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#ifndef AUDIODEVICE_HPP__
#define AUDIODEVICE_HPP__
#include <QIODevice>
class QDataStream;
//
// abstract base class for audio devices
//
class AudioDevice : public QIODevice
{
public:
enum Channel {Mono, Left, Right, Both}; // these are mapped to combobox index so don't change
static char const * toString (Channel c)
{
switch (c)
{
case Mono: return "Mono";
case Left: return "Left";
case Right: return "Right";
default: return "Both";
}
}
static Channel fromString (QString const& str)
{
QString const s (str.toCaseFolded ().trimmed ().toLatin1 ());
if (s == "both") return Both;
else if (s == "right") return Right;
else if (s == "left") return Left;
else return Mono;
}
bool initialize (OpenMode mode, Channel channel);
bool isSequential () const override {return true;}
size_t bytesPerFrame () const {return sizeof (qint16) * (Mono == m_channel ? 1 : 2);}
Channel channel () const {return m_channel;}
protected:
explicit AudioDevice (QObject * parent = nullptr)
: QIODevice (parent)
{
}
void store (char const * source, size_t numFrames, qint16 * dest)
{
qint16 const * begin (reinterpret_cast<qint16 const *> (source));
for ( qint16 const * i = begin; i != begin + numFrames * (bytesPerFrame () / sizeof (qint16)); i += bytesPerFrame () / sizeof (qint16))
{
switch (m_channel)
{
case Mono:
*dest++ = *i;
break;
case Right:
*dest++ = *(i + 1);
break;
case Both: // should be able to happen but if it
// does we'll take left
Q_ASSERT (Both == m_channel);
[[fallthrough]];
case Left:
*dest++ = *i;
break;
}
}
}
qint16 * load (qint16 const sample, qint16 * dest)
{
switch (m_channel)
{
case Mono:
*dest++ = sample;
break;
case Left:
*dest++ = sample;
*dest++ = 0;
break;
case Right:
*dest++ = 0;
*dest++ = sample;
break;
case Both:
*dest++ = sample;
*dest++ = sample;
break;
}
return dest;
}
private:
Channel m_channel;
};
Q_DECLARE_METATYPE (AudioDevice::Channel);
#endif
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