zork_raw.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 ZVISION_ZORK_RAW_H
#define ZVISION_ZORK_RAW_H
 
#include "audio/audiostream.h"
 
namespace Common {
class SeekableReadStream;
}
 
namespace ZVision {
 
class ZVision;
 
struct SoundParams {
    char identifier;
    uint32 rate;
    bool stereo;
    bool packed;
    bool bits16;
};
 
class RawChunkStream {
public:
    RawChunkStream(bool stereo);
 
    ~RawChunkStream() {
    }
private:
    uint _stereo;
 
    struct {
        int32 sample;
        int16 index;
    } _lastSample[2];
 
    static const int16 _stepAdjustmentTable[8];
    static const int32 _amplitudeLookupTable[89];
 
public:
 
    struct RawChunk {
        int16 *data;
        uint32 size;
    };
 
    void init();
    //Read next audio portion in new stream (needed for avi), return structure with buffer
    RawChunk readNextChunk(Common::SeekableReadStream *stream);
    //Read numSamples from stream to buffer
    int readBuffer(int16 *buffer, Common::SeekableReadStream *stream, const int numSamples);
};
 
class RawZorkStream : public Audio::RewindableAudioStream {
public:
    RawZorkStream(uint32 rate, bool stereo, DisposeAfterUse::Flag disposeStream, Common::SeekableReadStream *stream);
 
    ~RawZorkStream() override {
    }
 
public:
    static const SoundParams _zNemSoundParamLookupTable[32];
    static const SoundParams _zgiSoundParamLookupTable[24];
 
private:
    const int _rate;                                           // Sample rate of stream
    Audio::Timestamp _playtime;                                // Calculated total play time
    Common::DisposablePtr<Common::SeekableReadStream> _stream; // Stream to read data from
    bool _endOfData;                                           // Whether the stream end has been reached
    uint _stereo;
 
    RawChunkStream _streamReader;
 
public:
    int readBuffer(int16 *buffer, const int numSamples) override;
 
    bool isStereo() const override {
        return _stereo;
    }
    bool endOfData() const override {
        return _endOfData;
    }
 
    int getRate() const override {
        return _rate;
    }
    Audio::Timestamp getLength() const {
        return _playtime;
    }
 
    bool rewind() override;
};
 
Audio::RewindableAudioStream *makeRawZorkStream(Common::SeekableReadStream *stream,
        int rate,
        bool stereo,
        DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);
 
Audio::RewindableAudioStream *makeRawZorkStream(const Common::Path &filePath, ZVision *engine);
 
} // End of namespace ZVision
 
#endif