refactor: improve audio device initialization process

[tphakala]

Allow starting application without any working capture device

[coderabbitai]

Walkthrough

The changes improve audio analysis and capture functionality. In internal/analysis/realtime.go, error handling for buffer initialization is refined to log warnings and accumulate errors, and a new control flow using a monitorDone channel in startControlMonitor ensures proper shutdown. In internal/myaudio/capture.go, audio device selection is enhanced by refactoring selectCaptureSource to require only settings, and the CaptureAudio function now passes a validated capture source to captureAudioMalgo. These updates aim to increase the robustness and clarity of real-time audio processing.

Changes

Files	Summary of Changes
internal/analysis/realtime.go	Updated RealtimeAnalysis to append the "malgo" source only after successful device initialization; modified error handling in buffer initialization to log warnings and accumulate errors; added a monitorDone channel in startControlMonitor for improved control flow management.
internal/myaudio/capture.go	Revised selectCaptureSource to use only settings; refactored CaptureAudio to forward the initialized capture source to captureAudioMalgo; enhanced device initialization and error logging for audio capture.

Sequence Diagram(s)

sequenceDiagram
    participant Main as Application
    participant Analysis as RealtimeAnalysis
    participant Buffer as BufferManager
    participant Monitor as ControlMonitor

    Main->>Analysis: Initialize real-time analysis
    Analysis->>Buffer: Call initializeBuffers(sources)
    Buffer-->>Analysis: Return aggregated errors (if any)
    Analysis->>Monitor: Start control monitor (with monitorDone channel)
    Monitor-->>Analysis: Signal monitor completion

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sequenceDiagram
    participant App as Application
    participant Capture as CaptureAudio
    participant Selector as selectCaptureSource
    participant Device as malgo Device

    App->>Capture: Invoke CaptureAudio with settings
    Capture->>Selector: Request capture source
    Selector->>Device: Initialize and test audio device
    alt Device initialization succeeds
        Device-->>Selector: Return captureSource
        Selector-->>Capture: Return captureSource
        Capture->>Device: Call captureAudioMalgo(captureSource)
        Device-->>Capture: Audio capture started
    else Device initialization fails
        Device-->>Selector: Log error and fallback
        Selector-->>Capture: Return error, try alternate source
    end

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Possibly related PRs

• refactor: refactor analysis and capture buffers to support multiple i… #188: Involves similar modifications in RealtimeAnalysis targeting audio buffer initialization and management.

Poem

I'm a little rabbit with a code delight,
Hopping through streams from morning to night.
Buffers now sing a resilient tune,
Channels dance under a debugging moon.
Bugs hop away as new flows unite—
Cheers to smooth code and audio insight!
🐰 Happy coding!

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ef2ae02 and 994cd0f.

📒 Files selected for processing (2)

• internal/analysis/realtime.go (3 hunks)
• internal/myaudio/capture.go (10 hunks)

🧰 Additional context used

🪛 GitHub Actions: Build docker image

internal/myaudio/capture.go

[error] 263-263: Cognitive complexity 52 of func CaptureAudio is high (> 50) (gocognit)

🪛 GitHub Actions: golangci-lint

internal/myaudio/capture.go

[warning] 263-263: Cognitive complexity 52 of func CaptureAudio is high (> 50).

🪛 GitHub Actions: golangci-test

internal/myaudio/capture.go

[warning] 263-263: Cognitive complexity 52 of func CaptureAudio is high (> 50).

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: Analyze (go)

🔇 Additional comments (25)

internal/myaudio/capture.go (16)

272-272: Variable declaration looks straightforward.

---

313-319: Robust device selection fallback.
Logging a warning and returning early when device selection fails is a practical approach, preventing the application from crashing in absence of a functioning capture device.

---

361-363: Clear documentation and signature.
The docstring and function signature are well-defined, making the purpose and usage of selectCaptureSource easy to follow.

---

364-384: Clean multi-platform malgo context initialization.
Selecting backends by OS ensures correct handling across Linux, Windows, and macOS.

---

390-393: Good error propagation.
Returning errors on failure to retrieve devices keeps error handling clear at the call site.

---

422-455: Verifying device readiness proactively.
Initializing and starting the device as a test is an excellent approach to ensure only functional devices are returned.

---

483-483: Refactored function signature.
Accepting a captureSource explicitly is cleaner and more flexible.

---

510-510: Proper resource cleanup.
Defer uninitializing the malgo context to prevent leaks if errors occur.

---

517-517: Explicit device pointer assignment.
Ensures the correct capture device is used according to the previously validated captureSource.

---

524-525: Preparing capture device reference.
No issues with storing the device pointer here for later use.

---

545-545: Audio level data improvement.
Including the device’s friendly name helps with debugging and monitoring.

---

573-573: Potential multiple restart concern.
If onStopDevice is triggered concurrently, consider guarding this logic to avoid repeated restarts.

---

578-583: Fallback restart mechanism.
Allowing a full context restart after a delay can gracefully recover from unexpected device errors.

---

608-608: Starting device capture.
Straightforward approach to bring the device to a running state.

---

613-613: Ensured capture device stop.
Deferring the stop call handles proper shutdown in case of errors.

---

619-619: Informative log output.
Displaying both device name and ID improves clarity for end-users.

internal/analysis/realtime.go (9)

99-100: Deferred addition of the “malgo” source.
Ensures the app can still run if the device’s initialization later fails.

---

106-109: Resilient error handling for buffer initialization.
Logging errors instead of aborting entirely allows partial sources to function.

---

361-363: Channel-based shutdown signal.
Creating monitorDone fosters a more organized shutdown sequence.

---

438-438: Graceful monitor closure.
Closing monitorDone ensures the monitor’s goroutine can complete promptly.

---

445-445: Ensuring the control monitor shut down.
Blocking here on <-monitorDone prevents premature returns.

---

450-451: Aggregating initialization errors.
Centralizing errors improves user feedback when multiple buffers fail.

---

454-454: Capturing analysis buffer failure.
Adds robustness by continuing other initializations despite partial errors.

---

458-461: Appending capture buffer errors.
Maintaining consistency with analysis buffer error handling.

---

462-463: Collective error reporting.
Returning a combined error message aids in quicker troubleshooting.

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