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%{
****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is the build configuration utility of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************
%}
% Create mapping matrixes to convert ambisonic to different speaker layouts supported in Qt Multimedia
%
% This uses the ADT octave framework from https://bitbucket.org/ambidecodertoolbox/adt/src/master/
% to generate conversion matrixes between ambisonic formats and various speaker configurations
%
% We're generating two band conversion matrices with a cutoff frequency of 380 Herz. Filtering low
% and high frequencies differently is important to get a decent spatial reproduction. For details
% see the "Is my decoder Ambisonic?" paper (https://ambisonics.dreamhosters.com/BLaH3.pdf)
%
function adt_generate_qt()
% assume speakers are 2 meters from listener. This should avoid near-field
% effects and should work for most room setups
radius = 2;
[outfile,msg] = fopen("qambisonicdecoderdata_p.h",'w');
fprintf(outfile, "/****************************************************************************\n");
fprintf(outfile, "**\n");
fprintf(outfile, "** Copyright (C) 2016 The Qt Company Ltd.\n");
fprintf(outfile, "** Contact: https://www.qt.io/licensing/\n");
fprintf(outfile, "**\n");
fprintf(outfile, "** This file is part of the Qt Toolkit.\n");
fprintf(outfile, "**\n");
fprintf(outfile, "** $QT_BEGIN_LICENSE:LGPL$\n");
fprintf(outfile, "** Commercial License Usage\n");
fprintf(outfile, "** Licensees holding valid commercial Qt licenses may use this file in\n");
fprintf(outfile, "** accordance with the commercial license agreement provided with the\n");
fprintf(outfile, "** Software or, alternatively, in accordance with the terms contained in\n");
fprintf(outfile, "** a written agreement between you and The Qt Company. For licensing terms\n");
fprintf(outfile, "** and conditions see https://www.qt.io/terms-conditions. For further\n");
fprintf(outfile, "** information use the contact form at https://www.qt.io/contact-us.\n");
fprintf(outfile, "**\n");
fprintf(outfile, "** GNU Lesser General Public License Usage\n");
fprintf(outfile, "** Alternatively, this file may be used under the terms of the GNU Lesser\n");
fprintf(outfile, "** General Public License version 3 as published by the Free Software\n");
fprintf(outfile, "** Foundation and appearing in the file LICENSE.LGPL3 included in the\n");
fprintf(outfile, "** packaging of this file. Please review the following information to\n");
fprintf(outfile, "** ensure the GNU Lesser General Public License version 3 requirements\n");
fprintf(outfile, "** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.\n");
fprintf(outfile, "**\n");
fprintf(outfile, "** GNU General Public License Usage\n");
fprintf(outfile, "** Alternatively, this file may be used under the terms of the GNU\n");
fprintf(outfile, "** General Public License version 2.0 or (at your option) the GNU General\n");
fprintf(outfile, "** Public license version 3 or any later version approved by the KDE Free\n");
fprintf(outfile, "** Qt Foundation. The licenses are as published by the Free Software\n");
fprintf(outfile, "** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3\n");
fprintf(outfile, "** included in the packaging of this file. Please review the following\n");
fprintf(outfile, "** information to ensure the GNU General Public License requirements will\n");
fprintf(outfile, "** be met: https://www.gnu.org/licenses/gpl-2.0.html and\n");
fprintf(outfile, "** https://www.gnu.org/licenses/gpl-3.0.html.\n");
fprintf(outfile, "**\n");
fprintf(outfile, "** $QT_END_LICENSE$\n");
fprintf(outfile, "**\n");
fprintf(outfile, "****************************************************************************/\n");
fprintf(outfile, "#ifndef QAMBISONICDECODERDATA_P_H\n");
fprintf(outfile, "#define QAMBISONICDECODERDATA_P_H\n\n");
fprintf(outfile, "#include <qtmultimediaglobal_p.h>\n\n");
fprintf(outfile, "// W A R N I N G\n");
fprintf(outfile, "// -------------\n");
fprintf(outfile, "//\n");
fprintf(outfile, "// This file is not part of the Qt API. It exists purely as an\n");
fprintf(outfile, "// implementation detail. This header file may change from version to\n");
fprintf(outfile, "// version without notice, or even be removed.\n");
fprintf(outfile, "//\n");
fprintf(outfile, "// We mean it.\n");
fprintf(outfile, "//\n\n");
fprintf(outfile, "// This file is generated by the matlab/octave file adt_generate_qt.m\n");
fprintf(outfile, "// using the Ambisonic Decoder Toolbox (https://bitbucket.org/ambidecodertoolbox/adt/src/master/)\n");
fprintf(outfile, "\n\n");
fprintf(outfile, "QT_BEGIN_NAMESPACE\n\n");
% cover top/bottom and back for mono and stereo
imag_speakers = [0,0,radius; 0,0,-radius; 0,radius,0; 0,-radius,0; -radius,0,0];
% Mono, one speaker up front
S = ambi_spkr_array(...
