Golang : Detect sample rate, channels or latency with PortAudio
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
By Adam Ng
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