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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: 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.
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.
GitHub - PortAudio/portaudio: PortAudio is a cross ...
https://github.com/PortAudio/portaudio
PortAudio is a portable audio I/O library designed for cross-platform support of audio. It uses either a callback mechanism to request audio processing, or blocking read/write calls to buffer data between the native audio subsystem and the client.
PortAudio: Blocking Read/Write Functions
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.
PortAudio: PortAudio API Overview
http://files.portaudio.com/docs/v19-doxydocs/api_overview.html
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 Tutorial - Columbia University
https://www.ee.columbia.edu/~mim/meap/paMat/portaudio_v18_1/docs/pa_tut_over.html
Write a callback function that will be called by PortAudio when audio processing is needed. Initialize the PA library and open a stream for audio I/O. Start the stream. Your callback function will be now be called repeatedly by PA in the background. In your callback you can read audio data from the inputBuffer and/or write data to the outputBuffer.
PortAudio: portaudio.h File Reference
http://portaudio.com/docs/v19-doxydocs/portaudio_8h.html
When a stream is running, PortAudio calls the stream callback periodically. The callback function is responsible for processing buffers of audio samples passed via the input and output parameters. The PortAudio stream callback runs at very high or real-time priority. It is required to consistently meet its time deadlines.
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