Latency / Buffer Size Calculator

Inspectable records

Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Area

Audio, Music, Photography & Color

Tranche

tranche-4

Evidence ID

t4-025

Ledger rows

1

No ledger note is attached.

Review findings

The arithmetic is valid only under the explicit 0 ms I/O-overhead assumption. The instrument cannot be verified as fully specified until the overhead estimate and round-trip toggle behavior are defined. The honest label correctly indicates that driver and DAC hardware latency add-ons are excluded, but it should also disclose that the I/O overhead term is either omitted or an explicitly defined estimate.

Formula and scope findings

• The base formula bufferSize/sampleRate*1000 is correct for the duration of one buffer, assuming bufferSize is in samples and sampleRate is in samples per second (Hz).
• Multiplying by 2 is a reasonable simplified estimate for input-plus-output buffer latency, but it is not universally the complete round-trip latency formula because interface, driver, conversion, and scheduling delays may differ.
• The phrase '+ I/O overhead estimate' is incomplete: no overhead value, input, default, or calculation method is specified, so the stated formula cannot produce a unique output.
• The round-trip toggle semantics are not explicitly defined for whether the I/O overhead estimate is applied in one-way mode, round-trip mode, or both.

Unit assumptions

• bufferSize is a non-negative number of samples per buffer.
• sampleRate is a positive number of samples per second, expressed in Hz.
• 1000 converts seconds to milliseconds.
• The test calculations assume the unspecified I/O overhead estimate is 0 ms; this assumption must be made explicit before implementation.
• A round-trip estimate is modeled as two buffer durations: 2*bufferSize/sampleRate*1000.

Boundary hardening

BREAK_CLAIMED · SELF_FLAGGED

A sample rate of zero causes an undefined division and must be rejected. Additionally, the specification provides no numeric I/O overhead estimate, so exact total latency is underdetermined unless the implementation documents or supplies H; the outputs above therefore include the computable base latency and express the total as base plus H.

Errata and corrections

No applied erratum is attached to this unique-name record.

Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

{
  "inputs": {
    "bufferSize": 256,
    "sampleRate": 48000,
    "roundTrip": true
  },
  "expected_outputs": {
    "latencyMs": 10.666666667
  },
  "working": "One buffer: 256 / 48000 s = 0.005333333333 s. Convert: 0.005333333333 * 1000 = 5.333333333 ms. Round trip: 5.333333333 * 2 = 10.666666667 ms. I/O overhead assumed: 0 ms. Total = 10.666666667 ms."
}

Related workflows

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json · VERIFIED_CLEAN
• evidence-tranche4/tranche4-results.json
• BOUNDARY_HAZARD_CATALOG.json