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/* 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
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