Read through this, and you can ask more to this guy. This guy implemented alsa-lib and lot of other things in alsa. Please copy alsa-devel@xxxxxxxxxxxxxxxx when you mail him, so that others in mailing list will also benefit. ---------- Forwarded message ---------- From: Nobin Mathew <nobin.mathew@xxxxxxxxx> Date: Jul 9, 2007 5:29 PM Subject: Writing a new plugin for ALSA To: Takashi Iwai <tiwai@xxxxxxx> Cc: ALSA devel <alsa-devel@xxxxxxxxxxxxxxxx> 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 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
