another optimization you can do for packing bits together...
the original one is :
-------------------------------------------------------------------------------------------------------------
void speex_bits_pack(SpeexBits *bits, int data, int nbBits)
{
int i;
unsigned int d=data;
if (bits->bytePtr+((nbBits+bits->bitPtr)>>3) >=
bits->buf_size)
{
//remain unchanged....
}
while(nbBits)
{
int bit;
bit = (d>>(nbBits-1))&1;
bits->bytes[bits->bytePtr] |= bit<<(7-bits->bitPtr);
bits->bitPtr++;
if (bits->bitPtr==8)
{
bits->bitPtr=0;
bits->bytePtr++;
}
bits->nbBits++;
nbBits--;
}
}
----------------------------------------------------------------------------------------------------------------
you can replace it by....
----------------------------------------------------------------------------------------------------------------
void speex_bits_pack(SpeexBits *bits, int data, int nbBits)
{
int i;
unsigned int d=data;
if (bits->bytePtr+((nbBits+bits->bitPtr)>>3) >=
bits->buf_size)
{
//remain unchanged....
}
*((unsigned long*)(bits->bytes+bits->bytePtr)) ((*(unsigned
long*)(bits->bytes+bits->bytePtr))&((1<<bits->bitPtr)-1))|((d&((1<<nbBits)-1))<<bits->bitPtr);
bits->bytePtr+= (bits->bitPtr+nbBits) >> 3; //advance the byte
ptr
bits->bitPtr = (bits->bitPtr+nbBits) & 7; //advance the bit ptr
}
-----------------------------------------------------------------------------------------------------------------
more optimizations next time....
Frédo
<p><p>--- >8 ----
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