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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.
PortAudio – an Open Source Cross Platform Audio API
https://www.ee.columbia.edu/~mim/meap/paMat/portaudio_v18_1/docs/portaudio_icmc2001.pdf
latency, callbacks versus blocking read/write calls, and effi-ciency. 1. Introduction ... using PortAudio to obtain audio I/O on multiple platforms. 3.1. Initialisation and Device Enumeration Before making use of the PortAudio library ... plied by the user's PortAudio callback function.
an Open-Source Cross-Platform Audio API - PortAudio
Many applications use PortAudio for Audio I/O. 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.
Portaudio: Bindings for the Portaudio portable sound library
https://docs.racket-lang.org/portaudio/index.html
The first and largest issue is the block of memory shared between the Racket engine and the C callback. The current setup is that the memory is freed by a close-stream callback associated with the stream on the Portaudio side. The sequence is therefore this: Racket calls CloseStream. Portaudio then stops calling the callback, and closes the stream.
PortAudio: Starting, Stopping and Aborting a Stream
http://www.portaudio.com/docs/v19-doxydocs/start_stop_abort.html
PortAudio: Starting, Stopping and Aborting a Stream Starting, Stopping and Aborting a Stream PortAudio will not start playing back audio until you start the stream. After calling Pa_StartStream (), PortAudio will start calling your callback function to perform the audio processing. err = Pa_StartStream ( stream );
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