/**
* OpenAL cross platform audio library
* Copyright (C) 2011 by Chris Robinson
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#include "config.h"
#include "hrtf.h"
#include <algorithm>
#include <array>
#include <cassert>
#include <cctype>
#include <cstdint>
#include <cstdio>
#include <cstring>
#include <functional>
#include <fstream>
#include <iterator>
#include <memory>
#include <mutex>
#include <new>
#include <numeric>
#include <type_traits>
#include <utility>
#include "AL/al.h"
#include "alcmain.h"
#include "alconfig.h"
#include "alfstream.h"
#include "almalloc.h"
#include "alnumeric.h"
#include "aloptional.h"
#include "alspan.h"
#include "filters/splitter.h"
#include "logging.h"
#include "math_defs.h"
#include "opthelpers.h"
#include "polyphase_resampler.h"
namespace {
using namespace std::placeholders;
struct HrtfEntry {
std::string mDispName;
std::string mFilename;
};
struct LoadedHrtf {
std::string mFilename;
std::unique_ptr<HrtfStore> mEntry;
};
/* Data set limits must be the same as or more flexible than those defined in
* the makemhr utility.
*/
#define MIN_FD_COUNT (1)
#define MAX_FD_COUNT (16)
#define MIN_FD_DISTANCE (50)
#define MAX_FD_DISTANCE (2500)
#define MIN_EV_COUNT (5)
#define MAX_EV_COUNT (181)
#define MIN_AZ_COUNT (1)
#define MAX_AZ_COUNT (255)
#define MAX_HRIR_DELAY (HRTF_HISTORY_LENGTH-1)
#define HRIR_DELAY_FRACBITS 2
#define HRIR_DELAY_FRACONE (1<<HRIR_DELAY_FRACBITS)
#define HRIR_DELAY_FRACHALF (HRIR_DELAY_FRACONE>>1)
static_assert(MAX_HRIR_DELAY*HRIR_DELAY_FRACONE < 256, "MAX_HRIR_DELAY or DELAY_FRAC too large");
constexpr ALchar magicMarker00[8]{'M','i','n','P','H','R','0','0'};
constexpr ALchar magicMarker01[8]{'M','i','n','P','H','R','0','1'};
constexpr ALchar magicMarker02[8]{'M','i','n','P','H','R','0','2'};
/* First value for pass-through coefficients (remaining are 0), used for omni-
* directional sounds. */
constexpr ALfloat PassthruCoeff{0.707106781187f/*sqrt(0.5)*/};
std::mutex LoadedHrtfLock;
al::vector<LoadedHrtf> LoadedHrtfs;
std::mutex EnumeratedHrtfLock;
al::vector<HrtfEntry> EnumeratedHrtfs;
class databuf final : public std::streambuf {
int_type underflow() override
{ return traits_type::eof(); }
pos_type seekoff(off_type offset, std::ios_base::seekdir whence, std::ios_base::openmode mode) override
{
if((mode&std::ios_base::out) || !(mode&std::ios_base::in))
return traits_type::eof();
char_type *cur;
switch(whence)
{
case std::ios_base::beg:
if(offset < 0 || offset > egptr()-eback())
return traits_type::eof();
cur = eback() + offset;
break;
case std::ios_base::cur:
if((offset >= 0 && offset > egptr()-gptr()) ||
(offset < 0 && -offset > gptr()-eback()))
return traits_type::eof();
cur = gptr() + offset;
break;
case std::ios_base::end:
if(offset > 0 || -offset > egptr()-eback())
return traits_type::eof();
cur = egptr() + offset;
break;
default:
return traits_type::eof();
}
setg(eback(), cur, egptr());
return cur - eback();
}
pos_type seekpos(pos_type pos, std::ios_base::openmode mode) override
{
// Simplified version of seekoff
if((mode&std::ios_base::out) || !(mode&std::ios_base::in))
return traits_type::eof();
if(pos < 0 || pos > egptr()-eback())
return traits_type::eof();
setg(eback(), eback() + static_cast<size_t>(pos), egptr());
return pos;
}
public:
databuf(const char_type *start_, const char_type *end_) noexcept
{
setg(const_cast<char_type*>(start_), const_cast<char_type*>(start_),
const_cast<char_type*>(end_));
}
};
class idstream final : public std::istream {
databuf mStreamBuf;
public:
idstream(const char *start_, const char *end_)
: std::istream{nullptr}, mStreamBuf{start_, end_}
{ init(&mStreamBuf); }
};
struct IdxBlend { ALuint idx; float blend; };
/* Calculate the elevation index given the polar elevation in radians. This
* will return an index between 0 and (evcount - 1).
*/
IdxBlend CalcEvIndex(ALuint evcount, float ev)
{
ev = (al::MathDefs<float>::Pi()*0.5f + ev) * static_cast<float>(evcount-1) /
al::MathDefs<float>::Pi();
ALuint idx{float2uint(ev)};
return IdxBlend{minu(idx, evcount-1), ev-static_cast<float>(idx)};
}
/* Calculate the azimuth index given the polar azimuth in radians. This will
* return an index between 0 and (azcount - 1).
*/
IdxBlend CalcAzIndex(ALuint azcount, float az)
{
az = (al::MathDefs<float>::Tau()+az) * static_cast<float>(azcount) /
al::MathDefs<float>::Tau();
ALuint idx{float2uint(az)};
return IdxBlend{idx%azcount, az-static_cast<float>(idx)};
}
} // namespace
/* Calculates static HRIR coefficients and delays for the given polar elevation
* and azimuth in radians. The coefficients are normalized.
*/
void GetHrtfCoeffs(const HrtfStore *Hrtf, float elevation, float azimuth, float distance,
float spread, HrirArray &coeffs, ALuint (&delays)[2])
{
const float dirfact{1.0f - (spread / al::MathDefs<float>::Tau())};
const auto *field = Hrtf->field;
const auto *field_end = field + Hrtf->fdCount-1;
size_t ebase{0};
while(distance < field->distance && field != field_end)
{
ebase += field->evCount;
++field;
}
/* Claculate the elevation indinces. */
const auto elev0 = CalcEvIndex(field->evCount, elevation);
const size_t elev1_idx{minu(elev0.idx+1, field->evCount-1)};
const size_t ir0offset{Hrtf->elev[ebase + elev0.idx].irOffset};
const size_t ir1offset{Hrtf->elev[ebase + elev1_idx].irOffset};
/* Calculate azimuth indices. */
const auto az0 = CalcAzIndex(Hrtf->elev[ebase + elev0.idx].azCount, azimuth);
const auto az1 = CalcAzIndex(Hrtf->elev[ebase + elev1_idx].azCount, azimuth);
/* Calculate the HRIR indices to blend. */
const size_t idx[4]{
ir0offset + az0.idx,
ir0offset + ((az0.idx+1) % Hrtf->elev[ebase + elev0.idx].azCount),
ir1offset + az1.idx,
ir1offset + ((az1.idx+1) % Hrtf->elev[ebase + elev1_idx].azCount)
};
/* Calculate bilinear blending weights, attenuated according to the
* directional panning factor.
