[LAU] Re: Jack Frames/Period setting with Firewire

On April 7, 2025 8:36:15 PM GMT+02:00, Jay Thomas <[email protected]> wrote:
>Hello
>
>I am having difficulty setting Frames/Period for Jack at 128 to keep the
>system from having stuttering audio quality.  The highest I can go is 64
>but that is not high enough to resolve the stuttering issue.   Jack
>complains of ALSA not being able to set the parameters: "ERROR: ALSA:
>cannot set hardware parameters for capture"
>
>The driver being used is snd-fireworks.  This module has a config parameter
>called resp_buf_size that can be set to 4096 maximum.  So when I set this
>parameter to 4096, I still have trouble setting the Frames/Period in Jack
>to 128.  It would seem that one would expect that 4096 would be good enough
>since I am using an AudioFire device with 16 channels being sent over the
>FW bus.  1 sample = 4 bytes.  4 bytes x 16 channels x 128 = 4096.  So this
>figure of 4096 bytes is enough to hold 128 samples of 16 channels of audio.
>
>Is there another driver module configuration parameter that I need to
>change instead of the snd-fireworks parameter such that ALSA will be able
>to set the requested buffer size that propagates down from Jack config?
>

Hi, sorry for top-posting.

A buffer needs to hold at least two periods for jackd. And two times 64 is 128.

Regards,
FPS
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