I am new to Linux and ALSA. Here is what I am trying to do....
WE have two input/output pairs for audio. The 1st pair is the LineIN/LineOut and the second pair is MicIn/HpOut. On our Centaurus EVM the LineIn connected to LINE1L+ and LINE1R+ of AIC3106. The LineOut is connected to LEFT_LO= and RIGHT_LO+. Similarly the MicIn is connected to MIC3R and MIC3L, the corresponding output for this input (i.e. HpOut) is connected to HPLOUT and HPROUT. I want to be able to select either pair and play audio using the left channel. So this is what I do
LineIn/LinOut pair
./amixer sset 'Left PGA Mixer Mic3L' off
./amixer sset 'Left PGA Mixer Mic3R' off
./amixer sset 'Left PGA Mixer Line1L' on
./amixer sset 'Left PGA Mixer Line1R' on
./amixer sset 'Left HP Mixer DACL1' off
./amixer sset 'Right HP Mixer DACL1' off
./amixer sset 'Left Line Mixer DACL1' on
./amixer sset 'Right Line Mixer DACL1' on
./arecord -v --device="hw:0,0" --format=S16_LE --rate=16000 --channels=2 --period-size=160 --buffer-size=320 |\
./aplay -v --device="hw:0,0" --format=S16_LE --rate=16000 --channels=2 --period-size=160 --buffer-size=320
In this case the audio plays fine. however for the other pair when I set
MicIn/HpOut pair
./amixer sset 'Left PGA Mixer Line1L' off
./amixer sset 'Left PGA Mixer Line1R' off
./amixer sset 'Left PGA Mixer Mic3L' on
./amixer sset 'Left PGA Mixer Mic3R' on
./amixer sset 'Left Line Mixer DACL1' off
./amixer sset 'Right Line Mixer DACL1' off
./amixer sset 'Left HP Mixer DACL1' on
./amixer sset 'Right HP Mixer DACL1' on
./arecord -v --device="hw:0,0" --format=S16_LE --rate=16000 --channels=2 --period-size=160 --buffer-size=320 |\
./aplay -v --device="hw:0,0" --format=S16_LE --rate=16000 --channels=2 --period-size=160 --buffer-size=320
I get following error
arecord: main:660: audio open error: Invalid argument
aplay: playback:2455: read error
What is going wrong?
Sachin