*/
const float blend[4]{
(1.0f-elev0.blend) * (1.0f-az0.blend) * dirfact,
(1.0f-elev0.blend) * ( az0.blend) * dirfact,
( elev0.blend) * (1.0f-az1.blend) * dirfact,
( elev0.blend) * ( az1.blend) * dirfact
};
/* Calculate the blended HRIR delays. */
float d{Hrtf->delays[idx[0]][0]*blend[0] + Hrtf->delays[idx[1]][0]*blend[1] +
Hrtf->delays[idx[2]][0]*blend[2] + Hrtf->delays[idx[3]][0]*blend[3]};
delays[0] = fastf2u(d * float{1.0f/HRIR_DELAY_FRACONE});
d = Hrtf->delays[idx[0]][1]*blend[0] + Hrtf->delays[idx[1]][1]*blend[1] +
Hrtf->delays[idx[2]][1]*blend[2] + Hrtf->delays[idx[3]][1]*blend[1];
delays[1] = fastf2u(d * float{1.0f/HRIR_DELAY_FRACONE});
const ALuint irSize{Hrtf->irSize};
ASSUME(irSize >= MIN_IR_LENGTH);
/* Calculate the blended HRIR coefficients. */
float *coeffout{al::assume_aligned<16>(&coeffs[0][0])};
coeffout[0] = PassthruCoeff * (1.0f-dirfact);
coeffout[1] = PassthruCoeff * (1.0f-dirfact);
std::fill(coeffout+2, coeffout + HRIR_LENGTH*2, 0.0f);
for(ALsizei c{0};c < 4;c++)
{
const float *srccoeffs{al::assume_aligned<16>(Hrtf->coeffs[idx[c]][0].data())};
const float mult{blend[c]};
auto blend_coeffs = [mult](const ALfloat src, const ALfloat coeff) noexcept -> ALfloat
{ return src*mult + coeff; };
std::transform(srccoeffs, srccoeffs + irSize*2, coeffout, coeffout, blend_coeffs);
}
}
std::unique_ptr<DirectHrtfState> DirectHrtfState::Create(size_t num_chans)
{
return std::unique_ptr<DirectHrtfState>{new (FamCount{num_chans}) DirectHrtfState{num_chans}};
}
void BuildBFormatHrtf(const HrtfStore *Hrtf, DirectHrtfState *state,
const al::span<const AngularPoint> AmbiPoints, const ALfloat (*AmbiMatrix)[MAX_AMBI_CHANNELS],
const ALfloat *AmbiOrderHFGain)
{
using double2 = std::array<double,2>;
struct ImpulseResponse {
alignas(16) std::array<double2,HRIR_LENGTH> hrir;
ALuint ldelay, rdelay;
};
static const int OrderFromChan[MAX_AMBI_CHANNELS]{
0, 1,1,1, 2,2,2,2,2, 3,3,3,3,3,3,3,
};
/* Set this to true for dual-band HRTF processing. May require better
* calculation of the new IR length to deal with the head and tail
* generated by the HF scaling.
*/
static constexpr bool DualBand{true};
ALuint min_delay{HRTF_HISTORY_LENGTH*HRIR_DELAY_FRACONE};
ALuint max_delay{0};
al::vector<ImpulseResponse> impres; impres.reserve(AmbiPoints.size());
auto calc_res = [Hrtf,&max_delay,&min_delay](const AngularPoint &pt) -> ImpulseResponse
{
ImpulseResponse res;
auto &field = Hrtf->field[0];
/* Calculate the elevation indices. */
const auto elev0 = CalcEvIndex(field.evCount, pt.Elev.value);
const size_t elev1_idx{minu(elev0.idx+1, field.evCount-1)};
const size_t ir0offset{Hrtf->elev[elev0.idx].irOffset};
const size_t ir1offset{Hrtf->elev[elev1_idx].irOffset};
/* Calculate azimuth indices. */
const auto az0 = CalcAzIndex(Hrtf->elev[elev0.idx].azCount, pt.Azim.value);
const auto az1 = CalcAzIndex(Hrtf->elev[elev1_idx].azCount, pt.Azim.value);
/* Calculate the HRIR indices to blend. */
const size_t idx[4]{
ir0offset + az0.idx,
ir0offset + ((az0.idx+1) % Hrtf->elev[elev0.idx].azCount),
ir1offset + az1.idx,
ir1offset + ((az1.idx+1) % Hrtf->elev[elev1_idx].azCount)};
/* Calculate bilinear blending weights. */
const double blend[4]{
(1.0-elev0.blend) * (1.0-az0.blend),
(1.0-elev0.blend) * ( az0.blend),
( elev0.blend) * (1.0-az1.blend),
( elev0.blend) * ( az1.blend)};
/* Calculate the blended HRIR delays (in fixed-point). */
double d{Hrtf->delays[idx[0]][0]*blend[0] + Hrtf->delays[idx[1]][0]*blend[1] +
Hrtf->delays[idx[2]][0]*blend[2] + Hrtf->delays[idx[3]][0]*blend[3]};
res.ldelay = fastf2u(static_cast<float>(d));
d = Hrtf->delays[idx[0]][1]*blend[0] + Hrtf->delays[idx[1]][1]*blend[1] +
Hrtf->delays[idx[2]][1]*blend[2] + Hrtf->delays[idx[3]][1]*blend[3];
res.rdelay = fastf2u(static_cast<float>(d));
/* Calculate the blended HRIR coefficients. */
double *coeffout{al::assume_aligned<16>(&res.hrir[0][0])};
std::fill(coeffout, coeffout + HRIR_LENGTH*2, 0.0);
for(ALsizei c{0};c < 4;c++)
{
const float *srccoeffs{al::assume_aligned<16>(Hrtf->coeffs[idx[c]][0].data())};
const double mult{blend[c]};
auto blend_coeffs = [mult](const float src, const double coeff) noexcept -> double
{ return src*mult + coeff; };
std::transform(srccoeffs, srccoeffs + HRIR_LENGTH*2, coeffout, coeffout, blend_coeffs);
}
min_delay = minu(min_delay, minu(res.ldelay, res.rdelay));
max_delay = maxu(max_delay, maxu(res.ldelay, res.rdelay));
return res;
};
std::transform(AmbiPoints.begin(), AmbiPoints.end(), std::back_inserter(impres), calc_res);
auto hrir_delay_round = [](const ALuint d) noexcept -> ALuint
{ return (d+HRIR_DELAY_FRACHALF) >> HRIR_DELAY_FRACBITS; };
/* For dual-band processing, add a 16-sample delay to compensate for the HF
* scale on the minimum-phase response.
