Messages in this thread | | | Subject | Re: Possible bug, with extreme low latency audio. | Date | Wed, 02 Mar 2011 21:01:11 +0100 | From | Uwaysi Bin Kareem <> |
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On Wed, 02 Mar 2011 08:28:50 +0100, Clemens Ladisch <clemens@ladisch.de> wrote:
> Uwaysi Bin Kareem wrote: >> The other is a firewire device (Konnekt24d using FFADO, running on the >> old >> firewire stack). >> The firewire device actually plays nicely without much buffer underruns >> down to 0.363 ms latency (8x2 @ 44.1k). > > FireWire packets are sent every 125 µs; for audio, every packet contains > either zero or eight samples, and the proportion of data and no-data > packets is adjusted so that the overall rate is 44100 samples per > second. So 8x2 is the theoretical minimum. > >> However it seems to choke at 8x2 @ 96k. > > At sample rates above 48 kHz, there are 16 samples per packet (and above > 96 kHz, 32). It is not possible to use 8x2 at 96 kHz, and FFADO should > not have allowed you to try it; please file a bug there: > <http://subversion.ffado.org/report> (requires a login). > Ok, I am hitting the hardware limits. I'll inform FFADO crew about this. There are probably more bound to hit this limit, as lowlatency operation with Linux, is getting this good. A good error msg with the above information, would be good.
Best Regards, Uwaysi.
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