[Octave-bug-tracker] [bug #56889] Incorrect encoding results from uint8 vector to wav file

[imad imadero]

Follow-up Comment #7, bug #56889 (project octave):

Hi everyone,
details about the issue are depicted as follow:

the main code:

Fs=8000;
filename='test.wav'
y=ones(1,32)*256;
for k=1:32
y(k)=258-k;% some overflowing values to make sure uint8 parses all values
end
audiowrite(filename,uint8(y),Fs,'BitsPerSample',8);
yi= audioread(filename,'native');


1) we exucute this code using matlab, the file generated is named as
test.matlab.wav, it's content is showed in the hexfile editor under the name
test.matlab.wav
2) we execute the same code under Octave, the file generated is named as
test.octav.wav wich is different from the one generated by Matlab, to see the
difference looking at the byte index "44" from which the difference emerges.
3) we read the file test.matlab.wav using octave;; wrong results from
audioread as well !! the same problem ( values 0,253,254,255 are parsed to 255
and 0). audioread under matlab read the file correctly.
the output of audioread funtion using octave to read the file
test.matlab.wav:

y_matlab =

  252
  252
  252
  251
  250
  249
  248
  247
  246
  245
  244
  243
  242
  241
  240
  239
  238
  237
  236
  235
  234
  233
  232
  231
  230
  229
  228
  227
  226
  225
  224
  223

thanks every one 


(file #47516, file #47517, file #47518, file #47519)
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Additional Item Attachment:

File name: hex.matlab.png                 Size:14 KB
    <https://savannah.gnu.org/file/hex.matlab.png?file_id=47516>

File name: hex.octave.png                 Size:13 KB
    <https://savannah.gnu.org/file/hex.octave.png?file_id=47517>

File name: test.matlab.wav                Size:0 KB
    <https://savannah.gnu.org/file/test.matlab.wav?file_id=47518>

File name: test.octave.wav                Size:0 KB
    <https://savannah.gnu.org/file/test.octave.wav?file_id=47519>



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