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Diffstat (limited to 'image/codecs/indeo4.h')
| -rw-r--r-- | image/codecs/indeo4.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/image/codecs/indeo4.h b/image/codecs/indeo4.h new file mode 100644 index 0000000000..4a6279db37 --- /dev/null +++ b/image/codecs/indeo4.h @@ -0,0 +1,140 @@ +/* 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 2 + * 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, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + +/* Intel Indeo 4 decompressor, derived from ffmpeg. + * + * Original copyright note: + * Intel Indeo 4 (IV31, IV32, etc.) video decoder for ffmpeg + * written, produced, and directed by Alan Smithee + */ + +#ifndef IMAGE_CODECS_INDEO4_H +#define IMAGE_CODECS_INDEO4_H + +#include "image/codecs/indeo/get_bits.h" +#include "image/codecs/indeo/indeo.h" + +namespace Image { + +using namespace Indeo; + +/** + * Intel Indeo 4 decoder. + * + * Used by AVI. + * + * Used in video: + * - AVIDecoder + */ +class Indeo4Decoder : public IndeoDecoderBase { + struct Transform { + InvTransformPtr *_invTrans; + DCTransformPtr *_dcTrans; + bool _is2dTrans; + }; +public: + Indeo4Decoder(uint16 width, uint16 height); + virtual ~Indeo4Decoder() {} + + virtual const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream); + + static bool isIndeo4(Common::SeekableReadStream &stream); +protected: + /** + * Decode the Indeo 4 picture header. + * @returns 0 = Ok, negative number = error + */ + virtual int decodePictureHeader(); + + /** + * Rearrange decoding and reference buffers. + */ + virtual void switchBuffers(); + + virtual bool isNonNullFrame() const; + + /** + * Decode Indeo 4 band header. + * + * @param[in,out] band pointer to the band descriptor + * @returns result code: 0 = OK, negative number = error + */ + virtual int decodeBandHeader(IVIBandDesc *band); + + /** + * Decode information (block type, cbp, quant delta, motion vector) + * for all macroblocks in the current tile. + * + * @param[in,out] band pointer to the band descriptor + * @param[in,out] tile pointer to the tile descriptor + * @returns result code: 0 = OK, negative number = error + */ + virtual int decodeMbInfo(IVIBandDesc *band, IVITile *tile); +private: + int scaleTileSize(int defSize, int sizeFactor); + + /** + * Decode subdivision of a plane. + * This is a simplified version that checks for two supported subdivisions: + * - 1 wavelet band per plane, size factor 1:1, code pattern: 3 + * - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3 + * Anything else is either unsupported or corrupt. + * + * @param[in,out] gb The GetBit context + * @returns Number of wavelet bands or 0 on error + */ + int decodePlaneSubdivision(); + +private: + /** + * Standard picture dimensions + */ + static const uint _ivi4_common_pic_sizes[14]; + + /** + * Transformations list + */ + static Transform _transforms[18]; + + static const uint8 *const _scan_index_to_tab[15]; + + /** + * Indeo 4 dequant tables + */ + static const uint16 _ivi4_quant_8x8_intra[9][64]; + + static const uint16 _ivi4_quant_8x8_inter[9][64]; + + static const uint16 _ivi4_quant_4x4_intra[5][16]; + + static const uint16 _ivi4_quant_4x4_inter[5][16]; + + /** + * Table for mapping quant matrix index from the bitstream + * into internal quant table number. + */ + static const uint8 _quant_index_to_tab[22]; +}; + +} // End of namespace Image + +#endif |