At Tue, 31 Jul 2007 14:33:04 +0000 (UTC), Vadim Lebedev wrote: > > Hello, > > I remember reading AC97 specs that there si possibility to configure it > in such a way, that when doing stereo capture, left input channel will get > actual MIC input and right input channel will get the copy of speaker output. > This setting is ideal for echo cancellation algorithm. > To my grand dismay i'm unable to find a doc of ALSA mixer API so i'm > unsucessuful writing code to put mixer in such mode. > Can some kind soul please contibuite a code snippet.... Choose "Mix" as the capture source will give you the loopback input for the specific channel. You can change it via amixer, for example, % amixer cset iface=MIXER,name='Capture Source' 0,5 numid=66,iface=MIXER,name='Capture Source' ; type=ENUMERATED,access=rw------,values=2,items=8 ; Item #0 'Mic' ; Item #1 'CD' ; Item #2 'Video' ; Item #3 'Aux' ; Item #4 'Line' ; Item #5 'Mix' ; Item #6 'Mix Mono' ; Item #7 'Phone' : values=0,5 Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
