[Octave-bug-tracker] [bug #30309] Function wavread() fails for wave files with odd-sized RIFF chunks.

[Fardan Iqbal]

URL:
  <http://savannah.gnu.org/bugs/?30309>

                 Summary: Function wavread() fails for wave files with
odd-sized RIFF chunks.
                 Project: GNU Octave
            Submitted by: fiqbal
            Submitted on: Thu 01 Jul 2010 02:28:07 AM GMT
                Category: Libraries
                Severity: 3 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Fardan Iqbal
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.3
        Operating System: GNU/Linux

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Details:

The `wavread()' function (defined in wavread.m) fails with an error message
saying "file contains no data chunk".  This happens when you try to read a
wave file that has an odd-sized RIFF chunk before the main data chunk.

After looking at wavread.m, it looks like the cause of this problem is that
the `find_chunk()' function (used by `wavread()') does not account for the
padding byte that well-formed wave files must have at the end of odd-sized
chunks.

A possible fix is to round the `chunk_size' variable up to an even number
before adding it to `offset' in the `find_chunk()' function.

Attached to this report is a wave file that demonstrates the problem.  This
file contains a 79-byte list chunk with a padding byte at the end.  Typing the
following command:

    Y = wavread("oddchunk.wav")

will cause the error.

This bug was discovered on Fedora Core 12 running on x86_64.  Octave was
configured for "x86_64-redhat-linux-gnu".



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File Attachments:


-------------------------------------------------------
Date: Thu 01 Jul 2010 02:28:07 AM GMT  Name: oddchunk.wav  Size: 454kB   By:
fiqbal

<http://savannah.gnu.org/bugs/download.php?file_id=20862>

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