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Directional Audio File Format

Brought to you by: fwefers, jstienen, laspoeck

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%

% OpenDAFF

%

% File: daff_write.m

% Purpose: Writer implementation for DAFF files

% Author: Frank Wefers (Frank.Wefers@akustik.rwth-aachen.de)

%

% $Id: daff_write.m,v 1.7 2010/03/08 14:32:41 stienen Exp $

%

function [] = daff_write( varargin )

%DAFF_WRITE Create DAFF files

% ...

%

% --= General parameters =--

%

% -- Required --

%

% filename char Output filename (*.daff)

% content char Content type

% ('IR' => Impulse responses,

% 'MS' => Magnitude spectra)

% datafunc function Data function (delivers the data for a direction)

% orient vector-3 Orientation [yaw pitch roll] angles [°]

%

% -- Optional --

%

% basepath char Base path for all input files (default: none)

% metadata struct Metadata information (see daff_metadata_addKey)

%

%

% mdist Measurement distance [m]

% reference Reference value [dB]

%

%

%

%

%

%

% --= Impulse response content parameters =--

%

% samplerate Sampling rate [Hertz]

% quantization Element quantization (int16|int24|float32)

% zthreshold Detection threshold for zero-coefficients (default: -inf)

%

% Options for magnitude spectra

%

% --= Option definitions =--

% Options with logical arguments (true|false)

boolarg = {};

% Options with integer number > 0 arguments

ingzarg = {'alphapoints', 'betapoints', 'channels'};

% Options with floating point number arguments

floatarg = {'reference', 'zthreshold'};

% Options with floating point number >= 0 arguments

pfloatarg = {'alphares', 'betares', 'mdist', 'samplerate'};

floatvecarg = {'alpharange', 'betarange', 'orient'};

% Options with string parameters

strarg = {'filename', 'basepath', 'content', 'quantization'};

% Options without an argument

nonarg = {'dummy'};

% Options with one argument

onearg = [boolarg ingzarg floatarg pfloatarg floatvecarg strarg 'datafunc' 'metadata'];

% Required options

reqarg = {'filename', 'content', 'datafunc', 'channels', 'orient'};

% +------------------------------------------------+

% | |

% | Parsing and validation of input parameters |

% | |

% +------------------------------------------------+

% Parse the arguments

args = struct();

for i=1:length(nonarg), args.(nonarg{i}) = false; end

i=1;

while i<=nargin

if ~ischar(varargin{i}), error(['Parameter ' num2str(i) ': String expected']); end

key = lower(varargin{i});

i = i+1;

r = nargin-i+1; % Number of remaining arguments

switch key

case nonarg

args.(key) = true;

% Options with one argument

case onearg

if (r < 1), error(['Option ''' key ''' requires an argument']); end

args.(key) = varargin{i};

i = i+1;

otherwise

error(['Invalid option (''' key ''')']);

end

end

% Validate the arguments

for i=1:length(reqarg)

key = reqarg{i};

if ~isfield(args, key), error(['Option ''' key ''' must be specified']); end

end

for i=1:length(boolarg)

key = boolarg{i};

if isfield(args, key)

if ~islogical(args.(key))

error(['Argument for option ''' key ''' must be logical']);

else

% Type cast

args.(key) = logical( args.(key) );

end

end

end

for i=1:length(ingzarg)

key = ingzarg{i};

if isfield(args, key)

if (~isscalar(args.(key)) || ~any(isfinite(args.(key))) || ~isreal(args.(key)) || (ceil(args.(key)) ~= args.(key)) || (args.(key) <= 0))

error(['Argument for option ''' key ''' must be an integer > 0']);

else

% Type cast

args.(key) = int32( args.(key) );

end

end

end

for i=1:length(floatarg)

key = floatarg{i};

if isfield(args, key)

if (~isscalar(args.(key)) || ~any(isfinite(args.(key))) || ~isreal(args.(key)))

