snd_usb_hardware definition

[Amit Nagal <helloin.amit@xxxxxxxxx>]

Hi ,

In H/W Descriptor snd_usb_hardware (sound/usb/pcm.c) , the following
values are used :

static struct snd_pcm_hardware snd_usb_hardware =
{
         ....
        .buffer_bytes_max =     1024 * 1024,
        .period_bytes_min =     64,
        .period_bytes_max =     512 * 1024,
        .periods_min =          2,
        .periods_max =          1024,
};


can i be guided what criterion is used to set the values of above
fields ( periods_min, periods_max , period_bytes_min ,
period_bytes_max , buffer_bytes_max)
as defined above for a snd usb h/w .

Regards
Amit Nagal
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