video.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 NANCY_VIDEO_H
#define NANCY_VIDEO_H
 
#include "video/video_decoder.h"
 
namespace Common {
class ReadStream;
class SeekableReadStream;
}
 
namespace Graphics {
struct Surface;
}
 
namespace Nancy {
 
class Decompressor;
class VideoCacheLoader;
 
class AVFDecoder : public Video::VideoDecoder {
    friend class VideoCacheLoader;
public:
    enum CacheHint { kLoadForward, kLoadBidirectional };
 
    AVFDecoder(CacheHint cacheHint = kLoadForward) : _cacheHint(cacheHint) {}
    virtual ~AVFDecoder();
 
    bool loadStream(Common::SeekableReadStream *stream) override;
    const Graphics::Surface *decodeFrame(uint frameNr);
    void addFrameTime(const uint16 timeToAdd);
    bool atEnd() const;
 
private:
    CacheHint _cacheHint;
    class AVFVideoTrack : public FixedRateVideoTrack {
    public:
        AVFVideoTrack(Common::SeekableReadStream *stream, uint32 chunkFileFormat, CacheHint cacheHint);
        virtual ~AVFVideoTrack();
 
        uint16 getWidth() const override { return _width; }
        uint16 getHeight() const override { return _height; }
        Graphics::PixelFormat getPixelFormat() const override { return _pixelFormat; }
        int getCurFrame() const override { return _curFrame; }
        int getFrameCount() const override { return _frameCount; }
        bool isSeekable() const override { return true; }
        bool seek(const Audio::Timestamp &time) override;
        bool setReverse(bool reverse) override;
        bool isReversed() const override { return _reversed; }
        bool endOfTrack() const override;
        const Graphics::Surface *decodeNextFrame() override;
        const Graphics::Surface *decodeFrame(uint frameNr);
        const Graphics::Surface *getSurfaceForFrame(uint frameNr) { return &_frameCache[frameNr]; }
        void addFrameTime(const uint16 timeToAdd) { _frameTime += timeToAdd; }
        CacheHint getCacheHint() const { return _cacheHint; }
 
    protected:
        Common::Rational getFrameRate() const override { return Common::Rational(1000, _frameTime); }
 
    private:
        struct ChunkInfo {
            Common::String name;
            uint16 index;
            uint32 offset;
            uint32 compressedSize;
            uint32 size;
            byte type;
        };
 
        bool decode(byte *outBuf, uint32 frameSize, Common::ReadStream &inBuf) const;
 
        Common::SeekableReadStream *_fileStream;
        Graphics::PixelFormat _pixelFormat;
        uint _width, _height, _depth, _frameSize;
        int _curFrame;
        uint _frameCount;
        uint32 _frameTime;
        Common::Array<ChunkInfo> _chunkInfo;
        Decompressor *_dec;
        bool _reversed;
        bool _compressed;
 
        Common::SharedPtr<VideoCacheLoader> _loaderPtr;
        Common::Array<Graphics::Surface> _frameCache;
        CacheHint _cacheHint;
    };
};
 
} // End of namespace Nancy
 
#endif // NANCY_VIDEO_H