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Diffstat (limited to 'image/codecs/indeo5.h')
| -rw-r--r-- | image/codecs/indeo5.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/image/codecs/indeo5.h b/image/codecs/indeo5.h new file mode 100644 index 0000000000..704bda5e4b --- /dev/null +++ b/image/codecs/indeo5.h @@ -0,0 +1,136 @@ +/* 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_INDEO5_H +#define IMAGE_CODECS_INDEO5_H + +#include "image/codecs/indeo/get_bits.h" +#include "image/codecs/indeo/indeo.h" + +namespace Image { + +using namespace Indeo; + +/** + * Intel Indeo 5 decoder. + * + * Used by AVI. + * + * Used in video: + * - AVIDecoder + */ +class Indeo5Decoder : public IndeoDecoderBase { + struct Transform { + InvTransformPtr *inv_trans; + DCTransformPtr *dc_trans; + int is_2d_trans; + }; +public: + Indeo5Decoder(uint16 width, uint16 height); + virtual ~Indeo5Decoder() {} + + virtual const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream); + + static bool isIndeo5(Common::SeekableReadStream &stream); +protected: + /** + * Decode the Indeo 5 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 + * @return 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 + * @return result code: 0 = OK, negative number = error + */ + virtual int decodeMbInfo(IVIBandDesc *band, IVITile *tile); +private: + /** + * Decode Indeo5 GOP (Group of pictures) header. + * This header is present in key frames only. + * It defines parameters for all frames in a GOP. + * @returns result code: 0 = OK, -1 = error + */ + int decode_gop_header(); + + /** + * Skip a header extension. + */ + int skip_hdr_extension(); + +private: + /** + * standard picture dimensions (width, height divided by 4) + */ + static const uint8 _commonPicSizes[30]; + + /** + * Indeo5 dequantization matrixes consist of two tables: base table + * and scale table. The base table defines the dequantization matrix + * itself and the scale table tells how this matrix should be scaled + * for a particular quant level (0...24). + * + * ivi5_base_quant_bbb_ttt - base tables for block size 'bbb' of type 'ttt' + * ivi5_scale_quant_bbb_ttt - scale tables for block size 'bbb' of type 'ttt' + */ + static const uint16 _baseQuant8x8Inter[5][64]; + static const uint16 _baseQuant8x8Intra[5][64]; + + static const uint16 _baseQuant4x4Inter[16]; + static const uint16 _baseQuant4x4Intra[16]; + + static const uint8 _scaleQuant8x8Inter[5][24]; + static const uint8 _scaleQuant8x8Intra[5][24]; + + static const uint8 _scaleQuant4x4Inter[24]; + static const uint8 _scaleQuant4x4Intra[24]; +}; + +} // End of namespace Image + +#endif |