From: Christian Wolf <wolflpz@web.de>
To: "Daniel Glöckner" <dg@emlix.com>
Cc: Alex Austin <circuitsoft.alex@gmail.com>, alsa-devel@alsa-project.org
Subject: Re: ALSA SDL VORBIS playback problem
Date: Tue, 9 Mar 2010 19:00:43 +0100 (CET) [thread overview]
Message-ID: <12959466.188846.1268157643906.JavaMail.fmail@mwmweb068> (raw)
In-Reply-To: 7299058.27442.1267552227471.JavaMail.fmail@mwmweb068
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
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-----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
emlix - your embedded linux partner
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prev parent reply other threads:[~2010-03-09 18:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-02 17:50 ALSA SDL VORBIS playback problem Christian Wolf
2010-03-02 19:09 ` Alex Austin
2010-03-02 20:03 ` Daniel Glöckner
2010-03-09 18:00 ` Christian Wolf [this message]
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