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ubuntu - Portaudio select input device for capturing ...

https://stackoverflow.com/questions/50248813/portaudio-select-input-device-for-capturing

I face some problems with set up input device for portaudio. I have 2 cards 0 and 1, and I want to configure: card 0 for capturing, card 1 for playing. So, I edit asound.conf like this: pcm!.default { type asym playback.pcm "plughw:1" capture.pcm "plughw:0" } I realize portaudio can not record audio file, it's always 0 byte in record file.

PortAudio: Enumerating and Querying PortAudio Devices

http://www.portaudio.com/docs/v19-doxydocs/querying_devices.html

deviceInfo = Pa_GetDeviceInfo ( i ); ... } The Pa_DeviceInfo structure contains a wealth of information such as the name of the devices, the default latency associated with the devices and more. The structure has the following fields: int structVersion. const char * name. PaHostApiIndex hostApi. int maxInputChannels.

PortAudio - an Open-Source Cross-Platform Audio API

http://portaudio.com/

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: portaudio.h File Reference

http://files.portaudio.com/docs/v19-doxydocs/portaudio_8h.html

On the PC, the user can specify a default device by setting an environment variable. For example, to use device #1. set PA_RECOMMENDED_OUTPUT_DEVICE=1 The user should first determine the available device ids by using the supplied application "pa_devs".

Psychtoolbox-3 - PsychPortAudio(‘Open’)

http://psychtoolbox.org/docs/PsychPortAudio-Open

pahandle = PsychPortAudio(‘Open’ [, deviceid][, mode][, reqlatencyclass][, freq][, channels][, buffersize][, suggestedLatency][, selectchannels][, specialFlags=0]); Open a PortAudioaudio device and initialize it. Returns a ‘pahandle’ device. handle for the device.

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