#ifndef _DSP_H
#define _DSP_H

#define BlockLen 64

inline short clamp(long a)
{
	return ((a > 32767) ? 32767
			: (a < -32768 ? -32768
			   : a));
}

inline short _rnd(long a)
{
	return a + (1<<15);
}

inline short _sadd(short a, short b)
{
	return clamp(long(a) + long(b));
}

inline short _ssub(short a, short b)
{
	return clamp(long(a) - long(b));
}

inline long _lsadd(long a, long b)
{
	long sum = a + b;
    if (a > 0 && b > 0) {
        if (sum < a || sum < b)
            sum = 0x7fffffff;
    }
    else if (a < 0 && b < 0) {
        if (sum > a || sum > b)
            sum = 0x80000000;
    }
	return sum;
}

inline short _smpy(short a, short b)
{
	return (long(a)*long(b)) >> 15;
}

inline long _smac(long src, short a, short b)
{
	return _lsadd(src, _smpy(a, b));
}

inline float to_float(short a)
{
	return a/32768.0f;
}

inline short from_float(float f)
{
	return clamp(long(f*32768.0f));
}

void WaitAudio(short** precv, short** pxmit);
void SerialTX(int ch);
int SerialRX();

extern short used_recv_chans;
extern short used_xmit_chans;

extern short xmit_append;

extern char* xmit_prefix;
extern char* recv_prefix;

#endif // header guard