ref: e029357a195263d878999872a558ff40b02c469b
dir: /src/audiolib/mv_mix.c/
#include "multivoc.h"
extern char *MV_MixDestination;
extern unsigned long MV_MixPosition;
extern char *MV_LeftVolume;
extern char *MV_RightVolume;
extern unsigned char *MV_HarshClipTable;
extern int MV_RightChannelOffset;
extern int MV_SampleSize;
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 = src[position >> 16];
int d = *dest;
s = MV_LeftVolume[s * 2];
s += d;
s = MV_HarshClipTable[s + 0x80];
*dest = (s & 0xff);
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 = src[(position >> 16)];
int dl = dest[0];
int dr = dest[MV_RightChannelOffset];
dl += MV_LeftVolume[s * 2];
dr += MV_RightVolume[s * 2];
dl = MV_HarshClipTable[dl + 0x80];
dr = MV_HarshClipTable[dr + 0x80];
dest[0] = (dl & 0xff);
dest[MV_RightChannelOffset] = (dr & 0xff);
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 short *MV_LeftVolumeS;
const unsigned char *src;
short *dest;
unsigned int i;
src = (const unsigned char *)start;
dest = (short *)MV_MixDestination;
MV_LeftVolumeS = (const short *)MV_LeftVolume;
for (i = 0; i < length; i++) {
int s = src[position >> 16];
int d = dest[0];
s = MV_LeftVolumeS[s];
s += d;
if (s < -32768) s = -32768;
if (s > 32767) s = 32767;
*dest = (short) s;
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 short *MV_LeftVolumeS;
const short *MV_RightVolumeS;
const unsigned char *src;
short *dest;
unsigned int i;
src = (unsigned char *)start;
dest = (short *)MV_MixDestination;
MV_LeftVolumeS = (const short *)MV_LeftVolume;
MV_RightVolumeS = (const short *)MV_RightVolume;
for (i = 0; i < length; i++) {
int s = src[position >> 16];
int dl = dest[0];
int dr = dest[MV_RightChannelOffset/2];
dl += MV_LeftVolumeS[s];
dr += MV_RightVolumeS[s];
if (dl < -32768) dl = -32768;
if (dl > 32767) dl = 32767;
if (dr < -32768) dr = -32768;
if (dr > 32767) dr = 32767;
dest[0] = (short) dl;
dest[MV_RightChannelOffset/2] = (short) 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 char *src;
unsigned char *dest;
unsigned int i;
src = (const char *)start + 1;
dest = (unsigned char *)MV_MixDestination;
for (i = 0; i < length; i++) {
int s = (int)src[(position >> 16) * 2] + 0x80;
int d = *dest;
s = MV_LeftVolume[s * 2];
s += d;
s = MV_HarshClipTable[s + 0x80];
*dest = (s & 0xff);
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 char *src;
unsigned char *dest;
unsigned int i;
src = (const char *)start + 1;
dest = (unsigned char *)MV_MixDestination;
for (i = 0; i < length; i++) {
int s = src[(position >> 16) * 2] + 0x80;
int dl = dest[0];
int dr = dest[MV_RightChannelOffset];
dl += MV_LeftVolume[s * 2];
dr += MV_RightVolume[s * 2];
dl = MV_HarshClipTable[dl + 0x80];
dr = MV_HarshClipTable[dr + 0x80];
dest[0] = (dl & 0xff);
dest[MV_RightChannelOffset] = (dr & 0xff);
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 *MV_LeftVolumeS;
const unsigned char *src;
short *dest;
unsigned int i;
src = (const unsigned char *)start;
dest = (short *)MV_MixDestination;
MV_LeftVolumeS = (const short *)MV_LeftVolume;
for (i = 0; i < length; i++) {
int sl = src[(position >> 16) * 2 + 0];
int sh = src[(position >> 16) * 2 + 1] ^ 0x80;
int d = *dest;
sl = MV_LeftVolume[sl * 2 + 1];
sh = MV_LeftVolumeS[sh];
d = sl + sh + 0x80 + d;
if (d < -32768) d = -32768;
if (d > 32767) d = 32767;
*dest = (short) 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 *MV_LeftVolumeS;
const short *MV_RightVolumeS;
const unsigned char *src;
short *dest;
unsigned int i;
src = (const unsigned char *)start;
dest = (short *)MV_MixDestination;
MV_LeftVolumeS = (const short *)MV_LeftVolume;
MV_RightVolumeS = (const short *)MV_RightVolume;
for (i = 0; i < length; i++) {
int sl = src[(position >> 16) * 2 + 0];
int sh = src[(position >> 16) * 2 + 1] ^ 0x80;
int dl = dest[0];
int dr = dest[MV_RightChannelOffset/2];
int sll = MV_LeftVolume[sl * 2 + 1];
int slh = MV_LeftVolumeS[sh];
int srl = MV_RightVolume[sl * 2 + 1];
int srh = MV_RightVolumeS[sh];
dl = sll + slh + 0x80 + dl;
dr = srl + srh + 0x80 + dr;
if (dl < -32768) dl = -32768;
if (dl > 32767) dl = 32767;
if (dr < -32768) dr = -32768;
if (dr > 32767) dr = 32767;
dest[0] = (short) dl;
dest[MV_RightChannelOffset/2] = (short) dr;
position += rate;
dest += MV_SampleSize/2;
}
MV_MixPosition = position;
MV_MixDestination = (char *)dest;
}