[Alsa-user] buffer size for alsa plugin

[remu k. <rem...@gm...>]

Hi alsa team,


I need some help regarding alsa external filter plugin.

i have to create a external alsa filter plugin in which the "transfer"
function will receive the input buffer, with say size "x". but then we will
have to apply some algo on input data and the output buffer will be of size
"2x".

but this "2x" buffer when will be given to slave pligin it will only
consider "x" size of data as valid, so how can we tell the slave plugin
that the valid size is "2x"?

also similar to buffer size we have to get input sample rate as 48K, but
the output buffer of "2x" applies to 96K sample rate.

Please let us know how to implement this change of buffer size and sample
rate within the plugin and how to communicate it to the slave plugin.


Regards,
remu