Golang implements music playback

In modern society, people pay more and more attention to the quality of life. Music, as an important form of entertainment, has received widespread attention and love. In the process of realizing music playback, there are many methods and tools. Among them, golang, as one of the very popular programming languages ​​​​in recent years, can also be used to implement music playback. This article will introduce in detail how to use golang to implement music playback, including preparation, code implementation and effect display.

1. Preparation

Before you start writing golang code, you need to prepare some software and libraries. Specifically, you need to use the golang language for programming and the SDL library to implement music playback. The following are the specific installation steps:

1. Installing golang

First, you need to install the golang language environment. The corresponding installation package can be downloaded from the official website (https://golang.org/dl/). According to different operating systems, select the corresponding installation package to download, and install it according to the installation wizard. After the installation is complete, enter the following command to check whether the installation is successful:

go version

If the version information appears, it means that golang has been successfully installed.

2. Install SDL library

In golang, you can use the SDL library to implement music playback. To install the SDL library, you need to use the following command:

go get -v github.com/veandco/go-sdl2/{sdl,mix}

This command will install SDL and its related libraries, including SDL mixer, through the go-sdl2 library.

2. Code implementation

Next we will start writing golang code to implement music playback. The specific steps are as follows:

1. Import library

In the starting file for writing code, you need to import the corresponding library. Specifically, the github.com/veandco/go-sdl2/sdl and github.com/veandco/go-sdl2/mix libraries need to be imported.

2. Initialize SDL

Before using the SDL library, it needs to be initialized. Therefore, we need to add the following code to the code:

if err := sdl.Init(sdl.INIT_AUDIO); err != nil {
    panic(err)
}
defer sdl.Quit()

This code will initialize the audio and automatically turn it off when the program ends. After installing the SDL library, you can test whether the example runs correctly:

go run file.go

3. Loading music files

Before playing music, you need to load the music files into the program first . Music files can be loaded by using the LoadWAV() method of the sdl.mixer library. The following is the specific code:

wav, err := mix.LoadWAV("music.wav")
if err != nil {
    panic(err)
}
defer wav.Free()

Here we use a music file named "music.wav". It should be noted that sdl.mixer only supports wav file format.

4. Play music

After loading the music file, we can use the PlayChannel() method of the sdl.mixer library to play music. The following is the specific code:

channel, err := mix.PlayChannel(-1, wav, 0)
if err != nil {
    panic(err)
}
defer channel.Halt()

Among them, we use -1 as the channel number, which means that the available channel is automatically selected. It should be noted here that sdl.mixer can only play up to 32 channels of audio at the same time. Therefore, before playing audio, you need to ensure that all 32 audio channels are unoccupied.

The above code will play the music file "music.wav" in the background of the program. If you want to control the playback and pause of music, you can use channel.Pause(), channel.Resume(), channel.Halt(), etc. method to achieve.

3. Effect display

After completing the above steps, we can start running the code to realize music playback. The following is the specific display effect:

package main

import (
    "fmt"
    "os"
    "github.com/veandco/go-sdl2/mix"
    "github.com/veandco/go-sdl2/sdl"
)

func main() {
    if err := sdl.Init(sdl.INIT_AUDIO); err != nil {
        panic(err)
    }
    defer sdl.Quit()
    if err := mix.OpenAudio(22050, mix.DEFAULT_FORMAT, 2, 4096); err != nil {
        panic(err)
    }
    defer mix.CloseAudio()

    wav, err := mix.LoadWAV("music.wav")
    if err != nil {
        panic(err)
    }
    defer wav.Free()

    channel, err := mix.PlayChannel(-1, wav, 0)
    if err != nil {
        panic(err)
    }
    fmt.Println("Press any key to stop...")
    for {
        if sdl.WaitEvent(nil) == nil {
            break
        }
    }
    channel.Halt()
}

The above code implements the playback of the "music.wav" music file in the background of the program. You can save the code as "go-music.go" and then run it through the following command:

go run go-music.go

Through the above operations, the music playback function can be successfully implemented.

Summary

Using golang to implement music playback is a very interesting job. Although golang is not a language specifically designed for music playback, music playback can be easily achieved by calling the SDL library. Through the introduction of this article, you can learn how to use golang to implement music playback, which provides a reference for the development of your music playback project.

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