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Add chirp-bin watermark decoder

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This commit is contained in:
Meta Vens 2026-05-22 19:50:02 +01:00
commit d79bae17bb
8 changed files with 688 additions and 25 deletions
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40
src/Mimir.BufferSmoke/Program.cs
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@ -5,6 +5,11 @@ if (args.Any(arg => string.Equals(arg, "--chirplet-self-test", StringComparison.
return RunChirpletSelfTest();
}
if (args.Any(arg => string.Equals(arg, "--chirp-bin-self-test", StringComparison.OrdinalIgnoreCase)))
{
return RunChirpBinSelfTest();
}
if (args.Any(arg => string.Equals(arg, "--passive-sync-self-test", StringComparison.OrdinalIgnoreCase)))
{
return RunPassiveSyncSelfTest();
@ -162,6 +167,41 @@ static int RunChirpletSelfTest()
return 0;
}
static int RunChirpBinSelfTest()
{
var timeline = MimirChirpBinTimeline.Default;
var samples = new List<float>();
for (ulong segment = 0; segment < 6; segment++)
{
samples.AddRange(timeline.RenderSegmentMonoFloat(segment));
}
var decode = timeline.DecodeStreamWindow(samples.ToArray(), MimirChirpBinTimeline.SampleRate);
var meanAbsoluteError = decode.ClockFit?.MeanAbsoluteErrorSamples ?? double.PositiveInfinity;
Console.WriteLine(
$"chirp-bin-self-test frames={decode.Frames.Count} symbols={decode.Symbols.Count} anchors={decode.Anchors.Count} " +
$"clock={(decode.ClockFit is null ? "none" : decode.ClockFit.EffectiveSampleRate.ToString("0.000000"))} " +
$"confidence={(decode.ClockFit?.Confidence ?? 0.0):0.000} mae={meanAbsoluteError:0.000000}");
Console.WriteLine("chirp-bin-expected " + string.Join(",", Enumerable.Range(0, 12).Select(index => timeline.EventForIndex((ulong)index).SymbolId)));
Console.WriteLine("chirp-bin-symbols " + string.Join(",", decode.Symbols.Take(12).Select(symbol => $"{symbol.SymbolId}@{symbol.SampleOffset:0}:{symbol.Energy:0.000}")));
foreach (var anchor in decode.Anchors.Take(16))
{
var expected = timeline.EventForIndex(anchor.EventIndex).StartSeconds * MimirChirpBinTimeline.SampleRate;
Console.WriteLine(
$"chirp-bin-anchor event={anchor.EventIndex} actual={anchor.SampleOffset:0.000} expected={expected:0.000} " +
$"error={anchor.SampleOffset - expected:0.000} confidence={anchor.Confidence:0.000}");
}
if (decode.ClockFit == null || decode.Anchors.Count < 16 || meanAbsoluteError > 2.0)
{
Console.Error.WriteLine("chirp-bin self-test failed: dechirp/bin decoder did not recover stable timeline anchors");
return 1;
}
return 0;
}
static int RunPassiveSyncSelfTest()
{
const int sampleRate = 48_000;