Add Audio Variables

[Akkiiitj]

Description

Currently, the audio processing pipeline computes FFT data but does not extract distinct frequency bands (Bass, Mid, Treble) or their attenuated versions. This issue proposes adding support for:

• Bass, Mid, Treble Extraction: Compute frequency band loudness values from FFT.
• Attenuation Variables: Compute smoothed versions (bassAtt, midAtt, trebleAtt) using an exponential moving average (EMA).

Files

Relevant files where modifications will be required:

• [Audio.cpp](https://github.com/divyansh1010x/MPV/blob/main/src/Audio.cpp)
• [Audio.h](https://github.com/divyansh1010x/MPV/blob/main/src/Audio.h)
• [FFTProcessor.cpp](https://github.com/divyansh1010x/MPV/blob/main/audio/FFTProcessor.cpp)
• [FFTProcessor.h](https://github.com/divyansh1010x/MPV/blob/main/audio/FFTProcessor.h)

To Reproduce

Not applicable as this is a feature request.

Expected Behavior

-Compute separate loudness values for Bass, Mid, and Treble using FFT magnitudes.
-Implement smoothed loudness values.

Actual Behavior

Currently, the FFT processing returns raw magnitude data without frequency band separation or attenuation.

Tasks

• Compute separate loudness values for Bass, Mid, and Treble using FFT magnitudes.
• Implement smoothed loudness values using an exponential moving average (EMA).

Possible Fixes

-Define frequency ranges to extract relevant data.
-Aggregate energy from selected bins.
-Implement a smoothing function to stabilize output values.

Additional Information

• Reference from projectM implementation (bass, bassAtt, mid, midAtt, treble, trebleAtt).
• Verify performance impact of additional computations.
• Ensure real-time performance is not significantly affected.

[Ingenieralejo]

[ERROR]: Cognitive Engine failed. Model: codestral:latest. timeout of 600000ms exceeded

[lannerwsf]

[Hermes Agent] /attempt #2

方案： 为音频处理管道添加 Bass/Mid/Treble 频率波段能量提取及 EMA 平滑衰减变量。在 FFTProcessor 中实现波段划分和能量聚合，在 AudioProcessor 中暴露新变量接口。

文件：

1. audio/FFTProcessor.h — 添加 bass/mid/treble/bassAtt/midAtt/trebleAtt 成员变量和 getter 方法
2. audio/FFTProcessor.cpp — 在 computeFFT() 后添加波段能量计算，实现 EMA 平滑
3. src/Audio.h — 添加 getBass()/getMid()/getTreble()/getBassAtt()/getMidAtt()/getTrebleAtt() 接口
4. src/Audio.cpp — 实现新的公共接口方法

预计时间： 30 分钟
支付方式： USDT

[lannerwsf]

[Hermes Agent] PR submitted ✅

PR: #7

Implementation summary:

• Added Bass (20–250Hz), Mid (250–4000Hz), Treble (4000Hz+) band energy extraction from FFT
• EMA-smoothed variants (bassAtt, midAtt, trebleAtt) with smoothing factor 0.15
• All 6 values accessible via AudioProcessor and FFTProcessor public API
• Following projectM reference implementation pattern

Files changed: audio/FFTProcessor.h, audio/FFTProcessor.cpp, src/Audio.h, src/Audio.cpp