wangyu a82c24ec85 fix: resolve waveform race on track switch ...

1. Root cause: onBufferDetector() set m_stopFlag on a running thread
   but never called wait(); start() on a running QThread is a no-op so
   the new track's waveform detection never launched; the old thread's
   exit path also cleared m_curPath/m_curHash, overwriting the new
   track metadata just set by onBufferDetector()
2. Fix: introduce QMutex-protected request generation counter and
   pending-request queue; new requests arriving while the worker is
   running are queued and started via QThread::finished signal; stale
   thread results are discarded by generation check in resample and
   forwardAudioBuffer; QML side also filters stale buffers by hash
3. Impact: public audioBuffer signal and slot signatures unchanged;
   AudioAnalysis and all existing callers unaffected; new concurrency
   test covers the race scenario

Log: fix waveform progress bar anomaly on track switch

Influence:
1. Test waveform display when rapidly switching tracks
2. Test waveform display when playing from album page
3. Verify no stale waveform data after track switch

fix: 修复切歌时波形进度条状态异常

1. 根因：onBufferDetector() 在检测线程运行时仅设置 m_stopFlag 但未
   调用 wait() 等待线程退出，对运行中的线程调用 start() 是空操作导致
   新歌曲波形检测无法启动；旧线程退出时 clear m_curPath/m_curHash
   覆盖刚设置的新歌曲信息
2. 方案：引入 QMutex 保护的请求代际计数器和待处理请求队列；新请求在
   工作线程运行时排队，通过 QThread::finished 信号启动；resample 和
   forwardAudioBuffer 中通过代际检查丢弃过期结果；QML 侧通过 hash
   比较过滤过期波形数据
3. 影响：公开 audioBuffer 信号和槽签名未变，AudioAnalysis 及所有现有
   调用方不受影响；新增竞态测试覆盖切歌场景

Log: 修复切歌时波形进度条状态异常

Influence:
1. 测试快速切歌时的波形显示
2. 测试从专辑页面播放时的波形显示
3. 验证切歌后无过期波形数据残留

PMS: BUG-378709

2026-09-30 01:20:26 +00:00

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libdmusic

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music-player

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CMakeLists.txt

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