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/*
OLABuffer.c
Framebuffer
Created by Edward Costello on 10/06/2015.
Copyright (c) 2015 Edward Costello.
This file is part of Csound.
The Csound Library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Csound is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Csound; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "OLABuffer.h"
// As far as I can tell these includes are not needed -- JPff
#ifdef _MSC_VER
// FIXME including this "equivalent" file seems to cause a ton of errors
//#include <ctgmath>
#else
//#include <tgmath.h>
#endif
void OLABuffer_checkArgumentSanity(CSOUND *csound, OLABuffer *self);
int32_t OLABuffer_initialise(CSOUND *csound, OLABuffer *self)
{
OLABuffer_checkArgumentSanity(csound, self);
self->inputArray = (ARRAYDAT *)self->inputArgument;
self->frameSamplesCount = self->inputArray->sizes[0];
self->framesCount = *self->overlapArgument;
self->overlapSamplesCount = self->frameSamplesCount / self->framesCount;
csound->AuxAlloc(csound,
self->frameSamplesCount * self->framesCount * sizeof(MYFLT),
&self->frameSamplesMemory);
csound->AuxAlloc(csound, self->framesCount * sizeof(MYFLT *),
&self->framePointerMemory);
self->frames = self->framePointerMemory.auxp;
self->ksmps = csound->GetKsmps(csound);
int32_t i;
for (i = 0; i < self->framesCount; ++i) {
self->frames[i] =
&((MYFLT *)self->frameSamplesMemory.auxp)[i * self->frameSamplesCount];
}
self->overlapSampleIndex = self->overlapSamplesCount;
return OK;
}
void OLABuffer_writeFrame(OLABuffer *self, MYFLT *inputFrame, int32_t frameIndex)
{
int32_t firstHalfOffset = self->overlapSamplesCount * frameIndex;
int32_t firstHalfCount = self->frameSamplesCount - firstHalfOffset;
int32_t secondHalfCount = self->frameSamplesCount - firstHalfCount;
memcpy(&self->frames[frameIndex][firstHalfOffset], inputFrame,
firstHalfCount * sizeof(MYFLT));
memcpy(self->frames[frameIndex], &inputFrame[firstHalfCount],
secondHalfCount * sizeof(MYFLT));
}
void OLABuffer_readFrame(OLABuffer *self, MYFLT *outputFrame,
int32_t outputFrameOffset,
int32_t olaBufferOffset, int32_t samplesCount)
{
memcpy(&outputFrame[outputFrameOffset],
&self->frames[0][olaBufferOffset], samplesCount * sizeof(MYFLT));
int32_t i, j;
for (i = 1; i < self->framesCount; ++i) {
for (j = 0; j < samplesCount; ++j) {
outputFrame[j + outputFrameOffset] += self->frames[i][j + olaBufferOffset];
}
}
}
int32_t OLABuffer_process(CSOUND *csound, OLABuffer *self)
{
IGN(csound);
int32_t nextKPassSampleIndex =
(self->readSampleIndex + self->ksmps) % self->overlapSamplesCount;
if (nextKPassSampleIndex == 0) {
OLABuffer_writeFrame(self, self->inputArray->data, self->frameIndex);
OLABuffer_readFrame(self, self->outputArgument, 0,
self->readSampleIndex, self->ksmps);
self->frameIndex++;
self->frameIndex %= self->framesCount;
}
else if (nextKPassSampleIndex < self->overlapSampleIndex) {
int32_t firstHalfCount = self->overlapSamplesCount - self->overlapSampleIndex;
if (firstHalfCount != 0) {
OLABuffer_readFrame(self, self->outputArgument, 0,
self->readSampleIndex, firstHalfCount);
}
OLABuffer_writeFrame(self, self->inputArray->data, self->frameIndex);
int32_t secondHalfCount = self->ksmps - firstHalfCount;
if (secondHalfCount != 0) {
OLABuffer_readFrame(self, self->outputArgument, firstHalfCount,
self->readSampleIndex, secondHalfCount);
}
self->frameIndex++;
self->frameIndex %= self->framesCount;
}
else {
OLABuffer_readFrame(self, self->outputArgument, 0,
self->readSampleIndex, self->ksmps);
}
self->overlapSampleIndex += self->ksmps;
self->overlapSampleIndex %= self->overlapSamplesCount;
self->readSampleIndex += self->ksmps;
self->readSampleIndex %= self->frameSamplesCount;
return OK;
}
void OLABuffer_checkArgumentSanity(CSOUND *csound, OLABuffer *self)
{
MYFLT overlapCount = *self->overlapArgument;
if (UNLIKELY(floor(overlapCount) != overlapCount)) {
csound->Die(csound,
"%s", Str("olabuffer: Error, overlap factor must be an integer"));
}
ARRAYDAT *array = (ARRAYDAT *) self->inputArgument;
if (UNLIKELY(array->dimensions != 1)) {
csound->Die(csound, "%s",
Str("olabuffer: Error, k-rate array must be one dimensional"));
}
int32_t frameSampleCount = array->sizes[0];
if (UNLIKELY(frameSampleCount <= (int32_t)overlapCount)) {
csound->Die(csound,
"%s", Str("olabuffer: Error, k-rate array size must be "
"larger than ovelap factor"));
}
if (UNLIKELY(frameSampleCount % (int32_t)overlapCount != 0)) {
csound->Die(csound, "%s", Str("olabuffer: Error, overlap factor must be "
"an integer multiple of k-rate array size"));
}
if (UNLIKELY(frameSampleCount / (int32_t)overlapCount <
(int32_t) csound->GetKsmps(csound))) {
csound->Die(csound, "%s", Str("olabuffer: Error, k-rate array size divided "
"by overlap factor must be larger than or equal "
"to ksmps"));
}
}
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