This PR enhances the Data Path test in OboeTester by adding two new analysis signals: a swept-sine (chirp) and a multi-tone signal. This provides a more comprehensive and robust way to test the audio data path, especially for input presets where OEMs might apply audio processing.

Problem

The existing sine wave test is not always sufficient. For some processed input presets (e.g., Camcorder), OEMs can apply effects like noise reduction that might filter out a simple, steady sine wave. This can lead to test failures that don't accurately reflect the device's ability to record real-world audio like music.

Solution

This PR introduces two new test signals that are more representative of complex audio and less likely to be misinterpreted as noise by audio processing algorithms:

• Swept-sine (Chirp): Tests the device's frequency response over a wide range of frequencies.
• Multi-tone: Tests for distortion and other non-linear effects by playing multiple frequencies at once.

Key Changes

• UI: Added a new UI element in the Data Path test to allow selecting the desired test signal (Sine, Chirp, or Multi-tone).
• Signal Generation: Implemented the generation of the chirp and multi-tone signals in the native code.
• FFT-based Analysis: Implemented a new analysis path based on FFT to analyze the recorded chirp and multi-tone signals.
  • For multi-tone, the analysis calculates the Signal-to-Noise and Distortion Ratio (SINAD).
  • For chirp, the analysis computes a spectrogram and verifies that the frequency sweep is recorded correctly.
• Pass/Fail Criteria: Added pass/fail criteria for the new analysis modes to allow for automated testing.
• Code Quality: Refactored the new code to improve readability, maintainability, and remove magic numbers.