mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-11-10 14:51:40 +00:00
338 lines
7.6 KiB
C
338 lines
7.6 KiB
C
/* Ppmd7Enc.c -- Ppmd7z (PPMdH with 7z Range Coder) Encoder
|
|
2023-04-02 : Igor Pavlov : Public domain
|
|
This code is based on:
|
|
PPMd var.H (2001): Dmitry Shkarin : Public domain */
|
|
|
|
|
|
#include "Precomp.h"
|
|
|
|
#include "Ppmd7.h"
|
|
|
|
#define kTopValue ((UInt32)1 << 24)
|
|
|
|
#define R (&p->rc.enc)
|
|
|
|
void Ppmd7z_Init_RangeEnc(CPpmd7 *p)
|
|
{
|
|
R->Low = 0;
|
|
R->Range = 0xFFFFFFFF;
|
|
R->Cache = 0;
|
|
R->CacheSize = 1;
|
|
}
|
|
|
|
Z7_NO_INLINE
|
|
static void Ppmd7z_RangeEnc_ShiftLow(CPpmd7 *p)
|
|
{
|
|
if ((UInt32)R->Low < (UInt32)0xFF000000 || (unsigned)(R->Low >> 32) != 0)
|
|
{
|
|
Byte temp = R->Cache;
|
|
do
|
|
{
|
|
IByteOut_Write(R->Stream, (Byte)(temp + (Byte)(R->Low >> 32)));
|
|
temp = 0xFF;
|
|
}
|
|
while (--R->CacheSize != 0);
|
|
R->Cache = (Byte)((UInt32)R->Low >> 24);
|
|
}
|
|
R->CacheSize++;
|
|
R->Low = (UInt32)((UInt32)R->Low << 8);
|
|
}
|
|
|
|
#define RC_NORM_BASE(p) if (R->Range < kTopValue) { R->Range <<= 8; Ppmd7z_RangeEnc_ShiftLow(p);
|
|
#define RC_NORM_1(p) RC_NORM_BASE(p) }
|
|
#define RC_NORM(p) RC_NORM_BASE(p) RC_NORM_BASE(p) }}
|
|
|
|
// we must use only one type of Normalization from two: LOCAL or REMOTE
|
|
#define RC_NORM_LOCAL(p) // RC_NORM(p)
|
|
#define RC_NORM_REMOTE(p) RC_NORM(p)
|
|
|
|
/*
|
|
#define Ppmd7z_RangeEnc_Encode(p, start, _size_) \
|
|
{ UInt32 size = _size_; \
|
|
R->Low += start * R->Range; \
|
|
R->Range *= size; \
|
|
RC_NORM_LOCAL(p); }
|
|
*/
|
|
|
|
Z7_FORCE_INLINE
|
|
// Z7_NO_INLINE
|
|
static void Ppmd7z_RangeEnc_Encode(CPpmd7 *p, UInt32 start, UInt32 size)
|
|
{
|
|
R->Low += start * R->Range;
|
|
R->Range *= size;
|
|
RC_NORM_LOCAL(p)
|
|
}
|
|
|
|
void Ppmd7z_Flush_RangeEnc(CPpmd7 *p)
|
|
{
|
|
unsigned i;
|
|
for (i = 0; i < 5; i++)
|
|
Ppmd7z_RangeEnc_ShiftLow(p);
|
|
}
|
|
|
|
|
|
|
|
#define RC_Encode(start, size) Ppmd7z_RangeEnc_Encode(p, start, size);
|
|
#define RC_EncodeFinal(start, size) RC_Encode(start, size) RC_NORM_REMOTE(p)
|
|
|
|
#define CTX(ref) ((CPpmd7_Context *)Ppmd7_GetContext(p, ref))
|
|
#define SUFFIX(ctx) CTX((ctx)->Suffix)
|
|
// typedef CPpmd7_Context * CTX_PTR;
|
|
#define SUCCESSOR(p) Ppmd_GET_SUCCESSOR(p)
|
|
|
|
void Ppmd7_UpdateModel(CPpmd7 *p);
|
|
|
|
#define MASK(sym) ((unsigned char *)charMask)[sym]
|
|
|
|
Z7_FORCE_INLINE
|
|
static
|
|
void Ppmd7z_EncodeSymbol(CPpmd7 *p, int symbol)
|
|
{
|
|
size_t charMask[256 / sizeof(size_t)];
|
|
|
|
if (p->MinContext->NumStats != 1)
|
|
{
|
|
CPpmd_State *s = Ppmd7_GetStats(p, p->MinContext);
