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@lm060719 lm060719 released this 19 Aug 11:27
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GlassMic v1.3.4.7

🚀 本次更新带来了全新重构的高保真音频重采样引擎、实时耳返监听功能、在线游戏（如 Roblox）硬实时低延迟优化，以及更直观的全链路推流状态可视化与 TTS 本地试听体验。

🚀 This release introduces a newly refactored Hi-Fi audio resampling engine, real-time audio monitoring, hard real-time low-latency optimizations for online games, full-pipeline streaming status awareness, and local TTS preview capabilities.

🇨🇳 中文更新日志 (Changelog)

🎵 音频核心引擎与高保真重采样 (Hi-Fi Resampling)

  • Windowed-Sinc FIR 抗混叠低通滤波：引入基于 Blackman-Harris 窗的 27 阶低通滤波器，自动在下采样（$48\text{k}\to 16\text{k}$ / $44.1\text{k}\to 16\text{k}$）时滤除奈奎斯特极限以上的镜像混叠能量，彻底解决微信语音等场景的破音、金属毛刺和高频嘶嘶杂音[cite: 1]。
  • 亚采样点级线性插值与连续流处理：消除阶梯时域伪影，跨分块严格保持滤波器延迟线与时钟游标连续，实现零爆音平滑过渡[cite: 1]。
  • 防削波软拐点限幅器 (Soft Knee Limiter)：引入双曲正切软过渡限幅算法，防止动态峰值过冲导致的方波削波失真[cite: 1]。
  • 底层解码与 Native 优化：重构 FileAudioSource 解码链路统一接入高质量重采样混音[cite: 1]；优化 glass_aaudio.cpp 原生拦截路径音质[cite: 1]。

🎧 实时耳返监听 (Audio Monitor)

  • 低延迟本地监听 (AudioMonitorPlayer)：基于高响应 AudioTrack 实现耳机/扬声器实时监听，与虚拟麦克风广播严格同步，所听即所录[cite: 1]。
  • 独立音量控制与持久化：Proto 配置与设置页支持 0%~100% 独立音量调节并持久化保存[cite: 1]。
  • 悬浮窗快捷开关：在 MiniBar 与 TTS 面板集成 🎧 耳返快捷开关，支持一键启闭[cite: 1]。

⚡ 在线/直播游戏硬实时低延迟优化

  • SPSC 无锁环形缓冲区 (SpscRingBuffer)：Native 端实现 256 KB SPSC 无锁环形缓冲区与独立读取线程，硬实时音频回调与 IPC 管道 I/O 完全解耦，彻底消除 Buffer Underrun / XRun 卡顿[cite: 1]。
  • 欠载平滑补偿 (PLC)：优化欠载时的舒适噪声填充与真实采样率映射，杜绝音频时间拉伸变调与漏音[cite: 1]。
  • 线程调度与保活：音频推流线程优先级提升至 URGENT_AUDIO，切片精细化至 20ms（1920 字节），前台服务增加 Partial WakeLock 防止系统休眠断流[cite: 1]。

👁️ 全链路推流状态感知与动效可视化

  • 实时推流感知 (isStreaming)：动态监测目标应用是否正在实际录音取流[cite: 1]。
  • 悬浮球 (Floating Bubble) 动效：新增推流脉冲呼吸动效与高亮绿点，统一支持 FILE / TTS 环形进度展示[cite: 1]。
  • 悬浮窗 MiniBar & 主页：增加「● 录制推流中 / ○ 待命中」实时状态指示与精准时间戳进度同步[cite: 1]。

🗣️ TTS 本地试听与交互升级

  • 独立本地试听 (togglePreviewTts)：支持直接通过扬声器/耳机试听合成语音，不占用虚拟麦克风推流管线[cite: 1]。
  • TTS 面板重构：集成「🔊 试听 / ⏹ 停止」按钮、耳返快捷开关与实时进度调节条[cite: 1]。
  • 国际化适配：补齐中英文多语言文案与提示支持[cite: 1]。

🌐 English Changelog

🎵 Audio Engine & Hi-Fi Resampling

  • Windowed-Sinc FIR Anti-Aliasing Filter: Implemented a 27th-order Blackman-Harris windowed low-pass filter that eliminates mirror aliasing above the Nyquist limit during downsampling ($48\text{k}\to 16\text{k}$ / $44.1\text{k}\to 16\text{k}$), completely fixing harsh sibilance, metallic artifacts, and hissing in WeChat voice messages[cite: 1].
  • Sub-sample Linear Interpolation: Replaced nearest-neighbor truncation with fractional-sample interpolation and persistent filter delay lines across chunks to ensure zero-pop, seamless transitions[cite: 1].
  • Soft Knee Limiter: Added a tanh-based soft limiter after interpolation to prevent clipping distortion caused by peak overshoot[cite: 1].
  • Native & Pipeline Refactoring: Overhauled FileAudioSource with streaming resampling[cite: 1]; optimized glass_aaudio.cpp native audio conversion pipeline[cite: 1].

🎧 Real-time Audio Monitoring

  • Low-Latency Monitor Engine (AudioMonitorPlayer): Real-time audio playback through headphones/speakers synchronized with the virtual mic broadcast loop[cite: 1].
  • Volume Control & Persistence: Added a 0%–100% volume slider and toggle with Proto configuration persistence[cite: 1].
  • Floating Window Shortcuts: Added a 🎧 quick toggle in both MiniBar and TTS panels[cite: 1].

⚡ Real-Time Latency Optimizations for Online Games

  • SPSC Lock-Free Ring Buffer (SpscRingBuffer): 256 KB native SPSC ring buffer decoupled from IPC pipe I/O via a dedicated worker thread, completely eliminating audio underrun / XRun stutters[cite: 1].
  • Packet Loss Concealment (PLC): Refined comfort noise generation and sample rate mapping during underruns to prevent audio pitch shifts and missing samples[cite: 1].
  • Thread Scheduling & WakeLock: Elevated audio publisher thread priority to URGENT_AUDIO, refined slicing down to 20ms (1920 bytes), and added Partial WakeLock to prevent background sleep interruptions[cite: 1].

👁️ Streaming Awareness & Visual Indicators

  • Real-time Streaming Detection (isStreaming): Dynamically monitors target application consumption and recording states[cite: 1].
  • Floating Bubble Upgrades: Added pulse breathing animations, glowing green status dots, and unified circular progress rings for both FILE and TTS modes[cite: 1].
  • MiniBar & HomeScreen: Real-time indicators ("● Streaming / ○ Idle") and timestamp progress bars[cite: 1].

🗣️ TTS Local Preview & UI Refinements

  • Local Preview (togglePreviewTts): Listen to synthesized speech locally without occupying or interfering with the active virtual mic stream[cite: 1].
  • Redesigned TTS Panel: Integrated "🔊 Preview / ⏹ Stop" controls, monitor switch, and progress slider[cite: 1].
  • Localization: Full internationalization support for Simplified Chinese and English[cite: 1].

📦 Git Commits & Changes Summary

  • 743503d Follow up version bump (v1.3.4.7)[cite: 1]
  • ae39218 fix(audio): Refactor audio resampling engine, fix 16kHz aliasing & distortion issues[cite: 1]
  • 6f411ff feat: Support real-time audio monitor, streaming awareness, and local TTS preview[cite: 1]
  • 6205b15 Code style & cleanups[cite: 1]
  • b97e804 Optimize virtual mic stuttering and dropouts in online/live games[cite: 1]

📊 Stats: 22 files changed, +1384 insertions, -346 deletions[cite: 1].

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