From cb5a8eab7eba3ba498590cc7872af75bb0da5a52 Mon Sep 17 00:00:00 2001
From: Geraint Luff <geraint@signalsmith-audio.co.uk>
Date: Tue, 5 Aug 2025 07:59:59 +0100
Subject: [PATCH] Zero `.exact()` output when it's too short

---
 signalsmith-stretch.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/signalsmith-stretch.h b/signalsmith-stretch.h
index 542a003..1ef9716 100644
--- a/signalsmith-stretch.h
+++ b/signalsmith-stretch.h
@@ -405,7 +405,16 @@ struct SignalsmithStretch {
 
 	template<class Inputs, class Outputs>
 	bool exact(Inputs &&inputs, int inputSamples, Outputs &&outputs, int outputSamples) {
-		if (outputSamples < outputLatency()*2) return false; // too short for this
+		if (outputSamples < outputLatency()*2) {
+			// to short for this - zero the output just to be polite
+			for (int c = 0; c < channels; ++c) {
+				auto &&channel = outputs[c];
+				for (int i = 0; i < outputSamples; ++i) {
+					channel[i] = 0;
+				}
+			}
+			return false;
+		}
 
 		struct ZeroPaddedInput {
 			Inputs &inputs;