[Vorbis-dev] Sound glitch when using libvorbisfile and libao

Marshall Mason
Sun, 14 Jun 2015 05:38:10 -0000

Hi Gunter,
Thank you for your quick response. As I mentioned in the email, I cannot
dependably reproduce it. It comes and goes, and I just have to wait for it
to come up before I can try to debug it. I've found it tends to happen when
I've been taxing my sound driver, but this isn't consistent either. My
inability to consistently reproduce this has made it a nasty bug for me to
investigate.

I was hoping that something would be immediately obvious in my code to
those who know these libraries very well. I have the feeling it has
something to do with buffering. If I decode the Ogg Vorbis file and dump it
into a raw file, and then read it in again and feed it to ao_play, the
problem goes away.

I have a simple Ogg Vorbis file I am using for testing, which I sent to you
in a private email. I have no server space on which to store it.

Thanks,
Marshall

On Sat, Jun 13, 2015 at 10:14 PM, Gunter K?nigsmann <gunter at
peterpall.de>
wrote:

> How can this problem be reproduced? If you have an specific .ogg file that
> gives problems  it would be helpful to have them so we can try to reproduce
> them.
>
> Kind regards,
>
>    Gunter.
>
> On So, Jun 14, 2015 at 7:10 , Marshall Mason <marshallmason2 at
gmail.com>
> wrote:
>
> Hi there,
> I've been grappling with this for some time, so I'm finally
breaking down
> and trying this list.
>
> I'm trying to integrate libvorbisfile and libao to create a simple
sound
> file player, a la ogg123. To do this, I borrowed heavily from ao_example.c
> and vorbisfile_example.c. I feed the buffer from ov_read into ao_play in a
> simple loop. It usually works, but occasionally all it does is make a
> strange sound and quickly finishes. I cannot dependably reproduce it. The
> same problem does not happen when I use ogg123, so I'm sure I'm
doing
> something wrong. I've combed through the ogg123 source code and
couldn't
> figure it out. I'm wondering if someone can look at my code and tell me
if
> there's something I overlooked.
>
> http://pastie.org/10239629
>
> (Debian Jessie, libvorbisfile 1.3.4, libao-1.1.0)
>
> Thanks,
> Marshall
>
>
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