135 lines
4.0 KiB
C++
135 lines
4.0 KiB
C++
/* 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 3 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, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#include "common/scummsys.h"
|
|
|
|
/* VLC code
|
|
*
|
|
* Original copyright note: * Intel Indeo 4 (IV41, IV42, etc.) video decoder for ffmpeg
|
|
* written, produced, and directed by Alan Smithee
|
|
*/
|
|
|
|
#ifndef IMAGE_CODECS_INDEO_VLC_H
|
|
#define IMAGE_CODECS_INDEO_VLC_H
|
|
|
|
#include "image/codecs/indeo/get_bits.h"
|
|
|
|
namespace Image {
|
|
namespace Indeo {
|
|
|
|
#define VLC_TYPE int16
|
|
|
|
enum VLCFlag {
|
|
INIT_VLC_LE = 2,
|
|
INIT_VLC_USE_NEW_STATIC = 4
|
|
};
|
|
|
|
struct VLCcode {
|
|
uint8 bits;
|
|
uint16 symbol;
|
|
|
|
/**
|
|
* codeword, with the first bit-to-be-read in the msb
|
|
* (even if intended for a little-endian bitstream reader)
|
|
*/
|
|
uint32 code;
|
|
};
|
|
|
|
struct VLC {
|
|
private:
|
|
static int compareVlcSpec(const void *a, const void *b);
|
|
|
|
/**
|
|
* Gets a value of a given size from a table
|
|
* @param table Table to get data from
|
|
* @param idx Index of value to retrieve
|
|
* @param wrap Size of elements with alignment
|
|
* @param size Size of elements
|
|
*/
|
|
static uint getData(const void *table, uint idx, uint wrap, uint size);
|
|
public:
|
|
int _bits;
|
|
VLC_TYPE (*_table)[2]; ///< code, bits
|
|
int _tableSize, _tableAllocated;
|
|
|
|
VLC();
|
|
|
|
/* Build VLC decoding tables suitable for use with get_vlc().
|
|
|
|
'nbBits' sets the decoding table size (2^nbBits) entries. The
|
|
bigger it is, the faster is the decoding. But it should not be too
|
|
big to save memory and L1 cache. '9' is a good compromise.
|
|
|
|
'nbCodes' : number of vlcs codes
|
|
|
|
'bits' : table which gives the size (in bits) of each vlc code.
|
|
|
|
'codes' : table which gives the bit pattern of of each vlc code.
|
|
|
|
'symbols' : table which gives the values to be returned from get_vlc().
|
|
|
|
'xxx_wrap' : give the number of bytes between each entry of the
|
|
'bits' or 'codes' tables.
|
|
|
|
'xxx_size' : gives the number of bytes of each entry of the 'bits'
|
|
or 'codes' tables.
|
|
|
|
'wrap' and 'size' make it possible to use any memory configuration and types
|
|
(byte/word/long) to store the 'bits', 'codes', and 'symbols' tables.
|
|
|
|
'useStatic' should be set to 1 for tables, which should be freed
|
|
with av_free_static(), 0 if freeVlc() will be used.
|
|
*/
|
|
int init_vlc(int nbBits, int nbCodes, const void *bits, int bitsWrap,
|
|
int bitsSize, const void *codes, int codesWrap, int codesSize,
|
|
const void *symbols, int symbolsWrap, int symbolsSize, int flags);
|
|
|
|
int init_vlc(int nbBits, int nbCodes, const void *bits, int bitsWrap, int bitsSize,
|
|
const void *codes, int codesWrap, int codesSize, int flags);
|
|
|
|
/**
|
|
* Free VLC data
|
|
*/
|
|
void freeVlc();
|
|
|
|
|
|
/**
|
|
* Build VLC decoding tables suitable for use with get_vlc().
|
|
*
|
|
* @param tableNbBits max length of vlc codes to store directly in this table
|
|
* (Longer codes are delegated to subtables.)
|
|
*
|
|
* @param nbCodes number of elements in codes[]
|
|
*
|
|
* @param codes descriptions of the vlc codes
|
|
* These must be ordered such that codes going into the same subtable are contiguous.
|
|
* Sorting by VLCcode.code is sufficient, though not necessary.
|
|
*/
|
|
int buildTable(int tableNbBits, int nbCodes, VLCcode *codes, int flags);
|
|
|
|
int allocTable(int size, int useStatic);
|
|
};
|
|
|
|
} // End of namespace Indeo
|
|
} // End of namespace Image
|
|
|
|
#endif
|