[haiku-development] Re: OpenSound media node update
- From: Stephan Assmus <superstippi@xxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Tue, 29 Apr 2008 12:25:52 +0200
Hi François,
François Revol wrote:
> I started rewriting the buffer handling of the OpenSound media node to
> use one thread per channel instead of a single thread polling each of
> them in sequence, which didn't work well with timeouts on a semaphore,
> and consumed a lot of cpu for nothing.
> It now spawns a thread for each used channel and just loops on read() or
> write() on the device, blocking when the buffer is full, letting OSS
> handle buffering and timing on its own.
> It's not yet finished but seems promising.
> It seems less prone to missing buffers, but since it just floods the
> driver there are on average many more buffers waiting, so the latency is
> higher and not yet accounted for correctly.
>
> So it should feel much smoother but not lip-sync yet. Recording should
> work as well.
I have applied your patch to my tree and also deleted the
opensound.media_addon from my local copy of the OpenSound package.
OpenSound detects an Intel HD Audio device. The sound has maybe gotten
slightly better but overall (I am sorry to say) it still sounds pretty
terrible. There are constantly small gabs between the buffers. There are no
periods of the sound sounding smooth, it is constantly bad, though easily
recognizable as the correct sound. I mean, one could almost listen to it,
it's not like it is only noise. But the gaps in/between the buffers make
for a good deal of distortion noise. Would be soo cool if you could get
this to work smoothly! From what you say in your email, I think you are on
the right track.
Best regards,
-Stephan
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