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#include "config.h"
#include "bformatdec.h"
#include <algorithm>
#include <array>
#include <cassert>
#include <cmath>
#include <iterator>
#include <numeric>
#include "AL/al.h"
#include "almalloc.h"
#include "alu.h"
#include "ambdec.h"
#include "filters/splitter.h"
#include "opthelpers.h"
namespace {
constexpr std::array<float,MAX_AMBI_ORDER+1> Ambi3DDecoderHFScale{{
1.00000000e+00f, 1.00000000e+00f
}};
constexpr std::array<float,MAX_AMBI_ORDER+1> Ambi3DDecoderHFScale2O{{
7.45355990e-01f, 1.00000000e+00f, 1.00000000e+00f
}};
constexpr std::array<float,MAX_AMBI_ORDER+1> Ambi3DDecoderHFScale3O{{
5.89792205e-01f, 8.79693856e-01f, 1.00000000e+00f, 1.00000000e+00f
}};
inline auto GetDecoderHFScales(ALuint order) noexcept -> const std::array<float,MAX_AMBI_ORDER+1>&
{
if(order >= 3) return Ambi3DDecoderHFScale3O;
if(order == 2) return Ambi3DDecoderHFScale2O;
return Ambi3DDecoderHFScale;
}
inline auto GetAmbiScales(AmbDecScale scaletype) noexcept
-> const std::array<float,MAX_AMBI_CHANNELS>&
{
if(scaletype == AmbDecScale::FuMa) return AmbiScale::FromFuMa;
if(scaletype == AmbDecScale::SN3D) return AmbiScale::FromSN3D;
return AmbiScale::FromN3D;
}
} // namespace
BFormatDec::BFormatDec(const AmbDecConf *conf, const bool allow_2band, const ALuint inchans,
const ALuint srate, const ALuint (&chanmap)[MAX_OUTPUT_CHANNELS])
{
mDualBand = allow_2band && (conf->FreqBands == 2);
mNumChannels = inchans;
const bool periphonic{(conf->ChanMask&AMBI_PERIPHONIC_MASK) != 0};
const std::array<float,MAX_AMBI_CHANNELS> &coeff_scale = GetAmbiScales(conf->CoeffScale);
if(!mDualBand)
{
for(size_t i{0u};i < conf->Speakers.size();i++)
{
const size_t chanidx{chanmap[i]};
for(size_t j{0},k{0};j < mNumChannels;j++)
{
const size_t acn{periphonic ? j : AmbiIndex::From2D[j]};
if(!(conf->ChanMask&(1u<<acn))) continue;
mMatrix.Single[j][chanidx] = conf->HFMatrix[i][k] / coeff_scale[acn] *
conf->HFOrderGain[AmbiIndex::OrderFromChannel[acn]];
++k;
}
}
}
else
{
mXOver[0].init(conf->XOverFreq / static_cast<float>(srate));
std::fill(std::begin(mXOver)+1, std::end(mXOver), mXOver[0]);
const float ratio{std::pow(10.0f, conf->XOverRatio / 40.0f)};
for(size_t i{0u};i < conf->Speakers.size();i++)
{
const size_t chanidx{chanmap[i]};
for(size_t j{0},k{0};j < mNumChannels;j++)
{
const size_t acn{periphonic ? j : AmbiIndex::From2D[j]};
if(!(conf->ChanMask&(1u<<acn))) continue;
mMatrix.Dual[j][sHFBand][chanidx] = conf->HFMatrix[i][k] / coeff_scale[acn] *
conf->HFOrderGain[AmbiIndex::OrderFromChannel[acn]] * ratio;
mMatrix.Dual[j][sLFBand][chanidx] = conf->LFMatrix[i][k] / coeff_scale[acn] *
conf->LFOrderGain[AmbiIndex::OrderFromChannel[acn]] / ratio;
++k;
}
}
}
}
BFormatDec::BFormatDec(const ALuint inchans, const ChannelDec (&chancoeffs)[MAX_OUTPUT_CHANNELS],
const al::span<const ALuint> chanmap)
{
mNumChannels = inchans;
const ChannelDec *incoeffs{chancoeffs};
auto set_coeffs = [this,inchans,&incoeffs](const ALuint chanidx) noexcept -> void
{
const float (&coeffs)[MAX_AMBI_CHANNELS] = *(incoeffs++);
ASSUME(inchans > 0);
for(size_t j{0};j < inchans;++j)
mMatrix.Single[j][chanidx] = coeffs[j];
};
std::for_each(chanmap.begin(), chanmap.end(), set_coeffs);
}
void BFormatDec::process(const al::span<FloatBufferLine> OutBuffer,
const FloatBufferLine *InSamples, const size_t SamplesToDo)
{
ASSUME(SamplesToDo > 0);
if(mDualBand)
{
const al::span<const float> hfSamples{mSamples[sHFBand].data(), SamplesToDo};
const al::span<const float> lfSamples{mSamples[sLFBand].data(), SamplesToDo};
const size_t numchans{mNumChannels};
for(size_t i{0};i < numchans;i++)
{
mXOver[i].process({InSamples[i].data(), SamplesToDo}, mSamples[sHFBand].data(),
mSamples[sLFBand].data());
MixSamples(hfSamples, OutBuffer, mMatrix.Dual[i][sHFBand], mMatrix.Dual[i][sHFBand],
0, 0);
MixSamples(lfSamples, OutBuffer, mMatrix.Dual[i][sLFBand], mMatrix.Dual[i][sLFBand],
0, 0);
}
}
else
{
const size_t numchans{mNumChannels};
for(size_t i{0};i < numchans;i++)
MixSamples({InSamples[i].data(), SamplesToDo}, OutBuffer, mMatrix.Single[i],
mMatrix.Single[i], 0, 0);
}
}
auto BFormatDec::GetHFOrderScales(const ALuint in_order, const ALuint out_order) noexcept
-> std::array<float,MAX_AMBI_ORDER+1>
{
std::array<float,MAX_AMBI_ORDER+1> ret{};
assert(out_order >= in_order);
const auto &target = GetDecoderHFScales(out_order);
const auto &input = GetDecoderHFScales(in_order);
for(size_t i{0};i < in_order+1;++i)
ret[i] = input[i] / target[i];
return ret;
}
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