mapleafgo
ec168be827
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统一音频输出采样率为 44100Hz，使用 go-audio-resampler 库实现 Windowed Sinc + Polyphase FIR 算法（VeryHigh 28-bit 精度）， 替代原有的线性插值透传方案。 主要变更： - 新增 sincResampler：三阶段 Read 循环（填充→处理→Flush） - 双缓冲区架构避免输出样本丢失，复用内存减少 GC 压力 - WAV/MP3/BGM 播放管线全部接入 Sinc 重采样器 - 移除旧的 linearResampler 和透传模式 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
133 lines
3.0 KiB
Go
133 lines
3.0 KiB
Go
package audio
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"time"
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"github.com/youpy/go-wav"
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"github.com/hajimehoshi/go-mp3"
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"go.uber.org/zap"
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)
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// PlayWav 播放 WAV 文件(阻塞),直到完成或 context 取消
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func PlayWav(ctx context.Context, r io.ReadCloser) error {
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// Read the entire file into memory since wav.NewReader needs ReadAt
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data, err := io.ReadAll(r)
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if err != nil {
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r.Close()
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return fmt.Errorf("读取 WAV 文件失败: %w", err)
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}
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r.Close()
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// Create a reader from the buffered data
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dec := wav.NewReader(bytes.NewReader(data))
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// 获取音频格式信息
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format, err := dec.Format()
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if err != nil {
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return fmt.Errorf("获取 WAV 格式失败: %w", err)
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}
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duration, _ := dec.Duration()
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sourceRate := int(format.SampleRate)
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zap.S().Infof("WAV 音频: %d ch, %d Hz, 时长: %v",
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format.NumChannels, sourceRate, duration)
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// 需要重采样（使用 Sinc 高质量重采样）
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var reader io.Reader = dec
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if needsResampling(sourceRate) {
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zap.S().Infof("Sinc 重采样: %d Hz → %d Hz", sourceRate, UniversalSampleRate)
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reader = newSincResampler(dec, sourceRate, UniversalSampleRate, int(format.NumChannels))
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}
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otoCtx, err := initContext()
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if err != nil {
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return fmt.Errorf("音频上下文初始化失败: %w", err)
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}
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player := otoCtx.NewPlayer(reader)
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defer player.Close()
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player.Play()
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// 等待播放完成
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done := make(chan struct{})
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go func() {
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for !player.IsPlaying() {
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time.Sleep(10 * time.Millisecond)
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}
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for player.IsPlaying() {
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time.Sleep(10 * time.Millisecond)
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}
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time.Sleep(200 * time.Millisecond)
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close(done)
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}()
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select {
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case <-done:
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return nil
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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// PlayMP3 播放 MP3 文件(阻塞),直到完成或 context 取消
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func PlayMP3(ctx context.Context, r io.ReadCloser) error {
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dec, err := mp3.NewDecoder(r)
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if err != nil {
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r.Close()
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return fmt.Errorf("MP3 解码失败: %w", err)
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}
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defer r.Close()
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// MP3 解码器信息
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sampleRate := int(dec.SampleRate())
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sampleCount := dec.Length()
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channels := 2 // MP3 通常是立体声
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duration := time.Duration(float64(sampleCount)/float64(sampleRate)*1000) * time.Millisecond
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zap.S().Infof("MP3 音频: %d Hz → %d Hz, 时长约: %v",
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sampleRate, UniversalSampleRate, duration)
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// 需要重采样（使用 Sinc 高质量重采样）
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var reader io.Reader = dec
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if needsResampling(sampleRate) {
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zap.S().Infof("Sinc 重采样: %d Hz → %d Hz", sampleRate, UniversalSampleRate)
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reader = newSincResampler(dec, sampleRate, UniversalSampleRate, channels)
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}
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otoCtx, err := initContext()
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if err != nil {
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return fmt.Errorf("音频上下文初始化失败: %w", err)
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}
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player := otoCtx.NewPlayer(reader)
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defer player.Close()
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player.Play()
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// 等待播放完成
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done := make(chan struct{})
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go func() {
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for !player.IsPlaying() {
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time.Sleep(10 * time.Millisecond)
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}
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for player.IsPlaying() {
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time.Sleep(10 * time.Millisecond)
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}
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time.Sleep(200 * time.Millisecond)
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close(done)
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}()
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select {
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case <-done:
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return nil
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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