remove plughw in alsabat test

[keqiaozhang]

Add channel and rate options support in alsabat test and
remove use of plughw to run alsabat test at hw level w/o
any conversions done by alsa-lib.

Signed-off-by: Zhang Keqiao keqiao.zhang@linux.intel.com

[marc-hb]

Sorry I don't understand why the number of channels is hardcoded for playback but not for capture.

I also find the code comment not visible enough, I think a dlogw or at the very least a dlogi warning should be printed.

[keqiaozhang]

Sorry I don't understand why the number of channels is hardcoded for playback but not for capture.

I also find the code comment not visible enough, I think a dlogw or at the very least a dlogi warning should be printed.

This script is for sof playback test, as our sof doesn't support 1 channel(mono wav) playback, so I set the channel number to 2.

Since we use different USB sound cards in CI, old USB sound cards only support 1 channel capture and new USB sound cards support 2 channels, so I set the channel number of capture as an option( -C ), we can specify it in the alsabat-playback.csv file for each platform.
We plan to buy more USB sound cards to replace the old one in CI. After that, we can remove this option and test 2 channels for both playback and capture.

[aiChaoSONG]

some usb card now support stereo channel, thanks for the fix.

[xiulipan]

@keqiaozhang Need to take care nocodec platforms, they do not use USB loopback.

[aiChaoSONG]

SOFCI TEST

[aiChaoSONG]

The failure on APL_NOCODEC is not caused by this PR, but need to fine tune.