Module latency_testing 

Tauri commands that expose latency measurement to the frontend.

Each command in this module is a thin adapter over AudioLatencyMeasurementService. They are responsible for:

• Locking (or releasing) the AudioService mutex at the right time.
• Logging results via tracing so they appear in the backend console.
• Returning serialisable DTOs across the IPC boundary.

Command overview

Command	Tauri invoke name	What it measures
test_gain_latency	test_gain_latency	Gain processor CPU cost (logs only, no return value)
measure_all_dsp_cpu_timings	measure_all_dsp_cpu_timings	CPU cost of all DSP processors
measure_all_dsp_algorithmic_latency	measure_all_dsp_algorithmic_latency	Algorithmic (design) delay per processor
measure_buffer_latency	measure_buffer_latency	I/O buffer delay from stream config
measure_round_trip_latency	measure_round_trip_latency	True end-to-end hardware round-trip

Functions

measure_all_dsp_algorithmic_latency

Returns the algorithmic (design-inherent) delay for every processor in the DSP chain.

measure_all_dsp_cpu_timings

Measures the CPU execution cost of every processor in the active DSP chain.

measure_buffer_latency

Estimates the I/O buffer latency from the current CPAL stream configuration.

measure_round_trip_latency

Measures true end-to-end round-trip latency using dedicated CPAL streams.

test_gain_latency

Measures the CPU execution impact of the GainProcessor and logs the result.