293 lines
9.2 KiB
C++
293 lines
9.2 KiB
C++
/*
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* SOFA utility methods for inspecting SOFA file metrics and determining HRTF
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* utility compatible layouts.
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*
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* Copyright (C) 2018-2019 Christopher Fitzgerald
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* Copyright (C) 2019 Christopher Robinson
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Or visit: http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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*/
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#include "sofa-support.h"
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#include <stdio.h>
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#include <algorithm>
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#include <array>
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#include <cmath>
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#include <utility>
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#include <vector>
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#include "mysofa.h"
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namespace {
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using uint = unsigned int;
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using double3 = std::array<double,3>;
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/* Produces a sorted array of unique elements from a particular axis of the
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* triplets array. The filters are used to focus on particular coordinates
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* of other axes as necessary. The epsilons are used to constrain the
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* equality of unique elements.
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*/
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std::vector<double> GetUniquelySortedElems(const std::vector<double3> &aers, const uint axis,
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const double *const (&filters)[3], const double (&epsilons)[3])
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{
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std::vector<double> elems;
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for(const double3 &aer : aers)
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{
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const double elem{aer[axis]};
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uint j;
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for(j = 0;j < 3;j++)
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{
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if(filters[j] && std::abs(aer[j] - *filters[j]) > epsilons[j])
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break;
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}
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if(j < 3)
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continue;
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auto iter = elems.begin();
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for(;iter != elems.end();++iter)
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{
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const double delta{elem - *iter};
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if(delta > epsilons[axis]) continue;
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if(delta >= -epsilons[axis]) break;
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iter = elems.emplace(iter, elem);
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break;
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}
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if(iter == elems.end())
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elems.emplace_back(elem);
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}
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return elems;
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}
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/* Given a list of azimuths, this will produce the smallest step size that can
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* uniformly cover the list. Ideally this will be over half, but in degenerate
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* cases this can fall to a minimum of 5 (the lower limit).
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*/
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double GetUniformAzimStep(const double epsilon, const std::vector<double> &elems)
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{
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if(elems.size() < 5) return 0.0;
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/* Get the maximum count possible, given the first two elements. It would
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* be impossible to have more than this since the first element must be
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* included.
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*/
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uint count{static_cast<uint>(std::ceil(360.0 / (elems[1]-elems[0])))};
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count = std::min(count, 255u);
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for(;count >= 5;--count)
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{
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/* Given the stepping value for this number of elements, check each
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* multiple to ensure there's a matching element.
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*/
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const double step{360.0 / count};
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bool good{true};
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size_t idx{1u};
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for(uint mult{1u};mult < count && good;++mult)
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{
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const double target{step*mult + elems[0]};
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while(idx < elems.size() && target-elems[idx] > epsilon)
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++idx;
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good &= (idx < elems.size()) && !(std::abs(target-elems[idx++]) > epsilon);
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}
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if(good)
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return step;
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}
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return 0.0;
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}
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/* Given a list of elevations, this will produce the smallest step size that
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* can uniformly cover the list. Ideally this will be over half, but in
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* degenerate cases this can fall to a minimum of 5 (the lower limit).
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*/
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double GetUniformElevStep(const double epsilon, std::vector<double> &elems)
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{
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if(elems.size() < 5) return 0.0;
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/* Reverse the elevations so it increments starting with -90 (flipped from
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* +90). This makes it easier to work out a proper stepping value.
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*/
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std::reverse(elems.begin(), elems.end());
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for(auto &v : elems) v *= -1.0;
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uint count{static_cast<uint>(std::ceil(180.0 / (elems[1]-elems[0])))};
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count = std::min(count, 255u);
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double ret{0.0};
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for(;count >= 5;--count)
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{
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const double step{180.0 / count};
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bool good{true};
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size_t idx{1u};
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/* Elevations don't need to match all multiples if there's not enough
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* elements to check. Missing elevations can be synthesized.
