[Fix]Improve AudioFilter pipeline

[ipavlidakis]

🎯 Goal

Rewire AudioProcessing pipeline to provide information around the captured AudioBuffers.

🛠 Implementation

This revision transitions the existing AudioProcessing pipeline a Store structure that allows better control and reporting over AudioFiltering. This revision sets the foundation for the HiFI implementation and the WebRTC migration.

🧪 Manual Testing Notes

• Join a call with someone
• Ensure the NoiseCancellation filter works
• Ensure the Robot filter works

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• This change follows zero ⚠️ policy (required)
• This change should receive manual QA
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Comparison screenshots added for visual changes
• Affected documentation updated (tutorial, CMS)

[github-actions]

	1 Warning
⚠️	Big PR

Generated by 🚫 Danger

[github-actions]

Public Interface

- open class StreamAudioFilterProcessingModule: RTCDefaultAudioProcessingModule, AudioProcessingModule, @unchecked Sendable  
- 
-   public var activeAudioFilter: AudioFilter?
-   
- 
-   public init(config: RTCAudioProcessingConfig? = nil,capturePostProcessingDelegate: AudioFilterCapturePostProcessingModule = StreamAudioFilterCapturePostProcessingModule(),renderPreProcessingDelegate: RTCAudioCustomProcessingDelegate? = nil)
-   
- 
-   override public func apply(_ config: RTCAudioProcessingConfig)
-   public func setAudioFilter(_ filter: AudioFilter?)

- open class StreamAudioFilterCapturePostProcessingModule: NSObject, AudioFilterCapturePostProcessingModule, @unchecked Sendable  
- 
-   public private var audioFilter: AudioFilter?
-   public private var sampleRate: Int
-   public private var channels: Int
-   
- 
-   override public init()
-   
- 
-   open func setAudioFilter(_ audioFilter: AudioFilter?)
-   open func audioProcessingInitialize(sampleRate sampleRateHz: Int,channels: Int)
-   open func audioProcessingProcess(audioBuffer: RTCAudioBuffer)
-   open func audioProcessingRelease()

- public protocol AudioFilterCapturePostProcessingModule: RTCAudioCustomProcessingDelegate

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
StreamVideo	8.63 MB	8.65 MB	+20 KB	🟢
StreamVideoSwiftUI	2.36 MB	2.36 MB	0 KB	🟢
StreamVideoUIKit	2.48 MB	2.48 MB	0 KB	🟢
StreamWebRTC	9.85 MB	9.85 MB	0 KB	🟢

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
85.5% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud