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Confused about Passing user data to PortAudio Callbacks
https://stackoverflow.com/questions/60458785/confused-about-passing-user-data-to-portaudio-callbacks
The problem you're having with your callback data is that it goes out of scope and memory is deallocated as soon as init_stuff finishes execution. You should allocate memory for your callback data using malloc or new and passing the pointer to it for the callback. For example:
PortAudio: Writing a Callback Function
http://www.portaudio.com/docs/v19-doxydocs/writing_a_callback.html
The "callback" is a function that is called by the PortAudio engine whenever it has captured audio data, or when it needs more audio data for output. Before we begin, it's important to realize that the callback is a delicate place.
c++ - Portaudio Callback Function Example - Stack Overflow
https://stackoverflow.com/questions/26172522/portaudio-callback-function-example
Many apps may want to use paFramesPerBufferUnspecified, which tells PortAudio to pick the best, possibly changing, buffer size.*/ patestCallback, /* this is your callback function */ &paData ); /*This is a pointer that will be passed to your callback*/. An example of a good callback function would be very useful, but of course any help is ...
PortAudio - an Open-Source Cross-Platform Audio API
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.
malloc(): memory corruption (fast) after - C++ Forum
https://www.cplusplus.com/forum/unices/120414/
This means that, during a call to malloc, it was detected that memory was corrupt. It does not mean the call to malloc corrupted the memory. It does mean that memory was already corrupt, and that you should look to previous manipulations of memory (in possibly other areas of the code) to find the place it happens. Dec 22, 2013 at 12:25pm
Is it possible to write a Portaudio callback in Rust? : rust
https://www.reddit.com/r/rust/comments/1sbszh/is_it_possible_to_write_a_portaudio_callback_in/
This is the prototype for Portaudio's callback, btw: typedef int PaStreamCallback( const void *input, void *output, unsigned long frameCount, const PaStreamCallbackTimeInfo* timeInfo, PaStreamCallbackFlags statusFlags, void *userData ) ; ... Result vs exceptions, borrow checking vs malloc/free, Rust's smart pointers vs C++'s smart pointers ...
Portaudio: Bindings for the Portaudio portable sound library
https://docs.racket-lang.org/portaudio/index.html
Portaudio then stops calling the callback, and closes the stream. Then, it calls the provided "all-done" callback, which frees the memory. One note here is that Racket should probably wrap the pointer in a mutable object so that it can be severed on the Racket side when the stream is …
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