304 lines
11 KiB
C++
304 lines
11 KiB
C++
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#include "config.h"
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#include <cmath>
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#include <array>
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#include <vector>
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#include <numeric>
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#include <algorithm>
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#include <functional>
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#include "bformatdec.h"
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#include "ambdec.h"
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#include "filters/splitter.h"
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#include "alu.h"
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#include "threads.h"
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#include "almalloc.h"
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namespace {
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#define HF_BAND 0
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#define LF_BAND 1
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static_assert(BFormatDec::sNumBands == 2, "Unexpected BFormatDec::sNumBands");
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static_assert(AmbiUpsampler::sNumBands == 2, "Unexpected AmbiUpsampler::sNumBands");
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/* These points are in AL coordinates! */
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constexpr ALfloat Ambi3DPoints[8][3] = {
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{ -0.577350269f, 0.577350269f, -0.577350269f },
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{ 0.577350269f, 0.577350269f, -0.577350269f },
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{ -0.577350269f, 0.577350269f, 0.577350269f },
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{ 0.577350269f, 0.577350269f, 0.577350269f },
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{ -0.577350269f, -0.577350269f, -0.577350269f },
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{ 0.577350269f, -0.577350269f, -0.577350269f },
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{ -0.577350269f, -0.577350269f, 0.577350269f },
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{ 0.577350269f, -0.577350269f, 0.577350269f },
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};
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constexpr ALfloat Ambi3DDecoder[8][MAX_AMBI_COEFFS] = {
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{ 0.125f, 0.125f, 0.125f, 0.125f },
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{ 0.125f, -0.125f, 0.125f, 0.125f },
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{ 0.125f, 0.125f, 0.125f, -0.125f },
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{ 0.125f, -0.125f, 0.125f, -0.125f },
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{ 0.125f, 0.125f, -0.125f, 0.125f },
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{ 0.125f, -0.125f, -0.125f, 0.125f },
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{ 0.125f, 0.125f, -0.125f, -0.125f },
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{ 0.125f, -0.125f, -0.125f, -0.125f },
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};
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constexpr ALfloat Ambi3DDecoderHFScale[MAX_AMBI_COEFFS] = {
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2.0f,
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1.15470054f, 1.15470054f, 1.15470054f
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};
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auto GetAmbiScales(AmbDecScale scaletype) noexcept -> const float(&)[MAX_AMBI_COEFFS]
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{
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if(scaletype == AmbDecScale::FuMa) return AmbiScale::FromFuMa;
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if(scaletype == AmbDecScale::SN3D) return AmbiScale::FromSN3D;
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return AmbiScale::FromN3D;
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}
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} // namespace
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void BFormatDec::reset(const AmbDecConf *conf, ALsizei chancount, ALuint srate, const ALsizei (&chanmap)[MAX_OUTPUT_CHANNELS])
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{
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static constexpr ALsizei map2DTo3D[MAX_AMBI2D_COEFFS]{ 0, 1, 3, 4, 8, 9, 15 };
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mSamples.clear();
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mSamplesHF = nullptr;
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mSamplesLF = nullptr;
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mNumChannels = chancount;
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mSamples.resize(chancount * 2);
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mSamplesHF = mSamples.data();
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mSamplesLF = mSamplesHF + chancount;
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mEnabled = std::accumulate(std::begin(chanmap), std::begin(chanmap)+conf->Speakers.size(), 0u,
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[](ALuint mask, const ALsizei &chan) noexcept -> ALuint
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{ return mask | (1 << chan); }
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);
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mUpSampler[0].XOver.init(400.0f / (float)srate);
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std::fill(std::begin(mUpSampler[0].Gains), std::end(mUpSampler[0].Gains), 0.0f);
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std::fill(std::begin(mUpSampler)+1, std::end(mUpSampler), mUpSampler[0]);
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const bool periphonic{(conf->ChanMask&AMBI_PERIPHONIC_MASK) != 0};
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if(periphonic)
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{
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ALfloat encgains[8][MAX_OUTPUT_CHANNELS]{};
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for(size_t k{0u};k < COUNTOF(Ambi3DPoints);k++)
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{
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ALfloat coeffs[MAX_AMBI_COEFFS];
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CalcDirectionCoeffs(Ambi3DPoints[k], 0.0f, coeffs);
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std::copy(std::begin(coeffs), std::begin(coeffs)+chancount, std::begin(encgains[k]));
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}
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assert(chancount >= 4);
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for(ALsizei i{0};i < 4;i++)
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{
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ALdouble gain{0.0};
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for(size_t k{0u};k < COUNTOF(Ambi3DDecoder);k++)
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gain += (ALdouble)Ambi3DDecoder[k][i] * encgains[k][i];
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mUpSampler[i].Gains[HF_BAND] = (ALfloat)(gain * Ambi3DDecoderHFScale[i]);
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mUpSampler[i].Gains[LF_BAND] = (ALfloat)gain;
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}
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}
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else
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{
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ALfloat encgains[8][MAX_OUTPUT_CHANNELS]{};
