internal/

Package audiotest synthesises test signals: the conformance signals of EBU Tech 3341 (loudness meters, true peak) and Tech 3342 (loudness range) as their tables describe them, with the expected readings and tolerances of the specifications, and PCM streams with known defects.

Package colorimetry holds the colour science of ITU-R BT.2100 HDR signals shared by the light level analyzer and the HDR quality metrics: the PQ (SMPTE ST 2084) and HLG (ARIB STD-B67) transfer functions, the BT.2020 non-constant-luminance Y′CbCr matrix, the quantisation of code values and the ICtCp representation behind ΔE ITP (ITU-R BT.2124).

Package ffexec runs FFmpeg command-line tools and streams their output.

Package findings holds the rules that turn a report into noteworthy facts: the thresholds, the level of each fact, the time ranges and the rungs it concerns.

Package htmlreport renders analysis results as a single self-contained HTML page: inline SVG charts, style and script, no external resource.

Package linalg is the small dense linear algebra behind the ladder's regressions: systems of a handful of unknowns, where a dependency would cost more than the few loops here.

Package segments turns per-frame flags into time intervals.

Package stats provides small descriptive statistics helpers.

Package testutil provides helpers for tests that need real media files.

Package tui renders analysis reports and progress for terminals.