Hi Pierre Habraken! On 2011.06.20 at 19:32:28 +0200, Pierre Habraken wrote next:
> I can imagine that this is a FAQ, but I could not find a clear answer : > which precise difference(s) distinguish(es) plughw and hw from each other ? > Does plughw apply sound processing that hw does not ? plughw *might* apply simple sound processing if needed, mostly channels conversion and rate conversion if required. It doesn't have to apply processing. hw doesn't support such processing only works when operating strictly in mode that audio card support. If you have device that supports only 2 channel, 16 bit 48000 mode then "hw" device won't be able to playback 2/16/44100 stream, or mono stream for example; you'll get an error when you try. But plughw will accept such streams and do the conversion. However, if you use plughw and output 2/16/48000 stream then no conversion is needed and most likely plughw won't be doing any processing. Note that using both hw and plughw can lead to specific problems, so it's best to use "default" device unless you have very specific requirements. -- Vladimir ------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev _______________________________________________ Alsa-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/alsa-user
