Recorded sound is slow and crackle

[diger]

Look on the attached wav sample to hear the problem. Audio hardware is the same as in ticket #9950

[diver]

Maybe it's a dupe of #9438?

[Barrett]

I think this could be rechecked, since both tickets mentioned are solved now.

[waddlesplash]

Still happens for me on the USB audio driver.

[zelenoviy]

I have an assumption that the problem with the recording may be related to the Media Kit (more precisely, the multi audio addon). Does it really support mono (one channel)? It seems that the MediaAudioNode internal buffer size is always calculated for 2 channels. And when copying data from the driver buffer (after BUFFER_EXCHANGE), it takes up half of the internal buffer.

If you open the file attached above in an audio editor, you can see that blocks of samples alternate with blocks of silence of equal length. And from the sound you can hear that it is slowed down and stretched twice, but the sample data is not lost during transmission.

[waddlesplash]

Indeed, it was MultiAudioNode that was the problem. Fixed in hrev57599.