mirror of https://github.com/axmolengine/axmol.git
376 lines
13 KiB
C++
376 lines
13 KiB
C++
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#include "config.h"
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#include "ambdec.h"
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#include <algorithm>
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#include <cctype>
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#include <cstddef>
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#include <iterator>
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#include <sstream>
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#include <string>
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#include "alfstream.h"
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#include "core/logging.h"
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namespace {
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template<typename T, std::size_t N>
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constexpr inline std::size_t size(const T(&)[N]) noexcept
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{ return N; }
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int readline(std::istream &f, std::string &output)
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{
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while(f.good() && f.peek() == '\n')
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f.ignore();
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return std::getline(f, output) && !output.empty();
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}
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bool read_clipped_line(std::istream &f, std::string &buffer)
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{
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while(readline(f, buffer))
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{
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std::size_t pos{0};
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while(pos < buffer.length() && std::isspace(buffer[pos]))
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pos++;
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buffer.erase(0, pos);
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std::size_t cmtpos{buffer.find_first_of('#')};
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if(cmtpos < buffer.length())
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buffer.resize(cmtpos);
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while(!buffer.empty() && std::isspace(buffer.back()))
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buffer.pop_back();
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if(!buffer.empty())
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return true;
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}
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return false;
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}
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std::string read_word(std::istream &f)
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{
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std::string ret;
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f >> ret;
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return ret;
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}
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bool is_at_end(const std::string &buffer, std::size_t endpos)
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{
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while(endpos < buffer.length() && std::isspace(buffer[endpos]))
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++endpos;
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return !(endpos < buffer.length());
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}
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al::optional<std::string> load_ambdec_speakers(AmbDecConf::SpeakerConf *spkrs,
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const std::size_t num_speakers, std::istream &f, std::string &buffer)
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{
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size_t cur_speaker{0};
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while(cur_speaker < num_speakers)
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{
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std::istringstream istr{buffer};
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std::string cmd{read_word(istr)};
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if(cmd.empty())
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{
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if(!read_clipped_line(f, buffer))
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return al::make_optional<std::string>("Unexpected end of file");
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continue;
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}
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if(cmd == "add_spkr")
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{
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AmbDecConf::SpeakerConf &spkr = spkrs[cur_speaker++];
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const size_t spkr_num{cur_speaker};
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istr >> spkr.Name;
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if(istr.fail()) WARN("Name not specified for speaker %zu\n", spkr_num);
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istr >> spkr.Distance;
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if(istr.fail()) WARN("Distance not specified for speaker %zu\n", spkr_num);
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istr >> spkr.Azimuth;
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if(istr.fail()) WARN("Azimuth not specified for speaker %zu\n", spkr_num);
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istr >> spkr.Elevation;
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if(istr.fail()) WARN("Elevation not specified for speaker %zu\n", spkr_num);
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istr >> spkr.Connection;
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if(istr.fail()) TRACE("Connection not specified for speaker %zu\n", spkr_num);
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}
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else
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return al::make_optional("Unexpected speakers command: "+cmd);
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istr.clear();
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const auto endpos = static_cast<std::size_t>(istr.tellg());
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if(!is_at_end(buffer, endpos))
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return al::make_optional("Extra junk on line: " + buffer.substr(endpos));
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buffer.clear();
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}
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return al::nullopt;
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}
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al::optional<std::string> load_ambdec_matrix(float (&gains)[MaxAmbiOrder+1],
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AmbDecConf::CoeffArray *matrix, const std::size_t maxrow, std::istream &f, std::string &buffer)
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{
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bool gotgains{false};
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std::size_t cur{0u};
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while(cur < maxrow)
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{
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std::istringstream istr{buffer};
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std::string cmd{read_word(istr)};
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if(cmd.empty())
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{
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if(!read_clipped_line(f, buffer))
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return al::make_optional<std::string>("Unexpected end of file");
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continue;
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}
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if(cmd == "order_gain")
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{
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std::size_t curgain{0u};
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float value;
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while(istr.good())
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{
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istr >> value;
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if(istr.fail()) break;
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if(!istr.eof() && !std::isspace(istr.peek()))
