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