cog/Audio/ThirdParty/r8bstate.h

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//
// r8bstate.h
// CogAudio Framework
//
// Created by Christopher Snowhill on 3/3/22.
//
#ifndef r8bstate_h
#define r8bstate_h
#include <Accelerate/Accelerate.h>
#include "r8bbase.h"
#include "CDSPResampler.h"
struct r8bstate {
int channelCount;
int bufferCapacity;
size_t remainder;
uint64_t inProcessed;
uint64_t outProcessed;
double sampleRatio;
r8b::CFixedBuffer<double> InBuf;
r8b::CFixedBuffer<double> *OutBufs;
r8b::CDSPResampler24 **Resamps;
r8bstate(int _channelCount, int _bufferCapacity, double srcRate, double dstRate)
: channelCount(_channelCount), bufferCapacity(_bufferCapacity), inProcessed(0), outProcessed(0), remainder(0) {
InBuf.alloc(bufferCapacity);
OutBufs = new r8b::CFixedBuffer<double>[channelCount];
Resamps = new r8b::CDSPResampler24 *[channelCount];
for(int i = 0; i < channelCount; ++i) {
Resamps[i] = new r8b::CDSPResampler24(srcRate, dstRate, bufferCapacity);
}
sampleRatio = dstRate / srcRate;
}
~r8bstate() {
delete[] OutBufs;
for(int i = 0; i < channelCount; ++i) {
delete Resamps[i];
}
delete[] Resamps;
}
double latency() {
return ((double)inProcessed * sampleRatio) - (double)outProcessed;
}
int resample(const float *input, size_t inCount, size_t *inDone, float *output, size_t outMax) {
int ret = 0;
int i;
if(inDone) *inDone = 0;
while(remainder > 0) {
size_t blockCount = remainder;
if(blockCount > outMax)
blockCount = outMax;
for(i = 0; i < channelCount; ++i) {
vDSP_vdpsp(&OutBufs[i][0], 1, output + i, channelCount, blockCount);
}
remainder -= blockCount;
if(remainder > 0) {
for(i = 0; i < channelCount; ++i) {
memmove(&OutBufs[i][0], &OutBufs[i][blockCount], remainder * sizeof(double));
}
}
output += channelCount * blockCount;
outProcessed += blockCount;
outMax -= blockCount;
ret += blockCount;
if(!outMax)
return ret;
}
while(inCount > 0) {
size_t blockCount = inCount;
if(blockCount > bufferCapacity)
blockCount = bufferCapacity;
int outputDone = 0;
for(i = 0; i < channelCount; ++i) {
double *outputPointer;
vDSP_vspdp(input + i, channelCount, &InBuf[0], 1, blockCount);
outputDone = Resamps[i]->process(InBuf, (int)blockCount, outputPointer);
if(outputDone) {
if(outputDone > outMax) {
vDSP_vdpsp(outputPointer, 1, output + i, channelCount, outMax);
remainder = outputDone - outMax;
OutBufs[i].alloc((int)remainder);
memcpy(&OutBufs[i][0], outputPointer + outMax, remainder);
} else {
vDSP_vdpsp(outputPointer, 1, output + i, channelCount, outputDone);
}
}
}
size_t outputActual = outputDone - remainder;
input += channelCount * blockCount;
output += channelCount * outputActual;
inCount -= blockCount;
if(inDone) *inDone += blockCount;
inProcessed += blockCount;
outProcessed += outputActual;
outMax -= outputActual;
ret += outputActual;
if(remainder)
break;
}
return ret;
}
int flush(float *output, size_t outMax) {
int ret = 0;
int i;
if(remainder > 0) {
size_t blockCount = remainder;
if(blockCount > outMax)
blockCount = outMax;
for(i = 0; i < channelCount; ++i) {
vDSP_vdpsp(&OutBufs[i][0], 1, output + i, channelCount, blockCount);
}
remainder -= blockCount;
if(remainder > 0) {
for(i = 0; i < channelCount; ++i) {
memmove(&OutBufs[i][0], &OutBufs[i][blockCount], remainder * sizeof(double));
}
}
output += channelCount * blockCount;
outProcessed += blockCount;
outMax -= blockCount;
ret += blockCount;
if(!outMax)
return ret;
}
uint64_t outputWanted = ceil(inProcessed * sampleRatio);
memset(&InBuf[0], 0, sizeof(double) * bufferCapacity);
while(outProcessed < outputWanted) {
int outputDone = 0;
for(int i = 0; i < channelCount; ++i) {
double *outputPointer;
outputDone = Resamps[i]->process(InBuf, bufferCapacity, outputPointer);
if(outputDone) {
if(outputDone > (outputWanted - outProcessed))
outputDone = (int)(outputWanted - outProcessed);
if(outputDone > outMax) {
vDSP_vdpsp(outputPointer, 1, output + i, channelCount, outMax);
remainder = outputDone - outMax;
OutBufs[i].alloc((int)remainder);
memcpy(&OutBufs[i][0], outputPointer + outMax, remainder);
} else {
vDSP_vdpsp(outputPointer, 1, output + i, channelCount, outputDone);
}
}
}
size_t outputActual = outputDone - remainder;
outProcessed += outputActual;
output += channelCount * outputActual;
outMax -= outputActual;
ret += outputActual;
if(remainder)
break;
}
return ret;
}
};
#endif /* r8bstate_h */