Quick Start: Use Go language functions to implement simple audio and video decoding and playback functions

Quick Start: Use Go language functions to implement simple audio and video decoding and playback functions

Introduction:
With the development of the Internet, audio and video media have become an indispensable part of people's daily lives. When developing audio and video related applications, decoding and playback are essential functions. This article will introduce how to use Go language functions to implement simple audio and video decoding and playback functions to help readers get started quickly.

Prerequisites:
Before practicing this tutorial, readers need to have basic knowledge of the Go language and install the Go development environment.

Step 1: Import the necessary packages
In the Go language, we need to use some packages to implement media decoding and playback functions. Specifically, the packages we need to import are:

import (
    "fmt"
    "os"
    "github.com/hajimehoshi/oto"
    "github.com/go-audio/audio"
    "github.com/go-audio/audio/wav"
    "github.com/hajimehoshi/go-mp3"
)

Description:

• fmt: used for formatted output
• os: used to operate files
• github.com/hajimehoshi/oto：used for audio playback
• github.com/go-audio /audio: For audio decoding
• github.com/go-audio/audio/wav: For decoding of WAV audio format
• github.com/hajimehoshi/go-mp3: For decoding MP3 audio format

Step 2: Implement the audio decoding function
In this step, we will write a function, Used to decode audio files. The specific implementation code is as follows:

func decodeAudioFile(filename string) (*audio.IntBuffer, error) {
    file, err := os.Open(filename)
    if err != nil {
        return nil, err
    }
    defer file.Close()

    decoder := wav.NewDecoder(file)

    buf, err := decoder.FullBuffer()
    if err != nil {
        return nil, err
    }

    pcmBuf := &audio.IntBuffer{
        Format: &audio.Format{
            SampleRate:  decoder.SampleRate,
            NumChannels: decoder.NumChans,
        },
        Data: buf.AsIntBuffer(),
    }

    return pcmBuf, nil
}

Description:

• decodeAudioFile: This function is used to decode audio files and return an *audio.IntBuffer type of data.
• os.Open: This function is used to open audio files.
• wav.NewDecoder: This function creates a WAV audio decoder.
• decoder.FullBuffer: This method will decode the entire audio file into an audio buffer and return a *audio.IntBuffer type of data.

Step 3: Implement the audio playback function
In this step, we will write a function to play audio. The specific implementation code is as follows:

func playAudio(pcmBuf *audio.IntBuffer) error {
    p, err := oto.NewPlayer(pcmBuf.Format.SampleRate, pcmBuf.Format.NumChannels, 2, 8192)
    if err != nil {
        return err
    }
    defer p.Close()

    if _, err := p.Write(pcmBuf.Data); err != nil {
        return err
    }

    p.WaitForEOF()

    return nil
}

Description:

• playAudio: This function is used to play audio files.
• oto.NewPlayer: This function creates an audio player.
• p.Write: This method will write audio data to the player for playback.
• p.WaitForEOF: This method will wait for the audio to finish playing.

Step 4: Main function
In the main function, we can connect the above two functions in series to realize the decoding and playback of audio files. The specific implementation code is as follows:

func main() {
    pcmBuf, err := decodeAudioFile("audio.wav")
    if err != nil {
        fmt.Println("Failed to decode audio file:", err)
        return
    }

    err = playAudio(pcmBuf)
    if err != nil {
        fmt.Println("Failed to play audio:", err)
        return
    }
}

Description:

• main: main function, the entry point of the program.
• decodeAudioFile: Call the audio decoding function to decode the audio file.
• playAudio: Call the audio playback function to play the decoded audio.

Conclusion:
This article introduces how to use Go language functions to implement simple audio and video decoding and playback functions. By importing the corresponding package, writing audio decoding and playback functions, and calling these functions in the main function, we can decode and play audio files. Readers can modify and extend it according to their own needs to achieve more complex functions. I hope this article can help readers quickly get started using Go language to process audio and video media.

The above is the detailed content of Quick Start: Use Go language functions to implement simple audio and video decoding and playback functions. For more information, please follow other related articles on the PHP Chinese website!