How to start record and playback at the same time.

[linhz0hz]

For my particular application, I want to write audio out and record the response from the environment at the same time, and analyze the response. So I need to have the timing of the output and input be well aligned. It seems that the non-blocking mode works better for what I want to do. Also this lead me to wonder when is does the read buffer starts to be filled? Is that when you open the device or is it the first call to read, particularly in non-blocking mode?

[ossilator]

alsa has api for stream synchronization (linking), which could be exposed in python as well. note, however, that the particular driver may not support it.