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qwindowsresampler_p.h
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1// Copyright (C) 2021 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4
5#ifndef QT_QWINDOWSRESAMPLER_H
6#define QT_QWINDOWSRESAMPLER_H
7
8//
9// W A R N I N G
10// -------------
11//
12// This file is not part of the Qt API. It exists purely as an
13// implementation detail. This header file may change from version to
14// version without notice, or even be removed.
15//
16// We mean it.
17//
18
19#include <QtCore/qbytearray.h>
20#include <QtCore/qbytearrayview.h>
21#include <QtCore/private/qcomptr_p.h>
22#include <QtCore/private/qexpected_p.h>
23#include <QtMultimedia/qaudioformat.h>
24#include <QtMultimedia/private/qcominitializer_p.h>
25#include <QtMultimedia/private/qplatformaudioresampler_p.h>
26#include <QtMultimedia/private/qwindowsmediafoundation_p.h>
27
28#include <mftransform.h>
29
30#include <memory_resource>
31
32struct IMFSample;
33struct IMFTransform;
34
35QT_BEGIN_NAMESPACE
36
37class QWindowsMediaFoundation;
38
39class Q_MULTIMEDIA_EXPORT QWindowsResampler : public QPlatformAudioResampler
40{
41public:
42 static bool isAvailable();
43
44 QWindowsResampler();
45 ~QWindowsResampler();
46
47 bool setup(const QAudioFormat &in, const QAudioFormat &out);
48 void setStartTimeOffset(std::chrono::microseconds); // for QPlatformAudioResampler
49
50 QByteArray resample(QByteArray);
51 QByteArray resample(const QByteArrayView &);
52 QByteArray resample(const ComPtr<IMFSample> &);
53
54 QAudioBuffer resample(const char *data, size_t size) override;
55
56 // Caveat: the memory resource needs outlive the QWindowsResampler instance (the IMFTransform
57 // API does not rule out that the input buffers are kept alive)
58 std::pmr::vector<std::byte> resample(QSpan<const std::byte>, std::pmr::memory_resource *);
59
60 QAudioFormat inputFormat() const { return m_inputFormat; }
61 QAudioFormat outputFormat() const { return m_outputFormat; }
62
63 quint64 outputBufferSize(quint64 inputBufferSize) const;
64 quint64 inputBufferSize(quint64 outputBufferSize) const;
65
66 quint64 totalInputBytes() const { return m_totalInputBytes; }
67 quint64 totalOutputBytes() const { return m_totalOutputBytes; }
68
69private:
70 qsizetype overAllocatedOutputBufferSize();
71 template <typename Functor>
72 auto processOutput(ComPtr<IMFMediaBuffer> buffer, Functor &&f)
73 -> std::invoke_result_t<Functor, const ComPtr<IMFMediaBuffer> &>;
74
75 q23::expected<QByteArray, HRESULT> processOutput();
76
77 QComInitializer m_comInitializer;
78 QWindowsMediaFoundation *m_wmf{ QWindowsMediaFoundation::instance() };
79 QMFRuntimeInit m_wmfRuntime{ m_wmf };
80 ComPtr<IMFTransform> m_resampler;
81 ComPtr<IMFSample> m_inputSample;
82 ComPtr<IMFSample> m_outputSample;
83
84 quint64 m_totalInputBytes = 0;
85 quint64 m_totalOutputBytes = 0;
86 QAudioFormat m_inputFormat;
87 QAudioFormat m_outputFormat;
88
89 DWORD m_inputStreamID = 0;
90
91 std::chrono::microseconds m_startTimeOffset;
92};
93
94QT_END_NAMESPACE
95
96#endif // QT_QWINDOWSRESAMPLER_H