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return al::make_optional("Extra junk on gain "+std::to_string(curgain+1)+": "+
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buffer.substr(static_cast<std::size_t>(istr.tellg())));
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if(curgain < size(gains))
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gains[curgain++] = value;
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}
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std::fill(std::begin(gains)+curgain, std::end(gains), 0.0f);
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gotgains = true;
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}
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else if(cmd == "add_row")
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{
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AmbDecConf::CoeffArray &mtxrow = matrix[cur++];
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std::size_t curidx{0u};
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float value{};
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while(istr.good())
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{
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istr >> value;
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if(istr.fail()) break;
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if(!istr.eof() && !std::isspace(istr.peek()))
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return al::make_optional("Extra junk on matrix element "+
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std::to_string(curidx)+"x"+std::to_string(cur-1)+": "+
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buffer.substr(static_cast<std::size_t>(istr.tellg())));
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if(curidx < mtxrow.size())
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mtxrow[curidx++] = value;
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}
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std::fill(mtxrow.begin()+curidx, mtxrow.end(), 0.0f);
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}
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else
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return al::make_optional("Unexpected matrix command: "+cmd);
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istr.clear();
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const auto endpos = static_cast<std::size_t>(istr.tellg());
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if(!is_at_end(buffer, endpos))
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return al::make_optional("Extra junk on line: " + buffer.substr(endpos));
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buffer.clear();
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}
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if(!gotgains)
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return al::make_optional<std::string>("Matrix order_gain not specified");
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return al::nullopt;
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}
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} // namespace
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al::optional<std::string> AmbDecConf::load(const char *fname) noexcept
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{
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al::ifstream f{fname};
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if(!f.is_open())
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return al::make_optional<std::string>("Failed to open file");
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bool speakers_loaded{false};
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bool matrix_loaded{false};
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bool lfmatrix_loaded{false};
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std::string buffer;
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while(read_clipped_line(f, buffer))
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{
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std::istringstream istr{buffer};
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std::string command{read_word(istr)};
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if(command.empty())
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return al::make_optional("Malformed line: "+buffer);
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if(command == "/description")
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istr >> Description;
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else if(command == "/version")
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{
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istr >> Version;
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if(!istr.eof() && !std::isspace(istr.peek()))
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return al::make_optional("Extra junk after version: " +
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buffer.substr(static_cast<std::size_t>(istr.tellg())));
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if(Version != 3)
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return al::make_optional("Unsupported version: "+std::to_string(Version));
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}
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else if(command == "/dec/chan_mask")
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{
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if(ChanMask)
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return al::make_optional<std::string>("Duplicate chan_mask definition");
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istr >> std::hex >> ChanMask >> std::dec;
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if(!istr.eof() && !std::isspace(istr.peek()))
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return al::make_optional("Extra junk after mask: " +
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buffer.substr(static_cast<std::size_t>(istr.tellg())));
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if(!ChanMask)
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return al::make_optional("Invalid chan_mask: "+std::to_string(ChanMask));
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}
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else if(command == "/dec/freq_bands")
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{
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if(FreqBands)
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return al::make_optional<std::string>("Duplicate freq_bands");
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istr >> FreqBands;
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if(!istr.eof() && !std::isspace(istr.peek()))
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return al::make_optional("Extra junk after freq_bands: " +
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buffer.substr(static_cast<std::size_t>(istr.tellg())));
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if(FreqBands != 1 && FreqBands != 2)
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return al::make_optional("Invalid freq_bands: "+std::to_string(FreqBands));
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}
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else if(command == "/dec/speakers")
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{
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if(NumSpeakers)
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return al::make_optional<std::string>("Duplicate speakers");
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istr >> NumSpeakers;
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if(!istr.eof() && !std::isspace(istr.peek()))
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return al::make_optional("Extra junk after speakers: " +
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buffer.substr(static_cast<std::size_t>(istr.tellg())));
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if(!NumSpeakers)
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return al::make_optional("Invalid speakers: "+std::to_string(NumSpeakers));
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Speakers = std::make_unique<SpeakerConf[]>(NumSpeakers);
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}
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else if(command == "/dec/coeff_scale")
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{
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std::string scale = read_word(istr);
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if(scale == "n3d") CoeffScale = AmbDecScale::N3D;
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else if(scale == "sn3d") CoeffScale = AmbDecScale::SN3D;
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else if(scale == "fuma") CoeffScale = AmbDecScale::FuMa;
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else
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return al::make_optional("Unexpected coeff_scale: "+scale);
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}
