[alsa-devel] ALSA SDL VORBIS playback problem

[Alex Austin]

Experiment. On the arm board:

$ oggdec myfile.ogg -o - | aplay -

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 and
it can't keep up. I can't imagine that's really the case though with that
CPU.

On Tue, Mar 2, 2010 at 11:50 AM, Christian Wolf <wolflpz at web.de> wrote:

> I'm using SDL on an ARM based board running Linux (Olimex-AT91SAM9261) . I
> successfully cross-compiled, installed and tested the libraries (SDL,
> SDL_mixer) on the system. The sound output is done thru ALSA
> (SDL_AUDIODRIVER=alsa). And the ogg file decoding thru
> libvorbis/libvorbisfile libraries.
>
> Now I'm trying to play ogg files. First I used the Mix_LoadWAV macro from
> the SDL_Mixer library for playback. This worked, but the macro decompresses
> first the complete audio file into memory and then starts the playback. Thus
> leading to a long delay before playing the music. Therefore I tried a
> different approach with the Mix_LoadMUS macro (SDL_mixer) to play the ogg
> file. This function streams the files directly from the hard-disk and avoids
> the long decoding time. Unfortunately ALSA shows several buffer under-runs
> leading to a disrupted playback. To fix this I tried different buffer sizes,
> but the problem is still existent.
>
> The code works fine on my host system, but not on the ARM target. And i'm
> not sure if these problems are caused by the ALSA lib?
>
> Any sort of help would be great!
>
> Thanks in advance
> Christian
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