Go语言音频处理库探索：从波形数据提取到生态系统概览

package main

import (
    "fmt"
    "math"
    // 假设有一个名为 "audio/decoder" 的库
    // "github.com/someuser/audio/decoder"
)

// DecodeAudioFile 模拟解码音频文件并返回PCM样本
// 在实际应用中，这里会调用具体的音频解码库
func DecodeAudioFile(filePath string) ([]float64, int, error) {
    // 实际解码逻辑会在这里
    // 假设我们得到了一些模拟的PCM样本
    samples := []float64{
        0.1, 0.2, 0.3, 0.2, 0.1, -0.1, -0.2, -0.3, -0.2, -0.1,
        0.4, 0.5, 0.6, 0.5, 0.4, -0.4, -0.5, -0.6, -0.5, -0.4,
        0.7, 0.8, 0.9, 0.8, 0.7, -0.7, -0.8, -0.9, -0.8, -0.7,
    }
    sampleRate := 44100 // 假设采样率为44.1kHz
    return samples, sampleRate, nil
}

// ExtractWaveformPeaks 从PCM样本中提取波形峰值
// windowSizeMs: 每个窗口的毫秒数
// sampleRate: 音频的采样率
func ExtractWaveformPeaks(samples []float64, sampleRate int, windowSizeMs int) []float64 {
    if len(samples) == 0 || windowSizeMs <= 0 || sampleRate <= 0 {
        return nil
    }

    samplesPerWindow := int(float64(sampleRate) * float64(windowSizeMs) / 1000.0)
    if samplesPerWindow == 0 {
        samplesPerWindow = 1 // 确保每个窗口至少有一个样本
    }

    var peaks []float64
    for i := 0; i < len(samples); i += samplesPerWindow {
        end := i + samplesPerWindow
        if end > len(samples) {
            end = len(samples)
        }

        windowSamples := samples[i:end]
        maxPeak := 0.0
        for _, s := range windowSamples {
            absS := math.Abs(s)
            if absS > maxPeak {
                maxPeak = absS
            }
        }
        peaks = append(peaks, maxPeak)
    }
    return peaks
}

func main() {
    filePath := "audio.wav" // 假设的音频文件路径
    samples, sampleRate, err := DecodeAudioFile(filePath)
    if err != nil {
        fmt.Printf("Error decoding audio file: %v\n", err)
        return
    }

    windowSizeMs := 50 // 50毫秒一个窗口
    peaks := ExtractWaveformPeaks(samples, sampleRate, windowSizeMs)

    fmt.Printf("Extracted %d waveform peaks:\n", len(peaks))
    // 打印部分峰值数据，实际应用中会用于绘制
    for i, peak := range peaks {
        if i >= 10 { // 只打印前10个
            break
        }
        fmt.Printf("Window %d: %.4f\n", i+1, peak)
    }
    // 可以将peaks数据用于图形库绘制波形
}