error(['Argument for option ''' key ''' must be a real number']);

else

% Type cast

args.(key) = double( args.(key) );

end

end

end

for i=1:length(pfloatarg)

key = pfloatarg{i};

if isfield(args, key)

if (~isscalar(args.(key)) || ~any(isfinite(args.(key))) || ~isreal(args.(key)) || (args.(key) < 0))

error(['Argument for option ''' key ''' must be a non-negative real number']);

else

% Type cast

args.(key) = double( args.(key) );

end

end

end

for i=1:length(floatvecarg)

key = floatvecarg{i};

if isfield(args, key)

if (~isvector(args.(key)) || ~any(isfinite(args.(key))) || ~isreal(args.(key)))

error(['Argument for option ''' key ''' must be a vector of real numbers']);

else

% Type cast

args.(key) = double( args.(key) );

end

end

end

for i=1:length(strarg)

key = strarg{i};

if isfield(args, key)

if (~ischar(args.(key)) || (length(args.(key)) == 0))

error(['Argument for option ''' key ''' must be a non-empty string']);

end

end

end

% More validation ;-)

% Content

args.content = upper(args.content);

switch args.content

case 'IR'

contentStr = 'Impulse responses';

contentType = 0; % DAFF_IMPULSE_RESPONSE

case 'MS'

contentStr = 'Magnitude spectra';

contentType = 1; % DAFF_MAGNITUDE_SPECTRUM

otherwise

error(['Invalid content type (' args.content ')']);

end

% Metadata

if ~isfield(args, 'metadata'), args.metadata = []; end;

% Angular ranges default values

if ~isfield(args, 'alpharange'), args.alpharange = [0 360]; end

if ~isfield(args, 'betarange'), args.betarange = [0 180]; end

% Correct angular range ordering

alphastart = min(args.alpharange);

alphaend = max(args.alpharange);

betastart = min(args.betarange);

betaend = max(args.betarange);

if ((alphastart < 0) || (alphastart > 360))

error('Alpha range values must lie within the interval [0, 360]');

end

if ((betastart < 0) || (betastart > 180))

error('Beta range values must lie within the interval [0, 180]');

end

alphaspan = alphaend - alphastart;

betaspan = betaend - betastart;

% Alpha points and resolution

if (~isfield(args, 'alphapoints') && ~isfield(args, 'alphares'))

error('You must specify ''alphapoints'' or ''alphares''');

end

if (isfield(args, 'alphapoints') && isfield(args, 'alphares'))

error('Specify either ''alphapoints'' or ''alphares'', but not both');

end

if isfield(args, 'alphares')

args.alphapoints = alphaspan / args.alphares;

if (ceil(args.alphapoints) ~= args.alphapoints)

error('Alpha range and alpha resolution are not an integer multiple')

end

else

args.alphares = alphaspan / args.alphapoints;

end

% Beta points and resolution

if (~isfield(args, 'betapoints') && ~isfield(args, 'betares'))

error('You must specify ''betapoints'' or ''betares''');

end

if (isfield(args, 'betapoints') && isfield(args, 'betares'))

error('Specify either ''betapoints'' or ''betares'', but not both');

end

if (length(args.alpharange) ~= 2)

error('Argument for ''alpharange'' must be a two element vector');

end

if (length(args.betarange) ~= 2)

error('Argument for ''betarange'' must be a two element vector');

end

if isfield(args, 'betares')

args.betapoints = (betaspan / args.betares) + 1;

if (ceil(args.betapoints) ~= args.betapoints)

error('Beta range and beta resolution are not an integer multiple')

end

else

args.betares = betaspan / (args.betapoints-1);

end

% Orientation

if (length(args.orient) ~= 3)

error('Argument for ''orient'' must be a three element vector [yaw pitch roll]');

end

% Measurement distance

if ~isfield(args, 'mdist')

fprintf('Assuming default measurement distance of 1.00 m');

args.mdist = 1;

