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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. This is because some systems perform the callback in a special thread, or interrupt handler, and it is rarely ...
File: writing_a_callback.dox | Debian Sources
https://sources.debian.org/src/audacity/2.4.2~dfsg0-5/lib-src/portaudio-v19/doc/src/tutorial/writing_a_callback.dox/
Other platforms require special mutex flags. In addition, it is not safe to call any PortAudio API functions in the callback except as explicitly permitted in the documentation. Your callback function must return an int and accept the exact parameters specified in this typedef: ...
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.
[Portaudio] Lock free queue for callback thread
https://portaudio.music.columbia.narkive.com/R7oogR0M/lock-free-queue-for-callback-thread
[Portaudio] Lock free queue for callback thread ChordWizard Software 2012-04-10 20:59:43 UTC. Permalink. Hi Ross, Thanks for all your advice last week, with that and a lot of study on the weekend, I'm feeling much better oriented with PortAudio now.
PortAudio: PortAudio Tutorials
http://portaudio.com/docs/v19-doxydocs/tutorial_start.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.
Issue with avs-device sdk portaudio callback function ...
https://github.com/alexa/avs-device-sdk/issues/864
Here is the code for portaudio callback function present in avs-device-sdk. int PortAudioMicrophoneWrapper::PortAudioCallback (. const void* inputBuffer, void* outputBuffer, unsigned long numSamples, const PaStreamCallbackTimeInfo* timeInfo, PaStreamCallbackFlags statusFlags, void* userData) {. PortAudioMicrophoneWrapper* wrapper = …
PortAudio - an Open-Source Cross-Platform Audio API
http://www.portaudio.com/faq.html
PortAudio is a cross platform, open-source, audio I/O library. It provides a very simple API for recording and/or playing sound using a simple callback function. PortAudio - an Open-Source Cross-Platform Audio API
portaudio/pa_jack.c at master · PortAudio/portaudio · GitHub
https://github.com/PortAudio/portaudio/blob/master/src/hostapi/jack/pa_jack.c
ASSERT_CALL ( pthread_mutex_lock ( &stream-> hostApi-> mtx), 0); if ( abort) stream-> doAbort = 1; else: stream-> doStop = 1; /* Wait for stream to be stopped */ result = WaitCondition ( stream-> hostApi); ASSERT_CALL ( pthread_mutex_unlock ( &stream-> hostApi-> mtx), 0); ENSURE_PA ( result ); UNLESS ( !stream-> is_active, paInternalError );
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