/* Copyright (C) 2019
 * swift project Community / Contributors
 *
 * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
 * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
 * or distributed except according to the terms contained in the LICENSE file.
 */

//! \file

#ifndef BLACKSOUND_CODECS_OPUSENCODER_H
#define BLACKSOUND_CODECS_OPUSENCODER_H

#include "opus/opus.h"
#include "blacksound/blacksoundexport.h"

#include <QByteArray>
#include <QVector>

namespace BlackSound
{
    namespace Codecs
    {
        //! OPUS encoder
        class BLACKSOUND_EXPORT COpusEncoder
        {
        public:
            //! Ctor
            COpusEncoder(int sampleRate, int channels, int application = OPUS_APPLICATION_VOIP);

            //! Dtor
            ~COpusEncoder();

            //! Bit rate
            void setBitRate(int bitRate);

            //! \param frameCount Number of audio samples per frame
            //! \returns the size of an audio frame in bytes
            int frameByteCount(int frameCount);

            //! Frame count
            int frameCount(const QVector<qint16> pcmSamples);

            QByteArray encode(const QVector<qint16> pcmSamples, int samplesLength, int *encodedLength);

        private:
            OpusEncoder *opusEncoder = nullptr;
            int m_sampleRate;
            int m_channels;

            static constexpr int maxDataBytes = 4000;
        };
    } // ns
} // ns

#endif // guard