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else if(command == "/opt/xover_freq")
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{
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istr >> XOverFreq;
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if(!istr.eof() && !std::isspace(istr.peek()))
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return al::make_optional("Extra junk after xover_freq: " +
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buffer.substr(static_cast<std::size_t>(istr.tellg())));
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}
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else if(command == "/opt/xover_ratio")
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{
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istr >> XOverRatio;
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if(!istr.eof() && !std::isspace(istr.peek()))
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return al::make_optional("Extra junk after xover_ratio: " +
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buffer.substr(static_cast<std::size_t>(istr.tellg())));
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}
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else if(command == "/opt/input_scale" || command == "/opt/nfeff_comp" ||
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command == "/opt/delay_comp" || command == "/opt/level_comp")
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{
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/* Unused */
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read_word(istr);
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}
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else if(command == "/speakers/{")
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{
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if(!NumSpeakers)
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return al::make_optional<std::string>("Speakers defined without a count");
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const auto endpos = static_cast<std::size_t>(istr.tellg());
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if(!is_at_end(buffer, endpos))
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return al::make_optional("Extra junk on line: " + buffer.substr(endpos));
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buffer.clear();
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if(auto err = load_ambdec_speakers(Speakers.get(), NumSpeakers, f, buffer))
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return err;
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speakers_loaded = true;
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if(!read_clipped_line(f, buffer))
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return al::make_optional<std::string>("Unexpected end of file");
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std::istringstream istr2{buffer};
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std::string endmark{read_word(istr2)};
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if(endmark != "/}")
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return al::make_optional("Expected /} after speaker definitions, got "+endmark);
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istr.swap(istr2);
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}
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else if(command == "/lfmatrix/{" || command == "/hfmatrix/{" || command == "/matrix/{")
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{
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if(!NumSpeakers)
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return al::make_optional<std::string>("Matrix defined without a count");
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const auto endpos = static_cast<std::size_t>(istr.tellg());
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if(!is_at_end(buffer, endpos))
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return al::make_optional("Extra junk on line: " + buffer.substr(endpos));
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buffer.clear();
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if(!Matrix)
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{
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Matrix = std::make_unique<CoeffArray[]>(NumSpeakers * FreqBands);
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LFMatrix = Matrix.get();
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HFMatrix = LFMatrix + NumSpeakers*(FreqBands-1);
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}
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if(FreqBands == 1)
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{
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if(command != "/matrix/{")
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return al::make_optional(
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"Unexpected \""+command+"\" type for a single-band decoder");
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if(auto err = load_ambdec_matrix(HFOrderGain, HFMatrix, NumSpeakers, f, buffer))
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return err;
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matrix_loaded = true;
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}
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else
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{
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if(command == "/lfmatrix/{")
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{
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if(auto err=load_ambdec_matrix(LFOrderGain, LFMatrix, NumSpeakers, f, buffer))
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return err;
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lfmatrix_loaded = true;
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}
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else if(command == "/hfmatrix/{")
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{
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if(auto err=load_ambdec_matrix(HFOrderGain, HFMatrix, NumSpeakers, f, buffer))
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return err;
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matrix_loaded = true;
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}
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else
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return al::make_optional(
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"Unexpected \""+command+"\" type for a dual-band decoder");
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}
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if(!read_clipped_line(f, buffer))
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return al::make_optional<std::string>("Unexpected end of file");
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std::istringstream istr2{buffer};
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std::string endmark{read_word(istr2)};
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if(endmark != "/}")
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return al::make_optional("Expected /} after matrix definitions, got "+endmark);
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istr.swap(istr2);
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}
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else if(command == "/end")
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{
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const auto endpos = static_cast<std::size_t>(istr.tellg());
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if(!is_at_end(buffer, endpos))
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return al::make_optional("Extra junk on end: " + buffer.substr(endpos));
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if(!speakers_loaded || !matrix_loaded || (FreqBands == 2 && !lfmatrix_loaded))
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return al::make_optional<std::string>("No decoder defined");
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return al::nullopt;
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}
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else
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return al::make_optional("Unexpected command: " + command);
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istr.clear();
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const auto endpos = static_cast<std::size_t>(istr.tellg());
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if(!is_at_end(buffer, endpos))
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return al::make_optional("Extra junk on line: " + buffer.substr(endpos));
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buffer.clear();
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}
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return al::make_optional<std::string>("Unexpected end of file");
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}
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