[mythtv] Mac OS X video: QuickTime implementation

[Jeremiah Morris]

On 9 Sep 2004, at 3:13 AM, Nigel Pearson wrote:

> 	I am thinking of writing an audiooutputnull.cpp that would
> be invoked when the user types "none" for the audio device.
> It would make it a lot easier to test these sort of problems.

I think that's a great idea.  It could emulate a sound card buffer 
delay and report sync timing.  The main problem I foresee is that it 
the naive approach might be too perfect; part of the need for synching 
is because audio isn't usually played at precisely the correct rate.  
Maybe some drift should be added as well.

For the record, the Core Audio internal delay (the time between handing 
data to CA and hearing it through the speakers) is about 12 ms on both 
of my setups.  This leaves us in very good shape with respect to the 
recent "pause audio" thread, where Linux users are trying to cope with 
500 ms of delay.  On the contrary, coming out of pause it's the video 
that has to play catch-up.

- Jeremiah