Re: [Openvortex-dev] Low bitrate samples.

[Wilfried Weissmann]

Manuel Jander wrote:
> Hi,
>
> Regarding some combinations of period and buffer size, i made some more
> finding. I found the condition under which the Aureal Vortex seems to
> get trouble on DMA transfers. I wouldn't blame the chip though.
>
> It happens when a period crosses the 4096 byte boundary. If the period
> ending boundary is exactly at 4096 bytes anything works fine.
> That is, period size (in bytes) of 4096, 2048, 1024, 512, 256, 128 etc
> bytes will never have problems. Other period size have problems when the
> total buffer exceeds 4096 bytes and the 4096 barrier is inside of a
> period.
>
> With problems, i mean clicks and echoes (short and long PCM playback
> chunks being repeated).

hmm, this sounds exactly like the problem that i had with speakfreely 
and mu-law encoding. i hope i will have some more time for debugging 
soon. i have been pretty busy lately.

bye,
wilfried

> I still don't know if this is a hardware limitation of the Aureal
> vortex, of the i386 architecture or whatever, but at least i found a
> consistent pattern.
>
> Best Regards
>
> Manuel Jander