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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_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, uint bitsPerPixel = 16);
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);
/**
* Decodes optional transparency data within Indeo frames
*/
virtual void decodeTransparency();
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
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