Subject: Re: [linux-audio-dev] Linux Alsa Audio over 1394 - a Thesis
From: Martijn Sipkema (msipkema_AT_sipkema-digital.com)
Date: Wed Feb 26 2003 - 13:38:38 EET
[...]
> The bottom level packets are sent at fixed time intervals (obviously,
> corresponding to the frame clock of the bus), but these packets are tiny
> and you get millions of them per second. A useful packet of audio data
> will be made up of a bunch of these.
>
> According to the mLAN spec you need a buffer of around ~250us (depending
> on format) to collate the packets.
Still there is no guarantee that 10 packets always have exactly the same
number of samples. You say the mLAN spec says you need a buffer of
around ~250us. Note that is doesn't say a buffer of a number of frames.
The bottom line is these packets are sent at regular time intervals, not
at a fixed number of frames and thus JACK should support this by
allowing non-const (frames) callbacks IMHO.
--ms
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