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#ifndef CORE_MIXER_HRTFBASE_H
#define CORE_MIXER_HRTFBASE_H
#include <algorithm>
#include <cmath>
#include "almalloc.h"
#include "hrtfdefs.h"
#include "opthelpers.h"
using uint = unsigned int;
using ApplyCoeffsT = void(&)(float2 *RESTRICT Values, const size_t irSize,
const ConstHrirSpan Coeffs, const float left, const float right);
template<ApplyCoeffsT ApplyCoeffs>
inline void MixHrtfBase(const float *InSamples, float2 *RESTRICT AccumSamples, const size_t IrSize,
const MixHrtfFilter *hrtfparams, const size_t BufferSize)
{
ASSUME(BufferSize > 0);
const ConstHrirSpan Coeffs{hrtfparams->Coeffs};
const float gainstep{hrtfparams->GainStep};
const float gain{hrtfparams->Gain};
size_t ldelay{HrtfHistoryLength - hrtfparams->Delay[0]};
size_t rdelay{HrtfHistoryLength - hrtfparams->Delay[1]};
float stepcount{0.0f};
for(size_t i{0u};i < BufferSize;++i)
{
const float g{gain + gainstep*stepcount};
const float left{InSamples[ldelay++] * g};
const float right{InSamples[rdelay++] * g};
ApplyCoeffs(AccumSamples+i, IrSize, Coeffs, left, right);
stepcount += 1.0f;
}
}
template<ApplyCoeffsT ApplyCoeffs>
inline void MixHrtfBlendBase(const float *InSamples, float2 *RESTRICT AccumSamples,
const size_t IrSize, const HrtfFilter *oldparams, const MixHrtfFilter *newparams,
const size_t BufferSize)
{
ASSUME(BufferSize > 0);
const ConstHrirSpan OldCoeffs{oldparams->Coeffs};
const float oldGainStep{oldparams->Gain / static_cast<float>(BufferSize)};
const ConstHrirSpan NewCoeffs{newparams->Coeffs};
const float newGainStep{newparams->GainStep};
if LIKELY(oldparams->Gain > GainSilenceThreshold)
{
size_t ldelay{HrtfHistoryLength - oldparams->Delay[0]};
size_t rdelay{HrtfHistoryLength - oldparams->Delay[1]};
auto stepcount = static_cast<float>(BufferSize);
for(size_t i{0u};i < BufferSize;++i)
{
const float g{oldGainStep*stepcount};
const float left{InSamples[ldelay++] * g};
const float right{InSamples[rdelay++] * g};
ApplyCoeffs(AccumSamples+i, IrSize, OldCoeffs, left, right);
stepcount -= 1.0f;
}
}
if LIKELY(newGainStep*static_cast<float>(BufferSize) > GainSilenceThreshold)
{
size_t ldelay{HrtfHistoryLength+1 - newparams->Delay[0]};
size_t rdelay{HrtfHistoryLength+1 - newparams->Delay[1]};
float stepcount{1.0f};
for(size_t i{1u};i < BufferSize;++i)
{
const float g{newGainStep*stepcount};
const float left{InSamples[ldelay++] * g};
const float right{InSamples[rdelay++] * g};
ApplyCoeffs(AccumSamples+i, IrSize, NewCoeffs, left, right);
stepcount += 1.0f;
}
}
}
template<ApplyCoeffsT ApplyCoeffs>
inline void MixDirectHrtfBase(const FloatBufferSpan LeftOut, const FloatBufferSpan RightOut,
const al::span<const FloatBufferLine> InSamples, float2 *RESTRICT AccumSamples,
float *TempBuf, HrtfChannelState *ChanState, const size_t IrSize, const size_t BufferSize)
{
ASSUME(BufferSize > 0);
for(const FloatBufferLine &input : InSamples)
{
/* For dual-band processing, the signal needs extra scaling applied to
* the high frequency response. The band-splitter applies this scaling
* with a consistent phase shift regardless of the scale amount.
*/
ChanState->mSplitter.processHfScale({input.data(), BufferSize}, TempBuf,
ChanState->mHfScale);
/* Now apply the HRIR coefficients to this channel. */
const float *RESTRICT tempbuf{al::assume_aligned<16>(TempBuf)};
const ConstHrirSpan Coeffs{ChanState->mCoeffs};
for(size_t i{0u};i < BufferSize;++i)
{
const float insample{tempbuf[i]};
ApplyCoeffs(AccumSamples+i, IrSize, Coeffs, insample, insample);
}
++ChanState;
}
/* Add the HRTF signal to the existing "direct" signal. */
float *RESTRICT left{al::assume_aligned<16>(LeftOut.data())};
float *RESTRICT right{al::assume_aligned<16>(RightOut.data())};
for(size_t i{0u};i < BufferSize;++i)
left[i] += AccumSamples[i][0];
for(size_t i{0u};i < BufferSize;++i)
right[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, HrirLength, AccumSamples);
std::fill_n(accum_iter, BufferSize, float2{});
}
#endif /* CORE_MIXER_HRTFBASE_H */
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