[pulseaudio-discuss] What is latency? And other related questions

Lennart Poettering lennart at poettering.net
Tue Feb 16 17:10:22 PST 2010

On Sun, 14.02.10 11:13, David Henningsson (launchpad.web at epost.diwic.se) wrote:

> Tristin Celestin wrote:
> > Is there a downside to making a version of pa_stream_writable_size available in the
> > simple API? 
> Good question. In your use case, can see the use for a function
> returning how many bytes that can be written to pa_simple_write without
> pa_simple_write blocking.
> > Why would I want to specify the buffer attributes in the simple API with
> > a buffer_attr, but not be able to query the state of the buffer while writing to it?
> If there is no free space in the buffer, the simple API blocks until all
> data you send to it has been written to the buffer. This is a good
> approach for some applications, although your app doesn't seem to be one
> of them. Perhaps it is a PA design decision that apps that don't want
> pa_simple_write to block, shouldn't use the simple API, I don't
> know.

Yes, that is exactly the case. The simple API is supposed to be a
simplified, synchronous version of the complex, asynchronous API.

_writable_size() only really makes sense in an asynchronous API. WHich
is why I see no point in adding it to the simple API.


Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net
http://0pointer.net/lennart/           GnuPG 0x1A015CC4

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