Bug#762571: audacity: Hang when asked to open Ogg Theora file

[Martin Steghöfer]

reassign 762571 libvorbisfile3
thanks


Thanks for the bug report! I reproduced the problem in several versions 
of Debian and Ubuntu.

However, the problem isn't in audacity, but in libvorbis. The file 
importer calls libvorbis' function "ov_pcm_seek" with seek position 0 in 
order to start reading at a well-defined position. But libvorbis seems 
to have problems with seeking to 0 in certain files.

This is a known problem in libvorbis and has been fixed in r19159 of 
their trunk 3 months ago:
https://trac.xiph.org/changeset/19159
https://trac.xiph.org/ticket/1486

Maybe the changeset can be backported to the libvorbis versions 
currently in the repositories? Backporting it is trivial, at least to 
the packages of libvorbis-1.3.2 the patch applies without modifications 
(using only fuzz). I just tried it and indeed it fixed the problem with 
audacity.

Cheers,
Martin



El 23/09/14 a les 11:21, Petter Reinholdtsen ha escrit:
> Package: audacity
> Version: 2.0.1-1
>
> Hi.  I discovered this issue in Jessie (version 2.0.5-2), but it is also
> present in Wheezy.  In the KDE file manager, any Ogg Theora video file
> is passed to audacity by default (see bug #762561 for that story), and
> the audacity program just hang after showing two empty windows.
>
> I tried to install the audacity-dbg package and triggering this hang in
> gdb to get a backtrace:
>
> [New Thread 0x7fffd90f7700 (LWP 31725)]
> Expression 'stream->playback.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4541
> [Thread 0x7fffd90f7700 (LWP 31725) exited]
> [New Thread 0x7fffd90f7700 (LWP 31726)]
> Expression 'stream->playback.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4541
> [Thread 0x7fffd90f7700 (LWP 31726) exited]
> Expression '*idev = open( idevName, flags )' failed in 'src/hostapi/oss/pa_unix_oss.c', line: 811
> Expression 'OpenDevices( idevName, odevName, &idev, &odev )' failed in 'src/hostapi/oss/pa_unix_oss.c', line: 857
> Expression 'PaOssStream_Initialize( stream, inputParameters, outputParameters, streamCallback, userData, streamFlags, ossHostApi )' failed in 'src/hostapi/oss/pa_unix_oss.c', line: 1234
> ^C
> Program received signal SIGINT, Interrupt.
> 0x00007ffff103cebd in lseek64 () at ../sysdeps/unix/syscall-template.S:82
> 82      ../sysdeps/unix/syscall-template.S: No such file or directory.
> (gdb) bt
> #0  0x00007ffff103cebd in lseek64 () at ../sysdeps/unix/syscall-template.S:82
> #1  0x00007ffff0fd3fa8 in _IO_new_file_seekoff (fp=0x1541bc0, offset=0, dir=0, mode=3) at fileops.c:1122
> #2  0x00007ffff0fcc7da in *__GI_fseek (fp=0x1541bc0, offset=0, whence=0) at fseek.c:41
> #3  0x00007ffff65e0a14 in ?? () from /usr/lib/x86_64-linux-gnu/libvorbisfile.so.3
> #4  0x00007ffff65e2a5d in ov_pcm_seek_page () from /usr/lib/x86_64-linux-gnu/libvorbisfile.so.3
> #5  0x00007ffff65e2cf9 in ov_pcm_seek () from /usr/lib/x86_64-linux-gnu/libvorbisfile.so.3
> #6  0x0000000000693fca in OggImportFileHandle::Import (this=0x15221e0, trackFactory=0x11d7840,
>      outTracks=<optimized out>, outNumTracks=0x7fffffffd47c, tags=0x148ad70) at import/ImportOGG.cpp:298
> #7  0x000000000068de83 in Importer::Import (this=0x1560a40, fName=..., trackFactory=0x11d7840,
>      tracks=0x7fffffffda20, tags=0x148ad70, errorMessage=...) at import/Import.cpp:521
> #8  0x00000000005a1fee in AudacityProject::Import (this=this at entry=0x111eb00, fileName=...,
>      pTrackArray=pTrackArray at entry=0x0) at Project.cpp:3473
> #9  0x00000000005a4e8e in AudacityProject::OpenFile (this=0x111eb00, fileName=..., addtohistory=true)
>      at Project.cpp:2393
> #10 0x000000000052b8ba in AudacityApp::OnInit (this=0xd4bfe0) at AudacityApp.cpp:1326
> #11 0x00007ffff6d534d4 in wxEntry(int&, wchar_t**) () from /usr/lib/x86_64-linux-gnu/libwx_baseu-2.8.so.0
> #12 0x000000000050acb2 in main (argc=2, argv=<optimized out>) at AudacityApp.cpp:639
> (gdb)
>
> The issue should be fairly easy to reproduce.  If you need a Ogg Theora
> file, the gtk-recordmydesktop package can create one for you.  It would
> be better if audacity loaded the audio of the Ogg Theora file instead of
> just hanging.
>