mirror of
https://github.com/libretro/scummvm.git
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136 lines
3.8 KiB
C++
136 lines
3.8 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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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_INDEO5_H
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#define IMAGE_CODECS_INDEO5_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 5 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 Indeo5Decoder : public IndeoDecoderBase {
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struct Transform {
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InvTransformPtr *inv_trans;
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DCTransformPtr *dc_trans;
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int is_2d_trans;
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};
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public:
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Indeo5Decoder(uint16 width, uint16 height, uint bitsPerPixel = 16);
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~Indeo5Decoder() override {}
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const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream) override;
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static bool isIndeo5(Common::SeekableReadStream &stream);
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protected:
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/**
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* Decode the Indeo 5 picture header.
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* @returns 0 = Ok, negative number = error
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*/
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int decodePictureHeader() override;
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/**
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* Rearrange decoding and reference buffers.
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*/
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void switchBuffers() override;
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bool isNonNullFrame() const override;
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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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* @return result code: 0 = OK, negative number = error
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*/
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int decodeBandHeader(IVIBandDesc *band) override;
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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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* @return result code: 0 = OK, negative number = error
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*/
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int decodeMbInfo(IVIBandDesc *band, IVITile *tile) override;
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private:
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/**
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* Decode Indeo5 GOP (Group of pictures) header.
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* This header is present in key frames only.
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* It defines parameters for all frames in a GOP.
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* @returns result code: 0 = OK, -1 = error
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*/
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int decode_gop_header();
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/**
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* Skip a header extension.
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*/
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int skip_hdr_extension();
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private:
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/**
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* standard picture dimensions (width, height divided by 4)
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*/
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static const uint8 _commonPicSizes[30];
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/**
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* Indeo5 dequantization matrixes consist of two tables: base table
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* and scale table. The base table defines the dequantization matrix
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* itself and the scale table tells how this matrix should be scaled
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* for a particular quant level (0...24).
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*
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* ivi5_base_quant_bbb_ttt - base tables for block size 'bbb' of type 'ttt'
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* ivi5_scale_quant_bbb_ttt - scale tables for block size 'bbb' of type 'ttt'
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*/
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static const uint16 _baseQuant8x8Inter[5][64];
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static const uint16 _baseQuant8x8Intra[5][64];
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static const uint16 _baseQuant4x4Inter[16];
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static const uint16 _baseQuant4x4Intra[16];
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static const uint8 _scaleQuant8x8Inter[5][24];
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static const uint8 _scaleQuant8x8Intra[5][24];
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static const uint8 _scaleQuant4x4Inter[24];
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static const uint8 _scaleQuant4x4Intra[24];
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};
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} // End of namespace Image
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#endif
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