audioinput/audioinput.cpp
index d21b0cb02..045311cb3 100644
--- a/examples/audioinput/audioinput.cpp
+++ b/examples/audioinput/audioinput.cpp
@@ -235,6 +235,12 @@ void InputTest::initializeWindow()
     connect(m_deviceBox, SIGNAL(activated(int)), SLOT(deviceChanged(int)));
     layout->addWidget(m_deviceBox);
 
+    m_volumeSlider = new QSlider(Qt::Horizontal, this);
+    m_volumeSlider->setRange(0, 100);
+    m_volumeSlider->setValue(100);
+    connect(m_volumeSlider, SIGNAL(valueChanged(int)), SLOT(sliderChanged(int)));
+    layout->addWidget(m_volumeSlider);
+
     m_modeButton = new QPushButton(this);
     m_modeButton->setText(PushModeLabel);
     connect(m_modeButton, SIGNAL(clicked()), SLOT(toggleMode()));
@@ -281,6 +287,7 @@ void InputTest::createAudioInput()
     m_audioInput = new QAudioInput(m_device, m_format, this);
     connect(m_audioInput, SIGNAL(notify()), SLOT(notified()));
     connect(m_audioInput, SIGNAL(stateChanged(QAudio::State)), SLOT(stateChanged(QAudio::State)));
+    m_volumeSlider->setValue(m_audioInput->volume() * 100);
     m_audioInfo->start();
     m_audioInput->start(m_audioInfo);
 }
@@ -364,3 +371,9 @@ void InputTest::deviceChanged(int index)
     m_device = m_deviceBox->itemData(index).value<QAudioDeviceInfo>();
     createAudioInput();
 }
+
+void InputTest::sliderChanged(int value)
+{
+    if (m_audioInput)
+        m_audioInput->setVolume(qreal(value) / 100);
+}
diff --git a/examples/audioinput/audioinput.h b/examples/audioinput/audioinput.h
index b14681361..1ef8e6533 100644
--- a/examples/audioinput/audioinput.h
+++ b/examples/audioinput/audioinput.h
@@ -48,6 +48,7 @@
 #include <QPushButton>
 #include <QComboBox>
 #include <QByteArray>
+#include <QSlider>
 
 #include <qaudioinput.h>
 
@@ -113,6 +114,7 @@ private slots:
     void toggleSuspend();
     void stateChanged(QAudio::State state);
     void deviceChanged(int index);
+    void sliderChanged(int value);
 
 private:
     // Owned by layout
@@ -120,6 +122,7 @@ private:
     QPushButton *m_modeButton;
     QPushButton *m_suspendResumeButton;
     QComboBox *m_deviceBox;
+    QSlider *m_volumeSlider;
 
     QAudioDeviceInfo m_device;
     AudioInfo *m_audioInfo;