Created base class for sample sources

audiodevice.cpp

@@ -0,0 +1,74 @@
+#include "audiodevice.h"
+
+// Qt includes
+#include <QIODevice>
+#include <QAudioInput>
+
+namespace {
+//! private helper to allow QAudioInput to write to a io device
+class AudioDeviceHelper : public QIODevice
+{
+public:
+    explicit AudioDeviceHelper(AudioDevice &audioDevice);
+
+    qint64 readData(char *data, qint64 maxlen) override;
+    qint64 writeData(const char *data, qint64 len) override;
+
+private:
+    AudioDevice &m_audioDevice;
+};
+}
+
+AudioDevice::AudioDevice(QObject *parent) :
+    BaseDevice{parent},
+    m_helper(std::make_unique<AudioDeviceHelper>(*this))
+{
+}
+
+AudioDevice::~AudioDevice() = default;
+
+void AudioDevice::start()
+{
+    QAudioFormat format;
+    format.setSampleRate(m_samplerate);
+    format.setChannelCount(2);
+    format.setSampleSize(16);
+    format.setSampleType(QAudioFormat::SignedInt);
+    format.setCodec("audio/pcm");
+    format.setByteOrder(QAudioFormat::LittleEndian);
+
+    m_input = std::make_unique<QAudioInput>(m_device, format);
+    m_input->start(m_helper.get());
+    m_input->setBufferSize(m_samplerate/m_framerate*sizeof(qint16)*2);
+}
+
+void AudioDevice::stop()
+{
+    m_input = nullptr;
+}
+
+
+
+namespace {
+AudioDeviceHelper::AudioDeviceHelper(AudioDevice &audioDevice) :
+    QIODevice(&audioDevice),
+    m_audioDevice(audioDevice)
+{
+    setOpenMode(QIODevice::WriteOnly);
+}
+
+qint64 AudioDeviceHelper::readData(char *data, qint64 maxlen)
+{
+    Q_UNUSED(data)
+    Q_UNUSED(maxlen)
+    qFatal("reading is not allowed!");
+}
+
+qint64 AudioDeviceHelper::writeData(const char *data, qint64 len)
+{
+    Q_ASSERT(len % sizeof(SamplePair) == 0);
+    emit m_audioDevice.samplesReceived(reinterpret_cast<const SamplePair*>(data),
+                                       reinterpret_cast<const SamplePair*>(data + (len/sizeof(SamplePair))));
+    return len;
+}
+}