*/
static constexpr ALuint base_delay{DualBand ? 16 : 0};
const double xover_norm{400.0 / Hrtf->sampleRate};
BandSplitterR<double> splitter{xover_norm};
auto tmpres = al::vector<std::array<double2,HRIR_LENGTH>>(state->Coeffs.size());
auto tmpflt = al::vector<std::array<double,HRIR_LENGTH*4>>(3);
for(size_t c{0u};c < AmbiPoints.size();++c)
{
const al::span<const double2,HRIR_LENGTH> hrir{impres[c].hrir};
const ALuint ldelay{hrir_delay_round(impres[c].ldelay-min_delay) + base_delay};
const ALuint rdelay{hrir_delay_round(impres[c].rdelay-min_delay) + base_delay};
if /*constexpr*/(!DualBand)
{
/* For single-band decoding, apply the HF scale to the response. */
for(size_t i{0u};i < state->Coeffs.size();++i)
{
const double mult{double{AmbiOrderHFGain[OrderFromChan[i]]} * AmbiMatrix[c][i]};
const ALuint numirs{HRIR_LENGTH - maxu(ldelay, rdelay)};
ALuint lidx{ldelay}, ridx{rdelay};
for(ALuint j{0};j < numirs;++j)
{
tmpres[i][lidx++][0] += hrir[j][0] * mult;
tmpres[i][ridx++][1] += hrir[j][1] * mult;
}
}
continue;
}
/* For dual-band processing, the HRIR needs to be split into low and
* high frequency responses. The band-splitter alone creates frequency-
* dependent phase-shifts, which is not ideal. To counteract it,
* combine it with a backwards phase-shift.
*/
/* Load the (left) HRIR backwards, into a temp buffer with padding. */
std::fill(tmpflt[2].begin(), tmpflt[2].end(), 0.0);
std::transform(hrir.cbegin(), hrir.cend(), tmpflt[2].rbegin() + HRIR_LENGTH*3,
[](const double2 &ir) noexcept -> double { return ir[0]; });
/* Apply the all-pass on the reversed signal and reverse the resulting
* sample array. This produces the forward response with a backwards
* phase-shift (+n degrees becomes -n degrees).
*/
splitter.applyAllpass(tmpflt[2].data(), tmpflt[2].size());
std::reverse(tmpflt[2].begin(), tmpflt[2].end());
/* Now apply the band-splitter. This applies the normal phase-shift,
* which cancels out with the backwards phase-shift to get the original
* phase on the split signal.
*/
splitter.clear();
splitter.process(tmpflt[0].data(), tmpflt[1].data(), tmpflt[2].data(), tmpflt[2].size());
/* Apply left ear response with delay and HF scale. */
for(size_t i{0u};i < state->Coeffs.size();++i)
{
const ALdouble mult{AmbiMatrix[c][i]};
const ALdouble hfgain{AmbiOrderHFGain[OrderFromChan[i]]};
ALuint j{HRIR_LENGTH*3 - ldelay};
for(ALuint lidx{0};lidx < HRIR_LENGTH;++lidx,++j)
tmpres[i][lidx][0] += (tmpflt[0][j]*hfgain + tmpflt[1][j]) * mult;
}
/* Now run the same process on the right HRIR. */
std::fill(tmpflt[2].begin(), tmpflt[2].end(), 0.0);
std::transform(hrir.cbegin(), hrir.cend(), tmpflt[2].rbegin() + HRIR_LENGTH*3,
[](const double2 &ir) noexcept -> double { return ir[1]; });
splitter.applyAllpass(tmpflt[2].data(), tmpflt[2].size());
std::reverse(tmpflt[2].begin(), tmpflt[2].end());
splitter.clear();
splitter.process(tmpflt[0].data(), tmpflt[1].data(), tmpflt[2].data(), tmpflt[2].size());
for(size_t i{0u};i < state->Coeffs.size();++i)
{
const ALdouble mult{AmbiMatrix[c][i]};
const ALdouble hfgain{AmbiOrderHFGain[OrderFromChan[i]]};
ALuint j{HRIR_LENGTH*3 - rdelay};
for(ALuint ridx{0};ridx < HRIR_LENGTH;++ridx,++j)
tmpres[i][ridx][1] += (tmpflt[0][j]*hfgain + tmpflt[1][j]) * mult;
}
}
tmpflt.clear();
impres.clear();
for(size_t i{0u};i < state->Coeffs.size();++i)
{
auto copy_arr = [](const double2 &in) noexcept -> float2
{ return float2{{static_cast<float>(in[0]), static_cast<float>(in[1])}}; };
std::transform(tmpres[i].cbegin(), tmpres[i].cend(), state->Coeffs[i].begin(),
copy_arr);
}
tmpres.clear();
max_delay -= min_delay;
ALuint max_length{HRIR_LENGTH};
/* Increase the IR size by double the base delay with dual-band processing
* to account for the head and tail from the HF response scale.