end

% Reference

if ~isfield(args, 'reference')

fprintf('Setting reference to 1.0 (0 dB)');

args.reference = 1;

end

% Quantization

if ~isfield(args, 'quantization'), args.quantization = 'int16'; end;

if isfield(args, 'quantization')

args.quantization = lower(args.quantization);

switch args.quantization

case 'int16'

quantizationStr = '16-bit signed integer';

quantizationType = 0; % DAFF_INT16

case 'int24'

quantizationStr = '24-bit signed integer';

quantizationType = 1; % DAFF_INT24

case 'float32'

quantizationStr = '32-bit floating point';

quantizationType = 2; % DAFF_FLOAT32

otherwise

error(['Invalid quantization (' args.quantization ')']);

end

end

if strcmp(args.content, 'IR')

% Validation for IR content

% Zero-threshold (default value)

if ~isfield(args, 'zthreshold'), args.zthreshold = -inf; end;

zthreshold_value = 10^(args.zthreshold/20);

end

% Default value for base path

if ~isfield(args, 'basepath'), args.basepath = ''; end;

% DEBUG: disp( args );

% Print a summary of the information

fprintf('--= Summary =--\n');

fprintf('Content type: \t%s\n', contentStr);

fprintf('Num channels: \t%d\n', args.channels);

fprintf('Num alpha points: \t%d\n', args.alphapoints);

fprintf('Alpha range: \t[%0.1f°, %0.1f°]\n', alphastart, alphaend);

fprintf('Alpha resolution: \t%0.1f°\n', args.alphares);

fprintf('Num beta points: \t%d\n', args.betapoints);

fprintf('Beta range: \t[%0.1f°, %0.1f°]\n', betastart, betaend);

fprintf('Beta resolution: \t%0.1f°\n', args.betares);

fprintf('Measurement dist.: \t%0.2f m\n', args.mdist);

fprintf('Reference value: \t%+0.1f dB\n', args.reference);

fprintf('Orientation: \t(Y%+0.1f°, P%+0.1f°, R%+0.1f°)\n', ...

args.orient(1), args.orient(2), args.orient(3));

if strcmp(args.content, 'IR')

fprintf('Quantization: \t%s\n', quantizationStr);

fprintf('Zero threshold: \t%+0.1f dB (%0.6f)\n', args.zthreshold, zthreshold_value);

end

if strcmp(args.content, 'MS')

% Nothing yet ...

end

% +------------------------------------------------+

% | |

% | Analysis of the input data |

% | |

% +------------------------------------------------+

%

% Here we analyse all of the input data.

% It is ensured that all datasets have equal properties.

% The first dataset (for impulse responses) determines

% global properties (samplerate, filterlength)

%

props = struct();

props.numRecords = 0;

props.globalPeak = 0;

props.eff_coeffs = 0;

% Generate a list of all input files

x = cell(args.alphapoints, args.betapoints);

for b=1:args.betapoints

beta = betastart + (b-1)*args.betares;

for a=1:args.alphapoints

alpha = alphastart + (a-1)*args.alphares;

% --= Impulse responses =--

if strcmp(args.content, 'IR')

% Get the data

[data, samplerate, metadata] = args.datafunc(alpha, beta, args.basepath);

[channels, filterlength] = size(data);

if (class(data) ~= 'double')

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Data function must deliver double values') );

end

if isfield(props, 'samplerate')

if (samplerate ~= props.samplerate)

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Sampling rate does not match', alpha, beta) );

end

if (channels ~= args.channels)

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Number of channels does not match', alpha, beta) );

end

if (filterlength ~= props.filterlength)

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Filter length does not match', alpha, beta) );

end

else

% Now set the global properties, if they have not been set yet

props.samplerate = samplerate;

props.filterlength = filterlength;

props.elementsPerRecord = filterlength;

% Check filter length for 16-byte alignment

if (mod(filterlength, 4) ~= 0)

