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/*
Framebuffer.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 "Framebuffer.h"
ArgumentType Framebuffer_getArgumentType(CSOUND *csound, MYFLT *argument);
void Framebuffer_checkArgumentSanity(CSOUND *csound, Framebuffer *self);
int32_t Framebuffer_initialise(CSOUND *csound, Framebuffer *self)
{
self->inputType = Framebuffer_getArgumentType(csound, self->inputArgument);
self->outputType = Framebuffer_getArgumentType(csound, self->outputArgument);
self->elementCount = *self->sizeArgument;
self->ksmps = csound->GetKsmps(csound);
Framebuffer_checkArgumentSanity(csound, self);
csound->AuxAlloc(csound, self->elementCount * sizeof(MYFLT),
&self->bufferMemory);
self->buffer = self->bufferMemory.auxp;
if (self->outputType == KRATE_ARRAY) {
ARRAYDAT *array = (ARRAYDAT *) self->outputArgument;
array->sizes = csound->Calloc(csound, sizeof(int32_t));
array->sizes[0] = self->elementCount;
array->dimensions = 1;
CS_VARIABLE *var = array->arrayType->createVariable(csound, NULL);
array->arrayMemberSize = var->memBlockSize;
array->data = csound->Calloc(csound,
var->memBlockSize * self->elementCount);
}
return OK;
}
void Framebuffer_writeBuffer(CSOUND *csound, Framebuffer *self,
MYFLT *inputSamples, int32_t inputSamplesCount)
{
IGN(csound);
if (self->writeIndex + inputSamplesCount <= self->elementCount) {
memcpy(&self->buffer[self->writeIndex], inputSamples,
sizeof(MYFLT) * inputSamplesCount);
self->writeIndex += self->ksmps;
self->writeIndex %= self->elementCount;
}
else {
int32_t firstHalf = self->elementCount - self->writeIndex;
memcpy(&self->buffer[self->writeIndex], inputSamples,
sizeof(MYFLT) * firstHalf);
int32_t secondHalf = inputSamplesCount - firstHalf;
memcpy(self->buffer, &inputSamples[firstHalf],
sizeof(MYFLT) * secondHalf);
self->writeIndex = secondHalf;
}
}
void Framebuffer_readBuffer(CSOUND *csound, Framebuffer *self,
MYFLT *outputSamples, int32_t outputSamplesCount)
{
IGN(csound);
if (self->writeIndex + outputSamplesCount < self->elementCount) {
memcpy(outputSamples, &self->buffer[self->writeIndex],
sizeof(MYFLT) * outputSamplesCount);
}
else {
int32_t firstHalf = self->elementCount - self->writeIndex;
memcpy(outputSamples, &self->buffer[self->writeIndex],
sizeof(MYFLT) * firstHalf);
int32_t secondHalf = outputSamplesCount - firstHalf;
memcpy(&outputSamples[firstHalf], self->buffer,
sizeof(MYFLT) * secondHalf);
}
}
void Framebuffer_processAudioInFrameOut(CSOUND *csound, Framebuffer *self)
{
Framebuffer_writeBuffer(csound, self, self->inputArgument, self->ksmps);
ARRAYDAT *array = (ARRAYDAT *)self->outputArgument;
Framebuffer_readBuffer(csound, self, array->data, array->sizes[0]);
}
void Framebuffer_processFrameInAudioOut(CSOUND *csound, Framebuffer *self)
{
ARRAYDAT *array = (ARRAYDAT *)self->inputArgument;
Framebuffer_writeBuffer(csound, self, array->data, array->sizes[0]);
Framebuffer_readBuffer(csound, self, self->outputArgument, self->ksmps);
}
int32_t Framebuffer_process(CSOUND *csound, Framebuffer *self)
{
if (self->inputType == KRATE_ARRAY) {
Framebuffer_processFrameInAudioOut(csound, self);
}
else if (self->inputType == ARATE_VAR) {
Framebuffer_processAudioInFrameOut(csound, self);
}
return OK;
}
void Framebuffer_checkArgumentSanity(CSOUND *csound, Framebuffer *self)
{
if (UNLIKELY((uint32_t)self->elementCount < csound->GetKsmps(csound))) {
csound->Die(csound, "%s", Str("framebuffer: Error, specified element "
"count less than ksmps value, Exiting"));
}
if (self->inputType == ARATE_VAR) {
if (UNLIKELY(self->outputType != KRATE_ARRAY)) {
csound->Die(csound, "%s", Str("framebuffer: Error, only k-rate arrays "
"allowed for a-rate var inputs, Exiting"));
}
}
else if (LIKELY(self->inputType == KRATE_ARRAY)) {
if (UNLIKELY(self->outputType != ARATE_VAR)) {
csound->Die(csound, "%s", Str("framebuffer: Error, only a-rate vars "
"allowed for k-rate array inputs, Exiting"));
}
ARRAYDAT *array = (ARRAYDAT *) self->inputArgument;
if (UNLIKELY(array->dimensions != 1)) {
csound->Die(csound, "%s", Str("framebuffer: Error, k-rate array input "
"must be one dimensional, Exiting"));
}
if (UNLIKELY(array->sizes[0] > self->elementCount)) {
csound->Die(csound, "%s", Str("framebuffer: Error, k-rate array input "
"element count must be less than\nor equal "
"to specified framebuffer size, Exiting"));
}
}
else {
csound->Die(csound,
"%s", Str("framebuffer: Error, only a-rate var input with k-rate "
"array output or k-rate\narray input with a-rate var "
"output are valid arguments, Exiting"));
}
}
ArgumentType Framebuffer_getArgumentType(CSOUND *csound, MYFLT *argument)
{
const CS_TYPE *csoundType = csound->GetTypeForArg((void *)argument);
const char *type = csoundType->varTypeName;
ArgumentType argumentType = UNKNOWN;
if (strcmp("S", type) == 0) {
argumentType = STRING_VAR;
}
else if (strcmp("a", type) == 0) {
argumentType = ARATE_VAR;
}
else if (strcmp("k", type) == 0) {
argumentType = KRATE_VAR;
}
else if (strcmp("i", type) == 0) {
argumentType = IRATE_VAR;
}
else if (strcmp("[", type) == 0) {
ARRAYDAT *array = (ARRAYDAT *)argument;
if (strcmp("k", array->arrayType->varTypeName) == 0) {
argumentType = KRATE_ARRAY;
}
else if (strcmp("a", array->arrayType->varTypeName) == 0) {
argumentType = ARATE_ARRAY;
}
else if (strcmp("i", array->arrayType->varTypeName) == 0) {
argumentType = IRATE_ARRAY;
}
}
return argumentType;
}
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