1 files changed, 72 insertions, 0 deletions
diff --git a/src/multimedia/darwin/qcoreaudioutils_p.h b/src/multimedia/darwin/qcoreaudioutils_p.h
new file mode 100644
index 000000000..94b6298f3
--- /dev/null
+++ b/src/multimedia/darwin/qcoreaudioutils_p.h
@@ -0,0 +1,72 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef IOSAUDIOUTILS_H
+#define IOSAUDIOUTILS_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <CoreAudio/CoreAudioTypes.h>
+
+#include <QtMultimedia/QAudioFormat>
+#include <QtCore/qglobal.h>
+
+QT_BEGIN_NAMESPACE
+
+class CoreAudioUtils
+{
+public:
+    static quint64 currentTime();
+    static double frequency();
+    static Q_MULTIMEDIA_EXPORT QAudioFormat toQAudioFormat(const AudioStreamBasicDescription& streamFormat);
+    static AudioStreamBasicDescription toAudioStreamBasicDescription(QAudioFormat const& audioFormat);
+
+    // ownership is transferred to caller, free with ::free()
+    static Q_MULTIMEDIA_EXPORT std::unique_ptr<AudioChannelLayout> toAudioChannelLayout(const QAudioFormat &format, UInt32 *size);
+    static QAudioFormat::ChannelConfig fromAudioChannelLayout(const AudioChannelLayout *layout);
+
+private:
+    static void initialize();
+    static double sFrequency;
+    static bool sIsInitialized;
+};
+
+class CoreAudioRingBuffer
+{
+public:
+    typedef QPair<char*, int> Region;
+
+    CoreAudioRingBuffer(int bufferSize);
+    ~CoreAudioRingBuffer();
+
+    Region acquireReadRegion(int size);
+    void releaseReadRegion(Region const& region);
+    Region acquireWriteRegion(int size);
+    void releaseWriteRegion(Region const& region);
+
+    int used() const;
+    int free() const;
+    int size() const;
+
+    void reset();
+
+private:
+    int     m_bufferSize;
+    int     m_readPos;
+    int     m_writePos;
+    char*   m_buffer;
+    QAtomicInt  m_bufferUsed;
+};
+
+QT_END_NAMESPACE
+
+#endif // IOSAUDIOUTILS_H