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Python - pyaudio - DevTut
https://devtut.github.io/python/pyaudio.html#:~:text=1.print%20a%20traceback%20on%20standard%20error%20to%20aid,%28%29%20or%20Stream.write%20%28%29%20if%20using%20non-blocking%20operation.
PortAudio creating unnecessary threads for blocking read ...
https://github.com/PortAudio/portaudio/issues/471
PortAudio offers two methods for communicating audio data between an open Stream and your Application: (1) an asynchronous callback interface, where PortAudio calls a user defined callback function when new audio data is available or required, and (2) synchronous read and write functions which can be used in a blocking or non-blocking manner.
portaudio::PortAudio - Rust
https://docs.rs/portaudio/0.7.0/portaudio/struct.PortAudio.html
When a non-blocking stream is running, PortAudio calls the given callback periodically. The callback function is responsible for processing buffers of audio samples passed via the input and/or output parameters (depending on the Stream 's Flow ).
an Open-Source Cross-Platform Audio API - PortAudio
PortAudio provides a very simple API for recording and/or playing sound using a simple callback function or a blocking read/write interface. Example programs are included that play sine waves, process audio input (guitar fuzz), record and playback audio, list available audio devices, etc.
Blocking Read/Write Functions - PortAudio
http://portaudio.com/docs/v19-doxydocs/blocking_read_write.html
PortAudio V19 adds a huge advance over previous versions with a feature called Blocking I/O. Although it may have lower performance that the callback method described earlier in this tutorial, blocking I/O is easier to understand and is, in some cases, more compatible with third party systems than the callback method.
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