[Octave-bug-tracker] [bug #60888] Extend audioread() to read files where header does not specify number of samples

[Rik]

Update of bug #60888 (project octave):

                Severity:              3 - Normal => 1 - Wish               
                Priority:              5 - Normal => 3 - Low                
              Item Group: Unexpected Error or Warning => Feature Request      
 
                 Release:                   5.2.0 => dev                    
                 Summary: Cannot read a FLAC from ffmpeg that sox and VLC can
=> Extend audioread() to read files where header does not specify number of
samples

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Follow-up Comment #3:

I checked in a changeset that improves this somewhat:
http://hg.savannah.gnu.org/hgweb/octave/rev/6dc298d3261c.

If the header does not specify the number of samples then audioinfo() now
returns -1 for the TotalSamples and Duration fields to indicate that the
results are not accurate.

The function audioread() now emits a more specific error message


"audioread: malformed header does not specify number of samples"


when this situation is encountered.

The reason why Octave has a problem with the test file is just as you
suspected: the code works by creating an array of the proper size
(TotalSamples X #_of_Channels) and then filling it in.  I put a FIXME note in
the code that it would be nice to fix this by using an expandable C++ data
container and reading the file into memory in chunks.

I've changed this issue report to be a Feature Request for the behavior above.
 In the meantime, there are easy workarounds such as using sox to read the
file and write a complete header.  For example, this works


sox fftest.flac good.flac


Because there are easy workarounds I've lovered the Priority.

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