*/
const ALuint irsize{minu(Hrtf->irSize + base_delay*2, max_length)};
max_length = minu(hrir_delay_round(max_delay) + irsize, max_length);
TRACE("Skipped delay: %.2f, max delay: %.2f, new FIR length: %u\n",
min_delay/double{HRIR_DELAY_FRACONE}, max_delay/double{HRIR_DELAY_FRACONE},
max_length);
state->IrSize = max_length;
}
namespace {
using ubyte2 = std::array<ALubyte,2>;
std::unique_ptr<HrtfStore> CreateHrtfStore(ALuint rate, ALushort irSize, const ALuint fdCount,
const ALubyte *evCount, const ALushort *distance, const ALushort *azCount,
const ALushort *irOffset, ALushort irCount, const float2 *coeffs, const ubyte2 *delays,
const char *filename)
{
std::unique_ptr<HrtfStore> Hrtf;
ALuint evTotal{std::accumulate(evCount, evCount+fdCount, 0u)};
size_t total{sizeof(HrtfStore)};
total = RoundUp(total, alignof(HrtfStore::Field)); /* Align for field infos */
total += sizeof(HrtfStore::Field)*fdCount;
total = RoundUp(total, alignof(HrtfStore::Elevation)); /* Align for elevation infos */
total += sizeof(Hrtf->elev[0])*evTotal;
total = RoundUp(total, 16); /* Align for coefficients using SIMD */
total += sizeof(Hrtf->coeffs[0])*irCount;
total += sizeof(Hrtf->delays[0])*irCount;
Hrtf.reset(new (al_calloc(16, total)) HrtfStore{});
if(!Hrtf)
ERR("Out of memory allocating storage for %s.\n", filename);
else
{
InitRef(Hrtf->mRef, 1u);
Hrtf->sampleRate = rate;
Hrtf->irSize = irSize;
Hrtf->fdCount = fdCount;
/* Set up pointers to storage following the main HRTF struct. */
char *base = reinterpret_cast<char*>(Hrtf.get());
uintptr_t offset = sizeof(HrtfStore);
offset = RoundUp(offset, alignof(HrtfStore::Field)); /* Align for field infos */
auto field_ = reinterpret_cast<HrtfStore::Field*>(base + offset);
offset += sizeof(field_[0])*fdCount;
offset = RoundUp(offset, alignof(HrtfStore::Elevation)); /* Align for elevation infos */
auto elev_ = reinterpret_cast<HrtfStore::Elevation*>(base + offset);
offset += sizeof(elev_[0])*evTotal;
offset = RoundUp(offset, 16); /* Align for coefficients using SIMD */
auto coeffs_ = reinterpret_cast<HrirArray*>(base + offset);
offset += sizeof(coeffs_[0])*irCount;
auto delays_ = reinterpret_cast<ALubyte(*)[2]>(base + offset);
offset += sizeof(delays_[0])*irCount;
assert(offset == total);
/* Copy input data to storage. */
for(ALuint i{0};i < fdCount;i++)
{
field_[i].distance = distance[i] / 1000.0f;
field_[i].evCount = evCount[i];
}
for(ALuint i{0};i < evTotal;i++)
{
elev_[i].azCount = azCount[i];
elev_[i].irOffset = irOffset[i];
}
for(ALuint i{0};i < irCount;i++)
{
for(ALuint j{0};j < ALuint{irSize};j++)
{
coeffs_[i][j][0] = coeffs[i*irSize + j][0];
coeffs_[i][j][1] = coeffs[i*irSize + j][1];
}
std::fill(coeffs_[i].begin()+irSize, coeffs_[i].end(), float2{});
}
for(ALuint i{0};i < irCount;i++)
{
delays_[i][0] = delays[i][0];
delays_[i][1] = delays[i][1];
}
/* Finally, assign the storage pointers. */
Hrtf->field = field_;
Hrtf->elev = elev_;
Hrtf->coeffs = coeffs_;
Hrtf->delays = delays_;
}
return Hrtf;
}
ALubyte GetLE_ALubyte(std::istream &data)
{
return static_cast<ALubyte>(data.get());
}
ALshort GetLE_ALshort(std::istream &data)
{
int ret = data.get();
ret |= data.get() << 8;
return static_cast<ALshort>((ret^32768) - 32768);
}
ALushort GetLE_ALushort(std::istream &data)
{
int ret = data.get();
ret |= data.get() << 8;
return static_cast<ALushort>(ret);
}
ALint GetLE_ALint24(std::istream &data)
{
int ret = data.get();
ret |= data.get() << 8;
ret |= data.get() << 16;
return (ret^8388608) - 8388608;
}
ALuint GetLE_ALuint(std::istream &data)
{
int ret = data.get();
ret |= data.get() << 8;
ret |= data.get() << 16;
ret |= data.get() << 24;
return static_cast<ALuint>(ret);
}
std::unique_ptr<HrtfStore> LoadHrtf00(std::istream &data, const char *filename)
{
ALuint rate{GetLE_ALuint(data)};
ALushort irCount{GetLE_ALushort(data)};
ALushort irSize{GetLE_ALushort(data)};
ALubyte evCount{GetLE_ALubyte(data)};
if(!data || data.eof())
{
ERR("Failed reading %s\n", filename);
return nullptr;
}
ALboolean failed{AL_FALSE};
if(irSize < MIN_IR_LENGTH || irSize > HRIR_LENGTH)
{
ERR("Unsupported HRIR size, irSize=%d (%d to %d)\n", irSize, MIN_IR_LENGTH, HRIR_LENGTH);
failed = AL_TRUE;
}
if(evCount < MIN_EV_COUNT || evCount > MAX_EV_COUNT)
{
ERR("Unsupported elevation count: evCount=%d (%d to %d)\n",
evCount, MIN_EV_COUNT, MAX_EV_COUNT);
failed = AL_TRUE;
}
if(failed)
return nullptr;
auto evOffset = al::vector<ALushort>(evCount);
for(auto &val : evOffset)
val = GetLE_ALushort(data);
if(!data || data.eof())
{
ERR("Failed reading %s\n", filename);
return nullptr;
}
for(size_t i{1};i < evCount;i++)
{
if(evOffset[i] <= evOffset[i-1])
{
ERR("Invalid evOffset: evOffset[%zu]=%d (last=%d)\n", i, evOffset[i], evOffset[i-1]);
failed = AL_TRUE;
}
}
if(irCount <= evOffset.back())
{
ERR("Invalid evOffset: evOffset[%zu]=%d (irCount=%d)\n",
evOffset.size()-1, evOffset.back(), irCount);
failed = AL_TRUE;
}
if(failed)
return nullptr;
auto azCount = al::vector<ALushort>(evCount);
for(size_t i{1};i < evCount;i++)
{
azCount[i-1] = static_cast<ALushort>(evOffset[i] - evOffset[i-1]);
if(azCount[i-1] < MIN_AZ_COUNT || azCount[i-1] > MAX_AZ_COUNT)
{
