Adding missing files to convert from itaHRTF

applications/VirtualAcoustics/openDAFF/OpenDAFFv1.7/hrtfs/ITA/daffv17_convert_from_itaHRTF.m

+function daffv17_convert_from_itaHRTF( itaHRTF_obj, file_path, metadata_user )
+% Exports itaHRTF to a DAFF file
+%
+% Input:    file_path (string) [optional]
+%           user metadata (struct created with daff_add_metadata) [optional]
+%
+% Required: ITA-Toolbox, http://www.ita-toolbox.org
+%           (includes itaHRTF class)
+%
+% Output: none
+
+metadata = [];
+if nargin >= 3
+    metadata = metadata_user;
+end
+
+hrtf_variable_name = inputname( 1 );
+file_name = [ hrtf_variable_name '_' int2str( itaHRTF_obj.nSamples ) 'samples_' int2str( itaHRTF_obj.resAzimuth ) 'x' int2str(itaHRTF_obj.resElevation) '.daff'];
+if nargin >= 2
+    file_name = file_path;    
+end
+
+if nargin == 0
+    error( 'Not enough input arguments' );
+end
+
+
+%% Inject content type indicator 'ir' or 'dft' into file name
+
+ct_indicator = 'ir';
+if strcmp( itaHRTF_obj.domain, 'freq' )
+    ct_indicator = 'dft';
+end
+
+file_path_base = strsplit( file_name, '.' );
+if ~strcmp( file_path_base(end), 'daff' )
+    file_path = strjoin( [ file_path_base(:) 'v17' ct_indicator 'daff' ], '.' );
+else
+    file_path = strjoin( [ file_path_base(1:end-1) 'v17' ct_indicator 'daff' ], '.' );
+end
+
+
+%% Prepare angle ranges and resolution
+
+theta_start_deg = rad2deg( min( itaHRTF_obj.channelCoordinates.theta ) );
+theta_end_deg = rad2deg( max( itaHRTF_obj.channelCoordinates.theta ) );
+theta_num_elements = size( unique( itaHRTF_obj.channelCoordinates.theta ), 1 );
+
+phi_start_deg = rad2deg( min( mod( itaHRTF_obj.channelCoordinates.phi, 2*pi ) ) );
+phi_end_deg = rad2deg( max( mod( itaHRTF_obj.channelCoordinates.phi, 2*pi ) ) );
+phi_num_elements = size( unique( itaHRTF_obj.channelCoordinates.phi ), 1 );
+
+assert( phi_num_elements ~= 0 );
+alphares = ( phi_end_deg - phi_start_deg ) / phi_num_elements; % phi end does not cover entire circle in this case
+alphares_full_circle = ( phi_end_deg - phi_start_deg ) / ( phi_num_elements - 1 ); % phi end does not cover entire circle in this case
+if phi_end_deg + alphares_full_circle >= 360.0
+    alpharange = [ phi_start_deg ( phi_end_deg + alphares_full_circle ) ]; % Account for full circle
+    alphares = alphares_full_circle;
+else
+    alpharange = [ phi_start_deg phi_end_deg ];
+end
+
+assert( theta_num_elements ~= 0 );
+betares = ( theta_end_deg - theta_start_deg ) / ( theta_num_elements - 1 ); % phi end does not cover entire circle
+betarange = 180 - [ theta_start_deg theta_end_deg ]; % Flip poles (DAFF starts at south pole)
+
+%% Assemble metadata
+
+metadata = daffv17_add_metadata( metadata, 'Generation script', 'String', 'daffv17_convert_from_itaHRTF.m' );
+metadata = daffv17_add_metadata( metadata, 'Generation date', 'String', date );
+
+channels = 2; % this.nChannels < does not work?
+
+% Content type switcher between time domain (ir) and frequency domain (dft)
+% (requires different data functions)
+if strcmp( itaHRTF_obj.domain, 'time' )
+
+    daffv17_write('filename', file_path, ...
+               'content', 'ir', ...
+               'datafunc', @dfitaHRIR, ...
+               'channels', channels, ...
+               'alphares', alphares, ...
+               'alpharange', alpharange, ...
+               'betares', betares, ...
+               'betarange', betarange, ...
+               'orient', [ 0 0 0 ], ...
+               'metadata', metadata, ...
+               'userdata', itaHRTF_obj, ...
+               'quantization', 'float32' );
+           
+elseif strcmp( itaHRTF_obj.domain, 'freq' )
+    
+    daffv17_write('filename', file_path, ...
+               'content', 'dft', ...
+               'datafunc', @dfitaHRTF, ...
+               'channels', channels, ...
+               'alphares', alphares, ...
+               'alpharange', alpharange, ...
+               'betares', betares, ...
+               'betarange', betarange, ...
+               'orient', [ 0 0 0 ], ...
+               'metadata', metadata, ...
+               'userdata', itaHRTF_obj, ...
+               'quantization', 'float32' );
+           
+end

applications/VirtualAcoustics/openDAFF/OpenDAFFv1.7/hrtfs/ITA/dfitaHRIR.m

+function [ data, samplerate, metadata ] = dfitaHRIR( alpha, beta, itaHRTF_obj )
+
+    samplerate = itaHRTF_obj.samplingRate;    
+    
+    hrtf = itaHRTF_obj.findnearestHRTF( 180 - beta, alpha );
+    
+    % DAFF requires data alignment by multiple of 4
+    nResidual = mod( hrtf.nSamples, 4 );
+    data = [ hrtf.timeData', zeros( hrtf.nChannels, nResidual ) ];
+    
+    metadata = [];
+end

applications/VirtualAcoustics/openDAFF/OpenDAFFv1.7/hrtfs/ITA/dfitaHRTF.m

+function [ data, samplerate, isSymetric, metadata ] = dfitaHRTF( alpha, beta, itaHRTF_obj )
+
+    samplerate = itaHRTF_obj.samplingRate;   
+    isSymetric = false;
+    
+    hrtf = itaHRTF_obj.findnearestHRTF( 180 - beta, alpha );
+    
+    % DAFF requires data alignment by multiple of 4. Interpolate by zero padding
+    % in time domain
+    nResidual = mod( hrtf.nSamples, 4 );
+    if nResidual ~= 0
+        data = ifft( [ hrtf.timeData', zeros( hrtf.nChannels, nResidual ) ] );
+    else
+        data = hrtf.freqData';
+    end
+    
+    metadata = [];
+end