🛠️🐜 Antkeeper superbuild with dependencies included
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200 lines
6.7 KiB
200 lines
6.7 KiB
#include "config.h"
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#include <cassert>
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#include <cmath>
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#include <limits>
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#include "alnumeric.h"
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#include "core/bsinc_tables.h"
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#include "defs.h"
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#include "hrtfbase.h"
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struct CTag;
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struct CopyTag;
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struct PointTag;
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struct LerpTag;
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struct CubicTag;
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struct BSincTag;
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struct FastBSincTag;
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namespace {
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constexpr uint FracPhaseBitDiff{MixerFracBits - BSincPhaseBits};
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constexpr uint FracPhaseDiffOne{1 << FracPhaseBitDiff};
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inline float do_point(const InterpState&, const float *RESTRICT vals, const uint)
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{ return vals[0]; }
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inline float do_lerp(const InterpState&, const float *RESTRICT vals, const uint frac)
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{ return lerpf(vals[0], vals[1], static_cast<float>(frac)*(1.0f/MixerFracOne)); }
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inline float do_cubic(const InterpState&, const float *RESTRICT vals, const uint frac)
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{ return cubic(vals[0], vals[1], vals[2], vals[3], static_cast<float>(frac)*(1.0f/MixerFracOne)); }
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inline float do_bsinc(const InterpState &istate, const float *RESTRICT vals, const uint frac)
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{
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const size_t m{istate.bsinc.m};
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ASSUME(m > 0);
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// Calculate the phase index and factor.
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const uint pi{frac >> FracPhaseBitDiff};
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const float pf{static_cast<float>(frac & (FracPhaseDiffOne-1)) * (1.0f/FracPhaseDiffOne)};
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const float *RESTRICT fil{istate.bsinc.filter + m*pi*2};
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const float *RESTRICT phd{fil + m};
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const float *RESTRICT scd{fil + BSincPhaseCount*2*m};
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const float *RESTRICT spd{scd + m};
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// Apply the scale and phase interpolated filter.
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float r{0.0f};
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for(size_t j_f{0};j_f < m;j_f++)
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r += (fil[j_f] + istate.bsinc.sf*scd[j_f] + pf*(phd[j_f] + istate.bsinc.sf*spd[j_f])) * vals[j_f];
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return r;
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}
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inline float do_fastbsinc(const InterpState &istate, const float *RESTRICT vals, const uint frac)
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{
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const size_t m{istate.bsinc.m};
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ASSUME(m > 0);
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// Calculate the phase index and factor.
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const uint pi{frac >> FracPhaseBitDiff};
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const float pf{static_cast<float>(frac & (FracPhaseDiffOne-1)) * (1.0f/FracPhaseDiffOne)};
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const float *RESTRICT fil{istate.bsinc.filter + m*pi*2};
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const float *RESTRICT phd{fil + m};
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// Apply the phase interpolated filter.
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float r{0.0f};
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for(size_t j_f{0};j_f < m;j_f++)
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r += (fil[j_f] + pf*phd[j_f]) * vals[j_f];
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return r;
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}
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using SamplerT = float(&)(const InterpState&, const float*RESTRICT, const uint);
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template<SamplerT Sampler>
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float *DoResample(const InterpState *state, float *RESTRICT src, uint frac, uint increment,
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const al::span<float> dst)
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{
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const InterpState istate{*state};
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for(float &out : dst)
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{
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out = Sampler(istate, src, frac);
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frac += increment;
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src += frac>>MixerFracBits;
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frac &= MixerFracMask;
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}
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return dst.data();
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}
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inline void ApplyCoeffs(float2 *RESTRICT Values, const size_t IrSize, const ConstHrirSpan Coeffs,
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const float left, const float right)
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{
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ASSUME(IrSize >= MinIrLength);
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for(size_t c{0};c < IrSize;++c)
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{
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Values[c][0] += Coeffs[c][0] * left;
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Values[c][1] += Coeffs[c][1] * right;
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}
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}
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} // namespace
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template<>
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float *Resample_<CopyTag,CTag>(const InterpState*, float *RESTRICT src, uint, uint,
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const al::span<float> dst)
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{
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#if defined(HAVE_SSE) || defined(HAVE_NEON)