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for(size_t k{0u};k < COUNTOF(Ambi3DPoints);k++)
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{
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ALfloat coeffs[MAX_AMBI_COEFFS];
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CalcDirectionCoeffs(Ambi3DPoints[k], 0.0f, coeffs);
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auto ambimap_end = std::begin(map2DTo3D) + chancount;
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std::transform(std::begin(map2DTo3D), ambimap_end, std::begin(encgains[k]),
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[&coeffs](const ALsizei &index) noexcept -> ALfloat
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{ ASSUME(index > 0); return coeffs[index]; }
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);
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}
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assert(chancount >= 3);
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for(ALsizei c{0};c < 3;c++)
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{
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const ALsizei i{map2DTo3D[c]};
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ALdouble gain{0.0};
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for(size_t k{0u};k < COUNTOF(Ambi3DDecoder);k++)
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gain += (ALdouble)Ambi3DDecoder[k][i] * encgains[k][c];
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mUpSampler[c].Gains[HF_BAND] = (ALfloat)(gain * Ambi3DDecoderHFScale[i]);
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mUpSampler[c].Gains[LF_BAND] = (ALfloat)gain;
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}
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mUpSampler[3].Gains[HF_BAND] = 0.0f;
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mUpSampler[3].Gains[LF_BAND] = 0.0f;
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}
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const float (&coeff_scale)[MAX_AMBI_COEFFS] = GetAmbiScales(conf->CoeffScale);
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const ALsizei coeff_count{periphonic ? MAX_AMBI_COEFFS : MAX_AMBI2D_COEFFS};
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mMatrix = MatrixU{};
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mDualBand = (conf->FreqBands == 2);
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if(!mDualBand)
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{
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for(size_t i{0u};i < conf->Speakers.size();i++)
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{
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ALfloat (&mtx)[MAX_AMBI_COEFFS] = mMatrix.Single[chanmap[i]];
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for(ALsizei j{0},k{0};j < coeff_count;j++)
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{
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const ALsizei l{periphonic ? j : map2DTo3D[j]};
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if(!(conf->ChanMask&(1<<l))) continue;
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mtx[j] = conf->HFMatrix[i][k] / coeff_scale[l] *
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((l>=9) ? conf->HFOrderGain[3] :
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(l>=4) ? conf->HFOrderGain[2] :
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(l>=1) ? conf->HFOrderGain[1] : conf->HFOrderGain[0]);
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++k;
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}
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}
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}
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else
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{
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mXOver[0].init(conf->XOverFreq / (float)srate);
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std::fill(std::begin(mXOver)+1, std::end(mXOver), mXOver[0]);
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const float ratio{std::pow(10.0f, conf->XOverRatio / 40.0f)};
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for(size_t i{0u};i < conf->Speakers.size();i++)
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{
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ALfloat (&mtx)[sNumBands][MAX_AMBI_COEFFS] = mMatrix.Dual[chanmap[i]];
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for(ALsizei j{0},k{0};j < coeff_count;j++)
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{
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const ALsizei l{periphonic ? j : map2DTo3D[j]};
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if(!(conf->ChanMask&(1<<l))) continue;
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mtx[HF_BAND][j] = conf->HFMatrix[i][k] / coeff_scale[l] *
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((l>=9) ? conf->HFOrderGain[3] :
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(l>=4) ? conf->HFOrderGain[2] :
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(l>=1) ? conf->HFOrderGain[1] : conf->HFOrderGain[0]) * ratio;
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mtx[LF_BAND][j] = conf->LFMatrix[i][k] / coeff_scale[l] *
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((l>=9) ? conf->LFOrderGain[3] :
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(l>=4) ? conf->LFOrderGain[2] :
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(l>=1) ? conf->LFOrderGain[1] : conf->LFOrderGain[0]) / ratio;
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++k;
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}
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}
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}
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}
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void BFormatDec::process(ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], const ALsizei OutChannels, const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], const ALsizei SamplesToDo)
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{
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ASSUME(OutChannels > 0);
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ASSUME(SamplesToDo > 0);
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if(mDualBand)
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{
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for(ALsizei i{0};i < mNumChannels;i++)
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mXOver[i].process(mSamplesHF[i].data(), mSamplesLF[i].data(), InSamples[i],
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SamplesToDo);
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for(ALsizei chan{0};chan < OutChannels;chan++)
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{
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if(UNLIKELY(!(mEnabled&(1<<chan))))
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continue;
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std::fill(std::begin(mChannelMix), std::begin(mChannelMix)+SamplesToDo, 0.0f);
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MixRowSamples(mChannelMix, mMatrix.Dual[chan][HF_BAND],
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&reinterpret_cast<ALfloat(&)[BUFFERSIZE]>(mSamplesHF[0]),
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mNumChannels, 0, SamplesToDo
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);
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MixRowSamples(mChannelMix, mMatrix.Dual[chan][LF_BAND],
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&reinterpret_cast<ALfloat(&)[BUFFERSIZE]>(mSamplesLF[0]),
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mNumChannels, 0, SamplesToDo
