Re: [linux-audio-dev] Total latency measurement tool

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Subject: Re: [linux-audio-dev] Total latency measurement tool
From: Paul Barton-Davis (pbd_AT_Op.Net)
Date: ke marras 10 1999 - 01:22:11 EST


>I get 26 samples regardless of sample rate with the PCI128 and the
>kernel driver. That is, all measurable latency seems to be in the
>digital filters in the CODEC, and/or the driver + DMA.
>
>(I have a problem with ALSA and input, so I can't get reliable
>results with it. Discovered that when running the audio input through
>the "reverb" in my softsynth... The same full duplex code.)

what does reliable mean ? for example, is this "stable" ?

Delay: 61 samples
Delay: 45 samples
Delay: 49 samples
Delay: 49 samples
Delay: 73 samples
Delay: 56 samples
Delay: 72 samples
Delay: 60 samples
Delay: 72 samples
Delay: 67 samples
Delay: 76 samples
Delay: 43 samples
Delay: 69 samples
Delay: 62 samples
Delay: 80 samples
Delay: 56 samples
Delay: 57 samples
Delay: 51 samples
Delay: 48 samples
Delay: 56 samples
Delay: 63 samples
Delay: 47 samples
Delay: 56 samples
Delay: 67 samples
Delay: 43 samples
Delay: 41 samples
Delay: 56 samples
Delay: 66 samples
Delay: 57 samples
Delay: 56 samples

if not, its a bug in ALSA 0.5.0 (OSS emulation?) that needs to be fixed.

--p


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