sample-rate-experiments.go

/* first, "go get" these dependencies:
      github.com/faiface/beep
      github.com/hajimehoshi/oto
*/

package main

import (
	"fmt"
	"github.com/faiface/beep"
	"github.com/faiface/beep/mp3"
	"github.com/faiface/beep/speaker"
	"log"
	"os"
	"time"
)

func main() {
	f, err := os.Open("./assets/day-tripper.mp3")
	if err != nil {
		log.Fatal(err)
	}
	streamer, format, err := mp3.Decode(f)
	if err != nil {
		log.Fatal(err)
	}
	defer streamer.Close()

	steps := -7
	sr := beep.SampleRate(float64(format.SampleRate) * (float64(steps)/12 + 1))
	fmt.Println("original sample rate", format.SampleRate)
	fmt.Println("     new sample rate", sr)

	speaker.Init(sr, sr.N(time.Second/10))
	speaker.Play(streamer)
	select {}
}