ERR("Unsupported azimuth count: azCount[%zd]=%d (%d to %d)\n",
i-1, azCount[i-1], MIN_AZ_COUNT, MAX_AZ_COUNT);
failed = AL_TRUE;
}
}
azCount.back() = static_cast<ALushort>(irCount - evOffset.back());
if(azCount.back() < MIN_AZ_COUNT || azCount.back() > MAX_AZ_COUNT)
{
ERR("Unsupported azimuth count: azCount[%zu]=%d (%d to %d)\n",
azCount.size()-1, azCount.back(), MIN_AZ_COUNT, MAX_AZ_COUNT);
failed = AL_TRUE;
}
if(failed)
return nullptr;
auto coeffs = al::vector<float2>(irSize*irCount);
auto delays = al::vector<ubyte2>(irCount);
for(auto &val : coeffs)
val[0] = GetLE_ALshort(data) / 32768.0f;
for(auto &val : delays)
val[0] = GetLE_ALubyte(data);
if(!data || data.eof())
{
ERR("Failed reading %s\n", filename);
return nullptr;
}
for(size_t i{0};i < irCount;i++)
{
if(delays[i][0] > MAX_HRIR_DELAY)
{
ERR("Invalid delays[%zd]: %d (%d)\n", i, delays[i][0], MAX_HRIR_DELAY);
failed = AL_TRUE;
}
delays[i][0] <<= HRIR_DELAY_FRACBITS;
}
if(failed)
return nullptr;
/* Mirror the left ear responses to the right ear. */
for(size_t i{0};i < evCount;i++)
{
const ALushort evoffset{evOffset[i]};
const ALushort azcount{azCount[i]};
for(size_t j{0};j < azcount;j++)
{
const size_t lidx{evoffset + j};
const size_t ridx{evoffset + ((azcount-j) % azcount)};
for(size_t k{0};k < irSize;k++)
coeffs[ridx*irSize + k][1] = coeffs[lidx*irSize + k][0];
delays[ridx][1] = delays[lidx][0];
}
}
static const ALushort distance{0};
return CreateHrtfStore(rate, irSize, 1, &evCount, &distance, azCount.data(), evOffset.data(),
irCount, coeffs.data(), delays.data(), filename);
}
std::unique_ptr<HrtfStore> LoadHrtf01(std::istream &data, const char *filename)
{
ALuint rate{GetLE_ALuint(data)};
ALushort irSize{GetLE_ALubyte(data)};
ALubyte evCount{GetLE_ALubyte(data)};
if(!data || data.eof())
{
ERR("Failed reading %s\n", filename);
return nullptr;
}
ALboolean failed{AL_FALSE};
if(irSize < MIN_IR_LENGTH || irSize > HRIR_LENGTH)
{
ERR("Unsupported HRIR size, irSize=%d (%d to %d)\n", irSize, MIN_IR_LENGTH, HRIR_LENGTH);
failed = AL_TRUE;
}
if(evCount < MIN_EV_COUNT || evCount > MAX_EV_COUNT)
{
ERR("Unsupported elevation count: evCount=%d (%d to %d)\n",
evCount, MIN_EV_COUNT, MAX_EV_COUNT);
failed = AL_TRUE;
}
if(failed)
return nullptr;
auto azCount = al::vector<ALushort>(evCount);
std::generate(azCount.begin(), azCount.end(), std::bind(GetLE_ALubyte, std::ref(data)));
if(!data || data.eof())
{
ERR("Failed reading %s\n", filename);
return nullptr;
}
for(size_t i{0};i < evCount;++i)
{
if(azCount[i] < MIN_AZ_COUNT || azCount[i] > MAX_AZ_COUNT)
{
ERR("Unsupported azimuth count: azCount[%zd]=%d (%d to %d)\n", i, azCount[i],
MIN_AZ_COUNT, MAX_AZ_COUNT);
failed = AL_TRUE;
}
}
if(failed)
return nullptr;
auto evOffset = al::vector<ALushort>(evCount);
evOffset[0] = 0;
ALushort irCount{azCount[0]};
for(size_t i{1};i < evCount;i++)
{
evOffset[i] = static_cast<ALushort>(evOffset[i-1] + azCount[i-1]);
irCount = static_cast<ALushort>(irCount + azCount[i]);
}
auto coeffs = al::vector<float2>(irSize*irCount);
auto delays = al::vector<ubyte2>(irCount);
for(auto &val : coeffs)
val[0] = GetLE_ALshort(data) / 32768.0f;
for(auto &val : delays)
val[0] = GetLE_ALubyte(data);
if(!data || data.eof())
{
ERR("Failed reading %s\n", filename);
return nullptr;
}
for(size_t i{0};i < irCount;i++)
{
if(delays[i][0] > MAX_HRIR_DELAY)
{
ERR("Invalid delays[%zd]: %d (%d)\n", i, delays[i][0], MAX_HRIR_DELAY);
failed = AL_TRUE;
}
delays[i][0] <<= HRIR_DELAY_FRACBITS;
}
if(failed)
return nullptr;
/* Mirror the left ear responses to the right ear. */
for(size_t i{0};i < evCount;i++)
{
const ALushort evoffset{evOffset[i]};
const ALushort azcount{azCount[i]};
for(size_t j{0};j < azcount;j++)
{
const size_t lidx{evoffset + j};
const size_t ridx{evoffset + ((azcount-j) % azcount)};
for(size_t k{0};k < irSize;k++)
coeffs[ridx*irSize + k][1] = coeffs[lidx*irSize + k][0];
delays[ridx][1] = delays[lidx][0];
}
}
static const ALushort distance{0};
return CreateHrtfStore(rate, irSize, 1, &evCount, &distance, azCount.data(), evOffset.data(),
irCount, coeffs.data(), delays.data(), filename);
}
std::unique_ptr<HrtfStore> LoadHrtf02(std::istream &data, const char *filename)
{
constexpr ALubyte SampleType_S16{0};
constexpr ALubyte SampleType_S24{1};
constexpr ALubyte ChanType_LeftOnly{0};
constexpr ALubyte ChanType_LeftRight{1};
ALuint rate{GetLE_ALuint(data)};
ALubyte sampleType{GetLE_ALubyte(data)};
ALubyte channelType{GetLE_ALubyte(data)};
ALushort irSize{GetLE_ALubyte(data)};
ALubyte fdCount{GetLE_ALubyte(data)};
if(!data || data.eof())
{
ERR("Failed reading %s\n", filename);
return nullptr;
}
ALboolean failed{AL_FALSE};
if(sampleType > SampleType_S24)
{
ERR("Unsupported sample type: %d\n", sampleType);
failed = AL_TRUE;
}
if(channelType > ChanType_LeftRight)
{
ERR("Unsupported channel type: %d\n", channelType);
failed = AL_TRUE;
}
if(irSize < MIN_IR_LENGTH || irSize > HRIR_LENGTH)
{
ERR("Unsupported HRIR size, irSize=%d (%d to %d)\n", irSize, MIN_IR_LENGTH, HRIR_LENGTH);
failed = AL_TRUE;
}
if(fdCount < 1 || fdCount > MAX_FD_COUNT)
{
ERR("Multiple field-depths not supported: fdCount=%d (%d to %d)\n",
fdCount, MIN_FD_COUNT, MAX_FD_COUNT);