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/* Avoid copying the source data if it's aligned like the destination. */
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if((reinterpret_cast<intptr_t>(src)&15) == (reinterpret_cast<intptr_t>(dst.data())&15))
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return src;
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#endif
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std::copy_n(src, dst.size(), dst.begin());
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return dst.data();
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}
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template<>
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float *Resample_<PointTag,CTag>(const InterpState *state, float *RESTRICT src, uint frac,
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uint increment, const al::span<float> dst)
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{ return DoResample<do_point>(state, src, frac, increment, dst); }
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template<>
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float *Resample_<LerpTag,CTag>(const InterpState *state, float *RESTRICT src, uint frac,
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uint increment, const al::span<float> dst)
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{ return DoResample<do_lerp>(state, src, frac, increment, dst); }
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template<>
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float *Resample_<CubicTag,CTag>(const InterpState *state, float *RESTRICT src, uint frac,
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uint increment, const al::span<float> dst)
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{ return DoResample<do_cubic>(state, src-1, frac, increment, dst); }
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template<>
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float *Resample_<BSincTag,CTag>(const InterpState *state, float *RESTRICT src, uint frac,
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uint increment, const al::span<float> dst)
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{ return DoResample<do_bsinc>(state, src-state->bsinc.l, frac, increment, dst); }
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template<>
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float *Resample_<FastBSincTag,CTag>(const InterpState *state, float *RESTRICT src, uint frac,
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uint increment, const al::span<float> dst)
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{ return DoResample<do_fastbsinc>(state, src-state->bsinc.l, frac, increment, dst); }
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template<>
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void MixHrtf_<CTag>(const float *InSamples, float2 *AccumSamples, const uint IrSize,
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const MixHrtfFilter *hrtfparams, const size_t BufferSize)
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{ MixHrtfBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, hrtfparams, BufferSize); }
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template<>
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void MixHrtfBlend_<CTag>(const float *InSamples, float2 *AccumSamples, const uint IrSize,
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const HrtfFilter *oldparams, const MixHrtfFilter *newparams, const size_t BufferSize)
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{
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MixHrtfBlendBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, oldparams, newparams,
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BufferSize);
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}
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template<>
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void MixDirectHrtf_<CTag>(const FloatBufferSpan LeftOut, const FloatBufferSpan RightOut,
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const al::span<const FloatBufferLine> InSamples, float2 *AccumSamples,
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float *TempBuf, HrtfChannelState *ChanState, const size_t IrSize, const size_t BufferSize)
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{
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MixDirectHrtfBase<ApplyCoeffs>(LeftOut, RightOut, InSamples, AccumSamples, TempBuf, ChanState,
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IrSize, BufferSize);
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}
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template<>
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void Mix_<CTag>(const al::span<const float> InSamples, const al::span<FloatBufferLine> OutBuffer,
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float *CurrentGains, const float *TargetGains, const size_t Counter, const size_t OutPos)
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{
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const float delta{(Counter > 0) ? 1.0f / static_cast<float>(Counter) : 0.0f};
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const auto min_len = minz(Counter, InSamples.size());
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for(FloatBufferLine &output : OutBuffer)
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{
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float *RESTRICT dst{al::assume_aligned<16>(output.data()+OutPos)};
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float gain{*CurrentGains};
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const float step{(*TargetGains-gain) * delta};
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size_t pos{0};
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if(!(std::abs(step) > std::numeric_limits<float>::epsilon()))
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gain = *TargetGains;
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else
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{
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float step_count{0.0f};
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for(;pos != min_len;++pos)
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{
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dst[pos] += InSamples[pos] * (gain + step*step_count);
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step_count += 1.0f;
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}
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if(pos == Counter)
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gain = *TargetGains;
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else
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gain += step*step_count;
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}
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*CurrentGains = gain;
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++CurrentGains;
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++TargetGains;
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if(!(std::abs(gain) > GainSilenceThreshold))
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continue;
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for(;pos != InSamples.size();++pos)
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dst[pos] += InSamples[pos] * gain;
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}
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}
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