mirror of
https://github.com/libretro/scummvm.git
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146 lines
3.9 KiB
C++
146 lines
3.9 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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/* Intel Indeo 4 decompressor, derived from ffmpeg.
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*
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* Original copyright note:
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* Intel Indeo 4 (IV31, IV32, etc.) video decoder for ffmpeg
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* written, produced, and directed by Alan Smithee
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*/
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#ifndef IMAGE_CODECS_INDEO4_H
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#define IMAGE_CODECS_INDEO4_H
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#include "image/codecs/indeo/get_bits.h"
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#include "image/codecs/indeo/indeo.h"
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namespace Image {
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using namespace Indeo;
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/**
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* Intel Indeo 4 decoder.
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*
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* Used by AVI.
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*
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* Used in video:
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* - AVIDecoder
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*/
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class Indeo4Decoder : public IndeoDecoderBase {
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struct Transform {
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InvTransformPtr *_invTrans;
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DCTransformPtr *_dcTrans;
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bool _is2dTrans;
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};
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public:
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Indeo4Decoder(uint16 width, uint16 height, uint bitsPerPixel = 16);
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virtual ~Indeo4Decoder() {}
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virtual const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream);
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static bool isIndeo4(Common::SeekableReadStream &stream);
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protected:
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/**
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* Decode the Indeo 4 picture header.
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* @returns 0 = Ok, negative number = error
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*/
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virtual int decodePictureHeader();
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/**
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* Rearrange decoding and reference buffers.
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*/
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virtual void switchBuffers();
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virtual bool isNonNullFrame() const;
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/**
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* Decode Indeo 4 band header.
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*
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* @param[in,out] band pointer to the band descriptor
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* @returns result code: 0 = OK, negative number = error
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*/
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virtual int decodeBandHeader(IVIBandDesc *band);
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/**
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* Decode information (block type, cbp, quant delta, motion vector)
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* for all macroblocks in the current tile.
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*
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* @param[in,out] band pointer to the band descriptor
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* @param[in,out] tile pointer to the tile descriptor
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* @returns result code: 0 = OK, negative number = error
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*/
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virtual int decodeMbInfo(IVIBandDesc *band, IVITile *tile);
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/**
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* Decodes optional transparency data within Indeo frames
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*/
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virtual void decodeTransparency();
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private:
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int scaleTileSize(int defSize, int sizeFactor);
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/**
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* Decode subdivision of a plane.
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* This is a simplified version that checks for two supported subdivisions:
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* - 1 wavelet band per plane, size factor 1:1, code pattern: 3
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* - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3
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* Anything else is either unsupported or corrupt.
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*
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* @param[in,out] gb The GetBit context
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* @returns Number of wavelet bands or 0 on error
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*/
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int decodePlaneSubdivision();
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private:
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/**
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* Standard picture dimensions
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*/
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static const uint _ivi4_common_pic_sizes[14];
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/**
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* Transformations list
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*/
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static Transform _transforms[18];
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static const uint8 *const _scan_index_to_tab[15];
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/**
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* Indeo 4 dequant tables
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*/
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static const uint16 _ivi4_quant_8x8_intra[9][64];
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static const uint16 _ivi4_quant_8x8_inter[9][64];
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static const uint16 _ivi4_quant_4x4_intra[5][16];
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static const uint16 _ivi4_quant_4x4_inter[5][16];
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/**
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* Table for mapping quant matrix index from the bitstream
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* into internal quant table number.
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*/
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static const uint8 _quant_index_to_tab[22];
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};
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} // End of namespace Image
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#endif
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