Re: PCM format restrict dilema

[James Courtier-Dutton <James@superbug.demon.co.uk>]

Paul Davis wrote:
>>I want to try and aim at 8 periods per buffer.
>>Common sense would tell me that one should be able to set the buffer 
>>size first, and then try to set the period size to buffer_size/8. But I 
> 
> 
> why don't you set the sizes based on frame counts, not time? i suspect
> you're more likely to get better results.

If the api for setting based on time it present, I would expect to be 
able to use it.

> 
> 
>>should be able to use the set_period_size_near call so that it selects 
>>the next closest value, so that I achieve a result as close as possible 
>>to what I want. This seems to fail with the current setup on some sound 
>>cards, but works with other sound cards.
> 
> 
> i hope you handle the failure to get buffer_size/8 properly ... you
> need to be willing to go all the way to buffer_size/2 before
> concluding that you can't configure the device.

I would expect to be able to use the "set_period_size_near" with 
direction +1, so if period_size=buffer_size/8 did not work, the alsa-lib 
would automatically select the next best one, even if it is 
buffer_size/2, but this seems to fail as well.

> 
> --p
> 
> 
> 

Cheers
James



-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Welcome to geek heaven.
http://thinkgeek.com/sf