On 17 February 2010 18:15, Lennart Poettering <mznyfn@xxxxxxxxxxx> wrote: > Heya! > > So, as some of you might know in PA we extend the abilities of the > hardware volume control in software. Meaning that if a hw mixer > control only allows a limited range or granularity of a volume scale > or does not distuingish between channels then PA will configure the > hardware to the next higher available setting of the real > volume it wants to achieve, and then attenuates the PCM stream to > compensate for the rest. > > This actually works quite well but there is a certain probelm with > latency: i.e. the mixer setting will be applied at a slightly > different time than the PCM attenuation. > > Now the question I have is, how should I best deal with this? I > currently assume that mixer volume changes are basically instantaneous > when I call the respective function of ALSA. But are they really? How > big is the latency at max? Do we need an API to query it? > > Lennart > The latency is non-deterministic. latency of the PCM stream is more predictable. I am not sure how you might get around this problem. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
