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https://github.com/libretro/scummvm.git
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88ba96aa3c
A regression from 7f61a09478. The current frame is the currently
displayed frame, not the frame that should be displayed next. Thanks to
clone2727 and Marisa-Chan for the explanation and fixes
135 lines
4.0 KiB
C++
135 lines
4.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef ZVISION_RLF_DECODER_H
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#define ZVISION_RLF_DECODER_H
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#include "common/file.h"
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#include "video/video_decoder.h"
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#include "graphics/surface.h"
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namespace ZVision {
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class RLFDecoder : public Video::VideoDecoder {
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public:
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RLFDecoder() {}
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~RLFDecoder();
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bool loadStream(Common::SeekableReadStream *stream);
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private:
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class RLFVideoTrack : public FixedRateVideoTrack {
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public:
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RLFVideoTrack(Common::SeekableReadStream *stream);
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~RLFVideoTrack();
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uint16 getWidth() const { return _width; }
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uint16 getHeight() const { return _height; }
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Graphics::PixelFormat getPixelFormat() const { return Graphics::PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0); /* RGB 555 */ }
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int getCurFrame() const { return _displayedFrame; }
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int getFrameCount() const { return _frameCount; }
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const Graphics::Surface *decodeNextFrame();
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bool isSeekable() const { return true; }
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bool seek(const Audio::Timestamp &time);
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protected:
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Common::Rational getFrameRate() const { return Common::Rational(1000, _frameTime); }
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private:
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enum EncodingType {
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Masked,
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Simple
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};
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struct Frame {
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EncodingType type;
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int8 *encodedData;
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uint32 encodedSize;
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};
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/**
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* Reads in the header of the RLF file
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*
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* @return Will return false if the header magic number is wrong
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*/
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bool readHeader();
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/**
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* Reads the next frame from the RLF file, stores the data in
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* a Frame object, then returns the object
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*
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* @return A Frame object representing the frame data
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*/
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Frame readNextFrame();
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/**
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* Applies the frame corresponding to frameNumber on top of _currentFrameBuffer.
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* This function requires _stream = false so it can look up the Frame object
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* referenced by frameNumber.
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*
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* @param frameNumber The frame number to apply to _currentFrameBuffer
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*/
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void applyFrameToCurrent(uint frameNumber);
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/**
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* Decode frame data that uses masked run length encoding. This is the encoding
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* used by P-frames.
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*
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* @param source The source pixel data
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* @param dest The destination buffer
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* @param sourceSize The size of the source pixel data
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* @param destSize The size of the destination buffer
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*/
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void decodeMaskedRunLengthEncoding(int8 *source, int8 *dest, uint32 sourceSize, uint32 destSize) const;
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/**
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* Decode frame data that uses simple run length encoding. This is the encoding
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* used by I-frames.
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*
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* @param source The source pixel data
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* @param dest The destination buffer
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* @param sourceSize The size of the source pixel data
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* @param destSize The size of the destination buffer
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*/
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void decodeSimpleRunLengthEncoding(int8 *source, int8 *dest, uint32 sourceSize, uint32 destSize) const;
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uint _lastFrameRead;
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uint _frameCount;
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uint _width;
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uint _height;
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uint32 _frameTime; // In milliseconds
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Frame *_frames;
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Common::Array<uint> _completeFrames;
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int _displayedFrame;
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Graphics::Surface _currentFrameBuffer;
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uint32 _frameBufferByteSize;
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Common::SeekableReadStream *_readStream;
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}; // RLFVideoTrack
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};
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} // End of namespace ZVision
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#endif
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