gramps
5889d71db6
Unit 9, the one that matters most for this creator. MASTER STRIP (top, nearest the preview): - one ladder fed by the MEASURED mix — `AudioMixer` now measures the buffer the encoder receives (`MasterLevel`, `MasterImbalanceDb`), so the master cannot show a source instead of the output - `-12.4 dB` readout, and ONE L/R flag that appears above a 6 dB gap instead of a second ladder - bitrate / FPS / dropped / duration from the existing health poll MONO OUTPUT: - `AudioFold.ToMono` averages each stereo pair into both channels, applied after the limiter and the sync delay, so the stream AND the recording get what was folded - `MonoOutput` is persisted (`Audio.MonoOutput`) and restored at startup: an accessibility switch that resets each session is an accessibility failure - one click in the strip, remembered forever Guard: AudioFoldTests (hard-left reaches the right at half amplitude, hard-right — the inaudible case — reaches the left, centred material keeps its level, mono buffers untouched) and MasterStripTests (the strip binds the measured mix + the switch, the store round-trips it, and the fold is the tested helper rather than new arithmetic). 33 audio tests green.
28 lines
1.2 KiB
C#
28 lines
1.2 KiB
C#
using System;
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namespace ytLive.Helpers;
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/// <summary>The accessible mono fold: average each stereo pair into both channels.
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///
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/// <para>Creator context (2026-10-30): profoundly deaf on the right. Hard-panned content is not
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/// quieter to them, it is ABSENT, so a single-sided game or clip is unusable. Folding to mono puts
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/// everything on both sides — the loudness cost is honest (a one-sided signal arrives at half
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/// amplitude) and speech is unaffected because the mic is already centred.</para></summary>
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public static class AudioFold
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{
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/// <summary>Folds an interleaved buffer in place. Mono buffers are left untouched: there is
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/// nothing to combine, and rewriting them would be a silent no-op that hides a caller's bug.</summary>
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public static void ToMono(Span<float> interleaved, int channels)
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{
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if (channels < 2) return;
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var frames = interleaved.Length / channels;
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for (var frame = 0; frame < frames; frame++)
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{
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var offset = frame * channels;
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var mono = (interleaved[offset] + interleaved[offset + 1]) * 0.5f;
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interleaved[offset] = mono;
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interleaved[offset + 1] = mono;
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}
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}
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}
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