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#include "c_crossfader.h"
C_CROSSFADER::C_CROSSFADER(int length, int nCh, int sRate) : C_DATAPUMP<short>(length * 1 * 1) { // in milliseconds
BufferLength = 0;
srate = sRate;
nch = nCh;
crossfade = 0;
mode = 0;
SetBufferLength(length);
}
C_CROSSFADER::~C_CROSSFADER() {
C_DATAPUMP<short>::~C_DATAPUMP();
}
// protected interfaces
void C_CROSSFADER::SampleRateConvert(int newsrate) { // in samples per second // this needs work
srate = newsrate;
SetBufferLength(BufferLength);
/*
if (BufferBottom && BufferTop) {
int newsratestep = srate != 0 ? newsrate / srate : 0;
int oldsratestep = newsrate != 0 ? srate / newsrate : 0;
if (newsratestep && oldsratestep) {
int newbuflength = (BufferLength * newsrate) / srate;
int newbufsize = (newbuflength * nch * srate * sizeof(short)) / 1000;
short *newbuf = (short *)malloc(newbufsize);
short *newbufptr = newbuf;
short *endbufptr = newbufptr+(newbufsize/sizeof(short));
short *oldbufptr = BufferBottom;
do {
for(int i = 0; i < newsratestep; i++, newbufptr+=nch) {
if (newbufptr >= endbufptr) break;
*newbufptr = *oldbufptr;
if (nch == 2) *(newbufptr+1) = *(oldbufptr+1);
}
oldbufptr += oldsratestep * nch;
} while(newbufptr < endbufptr);
free(BufferBottom);
BufferLength = newbuflength;
BufferBottom = newbuf;
BufferTop = endbufptr;
BufferStart = BufferEnd = BufferBottom;
}
}
*/
}
void C_CROSSFADER::ChannelConvert(int newnch) { // this needs work
nch = newnch;
SetBufferLength(BufferLength);
/*
if (BufferBottom && BufferTop) {
int newbuflength = (BufferLength * newnch) / nch;
int newbufsize = (newbuflength * nch * srate * sizeof(short)) / 1000;
short *newbuf = (short *)malloc(newbufsize);
short *newbufptr = newbuf;
short *endbufptr = newbufptr+(newbufsize/sizeof(short));
short *oldbufptr = BufferBottom;
for(; newbufptr < endbufptr; newbufptr+=newnch, oldbufptr+=nch) {
if (newnch == 1) *newbufptr = (*oldbufptr + *(oldbufptr+1)) >> 1;
else *(newbufptr+1) = *newbufptr = *oldbufptr;
}
free(BufferBottom);
BufferLength = newbuflength;
BufferBottom = newbuf;
BufferTop = endbufptr;
BufferStart = BufferEnd = BufferBottom;
}
*/
}
// human interfaces
void C_CROSSFADER::SetSampleRate(int sRate) { // in samples per second
if (sRate != srate) {
if (srate && sRate) SampleRateConvert(sRate);
}
if (sRate) srate = sRate;
}
void C_CROSSFADER::SetChannels(int nCh) {
if (nCh != nch) {
if (nch && nCh) ChannelConvert(nCh);
}
if (nCh) nch = nCh;
}
void C_CROSSFADER::SetBufferLength(int bufferLength) { // in milliseconds
BufferLength = bufferLength;
resizeBuffer((BufferLength * srate * nch) / 1000);
}
void C_CROSSFADER::SetCrossfading(int onoff) {
if (crossfade == 0) {
crossfade = onoff ? 1 : 0;
if (onoff) BufferEnd = BufferStart;
}
}
void C_CROSSFADER::SetCrossfadeMode(int Mode) {
mode = Mode;
}
void C_CROSSFADER::addItems(short *inputBuffer, size_t inputSize) {
if (inputBuffer && inputSize) {
size_t numsamps = inputSize*nch;
if (crossfade==0) {
memcpy(BufferEnd,inputBuffer,numsamps*sizeof(short)); // copy our records in
BufferEnd += numsamps;
} else { // do our crappy crossfade
short *smpptr = inputBuffer;
size_t bufsamps = (BufferTop-BufferBottom)/nch;
size_t bufpos = (BufferEnd >= BufferStart ? BufferEnd-BufferStart : (BufferEnd-BufferBottom)+(BufferTop-BufferStart)) / nch;
size_t dist = ((BufferTop - BufferBottom) / nch) - bufpos;
for(size_t i = 0; i != numsamps; i++) {
if (BufferEnd >= BufferTop) BufferEnd = BufferBottom + (BufferEnd-BufferTop);
if (mode == 0) { // X-style (techno mix-style)
*BufferEnd = (short)(((((double)*BufferEnd++)*dist) + (((double)*smpptr++)*bufpos)) / bufsamps);
if (nch==1 || i&1) { // every-other I or always when mono.
bufpos++;
dist--;
}
} else if (mode == 1) { // h-style (rock radio station-style)
*BufferEnd = (short)(((((double)*BufferEnd++)*dist) + ((double)*smpptr++)) / bufsamps);
if (nch==1 || i&1) dist--; // every-other I or always when mono.
}
}
if (dist < inputSize) crossfade = 0;
}
if (BufferEnd >= BufferTop) BufferEnd = BufferBottom + (BufferEnd-BufferTop);
}
}
size_t C_CROSSFADER::put(short *inputBuffer, size_t inputSize) { // in channel-less shorts
// returns number of <T> records added to logical buffer
size_t retval = 0;
if (inputBuffer && inputSize) {
size_t fitting = (((BufferTop-BufferBottom)-1) - size()) / nch; // can't go over our logical boundary.... blah
if (fitting > inputSize) fitting = inputSize; // the entire thing can fit. yeay!
retval = fitting;
if (fitting > 0) {
short *bufptr = inputBuffer;
size_t top = (BufferEnd >= BufferStart ? BufferTop-BufferEnd : 0) / nch; // number of <T> records free at top of physical buffer
size_t bottom = (BufferEnd >= BufferStart ? BufferStart-BufferBottom : (BufferStart-BufferEnd)) / nch; // number of <T> records free at bottom of physical buffer
if (top > 0) {
if (top > fitting) top = fitting;
addItems(bufptr,top);
fitting -= top;
bufptr += top*nch;
}
if (bottom > 0 && fitting > 0) {
if (bottom > fitting) bottom = fitting;
addItems(bufptr,bottom);
}
}
}
return retval;
}
size_t C_CROSSFADER::get(short *outputBuffer, size_t outputSize, int nCh) { // in channel-less shorts
// returns number of <T> records pulled from the logical buffer
size_t retval = 0;
nch = nCh;
if (outputBuffer && outputSize) {
size_t fitting = size() / nch;
if (fitting > outputSize) fitting = outputSize;
retval = fitting;
if (fitting > 0) {
short *bufptr = outputBuffer;
size_t top = (BufferEnd >= BufferStart ? BufferEnd-BufferStart : BufferTop-BufferStart) / nch; // number of <T> records at top of physical buffer
size_t bottom = (BufferEnd >= BufferStart ? 0 : BufferEnd-BufferBottom) / nch; // number of <T> records at bottom of physical buffer
if (top > 0) {
if (top > fitting) top = fitting;
getItems(bufptr,top*nch);
delItems(0,top*nch);
fitting -= top;
bufptr += top*nch;
}
if (bottom > 0 && fitting > 0) {
if (bottom > fitting) bottom = fitting;
getItems(bufptr,bottom*nch);
delItems(0,bottom*nch);
}
}
}
return retval;
}
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