1 files changed, 75 insertions, 0 deletions
diff --git a/src/multimedia/windows/qwindowsresampler_p.h b/src/multimedia/windows/qwindowsresampler_p.h
new file mode 100644
index 000000000..5885bffa6
--- /dev/null
+++ b/src/multimedia/windows/qwindowsresampler_p.h
@@ -0,0 +1,75 @@
+// Copyright (C) 2021 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 QT_QWINDOWSRESAMPLER_H
+#define QT_QWINDOWSRESAMPLER_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 <qbytearray.h>
+#include <qbytearrayview.h>
+#include <qaudioformat.h>
+#include <private/qcomptr_p.h>
+#include <private/qwindowsmediafoundation_p.h>
+#include <qt_windows.h>
+#include <mftransform.h>
+#include <QtCore/private/qfunctions_win_p.h>
+
+struct IMFSample;
+struct IMFTransform;
+
+QT_BEGIN_NAMESPACE
+
+class QWindowsMediaFoundation;
+
+class Q_MULTIMEDIA_EXPORT QWindowsResampler
+{
+public:
+    QWindowsResampler();
+    ~QWindowsResampler();
+
+    bool setup(const QAudioFormat &in, const QAudioFormat &out);
+
+    QByteArray resample(const QByteArrayView &in);
+    QByteArray resample(IMFSample *sample);
+
+    QAudioFormat inputFormat() const { return m_inputFormat; }
+    QAudioFormat outputFormat() const { return m_outputFormat; }
+
+    quint64 outputBufferSize(quint64 inputBufferSize) const;
+    quint64 inputBufferSize(quint64 outputBufferSize) const;
+
+    quint64 totalInputBytes() const { return m_totalInputBytes; }
+    quint64 totalOutputBytes() const { return m_totalOutputBytes; }
+
+private:
+    HRESULT processInput(const QByteArrayView &in);
+    HRESULT processOutput(QByteArray &out);
+
+    QComHelper m_comRuntime;
+    QWindowsMediaFoundation *m_wmf{ QWindowsMediaFoundation::instance() };
+    QMFRuntimeInit m_wmfRuntime{ m_wmf };
+    ComPtr<IMFTransform> m_resampler;
+
+    bool m_resamplerNeedsSampleBuffer = false;
+    quint64 m_totalInputBytes = 0;
+    quint64 m_totalOutputBytes = 0;
+    QAudioFormat m_inputFormat;
+    QAudioFormat m_outputFormat;
+
+    DWORD m_inputStreamID = 0;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_QWINDOWSRESAMPLER_H