On Mon, Nov 17, 2008 at 8:21 PM, Klaus Schulz kls.schlz@googlemail.comwrote:

Hi folks (probably Clemens).

Would it be possible to to introduce a module-option variable to snd-usb-audio, so that it is possible to switch minimum period from outside

usbaudio.c

/* set the period time minimum 1ms */
/* FIXME: high-speed mode allows 125us minimum period, but many parts
 * in the current code assume the 1ms period.
 */
snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
                 1000 * MIN_PACKS_URB,
                 /*(nrpacks * MAX_URBS) * 1000*/ UINT_MAX);

With 125us my EMU USB 0404 and also my PCM2707 devices do sound better.

THX \Klaus