failed = AL_TRUE;
}
if(failed)
return nullptr;
auto distance = al::vector<ALushort>(fdCount);
auto evCount = al::vector<ALubyte>(fdCount);
auto azCount = al::vector<ALushort>{};
for(size_t f{0};f < fdCount;f++)
{
distance[f] = GetLE_ALushort(data);
evCount[f] = GetLE_ALubyte(data);
if(!data || data.eof())
{
ERR("Failed reading %s\n", filename);
return nullptr;
}
if(distance[f] < MIN_FD_DISTANCE || distance[f] > MAX_FD_DISTANCE)
{
ERR("Unsupported field distance[%zu]=%d (%d to %d millimeters)\n", f, distance[f],
MIN_FD_DISTANCE, MAX_FD_DISTANCE);
failed = AL_TRUE;
}
if(f > 0 && distance[f] <= distance[f-1])
{
ERR("Field distance[%zu] is not after previous (%d > %d)\n", f, distance[f],
distance[f-1]);
failed = AL_TRUE;
}
if(evCount[f] < MIN_EV_COUNT || evCount[f] > MAX_EV_COUNT)
{
ERR("Unsupported elevation count: evCount[%zu]=%d (%d to %d)\n", f, evCount[f],
MIN_EV_COUNT, MAX_EV_COUNT);
failed = AL_TRUE;
}
if(failed)
return nullptr;
const size_t ebase{azCount.size()};
azCount.resize(ebase + evCount[f]);
std::generate(azCount.begin()+static_cast<ptrdiff_t>(ebase), azCount.end(),
std::bind(GetLE_ALubyte, std::ref(data)));
if(!data || data.eof())
{
ERR("Failed reading %s\n", filename);
return nullptr;
}
for(size_t e{0};e < evCount[f];e++)
{
if(azCount[ebase+e] < MIN_AZ_COUNT || azCount[ebase+e] > MAX_AZ_COUNT)
{
ERR("Unsupported azimuth count: azCount[%zu][%zu]=%d (%d to %d)\n", f, e,
azCount[ebase+e], MIN_AZ_COUNT, MAX_AZ_COUNT);
failed = AL_TRUE;
}
}
if(failed)
return nullptr;
}
auto evOffset = al::vector<ALushort>(azCount.size());
evOffset[0] = 0;
std::partial_sum(azCount.cbegin(), azCount.cend()-1, evOffset.begin()+1);
const auto irTotal = static_cast<ALushort>(evOffset.back() + azCount.back());
auto coeffs = al::vector<float2>(irSize*irTotal);
auto delays = al::vector<ubyte2>(irTotal);
if(channelType == ChanType_LeftOnly)
{
if(sampleType == SampleType_S16)
{
for(auto &val : coeffs)
val[0] = GetLE_ALshort(data) / 32768.0f;
}
else if(sampleType == SampleType_S24)
{
for(auto &val : coeffs)
val[0] = static_cast<float>(GetLE_ALint24(data)) / 8388608.0f;
}
for(auto &val : delays)
val[0] = GetLE_ALubyte(data);
if(!data || data.eof())
{
ERR("Failed reading %s\n", filename);
return nullptr;
}
for(size_t i{0};i < irTotal;++i)
{
if(delays[i][0] > MAX_HRIR_DELAY)
{
ERR("Invalid delays[%zu][0]: %d (%d)\n", i, delays[i][0], MAX_HRIR_DELAY);
failed = AL_TRUE;
}
delays[i][0] <<= HRIR_DELAY_FRACBITS;
}
}
else if(channelType == ChanType_LeftRight)
{
if(sampleType == SampleType_S16)
{
for(auto &val : coeffs)
{
val[0] = GetLE_ALshort(data) / 32768.0f;
val[1] = GetLE_ALshort(data) / 32768.0f;
}
}
else if(sampleType == SampleType_S24)
{
for(auto &val : coeffs)
{
val[0] = static_cast<float>(GetLE_ALint24(data)) / 8388608.0f;
val[1] = static_cast<float>(GetLE_ALint24(data)) / 8388608.0f;
}
}
for(auto &val : delays)
{
val[0] = GetLE_ALubyte(data);
val[1] = GetLE_ALubyte(data);
}
if(!data || data.eof())
{
ERR("Failed reading %s\n", filename);
return nullptr;
}
for(size_t i{0};i < irTotal;++i)
{
if(delays[i][0] > MAX_HRIR_DELAY)
{
ERR("Invalid delays[%zu][0]: %d (%d)\n", i, delays[i][0], MAX_HRIR_DELAY);
failed = AL_TRUE;
}
if(delays[i][1] > MAX_HRIR_DELAY)
{
ERR("Invalid delays[%zu][1]: %d (%d)\n", i, delays[i][1], MAX_HRIR_DELAY);
failed = AL_TRUE;
}
delays[i][0] <<= HRIR_DELAY_FRACBITS;
delays[i][1] <<= HRIR_DELAY_FRACBITS;
}
}
if(failed)
return nullptr;
if(channelType == ChanType_LeftOnly)
{
/* Mirror the left ear responses to the right ear. */
size_t ebase{0};
for(size_t f{0};f < fdCount;f++)
{
for(size_t e{0};e < evCount[f];e++)
{
const ALushort evoffset{evOffset[ebase+e]};
const ALushort azcount{azCount[ebase+e]};
for(size_t a{0};a < azcount;a++)
{
const size_t lidx{evoffset + a};
const size_t ridx{evoffset + ((azcount-a) % azcount)};
for(size_t k{0};k < irSize;k++)
coeffs[ridx*irSize + k][1] = coeffs[lidx*irSize + k][0];
delays[ridx][1] = delays[lidx][0];
}
}
ebase += evCount[f];
}
}
if(fdCount > 1)
{
auto distance_ = al::vector<ALushort>(distance.size());
auto evCount_ = al::vector<ALubyte>(evCount.size());
auto azCount_ = al::vector<ALushort>(azCount.size());
auto evOffset_ = al::vector<ALushort>(evOffset.size());
auto coeffs_ = al::vector<float2>(coeffs.size());
auto delays_ = al::vector<ubyte2>(delays.size());
/* Simple reverse for the per-field elements. */
std::reverse_copy(distance.cbegin(), distance.cend(), distance_.begin());
std::reverse_copy(evCount.cbegin(), evCount.cend(), evCount_.begin());
/* Each field has a group of elevations, which each have an azimuth
* count. Reverse the order of the groups, keeping the relative order
* of per-group azimuth counts.
*/
auto azcnt_end = azCount_.end();
auto copy_azs = [&azCount,&azcnt_end](const ptrdiff_t ebase, const ALubyte num_evs) -> ptrdiff_t
{
auto azcnt_src = azCount.begin()+ebase;
azcnt_end = std::copy_backward(azcnt_src, azcnt_src+num_evs, azcnt_end);
return ebase + num_evs;
};
std::accumulate(evCount.cbegin(), evCount.cend(), ptrdiff_t{0}, copy_azs);
assert(azCount_.begin() == azcnt_end);
/* Reestablish the IR offset for each elevation index, given the new
* ordering of elevations.
