Initial Commit

.svn/pristine/ef/ef6b832da64a4b93455ec8746df4232e90ce4ccb.svn-base

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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)
+  {
+    return Mono == c ? "Mono" : Left == c ? "Left" : Right == c ? "Right" : "Both";
+  }
+
+  static Channel fromString (QString const& str)
+  {
+    QString s (str.toCaseFolded ().trimmed ().toLatin1 ());
+    return "both" == s ? Both : "right" == s ? Right : "left" == s ? Left : 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:
+  AudioDevice (QObject * parent = 0)
+    : 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);
+	  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