[alsa-devel] About Alsa arecord

Raymond Yau superquad.vortex2 at gmail.com
Mon Jan 7 04:11:51 CET 2013

> Hello!
>        There have 2 stereo ADCs support one stereo microphone and one
legacy mixer recording simultaneously, said in the document of ALC888
Datasheet .I inputed 1KHz sine wave into every pins
(Line1-R,Line1-L,MIC1-R,MIC1_L,MIC2-R,MIC2-L,LINE2-R,LINE2-L) of ALC888 by
signal genrator,and used command 'arecord -c 4 -f S16_LE -r 44100
>test.wav' recording in fedora14.but ALL audio data are recorded in channel
1,2.No any data in channel 3,4.Why?How can I record every pins audio data
in each channel?

In alc_auto_create_input_ctls , add the connection from node 0x0b of mixer
ADC as input source similar to those pin complex

Those Mic/line/CD playback volume and switches of node 0x0b affect the
signal of the new input source ”mixer”

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