*/
evOffset_[0] = 0;
std::partial_sum(azCount_.cbegin(), azCount_.cend()-1, evOffset_.begin()+1);
/* Reverse the order of each field's group of IRs. */
auto coeffs_end = coeffs_.end();
auto delays_end = delays_.end();
auto copy_irs = [irSize,&azCount,&coeffs,&delays,&coeffs_end,&delays_end](const ptrdiff_t ebase, const ALubyte num_evs) -> ptrdiff_t
{
const ALsizei abase{std::accumulate(azCount.cbegin(), azCount.cbegin()+ebase, 0)};
const ALsizei num_azs{std::accumulate(azCount.cbegin()+ebase,
azCount.cbegin() + (ebase+num_evs), 0)};
coeffs_end = std::copy_backward(coeffs.cbegin() + abase*irSize,
coeffs.cbegin() + (abase+num_azs)*irSize, coeffs_end);
delays_end = std::copy_backward(delays.cbegin() + abase,
delays.cbegin() + (abase+num_azs), delays_end);
return ebase + num_evs;
};
std::accumulate(evCount.cbegin(), evCount.cend(), ptrdiff_t{0}, copy_irs);
assert(coeffs_.begin() == coeffs_end);
assert(delays_.begin() == delays_end);
distance = std::move(distance_);
evCount = std::move(evCount_);
azCount = std::move(azCount_);
evOffset = std::move(evOffset_);
coeffs = std::move(coeffs_);
delays = std::move(delays_);
}
return CreateHrtfStore(rate, irSize, fdCount, evCount.data(), distance.data(), azCount.data(),
evOffset.data(), irTotal, coeffs.data(), delays.data(), filename);
}
bool checkName(const std::string &name)
{
auto match_name = [&name](const HrtfEntry &entry) -> bool { return name == entry.mDispName; };
auto &enum_names = EnumeratedHrtfs;
return std::find_if(enum_names.cbegin(), enum_names.cend(), match_name) != enum_names.cend();
}
void AddFileEntry(const std::string &filename)
{
/* Check if this file has already been enumerated. */
auto enum_iter = std::find_if(EnumeratedHrtfs.cbegin(), EnumeratedHrtfs.cend(),
[&filename](const HrtfEntry &entry) -> bool
{ return entry.mFilename == filename; });
if(enum_iter != EnumeratedHrtfs.cend())
{
TRACE("Skipping duplicate file entry %s\n", filename.c_str());
return;
}
/* TODO: Get a human-readable name from the HRTF data (possibly coming in a
* format update). */
size_t namepos = filename.find_last_of('/')+1;
if(!namepos) namepos = filename.find_last_of('\\')+1;
size_t extpos{filename.find_last_of('.')};
if(extpos <= namepos) extpos = std::string::npos;
const std::string basename{(extpos == std::string::npos) ?
filename.substr(namepos) : filename.substr(namepos, extpos-namepos)};
std::string newname{basename};
int count{1};
while(checkName(newname))
{
newname = basename;
newname += " #";
newname += std::to_string(++count);
}
EnumeratedHrtfs.emplace_back(HrtfEntry{newname, filename});
const HrtfEntry &entry = EnumeratedHrtfs.back();
TRACE("Adding file entry \"%s\"\n", entry.mFilename.c_str());
}
/* Unfortunate that we have to duplicate AddFileEntry to take a memory buffer
* for input instead of opening the given filename.
*/
void AddBuiltInEntry(const std::string &dispname, ALuint residx)
{
const std::string filename{'!'+std::to_string(residx)+'_'+dispname};
auto enum_iter = std::find_if(EnumeratedHrtfs.cbegin(), EnumeratedHrtfs.cend(),
[&filename](const HrtfEntry &entry) -> bool
{ return entry.mFilename == filename; });
if(enum_iter != EnumeratedHrtfs.cend())
{
TRACE("Skipping duplicate file entry %s\n", filename.c_str());
return;
}
/* TODO: Get a human-readable name from the HRTF data (possibly coming in a
* format update). */
std::string newname{dispname};
int count{1};
while(checkName(newname))
{
newname = dispname;
newname += " #";
newname += std::to_string(++count);
}
EnumeratedHrtfs.emplace_back(HrtfEntry{newname, filename});
const HrtfEntry &entry = EnumeratedHrtfs.back();
TRACE("Adding built-in entry \"%s\"\n", entry.mFilename.c_str());
}
#define IDR_DEFAULT_HRTF_MHR 1
#ifndef ALSOFT_EMBED_HRTF_DATA
al::span<const char> GetResource(int /*name*/)
{ return {}; }
#else
#include "hrtf_default.h"
al::span<const char> GetResource(int name)
{
if(name == IDR_DEFAULT_HRTF_MHR)
return {reinterpret_cast<const char*>(hrtf_default), sizeof(hrtf_default)};
return {};
}
#endif
} // namespace
al::vector<std::string> EnumerateHrtf(const char *devname)
{
std::lock_guard<std::mutex> _{EnumeratedHrtfLock};
EnumeratedHrtfs.clear();
bool usedefaults{true};
if(auto pathopt = ConfigValueStr(devname, nullptr, "hrtf-paths"))
{
const char *pathlist{pathopt->c_str()};
while(pathlist && *pathlist)
{
const char *next, *end;
while(isspace(*pathlist) || *pathlist == ',')
pathlist++;
if(*pathlist == '\0')
continue;
next = strchr(pathlist, ',');
if(next)
end = next++;
else
{
end = pathlist + strlen(pathlist);
usedefaults = false;
}
while(end != pathlist && isspace(*(end-1)))
--end;
if(end != pathlist)
{
const std::string pname{pathlist, end};
for(const auto &fname : SearchDataFiles(".mhr", pname.c_str()))
AddFileEntry(fname);
}
pathlist = next;
}
}
if(usedefaults)
{
for(const auto &fname : SearchDataFiles(".mhr", "openal/hrtf"))
AddFileEntry(fname);
if(!GetResource(IDR_DEFAULT_HRTF_MHR).empty())
AddBuiltInEntry("Built-In HRTF", IDR_DEFAULT_HRTF_MHR);
}
al::vector<std::string> list;
list.reserve(EnumeratedHrtfs.size());
for(auto &entry : EnumeratedHrtfs)
list.emplace_back(entry.mDispName);
if(auto defhrtfopt = ConfigValueStr(devname, nullptr, "default-hrtf"))
{
auto iter = std::find(list.begin(), list.end(), *defhrtfopt);
