function write_test_data(x, fn, bits, fmt, fs)

% SPDX-License-Identifier: BSD-3-Clause

% Copyright(c) 2019 Intel Corporation. All rights reserved.

% Author: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

switch lower(fmt)

case 'wav'

y = double(x) / 2^(bits-1);

audiowrite(fn, y, fs, 'BitsPerSample', bits);

return;

case 'raw'

fh = fopen(fn, 'wb');

case 'txt'

fh = fopen(fn, 'w');

otherwise

error('The file format must be raw or txt');

end

switch bits

case 16

bfmt = 'int16';

case 24

bfmt = 'int32';

case 32

bfmt = 'int32';

otherwise

error('The bits must be set to 16, 24, or 32');

end

%% Interleave the channels if two or more

sx = size(x);

xi = zeros(sx(1)*sx(2), 1, bfmt);

if sx(2) > 1

for n=1:sx(2)

xi(n:sx(2):end) = x(:,n);

end

else

xi(1:end) = x;

end

%% Write file and close

if strcmp(lower(fmt), 'raw')

fwrite(fh, xi, bfmt);

else

fprintf(fh,'%d\n', xi);

end

fclose(fh);

end