AN2121 Freescale Semiconductor / Motorola, AN2121 Datasheet - Page 32

• Manufacturer Part Number: AN2121
• Description: JPEG2000 Arithmetic Encoding on StarCore SC140
• Manufacturer: Freescale Semiconductor / Motorola

} /* ByteOut */
/* ======================================================================== */
/*
*/
static inline void Renorme(void)
{
} /* Renorme */
/* ======================================================================== */
/*
*/
void ArithEncEncode(uint8 D, uint16 CX)
{
28
Renormalize the lower bound and size of the probability range.
See Section C.2.6 and Figure C-8.
is at least 0.75
Encode a bit using the given context.
Output bits will be written to the file given to ArithEncInit().
See Section C.2.2 and B.2.3
param: D
param: CX -
}
-
}
else
do
{
}
while (A <= 0x8000);
ArithEncContext* pCX;
uint32 I;
uint32 QeI;
uint32 MPS;
pCX = &(contexts[CX]);
/* Put the current context into globals, and write them back later */
I = pCX->I;
MPS = pCX->MPS;
QeI = Qe[I];
if (pCX->MPS == D)
{
The bit to encode, either 0 or 1.
The number of the context to use.
JPEG2000 Arithmetic Encoding on the StarCore SC140
}
ByteOutRight();
/* Check that there will be no overflow with these shifts */
A <<= 1;
C <<= 1;
CT -= 1;
if (CT == 0)
/* CodeMPS */
A -= QeI;
/* Doing this test first might speed up process */
if (A >= 0x8000u)
/*if ((A & 0x8000) != 0)*/
{
}
else
{
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ByteOutRight();
ByteOut();
C += QeI;
/* Doing this test first might speed up process */
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This function ensures that the range (A)