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Project 25Advent Calendar 2019

Day 8

Goで音楽を奏でてみた

Posted at

Advent Calendar5日目に音声分析をGoでやろうとして挫折してしまいましたが、せめて音楽を再生できないか調べてみました。
https://qiita.com/usk81/items/8284ff74e79bdbd7dbae

pydub相当のパッケージは存在しませんが、音楽ファイルを再生できるぐらいのものはありました。

beep
https://github.com/faiface/beep

// package main plays two audio file
package main

import (
	"log"
	"os"
	"time"

	"github.com/faiface/beep"
	"github.com/faiface/beep/mp3"
	"github.com/faiface/beep/speaker"
)

func main() {
	f, err := os.Open("test.mp3")
	if err != nil {
		log.Fatal(err)
	}
	st, format, err := mp3.Decode(f)
	if err != nil {
		log.Fatal(err)
	}
	defer st.Close()

	speaker.Init(format.SampleRate, format.SampleRate.N(time.Second/10))

	done := make(chan bool)
	speaker.Play(beep.Seq(st, beep.Callback(func() {
		done <- true
	})))
	<-done
}

ちなみに音楽再生は oto というライブラリに依存しているものがほとんどでした。

oto
https://github.com/hajimehoshi/oto

hajimehoshi?
なんか聞いたことがある... (´ε`;)

golang.tokyoで何度か登壇されてたebiten作った人でした
https://github.com/hajimehoshi/ebiten

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