On Wed, Oct 26, 2011 at 11:25:03AM +0200, Magnus Olsson wrote:
Always CC maintainers on mails and fix your mail client so that it word wraps within paragraphs for legibility.
If DMA HW supports progress counter, implement it.
This is just a basic quality of implementation issue - if the driver isn't taking advantage of the hardware the driver is obviously not doing a good job and should be improved.
If DMA HW is not supported, implement it in software (estimateposition using elapsed time since last irq). Only requires driver changes.
No, we can't do this. The pointer isn't just there for AV sync, it also gives userspace information about where the hardware is at in the buffer so we need to keep in sync with what the driver is doing.
If DMA HW is not supported, return use last irq timestamp asthe timestamp returned by snd_pcm_status_get_htstamp() . Probably requires ALSA Core changes.
This is pretty much what's happening right now, userspace should be using the period information if it doesn't have anything better.