Audio output device: added volume control

sdrbase/audio/audiooutputdevice.cpp

@@ -33,6 +33,7 @@ AudioOutputDevice::AudioOutputDevice() :
 	m_udpChannelCodec(UDPCodecL16),
 	m_audioUsageCount(0),
 	m_onExit(false),
+	m_volume(1.0),
 	m_audioFifos()
 {
 }
@@ -114,6 +115,7 @@ bool AudioOutputDevice::start(int device, int rate)
 
         m_audioOutput = new QAudioOutput(devInfo, m_audioFormat);
         m_audioNetSink = new AudioNetSink(0, m_audioFormat.sampleRate(), false);
+		m_audioOutput->setVolume(m_volume);
 
         QIODevice::open(QIODevice::ReadOnly);
 
@@ -341,3 +343,12 @@ qint64 AudioOutputDevice::writeData(const char* data, qint64 len)
 	Q_UNUSED(len);
 	return 0;
 }
+
+void AudioOutputDevice::setVolume(float volume)
+{
+    m_volume = volume;
+
+    if (m_audioOutput) {
+        m_audioOutput->setVolume(m_volume);
+	}
+}

sdrbase/audio/audiooutputdevice.h

@@ -71,6 +71,7 @@ public:
 	void setUdpChannelMode(UDPChannelMode udpChannelMode);
 	void setUdpChannelFormat(UDPChannelCodec udpChannelCodec, bool stereo, int sampleRate);
 	void setUdpDecimation(uint32_t decimation);
+	void setVolume(float volume);
 
 private:
 	QMutex m_mutex;
@@ -81,6 +82,7 @@ private:
 	UDPChannelCodec m_udpChannelCodec;
 	uint m_audioUsageCount;
 	bool m_onExit;
+	float m_volume;
 
 	std::list<AudioFifo*> m_audioFifos;
 	std::vector<qint32> m_mixBuffer;