shithub: duke3d

ref: a7d509eca0ad2ece012d0fc46f73bdbf65695ac2
dir: /Game/src/audiolib/mv_mix.c/

#include "multivoc.h"

extern char  *MV_MixDestination;
extern unsigned long MV_MixPosition;
extern int *MV_GLast, *MV_GPos, *MV_GVal;

extern int MV_LeftVolume;
extern int MV_RightVolume;
extern int MV_MaxVolume;

// extern unsigned char *MV_HarshClipTable;

extern int MV_RightChannelOffset;
extern int MV_SampleSize;
extern int MV_Channels;

//int do_cubic = 1;

extern int g_CV_CubicInterpolation;

#define do_cubic (g_CV_CubicInterpolation)

#define gval0 MV_GVal[*MV_GPos&3]
#define gval(x) MV_GVal[(*MV_GPos+x)&3]

int MV_cubic(int position)
{
	int xd, fa;
	xd = (position >> 1) & 0x7FFF;

	fa  = gval(3) - 3*gval(2) + 3*gval(1) - gval0;
	fa *= (xd - (2<<15)) / 6;
	fa >>= 15;
	fa += gval(2) - gval(1) - gval(1) + gval0;
	fa *= (xd - (1<<15)) >> 1;
	fa >>= 15;
	fa += gval(1) - gval0;
	fa *= xd;
	fa >>= 15;
	fa += gval0;
	return fa;
}

static int MV_cubic8(const unsigned char *src, int position, int rate)
{
	int temp, hpos = position >> 16;

	if (abs(hpos - *MV_GLast) > 3) *MV_GLast = hpos;

	temp = hpos;

	while (hpos > *MV_GLast)
	{
		gval0 = ((int)src[temp++] - 0x80) << 8;
		*MV_GPos = (*MV_GPos + 1) & 3;
		(*MV_GLast)++;
	}

	return do_cubic ? (MV_cubic(position) >> 8) + 0x80 : (gval(3) >> 8) + 0x80;
}

static int MV_cubic16(const short *src, int position, int rate)
{
	int temp, hpos = position >> 16;

	if (abs(hpos - *MV_GLast) > 3) *MV_GLast = hpos;

	temp = hpos;

	while (hpos > *MV_GLast)
	{
		gval0 = src[temp++];
		*MV_GPos = (*MV_GPos + 1) & 3;
		(*MV_GLast)++;
	}

	return do_cubic ? MV_cubic(position) : gval(3);
}

static int MV_cubic8to16(const unsigned char *src, int position, int rate)
{
	int temp, hpos = position >> 16;

	if (abs(hpos - *MV_GLast) > 3) *MV_GLast = hpos;

	temp = hpos;

	while (hpos > *MV_GLast)
	{
		gval0 = ((int)src[temp++] - 0x80) << 8;
		*MV_GPos = (*MV_GPos + 1) & 3;
		(*MV_GLast)++;
	}

	return do_cubic ? MV_cubic(position) : gval(3);
}

static int MV_cubic16to8(const short *src, int position, int rate)
{
	int temp, hpos = position >> 16;

	if (abs(hpos - *MV_GLast) > 3) *MV_GLast = hpos;

	temp = hpos;

	while (hpos > *MV_GLast)
	{
		gval0 = src[temp++];
		*MV_GPos = (*MV_GPos + 1) & 3;
		(*MV_GLast)++;
	}

	return do_cubic ? (MV_cubic(position) >> 8) + 0x80 : (gval(3) >> 8) + 0x80;
}

void MV_Mix8BitMono( unsigned long position, unsigned long rate,
   const char *start, unsigned long length )
{
	const unsigned char *src;
	unsigned char *dest;
	unsigned int i;

	src = (const unsigned char *)start;
	dest = (unsigned char *)MV_MixDestination;

	for (i = 0; i < length; i++) {
		int s = MV_cubic8to16(src, position, rate);
		int d = (*dest - 0x80) << 8;
		
		d += (s * MV_LeftVolume) / MV_MaxVolume;

		if (d < -32768) *dest = 0;
		else if (d > 32767) *dest = 255;
		else *dest = (d >> 8) + 128;
		
		position += rate;
		dest += MV_SampleSize;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;
}

void MV_Mix8BitStereo( unsigned long position,
   unsigned long rate, const char *start, unsigned long length )
{
	const unsigned char *src;
	unsigned char *dest;
	unsigned int i;
	
