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#ifndef MIXER_HRTFBASE_H
#define MIXER_HRTFBASE_H
#include <algorithm>
#include "alu.h"
#include "../hrtf.h"
#include "opthelpers.h"
#include "voice.h"
using ApplyCoeffsT = void(&)(float2 *RESTRICT Values, const ALuint irSize, const HrirArray &Coeffs,
const float left, const float right);
template<ApplyCoeffsT ApplyCoeffs>
inline void MixHrtfBase(const float *InSamples, float2 *RESTRICT AccumSamples, const ALuint IrSize,
MixHrtfFilter *hrtfparams, const size_t BufferSize)
{
ASSUME(BufferSize > 0);
const HrirArray &Coeffs = *hrtfparams->Coeffs;
const float gainstep{hrtfparams->GainStep};
const float gain{hrtfparams->Gain};
ALsizei Delay[2]{
HRTF_HISTORY_LENGTH - hrtfparams->Delay[0],
HRTF_HISTORY_LENGTH - hrtfparams->Delay[1] };
ASSUME(Delay[0] >= 0 && Delay[1] >= 0);
float stepcount{0.0f};
for(size_t i{0u};i < BufferSize;++i)
{
const float g{gain + gainstep*stepcount};
const float left{InSamples[Delay[0]++] * g};
const float right{InSamples[Delay[1]++] * g};
ApplyCoeffs(AccumSamples+i, IrSize, Coeffs, left, right);
stepcount += 1.0f;
}
hrtfparams->Gain = gain + gainstep*stepcount;
}
template<ApplyCoeffsT ApplyCoeffs>
inline void MixHrtfBlendBase(const float *InSamples, float2 *RESTRICT AccumSamples,
const ALuint IrSize, const HrtfFilter *oldparams, MixHrtfFilter *newparams,
const size_t BufferSize)
{
const auto &OldCoeffs = oldparams->Coeffs;
const float oldGain{oldparams->Gain};
const float oldGainStep{-oldGain / static_cast<float>(BufferSize)};
const auto &NewCoeffs = *newparams->Coeffs;
const float newGainStep{newparams->GainStep};
ASSUME(BufferSize > 0);
ALsizei Delay[2]{
HRTF_HISTORY_LENGTH - oldparams->Delay[0],
HRTF_HISTORY_LENGTH - oldparams->Delay[1] };
ASSUME(Delay[0] >= 0 && Delay[1] >= 0);
float stepcount{0.0f};
for(size_t i{0u};i < BufferSize;++i)
{
const float g{oldGain + oldGainStep*stepcount};
const float left{InSamples[Delay[0]++] * g};
const float right{InSamples[Delay[1]++] * g};
ApplyCoeffs(AccumSamples+i, IrSize, OldCoeffs, left, right);
stepcount += 1.0f;
}
Delay[0] = HRTF_HISTORY_LENGTH - newparams->Delay[0];
Delay[1] = HRTF_HISTORY_LENGTH - newparams->Delay[1];
ASSUME(Delay[0] >= 0 && Delay[1] >= 0);
stepcount = 0.0f;
for(size_t i{0u};i < BufferSize;++i)
{
const float g{newGainStep*stepcount};
const float left{InSamples[Delay[0]++] * g};
const float right{InSamples[Delay[1]++] * g};
ApplyCoeffs(AccumSamples+i, IrSize, NewCoeffs, left, right);
stepcount += 1.0f;
}
newparams->Gain = newGainStep*stepcount;
}
template<ApplyCoeffsT ApplyCoeffs>
inline void MixDirectHrtfBase(FloatBufferLine &LeftOut, FloatBufferLine &RightOut,
const al::span<const FloatBufferLine> InSamples, float2 *RESTRICT AccumSamples,
DirectHrtfState *State, const size_t BufferSize)
{
ASSUME(BufferSize > 0);
const ALuint IrSize{State->IrSize};
auto coeff_iter = State->Coeffs.begin();
for(const FloatBufferLine &input : InSamples)
{
const auto &Coeffs = *(coeff_iter++);
for(size_t i{0u};i < BufferSize;++i)
{
const float insample{input[i]};
ApplyCoeffs(AccumSamples+i, IrSize, Coeffs, insample, insample);
}
}
for(size_t i{0u};i < BufferSize;++i)
LeftOut[i] += AccumSamples[i][0];
for(size_t i{0u};i < BufferSize;++i)
RightOut[i] += AccumSamples[i][1];
/* Copy the new in-progress accumulation values to the front and clear the
* following samples for the next mix.
*/
auto accum_iter = std::copy_n(AccumSamples+BufferSize, HRIR_LENGTH, AccumSamples);
std::fill_n(accum_iter, BufferSize, float2{});
}
#endif /* MIXER_HRTFBASE_H */
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