libtremor fixed the problem. it seems the arm cpu was to busy with decoding ogg files thru the vorbis/ogg floating point libraries.
therefore i did the following:
1. i downloaded the sources for libtremor from the svn: [http://svn.xiph.org/trunk/Tremor/] 2. cross compiled them for my arm board 3. i also had to cross compile the SDL_mixer library again by adding the parameter "--enable-music-ogg-tremor" to the configure command
These steps finally fixed the buffer underrun problem completely.
Thanks for the help!!!
Christian
53baa24a1003021109xe1c76dekc7f390a2a851df28@mail.gmail.com, 4B8D6F02.1060608@emlix.com In-Reply-To: 4B8D6F02.1060608@emlix.com Subject: Re: [alsa-devel] ALSA SDL VORBIS playback problem Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-UI-Message-Type: mail X-UI-ATTACHMENT-ID-POSTFIX: 13a75ccc-b8f8-47b0-a4d0-35dc155c214c
-----Urspr=FCngliche Nachricht----- Von: "Daniel Glöckner" dg@emlix.com Gesendet: 02-Mar-2010 21:03:14 An: Christian Wolf wolflpz@web.de Betreff: Re: [alsa-devel] ALSA SDL VORBIS playback problem
On 03/02/2010 08:09 PM, Alex Austin wrote:
Basically, see if a straight-up pipe will buffer reasonably. If not, I suppose it's remotely possible that this is just a CPU-bound operation an=
d
it can't keep up. I can't imagine that's really the case though with that CPU.
Libvorbis uses floating point operations while on your AT91SAM9261 you have a soft-float library (or even worse FPU emulation).
Try the integer only Tremor library linked here: http://www.xiph.org/vorbis/
The API is slightly different (easier), as it can only generate S16_LE samples.
Daniel
-- =3D
Dipl.-Math. Daniel Gl=3DF6ckner, emlix GmbH, http://www.emlix.com Fon +49 551 30664-0, Fax -11, Bahnhofsallee 1b, 37081 G=3DF6ttingen, German= y Sitz der Gesellschaft: G=3DF6ttingen, Amtsgericht G=3DF6ttingen HR B 3160 Gesch=3DE4ftsf=3DFChrer: Dr. Uwe Kracke, Ust-IdNr.: DE 205 198 055
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