|
|
UInt32 sum;
|
|
unsigned i;
|
|
|
|
|
|
|
|
|
|
R->Range /= p->MinContext->Union2.SummFreq;
|
|
|
|
if (s->Symbol == symbol)
|
|
{
|
|
// R->Range /= p->MinContext->Union2.SummFreq;
|
|
RC_EncodeFinal(0, s->Freq)
|
|
p->FoundState = s;
|
|
Ppmd7_Update1_0(p);
|
|
return;
|
|
}
|
|
p->PrevSuccess = 0;
|
|
sum = s->Freq;
|
|
i = (unsigned)p->MinContext->NumStats - 1;
|
|
do
|
|
{
|
|
if ((++s)->Symbol == symbol)
|
|
{
|
|
// R->Range /= p->MinContext->Union2.SummFreq;
|
|
RC_EncodeFinal(sum, s->Freq)
|
|
p->FoundState = s;
|
|
Ppmd7_Update1(p);
|
|
return;
|
|
}
|
|
sum += s->Freq;
|
|
}
|
|
while (--i);
|
|
|
|
// R->Range /= p->MinContext->Union2.SummFreq;
|
|
RC_Encode(sum, p->MinContext->Union2.SummFreq - sum)
|
|
|
|
p->HiBitsFlag = PPMD7_HiBitsFlag_3(p->FoundState->Symbol);
|
|
PPMD_SetAllBitsIn256Bytes(charMask)
|
|
// MASK(s->Symbol) = 0;
|
|
// i = p->MinContext->NumStats - 1;
|
|
// do { MASK((--s)->Symbol) = 0; } while (--i);
|
|
{
|
|
CPpmd_State *s2 = Ppmd7_GetStats(p, p->MinContext);
|
|
MASK(s->Symbol) = 0;
|
|
do
|
|
{
|
|
unsigned sym0 = s2[0].Symbol;
|
|
unsigned sym1 = s2[1].Symbol;
|
|
s2 += 2;
|
|
MASK(sym0) = 0;
|
|
MASK(sym1) = 0;
|
|
}
|
|
while (s2 < s);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
UInt16 *prob = Ppmd7_GetBinSumm(p);
|
|
CPpmd_State *s = Ppmd7Context_OneState(p->MinContext);
|
|
UInt32 pr = *prob;
|
|
const UInt32 bound = (R->Range >> 14) * pr;
|
|
pr = PPMD_UPDATE_PROB_1(pr);
|
|
if (s->Symbol == symbol)
|
|
{
|
|
*prob = (UInt16)(pr + (1 << PPMD_INT_BITS));
|
|
// RangeEnc_EncodeBit_0(p, bound);
|
|
R->Range = bound;
|
|
RC_NORM_1(p)
|
|
|
|
// p->FoundState = s;
|
|
// Ppmd7_UpdateBin(p);
|
|
{
|
|
const unsigned freq = s->Freq;
|
|
CPpmd7_Context *c = CTX(SUCCESSOR(s));
|
|
p->FoundState = s;
|
|
p->PrevSuccess = 1;
|
|
p->RunLength++;
|
|
s->Freq = (Byte)(freq + (freq < 128));
|
|
// NextContext(p);
|
|
if (p->OrderFall == 0 && (const Byte *)c > p->Text)
|
|
p->MaxContext = p->MinContext = c;
|
|
else
|
|
Ppmd7_UpdateModel(p);
|
|
}
|
|
return;
|
|
}
|
|
|
|
*prob = (UInt16)pr;
|
|
p->InitEsc = p->ExpEscape[pr >> 10];
|
|
// RangeEnc_EncodeBit_1(p, bound);
|
|
R->Low += bound;
|
|
R->Range -= bound;
|
|
RC_NORM_LOCAL(p)
|
|
|
|
PPMD_SetAllBitsIn256Bytes(charMask)
|
|
MASK(s->Symbol) = 0;
|
|
p->PrevSuccess = 0;
|
|
}
|
|
|
|
for (;;)
|
|
{
|
|
CPpmd_See *see;
|
|
CPpmd_State *s;
|
|
UInt32 sum, escFreq;
|
|
CPpmd7_Context *mc;
|
|
unsigned i, numMasked;
|
|
|
|
RC_NORM_REMOTE(p)
|
|
|
|
mc = p->MinContext;
|
|
numMasked = mc->NumStats;
|
|
|
|
do
|
|
{
|
|
p->OrderFall++;
|
|
if (!mc->Suffix)
|
|
return; /* EndMarker (symbol = -1) */
