1 files changed, 49 insertions, 0 deletions
diff --git a/OutputBuffer.h b/OutputBuffer.h
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+++ b/OutputBuffer.h
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+/*
+ * Copyright (C) 2017 Konsulko Group
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/*
+ * Simple buffer device to act as input device for QAudioInput.
+ *
+ * It basically wraps QByteArray with some additional locking that
+ * the QBuffer class does not provide.  It also ensures that reads
+ * return in units of the given format's sample size.  This is
+ * required to handle the RTL-SDR library output sometimes arriving
+ * with half a sample at the end.  QAudioOutput will blindly pass
+ * that half sample along and trigger a PulseAudio error if we do
+ * not handle it here.
+ */
+
+#ifndef OUTPUTBUFFER_H
+#define OUTPUTBUFFER_H
+
+#include <QtCore/QIODevice>
+#include <QtCore/QMutex>
+#include <QtMultimedia/QAudioFormat>
+
+class OutputBuffer : public QIODevice
+{
+    Q_OBJECT
+
+public:
+    OutputBuffer(const QAudioFormat &format, QObject *parent);
+    ~OutputBuffer();
+
+    void start();
+    void stop();
+
+    qint64 readData(char *data, qint64 maxlen);
+    qint64 writeData(const char *data, qint64 len);
+    qint64 bytesAvailable();
+
+private:
+    QMutex m_mutex;
+    QByteArray m_buffer;
+    unsigned int m_sample_size;
+};
+
+#endif // OUTPUTBUFFER_H