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PortAudio: PaHostApiInfo Struct Reference
http://www.portaudio.com/docs/v19-doxydocs/structPaHostApiInfo.html#:~:text=The%20default%20output%20device%20for%20this%20host%20API.,available.%20Definition%20at%20line%20322%20of%20file%20portaudio.h.
PortAudio: Opening a Stream Using Defaults
http://www.portaudio.com/docs/v19-doxydocs/open_default_stream.html
PortAudio. The next step is to open a stream, which is similar to opening a file. You can specify whether you want audio input and/or output, how many channels, the data format, sample rate, etc. Opening a ''default'' stream means opening the default input and output devices, which saves you the trouble of getting a list of devices and choosing one from the list.
c - Port Audio:How to solve the error of finding default ...
https://stackoverflow.com/questions/35967529/port-audiohow-to-solve-the-error-of-finding-default-devices-in-portaudiowindow
You can do this by printing the result of a call to Pa_GetDeviceCount(), or you can compile and run examples/pa_devs.c. pa_devswill give you the list of devices that PortAudio has detected. If the list is non-empty you can try to manually substitute the device index into outputParameters.device. However, if there is no default device available then I suspect that …
PortAudio: PaHostApiInfo Struct Reference
http://files.portaudio.com/docs/v19-doxydocs/structPaHostApiInfo.html
PaDeviceIndex PaHostApiInfo::defaultOutputDevice. The default output device for this host API. The value will be a device index ranging from 0 to ( Pa_GetDeviceCount () -1), or paNoDevice if no default output device is available. Definition at line 323 of file portaudio.h. int PaHostApiInfo::deviceCount.
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