... % array name
'mono', ...
... % coordinate codes, unit codes
... % Azimuth, Elevation, Radius; Degrees, Degrees, Meters
'AER', 'DDM', ...
... % speaker name, [azimuth, elevation, radius]
'C', [ 0, 0, radius] ...
);
createDecoders(S, imag_speakers, outfile);
% Stereo, assume -30 and 30 degree speakers
S = ambi_spkr_array(...
'stereo', ...
'AER', 'DDM', ...
'L', [ 30, 0, radius], ...
'R', [ -30, 0, radius] ...
);
createDecoders(S, imag_speakers, outfile);
S.lfeRow = 3;
S.name = "2dot1";
createDecoders(S, imag_speakers, outfile);
% cover top/bottom for surround
imag_speakers = [0,0,radius; 0,0,-radius];
% https://www.dolby.com/us/en/guide/surround-sound-speaker-setup/5-1-setup.html
% Dolby 5.1 -- F: 22-30, S: 110-120, C in same plane as F
S = ambi_spkr_array(...
'5dot0', ...
'AER', 'DDM', ...
'L', [ 30, 0, radius], ...
'R', [ -30, 0, radius], ...
'C', [ 0, 0, radius], ...
'Ls', [ 110, 0, radius], ...
'Rs', [-110, 0, radius] ...
);
createDecoders(S, imag_speakers, outfile);
S.lfeRow = 4;
S.name = "5dot1";
createDecoders(S, imag_speakers, outfile);
% https://www.dolby.com/us/en/guide/surround-sound-speaker-setup/7-1-setup.html
% Dolby 7.1 F: 22-30, S: 90-110, B: 135-150
S = ambi_spkr_array(...
... % array name
'7dot0', ...
... % coordinate codes, unit codes
... % Azimuth, Elevation, Radius; Degrees, Degrees, Meters
'AER', 'DDM', ...
... % speaker name, [azimuth, elevation, radius]
'L', [ 30, 0, radius], ...
'R', [ -30, 0, radius], ...
'C', [ 0, 0, radius], ...
'Ls', [ 90, 0, radius], ...
'Rs', [ -90, 0, radius], ...
'Lb', [ 150, 0, radius], ...
'Rb', [-150, 0, radius] ...
);
createDecoders(S, imag_speakers, outfile);
S.lfeRow = 4;
S.name = "7dot1";
createDecoders(S, imag_speakers, outfile);
fprintf(outfile, "QT_END_NAMESPACE\n\n");
fprintf(outfile, "#endif\n\n");
fclose(outfile);
end
% remove rounding errors
function m = trimMatrix(m)
for i = 1:rows(m)
for j = 1:columns(m)
if (abs(m(i, j)) < 1e-4)
m(i, j) = 0;
endif
endfor
endfor
end
function writeLFERow(outfile, m, suffix)
if (strcmp(suffix, 'hf'))
fprintf(outfile, "0.0f, "); % no need for High frequency data on the LFE channel
else
fprintf(outfile, "0.5f, ");
endif
for i = 2:columns(m)
fprintf(outfile, "0.0f, ");
endfor
fprintf(outfile, "// LFE\n");
end
function writeMatrix(outfile, level, S, M, suffix)
m = trimMatrix(M);
hasLFE = isfield(S, "lfeRow");
r = rows(m);
c = columns(m);
if (hasLFE)
r = r + 1;
endif
fprintf(outfile, "// Decoder matrix for %s, ambisonic level %d\n", S.name, level);
fprintf(outfile, "static constexpr float decoderMatrix_%s_%d_%s[%d*%d] = {\n", S.name, level, suffix, r, c);
for i = 1:rows(S.id)
fprintf(outfile, "%ff, ", m(i, :));
fprintf(outfile, "// %s\n", S.id(i, 1){1});
if (hasLFE && S.lfeRow == i + 1)
writeLFERow(outfile, m, suffix);
endif
endfor
fprintf(outfile, "};\n\n");
end
function createOneDecoder(S, imag_speakers, outfile, level)
[D,S,M,C] = ambi_run_allrad(S, level, imag_speakers, [S.name '_' int2str(level)], false, "amb", 1, 3);
writeMatrix(outfile, level, S, M.lf, "lf");
m = ambi_apply_gamma(M.hf, D.hf_gains, C);
writeMatrix(outfile, level, S, m, "hf");
end
function createDecoders(S, imag_speakers, outfile)
for level = [1:3]
createOneDecoder(S, imag_speakers, outfile, level)
endfor
end
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