	src = (const unsigned char *)start;
	dest = (unsigned char *)MV_MixDestination;

	for (i = 0; i < length; i++) {
		int s = MV_cubic8to16(src, position, rate);
		int dl = (dest[0] - 0x80) << 8;
		int dr = (dest[MV_RightChannelOffset] - 0x80) << 8;
		
		dl += (MV_LeftVolume * s) / MV_MaxVolume;
		dr += (MV_RightVolume * s) / MV_MaxVolume;

		if (dl < -32768) dest[0] = 0;
		else if (dl > 32767) dest[0] = 255;
		else dest[0] = (dl >> 8) + 128;

		if (dr < -32768) dest[MV_RightChannelOffset] = 0;
		else if (dr > 32767) dest[MV_RightChannelOffset] = 255;
		else dest[MV_RightChannelOffset] = (dl >> 8) + 128;
		
		position += rate;
		dest += MV_SampleSize;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;
}

void MV_Mix16BitMono( unsigned long position,
   unsigned long rate, const char *start, unsigned long length )
{
	const unsigned char *src;
	short *dest;
	unsigned int i;

	src = (const unsigned char *)start;
	dest = (short *)MV_MixDestination;
	
	for (i = 0; i < length; i++) {
		int s = MV_cubic8to16(src, position, rate);
		int d = dest[0];

		d += (MV_LeftVolume * s) / MV_MaxVolume;

		if (d < -32768) *dest = -32768;
		else if (d >  32767) *dest =  32767;
		else *dest = d;
		
		position += rate;
		dest += MV_SampleSize/2;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;
}

void MV_Mix16BitStereo( unsigned long position,
   unsigned long rate, const char *start, unsigned long length )
{
	const unsigned char *src;
	short *dest;
	unsigned int i;

	src = (unsigned char *)start;
	dest = (short *)MV_MixDestination;
	
	for (i = 0; i < length; i++) {
		int s = MV_cubic8to16(src, position, rate);
		int dl = dest[0];
		int dr = dest[MV_RightChannelOffset/2];
		
		dl += (MV_LeftVolume * s) / MV_MaxVolume;
		dr += (MV_RightVolume * s) / MV_MaxVolume;
		
		if (dl < -32768) dest[0] = -32768;
		else if (dl >  32767) dest[0] =  32767;
		else dest[0] = dl;

		if (dr < -32768) dest[MV_RightChannelOffset/2] = -32768;
		else if (dr >  32767) dest[MV_RightChannelOffset/2] =  32767;
		else dest[MV_RightChannelOffset/2] = dr;
		
		position += rate;
		dest += MV_SampleSize/2;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;
}

void MV_Mix8BitMono16( unsigned long position, unsigned long rate,
   const char *start, unsigned long length )
{
	const short *src;
	unsigned char *dest;
	unsigned int i;

	src = (const short *)start;
	dest = (unsigned char *)MV_MixDestination;

	for (i = 0; i < length; i++) {
		int s = MV_cubic16(src, position, rate);
		int d = (*dest - 0x80) << 8;

		d += (MV_LeftVolume * s) / MV_MaxVolume;

		if (d < -32768) *dest = 0;
		else if (d > 32767) *dest = 255;
		else *dest = (d >> 8) + 128;
		
		position += rate;
		dest += MV_SampleSize;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;
}

void MV_Mix8BitStereo16( unsigned long position,
   unsigned long rate, const char *start, unsigned long length )
{
	const short *src;
	unsigned char *dest;
	unsigned int i;
	
	src = (const short *)start;
	dest = (unsigned char *)MV_MixDestination;
	
	for (i = 0; i < length; i++) {
		int s = MV_cubic16(src, position, rate);
		int dl = (dest[0] - 0x80) << 8;
		int dr = (dest[MV_RightChannelOffset/2] - 0x80) << 8;
		
		dl += (MV_LeftVolume * s) / MV_MaxVolume;
		dr += (MV_RightVolume * s) / MV_MaxVolume;

		if (dl < -32768) dest[0] = 0;
		else if (dl > 32767) dest[0] = 255;
		else dest[0] = (dl >> 8) + 128;

		if (dr < -32768) dest[MV_RightChannelOffset] = 0;
		else if (dr > 32767) dest[MV_RightChannelOffset] = 255;
		else dest[MV_RightChannelOffset] = (dl >> 8) + 128;
		
