Golang : Detect sample rate, channels or latency with PortAudio



Tags : golang portaudio sample-rate headphone latency microphone

Problem:

You want to detect the sample rate, channels or latency of the input and output devices attached to your computer. Such as microphone and headphone. How to do that?

Solution:

We will use the Golang-PortAudio to extract the devices information that we want.

For example, if you are looking for the microphone's sample rate. The default input device detected can be Microsoft® LifeCam Cinema(TM with the sample rate of 44100

NOTES:

Using the wrong input sample rate will cause Input Overflowed error.

Here you go!


 package main

 import (
 "fmt"
 "github.com/gordonklaus/portaudio"
 )

 func main() {

 // init PortAudio

 portaudio.Initialize()

 detectedDevices, err := portaudio.Devices()

 if err != nil {
 panic(err)
 }

 fmt.Println("Detected audio input and output devices : ")
 for key, value := range detectedDevices {
 fmt.Printf("Key : %v , Value : %v\n", key, value)
 }

 fmt.Println("Default audio INPUT device : ")
 defaultInput, err := portaudio.DefaultInputDevice()

 if err != nil {
 panic(err)
 }

 // see https://godoc.org/github.com/gordonklaus/portaudio#DeviceInfo
 // for more details on Channels and Latency

 fmt.Printf("%v has sample rate of %v\n", defaultInput.Name, defaultInput.DefaultSampleRate)

 fmt.Println("Default audio OUTPUT device : ")
 defaultOutput, err := portaudio.DefaultOutputDevice()

 if err != nil {
 panic(err)
 }

 fmt.Printf("%v has sample rate of %v\n", defaultOutput.Name, defaultOutput.DefaultSampleRate)

 portaudio.Terminate()

 }

Sample output:

Detected audio input and output devices :

Key : 0 , Value : &{0 Microsoft® LifeCam Cinema(TM 1 0 3.71882ms 10ms 13.877551ms 100ms 44100 0xc420072140}

Key : 1 , Value : &{1 Line-out (Green Rear) 0 2 10ms 2.333333ms 100ms 11.666666ms 48000 0xc420072140}

Key : 2 , Value : &{2 Headphones (Green Front) 0 2 10ms 583.333µs 100ms 2.916666ms 192000 0xc420072140}

Key : 3 , Value : &{3 Microphone (Pink Rear) 2 0 2.333333ms 10ms 11.666666ms 100ms 48000 0xc420072140}

Key : 4 , Value : &{4 Microphone (Pink Front) 2 0 583.333µs 10ms 2.916666ms 100ms 192000 0xc420072140}

Default audio INPUT device :

Microsoft® LifeCam Cinema(TM has sample rate of 44100

Default audio OUTPUT device :

Headphones (Green Front) has sample rate of 192000

References:

https://godoc.org/github.com/gordonklaus/portaudio#DeviceInfo

https://socketloop.com/tutorials/golang-record-voice-audio-from-microphone-to-wav-file

  See also : Golang : Record voice(audio) from microphone to .WAV file



Tags : golang portaudio sample-rate headphone latency microphone

By Adam Ng

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