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Filter length is not a multiple of 4 (this is required for memory alignment)', alpha, beta) );

end

fprintf('Global properties: Sampling rate = %d Hz, filter length = %d\n',...

props.samplerate, props.filterlength);

end

% Determine the peak value

peak = max(max(abs(data)));

props.globalPeak = max([props.globalPeak peak]);

% Determine effective ranges of the filters

% Important: We use C-indexes here (starting with 0)

if (zthreshold_value == 0)

% No efficient storage => Full impulse responses

offsets = zeros(1, args.channels);

elengths = ones(1, args.channels)*filterlength;

else

offsets = zeros(1, args.channels);

elengths = ones(1, args.channels)*filterlength;

% Determine the effective bounds

for c=1:args.channels

[lwr, upr] = daff_effective_bounds(data(c,:), zthreshold_value);

if (lwr == -1)

% No bounds. Store everything.

offsets(c) = 0;

elengths(c) = filterlength;

else

% Keep the offset and length a modulo of 4 (16-byte alignment)

% (Note: lwr-1 => switch from Matlab indexing to C-indexing)

elen = upr-lwr+1;

offsets(c) = daff_lwrmul(lwr-1, 4);

elengths(c) = daff_uprmul(elen, 4);

end

end

end

% Update savings by hidden zeros

props.eff_coeffs = props.eff_coeffs + sum(elengths);

% Update filter offsets and effective lengths

if isfield(props, 'minFilterOffset')

props.minFilterOffset = min([props.minFilterOffset min(offsets)]);

props.maxEffectiveFilterLength = max([props.maxEffectiveFilterLength max(elengths)]);

else

props.minFilterOffset = min(offsets);

props.maxEffectiveFilterLength = max(elengths);

end

x{a,b} = struct('peak', peak, ...

'offsets', offsets, ...

'elengths', elengths, ...

'metadata', metadata, ...

'metadataIndices', zeros(channels));

% Discard the data

clear data;

end

% --= Magnitude spectra =--

if strcmp(args.content, 'MS')

% Get the data

[freqs, data, metadata] = args.datafunc(alpha, beta, args.basepath);

[channels, numfreqs] = size(data);

if (class(data) ~= 'double')

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Data function must deliver double values') );

end

if isfield(props, 'freqs')

if (freqs ~= props.freqs)

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Frequency support does not match', alpha, beta) );

end

if (channels ~= args.channels)

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Number of channels does not match', alpha, beta) );

end

else

% Checks on the frequency support

if (min(freqs) <= 0)

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Support frequencies must be greater zero', alpha, beta) );

end;

if (sort(freqs) ~= freqs)

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Support frequencies must be stricly increasing', alpha, beta) );

end

if (length(unique(freqs)) ~= length(freqs))

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Support frequencies must be unique', alpha, beta) );

end

% Now set the global properties, if they have not been set yet

props.numfreqs = numfreqs;

props.freqs = freqs;

props.elementsPerRecord = length(freqs);

fprintf('Global properties: Number of frequencies = %d\n', numfreqs);

end

% Important: Negative magnitudes are forbidden

if (min(min(data)) < 0)

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Contains negative magnitudes', alpha, beta) );

end

% Determine the peak value

peak = max(max(data));

props.globalPeak = max([props.globalPeak peak]);

x{a,b} = struct('peak', peak, ...

'metadata', metadata, ...

