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mixer_c.cpp
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mixer_c.cpp
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#include "config.h"
#include <algorithm>
#include <array>
#include <cstddef>
#include <limits>
#include <variant>
#include "alnumeric.h"
#include "alspan.h"
#include "core/bsinc_defs.h"
#include "core/bufferline.h"
#include "core/cubic_defs.h"
#include "core/mixer/hrtfdefs.h"
#include "core/resampler_limits.h"
#include "defs.h"
#include "hrtfbase.h"
#include "opthelpers.h"
struct CTag;
struct PointTag;
struct LerpTag;
struct CubicTag;
struct BSincTag;
struct FastBSincTag;
namespace {
constexpr uint BsincPhaseDiffBits{MixerFracBits - BSincPhaseBits};
constexpr uint BsincPhaseDiffOne{1 << BsincPhaseDiffBits};
constexpr uint BsincPhaseDiffMask{BsincPhaseDiffOne - 1u};
constexpr uint CubicPhaseDiffBits{MixerFracBits - CubicPhaseBits};
constexpr uint CubicPhaseDiffOne{1 << CubicPhaseDiffBits};
constexpr uint CubicPhaseDiffMask{CubicPhaseDiffOne - 1u};
constexpr
auto do_point(const al::span<const float> vals, const size_t pos, const uint) noexcept -> float
{ return vals[pos]; }
constexpr
auto do_lerp(const al::span<const float> vals, const size_t pos, const uint frac) noexcept -> float
{ return lerpf(vals[pos+0], vals[pos+1], static_cast<float>(frac)*(1.0f/MixerFracOne)); }
constexpr
auto do_cubic(const CubicState &istate, const al::span<const float> vals, const size_t pos,
const uint frac) noexcept -> float
{
/* Calculate the phase index and factor. */
const uint pi{frac >> CubicPhaseDiffBits}; ASSUME(pi < CubicPhaseCount);
const float pf{static_cast<float>(frac&CubicPhaseDiffMask) * (1.0f/CubicPhaseDiffOne)};
const auto fil = al::span{istate.filter[pi].mCoeffs};
const auto phd = al::span{istate.filter[pi].mDeltas};
/* Apply the phase interpolated filter. */
return (fil[0] + pf*phd[0])*vals[pos+0] + (fil[1] + pf*phd[1])*vals[pos+1]
+ (fil[2] + pf*phd[2])*vals[pos+2] + (fil[3] + pf*phd[3])*vals[pos+3];
}
constexpr
auto do_bsinc(const BsincState &bsinc, const al::span<const float> vals, const size_t pos,
const uint frac) noexcept -> float
{
const size_t m{bsinc.m};
ASSUME(m > 0);
ASSUME(m <= MaxResamplerPadding);
/* Calculate the phase index and factor. */
const uint pi{frac >> BsincPhaseDiffBits}; ASSUME(pi < BSincPhaseCount);
const float pf{static_cast<float>(frac&BsincPhaseDiffMask) * (1.0f/BsincPhaseDiffOne)};
const auto fil = bsinc.filter.subspan(2_uz*pi*m);
const auto phd = fil.subspan(m);
const auto scd = fil.subspan(BSincPhaseCount*2_uz*m);
const auto spd = scd.subspan(m);
/* Apply the scale and phase interpolated filter. */
float r{0.0f};
for(size_t j_f{0};j_f < m;++j_f)
r += (fil[j_f] + bsinc.sf*scd[j_f] + pf*(phd[j_f] + bsinc.sf*spd[j_f])) * vals[pos+j_f];
return r;
}
constexpr
auto do_fastbsinc(const BsincState &bsinc, const al::span<const float> vals, const size_t pos,
const uint frac) noexcept -> float
{
const size_t m{bsinc.m};
ASSUME(m > 0);
ASSUME(m <= MaxResamplerPadding);
/* Calculate the phase index and factor. */
const uint pi{frac >> BsincPhaseDiffBits}; ASSUME(pi < BSincPhaseCount);
const float pf{static_cast<float>(frac&BsincPhaseDiffMask) * (1.0f/BsincPhaseDiffOne)};
const auto fil = bsinc.filter.subspan(2_uz*pi*m);
const auto phd = fil.subspan(m);
/* Apply the phase interpolated filter. */
float r{0.0f};
for(size_t j_f{0};j_f < m;++j_f)
r += (fil[j_f] + pf*phd[j_f]) * vals[pos+j_f];
return r;
}
template<float(&Sampler)(const al::span<const float>, const size_t, const uint)noexcept>
void DoResample(const al::span<const float> src, uint frac, const uint increment,
const al::span<float> dst)
{
ASSUME(frac < MixerFracOne);
size_t pos{0};
std::generate(dst.begin(), dst.end(), [&pos,&frac,src,increment]() -> float
{
const float output{Sampler(src, pos, frac)};
frac += increment;
pos += frac>>MixerFracBits;
frac &= MixerFracMask;
return output;
});
}
template<typename U, float(&Sampler)(const U&,const al::span<const float>,const size_t,const uint)noexcept>
void DoResample(const U istate, const al::span<const float> src, uint frac, const uint increment,
const al::span<float> dst)
{
ASSUME(frac < MixerFracOne);
size_t pos{0};
std::generate(dst.begin(), dst.end(), [istate,src,&pos,&frac,increment]() -> float
{
const float output{Sampler(istate, src, pos, frac)};
frac += increment;
pos += frac>>MixerFracBits;
frac &= MixerFracMask;
return output;
});
}
inline void ApplyCoeffs(const al::span<float2> Values, const size_t IrSize,
const ConstHrirSpan Coeffs, const float left, const float right) noexcept
{
ASSUME(IrSize >= MinIrLength);
ASSUME(IrSize <= HrirLength);
auto mix_impulse = [left,right](const float2 &value, const float2 &coeff) noexcept -> float2
