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>
76 lines
1.5 KiB
Go
76 lines
1.5 KiB
Go
package audio
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import (
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"bytes"
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"io"
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"sync"
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"sync/atomic"
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"time"
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"github.com/ebitengine/oto/v3"
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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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// PlayMP3Loop 循环播放 MP3(非阻塞)
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// 返回 player 和清理函数,调用者负责 defer cleanup()
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func PlayMP3Loop(r io.ReadCloser) (*oto.Player, func() error, error) {
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// Read the entire MP3 into memory for seeking support
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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 nil, func() error { return nil }, err
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}
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r.Close()
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dec, err := mp3.NewDecoder(bytes.NewReader(data))
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if err != nil {
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return nil, func() error { return nil }, err
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}
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// 获取采样率信息
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sampleRate := int(dec.SampleRate())
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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("BGM Sinc 重采样: %d Hz → %d Hz", sampleRate, UniversalSampleRate)
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reader = newSincResampler(dec, sampleRate, UniversalSampleRate, 2)
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}
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otoCtx, err := initContext()
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if err != nil {
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return nil, func() error { return nil }, err
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}
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player := otoCtx.NewPlayer(reader)
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playing := atomic.Bool{}
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playing.Store(true)
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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defer wg.Done()
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for playing.Load() {
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player.Play()
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for playing.Load() && player.IsPlaying() {
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time.Sleep(10 * time.Millisecond)
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}
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if playing.Load() {
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// 重置解码器位置
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_, _ = dec.Seek(0, io.SeekStart)
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}
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}
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}()
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cleanup := func() error {
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playing.Store(false)
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wg.Wait()
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player.Close()
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return nil
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}
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return player, cleanup, nil
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}
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