'metadataIndices', zeros(channels));

% Discard the data

clear data;

end

props.numRecords = props.numRecords + 1;

end

end

fprintf('Global peak: %+0.1f dB (%0.6f)\n', 20*log10(props.globalPeak), props.globalPeak);

if strcmp(args.content, 'IR')

% Calculate to overall storage saving

props.total_coeffs = args.channels * props.numRecords * filterlength;

props.zsavings = double(props.total_coeffs - props.eff_coeffs) / double(props.total_coeffs) * 100;

fprintf('Minimum filter offset: %d\n', props.minFilterOffset);

fprintf('Maximum effective filter length: %d\n', props.maxEffectiveFilterLength);

fprintf('Storage space saved: %0.1f%%\n', props.zsavings);

end

% +------------------------------------------------+

% | |

% | Writing of the output file |

% | |

% +------------------------------------------------+

% Current version = 0.1

FileFormatVersion = 0100;

% Important! 'l' -> little endian (DAFF files are always little endian)

fid = fopen(args.filename, 'wb', 'l');

fpos = struct();

%

% 1st step: Write the file header

%

if (length(args.metadata) > 0)

iNumFileBlocks = 5;

else

iNumFileBlocks = 4;

end

fwrite(fid, 'FW', 'char');

fwrite(fid, FileFormatVersion, 'int32');

fwrite(fid, iNumFileBlocks, 'int32');

% File block entries

% Note: Remember the positions for later data insertion

% Main header (FILEBLOCK_DAFF1_MAIN_HEADER = 0x0001)

fwrite(fid, hex2dec('0001'), 'int32');

fpos.MainHeaderOffset = ftell(fid);

fwrite(fid, 0, 'uint64');

fpos.MainHeaderSize = ftell(fid);

fwrite(fid, 0, 'uint64');

% Content header (FILEBLOCK_DAFF1_CONTENT_HEADER = 0x0002)

fwrite(fid, hex2dec('0002'), 'int32');

fpos.ContentHeaderOffset = ftell(fid);

fwrite(fid, 0, 'uint64');

fpos.ContentHeaderSize = ftell(fid);

fwrite(fid, 0, 'uint64');

% Record descriptor block (FILEBLOCK_DAFF1_RECORD_DESC = 0x0003)

fwrite(fid, hex2dec('0003'), 'int32');

fpos.RecordDescOffset = ftell(fid);

fwrite(fid, 0, 'uint64');

fpos.RecordDescSize = ftell(fid);

fwrite(fid, 0, 'uint64');

% Data block (FILEBLOCK_DAFF1_DATA = 0x0004)

fwrite(fid, hex2dec('0004'), 'int32');

fpos.DataOffset = ftell(fid);

fwrite(fid, 0, 'uint64');

fpos.DataSize = ftell(fid);

fwrite(fid, 0, 'uint64');

if (length(args.metadata) > 0)

% Metadata block (FILEBLOCK_DAFF1_METADATA = 0x0005)

fwrite(fid, hex2dec('0005'), 'int32');

fpos.MetadataOffset = ftell(fid);

fwrite(fid, 0, 'uint64');

fpos.MetadataSize = ftell(fid);

fwrite(fid, 0, 'uint64');

end

%

% 2nd step: Write the main header

%

MainHeaderOffset = ftell(fid);

fwrite(fid, contentType, 'int32');

fwrite(fid, quantizationType, 'int32');

fwrite(fid, args.channels, 'int32');

fwrite(fid, props.numRecords, 'int32');

fwrite(fid, props.elementsPerRecord, 'int32');

fwrite(fid, args.mdist, 'float32');

fwrite(fid, args.alphapoints, 'int32');

fwrite(fid, alphastart, 'float32');

fwrite(fid, alphaend, 'float32');

fwrite(fid, args.betapoints, 'int32');

fwrite(fid, betastart, 'float32');

fwrite(fid, betaend, 'float32');

fwrite(fid, args.orient(1), 'float32');

fwrite(fid, args.orient(2), 'float32');

fwrite(fid, args.orient(3), 'float32');

MainHeaderSize = ftell(fid) - MainHeaderOffset;

%

% 3rd step: Write the content specific header

%

ContentHeaderOffset = ftell(fid);

% --= Impulse responses =--

if strcmp(args.content, 'IR')

fwrite(fid, props.samplerate, 'float32');

fwrite(fid, args.reference, 'float32');

fwrite(fid, props.minFilterOffset, 'int32');

fwrite(fid, props.maxEffectiveFilterLength, 'int32');

end

% --= Magnitude spectra =--

if strcmp(args.content, 'MS')