{ return float2{{value[0] + coeff[0]*left, value[1] + coeff[1]*right}}; };
std::transform(Values.cbegin(), Values.cbegin()+ptrdiff_t(IrSize), Coeffs.cbegin(),
Values.begin(), mix_impulse);
}
force_inline void MixLine(al::span<const float> InSamples, const al::span<float> dst,
float &CurrentGain, const float TargetGain, const float delta, const size_t fade_len,
size_t Counter)
{
const float step{(TargetGain-CurrentGain) * delta};
auto output = dst.begin();
if(std::abs(step) > std::numeric_limits<float>::epsilon())
{
auto input = InSamples.first(fade_len);
InSamples = InSamples.subspan(fade_len);
const float gain{CurrentGain};
float step_count{0.0f};
output = std::transform(input.begin(), input.end(), output, output,
[gain,step,&step_count](const float in, float out) noexcept -> float
{
out += in * (gain + step*step_count);
step_count += 1.0f;
return out;
});
if(fade_len < Counter)
{
CurrentGain = gain + step*step_count;
return;
}
}
CurrentGain = TargetGain;
if(!(std::abs(TargetGain) > GainSilenceThreshold))
return;
std::transform(InSamples.begin(), InSamples.end(), output, output,
[TargetGain](const float in, const float out) noexcept -> float
{ return out + in*TargetGain; });
}
} // namespace
template<>
void Resample_<PointTag,CTag>(const InterpState*, const al::span<const float> src, uint frac,
const uint increment, const al::span<float> dst)
{ DoResample<do_point>(src.subspan(MaxResamplerEdge), frac, increment, dst); }
template<>
void Resample_<LerpTag,CTag>(const InterpState*, const al::span<const float> src, uint frac,
const uint increment, const al::span<float> dst)
{ DoResample<do_lerp>(src.subspan(MaxResamplerEdge), frac, increment, dst); }
template<>
void Resample_<CubicTag,CTag>(const InterpState *state, const al::span<const float> src, uint frac,
const uint increment, const al::span<float> dst)
{
DoResample<CubicState,do_cubic>(std::get<CubicState>(*state), src.subspan(MaxResamplerEdge-1),
frac, increment, dst);
}
template<>
void Resample_<BSincTag,CTag>(const InterpState *state, const al::span<const float> src, uint frac,
const uint increment, const al::span<float> dst)
{
const auto istate = std::get<BsincState>(*state);
ASSUME(istate.l <= MaxResamplerEdge);
DoResample<BsincState,do_bsinc>(istate, src.subspan(MaxResamplerEdge-istate.l), frac,
increment, dst);
}
template<>
void Resample_<FastBSincTag,CTag>(const InterpState *state, const al::span<const float> src,
uint frac, const uint increment, const al::span<float> dst)
{
const auto istate = std::get<BsincState>(*state);
ASSUME(istate.l <= MaxResamplerEdge);
DoResample<BsincState,do_fastbsinc>(istate, src.subspan(MaxResamplerEdge-istate.l), frac,
increment, dst);
}
template<>
void MixHrtf_<CTag>(const al::span<const float> InSamples, const al::span<float2> AccumSamples,
const uint IrSize, const MixHrtfFilter *hrtfparams, const size_t SamplesToDo)
{ MixHrtfBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, hrtfparams, SamplesToDo); }
template<>
void MixHrtfBlend_<CTag>(const al::span<const float> InSamples,const al::span<float2> AccumSamples,
const uint IrSize, const HrtfFilter *oldparams, const MixHrtfFilter *newparams,
const size_t SamplesToDo)
{
MixHrtfBlendBase<ApplyCoeffs>(InSamples, AccumSamples, IrSize, oldparams, newparams,
SamplesToDo);
}
template<>
void MixDirectHrtf_<CTag>(const FloatBufferSpan LeftOut, const FloatBufferSpan RightOut,
const al::span<const FloatBufferLine> InSamples, const al::span<float2> AccumSamples,
const al::span<float,BufferLineSize> TempBuf, const al::span<HrtfChannelState> ChanState,
const size_t IrSize, const size_t SamplesToDo)
{
MixDirectHrtfBase<ApplyCoeffs>(LeftOut, RightOut, InSamples, AccumSamples, TempBuf, ChanState,
IrSize, SamplesToDo);
}
template<>
void Mix_<CTag>(const al::span<const float> InSamples, const al::span<FloatBufferLine> OutBuffer,
const al::span<float> CurrentGains, const al::span<const float> TargetGains,
const size_t Counter, const size_t OutPos)
{
const float delta{(Counter > 0) ? 1.0f / static_cast<float>(Counter) : 0.0f};
const auto fade_len = std::min(Counter, InSamples.size());
auto curgains = CurrentGains.begin();
auto targetgains = TargetGains.cbegin();
for(FloatBufferLine &output : OutBuffer)
MixLine(InSamples, al::span{output}.subspan(OutPos), *curgains++, *targetgains++, delta,
fade_len, Counter);
}
template<>
void Mix_<CTag>(const al::span<const float> InSamples, const al::span<float> OutBuffer,
float &CurrentGain, const float TargetGain, const size_t Counter)
{
const float delta{(Counter > 0) ? 1.0f / static_cast<float>(Counter) : 0.0f};
const auto fade_len = std::min(Counter, InSamples.size());
MixLine(InSamples, OutBuffer, CurrentGain, TargetGain, delta, fade_len, Counter);
}