|
|
mc = Ppmd7_GetContext(p, mc->Suffix);
|
|
i = mc->NumStats;
|
|
}
|
|
while (i == numMasked);
|
|
|
|
p->MinContext = mc;
|
|
|
|
// see = Ppmd7_MakeEscFreq(p, numMasked, &escFreq);
|
|
{
|
|
if (i != 256)
|
|
{
|
|
unsigned nonMasked = i - numMasked;
|
|
see = p->See[(unsigned)p->NS2Indx[(size_t)nonMasked - 1]]
|
|
+ p->HiBitsFlag
|
|
+ (nonMasked < (unsigned)SUFFIX(mc)->NumStats - i)
|
|
+ 2 * (unsigned)(mc->Union2.SummFreq < 11 * i)
|
|
+ 4 * (unsigned)(numMasked > nonMasked);
|
|
{
|
|
// if (see->Summ) field is larger than 16-bit, we need only low 16 bits of Summ
|
|
unsigned summ = (UInt16)see->Summ; // & 0xFFFF
|
|
unsigned r = (summ >> see->Shift);
|
|
see->Summ = (UInt16)(summ - r);
|
|
escFreq = r + (r == 0);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
see = &p->DummySee;
|
|
escFreq = 1;
|
|
}
|
|
}
|
|
|
|
s = Ppmd7_GetStats(p, mc);
|
|
sum = 0;
|
|
// i = mc->NumStats;
|
|
|
|
do
|
|
{
|
|
const unsigned cur = s->Symbol;
|
|
if ((int)cur == symbol)
|
|
{
|
|
const UInt32 low = sum;
|
|
const UInt32 freq = s->Freq;
|
|
unsigned num2;
|
|
|
|
Ppmd_See_UPDATE(see)
|
|
p->FoundState = s;
|
|
sum += escFreq;
|
|
|
|
num2 = i / 2;
|
|
i &= 1;
|
|
sum += freq & (0 - (UInt32)i);
|
|
if (num2 != 0)
|
|
{
|
|
s += i;
|
|
for (;;)
|
|
{
|
|
unsigned sym0 = s[0].Symbol;
|
|
unsigned sym1 = s[1].Symbol;
|
|
s += 2;
|
|
sum += (s[-2].Freq & (unsigned)(MASK(sym0)));
|
|
sum += (s[-1].Freq & (unsigned)(MASK(sym1)));
|
|
if (--num2 == 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
R->Range /= sum;
|
|
RC_EncodeFinal(low, freq)
|
|
Ppmd7_Update2(p);
|
|
return;
|
|
}
|
|
sum += (s->Freq & (unsigned)(MASK(cur)));
|
|
s++;
|
|
}
|
|
while (--i);
|
|
|
|
{
|
|
const UInt32 total = sum + escFreq;
|
|
see->Summ = (UInt16)(see->Summ + total);
|
|
|
|
R->Range /= total;
|
|
RC_Encode(sum, escFreq)
|
|
}
|
|
|
|
{
|
|
const CPpmd_State *s2 = Ppmd7_GetStats(p, p->MinContext);
|
|
s--;
|
|
MASK(s->Symbol) = 0;
|
|
do
|
|
{
|
|
const unsigned sym0 = s2[0].Symbol;
|
|
const unsigned sym1 = s2[1].Symbol;
|
|
s2 += 2;
|
|
MASK(sym0) = 0;
|
|
MASK(sym1) = 0;
|
|
}
|
|
while (s2 < s);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void Ppmd7z_EncodeSymbols(CPpmd7 *p, const Byte *buf, const Byte *lim)
|
|
{
|
|
for (; buf < lim; buf++)
|
|
{
|
|
Ppmd7z_EncodeSymbol(p, *buf);
|
|
}
|
|
}
|
|
|
|
#undef kTopValue
|
|
#undef WRITE_BYTE
|
|
#undef RC_NORM_BASE
|
|
#undef RC_NORM_1
|
|
#undef RC_NORM
|
|
#undef RC_NORM_LOCAL
|
|
#undef RC_NORM_REMOTE
|
|
#undef R
|
|
#undef RC_Encode
|
|
#undef RC_EncodeFinal
|
|
#undef SUFFIX
|
|
#undef CTX
|
|
#undef SUCCESSOR
|
|
#undef MASK
|