Implement volume in audiocapture plugin.

This plugin uses QAudioInput as audio source for the recording, just
forward the volume to it.

Change-Id: Ice3ec5e48195b13d5f738b79a357dfc261ad8955
Reviewed-by: Christian Stromme <christian.stromme@theqtcompany.com>

src/plugins/audiocapture/audiocapturesession.cpp

@@ -88,6 +88,8 @@ AudioCaptureSession::AudioCaptureSession(QObject *parent)
     , m_audioInput(0)
     , m_deviceInfo(QAudioDeviceInfo::defaultInputDevice())
     , m_wavFile(true)
+    , m_volume(1.0)
+    , m_muted(false)
 {
     m_format = m_deviceInfo.preferredFormat();
 }
@@ -312,6 +314,8 @@ void AudioCaptureSession::record()
                 file.write((char*)&header,sizeof(CombinedHeader));
             }
 
+            setVolumeHelper(m_muted ? 0 : m_volume);
+
             file.startProbes(m_format);
             m_audioInput->start(qobject_cast<QIODevice*>(&file));
         } else {
@@ -400,4 +404,51 @@ void AudioCaptureSession::setCaptureDevice(const QString &deviceName)
     m_deviceInfo = QAudioDeviceInfo::defaultInputDevice();
 }
 
+qreal AudioCaptureSession::volume() const
+{
+    return m_volume;
+}
+
+bool AudioCaptureSession::isMuted() const
+{
+    return m_muted;
+}
+
+void AudioCaptureSession::setVolume(qreal v)
+{
+    qreal boundedVolume = qBound(qreal(0), v, qreal(1));
+
+    if (m_volume == boundedVolume)
+        return;
+
+    m_volume = boundedVolume;
+
+    if (!m_muted)
+        setVolumeHelper(m_volume);
+
+    emit volumeChanged(m_volume);
+}
+
+void AudioCaptureSession::setMuted(bool muted)
+{
+    if (m_muted == muted)
+        return;
+
+    m_muted = muted;
+
+    setVolumeHelper(m_muted ? 0 : m_volume);
+
+    emit mutedChanged(m_muted);
+}
+
+void AudioCaptureSession::setVolumeHelper(qreal volume)
+{
+    if (!m_audioInput)
+        return;
+
+    m_audioInput->setVolume(volume);
+}
+
+
+
 QT_END_NAMESPACE

src/plugins/audiocapture/audiocapturesession.h

@@ -96,11 +96,19 @@ public:
 
     void setCaptureDevice(const QString &deviceName);
 
+    void setVolume(qreal v);
+    qreal volume() const;
+
+    void setMuted(bool muted);
+    bool isMuted() const;
+
 signals:
     void stateChanged(QMediaRecorder::State state);
     void statusChanged(QMediaRecorder::Status status);
     void positionChanged(qint64 position);
     void actualLocationChanged(const QUrl &location);
+    void volumeChanged(qreal volume);
+    void mutedChanged(bool muted);
     void error(int error, const QString &errorString);
 
 private slots:
@@ -114,6 +122,8 @@ private:
 
     void setStatus(QMediaRecorder::Status status);
 
+    void setVolumeHelper(qreal volume);
+
     QDir defaultDir() const;
     QString generateFileName(const QString &requestedName,
                              const QString &extension) const;
@@ -129,6 +139,8 @@ private:
     QAudioDeviceInfo m_deviceInfo;
     QAudioFormat m_format;
     bool m_wavFile;
+    qreal m_volume;
+    bool m_muted;
 
     // WAV header stuff
 

src/plugins/audiocapture/audiomediarecordercontrol.cpp

@@ -50,6 +50,10 @@ AudioMediaRecorderControl::AudioMediaRecorderControl(QObject *parent)
             this, SIGNAL(statusChanged(QMediaRecorder::Status)));
     connect(m_session, SIGNAL(actualLocationChanged(QUrl)),
             this, SIGNAL(actualLocationChanged(QUrl)));
+    connect(m_session, &AudioCaptureSession::volumeChanged,
+            this, &AudioMediaRecorderControl::volumeChanged);
+    connect(m_session, &AudioCaptureSession::mutedChanged,
+            this, &AudioMediaRecorderControl::mutedChanged);
     connect(m_session, SIGNAL(error(int,QString)),
             this, SIGNAL(error(int,QString)));
 }
@@ -85,13 +89,12 @@ qint64 AudioMediaRecorderControl::duration() const
 
 bool AudioMediaRecorderControl::isMuted() const
 {
-    return false;
+    return m_session->isMuted();
 }
 
 qreal AudioMediaRecorderControl::volume() const
 {
-    //TODO: implement muting and audio gain
+    return m_session->volume();
-    return 1.0;
 }
 
 void AudioMediaRecorderControl::setState(QMediaRecorder::State state)
@@ -101,14 +104,12 @@ void AudioMediaRecorderControl::setState(QMediaRecorder::State state)
 
 void AudioMediaRecorderControl::setMuted(bool muted)
 {
-    if (muted)
+    m_session->setMuted(muted);
-        qWarning("Muting the audio recording is not supported.");
 }
 
 void AudioMediaRecorderControl::setVolume(qreal volume)
 {
-    if (!qFuzzyCompare(volume, qreal(1.0)))
+    m_session->setVolume(volume);
-        qWarning("Changing the audio recording volume is not supported.");
 }
 
 QT_END_NAMESPACE