Hi,
I am trying to write a new ALSA plugin, like dmix.
My intend is to give priority to streams, i will not do up sample and down sample as we do in the case of dmix.
If we do up sample and down sample then I think it will take lot of cpu.
In my case I have three streams audio, bluetooth sco and Navigation sound data.
priority is audio < sco < Nav
audio rate is 44100hz, sco rate is 8000hz
when sco is up audio should pause playback and audio should continue when sco is finished. I dont want to do software mixing. Thats why I am trying to write this new plugin.
Assume that audio is active first, then sco comes to active state. So what i will do is in the library i will put audio app in sleep(), and re-configure the pcm for sco. Once sco is finished i will re-configure pcm for audio again like wise.
so my question is there any api in the alsa-lib to take a copy of pcm structures, so when audio comes back gain i can use these saved pcm conf to that.
Is there any api in the alsa-lib to reset the pcm structure to initialized state, means state just after open.
Thanks Nobin Mathew