if(iter == list.end())
WARN("Failed to find default HRTF \"%s\"\n", defhrtfopt->c_str());
else if(iter != list.begin())
std::rotate(list.begin(), iter, iter+1);
}
return list;
}
HrtfStore *GetLoadedHrtf(const std::string &name, const char *devname, const ALuint devrate)
{
std::lock_guard<std::mutex> _{EnumeratedHrtfLock};
auto entry_iter = std::find_if(EnumeratedHrtfs.cbegin(), EnumeratedHrtfs.cend(),
[&name](const HrtfEntry &entry) -> bool { return entry.mDispName == name; }
);
if(entry_iter == EnumeratedHrtfs.cend())
return nullptr;
const std::string &fname = entry_iter->mFilename;
std::lock_guard<std::mutex> __{LoadedHrtfLock};
auto hrtf_lt_fname = [](LoadedHrtf &hrtf, const std::string &filename) -> bool
{ return hrtf.mFilename < filename; };
auto handle = std::lower_bound(LoadedHrtfs.begin(), LoadedHrtfs.end(), fname, hrtf_lt_fname);
while(handle != LoadedHrtfs.end() && handle->mFilename == fname)
{
HrtfStore *hrtf{handle->mEntry.get()};
if(hrtf && hrtf->sampleRate == devrate)
{
hrtf->IncRef();
return hrtf;
}
++handle;
}
std::unique_ptr<std::istream> stream;
ALint residx{};
char ch{};
if(sscanf(fname.c_str(), "!%d%c", &residx, &ch) == 2 && ch == '_')
{
TRACE("Loading %s...\n", fname.c_str());
al::span<const char> res{GetResource(residx)};
if(res.empty())
{
ERR("Could not get resource %u, %s\n", residx, name.c_str());
return nullptr;
}
stream = al::make_unique<idstream>(res.begin(), res.end());
}
else
{
TRACE("Loading %s...\n", fname.c_str());
auto fstr = al::make_unique<al::ifstream>(fname.c_str(), std::ios::binary);
if(!fstr->is_open())
{
ERR("Could not open %s\n", fname.c_str());
return nullptr;
}
stream = std::move(fstr);
}
std::unique_ptr<HrtfStore> hrtf;
char magic[sizeof(magicMarker02)];
stream->read(magic, sizeof(magic));
if(stream->gcount() < static_cast<std::streamsize>(sizeof(magicMarker02)))
ERR("%s data is too short (%zu bytes)\n", name.c_str(), stream->gcount());
else if(memcmp(magic, magicMarker02, sizeof(magicMarker02)) == 0)
{
TRACE("Detected data set format v2\n");
hrtf = LoadHrtf02(*stream, name.c_str());
}
else if(memcmp(magic, magicMarker01, sizeof(magicMarker01)) == 0)
{
TRACE("Detected data set format v1\n");
hrtf = LoadHrtf01(*stream, name.c_str());
}
else if(memcmp(magic, magicMarker00, sizeof(magicMarker00)) == 0)
{
TRACE("Detected data set format v0\n");
hrtf = LoadHrtf00(*stream, name.c_str());
}
else
ERR("Invalid header in %s: \"%.8s\"\n", name.c_str(), magic);
stream.reset();
if(!hrtf)
{
ERR("Failed to load %s\n", name.c_str());
return nullptr;
}
if(hrtf->sampleRate != devrate)
{
/* Calculate the last elevation's index and get the total IR count. */
const size_t lastEv{std::accumulate(hrtf->field, hrtf->field+hrtf->fdCount, size_t{0},
[](const size_t curval, const HrtfStore::Field &field) noexcept -> size_t
{ return curval + field.evCount; }
) - 1};
const size_t irCount{size_t{hrtf->elev[lastEv].irOffset} + hrtf->elev[lastEv].azCount};
/* Resample all the IRs. */
std::array<std::array<double,HRIR_LENGTH>,2> inout;
PPhaseResampler rs;
rs.init(hrtf->sampleRate, devrate);
for(size_t i{0};i < irCount;++i)
{
HrirArray &coeffs = const_cast<HrirArray&>(hrtf->coeffs[i]);
for(size_t j{0};j < 2;++j)
{
std::transform(coeffs.cbegin(), coeffs.cend(), inout[0].begin(),
[j](const float2 &in) noexcept -> double { return in[j]; });
rs.process(HRIR_LENGTH, inout[0].data(), HRIR_LENGTH, inout[1].data());
for(size_t k{0};k < HRIR_LENGTH;++k)
coeffs[k][j] = static_cast<float>(inout[1][k]);
}
}
rs = {};
const ALuint srate{hrtf->sampleRate};
for(size_t i{0};i < irCount;++i)
{
for(ALubyte &delay : const_cast<ALubyte(&)[2]>(hrtf->delays[i]))
delay = static_cast<ALubyte>(minu64(MAX_HRIR_DELAY*HRIR_DELAY_FRACONE,
(uint64_t{delay}*devrate + srate/2) / srate));
}
/* Scale the IR size for the new sample rate and update the stored
* sample rate.
*/
const uint64_t newIrSize{(uint64_t{hrtf->irSize}*devrate + srate-1) / srate};
hrtf->irSize = static_cast<ALuint>(minu64(HRIR_LENGTH, newIrSize));
hrtf->sampleRate = devrate;
}
if(auto hrtfsizeopt = ConfigValueUInt(devname, nullptr, "hrtf-size"))
{
if(*hrtfsizeopt > 0 && *hrtfsizeopt < hrtf->irSize)
hrtf->irSize = maxu(*hrtfsizeopt, MIN_IR_LENGTH);
}
TRACE("Loaded HRTF %s for sample rate %uhz, %u-sample filter\n", name.c_str(),
hrtf->sampleRate, hrtf->irSize);
handle = LoadedHrtfs.emplace(handle, LoadedHrtf{fname, std::move(hrtf)});
return handle->mEntry.get();
}
void HrtfStore::IncRef()
{
auto ref = IncrementRef(mRef);
TRACE("HrtfEntry %p increasing refcount to %u\n", decltype(std::declval<void*>()){this}, ref);
}
void HrtfStore::DecRef()
{
auto ref = DecrementRef(mRef);
TRACE("HrtfEntry %p decreasing refcount to %u\n", decltype(std::declval<void*>()){this}, ref);
if(ref == 0)
{
std::lock_guard<std::mutex> _{LoadedHrtfLock};
/* Go through and remove all unused HRTFs. */
auto remove_unused = [](LoadedHrtf &hrtf) -> bool
{
HrtfStore *entry{hrtf.mEntry.get()};
if(entry && ReadRef(entry->mRef) == 0)
{
TRACE("Unloading unused HRTF %s\n", hrtf.mFilename.data());
hrtf.mEntry = nullptr;
return true;
}
return false;
};
auto iter = std::remove_if(LoadedHrtfs.begin(), LoadedHrtfs.end(), remove_unused);
LoadedHrtfs.erase(iter, LoadedHrtfs.end());
}
}