% Number of frequencies

fwrite(fid, props.globalPeak, 'float32');

fwrite(fid, props.numfreqs, 'int32');

fwrite(fid, props.freqs, 'float32');

end

ContentHeaderSize = ftell(fid) - ContentHeaderOffset;

% Adjust 16-Byte alignment

nfill = mod(ftell(fid),16);

if (nfill > 0)

for i=1:(16-nfill), fwrite(fid, 0, 'uint8'); end;

end

%

% 4rd step: Write the record descriptor table

%

RecordDescOffset = ftell(fid);

% Note: Here we do not write the actual descriptors, since they are

% unknown so far. We write placeholder and insert the data later...

if strcmp(args.content, 'IR')

% Note: Each IR record desc is 4+4+4+8 Byte = 20 Byte

fwrite(fid, zeros(1, 20*props.numRecords*args.channels, 'uint8'), 'uint8');

end

if strcmp(args.content, 'MS')

% Note: Each MS record desc is 4+8=12 Byte

fwrite(fid, zeros(1, 12*props.numRecords*args.channels, 'uint8'), 'uint8');

end

RecordDescSize = ftell(fid) - RecordDescOffset;

% Adjust 16-Byte alignment

nfill = mod(ftell(fid),16);

if (nfill > 0)

for i=1:(16-nfill), fwrite(fid, 0, 'uint8'); end;

end

%

% 5th step: Write the data itself

%

DataOffset = ftell(fid);

if strcmp(args.content, 'IR')

for b=1:args.betapoints

beta = betastart + (b-1)*args.betares;

for a=1:args.alphapoints

alpha = alphastart + (a-1)*args.alphares;

% Get the data (2nd time)

[data, samplerate] = args.datafunc(alpha, beta, args.basepath);

[channels, filterlength] = size(data);

if (class(data) ~= 'double')

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Data function must deliver double values') );

end

% Clipping check

peak = max(max(abs(data)));

if (peak > 1)

warnning( sprintf('Dataset (A%0.1f°, B%0.1f°): Clipping occured (peak %0.3f)', alpha, beta, peak) );

end

x{a,b}.dataOffset = zeros(1, args.channels);

for c=1:args.channels

% Remember the offset of this records/channels data

% Important: Relative to the beginning of the data block

x{a,b}.dataOffset(c) = ftell(fid) - DataOffset;

% Effective boundaries (Matlab indices)

i1 = x{a,b}.offsets(c) + 1;

i2 = i1 + x{a,b}.elengths(c) - 1;

switch args.quantization

case 'int16'

% Dynamic range: 2^15-1 = 32767

cdata = int16( data(c,i1:i2)*32767 );

fwrite(fid, cdata, 'int16');

case 'int24'

% Dynamic range: 2^23-1 = 8388607

cdata = int32( data(c,i1:i2)*8388607 );

fwrite(fid, cdata, 'int24');

case 'float32'

fwrite(fid, data(c,i1:i2), 'float32');

end

end

end

end

end

if strcmp(args.content, 'MS')

for b=1:args.betapoints

beta = betastart + (b-1)*args.betares;

for a=1:args.alphapoints

alpha = alphastart + (a-1)*args.alphares;

% Get the data (2nd time)

[freqs, data] = args.datafunc(alpha, beta, args.basepath);

[channels, numfreqs] = size(data);

if (class(data) ~= 'double')

error( sprintf('Dataset (A%0.1f°, B%0.1f°): Data function must deliver double values') );

end

% Clipping check

peak = max(max(data));

if (peak > 1)

warning( sprintf('Dataset (A%0.1f°, B%0.1f°): Clipping occured (peak %0.3f)', alpha, beta, peak) );

end

x{a,b}.dataOffset = zeros(1, args.channels);

for c=1:args.channels

% Remember the offset of this records/channels data

% Important: Relative to the beginning of the data block

x{a,b}.dataOffset(c) = ftell(fid) - DataOffset;

fwrite(fid, data(c,:), 'float32');

end

end

end

end

DataSize = ftell(fid) - DataOffset;