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*/
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for(uint mult{1u};mult <= count && idx < elems.size() && good;++mult)
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{
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const double target{step*mult + elems[0]};
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while(idx < elems.size() && target-elems[idx] > epsilon)
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++idx;
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good &= !(idx < elems.size()) || !(std::abs(target-elems[idx++]) > epsilon);
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}
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if(good)
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{
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ret = step;
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break;
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}
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}
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/* Re-reverse the elevations to restore the correct order. */
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for(auto &v : elems) v *= -1.0;
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std::reverse(elems.begin(), elems.end());
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return ret;
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}
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} // namespace
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const char *SofaErrorStr(int err)
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{
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switch(err)
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{
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case MYSOFA_OK: return "OK";
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case MYSOFA_INVALID_FORMAT: return "Invalid format";
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case MYSOFA_UNSUPPORTED_FORMAT: return "Unsupported format";
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case MYSOFA_INTERNAL_ERROR: return "Internal error";
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case MYSOFA_NO_MEMORY: return "Out of memory";
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case MYSOFA_READ_ERROR: return "Read error";
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}
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return "Unknown";
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}
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std::vector<SofaField> GetCompatibleLayout(const size_t m, const float *xyzs)
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{
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auto aers = std::vector<double3>(m, double3{});
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for(size_t i{0u};i < m;++i)
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{
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float vals[3]{xyzs[i*3], xyzs[i*3 + 1], xyzs[i*3 + 2]};
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mysofa_c2s(&vals[0]);
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aers[i] = {vals[0], vals[1], vals[2]};
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}
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auto radii = GetUniquelySortedElems(aers, 2, {}, {0.1, 0.1, 0.001});
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std::vector<SofaField> fds;
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fds.reserve(radii.size());
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for(const double dist : radii)
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{
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auto elevs = GetUniquelySortedElems(aers, 1, {nullptr, nullptr, &dist}, {0.1, 0.1, 0.001});
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/* Remove elevations that don't have a valid set of azimuths. */
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auto invalid_elev = [&dist,&aers](const double ev) -> bool
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{
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auto azims = GetUniquelySortedElems(aers, 0, {nullptr, &ev, &dist}, {0.1, 0.1, 0.001});
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if(std::abs(ev) > 89.999)
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return azims.size() != 1;
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if(azims.empty() || !(std::abs(azims[0]) < 0.1))
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return true;
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return GetUniformAzimStep(0.1, azims) <= 0.0;
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};
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elevs.erase(std::remove_if(elevs.begin(), elevs.end(), invalid_elev), elevs.end());
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double step{GetUniformElevStep(0.1, elevs)};
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if(step <= 0.0)
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{
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if(elevs.empty())
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fprintf(stdout, "No usable elevations on field distance %f.\n", dist);
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else
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{
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fprintf(stdout, "Non-uniform elevations on field distance %.3f.\nGot: %+.2f", dist,
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elevs[0]);
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for(size_t ei{1u};ei < elevs.size();++ei)
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fprintf(stdout, ", %+.2f", elevs[ei]);
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fputc('\n', stdout);
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}
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continue;
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}
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uint evStart{0u};
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for(uint ei{0u};ei < elevs.size();ei++)
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{
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if(!(elevs[ei] < 0.0))
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{
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fprintf(stdout, "Too many missing elevations on field distance %f.\n", dist);
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return fds;
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}
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double eif{(90.0+elevs[ei]) / step};
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const double ev_start{std::round(eif)};
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if(std::abs(eif - ev_start) < (0.1/step))
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{
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evStart = static_cast<uint>(ev_start);
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break;
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}
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}
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const auto evCount = static_cast<uint>(std::round(180.0 / step)) + 1;
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if(evCount < 5)
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{
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fprintf(stdout, "Too few uniform elevations on field distance %f.\n", dist);
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continue;
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}
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SofaField field{};
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field.mDistance = dist;
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field.mEvCount = evCount;
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field.mEvStart = evStart;
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field.mAzCounts.resize(evCount, 0u);
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auto &azCounts = field.mAzCounts;
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for(uint ei{evStart};ei < evCount;ei++)
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{
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double ev{-90.0 + ei*180.0/(evCount - 1)};
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auto azims = GetUniquelySortedElems(aers, 0, {nullptr, &ev, &dist}, {0.1, 0.1, 0.001});
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if(ei == 0 || ei == (evCount-1))
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{
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if(azims.size() != 1)
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{
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fprintf(stdout, "Non-singular poles on field distance %f.\n", dist);
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return fds;
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}
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azCounts[ei] = 1;
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}
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else
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{
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step = GetUniformAzimStep(0.1, azims);
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if(step <= 0.0)
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{
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fprintf(stdout, "Non-uniform azimuths on elevation %f, field distance %f.\n",
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ev, dist);
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return fds;
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}
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azCounts[ei] = static_cast<uint>(std::round(360.0f / step));
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}
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}
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fds.emplace_back(std::move(field));
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}
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return fds;
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}
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