Realtime CLI spectrogram example #987
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Primary purpose of this PR is to add an example to demonstrate additional way to utilize audio input stream while offering a tool to visualize the stream for many purposes. While the amount of code and features included in the spectogram example are quite complex, it may be usefull for someone like me who is just entering the world of lower level audio. Currently the code uses OS's default input device.
While developing this example I noticed that on Windows using wasapi host AGC or noise suppression comes quickly into play when visualizing realtime audio input, regardless that
build_input_stream_raw_innershould supposedly give raw audio stream if OS or driver agrees on that. To get real raw input audio on Windows with wasapi, I added feature to request raw audio stream behind new environment variable (global with OnceLock) that can be used to enable the mentioned feature. With that in place I was able to disable AGC/noice suppression on Windows 11 and get truly raw stream which allowed to run the spectrogram indefinitely without disturbance from OS/driver level filters. I did not face similar challenges on MacOS where the audiostream was seemingly untouched or atleast did not affect it at runtime. On Windows possible usecases with this could be for example longer running audio recordings where the volume and quality should stay constant, or if one would like to handle those by themselves. Windows seems to start lowering the input sound volume after certain period of inactivitySpectrogram example is briefly tested to work on real devices: Mac Mini M4 (15.5 Sequio), Linux and Windows 11.
The example is built with existing dependencies, only change to Cargo.toml so far is addition of libc for MacOS's dev-dependencies to allow creation of TUI app with minimal dependencies.
Check the comments along the code for additional information. This example has been reviewed by multiple runs on number of different LLMs such as Claude 4 Opus.
Br.
Matias