		position += rate;
		dest += MV_SampleSize;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;
}

void MV_Mix16BitMono16( unsigned long position,
   unsigned long rate, const char *start, unsigned long length )
{
	const short *src;
	short *dest;
	unsigned int i;
	
	src = (const short *)start;
	dest = (short *)MV_MixDestination;
	
	for (i = 0; i < length; i++) {
		int s = MV_cubic16(src, position, rate);
		int d = *dest;
		
		d += (MV_LeftVolume * s) / MV_MaxVolume;
		
		if (d < -32768) *dest = -32768;
		else if (d >  32767) *dest =  32767;
		else *dest = d;
		
		position += rate;
		dest += MV_SampleSize/2;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;
}

void MV_Mix16BitStereo16( unsigned long position,
   unsigned long rate, const char *start, unsigned long length )
{
	const short *src;
	short *dest;
	unsigned int i;

	src = (const short *)start;
	dest = (short *)MV_MixDestination;

	for (i = 0; i < length; i++) {
		int s = MV_cubic16(src, position, rate);
		int dl = dest[0];
		int dr = dest[MV_RightChannelOffset/2];

		dl += (MV_LeftVolume * s) / MV_MaxVolume;
		dr += (MV_RightVolume * s) / MV_MaxVolume;

		if (dl < -32768) dest[0] = -32768;
		else if (dl > 32767) dest[0] = 32767;
		else dest[0] = dl;

		if (dr < -32768) dest[MV_RightChannelOffset/2] = -32768;
		else if (dr > 32767) dest[MV_RightChannelOffset/2] = 32767;
		else dest[MV_RightChannelOffset/2] = dl;
		
		position += rate;
		dest += MV_SampleSize/2;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;
}

void MV_MixFPMono8( unsigned long position,
   unsigned long rate, const char *start, unsigned long length )
{
	const unsigned char *src;
	double *dest;
	unsigned int i;

	src = (const unsigned char *)start;
	dest = (double *)MV_MixDestination;

	for (i = 0; i < length; i++) {
		int s = MV_cubic8to16(src, position, rate);
		double out;
		
		out = (double)s * (double)MV_LeftVolume / (double)MV_MaxVolume;
		out = out / ((double)0x8000);
		*dest += out;

		position += rate;
		dest += MV_Channels;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;
}

void MV_MixFPStereo8( unsigned long position,
   unsigned long rate, const char *start, unsigned long length )
{
	const unsigned char *src;
	double *dest;
	unsigned int i;
	
	src = (const unsigned char *)start;
	dest = (double *)MV_MixDestination;

	for (i = 0; i < length; i++) {
		int s = MV_cubic8to16(src, position, rate);
		double left, right;
		
		left = (double)MV_LeftVolume * (double)s / (double)MV_MaxVolume;
		left = left / ((double)0x8000);
		right = (double)(MV_RightVolume * s) / MV_MaxVolume;
		right = right / ((double)0x8000);
		dest[0] += left;
		dest[1] += right;

		position += rate;
		dest += MV_Channels;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;

}

void MV_MixFPMono16( unsigned long position,
   unsigned long rate, const char *start, unsigned long length )
{
	const short *src;
	double *dest;
	unsigned int i;

	src = (const short *)start;
	dest = (double *)MV_MixDestination;

	for (i = 0; i < length; i++) {
		int s = MV_cubic16(src, position, rate);
		double out;
		
		out = (double)s * (double)MV_LeftVolume / (double)MV_MaxVolume;
		out = out / ((double)0x8000);
		*dest += out;

		position += rate;
		dest += MV_Channels;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;
}

void MV_MixFPStereo16( unsigned long position,
   unsigned long rate, const char *start, unsigned long length )
{
	const short *src;
	double *dest;
	unsigned int i;
	
	src = (const short *)start;
	dest = (double *)MV_MixDestination;

	for (i = 0; i < length; i++) {
		int s = MV_cubic16(src, position, rate);
		double left, right;
		
		left = (double)MV_LeftVolume * (double)s / (double)MV_MaxVolume;
		left = left / ((double)0x8000);
		right = (double)(MV_RightVolume * s) / MV_MaxVolume;
		right = right / ((double)0x8000);
		dest[0] += left;
		dest[1] += right;

		position += rate;
		dest += MV_Channels;
	}
	
	MV_MixPosition = position;
	MV_MixDestination = (char *)dest;

}