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// Copyright (C) 2024 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 QAUDIOFORMAT_P_H
#define QAUDIOFORMAT_P_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 <QtMultimedia/qaudioformat.h>
#include <QtMultimedia/qtmultimediaglobal.h>
#include <QtMultimedia/private/qmultimedia_ranges_p.h>
#include <array>
QT_BEGIN_NAMESPACE
namespace QtMultimediaPrivate {
inline constexpr std::array allSupportedSampleRates{
8'000, 11'025, 12'000, 16'000, 22'050, 24'000, 32'000, 44'100,
48'000, 64'000, 88'200, 96'000, 128'000, 176'400, 192'000,
};
inline constexpr std::array allSupportedSampleFormats{
QAudioFormat::UInt8,
QAudioFormat::Int16,
QAudioFormat::Int32,
QAudioFormat::Float,
};
template <typename T>
int findClosestSamplingRate(int rate, QSpan<const T> supportedRates)
{
Q_ASSERT(!supportedRates.empty());
namespace ranges = QtMultimediaPrivate::ranges;
auto exactMatchIt = ranges::find(supportedRates, T(rate));
if (exactMatchIt != supportedRates.end())
return int(*exactMatchIt);
// find supported rate, which is closest to the default pipewire sampling rate (using a
// logarithmic scaling)
auto ratioToRate = [&](int arg) {
return arg > rate ? float(arg) / rate : rate / float(arg);
};
return ranges::min(supportedRates, [&](auto lhs, auto rhs) {
return ratioToRate(lhs) < ratioToRate(rhs);
});
}
} // namespace QtMultimediaPrivate
QT_END_NAMESPACE
#endif // QAUDIOFORMAT_P_H