Re: [Alsa-user] strange period size behaviour

[Tomas C. <to...@db...>]

Clemens Ladisch wrote:
> Tomas Carnecky wrote:
>> The thing is, in my application I can't set period time to anything else 
>> than 21333 and that is, well, kinda bad.
> 
> Your application must be able to handle any period size.
> 
> Why does the period size matter at all?

My app can handle that now, but the way how I had to do it defeats the 
'zero-copy' paradigm.

The situation is this: the application requests a 16kb buffer, at 2 
channels / U16LE this makes a 4096 frames. It's a streaming buffer and 
the app writes in the data in chunks of 4096 bytes. I can't map the alsa 
mmap'ed buffer to the application (because of the different size) so I 
have to create my own temporary buffer and then copy the data to the 
mmap'ed buffer.

tom