qffmpegresampler_p.h

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// Copyright (C) 2022 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 QFFMPEGRESAMPLER_P_H

#define QFFMPEGRESAMPLER_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 "qaudiobuffer.h"

#include <QtFFmpegMediaPluginImpl/private/qffmpeg_p.h>

#include <QtMultimedia/private/qplatformaudioresampler_p.h>

QT_BEGIN_NAMESPACE

namespace QFFmpeg

class CodecContext;

} // namespace QFFmpeg

class QFFmpegResampler : public QPlatformAudioResampler

    QFFmpegResampler(const QAudioFormat &inputFormat, const QAudioFormat &outputFormat,

                     qint64 startTime);

    QFFmpegResampler(const QFFmpeg::CodecContext *codecContext, const QAudioFormat &outputFormat,

                     qint64 startTime);

    template <typename... Args>

    static std::unique_ptr<QFFmpegResampler> createImpl(Args...);

public:

    static std::unique_ptr<QFFmpegResampler> createFromInputFormat(const QAudioFormat &input,

                                                                   const QAudioFormat &output,

                                                                   qint64 startTime = 0);

    static std::unique_ptr<QFFmpegResampler> createFromCodecContext(const QFFmpeg::CodecContext *,

                                                                    const QAudioFormat &output,

                                                                    qint64 startTime = 0);

    ~QFFmpegResampler() override;

    bool isInitialized() const;

    QAudioBuffer resample(const char *data, size_t size) override;

    QAudioBuffer resample(const AVFrame *frame);

    qint64 samplesProcessed() const { return m_samplesProcessed; }

    void setSampleCompensation(qint32 delta, quint32 distance);

    qint32 activeSampleCompensationDelta() const;

private:

    int adjustMaxOutSamples(int inputSamplesCount);

    QAudioBuffer resample(const uint8_t **inputData, int inputSamplesCount);

private:

    QAudioFormat m_inputFormat;

    QAudioFormat m_outputFormat;

    qint64 m_startTime = 0;

    QFFmpeg::SwrContextUPtr m_resampler;

    qint64 m_samplesProcessed = 0;

    qint64 m_endCompensationSample = std::numeric_limits<qint64>::min();

    qint32 m_sampleCompensationDelta = 0;

};

QT_END_NAMESPACE

#endif