Re: [alsa-devel] regarding setting of fragment size in usbaudio driver

Amit Nagal wrote:

i am using a OSS based usbaudio application for usb audio streaming .

my usb audio device is capture only device .

i want to set the fragment size of usbaudio alsa driver to reduce latency problem coming in my application .

currently even if my application reads 4k data from userspace , i observed driver will buffer for 100 ms data ( period size data )= 16 k at 44100 frquency

and after driver reads 16k data , read call will return with 4k data . so read() call remains blocked for 100ms which is causing some latency problem .

There is no extra buffer in the driver. There seems to be something wrong with your algorithm.

Does recording with the arecord tool work?

Regards, Clemens