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);
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std::transform(std::begin(mChannelMix), std::begin(mChannelMix)+SamplesToDo,
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OutBuffer[chan], OutBuffer[chan], std::plus<float>());
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}
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}
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else
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{
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for(ALsizei chan{0};chan < OutChannels;chan++)
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{
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if(UNLIKELY(!(mEnabled&(1<<chan))))
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continue;
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std::fill(std::begin(mChannelMix), std::begin(mChannelMix)+SamplesToDo, 0.0f);
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MixRowSamples(mChannelMix, mMatrix.Single[chan], InSamples,
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mNumChannels, 0, SamplesToDo);
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std::transform(std::begin(mChannelMix), std::begin(mChannelMix)+SamplesToDo,
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OutBuffer[chan], OutBuffer[chan], std::plus<float>());
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}
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}
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}
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void BFormatDec::upSample(ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], const ALsizei InChannels, const ALsizei SamplesToDo)
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{
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ASSUME(InChannels > 0);
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ASSUME(SamplesToDo > 0);
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/* This up-sampler leverages the differences observed in dual-band higher-
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* order decoder matrices compared to first-order. For the same output
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* channel configuration, the low-frequency matrix has identical
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* coefficients in the shared input channels, while the high-frequency
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* matrix has extra scalars applied to the W channel and X/Y/Z channels.
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* Mixing the first-order content into the higher-order stream with the
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* appropriate counter-scales applied to the HF response results in the
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* subsequent higher-order decode generating the same response as a first-
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* order decode.
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*/
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for(ALsizei i{0};i < InChannels;i++)
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{
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/* First, split the first-order components into low and high frequency
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* bands.
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*/
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mUpSampler[i].XOver.process(mSamples[HF_BAND].data(), mSamples[LF_BAND].data(),
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InSamples[i], SamplesToDo);
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/* Now write each band to the output. */
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MixRowSamples(OutBuffer[i], mUpSampler[i].Gains,
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&reinterpret_cast<ALfloat(&)[BUFFERSIZE]>(mSamples[0]),
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sNumBands, 0, SamplesToDo);
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}
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}
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void AmbiUpsampler::reset(const ALCdevice *device)
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{
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mXOver[0].init(400.0f / (float)device->Frequency);
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std::fill(std::begin(mXOver)+1, std::end(mXOver), mXOver[0]);
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ALfloat encgains[8][MAX_OUTPUT_CHANNELS];
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for(size_t k{0u};k < COUNTOF(Ambi3DPoints);k++)
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{
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ALfloat coeffs[MAX_AMBI_COEFFS];
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CalcDirectionCoeffs(Ambi3DPoints[k], 0.0f, coeffs);
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ComputePanGains(&device->Dry, coeffs, 1.0f, encgains[k]);
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}
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/* Combine the matrices that do the in->virt and virt->out conversions so
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* we get a single in->out conversion. NOTE: the Encoder matrix (encgains)
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* and output are transposed, so the input channels line up with the rows
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* and the output channels line up with the columns.
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*/
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mGains.fill({});
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for(ALsizei i{0};i < 4;i++)
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{
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for(ALsizei j{0};j < device->Dry.NumChannels;j++)
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{
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ALdouble gain{0.0};
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for(size_t k{0u};k < COUNTOF(Ambi3DDecoder);k++)
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gain += (ALdouble)Ambi3DDecoder[k][i] * encgains[k][j];
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mGains[i][HF_BAND][j] = (ALfloat)(gain * Ambi3DDecoderHFScale[i]);
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mGains[i][LF_BAND][j] = (ALfloat)gain;
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}
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}
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}
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void AmbiUpsampler::process(ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], const ALsizei OutChannels, const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], const ALsizei SamplesToDo)
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{
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for(ALsizei i{0};i < 4;i++)
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{
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mXOver[i].process(mSamples[HF_BAND], mSamples[LF_BAND], InSamples[i], SamplesToDo);
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MixSamples(mSamples[HF_BAND], OutChannels, OutBuffer, mGains[i][HF_BAND].data(),
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mGains[i][HF_BAND].data(), 0, 0, SamplesToDo);
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MixSamples(mSamples[LF_BAND], OutChannels, OutBuffer, mGains[i][LF_BAND].data(),
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mGains[i][LF_BAND].data(), 0, 0, SamplesToDo);
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}
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}
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