filter.cc

PIXIL is a small footprint operating environment, complete with PDA PIM applications, a browser and

	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    SAVE;
	}
	break;
    case 15:
	for (; i; i--, vp += 31) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    }
#else
    // reduced memory footprint and cache trashing for small cache machines...
    for (; i; i--, vp += 15) {
	OS;
	switch (15 - calcbufferoffset) {
	case 0:
	    OP;
	case 1:
	    OP;
	case 2:
	    OP;
	case 3:
	    OP;
	case 4:
	    OP;
	case 5:
	    OP;
	case 6:
	    OP;
	case 7:
	    OP;
	case 8:
	    OP;
	case 9:
	    OP;
	case 10:
	    OP;
	case 11:
	    OP;
	case 12:
	    OP;
	case 13:
	    OP;
	case 14:
	    OP;
	}
	if (calcbufferoffset == 15) {
	    vp += 16;
	} else {
	    XX;
	    switch (calcbufferoffset) {
	    case 0:
		OP;
	    case 1:
		OP;
	    case 2:
		OP;
	    case 3:
		OP;
	    case 4:
		OP;
	    case 5:
		OP;
	    case 6:
		OP;
	    case 7:
		OP;
	    case 8:
		OP;
	    case 9:
		OP;
	    case 10:
		OP;
	    case 11:
		OP;
	    case 12:
		OP;
	    case 13:
		OP;
	    }
	}
	SAVE;
    }
#endif
}

#undef OS
#undef XX
#undef OP
#undef SAVE

#define SAVE \
	raw=RAW(r1); \
        if(raw>MAXSCALE)raw=MAXSCALE; \
	if(raw<MINSCALE)raw=MINSCALE; \
	putraw(raw);  \
	raw=RAW(r2); \
	if(raw>MAXSCALE)raw=MAXSCALE; \
	if(raw<MINSCALE)raw=MINSCALE; \
	putraw(raw);
#define OS r1=*vp1 * *dp; \
           r2=*vp2 * *dp++
#define XX vp1+=15;r1+=*vp1 * *dp; \
	   vp2+=15;r2+=*vp2 * *dp++
#define OP r1+=*--vp1 * *dp; \
	   r2+=*--vp2 * *dp++


inline void
Mpegtoraw::generate(void)
{
    int i;
    REAL r1, r2;
    register REAL *vp1, *vp2;
    register const REAL *dp;
    int raw;

    dp = filter;
    vp1 = calcbufferL[currentcalcbuffer] + calcbufferoffset;
    vp2 = calcbufferR[currentcalcbuffer] + calcbufferoffset;
// actual_v+actual_write_pos;

    i = 32;
#if 0
    switch (calcbufferoffset) {
    case 0:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    XX;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 1:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    XX;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 2:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    XX;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 3:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    XX;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 4:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 5:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 6:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 7:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 8:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 9:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 10:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 11:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 12:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    case 13:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    OP;
	    SAVE;
	}
	break;
    case 14:
	for (; i; i--, vp1 += 15, vp2 += 15) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    XX;
	    SAVE;
	}
	break;
    case 15:
	for (; i; i--, vp1 += 31, vp2 += 31) {
	    OS;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    OP;
	    SAVE;
	}
	break;
    }
#else
    // reduced memory footprint and cache trashing...
    for (; i; i--, vp1 += 15, vp2 += 15) {
	OS;
	switch (15 - calcbufferoffset) {
	case 0:
	    OP;
	case 1:
	    OP;
	case 2:
	    OP;
	case 3:
	    OP;
	case 4:
	    OP;
	case 5:
	    OP;
	case 6:
	    OP;
	case 7:
	    OP;
	case 8:
	    OP;
	case 9:
	    OP;
	case 10:
	    OP;
	case 11:
	    OP;
	case 12:
	    OP;
	case 13:
	    OP;
	case 14:
	    OP;
	}
	if (calcbufferoffset == 15) {
	    vp1 += 16;
	    vp2 += 16;
	} else {
	    XX;
	    switch (calcbufferoffset) {
	    case 0:
		OP;
	    case 1:
		OP;
	    case 2:
		OP;
	    case 3:
		OP;
	    case 4:
		OP;
	    case 5:
		OP;
	    case 6:
		OP;
	    case 7:
		OP;
	    case 8:
		OP;
	    case 9:
		OP;
	    case 10:
		OP;
	    case 11:
		OP;
	    case 12:
		OP;
	    case 13:
		OP;
	    }
	}
	SAVE;
    }
#endif
}


void
Mpegtoraw::subbandsynthesis(REAL * fractionL, REAL * fractionR)
{

    if (downfrequency) {
	subbandsynthesis_2(fractionL, fractionR);
	return;
    }

    computebuffer(fractionL, calcbufferL);
    if (!outputstereo)
	generatesingle();
    else {
	computebuffer(fractionR, calcbufferR);
	generate();
    }

    if (calcbufferoffset < 15)
	calcbufferoffset++;
    else
	calcbufferoffset = 0;

    currentcalcbuffer ^= 1;


}