%

% 6th step: Write the metadata

%

if (length(args.metadata) > 0)

MetadataOffset = ftell(fid);

% write metadata for the whole file

daff_write_metadata(fid, args.metadata);

% write metadata for each record

index = 1;

for b=1:args.betapoints

for a=1:args.alphapoints

for c=1:args.channels

if (~isempty(x{a,b}.metadata(c)))

daff_write_metadata(fid, x{a,b}.metadata(c));

x{a,b}.metadataIndices(c) = index;

index = index + 1;

end

end

end

end

MetadataSize = ftell(fid) - MetadataOffset;

end

%

% 7th step: Update the record descriptors

%

fseek(fid, RecordDescOffset, 'bof');

if strcmp(args.content, 'IR')

for b=1:args.betapoints

for a=1:args.alphapoints

for c=1:args.channels

fwrite(fid, x{a,b}.offsets(c), 'int32');

fwrite(fid, x{a,b}.elengths(c), 'int32');

fwrite(fid, x{a,b}.metadataIndices(c), 'int32'); % TODO: find metadataIndex for this record

fwrite(fid, x{a,b}.dataOffset(c), 'uint64');

% DEBUG: fprintf('Data offset alpha = %d, beta = %d, channel %d = %d\n', a, b, c, x{a,b}.dataOffset(c));

end

end

end

end

if strcmp(args.content, 'MS')

for b=1:args.betapoints

for a=1:args.alphapoints

for c=1:args.channels

fwrite(fid, x{a,b}.metadataIndices(c), 'int32'); % TODO: find metadataIndex for this record

fwrite(fid, x{a,b}.dataOffset(c), 'uint64');

end

end

end

end

%

% 8th step: Finally insert offsets and sizes into the file header

%

fseek(fid, fpos.MainHeaderOffset, 'bof');

fwrite(fid, MainHeaderOffset, 'uint64');

fseek(fid, fpos.MainHeaderSize, 'bof');

fwrite(fid, MainHeaderSize, 'uint64');

fseek(fid, fpos.ContentHeaderOffset, 'bof');

fwrite(fid, ContentHeaderOffset, 'uint64');

fseek(fid, fpos.ContentHeaderSize, 'bof');

fwrite(fid, ContentHeaderSize, 'uint64');

fseek(fid, fpos.RecordDescOffset, 'bof');

fwrite(fid, RecordDescOffset, 'uint64');

fseek(fid, fpos.RecordDescSize, 'bof');

fwrite(fid, RecordDescSize, 'uint64');

fseek(fid, fpos.DataOffset, 'bof');

fwrite(fid, DataOffset, 'uint64');

fseek(fid, fpos.DataSize, 'bof');

fwrite(fid, DataSize, 'uint64');

if (length(args.metadata) > 0)

fseek(fid, fpos.MetadataOffset, 'bof');

fwrite(fid, MetadataOffset, 'uint64');

fseek(fid, fpos.MetadataSize, 'bof');

fwrite(fid, MetadataSize, 'uint64');

end

fclose(fid);

% -----------------------------------------------------

% Some more information

fprintf('--= Summary =---------------------------------\n\n', ContentHeaderSize);

fprintf('Content header size = %d bytes\n', ContentHeaderSize);

fprintf('Record descriptor size = %d bytes\n', RecordDescSize);

fprintf('Data size = %d bytes\n', DataSize);

if (length(args.metadata) > 0)

fprintf('Metadata size = %d bytes\n', MetadataSize);

end

fprintf('\n----------------------------------------------\n\n', ContentHeaderSize);

% What we all been waiting for...

fprintf('DAFF file ''%s'' successfully written\n', args.filename);

end

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