smk_decoder.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/>.
 *
 *
 * This file is dual-licensed.
 * In addition to the GPLv3 license mentioned above, MojoTouch has
 * non-exclusively licensed this code on March 23th, 2024, to be used in
 * closed-source products.
 * Therefore, any contributions (commits) to it will also be dual-licensed.
 *
 */

#ifndef VIDEO_SMK_PLAYER_H
#define VIDEO_SMK_PLAYER_H

#include "common/bitarray.h"
#include "common/bitstream.h"
#include "common/rational.h"
#include "common/rect.h"
#include "graphics/pixelformat.h"
#include "graphics/surface.h"
#include "video/video_decoder.h"
#include "audio/mixer.h"

namespace Audio {
class QueuingAudioStream;
}

namespace Common {
class SeekableReadStream;
}

namespace Video {

class BigHuffmanTree;

// Because the maximum number of bits read from a bitstream is 16, and the data is 8-bit, the container only
// needs to hold up to 23 bits at any given time. As such, we use a bitstream with a 32-bit container to
// avoid the overhead of 64-bit maths on systems that don't support it natively.
typedef Common::BitStreamImpl<Common::BitStreamMemoryStream, uint32, 8, false, false> SmackerBitStream;

class SmackerDecoder : public VideoDecoder {
public:
    SmackerDecoder();
    virtual ~SmackerDecoder();

    virtual bool loadStream(Common::SeekableReadStream *stream);
    void close();
    void forceSeekToFrame(uint frame);
    bool rewind();

    Common::Rational getFrameRate() const;

    virtual const Common::Rect *getNextDirtyRect();

protected:
    void readNextPacket();
    bool supportsAudioTrackSwitching() const { return true; }
    AudioTrack *getAudioTrack(int index);

    virtual void handleAudioTrack(byte track, uint32 chunkSize, uint32 unpackedSize);

    virtual uint32 getSignatureVersion(uint32 signature) const;

    class SmackerVideoTrack : public FixedRateVideoTrack {
    public:
        SmackerVideoTrack(uint32 width, uint32 height, uint32 frameCount, const Common::Rational &frameRate, uint32 flags, uint32 version);
        ~SmackerVideoTrack();

        bool isRewindable() const { return true; }
        bool rewind() { _curFrame = -1; return true; }

        uint16 getWidth() const;
        uint16 getHeight() const;
        Graphics::PixelFormat getPixelFormat() const;
        int getCurFrame() const { return _curFrame; }
        int getFrameCount() const { return _frameCount; }
        const Graphics::Surface *decodeNextFrame() { return _surface; }
        const byte *getPalette() const { _dirtyPalette = false; return _palette; }
        bool hasDirtyPalette() const { return _dirtyPalette; }

        void readTrees(SmackerBitStream &bs, uint32 mMapSize, uint32 mClrSize, uint32 fullSize, uint32 typeSize);
        void increaseCurFrame() { _curFrame++; }
        void decodeFrame(SmackerBitStream &bs);
        void unpackPalette(Common::SeekableReadStream *stream);

        Common::Rational getFrameRate() const { return _frameRate; }

        const Common::Rect *getNextDirtyRect();

    protected:
        Graphics::Surface *_surface;

    private:
        Common::Rational _frameRate;
        uint32 _flags, _version;

        byte _palette[3 * 256];
        mutable bool _dirtyPalette;

        int _curFrame;
        uint32 _frameCount;

        BigHuffmanTree *_MMapTree;
        BigHuffmanTree *_MClrTree;
        BigHuffmanTree *_FullTree;
        BigHuffmanTree *_TypeTree;

        Common::BitArray _dirtyBlocks;
        Common::Rect _lastDirtyRect;

        // Possible runs of blocks
        static uint getBlockRun(int index) { return (index <= 58) ? index + 1 : 128 << (index - 59); }
    };

    virtual SmackerVideoTrack *createVideoTrack(uint32 width, uint32 height, uint32 frameCount, const Common::Rational &frameRate, uint32 flags, uint32 version) const;

    Common::SeekableReadStream *_fileStream;

    enum AudioCompression {
        kCompressionNone,
        kCompressionDPCM,
        kCompressionRDFT,
        kCompressionDCT
    };

    struct AudioInfo {
        AudioCompression compression;
        bool hasAudio;
        bool is16Bits;
        bool isStereo;
        uint32 sampleRate;
    };

    struct {
        uint32 signature;
        uint32 flags;
        uint32 audioSize[7];
        uint32 treesSize;
        uint32 mMapSize;
        uint32 mClrSize;
        uint32 fullSize;
        uint32 typeSize;
        AudioInfo audioInfo[7];
        uint32 dummy;
    } _header;

    uint32 *_frameSizes;

private:

    class SmackerAudioTrack : public AudioTrack {
    public:
        SmackerAudioTrack(const AudioInfo &audioInfo, Audio::Mixer::SoundType soundType);
        ~SmackerAudioTrack();

        bool isRewindable() const { return true; }
        bool rewind();

        void queueCompressedBuffer(byte *buffer, uint32 bufferSize, uint32 unpackedSize);
        void queuePCM(byte *buffer, uint32 bufferSize);

    protected:
        Audio::AudioStream *getAudioStream() const;

    private:
        Audio::QueuingAudioStream *_audioStream;
        AudioInfo _audioInfo;
    };

    class SmackerEmptyTrack : public Track {
        VideoDecoder::Track::TrackType getTrackType() const { return VideoDecoder::Track::kTrackTypeNone; }

        bool endOfTrack() const { return true; }

        bool isSeekable() const { return true; }
        bool seek(const Audio::Timestamp &time) { return true; }
    };

protected:
    // The FrameTypes section of a Smacker file contains an array of bytes, where
    // the 8 bits of each byte describe the contents of the corresponding frame.
    // The highest 7 bits correspond to audio frames (bit 7 is track 6, bit 6 track 5
    // and so on), so there can be up to 7 different audio tracks. When the lowest bit
    // (bit 0) is set, it denotes a frame that contains a palette record
    byte *_frameTypes;

private:
    uint32 _firstFrameStart;
};

} // End of namespace Video

#endif