adpcm.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef TINSEL_ADPCM_H
#define TINSEL_ADPCM_H

#include "audio/decoders/adpcm_intern.h"

namespace Tinsel {

class Tinsel_ADPCMStream : public Audio::ADPCMStream {
protected:
    struct {
        // Tinsel
        double predictor;
        double K0, K1;
        double d0, d1;
    } _status;

    void reset() override {
        ADPCMStream::reset();
        memset(&_status, 0, sizeof(_status));
    }

    int16 decodeTinsel(int16, double);
    void readBufferTinselHeader();

public:
    Tinsel_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
        : ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {

        if (blockAlign == 0)
            error("Tinsel_ADPCMStream(): blockAlign isn't specified");

        if (channels != 1)
            error("Tinsel_ADPCMStream(): Tinsel ADPCM only supports mono");

        memset(&_status, 0, sizeof(_status));
    }

};

class Tinsel4_ADPCMStream : public Tinsel_ADPCMStream {
public:
    Tinsel4_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
        : Tinsel_ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {}

    int readBuffer(int16 *buffer, const int numSamples) override;
};

class Tinsel6_ADPCMStream : public Tinsel_ADPCMStream {
protected:
    uint8 _chunkPos;
    uint16 _chunkData;

    void reset() override {
        ADPCMStream::reset();
        _chunkPos = 0;
        _chunkData = 0;
    }

public:
    Tinsel6_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
        : Tinsel_ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {
        _chunkPos = 0;
        _chunkData = 0;
    }

    int readBuffer(int16 *buffer, const int numSamples) override;
};

class Tinsel8_ADPCMStream : public Tinsel_ADPCMStream {
public:
    Tinsel8_ADPCMStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse, uint32 size, int rate, int channels, uint32 blockAlign)
        : Tinsel_ADPCMStream(stream, disposeAfterUse, size, rate, channels, blockAlign) {}

    int readBuffer(int16 *buffer, const int numSamples) override;
};


} // End of namespace Tinsel

#endif